Engagement table assembly and wheeled moving device

Abstract

Providing an engagement platform assembly and a wheeled transfer device. [Solution] An engagement table assembly includes a seat plate assembly configured to receive an object and a locking mechanism including at least one locking member disposed on the seat plate assembly and slidable between a first locked position and a first unlocked position, wherein the locking member can lock the object when in the first locked position and can unlock the object when in the first unlocked position. A wheeled transportation device includes the above-mentioned engagement table assembly.

Description

[Technical Field]

[0001] This application is filed on November 8, 2022, with application number 2022113936156 and titled "Engagement table assembly and wheeled transport device comprising the engagement table assembly," a Chinese patent application filed on March 2, 2023, with application number 2023101934065 and titled "Wheeled transport device," and a Chinese patent application filed on May 10, 2023, with application number 2023105239766 and titled "Wheeled transport device, associated This application claims priority to Chinese patent applications entitled "Engagement table assembly, strap guide mechanism and carrier," filed on June 19, 2023, with application number 2023107301348, entitled "Support assembly and wheeled moving device," and filed on August 9, 2023, with application number 2023110021287, entitled "Support assembly and wheeled moving device," the entire contents of which are incorporated herein by reference. The present invention relates to an engagement table assembly and a wheeled moving device. [Background technology]

[0002] Generally, when users need to go out with an infant or animal, they can use a trolley to transport the infant or animal. However, these trolleys cannot be placed directly in a vehicle in an unfolded state and must be folded and stored in the vehicle (e.g., the trunk of the vehicle), and a separate carrier must be installed in the vehicle to carry the infant or animal. This requires users to prepare at least two types of carriers when going out, which is inconvenient. Furthermore, because the trolley seat structure is complicated, it takes up a large amount of space inside the vehicle even when folded.

[0003] In addition, while users can use hand-held carriers to carry infants or animals when going out, they must lift and move the carrier for long periods of time, which is very labor-intensive. Furthermore, even if a hand-held carrier is placed on a mobile device, the carrier may not be stably secured to the mobile device. When encountering uneven roads or slopes, the carrier may tilt or fall off the mobile device, posing a significant safety risk. Summary of the Invention

[0004] In one aspect, the present invention provides an engagement table assembly, the engagement table assembly including: a seat plate assembly configured to receive an object; and a locking mechanism including at least one locking member, the at least one locking member disposed on the seat plate assembly and slidable between a first locked position and a first unlocked position, the locking member being capable of locking the object when the locking member is in the first locked position, and the locking member being capable of unlocking the object when the locking member is in the first unlocked position.

[0005] Furthermore, the locking mechanism further includes at least one unlocking operation part attached to the seat plate assembly and connected to the locking member, the unlocking operation part being slidable between a second locked position and a second unlocked position, and when the unlocking operation part is in the second locked position, the locking member is in the first locked position, and when the unlocking operation part is operated and moved from the second locked position to the second unlocked position, the locking member moves to the first unlocked position in accordance with the movement of the unlocking operation part.

[0006] Furthermore, a second driving inclined surface is provided on the unlocking operation unit and / or the locking member, the unlocking operation unit and the locking member are operably connected by the second driving inclined surface, and the movement direction of the unlocking operation unit is perpendicular to the movement direction of the locking member.

[0007] Furthermore, the locking member has an extension portion, the extension portion has an inclined hole, the second driving inclined surface is provided on the wall of the inclined hole, and the unlocking operation portion has a driving pin attached thereto that cooperates slidably with the inclined hole.

[0008] Furthermore, the locking mechanism includes two first locking members, the two first locking members being connected by a linkage device, and when one of the first locking members receives a force and moves to the first unlocked position, the linkage device drives the other first locking member to move toward the first unlocked position in synchronization.

[0009] Furthermore, the two first locking members are provided on the same side of the seat plate assembly, and the two first locking members move along the same direction to switch to the first locked position or the first unlocked position, or the two first locking members move along opposite directions to switch to the first locked position or the first unlocked position, and the engagement base assembly further includes at least one elastic device that applies a force to the first locking member to move it to the first locked position.

[0010] Furthermore, the linkage device includes a linkage assembly connected between the two first locking members, and when either of the first locking members receives a force and moves between the first unlocked position and the first locked position, the linkage device drives the other first locking member to move between the first unlocked position and the first locked position in synchronization.

[0011] Furthermore, the linkage assembly includes a fixed connection point located between the two first locking members and two pivot shafts located on either side of the fixed connection point, the linkage assembly is pivotally connected to the two first locking members via the two pivot shafts, and when either of the first locking members moves, the two pivot shafts move in opposite directions, thereby synchronously moving the two first locking members along directions opposite to each other.

[0012] Further, the linkage assembly includes a first link rod, a second link rod, a third link rod, and a fourth link rod, the first link rod, the second link rod, the third link rod, and the fourth link rod are connected two by two to form four connection points, one of the four connection points is a fixed connection point, and the fixed connection point is fixed to the seat plate assembly, and one of the four connection points opposite the fixed connection point is a central connection point, and two of the first link rod, the second link rod, the third link rod, and the fourth link rod connected to the central connection point are respectively connected to the two first locking members, and a line connecting the fixed connection point and the central connection point is perpendicular to the movement direction of the two first locking members.

[0013] Furthermore, the locking mechanism includes two second locking members, which are provided on the other side of the seat plate assembly and are parallel to the two first locking members, and which have the same configuration as the two first locking members.

[0014] Furthermore, the locking mechanism includes two second locking members, which are provided on the other side of the seat plate assembly and are parallel to the two first locking members, and the two first locking members and the two second locking members are connected by the linkage device, and the linkage device allows the two first locking members and the two second locking members to move synchronously to the first unlocked position.

[0015] Furthermore, the locking mechanism includes at least one first locking member and at least one second locking member, a moving direction of the at least one first locking member is parallel to a moving direction of the at least one second locking member, and the first locking member and the second locking member, which are diagonally opposite to each other, are connected by a linkage device, and the linkage device allows the first locking member and the second locking member, which are connected to each other, to move in opposite directions and be synchronously switched to the first unlocked position.

[0016] Further, the linkage device includes a linkage member that is a link rod or a traction member, and the first and second locking members that are diagonally positioned are connected by the linkage member, and / or the engagement base assembly further includes at least one elastic device that applies a force to the first locking member and / or the second locking member to move them to the first locking position.

[0017] Furthermore, the locking mechanism includes two first locking members and two second locking members, and the two first locking members and the two second locking members are connected by the two linkage members.

[0018] Furthermore, the two linkage members are link rods, and the two linkage members are arranged to cross each other.

[0019] Further, the two linkage members are pivotally connected at their intersection point, and / or the connection points between the two linkage members and the two second locking members define an angle with respect to the intersection point of the two linkage members, the angle decreasing as the locking members move from the first locked position towards the first unlocked position.

[0020] Furthermore, the engagement platform assembly further includes two support frames for supporting the seat plate assembly, the two support frames being provided on both the left and right sides of the seat plate assembly, respectively, and each support frame including a longitudinal rod, a connecting rod and a shock absorbing rod connected to form a triangular structure.

[0021] Furthermore, the vertical rod is installed below the seat plate assembly and fixedly connected to the seat plate assembly, a first end of the connecting rod is connected to a first end of the vertical rod, a second end of the connecting rod is connected to a first end of the shock absorbing rod, and a second end of the shock absorbing rod is connected to the vertical rod, and the shock absorbing rod has elasticity to provide cushioning support to the seat plate assembly.

[0022] Further, the engaging platform assembly is attached to a foldable frame, and each of the support frames further includes a first connecting member and a second connecting member, a first end of the first connecting member and a first end of the second connecting member each pivotally attached to a second end of the connecting rod, and the second end of the first connecting member, the second end of the second connecting member and the first end of the connecting rod each pivotally connected to different rods of the frame that are foldable relative to each other.

[0023] Furthermore, a first connecting rod is connected between the longitudinal rods of the two support frames, and / or a second connecting rod is connected between the connecting rods of the two support frames.

[0024] Further, the longitudinal rod includes a position limiting finger, the position limiting finger being provided at a first end of the longitudinal rod, which abuts against the connecting rod to limit the angle at which the longitudinal rod pivots downward relative to the connecting rod, and / or the longitudinal rod includes a position limiting protrusion, the position limiting protrusion being provided at a first end of the longitudinal rod, which abuts against the connecting rod to limit the angle at which the longitudinal rod pivots upward relative to the connecting rod.

[0025] Furthermore, the support frame further includes a position limiting member, a first end of the position limiting member slidably connected to the longitudinal rod, and a second end of the position limiting member pivotally attached to the connecting rod.

[0026] Further, the engagement base assembly further includes a retention mechanism that retains the locking member in the first unlocked position, the retention mechanism including: a touch button provided on the sheet plate assembly and movable vertically relative to the sheet plate assembly to allow at least a portion of the touch button to protrude upward relative to the sheet plate assembly; a buckle portion connected to the touch button; and a reset member provided between the touch button and the sheet plate assembly and driving the touch button to move upward so that the touch button protrudes upward relative to the sheet plate assembly, wherein when the object is placed on the sheet plate assembly, the touch button moves downward due to pressure from the object, and the buckle portion moves downward along with the touch button; and when the locking member moves from the first locked position to the first unlocked position, a retention hook of the locking member engages with the buckle portion, and the locking member is retained in the first unlocked position.

[0027] Furthermore, the buckle portion is movable vertically relative to the touch button, and the holding mechanism further includes an elastic member provided between the touch button and the buckle portion, and the elastic member drives the buckle portion to move downward relative to the touch button.

[0028] Further, the engagement platform assembly includes at least one engagement passage that engages with at least one engagement member of the object, and when the locking member is in the first locking position, the locking member extends into the corresponding engagement passage to lock the corresponding engagement member, and when the locking member is in the first unlocking position, the locking member retracts relative to the engagement passage to allow the engagement member to be removed from the engagement passage.

[0029] Additionally, the engagement base assembly further includes a retention mechanism that retains the locking member in the first unlocked position.

[0030] Furthermore, the holding mechanism includes a movable member attached to a slide passage communicating with the engagement passage, the movable member having an abutment end that protrudes into the engagement passage and an engagement end that moves away from the abutment end, and a reset device that drives the abutment end to protrude into the engagement passage, and when the engagement passage engages with the engagement member, the abutment end is pushed by the engagement member and retracts from the engagement passage, and when the locking member moves to the first unlocked position, the engagement end engages with the locking member, locking the locking member in the first unlocked position.

[0031] Furthermore, a first buckle portion is provided at the engagement end, and a second buckle portion is provided at the locking member, and when the engagement member engages with the engagement passage, the first buckle portion moves to the movement path of the second buckle portion, and when the locking member moves to the first unlocked position, the second buckle portion engages with the first buckle portion.

[0032] Furthermore, the locking member is provided with an elastic arm, the second buckle portion is provided on the elastic arm, and / or one of the first buckle portion and the second buckle portion is an engagement groove, and the other is a wedge-shaped step.

[0033] Furthermore, the locking member is integrally formed with the elastic arm, or the elastic arm is fixed to the locking member by a fastener, and a rotation prevention structure is provided between the elastic member and the locking member.

[0034] The reset device further includes a pull wire, a first reset member, and a sliding member, the pull wire being connected between the movable member and the sliding member, the first reset member contacting the sliding member and driving the sliding member to reset, and when the sliding member is reset, the pull wire drives the contact end to protrude into the engagement passage.

[0035] Furthermore, the sliding member has an engagement indication area that indicates the position of the movable member, the sliding member is attached to a hollow rod, and the rod is provided with an observation hole through which the engagement indication area can be observed.

[0036] Furthermore, the movable member has a connection portion located outside the slide passage, the traction wire is supported by a guide bracket located outside the slide passage and connected to the connection portion, and the movement direction of the traction wire located between the connection portion and the guide bracket is parallel to the slide passage.

[0037] Furthermore, the locking member has an alignment portion, and the movable member has a position limiting portion located outside the slide path, and when the engaging member is disengaged from the engaging path, the reset device drives the movable member to move, and moves the position limiting portion onto the movement path of the locking member and abuts against the alignment portion, thereby holding the locking member in the first unlocked position, and when the engagement path is engaged with the engaging member, the position limiting portion moves out of the movement path of the locking member to allow the locking member to move to the first locked position.

[0038] Further, the engagement base assembly is mounted to a frame, and at least one unlocking operation unit is mounted to the frame, the at least one unlocking operation unit is operably connected to the at least one locking member, and the at least one unlocking operation unit drives the at least one locking member to move to the first unlocked position.

[0039] Furthermore, the at least one unlocking operation portion has an unlocking identification area that indicates that the at least one locking member is in the first locked position or the first unlocked position.

[0040] Furthermore, the frame includes at least one wheel mounting portion for mounting a front wheel or a rear wheel, and the at least one unlocking operation portion is slidably cooperated with the at least one wheel mounting portion, and the unlocking operation portion is connected to the at least one locking member via at least one towing rope.

[0041] Furthermore, the frame is provided with at least one guide mechanism for guiding the at least one towing rope, and the at least one guide mechanism includes at least one rotating member provided adjacent to the at least one unlocking operation portion.

[0042] Furthermore, the unlocking operation unit has a first driving inclined surface, which is inclined with respect to the sliding direction of the unlocking operation unit, and the end of the towing rope abuts against the first driving inclined surface so as to be able to slide along the first driving inclined surface.

[0043] Furthermore, the unlocking operation unit includes a first position limiting wall, a first engagement structure is formed between the first position limiting wall and the first driving inclined surface, a second position limiting wall is provided within the wheel mounting portion, a second engagement structure is formed on the second position limiting wall, the first driving inclined surface is between the first position limiting wall and the second position limiting wall, and an end of the towing rope is installed to engage with the first engagement structure or the second engagement structure.

[0044] Furthermore, a first inclined guide surface is provided on the wheel mounting portion, an angle is formed between the first inclined guide surface and the first inclined drive surface, and the end of the traction rope abuts against the first inclined drive surface and the first inclined guide surface within the angle range.

[0045] Furthermore, the locking mechanism includes at least two locking members, the at least two locking members are connected by a linkage device, and the linkage device allows the at least two locking members to move synchronously to the first unlocked position; the frame is equipped with an unlocked state synchronization mechanism and at least two unlocking operation units, and the at least two unlocking operation units are connected to the at least two locking members, respectively; and the unlocked state synchronization mechanism allows the at least two unlocking operation units to simultaneously enter a state in which they unlock the at least two locking members.

[0046] Furthermore, the at least two unlocking operation units are respectively connected to the at least two locking members via at least two towing ropes, the frame includes at least two wheel mounting portions for mounting front wheels or rear wheels, and the at least two unlocking operation units are slidably mounted to the at least two wheel mounting portions.

[0047] Furthermore, each of the at least two unlocking operation units has a first driving inclined surface, which is inclined with respect to the sliding direction of the unlocking operation unit, and each of the at least two unlocking operation units abuts against the ends of the at least two towing ropes via the first driving inclined surface, and the unlocked state synchronization mechanism includes at least two second reset members, each of which abuts against the corresponding end of the towing rope and drives the end of the towing rope away from the first driving inclined surface to slide the corresponding unlocking operation unit downward.

[0048] Further, the sheet plate assembly includes a first sheet plate assembly and a second sheet plate assembly, the locking mechanism includes a first locking mechanism and a second locking mechanism, the first locking mechanism is provided on the first sheet plate assembly and the second locking mechanism is provided on the second sheet plate assembly, the first locking mechanism and the second locking mechanism both include the at least one locking member, the first sheet plate assembly and the second sheet plate assembly are rotatable relative to each other about a rotation axis so that the engaging base assembly is in an unfolded state and a folded state, and when the engaging base assembly is in the unfolded state, the engaging base assembly supports the object and the at least one locking member locks the object.

[0049] Further, the seat plate assembly is attached to a foldable connection assembly, the connection assembly including the rotation axis, the unfolded state of the connection assembly corresponds to the unfolded state of the engagement base assembly, and the folded state of the connection assembly corresponds to the folded state of the engagement base assembly.

[0050] Furthermore, the connection assembly includes a first coupling member to which the first seat plate assembly is attached and an auxiliary support member to which the second seat plate assembly is attached, the first coupling member and the auxiliary support member being pivotally connected via a pivot shaft, and a center line of the pivot shaft forming the rotation axis.

[0051] Further, the first connecting member includes two first tubes arranged in parallel, the auxiliary support member includes two second tubes arranged in parallel, each of the first tubes pivotally connected to an adjacent second tube by the pivot shaft, the first sheet plate assembly is connected between the two first tubes and extends along a first direction, the second sheet plate assembly is connected between the two second tubes and extends along the first direction, and when the connection assembly is in the expanded state, the first sheet plate assembly and the second sheet plate assembly are spaced apart in a second direction, and the first direction and the second direction are not parallel.

[0052] Furthermore, when the connection assembly is in the unfolded state, the angle between adjacent first and second tubes is approximately 180 degrees, and when the connection assembly is in the folded state, the angle between adjacent first and second tubes is an acute angle, and / or the first seat plate assembly is close to the pivot shaft and the second seat plate assembly is far from the pivot shaft, and the first and second seat plate assemblies are misaligned when the connection assembly is in the folded state.

[0053] Furthermore, sleeves are provided on both ends of the first seat plate assembly, each sleeve is fitted onto the corresponding first tube, and the pivot shaft is drilled through the sleeve.

[0054] Further, the first seat plate assembly has at least one first engagement channel, each of the first engagement channels extending in a second direction, the first locking mechanism has at least one first locking member, each of the first locking members moving in a first direction to switch between the first locked position and the first unlocked position, in the first locked position, the first locking member protruding into the corresponding first engagement channel, and in the first unlocked position, the first locking member retracting from the corresponding first engagement channel, The assembly has at least one second engagement passage, each of the second engagement passages extending in the second direction, the second locking mechanism has at least one second locking member, each of the second locking members moving in the first direction to switch between the first locked position and the first unlocked position, in the first locked position the second locking member protrudes into the corresponding second engagement passage, and in the first unlocked position the second locking member retracts from the corresponding second engagement passage, and the first direction and the second direction are not parallel.

[0055] Further, the first locking mechanism includes two first locking members connected by a first linkage assembly, which controls the two first locking members to move synchronously so that the two first locking members switch between the first locked position and the first unlocked position in a synchronous manner; and / or the second locking mechanism includes two second locking members connected by a second linkage assembly, which controls the two second locking members to move synchronously so that the two second locking members switch between the first locked position and the first unlocked position in a synchronous manner.

[0056] Furthermore, the at least one first locking member and the at least one second locking member are connected by at least one linkage member, and the first locking member and the second locking member connected to the same linkage member are switched synchronously between the first locked position and the first unlocked position, and the first locking member and the second locking member connected to the same linkage member move in opposite directions.

[0057] Furthermore, the first seat plate assembly is connected to a first pivot base, the second seat plate assembly is connected to a second pivot base, the first pivot base and the second pivot base are pivotally connected to form the rotation axis, and the movement direction of the first locking member, the movement direction of the second locking member, and the rotation axis are parallel to each other.

[0058] Furthermore, the first seat plate assembly is attached to a first support frame, the first support frame is connected to the first pivot base, the second seat plate assembly is attached to a second support frame, the second support frame is connected to the second pivot base, the first pivot base and the second pivot base are connected to a mounting base portion, and the mounting base portion is detachably connected to the frame.

[0059] In another aspect, the present invention further provides a wheeled transportation device including a frame and the above-described engagement platform assembly.

[0060] Furthermore, a storage rack is installed on the frame, the storage rack having at least one storage cavity, and at least one clamping part is installed at an opening of the at least one storage cavity, the clamping part being made of an elastic material.

[0061] In another aspect, the present invention further provides a wheeled transportation device including a frame and a connection assembly, wherein the frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and an upper support rod connected to a handlebar, wherein an upper end of the front support rod, an upper end of the rear support rod, and a lower end of the upper support rod are pivotally connected by pivot portions, and the connection assembly is pivotally connected to the frame, and the connection assembly folds when the frame is folded.

[0062] The connection assembly further includes: a first connecting member having a front end pivotally connected to a first pivot point of the front support rod; an auxiliary support member having a front end pivotally connected to a second pivot point of the first connecting member and a third pivot point of the rear support rod; and a linkage member having an upper end pivotally connected to a fourth pivot point of the upper support rod and a lower end pivotally connected to a fifth pivot point of the auxiliary support member, wherein when the frame is in an unfolded state, the first connecting member and the auxiliary support member are unfolded, and the second pivot point is located between the first pivot point and the third pivot point and the fifth pivot point is located between the second pivot point and the third pivot point, and when the frame is in a folded state, the first connecting member and the auxiliary support member are folded.

[0063] Furthermore, when the frame is unfolded, the first connecting member and the auxiliary support member are arranged horizontally, and the second pivot point, the third pivot point and the fifth pivot point are essentially in a straight line.

[0064] Furthermore, the connection assembly further includes a sheet plate support member connected to the auxiliary support member and movable in synchronization with the auxiliary support member, and the sheet plate support member mounts an engagement platform assembly that engages with the carrier.

[0065] Furthermore, the seat plate support member is provided inside the auxiliary support member, and the rear end of the first connecting member is located between the seat plate support member and the auxiliary support member, and / or the engagement base assembly is attached to the seat plate support member, and the engagement base assembly includes a plurality of engagement points.

[0066] Additionally, an engagement platform assembly including a plurality of engagement points is attached to the auxiliary support member.

[0067] Furthermore, the linkage member has a generally S-shaped structure having a first segment, a second segment, and a third segment in sequence.

[0068] Further, an engagement base assembly is attached to the connection assembly, the engagement base assembly including a seat plate assembly configured to receive and support a carrier, the seat plate assembly including a first extension portion and / or a second extension portion, the first extension portion extending rearward from the seat plate assembly and the second extension portion extending forward from the seat plate assembly.

[0069] Further, an engagement base assembly including a plurality of engagement points is attached to the connection assembly, and when the frame is folded, the front support rod, the rear support rod, and the upper support rod are brought closer to each other, and the connection assembly pivots the engagement base assembly, so that the front end of the engagement base assembly pivots downward and the rear end of the engagement base assembly pivots upward.

[0070] Further, an engagement base assembly is attached to the connection assembly, and the engagement base assembly includes a seat plate assembly configured to receive a carrier and a locking mechanism including at least one locking member, the at least one locking member being provided on the seat plate assembly and slidable between a first locked position and a first unlocked position, and when the locking member is in the first locked position, the locking member can lock the carrier, and when the locking member is in the first unlocked position, the locking member can unlock the carrier.

[0071] In another aspect, the present invention further provides a wheeled transportation device including a frame and an engagement base assembly, wherein the frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and an upper support rod connected to a handlebar, wherein the upper end of the front support rod, the upper end of the rear support rod, and the lower end of the upper support rod are pivotally connected by pivot portions, the engagement base assembly is attached to the frame, supports and locks a carrier, and when the frame is unfolded, the center of gravity of the engagement base assembly is offset toward the rear wheel relative to the pivot portion.

[0072] Furthermore, when the frame is in the deployed state, the center of gravity of the platform assembly is adjacent to or in a plane formed by the rear support rods.

[0073] Furthermore, when the frame is in the deployed state, the engagement platform assembly is lower than the pivot portion.

[0074] In another aspect, the present invention further provides a wheeled transportation device including a frame and an engagement base assembly attached to the frame and extending along a left-right direction, the engagement base assembly including a seat plate assembly configured to receive a carrier and a locking mechanism including at least one locking member that locks the carrier, the frame including a first crossbar and / or a second crossbar extending along the left-right direction, the first crossbar being located a predetermined distance in front of the engagement base assembly and supporting the carrier in cooperation with the engagement base assembly, and the second crossbar being located a predetermined distance behind the engagement base assembly and supporting the carrier in cooperation with the engagement base assembly.

[0075] Further, the frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and a connection assembly respectively connected to the front support rod and the rear support rod, wherein the front support rod includes the first crossbar, and / or the connection assembly includes the second crossbar, and / or the position of the second crossbar in the fore-and-aft direction is adjustable.

[0076] Further, the front support rod is pivotally connected to the rear support rod, the frame is foldable, the connection assembly includes a first connecting member and an auxiliary support member, the first connecting member is pivotally connected to a first pivot point of the front support rod, the second pivot point of the first connecting member is pivotally connected to the auxiliary support member, and the auxiliary support member is pivotally connected to a third pivot point of the rear support rod, when the frame is in an unfolded state, the first connecting member and the auxiliary support member are unfolded and the second pivot point is located between the first pivot point and the third pivot point, when the frame is in a folded state, the first connecting member and the auxiliary support member are folded, the engagement base assembly is connected to the first connecting member or the auxiliary support member, and the auxiliary support member includes the second crossbar.

[0077] Furthermore, the engaging base assembly has a sleeve fitted to the first connecting member or the auxiliary support member, and the pivot shaft of the second pivot point is drilled through the sleeve.

[0078] Furthermore, the frame further includes an upper support rod, the lower end of which is pivotally connected to the upper end of the front support rod and the upper end of the rear support rod, and the upper end of which is connected to the handlebar; the connection assembly further includes a linkage member, the upper end of which is connected to the upper support rod, and the lower end of which is connected to the auxiliary support member.

[0079] Further, the first crossbar is provided with a first groove portion or a first positioning protrusion, and / or the second crossbar is provided with a second groove portion or a second positioning protrusion, and / or the engaging base assembly is provided with a third groove portion or a third positioning protrusion.

[0080] Furthermore, a first abutment member that abuts against the carrier is attached to the first cross bar, and / or a second abutment member that abuts against the carrier is attached to the second cross bar.

[0081] Furthermore, the engagement base assembly includes at least one engagement passage extending in the front-to-rear direction, the at least one engagement passage being arranged in a row spaced apart from each other in the left-to-right direction, the at least one locking member being slidable along the left-to-right direction, and the at least one locking member having a first locking position in which it protrudes into the at least one engagement passage to lock the carrier, and a first unlocking position in which it retracts from the at least one engagement passage to unlock the carrier.

[0082] Further, the frame includes at least one wheel mounting portion for mounting a front wheel or a rear wheel, at least one unlocking operation portion slidably cooperates with the at least one wheel mounting portion, the at least one unlocking operation portion is connected to the at least one locking member via at least one towing rope and drives the at least one locking member to move to an unlocked position, the at least one unlocking operation portion has an unlocking identification area, and the unlocking identification area indicates that the at least one locking member is in the locked position or the unlocked position.

[0083] Furthermore, the engagement base assembly further includes at least one retention mechanism, and when the at least one locking member is driven to an unlocked position, the at least one retention mechanism locks the at least one locking member in the unlocked position.

[0084] The present invention also provides a wheeled transport device comprising: a frame; an engagement base assembly attached to the frame and configured to engage a carrier, the engagement base assembly including at least one locking member; and an indicator attached to the frame and / or the engagement base assembly for indicating an operating state of the wheeled transport device, the at least one locking member having a locking position for locking the carrier and an unlocking position for unlocking the carrier, the operating state including whether the engagement base assembly is engaged with the carrier and / or whether the at least one locking member locks the carrier.

[0085] Further, the engagement base assembly includes at least one engagement passage that engages with an engagement member of the carrier, and the indicator device includes a first indicator device that indicates whether the at least one engagement member is engaged in the at least one engagement passage.

[0086] Furthermore, the first indicating device includes a movable member attached to a slide passage communicating with the engagement passage and having an abutment end protruding into the engagement passage, and a sliding member operably connected to the movable member and having an engagement indication area, and when the engagement passage engages with the engagement member, the abutment end is pushed by the engagement member and retracts from the engagement passage, and the movable member drives the sliding member to slide, thereby changing the position of the engagement indication area.

[0087] Furthermore, the frame includes a hollow rod, the sliding member is slidable within the hollow rod, and the rod is provided with an observation hole for observing the engagement indication area, and the first indication device further includes a pull wire, and the pull wire is connected between the sliding member and the movable member.

[0088] Furthermore, the first indicating device further includes a first reset member, which abuts against the sliding member and drives the sliding member to reset, thereby driving the pull wire to protrude the abutment end into the engagement passage.

[0089] Furthermore, the movable member has a connection portion located outside the slide passage, the traction wire is supported by a guide bracket located outside the slide passage and connected to the connection portion, and the movement direction of the traction wire located between the connection portion and the guide bracket is parallel to the slide passage.

[0090] Furthermore, the movable member has an engagement end that is spaced from the abutment end, and when the engagement member is engaged in the engagement passage and the locking member moves to the unlocked position, the engagement end engages with the locking member to lock the locking member in the unlocked position.

[0091] Additionally, the indicator device includes a second indicator device for indicating whether the at least one locking member is in the locked position or the unlocked position.

[0092] Further, the second indicating device includes at least one unlocking operation unit, the at least one unlocking operation unit being operably connected to the at least one locking member, and the at least one unlocking operation unit having an unlocking identification area indicating a position of the at least one locking member.

[0093] Furthermore, the wheeled transport device further includes at least one holding mechanism, and when the at least one locking member is driven to the unlocked position, the at least one holding mechanism locks the at least one locking member in the unlocked position and holds the corresponding unlocking operating unit in the unlocked position of the locking member.

[0094] Further, the engagement base assembly includes a seat plate assembly configured to receive the carrier, the at least one locking member and the at least one unlocking operation portion are provided on the seat plate assembly, the at least one unlocking operation portion and / or the at least one locking member are provided with a second driving inclined surface, the at least one unlocking operation portion and the at least one locking member are operably connected by the second driving inclined surface, and the movement direction of the unlocking operation portion is perpendicular to the movement direction of the locking member.

[0095] Furthermore, the frame includes a wheel mounting portion for mounting a front wheel or a rear wheel, and the at least one unlocking operation portion is slidably mounted to the wheel mounting portion and connected to the at least one locking member via at least one towing rope.

[0096] Furthermore, the engagement base assembly includes at least two locking members connected by a linkage device, which allows the at least two locking members to move synchronously to the unlocked position; the wheeled moving device includes an unlocked state synchronization mechanism and at least two unlocking operating units, which are operably connected to the at least two locking members, respectively, and which, by the unlocked state synchronization mechanism, allow the at least two unlocking operating units to be in a state of unlocking the at least two locking members simultaneously.

[0097] Furthermore, the frame includes a wheel mounting portion for mounting a front wheel or a rear wheel, the at least one unlocking operation unit is slidably mounted on the wheel mounting portion and connected to the at least one locking member via at least one towing rope, the at least two unlocking operation units are operably connected to ends of the at least two towing ropes via first drive inclined surfaces, respectively, and the unlocked state synchronization mechanism includes at least two second reset members, each of which abuts against an end of a corresponding towing rope and pushes the end of the towing rope away from the first drive inclined surface.

[0098] In another aspect, the present invention provides a wheeled transportation device including: a frame including at least two wheel mounting portions for mounting front or rear wheels; a seat plate assembly configured to receive a carrier; an engagement base assembly including: a locking mechanism provided on the seat plate assembly and including at least two locking members slidable between a locked position and an unlocked position; and a linkage device connected to the at least two locking members and causing the at least two locking members to move synchronously to the unlocked position; at least two unlocking operating portions slidably attached to the at least two wheel mounting portions, respectively, and connected to the at least two locking members via at least two tow ropes, respectively; and an unlocking state synchronization mechanism by which the at least two unlocking operating portions can simultaneously be in a state to unlock the at least two locking members, wherein the locking members can lock the carrier when in the locked position and can unlock the carrier when in the unlocked position.

[0099] Furthermore, the at least two locking members are connected by a linkage device, and when any of the locking members receives a force and moves to the unlocked position, the linkage device drives the other locking member to move synchronously toward the unlocked position.

[0100] Furthermore, the locking mechanism includes two locking members, and the linkage device includes a linkage assembly connected between the two locking members, and the linkage assembly causes the two locking members to move synchronously along opposite directions.

[0101] Furthermore, the at least two unlocking operating units each have a first drive inclined surface, and the at least two unlocking operating units are operably connected to ends of the at least two towing ropes via the first drive inclined surface, and the unlocked state synchronization mechanism includes at least two second reset members, each of which abuts against a corresponding end of the towing rope to push the end of the towing rope away from the first drive inclined surface.

[0102] Furthermore, a first guide inclined surface is provided on the wheel mounting portion, an angle is formed between the first guide inclined surface and the first driving inclined surface, and the end of the traction rope abuts against the first driving inclined surface and the first guide inclined surface within the angle range.

[0103] Furthermore, the wheeled transport device further includes a holding mechanism, and when the locking member is driven to the unlocked position, the holding mechanism locks the locking member in the unlocked position and holds the unlocking operating unit in a second unlocked position that unlocks the locking member.

[0104] In another aspect, the present invention further provides a support frame for supporting a seat plate assembly, the support frame including a longitudinal rod, a connecting rod, and a shock absorbing rod connected to form a triangular structure, wherein the longitudinal rod is installed below the seat plate assembly and fixedly connected to the seat plate assembly, a first end of the connecting rod is connected to a first end of the longitudinal rod, a second end of the connecting rod is connected to a first end of the shock absorbing rod, and a second end of the shock absorbing rod is connected to the longitudinal rod, and the shock absorbing rod has elasticity to provide cushioning support to the seat plate assembly.

[0105] Furthermore, the support frame further includes a first connecting member and a second connecting member, a first end of the first connecting member and a first end of the second connecting member are each pivotally connected to a second end of the connecting rod, and the second end of the first connecting member, the second end of the second connecting member and the first end of the connecting rod are each pivotally connected to different rods of the frame that are folded relative to each other.

[0106] Furthermore, two support frames are arranged, one on each of the left and right sides of the seat plate assembly, and a first connecting rod is connected between the vertical rods of the two support frames, and / or a second connecting rod is connected between the connecting rods of the two support frames.

[0107] Further, the longitudinal rod includes a position limiting finger, the position limiting finger being provided at a first end of the longitudinal rod, and the position limiting finger abuts against the connecting rod to limit the angle of downward pivoting of the longitudinal rod relative to the connecting rod.

[0108] Furthermore, the longitudinal rod includes a position limiting protrusion, the position limiting protrusion being provided at a first end of the longitudinal rod, and the position limiting protrusion abuts against the connecting rod to limit the angle at which the longitudinal rod pivots upward relative to the connecting rod.

[0109] Furthermore, the support frame further includes a position limiting member, a first end of the position limiting member slidably connected to the longitudinal rod, and a second end of the position limiting member pivotally attached to the connecting rod.

[0110] In another aspect, the present invention further provides a locking mechanism, the locking mechanism including: two first locking members that move along opposite directions to move to a locked position or an unlocked position; and a linkage assembly including a fixed connection point located between the two first locking members and two pivot shafts located on either side of the fixed connection point, the linkage assembly being pivotally connected to the two first locking members via the two pivot shafts, and the linkage assembly being arranged such that movement of either of the first locking members causes the two pivot shafts to move in opposite directions, thereby synchronously moving the two first locking members along opposite directions.

[0111] Additionally, the linkage assembly includes a four-bar linkage.

[0112] The linkage assembly further includes a first link rod, a second link rod, a third link rod, and a fourth link rod, wherein the first link rod, the second link rod, the third link rod, and the fourth link rod are connected two by two to form four connection points, one of the four connection points is a fixed connection point, and the connection point of the four connection points opposite the fixed connection point is a central connection point, and two of the first link rod, the second link rod, the third link rod, and the fourth link rod connected to the central connection point are respectively connected to the two first locking members, and a line connecting the fixed connection point and the central connection point is perpendicular to the movement direction of the two first locking members.

[0113] Furthermore, the locking mechanism includes two second locking members, the two second locking members being parallel to the two first locking members, and the first locking members and the second locking members diagonally positioned among the two first locking members and the two second locking members being connected by a linkage member.

[0114] Furthermore, the linkage member is a link rod or a traction member.

[0115] Furthermore, the linkage members are link rods, and the two first locking members and the two second locking members are connected by the two link rods, and the two link rods are pivotally connected at their intersections.

[0116] In still another aspect, the present invention further provides a retention mechanism for retaining a locking member slidable between a locked position and an unlocked position at the unlocked position, the locking member being attached to a seat plate assembly, the retention mechanism including: a movable member attached to a slide passage of the seat plate assembly and having an abutment end and an engagement end separated from the abutment end; and a reset device for driving the abutment end to move in a direction away from the engagement end, the abutment end being capable of being pressed by a carrier placed on the seat plate assembly, the locking member locking the carrier, when the carrier is locked by the locking member, the abutment end being pressed by the carrier and moving in a direction toward the engagement end, and when the locking member moves to the unlocked position, the engagement end engages with the locking member to lock the locking member in the unlocked position.

[0117] Furthermore, a first buckle portion is provided at the engagement end, and a second buckle portion is provided at the locking member, and the second buckle portion engages with the first buckle portion to lock the locking member in the unlocked position.

[0118] Furthermore, the locking member is provided with an elastic arm, and the second buckle portion is provided on the elastic arm, and / or one of the first buckle portion and the second buckle portion is an engagement groove, and the other is a wedge-shaped step.

[0119] Furthermore, the locking member has an alignment portion, and the movable member has a position limiting portion located outside the slide passage, and when the carrier releases its pressure on the movable member, the reset device drives the movable member to move, moving the position limiting portion onto the movement path of the locking member and abutting it against the alignment portion, thereby holding the locking member in the first unlocked position.

[0120] Furthermore, when the carrier presses the abutting end of the movable member downward, the position limiting portion moves out of the movement path of the locking member to allow the locking member to move to the lock position.

[0121] Furthermore, the locking member has a recess, and the matching portion is formed on a wall of the recess.

[0122] In order to more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the drawings necessary for describing the embodiments or the prior art will be briefly described. The drawings described below are only shown in the embodiments of the present invention, and it is clear that those skilled in the art can obtain drawings of other embodiments based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0123] [Figure 1] 1 is a perspective view schematically illustrating a wheeled transportation device according to an embodiment of the present invention. [Figure 2] 1 is a top perspective view schematically illustrating a wheeled transportation device according to an embodiment of the present invention. [Figure 3] 1 is a perspective view of a wheeled transport device according to an embodiment of the present invention, showing a schematic view of the connection between the carrier bracket device and the locking mechanism with the carrier box removed. FIG. [Figure 4] FIG. 10 is a top perspective view of a wheeled transportation device according to one embodiment of the present invention, with the carrier box removed and showing the connection between the carrier bracket device and the locking mechanism. [Figure 5] FIG. 1 is a diagram schematically illustrating a frame according to an embodiment of the present invention. [Figure 6] 1 is a perspective view schematically illustrating an engagement table assembly according to an embodiment of the present invention. [Figure 7] FIG. 2 is a side view schematically illustrating an engagement table assembly according to one embodiment of the present invention. [Figure 8] 7 is a schematic cross-sectional view of the engagement table assembly according to the embodiment of the present invention taken along the line B1-B1 in FIG. 6. FIG. [Figure 9] 1A and 1B are diagrams illustrating a support structure according to an embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view schematically showing a support structure according to another embodiment of the present invention. [Figure 11] FIG. 10 is a plan view schematically showing a support structure according to another embodiment of the present invention. [Figure 12] 1 is a perspective view schematically showing a frame to which an engagement table assembly according to an embodiment of the present invention is attached; [Figure 13] 1 is a perspective view schematically showing a frame to which an engagement table assembly according to an embodiment of the present invention is attached; [Figure 14] 1 is a side view schematically showing a frame to which an engagement table assembly according to an embodiment of the present invention is attached. FIG. [Figure 15] 1 is a diagram illustrating a frame to which a support structure according to an embodiment of the present invention is attached; [Figure 16] 1 is a perspective view of a frame having an attached engaging platform assembly according to one embodiment of the present invention, the frame being folded; FIG. [Figure 17] 1 is a side view of a frame with an attached engaging platform assembly according to one embodiment of the present invention being folded; FIG. [Figure 18] 1 is a front view showing a frame having an engagement table assembly according to an embodiment of the present invention attached thereto in a fully folded state; FIG. [Figure 19] 1 is a side view showing a frame having an engagement table assembly according to an embodiment of the present invention attached thereto in a fully folded state; FIG. [Figure 20]1 is a perspective view showing a locking mechanism of an engagement table assembly according to an embodiment of the present invention, with the upper housing of the seat plate assembly removed; FIG. [Figure 21] 1 is a perspective view schematically illustrating an engagement table assembly according to an embodiment of the present invention. [Figure 22] 22 is a schematic cross-sectional view of a locking mechanism according to an eleventh embodiment of the present invention, taken along the line B2-B2 in FIG. 21. [Figure 23] 1A and 1B are diagrams illustrating a locking mechanism according to an embodiment of the present invention. [Figure 24] 10 is a diagram showing a wheeled transport device according to an embodiment of the present invention, with the carrier box removed, and schematically illustrating the connection between the carrier bracket device and the locking mechanism. FIG. [Figure 25] 1 is a diagram showing a schematic diagram of a locking mechanism and a carrier placed thereon according to an embodiment of the present invention; [Figure 26] 1 is a diagram showing a schematic diagram of a locking mechanism and a carrier placed thereon according to an embodiment of the present invention; [Figure 27] 10 is a diagram showing a schematic view of a locking mechanism of an engagement table assembly according to another embodiment of the present invention, with the upper housing of the seat plate assembly removed. FIG. [Figure 28] 10A and 10B are diagrams illustrating an engagement table assembly according to another embodiment of the present invention. [Figure 29] 1 is a schematic view of an engagement table assembly provided with a holding mechanism according to one embodiment of the present invention, with the upper housing of the seat plate assembly removed; FIG. [Figure 30] FIG. 30 is a cross-sectional view schematically showing the holding mechanism taken along line B3-B3 in FIG. 29, showing the cross section of the sheet plate assembly to illustrate the structural relationship between the holding mechanism and the sheet plate assembly. [Figure 31] 1 is a cross-sectional view showing a schematic view of a holding mechanism according to an embodiment of the present invention, in which a carrier is placed above a seat plate assembly. [Figure 32]1 is a cross-sectional view showing a schematic view of a holding mechanism according to an embodiment of the present invention, in which a carrier is placed above a seat plate assembly. [Figure 33] FIG. 2 is a cross-sectional view schematically illustrating a holding mechanism according to an embodiment of the present invention. [Figure 34] 1 is a perspective view showing a wheeled transportation device according to an embodiment of the present invention; [Figure 35] FIG. 2 is a perspective view showing a frame according to an embodiment of the present invention. [Figure 36] FIG. 36 is a perspective view showing another angle of the frame shown in FIG. [Figure 37] FIG. 2 is a perspective view of an engagement table assembly according to an embodiment of the present invention. [Figure 38] 38 is a schematic perspective view of the engagement table assembly shown in FIG. 37 after the seat plate assembly has been removed. FIG. [Figure 39] 36 is a schematic perspective view showing the frame shown in FIG. 35 and a seat plate support member attached to the frame. FIG. [Figure 40] 40 is a schematic perspective view showing another angle of the frame and the seat plate support member shown in FIG. 39. FIG. [Figure 41] 1 is a schematic perspective view showing a frame and an engagement table assembly attached to the frame according to an embodiment of the present invention; [Figure 42] 42 is a perspective schematic view showing the frame and engagement base assembly shown in FIG. 41 from another angle. FIG. [Figure 43] FIG. 35 is a side view showing the wheeled transportation device shown in FIG. 34. [Figure 44] FIG. 44 is a front view of the wheeled transportation device shown in FIG. 43 after the carrier has been removed. [Figure 45] FIG. 42 is a side view of the frame and engagement base assembly shown in FIG. 41. [Figure 46] FIG. 46 is a side view of the frame and engagement platform assembly shown in FIG. 45 during folding. [Figure 47] FIG. 46 is a side view of the frame and clip unit shown in FIG. 45 after they have been fully folded. [Figure 48]FIG. 48 is a front view of the frame and engagement base assembly shown in FIG. 47. [Figure 49] 1 is a perspective view schematically illustrating a wheeled transportation device according to an embodiment of the present invention. [Figure 50] FIG. 50 is a perspective view schematically showing the frame and engagement base assembly of FIG. 49. [Figure 51] FIG. 51 is a top view schematically showing the frame and engagement base assembly shown in FIG. 50. [Figure 52] 51 is a side view schematically showing the frame and engagement table assembly shown in FIG. 50 in a state between the unfolded state and the folded state. FIG. [Figure 53] 51 is a side view schematically showing the frame and engagement table assembly shown in FIG. 50 in a folded state. FIG. [Figure 54] FIG. 52 is a cross-sectional view taken along C1-C1 in FIG. 51, showing the engagement table assembly with the carrier locked by the locking mechanism. [Figure 55] 51 is a bottom perspective view schematically illustrating the engagement base assembly of FIG. 50, with the lower housing omitted. FIG. [Figure 56] FIG. 51 is a top perspective view schematically showing the engagement base assembly of FIG. 50, with the upper housing omitted. [Figure 57] FIG. 51 is a perspective view showing the engagement base assembly of FIG. 50, with the upper and lower housings omitted. [Figure 58] FIG. 52 is a cross-sectional view taken along C1-C1 in FIG. 51, showing the engagement table assembly with the locking member locked by the retention mechanism. [Figure 59] FIG. 52 is a cross-sectional view taken along C1-C1 in FIG. 51, showing the engagement table assembly with the locking member and the holding mechanism separated from each other. [Figure 60] FIG. 50 is a partial cross-sectional view taken along the line C2-C2 of FIG. 49. [Figure 61] This is a partial cross-sectional view taken along line C3-C3 in Figure 51. [Figure 62] 58 is a side view schematically showing the locking member and linkage member of the engagement base assembly of FIG. 57, with the locking member in a locked position. [Figure 63]58 is a side view schematically showing the locking member and linkage member of the engagement base assembly of FIG. 57, with the locking member in an unlocked position. [Figure 64] FIG. 50 is a perspective view schematically showing a modification of the storage rack attached to the handlebar of FIG. 49. [Figure 65] FIG. 65 is a plan view of the handlebar and storage rack shown in FIG. 64. [Figure 66] FIG. 65 is an exploded view schematically showing the storage rack of FIG. 64. [Figure 67] 1 is a perspective view showing a wheeled transportation device according to an embodiment of the present invention, the wheeled transportation device including a support assembly disclosed in the embodiment of the present invention; [Figure 68] FIG. 68 is a perspective view schematically showing the frame and engagement base assembly shown in FIG. 67. [Figure 69] FIG. 69 is a plan view schematically showing some components of the frame and the engagement base assembly shown in FIG. 68. [Figure 70] FIG. 69 is a side view schematically showing the frame and engagement base assembly shown in FIG. 68. [Figure 71] 69 is a side view schematically showing the frame and engagement table assembly shown in FIG. 68 in a state between the unfolded state and the folded state. FIG. [Figure 72] FIG. 69 is a side view schematically showing the frame and engagement table assembly shown in FIG. 68 in a folded state. [Figure 73] FIG. 69 is a perspective view schematically showing the frame and engagement table assembly shown in FIG. 68 in a folded state. [Figure 74] FIG. 69 is a perspective view schematically showing the first seat plate assembly shown in FIG. 68, with the upper housing omitted and each first locking member in a locked position. [Figure 75] FIG. 69 is a bottom perspective view schematically showing some parts of the frame and internal parts of the first sheet plate assembly shown in FIG. 68. [Figure 76] 75 is a schematic diagram illustrating the structure of the first locking members and linkage members of FIG. 74, each of the first locking members being in an unlocked position. [Figure 77] FIG. 69 is a perspective view schematically showing the second sheet plate assembly shown in FIG. 68, with the upper housing omitted. [Figure 78] 69, the lower housing of the second seat plate assembly is omitted, and each second locking member is in a locked position. [Figure 79] 69 is a cross-sectional view schematically showing the frame and the engagement table assembly shown in FIG. 68, in a state in which the unlocking operation portion has not unlocked the locking member. FIG. [Figure 80] 69 is a cross-sectional view schematically showing the frame and engagement table assembly shown in FIG. 68, in which the unlocking operation portion is unlocking the locking member. FIG. [Figure 81] 69, showing the first locking member in the locked position and the engagement member of the carrier not entering the first engagement passage. FIG. [Figure 82] 69, in which the first locking member is in the locking position and the movable member of the holding mechanism is pressed by the engaging member of the carrier. [Figure 83] FIG. 69 is a bottom perspective view schematically showing some components of the first seat plate assembly and the holding mechanism shown in FIG. 68, in which the first buckle portion has moved onto the movement path of the second buckle portion. [Figure 84] This is a cross-sectional view taken along line U3-U3 in Figure 83. [Figure 85] 69 is a bottom perspective view schematically showing some components of the first seat plate assembly and the retention mechanism shown in FIG. 68, with the first buckle portion and the second buckle portion engaged. FIG. [Figure 86] 69 is a bottom perspective view schematically showing some components of the first seat plate assembly and the holding mechanism shown in FIG. 68, in which the first buckle portion is disengaged from the movement path of the second buckle portion. FIG. [Figure 87] FIG. 69 is yet another side view schematically showing the frame and engagement base assembly shown in FIG. 68. [Figure 88] FIG. 69 is yet another perspective view schematically showing the frame and engagement base assembly shown in FIG. 68. [Figure 89] 1 is a perspective view showing a wheeled transport device according to an embodiment of the present invention, the wheeled transport device having a support assembly according to another embodiment of the present invention; [Figure 90] FIG. 89 is a perspective view showing a frame and an engagement base assembly shown in FIG. [Figure 91] 91 is a bottom perspective view schematically showing some parts of the frame and internal parts of the first seat plate assembly shown in FIG. 90, with each first locking member in a locked position. FIG. [Figure 92] 91 is a bottom perspective view schematically showing some components of the frame and internal components of the first seat plate assembly shown in FIG. 90, with each first locking member in an unlocked position. FIG. [Figure 93] FIG. 93 is a partially enlarged view schematically illustrating the state in which the first locking member shown in FIG. 92 is locked in the unlocked position by the holding mechanism, in which the position limiting portion of the holding mechanism abuts against the alignment portion of the first locking member. [Figure 94] This is a cross-sectional view taken along line U6-U6 in Figure 90, in which the first locking member is in the locked position, the engagement member of the carrier enters the first engagement passage, and the position limiting portion of the holding mechanism and the alignment portion of the first locking member are separated. [Figure 95] FIG. 91 is a bottom perspective view schematically showing some components of the frame and internal components of the first seat plate assembly shown in FIG. 90, with the first locking member in the locked position, the engagement member of the carrier entering the first engagement passage, and the position limiting portion of the holding mechanism and the alignment portion of the first locking member separated. [Figure 96] FIG. 96 is a partial enlarged view schematically showing some components of FIG. 95, in which the first locking member is in the unlocked position, the position limiting portion of the retention mechanism and the matching portion of the first locking member are separated, and the engagement member of the carrier is prepared to be released from the first engagement passage. [Figure 97] This is a cross-sectional view taken along line U6-U6 in Figure 90, in which the engagement member of the carrier disengages from the first engagement passage, the position limiting portion of the holding mechanism abuts against the matching portion of the first locking member, and the first locking member is locked in the unlocked position. [Figure 98] This is a bottom perspective view schematically showing some parts of the frame shown in Figure 90 and internal parts of the first seat plate assembly, in which the engagement member of the carrier disengages from the first engagement passage, the position limiting portion of the holding mechanism abuts against the alignment portion of the first locking member, and the first locking member is locked in the unlocked position. [Figure 99] 91 is a cross-sectional view schematically showing the frame shown in FIG. 90 in a state where the unlocking operation portion has not unlocked the locking member. FIG. [Figure 100] 10 is a perspective view schematically illustrating a state in which two unlocking operation units are not simultaneously unlocking the locking member. FIG. [Figure 101] 91 is a cross-sectional view schematically showing the frame shown in FIG. 90, in which the unlocking operation portion has unlocked the locking member. FIG. [Figure 102] 10 is a perspective view schematically showing a state in which two unlocking operation units simultaneously unlock the locking member. FIG. [Figure 103] 1 is a perspective view showing a wheeled transport device according to an embodiment of the present invention, the wheeled transport device having a support assembly according to another embodiment of the present invention; [Figure 104] FIG. 104 is a perspective view showing a schematic view of the frame and support assembly shown in FIG. 103. [Figure 105] 105 is a side view schematically showing the frame and support assembly shown in FIG. 104 in a folded state. [Figure 106] FIG. 105 is a perspective view schematically showing the support assembly shown in FIG. 104. [Figure 107] 107 is a perspective view showing a schematic view of some components of the support assembly shown in FIG. 106, with the upper housings of the first and second sheet plate assemblies omitted. FIG. [Figure 108] FIG. 107 is an exploded view schematically illustrating the support assembly shown in FIG. 106. [Figure 109] 107 is an exploded view schematically showing the first pivot base and the lock release portion in FIG. 106. FIG. [Figure 110]FIG. 107 is a perspective view schematically showing the cover body and the lock release part of FIG. [Figure 111] FIG. 107 is another perspective view schematically illustrating the support assembly shown in FIG. 106. [Figure 112] 107 is a cross-sectional view taken along line U4-U4 of FIG. 106, showing the support assembly in an unfolded state. [Figure 113] FIG. 113 is a diagram schematically illustrating the support assembly shown in FIG. 112 in a folded state. [Figure 114] 108 is an exploded view schematically showing the unlocking operation portion and the first locking member shown in FIG. 107. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0124] The technical solutions in the embodiments of the present application will be described below clearly and completely in conjunction with the drawings in the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and do not represent all of the embodiments. Other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present application without requiring creative efforts also fall within the scope of protection of the present application.

[0125] The present invention will be described in detail below with reference to the drawings.

[0126] <First Example> 1 and 2, a wheeled transportation device 1000 according to an embodiment of the present invention is shown schematically. Fig. 1 is a perspective view of the wheeled transportation device 1000 according to this embodiment, and Fig. 2 is a top perspective view of the wheeled transportation device 1000.

[0127] As shown in FIG. 1 , the wheeled transportation device 1000 of this embodiment includes a frame 100, an engagement table assembly 200, and a carrier 300. The frame 100 has a configuration similar to that of a trolley, and the specific configuration will be described later. The engagement table assembly 200 is attached to the frame 100 and can lock and unlock an object to be locked (hereinafter collectively referred to as "object") to stably place the object, thereby improving safety during movement of the object. In addition, a user can easily attach and detach an object to and from the frame 100 by operating the engagement table assembly 200.

[0128] 1, the object may be a carrier 300. The carrier 300 is not limited to a box-shaped structure. The carrier 300 is for placing a baby or an animal (e.g., a pet) and can be attached to the frame 100 via an engaging platform assembly 200.

[0129] As shown in FIG. 2, carrier 300 includes a handle 330 and a container 340. Handle 330 is used for lifting carrier 300, and container 340 is used for placing an infant or animal. When carrier 300 is attached to engagement base assembly 200, a longitudinal centerline M1-M1 of carrier 300 is on substantially the same vertical plane as a longitudinal centerline M2-M2 of engagement base assembly 200. That is, carrier 300 is generally disposed symmetrically with respect to longitudinal centerline M2-M2 of engagement base assembly 200. Note that the "longitudinal centerline" is a centerline perpendicular to a connecting line located at the connection positions between both ends of handle 330 and carrier 300. The direction indicated by "F2" in FIG. 2 (i.e., longitudinal direction F2, also referred to as the front-rear direction or second direction) is a direction extending parallel to the longitudinal direction of longitudinal centerlines M1-M1 and M2-M2.

[0130] In an embodiment, as shown in FIG. 2, the lateral centerline M3-M3 of carrier 300 is on approximately the same vertical plane as the lateral centerline M4-M4 of engagement base assembly 200. In this case, carrier 300 is generally centered relative to engagement base assembly 200. Note that the "lateral centerline" is a centerline parallel to a connecting line located at the connection position between both ends of handle 330 and carrier 300. The direction indicated by "F1" in FIG. 2 (i.e., lateral direction F1, also referred to as the left-right direction or first direction) is a direction extending parallel to the lateral direction of lateral centerlines M3-M3 and M4-M4. In an embodiment, the connecting line between the two ends of handle 330 is parallel to and on the same vertical plane as lateral centerline M3-M3 of carrier 300 so that carrier 300 can be balanced when a user carries carrier 300.

[0131] Unless otherwise specified, in each embodiment of the present invention, directional terms such as "front," "rear," "left," and "right" related to the wheeled transportation device 1000 and frame 100 are based on the "front," "rear," "left," and "right" directions of the wheeled transportation device 1000 and frame 100 during normal travel, and in the drawings, arrows B and P schematically indicate the "front" and "rear" directions, and arrows L and R schematically indicate the "left" and "right" directions. These directional terms are used to clarify the explanation of the embodiments of the present invention and are not intended to unduly limit the scope of the claims of the present invention.

[0132] Referring to Figures 3 and 4, Figure 3 is an oblique view of the wheeled transport device 1000 after the box body 340 of the carrier 300 has been removed, and Figure 4 is an oblique top view of the wheeled transport device 1000 after the box body 340 has been removed.

[0133] 3 and 4 , the carrier 300 further includes a bracket device 310, which includes a first bracket 3111, a second bracket 3112, and a third bracket 3113, where the first bracket 3111 is located above the third bracket 3113 and the second bracket 3112 is connected between the first bracket 3111 and the third bracket 3113. The bracket device 310 surrounds a space that accommodates the box 340. The handle 330 is connected to the first bracket 3111. The carrier 300 includes an engagement member 311, and more specifically, the third bracket 3113 of the bracket device 310 includes the engagement member 311. In this embodiment, the engagement member 311 is an annular structural member (e.g., a substantially rectangular annular structure), although the structure of the engagement member 311 is not limited thereto. When the carrier 300 is attached to the engagement base assembly 200 , the engagement members 311 engage with the engagement base assembly 200 , and the carrier 300 is firmly attached to the frame 100 via the engagement base assembly 200 .

[0134] 4, the engagement base assembly 200 provides multiple engagement points, with one engagement point shown here in a partially enlarged view. When the carrier 300 is attached to the engagement base assembly 200, the engagement members 311 engage with the engagement base assembly 200 at each engagement point. In the embodiment, the engagement base assembly 200 provides, for example, four engagement points symmetrically distributed about the longitudinal centerline M1-M1 of the carrier 300 (which is also the longitudinal centerline M2-M2 of the engagement base assembly 200) and symmetrically distributed about the lateral centerline M3-M3 of the carrier 300 (which is also the lateral centerline M4-M4 of the engagement base assembly 200). In the embodiment, these four engagement points are symmetrically disposed on the engagement base assembly 200.

[0135] As a result, in this embodiment of the present invention, the carrier 300 is positioned symmetrically on the engaging base assembly 200, so that the carrier 300 can be stably attached to the engaging base assembly 200 and the frame 100. By rationally setting the positions of the above-mentioned multiple engagement points of the engaging base assembly 200, the user can easily place the carrier 300 symmetrically on the frame 100, and the carrier 300 is also at an appropriate position on the frame 100 in the front-to-rear direction. In this way, the frame 100 can provide stable support for the carrier 300, improving the overall stability of the wheeled transportation device 1000, and maintaining balance during the wheeled transportation device 1000's travel, while providing excellent impact resistance and safety.

[0136] As shown in FIG. 5, a frame 100 according to some embodiments of the present invention is shown schematically.

[0137] 5, the frame 100 of this embodiment includes a front support rod 11, a rear support rod 12, an upper support rod 13, a handlebar 14, and a wheel set 19. The wheel set 19 includes a front wheel 191 and a rear wheel 192, which are connected to the front support rod 11 and the rear support rod 12, respectively.

[0138] In this embodiment, the front support rod 11 has a U-shaped structure and includes two bars 111 located on both the left and right sides and a first crossbar 101 connected between the two bars 111. The rear support rod 12 may include two parallel bars 121 and a rear crossbar 122 connected between the two bars 121. The upper ends of the bars 111 of the front support rod 11 are pivotally connected to the upper ends of the bars 121 of the rear support rod 12. At least one front wheel 191 is connected to the lower side of the front support rod 11. The lower ends of the two bars 121 of the rear support rod 12 are respectively connected to corresponding rear wheels 192. As shown in FIG. 5 , in this embodiment, two front wheels 191 are provided, which are symmetrical and pivotally mounted on the front support rod 11. As an example, both of the two front wheels 191 are swivel wheels. The two rear wheels 192 are rotatably connected to the two bars 121 of the rear support rod 12, respectively, and are capable of rolling in the front-to-rear direction of the frame 100.

[0139] Although several embodiments of the present invention have been described above, the present invention is not limited to these configurations and numbers. For example, in other embodiments, the rear support rod 12 may have a U-shaped structure and connect two rear wheels 192. Preferably, the front support rod 11 may have a V-shaped or I-shaped structure, or may be provided with only one front wheel 191. Note that the front wheel 191 may be a unidirectional wheel, or the rear wheel 192 may be a swivel wheel.

[0140] In this embodiment, the distance between the two front wheels 191 is smaller than the distance between the two rear wheels 192 in order to improve the stability of the frame 100 and make it easier to steer.

[0141] 6 to 8, an engagement table assembly 200 according to an embodiment of the present invention is shown schematically. Specifically, Fig. 6 is a perspective view of the engagement table assembly 200, Fig. 7 is a side view of the engagement table assembly 200, and Fig. 8 is a cross-sectional view taken along section line B1-B1 in Fig. 6.

[0142] 6, the engagement platform assembly 200 includes a seat plate assembly (also called a seat plate) 2, a locking mechanism, and a support structure 240. Here, the seat plate assembly 2 includes an upper housing and a lower housing, and the locking mechanism is provided within the seat plate assembly 2. In FIG. 6, the locking mechanism is shielded by the upper housing of the seat plate assembly 2, and the specific structure of the locking mechanism will be described below.

[0143] In an embodiment, the support structure 240 may include two support frames 241, which may be provided on both the left and right sides of the seat plate assembly 2 (only one support frame 241 is shown in FIG. 6, with the other support frame 241 being shielded by the seat plate assembly 2). For example, the two support frames 241 are provided symmetrically on both sides of the seat plate assembly 2 with respect to a longitudinal centerline M5-M5 of the seat plate assembly 2. Note that the longitudinal centerline M5-M5 extends in the longitudinal direction F2 shown in FIG. 6.

[0144] 7 and 8, each support frame 241 includes a longitudinal rod 2411, a connecting rod 2412, and a shock absorbing rod 2413, which are connected to each other to form a triangular structure. The longitudinal rod 2411 is disposed below the seat plate assembly 2 and is fixedly connected to the seat plate assembly 2 (e.g., the lower housing of the seat plate assembly 2). A first end 2412a of the connecting rod 2412 is pivotally connected to a first end 2411a of the longitudinal rod 2411 (shown in FIG. 7), and a second end 2412b of the connecting rod 2412 is connected to a first end 2413a of the shock absorbing rod 2413. A second end 2413b of the shock absorbing rod 2413 is connected to a second end 2411b of the longitudinal rod 2411. For example, the connection position between the shock absorbing rod 2413 and the vertical rod 2411 corresponds to the middle and rear of the vertical direction of the seat plate assembly 2. In the embodiment, the shock absorbing rod 2413 has elasticity and provides shock-absorbing support to the seat plate assembly 2. For example, the shock absorbing rod 2413 can be a compression spring, a torsion spring, a cylinder, or other elastic structure.

[0145] The triangular structure of the support frame 241 allows the engaging table assembly 200 to be stably installed on the frame 100 (not shown in Figures 6 to 8, but for the specific installation method, please refer to the explanations of Figures 12 to 15), and by providing the shock absorbing rod 2413, when the frame 100 receives a bump, the object attached to the seat plate assembly 2 can be cushioned to a certain extent.

[0146] In this embodiment, the upper end of the shock absorbing rod 2413 is connected to the second end 2411b of the vertical rod 2411 (corresponding to the rear end of the seat plate assembly 2), and the shock absorbing rod 2413 has a suitable shock absorbing stroke and provides a suitable shock absorbing effect. However, the present invention is not limited to this. In another embodiment, the length of the vertical rod 2411 can be adjusted to adjust the relative positional relationship between the connection position of the shock absorbing rod 2413 and the vertical rod 2411 and the seat plate assembly 2, thereby adjusting the shock absorbing capacity of the support frame 241. For example, the connection position of the shock absorbing rod 2413 and the vertical rod 2411 corresponds to the center position or the rear end of the seat plate assembly 2. Of course, in the embodiment, the buffering capacity of the support frame 241 can be adjusted by, for example, ensuring that the angle between the connecting rod 2412 and the longitudinal rod 2411, the angle between the connecting rod 2412 and the shock absorbing rod 2413, and / or the angle between the shock absorbing rod 2413 and the longitudinal rod 2411 are within a predetermined range, and adjusting the length of the connecting rod 2412. In the embodiment, if the shock absorbing rod 2413 is a compression spring, the elastic coefficient of the shock absorbing rod 2413 can be adjusted to achieve a better shock absorbing effect. For example, the elastic coefficient of the shock absorbing rod 2413 can be changed by changing the parameters such as the pitch, diameter, and material of the compression spring. If the shock absorbing rod 2413 is an air cylinder, the pressure strength of the air cylinder can be changed to achieve a better shock absorbing effect.

[0147] 7 and 8, the longitudinal rod 2411 further includes a position limiting finger 2411c, which is provided at a first end 2411a of the longitudinal rod 2411 and protrudes (protrudes downward) toward the connecting rod 2412. The position limiting finger 2411c restricts the downward rotation angle of the longitudinal rod 2411 relative to the connecting rod 2412. When the wheeled transportation device 1000 travels on a bumpy road, the shock absorbing rod 2413 provides a buffering effect and is deformed (e.g., shortened or bent), causing the longitudinal rod 2411 to rotate downward relative to the connecting rod 2412. When the position limiting finger 2411c provided below the vertical rod 2411 abuts against the connecting rod 2412, the vertical rod 2411 does not pivot further downward (i.e., the angle between the vertical rod 2411 and the connecting rod 2412 does not become any smaller), preventing the vertical rod 2411 from being tilted at an excessively large angle relative to the horizontal plane, thereby preventing the seat plate assembly 2 and any object placed thereon from being tilted at an excessively large angle, improving safety and running stability.

[0148] 8, in the embodiment, the longitudinal rod 2411 further includes a position limiting protrusion 2411d, which is provided on the first end 2411a of the longitudinal rod 2411, and the position limiting protrusion 2411d and the position limiting finger 2411c are located, for example, on opposite sides of the first end 2411a of the longitudinal rod 2411. The position limiting protrusion 2411d, for example, protrudes upward. In the embodiment, the position limiting protrusion 2411d is located between the longitudinal rod 2411 and the upper housing of the seat plate assembly 2. The position limiting protrusion 2411d is for restricting the angle at which the longitudinal rod 2411 pivots upward relative to the connecting rod 2412. For example, as described above, when the wheeled transportation device 1000 travels on a bumpy road, the longitudinal rod 2411 pivots upward or downward relative to the connecting rod 2412 as the shock absorbing rod 2413 deforms or recovers from deformation. When the shock absorbing rod 2413 recovers from deformation, a force is applied to the longitudinal rod 2411 to cause the longitudinal rod 2411 to pivot upward. When the longitudinal rod 2411 pivots upward, the position limiting protrusion 2411 d can abut against a structure on the connecting rod 2412, preventing the longitudinal rod 2411 from rotating upward too much together with the seat plate assembly 2, thereby preventing the connection between the longitudinal rod 2411 and the connecting rod 2412 from breaking. Furthermore, after the seat plate assembly 2 and the frame 100 (not shown in Figure 8) are folded as a whole (for details, see the description of Figures 16 to 19 later), the user can lift up the entire frame structure by pulling up both the front and rear ends of the seat plate assembly 2. At this time, the position limiting protrusion 2411d can prevent the seat plate assembly 2 from flipping over due to the large force applied to the rear end of the seat plate assembly 2, further improving the safety of use and structural stability of the wheeled transportation device 1000.

[0149] FIG. 9 illustrates a schematic diagram of a support structure 240 according to some embodiments of the present invention.

[0150] In one embodiment, the support structure 240 further includes a crossbar- or U-shaped first connecting rod 242, which is connected between the longitudinal rods 2411 of the two support frames 241. For example, as shown in FIG. 9 , the first connecting rod 242 connects the second ends 2411b of the longitudinal rods 2411 of the two support frames 241. Preferably, the second ends 2411b of the longitudinal rods 2411 of the two support frames 241 are fitted into both ends of the first connecting rod 242, respectively. In another embodiment, the support structure 240 further includes a second connecting rod 243, which is connected between the connecting rods 2412 of the two support frames 241. In this embodiment, the first connecting rod 242 is connected to or integrally formed with the first ends 2411a of the two longitudinal rods 2411, respectively, and the second connecting rod 243 is connected to or integrally formed with the second ends 2411b of the two longitudinal rods 2411, respectively, and the first connecting rod 242, the two longitudinal rods 2411, and the second connecting rod 243 define a rectangular frame structure.

[0151] Figures 10 and 11 schematically illustrate a support structure 240 according to another embodiment of the present invention, where Figure 10 illustrates a perspective view of the support structure 240 and Figure 11 illustrates a plan view of the support structure 240 as viewed from the inside.

[0152] The support structure 240 shown in Fig. 10 has a similar structure to the support structure 240 shown in Fig. 9 and similarly includes two support frames 241, each of which includes a longitudinal rod 2411, a connecting rod 2412, and a shock absorbing rod 2413. The main difference between the support structure 240 shown in Fig. 10 and the support structure 240 shown in Fig. 9 is that the support frame 241 may include a position limiting member 2414.

[0153] 11 , a first end 2414a of the position limiting member 2414 is slidably connected to the vertical rod 2411, and a second end 2414b of the position limiting member 2414 is pivotally attached to a second end 2412b of the connecting rod 2412. In this embodiment, a position limiting groove 2414c is provided at the first end 2414a of the position limiting member 2414, and a pin 2411e is provided at a middle position of the vertical rod 2411. The position limiting member 2414 can slide vertically relative to the vertical rod 2411 through cooperation of the position limiting groove 2414c and the pin 2411e.

[0154] Preferably, when the support structure 240 is in the initial state shown in FIG. 11 , the pin 2411e is located at the uppermost end of the position limiting groove 2414c due to the supporting action of the shock absorbing rod 2413, and the angle between the vertical rod 2411 and the connecting rod 2412 reaches its maximum angle. At this time, the position limiting member 2414 is approximately perpendicular to the vertical rod 2411 (the position limiting member 2414 is, for example, parallel to the up-down direction D3 shown in FIG. 11 ). When the wheeled transportation device 1000 travels on an uneven road, the shock absorbing rod 2413 provides a buffering effect and is deformed (for example, shortened or bent), and the vertical rod 2411 pivots downward relative to the connecting rod 2412. At this time, the position limiting member 2414 swings around the connection point between its second end 2414b and the connecting rod 2412, and the pin 2411e of the vertical rod 2411 slides downward along the position limiting groove 2414c. The lower end of the position limiting groove 2414c restricts the downward sliding stroke of the pin 2411e of the vertical rod 2411, and restricts the rotation of the vertical rod 2411 relative to the connecting rod 2412 within a certain angle range. This prevents the vertical rod 2411 and the seat plate assembly 2 (not shown in FIG. 11, but see FIGS. 6 to 8) fixed thereto from being tilted downward at an excessively large angle relative to the connecting rod 2412, and prevents the vertical rod 2411 and the seat plate assembly 2 from being turned upside down (i.e., the angle between the vertical rod 2411 and the connecting rod 2412 from becoming larger than the maximum angle in the initial state) when a user lifts the seat plate assembly 2 to move the frame 100 in the folded state. In other words, the position limiting member 2414 can further limit the rotation of the longitudinal rod 2411, and the position limiting member 2414 can simultaneously function as both the position limiting finger 2411 c and the position limiting protrusion 2411 d. Of course, the present invention is not limited thereto. In other embodiments, the support structure 240 may only have the position limiting member 2414, and may not have the position limiting finger 2411 c and the position limiting protrusion 2411 d.

[0155] 12 to 14 schematically show a frame 100 to which an engagement base assembly 200 according to an embodiment of the present invention is attached, where Figs. 12 and 13 are perspective views of the frame 100 and the engagement base assembly 200 attached thereto, as viewed from different angles, and Fig. 14 is a side view of the frame 100 and the engagement base assembly 200.

[0156] 12 to 14, the engagement platform assembly 200 is attached to the frame 100 via its support structure 240. The frame 100 is foldable, and the engagement platform assembly 200 can be folded together with the frame 100. The engagement platform assembly 200 is fixedly attached to the support structure 240 by the seat plate assembly 2 and a locking mechanism (the locking mechanism is hidden in FIG. 12, and its specific structure will be described later), and the seat plate assembly 2 provides a substantially horizontal surface on which an object (in this embodiment, a carrier 300) can be placed. Referring to FIG. 15, the support structure 240 further includes a first connecting member 244 and a second connecting member 245, which are pivotally connected to the frame 100, respectively. By installing the first connecting member 244 and the second connecting member 245, the engagement platform assembly 200 is folded together with the frame 100 when the frame 100 is folded. The specific manner in which the support structure 240 is connected to the frame 100 and the mechanism by which the engagement platform assembly 200 is folded together with the frame 100 will be described later.

[0157] FIG. 15 schematically illustrates a frame 100 to which a support structure 240 according to an embodiment of the present invention is attached, with the frame 100 in an unfolded state. As shown in FIG. 15, one end of a first connecting member 244 and one end of a second connecting member 245 are each pivotally connected to a second end 2412b of a connecting rod 2412, and the other end of the first connecting member 244, the other end of the second connecting member 245, and a first end 2412a of the connecting rod 2412 are each pivotally connected to different bars in the frame 100. The support structure 240 is pivotally attached to the frame 100 by this connection between the first connecting member 244 and the second connecting member 245. When the frame 100 is in an unfolded state, the support structure 240 is in a position to support the engagement table assembly 200 (for clarity, structures of the engagement table assembly 200 other than the support structure 240 have been removed in FIG. 15). When the frame 100 is folded, the support structure 240 can rotate relative to the frame 100 and fold with the frame 100 .

[0158] 15 , in this embodiment, one end of the first connecting member 244 is pivotally connected to the second end 2412b of the connecting rod 2412, and the other end of the first connecting member 244 is pivotally connected to the upper support rod 13 of the frame 100. One end of the second connecting member 245 is pivotally connected to the second end 2412b of the connecting rod 2412, and the other end of the second connecting member 245 is pivotally connected to the rear support rod 12. The first end 2412a of the connecting rod 2412 is pivotally connected to the front support rod 11, thereby allowing the support frame 241, together with the entire engagement table assembly 200, to pivot in accordance with the pivoting of the frame 100, thereby achieving overall folding. Referring to FIG. 15 , in this embodiment, one end of the first connecting member 244, one end of the second connecting member 245, and the second end 2412b of the connecting rod 2412 are pivotally connected at a pivot point N1. The other end of the first connecting member 244 and the upper support rod 13 of the frame 100 are pivotally connected at pivot point N2. The other end of the second connecting member 245 and the rear support rod 12 are pivotally connected at pivot point N3. The first end 2412a of the connecting rod 2412 and the front support rod 11 are pivotally connected at pivot point N4.

[0159] 16 to 19, a folding process of the frame 100 to which the engaging base assembly 200 according to the embodiment of the present invention is attached is schematically shown. Here, Figs. 16 and 17 show a perspective view and a side view of the frame 100 and the engaging base assembly 200 during the folding process of the frame 100. Figs. 18 and 19 show a front view and a side view of the frame 100 and the engaging base assembly 200 after the frame 100 has been completely folded.

[0160] As shown in Fig. 16, the frame 100 of this embodiment can be folded for transportation and storage. Specifically, the handlebar 14 of the frame 100 is pivotally connected to the upper support rod 13 via a pivot portion 117 and is foldable relative to the upper support rod 13. The front support rod 11, the rear support rod 12, and the upper support rod 13 are pivotally attached to pivot portions (which may also be referred to as pivot points) 118 and are foldable relative to one another. Furthermore, when the frame 100 is folded, the support structure 240 can be pivoted at the same time, and the engagement platform assembly 200 attached to the support structure 240 can also pivot as the frame 100 is folded.

[0161] Referring to FIG. 17, the first connecting member 244 of the support structure 240 is pivotally connected to the upper support rod 13 of the frame 100 at pivot point N2, the second connecting member 245 and the rear support rod 12 are pivotally connected at pivot point N3, the connecting rod 2412 and the front support rod 11 are pivotally connected at pivot point N4, and the first connecting member 244, the second connecting member 245, and the connecting rod 2412 are pivotally connected at pivot point N1. Due to the above connection relationship, the first connecting member 244, the second connecting member 245, the upper support rod 13 and the rear support rod 12 form a four-bar linkage with the pivot portion 118 and pivot points N1, N2 and N3, the front support rod 11, the rear support rod 12, the second connecting member 245 and the connecting rod 2412 form a four-bar linkage with the pivot portion 118 and pivot points N1, N3 and N4, and the front support rod 11, the upper support rod 13, the first connecting member 244 and the connecting rod 2412 form a four-bar linkage with the pivot portion 118 and pivot points N1, N2 and N4, thereby allowing the engagement base assembly 200 to pivot as the frame 100 is folded, and thereby be stored within the overall structure of the frame 100 (the fully folded state of the frame 100 is shown in Figure 19).

[0162] 18 and 19, when the frame 100 is fully folded, the front support rod 11, rear support rod 12, upper support rod 13, and handlebar 14 are folded to their closest positions, with the rear support rod 12 positioned between the front support rod 11 and the upper support rod 13. The engagement base assembly 200 pivots relative to the frame 100 and is stored between the upper support rod 13 and the front support rod 11.

[0163] 18, the seat plate assembly 2 may also include a lifting handle 29. When the frame 100 and the engaging base assembly 200 are fully folded, the lifting handle 29 is located close to the top of the folded frame 100, allowing a user to easily grasp the lifting handle 29 and move the frame 100 and the engaging base assembly 200.

[0164] 20 and 21, there is shown a schematic diagram of an engagement base assembly 200 according to an embodiment of the present invention. 20 and 21 are perspective views of the engagement base assembly 200, and in FIG. 20, the upper housing of the seat plate assembly 2 has been removed to allow observation of the locking mechanism 21 located within the seat plate assembly 2.

[0165] 20 and 21, a locking mechanism 21 is mounted within the seat plate assembly 2 to lock and unlock an object (eg, a sleeping box) positioned on the seat plate assembly 2.

[0166] As shown in FIG. 20 , the locking mechanism 21 includes at least one unlocking operation portion 212 and at least one locking member 211. The unlocking operation portion 212 is provided on the sheet plate assembly 2 and is movable relative to the sheet plate assembly 2 between a locked state (also referred to as a second locked position) and an unlocked state (which may also be referred to as a second unlocked position). The locking member 211 moves with the movement of the unlocking operation portion 212 and can accordingly move between a locked position (also referred to as a first locked position) and an unlocked position (also referred to as a first unlocked position). In an embodiment, when the unlocking operation portion 212 is in the locked state shown in FIG. 21 , at least a portion of the unlocking operation portion 212 protrudes from the sheet plate assembly 2. When the unlocking operation portion 212 is in the locked state, the locking member 211 is in the locked position, and the locking member 211 locks an object placed on the sheet plate assembly 2. When the unlocking operation portion 212 is pressed to move from the locked state to the unlocked state, the locking member 211 moves to the unlocked position in accordance with the movement of the unlocking operation portion 212, and unlocks the object located on the seat plate assembly 2.

[0167] As shown in FIG. 20 , in an embodiment, the at least one locking member 211 may include a plurality of first locking members 211A, which may be connected by a linkage assembly 25. The linkage assembly 25 can synchronously move the plurality of first locking members 211A located on the same side (front, rear, left, or right) of the seat plate assembly 2. In this embodiment, the plurality of first locking members 211A are simultaneously located on the front side of the seat plate assembly 2, and the plurality of first locking members 211A may be referred to as front locking members. In this embodiment, the plurality of first locking members 211A can be synchronously moved in the same direction by a rigid connection (i.e., a fixed connection). Alternatively, in an embodiment, the plurality of first locking members 211A can be synchronously moved in opposite directions by being connected by a linkage assembly 25 as shown in FIG. 20 . In an embodiment, the at least one locking member 211 may further include a plurality of second locking members 211B, which are simultaneously located on the other side of the seat plate assembly 2 and face the plurality of first locking members 211A. In an embodiment, the plurality of second locking members 211B may be connected by another linkage assembly 25 so that the plurality of locking members 211 located on the other side of the seat plate assembly 2 can move synchronously. In this embodiment, the plurality of second locking members 211B are simultaneously located on the rear side of the seat plate assembly 2, and the plurality of second locking members 211B may be referred to as rear locking members. In an embodiment, the movement direction of the second locking member 211B is parallel to the movement direction of the first locking member 211A, or it can be said that the second locking member 211B is parallel to the movement direction of the first locking member 211A.

[0168] In another embodiment, the at least one locking member 211 may include at least one first locking member 211A and at least one second locking member 211B. The first locking member 211A is provided on one side (e.g., the front side) of the seat plate assembly 2 and is operably connected to a corresponding unlocking operation portion 212, and the second locking member 211B is provided on the other side (e.g., the rear side) of the seat plate assembly 2. The first locking member 211A and the second locking member 211B are connected by a linkage member 27, and the linkage member 27 allows the first locking member 211A and the second locking member 211B to move synchronously.

[0169] Here, the linkage assembly 25 and the linkage member 27 may be collectively referred to as a linkage device 257, which is connected to a plurality of locking members 211 (a plurality of first locking members 211A and / or a plurality of second locking members 211B), and these locking members 211 can move together with the movement of the unlocking operation part 212, thereby realizing the synchronous unlocking or synchronous locking of an object by the plurality of locking members 211.

[0170] For example, as shown in FIG. 20 , in this embodiment of the present invention, two unlocking operation units 212 are provided. The two unlocking operation units 212 are located on both lateral sides (i.e., left and right sides) of the seat plate assembly 2, respectively, and are movable between a locked state and an unlocked state relative to the seat plate assembly 2. Correspondingly, in this embodiment, two first locking members 211A and two second locking members 211B are further provided. The two first locking members 211A are movably provided on one side of the seat plate assembly 2 and connected (e.g., fixedly connected) to corresponding (e.g., adjacent) unlocking operation units 212. The two second locking members 211B are movably provided on the other side of the seat plate assembly 2, and each second locking member 211B is connected to the corresponding first locking member 211A via a linkage member 27.

[0171] In the embodiment, the two first locking members 211A may be provided on the front side of the sheet plate assembly 2 and fixedly connected to adjacent unlocking operation portions 212. The two second locking members 211B are provided on the rear side of the sheet plate assembly 2 and are connected to the two first locking members 211A via corresponding linkage members 27, respectively, and move synchronously with the two first locking members 211A. More specifically, as shown in FIGS. 20 and 21 , the two unlocking operation portions 212 are provided symmetrically on both sides of the sheet plate assembly 2 with respect to a center line M5-M5 of the sheet plate assembly 2, and the center line M5-M5 of the sheet plate assembly 2 extends along the longitudinal direction F2 of the sheet plate assembly 2. The two first locking members 211A are disposed between the two unlocking operation portions 212 symmetrically with respect to the center line M5-M5, and each first locking member 211A is fixedly connected to its adjacent unlocking operation portion 212.

[0172] 21 , in this embodiment, each locking member 211 is switched to the unlocked position by moving in a direction toward the center line M5-M5, and correspondingly, each locking member 211 is switched to the locked position by moving in a direction away from the center line M5-M5. That is, the movement directions of the multiple locking members 211 (the first locking member 211A and the second locking member 211B) located on the same side of the center line M5-M5 are the same. Of course, in other embodiments, some locking members 211 may be switched to the unlocked position by moving in a direction away from the center line M5-M5 and switched to the locked position by moving in a direction away from the center line M5-M5, and some other locking members 211 may be switched to the unlocked position by moving in a direction away from the center line M5-M5 and switched to the locked position by moving in a direction toward the center line M5-M5. That is, the movement directions of the multiple locking members 211 (first locking member 211A and second locking member 211B) located on the same side of the center line M5-M5 are opposite to each other.

[0173] 20 , the linkage member 27 may be a traction member (e.g., a traction rope) 271. Specifically, the traction member 271 may be installed to extend within the seat plate assembly 2, and the first locking member 211A and the second locking member 211B installed along a diagonal line with respect to the center line M5-M5 of the seat plate assembly 2 may be connected to each other by the same traction member 271, and the first locking member 211A and the second locking member 211B connected by the same traction member 271 move in opposite directions. For example, the first locking member 211A located on the left front side is connected to the second locking member 211B on the right rear side via one traction member 271, and the first locking member 211A located on the right front side is connected to the second locking member 211B on the left rear side via the other traction member 271. In this way, when any unlocking operation unit 212 is operated to switch to the unlocked state, the unlocked operation unit 212 moves the corresponding first locking member 211A in the direction of the center line M5-M5 to switch to the unlocked position, and by the action of the pulling member 271, the first locking member 211A moves the second locking member 211B connected to the first locking member 211A (provided along a diagonal line to the first locking member 211A) in the opposite direction, thereby moving the second locking member 211B toward the center line M5-M5 to switch to the unlocked position. When the unlocking operation unit 212 is released to switch to the locked state, the first locking member 211A and the second locking member 211B, which are connected via the same pulling member 271, both move in directions away from the center line M5-M5 and move synchronously to the locked position.

[0174] Of course, in other embodiments, the movement directions of the multiple locking members 211 located on the same side of the center line M5-M5 may be reversed, for example, and the first locking member 211A and the second locking member 211B located on the same side of the center line M5-M5 of the seat plate assembly 2 may be connected by the same pulling member 271. When the unlocking operation unit 212 is operated to switch to the unlocked state, the movement directions of the first locking member 211A and the second locking member 211B connected via the same pulling member 271 are reversed, for example, the first locking member 211A moves in a direction approaching the center line M5-M5 to switch to the unlocked position, and the second locking member 211B moves in a direction away from the center line M5-M5 to switch to the unlocked position.

[0175] In this embodiment, the traction member 271 may be a steel wire, covered with a steel wire cover and hidden in the sheet plate assembly 2. In other embodiments, the traction member 271 may be a flexible member such as a composite wire.

[0176] As shown in FIG. 20 , in an embodiment, the distance of the linkage assemblies 25 located between the two first locking members 211A and / or the two second locking members 211B can be adjusted so that the two first locking members 211A move synchronously in opposite directions and / or the two second locking members 211B move synchronously in opposite directions. For example, the linkage assembly 25 may be a four-bar linkage mechanism formed by connecting two of four seat strips (specifically, formed by hinges on two of the four seat strips), and the four-bar linkage mechanism has a fixed pivot point fixed to the seat plate assembly 2 (the upper housing of the seat plate assembly 2 has been removed in Figure 20 to show the structure of the locking mechanism 21), and can extend (corresponding to the locked state of the unlocking operation unit 212) and shorten (corresponding to the unlocked state of the unlocking operation unit 212) on both sides of the center line at the position of this fixed pivot point.

[0177] 20, specifically, the four-bar link mechanism includes a first link rod 251, a second link rod 252, a third link rod 253, and a fourth link rod 254. The first link rod 251, the second link rod 252, the third link rod 253, and the fourth link rod 254 are connected in pairs to form four connection points, which correspond to pivot shafts A1, A2, A3, and A4. One of the four connection points is a fixed pivot point (or called a fixed connection point), and more specifically, the pivot shaft A1 is fixed to a fixed structure of the engagement base assembly 200 (e.g., the seat plate assembly 2) as the fixed pivot point. To the two first locking members 211A or the two second locking members 211B, a third link rod 253 and a fourth link rod 254 are connected, respectively, via pivot shafts A5 and A6, to a central connection point (corresponding to pivot shaft A2) facing a fixed rotary contact. That is, taking the linkage assembly 25 located between the two first locking members 211A as an example, the linkage assembly 25 includes a fixed pivot point (pivot shaft A1) located between the two first locking members 211A, and is pivotally connected to the first locking members 211A on both sides via pivot shafts (pivot shaft A5 of the third link rod 253 and pivot shaft A6 of the fourth link rod 254) located on both sides of the fixed pivot point, and the distance between the pivot shaft A5 and the pivot shaft A6 corresponds to the length of the two first locking members 211A of the linkage assembly 25. When a linkage member is provided between the two second locking members 211B, the structure of the linkage member and its connection to the two second locking members 211B can refer to the structure of the linkage assembly 25 and its connection to the two first locking members 211A. In other words, the two second locking members 211B have the same structure as the two first locking members 211A.

[0178] Of course, in an embodiment, if the movement directions of the first locking member 211A and the second locking member 211B located on the same side as the center line M5-M5 are parallel to the second direction F2, a linkage assembly 25 may be provided between the first locking member 211A and the second locking member 211B located on the same side as the center line M5-M5.

[0179] With the linkage assembly 25 configured as described above, when any of the unlocking operation units 212 moves from the locked state to the unlocked state, the locking member 211 connected to that corresponding unlocking operation unit 212 moves in the same direction together with the unlocking operation unit 212, the position of the pivot shaft A1 of the linkage assembly 25 does not move, but the pivot shaft A2 moves, and the movement direction of the pivot shaft A2 is perpendicular to the movement direction of the locking member 211. In other words, the connection line between the fixed connection point and the central connection point is perpendicular to the movement direction of the two first locking members 211A.

[0180] The unlocking operation process of the engagement table assembly 200 in which the linkage assembly 25 and the linkage members 27 (e.g., the traction member 271) are arranged is as follows: when the unlocking operation units 212 are in the locked state, the user operates any of the unlocking operation units 212 to move the unlocking operation unit 212 from the locked state to the unlocked state, and the unlocking operation unit 212 moving to the unlocked state moves the first locking member 211A connected thereto. Due to the action of the linkage assembly 25, the two first locking members 211A move synchronously in opposite directions (e.g., approaching each other) to move to the unlocked position, and due to the action of the linkage members 27, the two first locking members 211A move the two second locking members 211B in opposite directions (e.g., approaching each other) to move to the unlocked position. The two first locking members 211A and the two second locking members 211B simultaneously move to the unlocked position, i.e., can unlock an object locked by the engagement base assembly 200. Conversely, when the unlocking operation unit 212 moves from the unlocked state to the locked state, the two first locking members 211A synchronously move away from each other to the locked position, and the two second locking members 211B synchronously move away from each other to the locked position, by the linkage assembly 25 and the linkage member 27. In other words, when either of the first locking members 211A moves, the pivot shaft A5 and the pivot shaft A6 move in opposite directions.

[0181] Of course, in other embodiments, when the movement directions of the two first locking members 211A are the same, the two first locking members 211A and / or the two second locking members 211B can also be synchronously moved in the same direction by other types of linkage assemblies 25.

[0182] 20 , the engagement base assembly 200 further includes an elastic device 24 that provides a force for fixing or resetting the unlocking operation portion 212 to the locked state and drives the locking member 211 to reset it to the locked position. In this embodiment, the elastic device 24 is provided between the two first locking members 211A and provides a force for moving the two first locking members 211A away from each other, i.e., a force for moving the two first locking members 211A to the locked position. Preferably, the elastic device 24 may be provided between the two second locking members 211B and provides a force for moving the two second locking members 211B away from each other, i.e., a force for moving the two second locking members 211B to the locked position. For example, the elastic device 24 may be a compression spring. In another embodiment, when multiple locking members 211 on the same side move in the same direction to move synchronously to the locked position or the unlocked position, the multiple locking members 211 on the same side may be fixedly connected, and an elastic device 24 is provided between the fixed structure of the engaging base assembly 200 (for example, the seat plate assembly 2 shown in Figure 21) and at least one locking member 211, and the elastic device 24 applies a force to the unlocking operation portion 212 via the locking member 211 to move it to the locked state. The above-mentioned multiple locks on the same side may be, for example, two first locking members 211A located on the front side, or two second locking members 211B located on the rear side, or two locking members located on the right side (the first locking member 211A on the right side and the second locking member 211B on the right side), or two locking members located on the left side (the first locking member 211A on the left side and the second locking member 211B on the left side). Note that the terms "front side," "rear side," "right side," and "left side" here all refer to directions relative to the direction shown in FIG. 20, and for example, the lower left side in FIG. 20 corresponds to the front side of the engagement table assembly 200, and the upper right side corresponds to the rear side of the engagement table assembly 200.

[0183] In addition, the elastic device 24 may be provided between at least one locking member 211 and the seat plate assembly 2 (for example, when two first locking members 211A are fixedly connected or two second locking members 211B are fixedly connected), and provides a force to fix or reset the unlocking operation portion 212 to a locked state via the locking member 211.

[0184] As shown in FIG. 20 , in this embodiment, two first locking members 211A are fixedly connected to each other by a corresponding unlocking operation unit 212 and a corresponding sliding member 225. Each sliding member 225 is slidable in a slide groove of the locking mechanism 21. When a user performs an unlocking operation on any of the unlocking operation units 212, the first locking member 211A and the unlocking operation unit 212 connected by the same sliding member 225 slide synchronously, and the linkage assembly 25 causes the two first locking members 211A to slide toward each other and move to the unlocked position. Of course, in other embodiments, the first locking member 211A and the corresponding unlocking operation unit 212 may be connected in other ways, such as by bolt connection or adhesive bonding. Preferably, the sliding member 225 may be integrally molded with the corresponding unlocking operation unit 212.

[0185] 20 and 21, a locking portion 2111 (shown in FIG. 21) is provided at one end of the first locking member 211A, and an opening 2011 is provided in the seat plate assembly 2 at a position corresponding to the locking portion 2111. When the upper housing of the seat plate assembly 2 is attached above the locking mechanism 21, the locking portion 2111 can protrude from the opening 2011 of the seat plate assembly 2. For example, the front side of the seat plate assembly 2 has an upwardly protruding structure corresponding to the position of each first locking member 211A, and the upwardly protruding structure has an engagement passage (which may also be called a recess) 22 located at the end of each first locking member 211A, and the engagement passage 22 penetrates the upwardly protruding structure along the second direction F2 to accommodate at least a portion of an object. The position of the engagement passage 22 corresponds to the engagement point described above. An opening 2011 is provided in the passage wall of the engagement passage 22 so that the locking portion 2111 protrudes from the seat plate assembly 2. The rear side of the seat plate assembly 2 (i.e., the position corresponding to each second locking member 211B) also has the same upward protruding structure, and a description thereof will be omitted here. When an object is placed on the seat plate assembly 2, the engagement passage 22 accommodates at least a portion of the object (e.g., a bracket device of a sleeping box, more specifically, the engagement member 311), and the locking portion 2111 protrudes from the opening 2011 and locks the portion of the object into the engagement passage 22. In an embodiment, as shown in FIG. 21 , the locking portion 2111 presents a downwardly inclined surface from the upper surface of the opening protruding portion, and the portion of the object to be locked moves along the inclined surface and enters the engagement passage 22.

[0186] Also, as shown in FIG. 21, the protruding upper housing structure of the seat plate assembly 2 is located above the engagement passage 22 and on the side opposite the opening 2011 of the engagement passage 22, and further includes an inclined surface 213 that guides the locking of an object (not shown) with the engagement table assembly 200.

[0187] 22 and 23 show the locked and unlocked states of the locking mechanism 21 according to an embodiment of the present invention. Specifically, Fig. 22 shows a cross-sectional view taken along line B2-B2 of Fig. 21 with the locking mechanism 21 in the locked position. Fig. 23 shows the locking mechanism 21 switching from the locked position shown in Fig. 22 to the unlocked position.

[0188] As shown in FIG. 22, when the locking mechanism 21 is in the locked state, each unlocking operation portion 212 is in the locked state (also referred to as the initial state), and each first locking member 211A fixedly connected to the corresponding unlocking operation portion 212 is in its locked position. That is, the engaging portion 2111 of each first locking member 211A protrudes into the corresponding engagement passage 22 from the seat plate assembly 2. At the same time, the second locking member 211B is also held in the locked position. At this time, the first locking member 211A and the second locking member 211B lock objects on both the front and rear sides of the seat plate assembly 2, respectively. At this time, the elastic device 24 located between the two first locking members 211A is in the initial state (e.g., in a tensioned state), and the elastic device (not shown) located between the two second locking members 211B is also in the initial state (e.g., in a tensioned state). In this embodiment, the pivot shaft A2 of the four-bar linkage of the linkage assembly 25 is located in an upper position, i.e., in a position adjacent to the pivot shaft A1, as shown in FIG.

[0189] As shown in FIG. 23, when any of the unlocking operation units 212 is operated to move from the locked state to the unlocked state, the first locking member 211A fixedly connected to the unlocking operation unit 212 moves to the unlocked position in conjunction with the movement of the unlocking operation unit 212. At the same time, the linkage assembly 25 synchronously moves the other first locking member 211A and the unlocking operation unit 212, and each linkage member 27 (pulling member 271 in this embodiment) synchronously moves the corresponding second locking member 211B (not shown in FIG. 23). The locking portions 2111 of the two first locking members 211A and the locking portions of the two second locking members 211B (not shown in FIG. 23) retract into the seat plate assembly 2, unlocking the object. At this time, the elastic device 24 located between the two first locking members 211A is in a state (e.g., a compressed state) that attempts to reset the unlocking operation unit 212 to the locked state. Optionally, the elastic device (not shown) located between the two second locking members 211B is also in a compressed state. In this embodiment, the pivot shaft A2 of the four-bar linkage mechanism of the linkage assembly 25 is located downward as shown in FIG. 23, i.e., at a position away from the pivot shaft A1. That is, when the unlocking operation unit 212 moves from the locked state to the unlocked state, the pivot shaft A2 of the linkage assembly 25 moves substantially vertically downward relative to the pivot shaft A1.

[0190] After the unlocking operation unit 212 is released, for example, the elastic device 24 between the two first locking members 211A moves the two first locking members 211A away from each other, causing the two unlocking operation units 212 to synchronously return from their respective unlocked states to their locked states, and simultaneously moving the two second locking members 211B away from each other, returning the locking mechanism 21 to the locked state shown in Fig. 22. In another embodiment, after the unlocking operation unit 212 is released, the elastic device between the two second locking members 211B (not shown) moves the two second locking members 211B away from each other, causing the two first locking members 211A to separate from each other, and simultaneously resetting each unlocking operation unit 212 from its respective unlocked state to its locked state, returning the locking mechanism 21 to the locked state shown in Fig. 22.

[0191] 24 shows a wheeled transportation device 1000 according to an embodiment of the present invention, with the box body of the carrier 300 removed to show the connection relationship between the bracket device 310 of the carrier 300 and the locking mechanism 21. The carrier 300 is not limited to a sleeping box.

[0192] As shown in Figure 24, when the carrier 300 is attached to the seat plate assembly 2 by the locking mechanism 21 (the unlocking operation portion 212 is in the locked state), the engaging member 311 (for example, the annular structural member shown in Figure 24) portion of the third bracket 3113 is locked in the space defined by the engaging passage 22 and the locking portion 2111, and the carrier 300 is locked to the seat plate assembly 2.

[0193] 25 and 26, there are shown schematic diagrams of a locking mechanism 21 and a carrier 300 placed thereon according to an embodiment of the present invention, where Fig. 25 shows the carrier 300 placed on the sheet plate assembly 2 and locked by the locking mechanism 21, and Fig. 26 shows the carrier 300 placed on the sheet plate assembly 2 but with the locking mechanism 21 in an unlocked state.

[0194] As shown in FIG. 25, when the locking mechanism 21 is in the locked state, the engaging portion 2111 of the first locking member 211A protrudes from the opening 2011 in the engagement passage 22 of the seat plate assembly 2 to lock the engagement member 311 of the carrier 300 in the engagement passage 22.

[0195] As shown in Figure 26, when the locking mechanism 21 returns from the locked state to the unlocked state, the engaging portion 2111 is retracted into the seat plate assembly 2 (for example, the opening 2011 in the engagement passage 22), and at this time the engagement member 311 of the carrier 300 can move out of the engagement passage 22, i.e., the carrier 300 can be removed.

[0196] 27-28, an engaging platform assembly 200 according to another embodiment of the present invention is shown with the upper housing of the seat plate assembly 2 removed to reveal the locking mechanism 21.

[0197] In another embodiment of the present invention, as shown in FIG. 27 , the linkage member 27 may include at least one link rod 272. Specifically, each link rod 272 can connect two locking members 211 located on both the front and rear sides of the engagement base assembly 200, particularly a first locking member 211A and a second locking member 211B provided along a diagonal line. In the disclosed example, both ends of the two link rods 272 pivotally connect the first locking member 211A and the second locking member 211B provided along a diagonal line, respectively, and the two link rods 272 are provided at an intersection, forming an angle θ between the two link rods 272. In the embodiment, the two link rods 272 are connected at their intersection. More specifically, the two link rods 272 are pivotally connected by a pivot shaft 2721 ( FIG. 29 ) at their intersection. The angle θ corresponds to the angle that the connection points of the two link rods 272 and the two second locking members 211B make with respect to the intersection points of the two link rods 272. The angle θ can also be understood to correspond to the angle defined by the intersection points of the connection points of the two link rods 272 and the two first locking members 211A with respect to the two link rods 272.

[0198] When any of the unlocking operation units 212 is operated, the two first locking members 211A move synchronously toward each other and approach each other due to the action of the linkage assembly 25, the two first locking members 211A move synchronously from the locked position to the unlocked position, the angle θ between the two link rods 272 gradually decreases, and the two link rods 272 drive the two second locking members 211B to move toward each other and approach each other. When the unlocking operation unit 212 is unlocked, the two first locking members 211A move synchronously away from each other, the two first locking members 211A move synchronously from the unlocked position to the locked position, the angle θ between the two cross-connected link rods 272 gradually increases, and the two second locking members 211B move away from each other.

[0199] As can be seen from FIG. 28, in this embodiment, both ends of each link rod 272 are pivotally connected to a corresponding first locking member 211A and second locking member 211B from the bottom, respectively.

[0200] FIG. 29 schematically illustrates an engagement table assembly 200 provided with a retention mechanism 23 according to an embodiment of the present invention, with the upper housing of the seat plate assembly 2 removed to show the retention mechanism 23. As shown in FIG. 29, the engagement table assembly 200 of the present invention further includes a retention mechanism 23 provided between two first locking members 211A and / or two second locking members 211B, which retains the unlocking operation portion 212 in the unlocked state. That is, the retention mechanism 23 is used to retain the engagement table assembly 200 in the unlocked state and to retain the locking members 211 in the unlocked position. In this manner, the user can maintain the engagement table assembly 200 in the unlocked state so that the user can move an object above the engagement table assembly 200 at any time, without continuing to perform an unlocking operation on the unlocking operation portion 212 (e.g., pressing the unlocking operation portion 212).

[0201] Although FIG. 29 shows only an example in which the corresponding first locking member 211A and second locking member 211B are connected using the link rod 272, the holding mechanism 23 is also applicable to the case in which the corresponding first locking member 211A and second locking member 211B are connected via the pulling member 271 (the example shown in FIG. 20).

[0202] 29 and 30 , FIG. 30 is a schematic cross-sectional view of the retention mechanism 23 taken along the line B3-B3 in FIG. 29 , illustrating the structural relationship between the retention mechanism 23 and the seat plate assembly 2. As shown in FIG. 29 , the retention mechanism 23 includes a touch button 2051, a buckle portion 2052, and a reset member 2055 (obscured and not shown in FIG. 29 , but shown in FIG. 30 ). The touch button 2051 is provided on the seat plate assembly 2 (only the lower housing of the seat plate assembly 2 is shown in FIG. 29 ) so that at least a portion of the touch button 2051 can protrude upward relative to the seat plate assembly 2 (specifically, its upper housing; see FIG. 30 ), and can move vertically relative to the seat plate assembly 2. The buckle portion 2052 is provided movably below the touch button 2051 and can move up and down along a slide rail 2054 provided on the touch button 2051. 30 , the reset member 2055 is provided between the fixed structure of the engagement base assembly 200 (for example, the lower housing of the seat plate assembly 2) and the touch button 2051, and the reset member 2055 provides a force that causes the touch button 2051 to protrude upward from the seat plate assembly 2. That is, by the action of the reset member 2055, the touch button 2051 can be reset from the pressed state to the initial released state.

[0203] 30 , in this embodiment, the retaining mechanism 23 further includes an elastic member 2053, which is provided between the touch button 2051 and the buckle portion 2052 and cooperates with the movement of the buckle portion 2052 relative to the touch button 2051. Also, a retaining hook 2102 is provided on a lower portion of one end of the first locking member 211A away from the engaging portion 2111 so as to be hooked onto the buckle portion 2052 of the retaining mechanism 23. The end of the retaining hook 2102 may be chamfered for more secure engagement with the buckle portion 2052.

[0204] 30, when no carrier is placed on the seat plate assembly 2 and no unlocking operation has been performed on the unlocking operation unit 212, the unlocking operation unit 212 is in the locked state (i.e., the initial state), and the holding mechanism 23 is also in the initial state. At this time, the touch button 2051 of the holding mechanism 23 protrudes from above the seat plate assembly 2, the buckle portion 2052 and the holding hook 2102 of the first locking member 211A are separated from each other, and the reset member 2055 and the elastic member 2053 are both in the unlocked state, i.e., not compressed.

[0205] 31 and 32, the operation process of the holding mechanism 23 when the carrier 300 is placed on the seat plate assembly 2 and when the carrier 300 is removed is schematically shown.

[0206] 31, when the user places the carrier 300 on the seat plate assembly 2, the engagement member 311 of the carrier 300 moves downward and is engaged with the engagement passage 22 by the latching portion 2111 of the first locking member 211A, and at the same time, the bottom surface of the carrier 300 presses the touch button 2051 and compresses the reset member 2055. The buckle portion 2052 and the elastic member 2053 connected between the touch button 2051 and the buckle portion 2052 move downward as the touch button 2051 is pressed. At this time, the holding mechanism 23 is in a ready state.

[0207] 32 , when it is necessary to remove the carrier 300 from the seat plate assembly 2, the user can operate (e.g., press) the unlock operation unit 212, and the first locking member 211A connected to the unlock operation unit 212 moves to the unlocked position as the unlock operation unit 212 moves, and the retention hook 2102 of the first locking member 211A moves toward the retention mechanism 23 and hooks onto the buckle portion 2052. More specifically, as the retention hook 2102 moves toward the retention mechanism 23, the end (e.g., its chamfer) of the retention hook 2102 causes the buckle portion 2052 to move upward relative to the touch button 2051 against the force of the elastic member 2053 (i.e., the buckle portion 2052 moves upward relative to the touch button 2051, compressing the elastic member 2053). After the hook portion of the retaining hook 2102 climbs over the buckle portion 2052, the buckle portion 2052 is moved downward by the elastic member 2053 and hooked onto the retaining hook 2102. At this time, the retaining mechanism 23 is in a retaining state, and the buckle portion 2052 is maintained in an engaged state with the retained hook 2102 by the downward pressure applied by the carrier 300 and the elastic member 2053, so that the unlocking operation portion 212 is maintained in an unlocked state, and the engaging member 311 of the carrier 300 is not restrained by the locking portion 2111 (i.e., the carrier 300 remains movable).

[0208] When the carrier 300 is removed, the touch button 2051 again protrudes from above the seat plate assembly 2 due to the action of the reset member 2055, and the buckle portion 2052 moves upward along with the touch button 2051, separating from the retaining hook 2102 of the first locking member 211A, and the unlocking operation portion 212 returns to the locked state shown in Figure 30.

[0209] FIG. 33 is a diagram showing the configuration of the holding mechanism 23 according to the embodiment of the present invention.

[0210] As shown in FIG. 33, the touch button 2051 is installed in a slide passage 2104 provided inside the sheet plate assembly 2 so that it can move up and down along the slide passage 2104. Notch 2105 is symmetrically provided on the wall of the slide passage 2104, and when the holding hook 2102 moves to the holding mechanism 23, it can be inserted into the notch 2105 so as to engage with the buckle portion 2052.

[0211] Also, as shown in FIG. 33, in the embodiment, when the carrier 300 (shown in FIGS. 31 and 32) is attached to the sheet plate assembly 2, the distance by which the locking portion 2111 retreats is L1. The distance required for the holding hook 2102 and the buckle portion 2052 to engage (that is, the distance from the buckle portion 2052 of the holding hook 2102 to the farthest end) is L2. The distance by which the unlocking operation portion 212 is pressed to perform unlocking is L3. In the embodiment, since L1 < L2 < L3, when the carrier 300 (not shown in FIG. 33, see FIG. 31) is locked to the sheet plate assembly 2, the holding hook 2102 is not caught by the buckle portion 2052, and the holding hook 2102 is caught by the buckle portion 2052 only when the unlocking operation portion 212 is pressed.

[0212] The engagement platform assembly 200 includes a linkage assembly 25 between the first locking members 211A, a linkage member 27 between the first locking members 211A and the second locking members 211B, and a retaining mechanism 23, so that the user can simultaneously unlock the multiple locking members 211 by operating only one of the unlocking operation units 212, providing a wheeled transport device 1000 with a convenient and simple structure and allowing the user to easily (e.g., with one hand) separate the carrier 300 from the frame 100, providing a better user experience. Optionally, a support frame 241 with a vibration damping effect can be provided to provide cushioning support for the carrier 300 attached to the frame 100 and any infants or pets therein when the frame 100 is moving, providing a more comfortable and safer wheeled transport device.

[0213] Second Example

[0214] Please refer to FIG. 34, which shows a perspective schematic view of a wheeled transportation device 1000 according to an embodiment of the present invention.

[0215] As shown in FIG. 34 , a wheeled transportation device 1000 may include a frame 100, an engagement base assembly 200, and a carrier 300. The engagement base assembly 200 may be attached to the frame 100, and the carrier 300 may be fixed to the frame 100 via the engagement base assembly 200 so as to move together with the frame 100. In an embodiment, the carrier 300 may include a container 340 and a bracket device 310. The container 340 provides a storage space for placing a baby or a pet. The bracket device 310 is attached to the container 340 to support the container 340. The bracket device 310 is engageable with the engagement base assembly 200 so that the carrier 300 can be removably attached to the frame 100 by the bracket device 310.

[0216] The connection relationship between the frame 100 of the wheeled transportation device 1000 and the engagement table assembly 200 will be specifically described below.

[0217] First, referring to Figures 35 and 36, Figure 35 is a perspective schematic view of a frame 100 according to an embodiment of the present invention, and Figure 36 is a three-dimensional schematic view of the frame 100 shown in Figure 35 from another angle.

[0218] The frame 100 of the present invention includes a front support rod 11, a rear support rod 12, and an upper support rod 13, with the front support rod 11 connected to a front wheel 191, the rear support rod 12 connected to a rear wheel 192, and the upper support rod 13 connected to a handlebar 14.

[0219] In an embodiment, as shown in FIGS. 35 and 36 , one end of the front support rod 11, one end of the rear support rod 12, and one end of the upper support rod 13 are pivotally connected to one another at pivot portions (which may also be referred to as first pivot portions) 118, thereby allowing the front support rod 11, the rear support rod 12, and the upper support rod 13 to be folded relative to one another by the pivot portions 118. Specifically, the front support rod 11 has a U-shaped structure and includes two bars 111 located on both the left and right sides and a first cross bar 101 connected between the two bars 111. The rear support rod 12 may include two parallel bars 121 and a rear cross bar 122 connected between the two bars 121. The upper ends of the bars 111 of the front support rod 11 are pivotally connected to the upper ends of the bars 121 of the rear support rod 12 by the pivot portions 118. At least one front wheel 191 is connected to the lower side of the front support rod 11. The lower ends of the two crossbars 122 of the rear support rod 12 are connected to the corresponding rear wheels 192. The handlebar 14 is located at the upper end of the upper support rod 13 and is pivotally connected to the upper support rod 13 via a pivot portion (also referred to as a second pivot portion) 117. Of course, the present invention is not limited to the above structure, and in an embodiment, the front support rod 11 may have a V-shaped or I-shaped structure, and the rear support rod 12 may be installed in an integrally molded U-shaped structure, etc.

[0220] In an embodiment, as shown in FIG. 35, the size of the rear wheels 192 may be larger than the size of the front wheels 191 so that the overall structure of the wheeled transportation device 1000 is more stable.

[0221] 34 and 35, the frame 100 is further provided with a connection assembly 15 (which serves as a support structure for the engagement base assembly 200 and will be described in detail later) that attaches the engagement base assembly 200 to the frame 100, and the connection assembly 15 is pivotally connected to the frame 100, so that the engagement base assembly 200 can pivot via the connection assembly 15 as the frame 100 is folded. The connection assembly 15 can be unfolded or folded.

[0222] As explained in the first embodiment above, when the wheeled transportation device 1000 is fully unfolded, the first direction F1 corresponds to the left-right direction, and the second direction F2 corresponds to the front-rear direction.

[0223] In an embodiment, as shown in FIGS. 35 and 36, the connection assembly 15 may include a first coupling member 151, a secondary support member 152, and a linkage member 153.

[0224] As shown in Figure 35, one end (front end) of the first connecting member 151 is pivotally connected to the front support rod 11 at a first pivot point O1. The auxiliary support member 152 is pivotally connected to the other end (rear end) of the first connecting member 151 at a second pivot point O2, and the auxiliary support member 152 is pivotally connected to the rear support rod 12 at a third pivot point O3. One end (upper end) of the linkage member 153 is pivotally connected to the upper support rod 13 at a fourth pivot point O4, and the other end (lower end) of the linkage member 153 is pivotally connected to the auxiliary support member 152 at a fifth pivot point O5. In this way, when the frame 100 is folded, the auxiliary support member 152 can be pivoted. The fifth pivot point O5 is located between the second pivot point O2 and the third pivot point O3, and the second pivot point O2 is located between the first pivot point O1 and the fifth pivot point O5. In an embodiment, the fifth pivot point O5 may overlap with the second pivot point O2.

[0225] Referring to FIG. 36 , in an embodiment, the linkage member 153 may have a generally S-shaped structure, which prevents interference with the rear support rod 12, the seat plate assembly 2 of the engagement base assembly 200 (not shown in FIG. 36 , see FIG. 37 ), or other members when the frame 100 is folded. That is, the S-shaped structure of the linkage member 153 forms the avoidance structure. Specifically, the generally S-shaped structure sequentially includes a first segment 15311, a second segment 15312, and a third segment 15313. The second segment 15312 is generally perpendicular to the first segment 15311, and the third segment 15313 is generally perpendicular to the second segment 15312. When the frame 100 is unfolded, the first segment 15311 generally overlaps the upper support rod 13. Of course, the present invention is not limited to this, and the linkage member 153 may be designed to avoid other shapes or structures of other members when folded. Furthermore, the linkage member 153 may be in the form of a straight rod when other members are adjusted to prevent interference between multiple rods or members when folded.

[0226] 35, in an embodiment, the first connecting member 151 includes two first tubes 1511 located on both the left and right sides, and one end of each first tube 1511 is connected to the bars 111 of the front support rods 11 on both sides. The auxiliary support member 152 has a generally U-shaped structure, and both ends of the auxiliary support member 152 are connected to the other end of the first tube 1511 of the corresponding first connecting member 151. In an embodiment, the auxiliary support member 152 includes two linear bars 1521, and each bar 1521 is connected between the first tube 1511 and the bar 121 on the same side (left side or rear side). Of course, the present invention is not limited to this.

[0227] As shown in FIGS. 35 and 36, in the embodiment, when the frame 100 is unfolded, the first connecting member 151 and the auxiliary support member 152 are horizontally disposed and extend along the front-to-rear direction (second direction F2). Specifically, the first tube 1511 of the first connecting member 151 and the tube (hereinafter referred to as the second tube) of the adjacent auxiliary support member 152 extend along the front-to-rear direction (second direction F2). The first pivot point O1, the second pivot point O2, the third pivot point O3, and the fifth pivot point O5 are on the same horizontal plane. In the embodiment, the first pivot point O1, the second pivot point O2, the third pivot point O3, and the fifth pivot point O5 are essentially on a straight line.

[0228] Referring to Figures 37 and 38, Figure 37 shows a schematic perspective view of an engagement table assembly 200 according to an embodiment of the present invention, and Figure 38 shows a schematic three-dimensional view of the engagement table assembly 200 shown in Figure 37 after the seat plate assembly 2 has been removed.

[0229] As shown in FIGS. 37 and 38 , the engagement base assembly 200 includes a seat plate assembly 2 and a locking mechanism 21 that locks the carrier 300 (not shown in FIGS. 37 and 38 , see FIG. 34 ) to the seat plate assembly 2. The engagement base assembly 200 has multiple engagement points that support and position the carrier 300, thereby improving the connection stability between the carrier 300 and the engagement base assembly 200. It is understood that each of the engagement points is provided with a locking member 211. In an embodiment, the multiple engagement points are arranged in a rectangular array on the seat plate assembly 2, thereby arranging the multiple engagement points in at least two rows. For example, as shown in FIG. 37 , the multiple engagement points may be arranged symmetrically (bilaterally) on the engagement base assembly 200 along the longitudinal centerline M5-M5 of the engagement base assembly 200, thereby more stably locking the carrier 300 to the seat plate assembly 2 of the engagement base assembly 200. Preferably, four engagement points may be provided, and the four engagement points are symmetrically arranged on the engagement base assembly 200. That is, the four engagement points are arranged symmetrically on the left and right sides and the front and rear sides of the engagement table assembly 200.

[0230] Unless inconsistent, the structure of the engaging base assembly 200 can refer to the description of the engaging base assembly 200 in the previous first embodiment. Referring to FIGS. 37 and 38 , specifically, in this embodiment, the locking mechanism 21 includes a plurality of locking members 211, which are connected by a linkage device and can move synchronously to the unlocked position. The linkage assembly can refer to the description in the first embodiment, and includes, for example, a linkage assembly 25 and a linkage assembly (not shown in FIG. 38 ). The seat plate assembly 2 may further be equipped with an unlocking operation unit 212, which is connected to at least one locking member 211 and drives the locking member 211 to move to the unlocked position. The engaging base assembly 200 may further include an elastic device 24, which can drive the locking member 211 to move to the locked position. More specifically, the locking mechanism 21 in this embodiment includes four locking members 211, each of which is composed of two first locking members 211A and two second locking members 211B. The two first locking members 211A may be located on the front side of the seat plate assembly 2, and a linkage assembly 25 may be provided between the two first locking members 211A. The two second locking members 211B may be located on the rear side of the seat plate assembly 2, and a linkage assembly 25 may be provided between the two second locking members 211B. For the structure of the linkage assembly 25, refer to the description of the first embodiment. The first locking member 211A and the second locking member 211B, which are located at diagonal angles, may be connected by the linkage member 27 in the first embodiment.

[0231] In this embodiment, two unlocking operation units 212 are attached to the seat plate assembly 2, and the two unlocking operation units 212 are respectively drivingly connected to the two first locking members 211A. When either unlocking operation unit 212 is pressed down, the two first locking members 211A and the two second locking members 211B slide synchronously in the left-right direction and move to the unlocked position due to the action of the linkage device.

[0232] In some embodiments, the linkage device may omit a linkage member and retain each linkage assembly 25. In some embodiments, the first locking member 211A and the second locking member 211B may not be interlocked, and the first locking member 211A and the second locking member 211B may be driven to the unlocked position by different unlocking operating units 212.

[0233] In an embodiment, as shown in FIG. 37 , the seat plate assembly 2 may have a first extension portion 21011. The first extension portion 21011 extends from one end of the seat plate assembly 2 (e.g., the rear end, i.e., the end closest to the rear wheels 192 as shown in FIGS. 34 and 35 ). More specifically, the first extension portion 21011 extends a certain distance rearward from the center of the rear end of the seat plate assembly 2 to provide a larger support surface, thereby more stably supporting the carrier 300 (not shown in FIG. 37 ) installed above it. Note that the “rear end” here refers to the rear side with respect to the frame 100 (e.g., the rear wheels 192 are located on the rear side of the frame 100). The front, rear, left, and right of the seat plate assembly 2 correspond to the front, rear, left, and right of the frame 100. In an embodiment, the first extension portion 21011 may be provided as a handle, which is convenient for lifting and moving the frame 100 and the engagement table assembly 200 after they are folded. In an embodiment, the seat plate assembly 2 may be installed in a hollow form, for example, in a ring-shaped structure as shown in FIG. 37 (i.e., the middle region of the seat plate assembly 2 is hollow), so that when the frame 100 is folded together with the engaging base assembly 200, the openwork design of the seat plate assembly 2 can grip, lift or move the entire frame structure (see, for example, FIG. 48).

[0234] 37 , in an embodiment, the seat plate assembly 2 may further include a second extension portion 21012. The second extension portion 21012 extends from the front end of the seat plate assembly 2 (i.e., the end closer to the front wheel 191) to provide an extra support surface, thereby improving the stability of the carrier 300 on the frame 100 and contributing to balance after the carrier 300 is fully engaged with the frame 100.

[0235] In an embodiment, as shown in Figures 37 and 38, the engagement base assembly 200 may be provided on a seat plate support member 2031 and connected to the frame 100 via the seat plate support member 2031 (see Figure 34). In an embodiment, as shown in Figure 38, the seat plate support member 2031 may have a U-shaped structure, but the present invention is not limited thereto. The connection between the seat plate support member 2031 and the frame 100 will be described later with reference to Figures 39 and 40.

[0236] Referring to Figures 39 and 40, Figure 39 shows a schematic perspective view of the frame 100 shown in Figure 35 and the seat plate support member 2031 attached to the frame 100, and Figure 40 shows a schematic perspective view of the frame 100 and the seat plate support member 2031 shown in Figure 39 at another angle.

[0237] 39 and 40 , the sheet plate support member 2031 is provided inside the auxiliary support member 152 and is connected to the auxiliary support member 152, so that the sheet plate support member 2031 can move synchronously with the auxiliary support member 152, thereby moving synchronously with the engaging base assembly 200 (not shown in FIGS. 39 and 40 , see FIG. 41 ) attached to the sheet plate support member 2031, and folding synchronously with the engaging base assembly 200 and the frame 100. In an embodiment, the other end of the first connecting member 151 is inserted between the sheet plate support member 2031 and the auxiliary support member 152. For example, the auxiliary support member 152 and the seat plate support member 2031 are connected to each other at the second pivot point O2 via a pivot shaft drilled in the first connecting member 151, and the auxiliary support member 152 and the seat plate support member 2031 are provided on both sides of the first connecting member 151, so that the auxiliary support member 152 and the seat plate support member 2031 can pivot synchronously with respect to the first connecting member 151. In addition, the other end of the linkage member 153 (i.e., the end where the linkage member 153 is connected to the auxiliary support member 152) is interposed between the seat plate support member 2031 and the auxiliary support member 152. In an embodiment, the auxiliary support member 152 may be fixedly connected to the seat plate support member 2031, or the two may be integrally formed. In another embodiment, both the auxiliary support member 152 and the seat plate support member 2031 may be connected to the engagement base assembly 200.

[0238] In the above embodiment, the fixedly connected auxiliary support member 152 and the seat plate support member 2031 can be combined to form a second connecting member. However, the second connecting member may include only the auxiliary support member 152, and the auxiliary support member 152 may have a U-shaped structure.

[0239] Further, referring to Figures 41 to 44, Figure 41 shows a schematic perspective view of the frame 100 of the present invention and the engagement table assembly 200 attached to the frame 100, Figure 42 shows a schematic perspective view of the frame 100 and the engagement table assembly 200 shown in Figure 41 from another angle, Figure 43 shows a side view of the wheeled transport device 1000 shown in Figure 34, and Figure 44 shows a front view of the wheeled transport device 1000 shown in Figure 43 after the carrier 300 has been removed.

[0240] As shown in FIGS. 41 and 42 , when the frame 100 is unfolded, the engagement base assembly 200 of the present invention may be positioned at a lower position on the frame 100. In an embodiment, the engagement base assembly 200 is positioned at a height lower than the pivot portion 118. For example, the engagement base assembly 200 may be located close to the lower end of the bar 111 of the front support rod 11, or the engagement base assembly 200 may be located at approximately the same height as the lower end of the bar 111 of the front support rod 11. More specifically, as shown in FIG. 43 , the height H1 at which the engagement base assembly 200 is located may be less than the median of the overall height H2 of the frame 100. In an embodiment, the height H1 at which the engagement base assembly 200 is located may be close to or less than one-third of the overall height H2 of the frame 100. Such an arrangement, i.e., the mounting base assembly 200 is mounted at a low position on the frame 100, allows the user to more conveniently and effortlessly place and position the carrier 300 (see FIG. 34) on the mounting base assembly 200, improving ease of use and user experience. Also, the frame 100 can be adapted to carriers 300 of different sizes (e.g., different heights), improving usability.

[0241] 41 and 42, the center of gravity G of the engaging platform assembly 200, which is installed at a low position, can be offset to the rear wheel 192 relative to the pivot portion 118, thereby improving the stability of the frame 100. In particular, after the carrier 300 (see FIG. 43) is attached to the frame 100, the center of gravity G of the engaging platform assembly 200 is located rearward relative to the pivot portion 118, so that the wheeled transport device 1000 will not tip over even if a pet in the carrier 300 approaches the front end of the carrier 300 (at which time the weight of the pet is concentrated at the front end of the carrier 300). The positioning of the center of gravity G of the engaging platform assembly 200 rearward relative to the pivot portion 118 contributes to improving the stability of the overall structure of the wheeled transport device 1000. For example, in an embodiment, the center of gravity G of the engagement base assembly 200 may be close to the plane on which the two bars 121 of the rear support rod 12 are located, or the center of gravity G of the engagement base assembly 200 may be located in the plane on which the two bars 121 of the rear support rod 12 are located.

[0242] 43 and 44, when the frame 100 is unfolded, the horizontal distance L5 between the rear wheel 192 and the front end of the frame 100 (e.g., the handlebar 14) is smaller than the horizontal distance L4 between the front wheel 191 and the rear wheel 192. In addition, the width W3 between the support rods on both sides (e.g., the upper support rod 13) may be larger than the distance W1 between the two front wheels 191, and the width W3 between the support rods on both sides (e.g., the upper support rod 13) may be smaller than the distance W2 between the two rear wheels 192.

[0243] Figures 45 to 48 schematically show the folding process of the frame 100 and the engagement base assembly 200. Here, Figure 45 shows a side view of the frame 100 and the engagement base assembly 200 shown in Figure 41 when fully unfolded, Figure 46 shows a side view of the frame 100 and the engagement base assembly 200 shown in Figure 45 while they are in the process of being folded, Figure 47 shows a side view of the frame 100 and the engagement base assembly 200 shown in Figure 45 after they have been fully folded, and Figure 48 shows a front view of the frame 100 and the engagement base assembly 200 shown in Figure 47.

[0244] As shown in FIGS. 45 and 47 , the frame 100 of the present invention can be folded for transportation and storage. Specifically, the handlebar 14 of the frame 100 is pivotally connected to the upper support rod 13 via a pivot portion 117 and is foldable relative to the upper support rod 13. The front support rod 11, the rear support rod 12, and the upper support rod 13 are pivotally attached to a pivot portion 118 and are foldable relative to one another. Furthermore, when the frame 100 is folded, the engagement base assembly 200 can be pivoted in conjunction with the front support rod 11, the rear support rod 12, and the upper support rod 13 via the connection assembly 15. Specifically, in this embodiment, when the front support rod 11, the rear support rod 12, and the upper support rod 13 are folded relative to one another, the linkage member 153 is driven to rotate the auxiliary support member 152 in conjunction with the front support rod 11, the rear support rod 12, and the upper support rod 13, so that the seat plate support member 2031 fixedly connected to the auxiliary support member 152 and the engagement base assembly 200 attached to the seat plate support member 2031 can also pivot when the frame 100 is folded.

[0245] In the embodiment, when the frame 100 is folded, the front support rod 11, the rear support rod 12, and the upper support rod 13 approach each other, and the connection assembly 15 pivots the rear end of the engagement base assembly 200 (for example, the end provided with the first extension portion 21011, i.e., the end of the engagement base assembly 200 that is closer to the rear wheel 192 or the rear support rod 12) toward the pivot portion 118. Specifically, as shown in FIGS. 46 and 47 , as the front support rod 11, the rear support rod 12, and the upper support rod 13 are folded relative to each other, the upper support rod 13 rotates and interlocks the linkage member 153, and at the same time, the front support rod 11 rotates and interlocks the first coupling member 151, and the auxiliary support member 152 pivots via the first coupling member 151 and the linkage member 153. The auxiliary support member 152 further pivots the seat plate support member 2031 connected to the auxiliary support member 152, causing the rear longitudinal ends of the seat plate support member 2031 and the engaging base assembly 200 attached thereto to pivot (pivot upward) toward the pivot portion 118, and the front longitudinal end of the engaging base assembly 200 to pivot downward. As can be seen from FIG. 46 , the engaging base assembly 200 is folded so that its upper surface pivots toward the front side of the frame 100. The engaging base assembly 200 is stored in the overall configuration of the frame 100 as the frame 100 is folded, and FIG. 47 shows the frame 100 in a completely folded state.

[0246] Referring to FIG. 47, in an embodiment, when the frame 100 is fully folded, the front support rod 11, rear support rod 12, upper support rod 13, and handlebar 14 are folded to their closest positions, and as the frame 100 pivots, the engagement base assembly 200 is stored between the front support rod 11 and the upper support rod 13.

[0247] Third Example

[0248] FIG. 49 shows a perspective view of a wheeled transportation device 1000 according to an embodiment of the present invention, which may include a frame 100 and an engagement platform assembly 200. In some embodiments, the wheeled transportation device 1000 may further include a carrier 300. In the embodiment shown in FIG. 49, the wheeled transportation device 1000 is illustratively described as a trolley, and depending on the type of carrier 300, the trolley may be a baby trolley, a pet trolley, a shopping trolley, or the like. Of course, in alternative embodiments, the wheeled transportation device 1000 may be another type of product.

[0249] 50 and 51, in this embodiment, the structure of frame 100 is substantially symmetrical. Frame 100 may include, for example, a front support rod 11, a rear support rod 12, an upper support rod 13, a handlebar 14, and a connection assembly 15. Frame 100 can be folded into an unfolded state (FIG. 50) and a folded state (FIG. 53).

[0250] Referring to FIG. 50, the front support rod 11 has, for example, a U-shaped structure and includes two bars 111 located on both the left and right sides and a first cross bar 101 connected between the two bars 111. The first cross bar 101 extends along a first direction F1, which corresponds to the left-right direction. At least one front wheel mounting portion 193 is attached to the bottom of the front support rod 11. In this embodiment, two front wheel mounting portions 193 are attached to the bottom of the front support rod 11, and the two front wheel mounting portions 193 are spaced apart in the left-right direction. Each front wheel mounting portion 193 is used to mount a front wheel 191, and the front wheels 191 may be swivel wheels or non-swivel wheels. Of course, in alternative embodiments, the front support rod 11 may further have other embodiments, for example, the front support rod 11 may have a V-shaped structure or an I-shaped structure, and the bottom of the front support rod 11 may have one front wheel mounting portion 193 attached to the center.

[0251] The rear support rod 12 has, for example, a U-shaped structure and includes two bars 121 located on both the left and right sides and a rear cross bar 122 connected between the two bars 121. The upper end of each bar 121 is pivotally connected to the upper end of each bar 111 of the front support rod 11 on the same side, for example, by a pivot portion 118. Two rear wheel mounting portions 193 are attached to the rear support rod 12, spaced apart in the left-right direction. Each rear wheel mounting portion 193 is used to mount a rear wheel 192, which may be a swivel wheel or a non-swivel wheel. In this embodiment, the size of the rear wheels 192 is larger than the size of the front wheels 191 so that the overall structure of the wheeled transportation device 1000 is more stable. Of course, in an alternative embodiment, the size of the rear wheels 192 may be the same as the size of the front wheels 191.

[0252] The upper support rod 13 includes two bars 131 located on both the left and right sides, with the lower ends of each bar 131 pivotally connected to the pivot portions 118 on the same side, and the upper ends of each bar 131 connected to the handlebar 14. In one embodiment, the handlebar 14 has, for example, a U-shaped structure and includes two bars 141 located on both the left and right sides, with the lower ends of each bar 141 pivotally connected to the bar 131 of the upper support rod 13 on the same side, for example, via pivot portions 117. In some alternative embodiments, the two bars 141 of the handlebar 14 are connected to the two bars 131 via, for example, a telescoping structure, allowing the height of the handlebar 14 to be changed. A storage rack 140 for storing small items is attached to the handlebar 14, and the storage rack 140 has a storage cavity 1401 for storing, for example, cups or other items.

[0253] The connection assembly 15 is connected to the front support rod 11, the rear support rod 12, and the upper support rod 13, respectively. When the frame 100 is folded, the front support rod 11, the rear support rod 12, and the upper support rod 13 can be folded synchronously by the action of the connection assembly 15. In this embodiment, the engagement base assembly 200 is connected to the connection assembly 15 and attached to the frame 100. When the connection assembly 15 is unfolded, it corresponds to the unfolding of the engagement base assembly 200 and the unfolding of the frame 100. When the connection assembly 15 is folded, it corresponds to the folding of the engagement base assembly 200 and the folding of the frame 100.

[0254] 50 shows an embodiment of the connection assembly 15. The connection assembly 15 includes, for example, a first coupling member 151, an auxiliary support member 152, and a linkage member 153.

[0255] The first connecting member 151 includes two first tubes 1511 located on both the left and right sides, and the front end of each first tube 1511 is pivotally attached to the first pivot point O1 of the bar 111 of the front support rod 11 on the same side.

[0256] The auxiliary support member 152 has, for example, a U-shaped structure and includes two second tubes 1521 located on both the left and right sides and a second crossbar 1502 connected between the two second tubes 1521. In this embodiment, the second crossbar 1502 is connected to the rear ends of the two second tubes 1521 and extends in the left-right direction. The front end of each second tube 1521 is pivotally connected to a second pivot point O2 at the rear end of the first tube 1511 on the same side, and each second tube 1521 is also pivotally connected to a third pivot point O3 on the bar 121 of the rear support rod 12 on the same side. The second crossbar 1502 is located behind the first crossbar 101, and the second crossbar 1502 and the first crossbar 101 are spaced a predetermined distance apart in the second direction F2. The second direction F2 corresponds to the front-rear direction, and is approximately perpendicular to the first direction F1.

[0257] The linkage member 153 includes two tubes 1531 located on both the left and right sides. The upper end of each tube 1531 is pivotally connected to the fourth pivot point O4 of the bar 131 on the same side, and the lower end of each tube 1531 is pivotally connected to the fifth pivot point O5 of the second tube 1521 on the same side. In this embodiment, each tube 1531 has an S-shaped structure so as not to interfere with other components when the frame 100 is folded. Of course, in alternative embodiments, the structure of each tube 1531 is not limited to the S-shape, and each tube 1531 may be designed to have any appropriate structure as needed.

[0258] 50, when the frame 100 is in the unfolded state, the first connecting member 151 and the auxiliary support member 152 are unfolded and arranged substantially horizontally, the second pivot point O2 is located between the first pivot point O1 and the third pivot point O3, the third pivot point O3 is located between the second pivot point O2 and the second crossbar 1502, and the fifth pivot point O5 is located between the second pivot point O2 and the third pivot point O3. Referring to the perspective views of the folding process of the frame 100 shown in FIGS. 52 and 53, when the frame 100 is in the folded state, the first connecting member 151 and the auxiliary support member 152 are folded. Specifically, during the process of folding the frame 100, the angle α between the first connecting member 151 and the auxiliary support member 152 changes from approximately 180 degrees to less than 90 degrees (as shown in Figure 53, when the frame 100 is fully folded, the angle α becomes less than 90 degrees).

[0259] 52, when the frame 100 of this embodiment needs to be stored, the handlebar 14 is rotated about the pivot portion 117 to fold relative to the upper support rod 13. The upper support rod 13 is rotated about the pivot portion 118 to approach the rear support rod 120. As the upper support rod 13 moves, the linkage member 153 drives the auxiliary support member 152 to rotate about the third pivot point O3, and rotates the first connecting member 151 about the second pivot point O2 relative to the auxiliary support member 152 to approach the auxiliary support member 152. The first connecting member 151 rotates the front support rod 11 and moves it closer to the rear support rod 12 until the frame 100 is in the folded state as shown in FIG. 53.

[0260] 54 to 59 show a cross-sectional view and a perspective view of a portion of the structure of the engagement table assembly 200 of this embodiment, and the engagement table assembly 200 has, for example, a bilaterally symmetrical structure. The engagement table assembly 200 includes a seat plate assembly 2 and a locking mechanism 21 attached to the seat plate assembly 2. The seat plate assembly 2 includes, for example, an upper housing 201 and a lower housing 202, and the upper housing 201 and the lower housing 202 may be fastened together and fixed by fasteners (e.g., screws or bolts) not shown. A space for accommodating the locking mechanism 21 is defined between the upper housing 201 and the lower housing 202.

[0261] 50 and 51, the seat plate assembly 2 of the engagement base assembly 200 is attached to the connection assembly 15 of the frame 100 and extends in the left-right direction (first direction F1). The seat plate assembly 2 of the engagement base assembly 200 is located between the first cross bar 101 and the second cross bar 1502; that is, the seat plate assembly 2 of the engagement base assembly 200 is spaced a predetermined distance from the first cross bar 101 and the second cross bar 1502 in the front-rear direction (second direction F2). Referring to FIGS. 50 and 54, in an embodiment, sleeves 2010, for example, may be provided on both the left and right ends of the upper housing 201, and each sleeve 2010 may be fitted onto the exterior of the adjacent first tube 1511. The first tube 1511 and the second tube 1521 have sleeves 2010 drilled into the pivot shaft at the second pivot point O2, preventing the engagement base assembly 200 from sliding back and forth along the first connecting member 151. When the frame 100 is folded, the engagement base assembly 200 can move to the folded position together with the first connecting member 151. In an alternative embodiment, sleeves may be provided on both the left and right ends of the lower housing 202 to fit onto the two first tubes 1511, or the upper housing 201 and the lower housing 202 may be butted together to form the sleeves.

[0262] Referring to FIG. 51, the engagement platform assembly 200 has two engagement passages 22 (e.g., recesses formed in the upper housing 201) extending in the front-rear direction (second direction F2). The two engagement passages 22 are spaced apart and arranged side by side in the left-right direction (first direction F1). The two engagement passages 22 engage with engagement members 311 (see FIG. 58) of the carrier 300. The type of carrier 300 is not limited here. The carrier 300 shown in FIG. 49 may be the bottom structure of a product shelf, a stretcher, or a container that does not show a complete structure (e.g., a baby carriage or a pet box). The bottom of the carrier 300 includes an engagement member 311, which may be formed, for example, as two opposing bars having a ring structure, or may be formed by two or more bars that are independent of each other. Of course, the embodiment of the engagement member 311 is not limited thereto. The engagement member 311 engages with the engagement passage 22 and can be locked in the engagement passage 22 by the locking mechanism 21. Cooperation between the engagement member 311 and the engagement passage 22 can restrict left-right movement of the carrier 300 relative to the engagement table assembly 200.

[0263] According to the wheeled transport device 1000 of an embodiment of the present invention, the frame 100 can be connected to multiple different types of carriers 300 via the engagement platform assembly 200, thereby expanding the versatility of the frame 100 and enabling the wheeled transport device 1000 to provide multiple functions and meet the needs of users.

[0264] Referring to the cross-sectional view of FIG. 60, a positioning mechanism 400 is provided between the engaging table assembly 200 and the carrier 300. The positioning mechanism 400 restricts movement of the carrier 300 in the front-rear direction (second direction F2) relative to the engaging table assembly 200. The positioning mechanism 400 includes, for example, a third positioning protrusion 431 (see FIGS. 51 and 54) formed on the upper housing 201 of the seat plate assembly 2 of the engaging table assembly 200, and the third positioning protrusion 431 extends in the left-right direction (first direction F1). The third positioning protrusion 431 engages with a groove 430 on the bottom of the carrier 300 (for example, by engaging in a recess-projection manner). Of course, the embodiment of the positioning mechanism 400 is not limited to the above example, and any mechanism may be used as long as it restricts movement of the carrier 300 in the front-rear direction relative to the engaging table assembly 200. For example, in an alternative embodiment, a recess extending in the left-right direction is provided in the upper housing 201 of the engagement table assembly 200, and a positioning protrusion extending in the left-right direction is provided in the carrier 300, and the recess engages with the positioning protrusion. Also, in an alternative embodiment, the positioning mechanism 400 may be provided between the carrier 300 and the frame 100. In the alternative embodiment, the positioning mechanism 400 is provided between the carrier 300 and the frame 100 and between the carrier 300 and the engagement table assembly 200.

[0265] 60 , the first cross bar 101, the engagement base assembly 200, and the second cross bar 1502 cooperate to support the carrier 300. The first cross bar 101 is advantageous in preventing the carrier 300 from tipping forward relative to the engagement base assembly 200, while the second cross bar 1502 helps to prevent the carrier 300 from tipping backward relative to the engagement base assembly 200 and provides more secure support to the carrier 300.

[0266] Of course, in an alternative embodiment, one of the first crossbar 101 and the second crossbar 1502 cooperates with the engagement platform assembly 200 to support the carrier 300, while the other does not support the carrier 300. The first crossbar 101 or the second crossbar 1502 supporting the carrier 300 can be removably engaged with the carrier 300 via an engagement structure, preventing the carrier 300 from being easily separated from the first crossbar 101 or the second crossbar 1502. In an embodiment, the engagement structure can include, for example, an engagement hook extending downward from the carrier 300, which engages with the first crossbar 101 or the second crossbar 1502 and restricts the first crossbar 101 or the second crossbar 1502 between the hook body of the engagement hook and the carrier 300. In some embodiments, the engagement structure may further restrict forward and backward movement of the carrier 300 relative to the engagement platform assembly 200, and the positioning mechanism 400 may include the engagement structure. Note that in some embodiments where the first crossbar 101 and the second crossbar 1502 both support the carrier 300, the first crossbar 101 and the second crossbar 1502 may both be releasably engaged with the carrier 300 by the engagement structure (e.g., the engagement hooks described above).

[0267] In an embodiment not shown, when the first crossbar 101 is used to support the carrier 300, the carrier 300 and the first crossbar 101 are respectively provided with a first groove extending in the left-right direction and a first positioning protrusion, and engagement between the first groove and the first positioning protrusion (e.g., engagement in a concave-convex manner) can limit movement of the carrier 300 in the second direction F2 relative to the engaging base assembly 200. When the second crossbar 1502 is used to support the carrier 300, the carrier 300 and the second crossbar 1502 are respectively provided with a second groove extending in the left-right direction and a second positioning protrusion, and engagement between the second groove and the second positioning protrusion (e.g., engagement in a concave-convex manner) can limit movement of the carrier 300 in the second direction F2 relative to the engaging base assembly 200. The positioning mechanism 400 includes the above-mentioned first groove and first positioning protrusion, and second groove and second positioning protrusion.

[0268] 51 and 60, the first crossbar 101 may further be attached with a first abutment member 103 that abuts against the carrier 300. The first abutment member 103 may be, for example, a plastic sheet attached to the first crossbar 101, and the first abutment member 103 may have, for example, an anti-slip effect. The second crossbar 1502 may further be attached with a second abutment member 1503 that abuts against the carrier 300. The second abutment member 1503 may be, for example, a rubber sleeve attached to the second crossbar 1502, and the second abutment member 1503 may have, for example, an anti-slip effect.

[0269] In an embodiment not shown, the position of the second crossbar 1502 in the front-to-rear direction is adjustable to suitably support different sizes of carriers 300. More specifically, both ends of the second crossbar 1502 are connected to, for example, two second tubes 1521 (see FIG. 50 ) respectively by an elastic structure, making it possible to adjust the position of the second crossbar 1502 in the front-to-rear direction.

[0270] 51 and 54 to 59, an exemplary embodiment of the locking mechanism 21 is shown. The locking mechanism 21 includes two locking members 211, which are attached to the seat plate assembly 2 and are slidable in the left-right direction (first direction F1). The two locking members 211 correspond one-to-one to the two engagement passages 22, and each locking member 211 has a locked position and an unlocked position. Referring to FIG. 54, taking one of the locking members 211 as an example, when the locking member 211 is in the locked position, the engaging portion 2111 (e.g., a bolt) of the locking member 211 protrudes into the corresponding engagement passage 22 to lock the corresponding engagement member 311, and the engagement member 311 cannot be removed from the engagement passage 22. Referring to FIG. 58, when the locking member 211 is in the unlocked position, the engaging portion 2111 of the locking member 211 resets the corresponding engaging member 311 against the corresponding engaging passage 22, allowing the engaging member 311 to be removed from the engaging passage 22, thereby allowing the carrier 300 to move away from the frame 100.

[0271] 54 and 58, in this embodiment, the two locking members 211 move in opposite directions in the left-right direction to unlock or lock the engaging member 311. In this embodiment, an exemplary structure for unlocking the two locking members 211 is shown.

[0272] 49 and 50, an unlocking operation unit 212 is attached to each of the two wheel mounting portions (more specifically, the front wheel mounting portion 193) on the left and right sides of the frame 100, and the two locking members 211 are driven and unlocked by the unlocking operation unit 212. Referring to the partial cross-sectional view shown in FIG. 61, each unlocking operation unit 212 slides into and engages with a slide passage 1930 of the front wheel mounting portion 193. Referring to FIGS. 50, 55, 56, and 61, the two unlocking operation units 212 are connected to the two locking members 211 in the engagement base assembly 200 via two towing ropes 214, and each towing rope 214 extends inside the front wheel mounting portion 193 of the frame 100, the front support rod 11, and the tubular body of the first coupling member 151, and then enters the inside of the engagement base assembly 200. To facilitate the arrangement of the towing rope 214, the unlocking operation portion 212 of the left front wheel mounting portion 193 of the frame 100 is connected to the right locking member 211 of the engagement base assembly 200, and the unlocking operation portion 212 of the right front wheel mounting portion 193 of the frame 100 is connected to the left locking member 211 of the engagement base assembly 200. In this manner, when the next unlocking operation portion 212 is pressed, the towing rope 214 pulls and moves the corresponding locking member 211, causing the locking member 211 to unlock from the corresponding engagement member 311. In an embodiment, a resetting member 195 (see FIG. 61 ) that resets the unlocking operation portion 212 may be further attached to the front wheel mounting portion 193, and the resetting member may be, for example, a spring.

[0273] 49, the unlock operation unit 212 may have an unlock identification area 2121 that allows the user to determine whether the locking member 211 is in the unlocked position. The unlock identification area 2121 is, for example, a patch (e.g., green) located on the unlock operation unit 212. More specifically, when the unlock operation unit 212 is not pressed, the locking member 211 is in the locked position, and the unlock identification area 2121 is located outside the front wheel mounting portion 193 and is visible. When the unlock operation unit 212 is pressed, the locking member 211 is in the unlocked position, and the unlock identification area 2121 slides inside the front wheel mounting portion 193 and is not visible. By looking at the unlock identification area 2121, the user can easily determine whether the locking member 211 is in the locked position or the unlocked position.

[0274] 55, each towing rope 214 is, for example, a wire rope. For example, a first end of each towing rope 214 is connected to a corresponding unlocking operation unit 212, and the other end is connected to a corresponding locking member 211. At least one guide mechanism 16 for guiding the towing rope 214 may be provided inside the frame 100. As shown in FIG. 61, the guide mechanism 16 includes, for example, a rotating member 161 provided adjacent to the unlocking operation unit 212 and another guide structure provided inside the frame tube. The other guide structure includes, for example, a guide bracket 162 (see FIG. 61) provided inside the frame 100 (e.g., in the front support rod 11) and a guide bracket 163 (see FIG. 55) provided inside the engagement base assembly 200. More specifically, the rotating member 161 is installed within the front wheel mounting portion 193. The towing rope 214 passes through the rotating member 161 and then passes through a hole 1933 in the front wheel mounting portion 193 to enter the front support rod 11. The rotating member 161 can prevent unnecessary friction between the towing rope 214 and other structures. The rotating member 161 may be formed, for example, by a rotatable rivet or pin shaft. Referring to FIGS. 55 and 61 , the guide brackets 162 and 163 may be provided at a curved portion of the towing rope 214. In an embodiment, the towing rope 214 is wrapped in a sheath 2140, and the guide brackets 162 and 163 may be used to secure the sheath 2140 of the towing rope 214.

[0275] 54 to 56, the engagement base assembly 200 may further include an elastic device 24 that drives each locking member 211 to reset it to the locked position. In an embodiment, the elastic device 24 may include a spring provided between the two locking members 211, or the elastic device 24 may include a spring provided between each locking member 211 and the seat plate assembly 2 (e.g., the upper housing 201 or the lower housing 202). When each locking member 211 moves to the unlocked position, the spring of the elastic device 24 is compressed. Referring to FIG. 54, the locking portion 2111 of each locking member 211 may have an inclined surface 2112, and the locking portion 2111 can move from the locked position to the unlocked position after the inclined surface 2112 is pressed, thereby allowing the engagement member 311 to enter the engagement passage 22 without operating the unlocking operation portion 212.

[0276] 62 and 63 show side views of the two locking members 211 and linkage assembly 25 of the engagement table assembly 200. In this embodiment, the two locking members 211 are connected by the linkage assembly 25 located therebetween, and the two locking members 211 can move synchronously to the unlocked position or the locked position. This allows the two locking members 211 to be locked simultaneously by operating only one of the unlocking operation portions 212.

[0277] 62 and 63, the linkage assembly 25 may be a four-bar link mechanism. Specifically, the four-bar link mechanism includes a first link rod 251, a second link rod 252, a third link rod 253, and a fourth link rod 254. The first link rod 251 and the second link rod 252 are pivotally connected by a pivot shaft A1, the third link rod 253 and the fourth link rod 254 are pivotally connected by a pivot shaft A2, the first link rod 251 and the third link rod 253 are pivotally connected by a pivot shaft A3, and the second link rod 252 and the fourth link rod 254 are pivotally connected by a pivot shaft A4. The four-bar link mechanism is a parallel four-bar link mechanism, in which the first link rod 251 and the fourth link rod 254 are parallel to each other, and the second link rod 252 and the third link rod 253 are parallel to each other. One of the diagonally arranged pivot shafts A1 and A2 is a fixed pivot shaft fixedly connected to the seat plate assembly 2 (e.g., the upper housing 201 or the lower housing 202), and the other is a movable pivot shaft. Two links pivotally connected to the movable pivot shaft are pivotally connected to two lock members 211 via pivot shafts A5 and A6, respectively.

[0278] In this embodiment, pivot shaft A1 is a fixed pivot shaft, pivot shaft A2 is a movable pivot shaft, pivot shaft A3 is located between pivot shaft A2 and pivot shaft A5, and pivot shaft A4 is located between pivot shaft A2 and pivot shaft A6. Referring to FIG. 63, when any of the locking members 211 is driven by the corresponding unlocking operation unit 212 to move to the unlocked position, the linkage assembly 25 deforms and synchronously moves the other locking member 211 to the unlocked position. Similarly, when any of the locking members 211 is driven by the elastic device 24 to move to the locked position, the linkage assembly 25 drives the other locking member 211 to move to the locked position synchronously. Of course, the configuration of the linkage assembly 25 is not limited to the four-bar link mechanism described above, and any configuration is possible as long as it can move the locking members 211 connected by the linkage assembly 25 synchronously.

[0279] By providing the linkage assembly 25, for example, by operating one of the lock release operating units 212 in a pressing manner, the two lock members 211 can be locked simultaneously. In the embodiment, by providing the linkage assembly 25, the number of lock release operating units 212 can be less than the number of lock members 211, and for example, it is possible to simultaneously lock the two lock members 211 by providing only one lock release operating unit 212. Furthermore, by providing the linkage assembly 25, the elastic device 24 can include only a spring provided between one lock member 211 and the seat plate assembly 2 (e.g., the upper housing 201 or the lower housing 202), and can synchronously drive the two lock members 211 to reset them to the locked position.

[0280] 54 to 59 , the engagement base assembly 200 may further include a retention mechanism 23 corresponding to each of the two locking members 211. When each locking member 211 is driven to the unlocked position by the unlocking operation portion 212, each retention mechanism 23 can lock the corresponding locking member 211 in the unlocked position. In this manner, after a user presses the unlocking operation portion 212 once, the locking member 211 is locked in the unlocked position by the retention mechanism 23. Even if the user releases the pressure on the unlocking operation portion 212, the locking member 211 is retained in the unlocked position. Thereafter, the user can easily remove the carrier 300 from the frame 100 by simply lifting the moving carrier 300 upward. As described above, in an alternative embodiment, the retention mechanism 23 can be disposed for only one of the two locking members 211, and the retention mechanism 23 can simultaneously lock both locking members 211 in the unlocked position through the action of the linkage assembly 25.

[0281] 54 to 59, the holding mechanism 23 in this embodiment includes, for example, a movable member 231, a first buckle portion 2301, a second buckle portion 232, and a reset device (referred to as a reset member) 236.

[0282] 54, the movable member 231 is attached to a slide passage 220 that communicates with the engagement passage 22, and the slide passage 220 is located below the engagement passage 22. The movable member 231 has an abutting end 2311 that extends into the engagement passage 22, and an engaging end 2312 that is spaced apart from the abutting end 2311. The abutting end 2311 abuts against the engagement member 311, and the engagement member 311 located in the engagement passage 22 presses the abutting end 2311 from the engagement passage 22 into the slide passage 220. The first buckle portion 2301 is attached to the engaging end 2312. The first buckle portion 2301 is, for example, an engagement groove.

[0283] 55, the second buckle portion 232 is provided on the locking member 211. Referring to Fig. 57, in this embodiment, an elastic arm 213 is attached to the locking member 211, and the elastic arm 213 extends in the left-right direction to the vicinity of the abutting end 2311 of the movable member 231, and the second buckle portion 232 is attached to the elastic arm 213. The second buckle portion 232 includes, for example, a wedge-shaped step formed in the elastic arm 213.

[0284] 57 and 58 , in this embodiment, the resilient arm 213 is fixed to the locking member 211 by, for example, a fastener 2131, and the fastener 2131 is, for example, a screw. A rotation prevention structure 26 may be further provided between the resilient arm 213 and the locking member 211 to prevent relative rotation therebetween. The rotation prevention structure 26 can be embodied in various ways, and this embodiment shows an exemplary embodiment of the rotation prevention structure 26. More specifically, the rotation prevention structure 26 includes a rotation prevention block 261 and a rotation prevention groove 262, one of which is provided on the wall of the resilient arm 213 and is disengaged from the fastener 2131, and the other is provided on the locking member 211. The rotation prevention block 261 and the rotation prevention groove 262 engage with each other to restrict the resilient arm 213 from pivoting relative to the fastener 2131 with respect to the locking member 211. In an alternative embodiment, the resilient arm 213 may be integrally formed with the locking member 211.

[0285] The reset device 236 drives the abutment end 2311 of the movable member 231 to move into the engagement passage 22. In an embodiment, the reset device 236 includes, for example, a spring provided between the movable member 231 and the lower housing 202 of the seat plate assembly 2. In an embodiment, the movable member 231 has, for example, a chamber 2310 that houses the reset device 236 (see FIG. 58).

[0286] The following describes the operation process of the holding mechanism 23 that engages with the locking member 211 when the position of any of the locking members 211 changes, with reference to Figures 54, 58 and 59.

[0287] Referring to Figure 54, when the carrier 300 is fixed to the frame 100, the engagement member 311 is locked in the engagement passage 22 by the locking member 211, and the movable member 231 is pushed by the engagement member 311 to move downward along the slide passage 220, moving the first buckle portion 2301 onto the movement path of the second buckle portion 232.

[0288] 58, when it is necessary to remove the carrier 300 from the frame 100, the unlocking operation portion 212 is pressed, and the unlocking operation portion 212 drives the locking member 211 to move to the unlocked position, and the second buckle portion 232 compresses the elastic device 24 as the locking member 211 moves. When the second buckle portion 232 abuts against the engaging end 2312 of the movable member 231, the elastic arm 213 elastically deforms, allowing the locking member 211 to continue moving. After the locking member 211 moves to the unlocked position, the second buckle portion 232 faces the first buckle portion 2301, and at this time, the elastic arm 213 elastically rebounds, and the second buckle portion 232 engages with the first buckle portion 2301. At this time, even if the unlocking operation unit 212 is released, the elastic device 24 cannot drive the locking member 211 to the unlocked position due to the engagement between the second buckle unit 232 and the first buckle unit 2301, and the locking member 211 is locked in the unlocked position by the holding mechanism 23. At this time, the user can directly lift the carrier 300 upward without continuing to press the unlocking operation unit 212, and can remove the carrier 300 from the frame 100.

[0289] 59, after the carrier 300 is removed from the frame 100, the engaging member 311 moves away from the engaging passage 22 and does not abut against the abutting end 2311 of the movable member 231, and the movable member 231 is reset by driving the reset device 236, and the abutting end 2311 moves upward and protrudes into the engaging passage 22. At the same time, the first buckle portion 2301 moves out of the movement path of the second buckle portion 232 as the movable member 231 moves, and the locking member 211 is reset to the locked position by the elastic device 24.

[0290] In alternative embodiments, the retaining mechanism 23 may have more embodiments and is not limited to the above examples. For example, in alternative embodiments, the first buckle portion 2301 may be a wedge-shaped step provided on the engaging end 2312 of the movable member 231, and the second buckle portion 232 may be an engagement groove provided on the elastic arm 213.

[0291] In an embodiment not shown, the wheeled transportation device 1000 according to the above embodiment of the present invention may be modified as follows.

[0292] 1: In an alternative embodiment, the frame 100 may have a non-foldable structure, and the connection assembly 15 to which the engagement base assembly 200 is attached may have a different embodiment accordingly. For example, the connection assembly 15 may include two non-foldable tubes located on both the left and right sides. These two tubes extend along the front-to-rear direction and are connected to the bars 111 and 121 on the same side, respectively, so that the tubes of the connection assembly 15 and the bars 111 and 121 on the same side form a stable triangle. The left and right ends of the engagement base assembly 200 may be fitted to the two tubes of the connection assembly 15 and then secured by fasteners, or the left and right ends of the engagement base assembly 200 may be secured directly to the two tubes of the connection assembly 15 by fasteners (bolts or screws). The engagement base assembly 200 is located between the first crossbar 101 and the rear crossbar 122.

[0293] 2: In an alternative embodiment, the auxiliary support member 152 does not have to have the second crossbar 1502 connected between the two second tubes 1521 on both the left and right sides. By rationally setting the height of the rear crossbar 122 of the rear support rod 12, the rear crossbar 122 can be used as a second crossbar that cooperates with the engagement base assembly 200 to support the carrier 300.

[0294] 3: In an alternative embodiment, the second crossbar 1502 of the auxiliary support member 152 that supports the carrier 300 does not have to be provided at the rear ends of the two second tubes 1521. For example, the connection position between the second crossbar 1502 and each second tube 1521 may be located between the second pivot point O2 and the third pivot point O3, and the second crossbar 1502 and the engagement base assembly 200 may be spaced apart by a predetermined distance in the front-to-rear direction (second direction F2).

[0295] 4: In an alternative embodiment, both ends of the engagement table assembly 200 do not have to be attached to the two first tubes 1511 of the first coupling member 151. For example, both ends of the engagement table assembly 200 are connected to the two second tubes 1521 of the auxiliary support member 152, respectively.

[0296] 5: In an alternative embodiment, the number of engagement passages 22 in the engagement table assembly 200 is not limited to two, and may be one or more (including two). For example, the multiple engagement passages 22 may be arranged in a line in the left-right direction, in a line in the front-rear direction, or in multiple lines in the left-right and front-rear directions.

[0297] 6: In an alternative embodiment, the multiple locking members 211 that engage with the multiple engagement passages 22 in the same row have the same movement direction when unlocking or locking the engagement members 311. For example, the multiple locking members 211 that engage with the multiple engagement passages in the same row may be arranged in a row, and the locking members 211 in the same row may be connected to the same sliding member located in the seat plate assembly 2. In this way, there is no need to provide a linkage assembly 25, and the multiple locking members 211 can be moved simultaneously to the unlocked position by driving the sliding member with the same unlocking operation unit 212.

[0298] 7: The installation location of the unlocking operation unit 212 is not limited to the front wheel mounting portion 193. In an alternative embodiment, the unlocking operation unit 212 may be installed on the rear wheel mounting portion 193 or another suitable location, and the unlocking operation unit 212 controls the unlocking of the locking member 211 via the towing rope 214. Also, in an alternative embodiment, the unlocking operation unit 212 may be integral with or molded integrally with the locking member 211.

[0299] 8: In this embodiment, the wheeled transport device 1000 includes a frame 100, an engagement table assembly 200, and a carrier 300. However, as described above, the carrier 300 is detachable from the engagement table assembly 200. Therefore, a wheeled transport device 1000 that does not include the carrier 300 also falls within the scope of the present application.

[0300] 64 to 66, the structure of a storage rack 140 attached to the handlebar 14 of the frame 100 in some variations of wheeled transportation devices is shown. The storage rack 140 has a storage cavity 1401 for storing, for example, cups or other items. The storage cavity 1401 may have different cross-sectional shapes depending on the items to be stored. For example, the storage cavity 1401 may have a rectangular cross-section for storing a cell phone, and the storage cavity 1401 may have a circular cross-section for storing a cup.

[0301] In an embodiment, at least one clamping portion 1402 extending inward is provided at the opening of the storage cavity 1401, and the clamping portion 1402 is made of, for example, an elastic material. When an object is placed in the storage cavity 1401, the clamping portion 1402 abuts against the object, preventing the object from moving back and forth in the storage cavity 1401 and preventing the object from easily falling out of the storage cavity 1401. The shape of the clamping portion 1402 of the present invention is not particularly limited as long as it can abut against the object and clamp the object at the opening of the storage cavity 1401. For example, in an embodiment, multiple clamping portions 1402 may be uniformly provided around the opening of the storage cavity 1401, and each clamping portion 1402 may have, for example, an arc-like shape. In an embodiment, a long clamping portion 1402 may be provided at a portion of the opening of the storage cavity 1401.

[0302] 66 , in an embodiment, the clamping portion 1402 is formed on, for example, an annular member 1403, which may be formed of any suitable material. The annular member 1403 may be fixed to a fixed ring 1404 by overmolding, and the fixed ring 1404 may be fixed to the annular step 14011 at the opening of the receiving cavity 1401 in any suitable manner. In an embodiment, the annular member 1403 may be made of, but is not limited to, a thermoplastic elastomer (TPE) material. The fixed ring 1404 may be made of a polypropylene (PP) material, and the hardness of the fixed ring 1404 is greater than that of the annular member 1403. The fixed ring 1404 may be fixed to the annular step 14011 by, for example, crimping or vibration welding. Of course, the clamping portion 1402 is not limited to being fixed by the fixing ring 1404, but may be fixed to the opening of the storage cavity 1401 in any other suitable manner to clamp an object.

[0303] Fourth Example

[0304] FIG. 67 shows a perspective view of a wheeled transportation device 1000 according to a fourth embodiment of the present invention, which may include a frame 100, an engagement platform assembly 200, and a carrier 300. The wheeled transportation device 1000 includes a support assembly according to an embodiment of the present invention, and the support assembly will be described below together with the wheeled transportation device 1000. In the embodiment shown in FIG. 67, the wheeled transportation device 1000 is described as a trolley by way of example; depending on the type of carrier 300, the cart may be a baby trolley, a pet trolley, a shopping trolley, or the like. Of course, in alternative embodiments, the wheeled transportation device 1000 may be another type of product.

[0305] Referring to the structure of frame 100 shown in Figure 68, in this embodiment, the structure of frame 100 is substantially symmetrical. Frame 100 may include, for example, front support rods 11, rear support rods 12, upper support rods 13, handlebars 14, and connection assemblies 15. Frame 100 can be folded to have an unfolded state (see Figures 68 and 70) and a folded state (see Figures 72 and 73).

[0306] Referring to Figure 68, the front support rod 11 has, for example, a U-shaped structure and includes a first cross bar 101 and two bars 111. At least one front wheel mounting portion 193 for mounting a front wheel 191 is attached to the bottom of the front support rod 11. Unless inconsistent, the description of the third embodiment above can be referred to for the structures of the front support rod 11, the front wheel mounting portion 193, and the front wheel 191. In this embodiment, the two front wheel mounting portions 193 are attached to both left and right ends of the first cross bar 101, and the two bars 111 are each connected to the front wheel mounting portion 193 on the same side.

[0307] The rear support rod 12 has, for example, a U-shaped structure and includes a rear cross bar 122 and two bars 121. The upper end of each bar 121 is pivotally connected to the upper end of each bar 111 of the front support rod 11 on the same side, for example, by a pivot portion 118. Two rear wheel mounting portions 193 are attached to the rear support rod 12, and each rear wheel mounting portion 193 is used to mount a respective rear wheel 192. Unless inconsistent, the structures of the rear support rod 12, the rear wheel mounting portions 194, and the rear wheels 192 can refer to the description of the third embodiment above.

[0308] The upper support rod 13 includes two bars 131, the lower ends of which are pivotally connected to the pivot portions 118 on the same side, and the upper ends of which are connected to the handlebars 14. In this embodiment, the handlebars 14 have, for example, a U-shaped structure and include two bars 141, the lower ends of which are pivotally connected to the bar 131 of the upper support rod 13 on the same side via, for example, the pivot portions 117. A storage rack 140 for storing small items may be attached to the handlebars 14. Unless inconsistent, the structures of the upper support rod 13, the handlebars 14, and the storage rack 140 may refer to the description of the third embodiment above.

[0309] The connection assemblies 15 are connected to the front support rods 11, the rear support rods 12, and the upper support rods 13, respectively. When the frame 100 is folded, the front support rods 11, the rear support rods 12, and the upper support rods 13 can be folded synchronously by the action of the connection assemblies 15. Figures 68 and 69 show an embodiment of the connection assembly 15. The connection assembly 15 includes, for example, a first coupling member (also referred to as a first support frame) 151, an auxiliary support member (also referred to as a second support frame) 152, and a linkage member 153.

[0310] The first connecting member 151 includes two first tubes 1511 located on both the left and right sides, the two first tubes 1511 being parallel to each other, and the front end of each first tube 1511 is pivotally connected to a first pivot point O1 of the bar 111 of the front support rod 11 on the same side.

[0311] The auxiliary support member 152 includes two second tubes 1521 located on both the left and right sides, and the two second tubes 1521 are parallel to each other. The front end of each second tube 1521 is pivotally connected to a second pivot point O2 at the rear end of the first tube 1511 on the same side, forming a rotation axis XX at the second pivot point O2 (see FIG. 69). More specifically, the second tube 1521 and the first tube 1511 on the same side are pivotally connected by, for example, a pivot shaft 150, and the rotation axis XX is the center line of the pivot shaft 150 and is parallel to the first direction F1. Each second tube 1521 is also pivotally connected to a third pivot point O3 of the bar 121 of the rear support rod 12 on the same side. In an embodiment, the auxiliary support member 152 may further include an intermediate tube connected between the two first tubes 1511, and the auxiliary support member 152 is generally U-shaped.

[0312] The linkage member 153 includes two tubes 1531 located on both the left and right sides. The upper end of each tube 1531 is pivotally connected to the fourth pivot point O4 of the bar 131 on the same side, and the lower end of each tube 1531 is pivotally connected to the fifth pivot point O5 of the second tube 1521 on the same side. Each tube 1531 can be designed to have any appropriate structure as needed so as not to interfere with other components when the frame 100 is folded. For example, in an embodiment, each tube 1531 may have a bent or S-shaped structure.

[0313] 68 and 70, when frame 100 is in the unfolded state, first connecting member 151 and auxiliary support member 152 are unfolded and positioned substantially horizontally, and angle α between each first tube 1511 and the adjacent second tube 1521 on the same side is approximately 180 degrees. In an embodiment, when frame 100 is in the unfolded state, angle α formed between first connecting member 151 and auxiliary support member 152 may be an obtuse angle greater than 90 degrees. Continuing to refer to FIG. 68, when frame 100 is in the unfolded state, second pivot point O2 is located between first pivot point O1 and third pivot point O3, and fifth pivot point O5 is located between second pivot point O2 and third pivot point O3. Referring to Figures 72 and 73, when the frame 100 is in a folded state, the first connecting member 151 and the auxiliary support member 152 are also in a folded state, and the angle α between each first tube 1511 and the adjacent second tube 1521 on the same side is an acute angle.

[0314] 70 to 73 are perspective views showing the folding process of the frame 100. When the frame 100 of this embodiment needs to be stored, the handlebar 14 is rotated about the pivot portion 117 to fold it relative to the upper support rod 13. The upper support rod 13 rotates about the pivot portion 118 to approach the rear support rod 12. As the upper support rod 13 moves, the linkage member 153 drives the auxiliary support member 152 to rotate about the third pivot point O3, and rotates the first connecting member 151 about the second pivot point O2 relative to the auxiliary support member 152 to move it closer to the auxiliary support member 152. The angle α between each first tube 1511 of the first connecting member 151 and the adjacent second tube 1521 of the auxiliary support member 152 is changed from approximately 180 degrees to an acute angle less than 90 degrees (when the frame 100 is fully folded, as shown in FIG. 72, the angle α is less than 90 degrees). The first connecting member 151 rotates the front support rod 11 and moves it closer to the rear support rod 12 until the frame 100 is in the folded state as shown in FIGS. 72 and 73.

[0315] 68 and 69 show an embodiment of the engagement table assembly 200 of this embodiment. The engagement table assembly 200 includes a sheet plate assembly on which an object (more specifically, a carrier) is placed, and the sheet plate assembly includes a first sheet plate assembly 2A and a second sheet plate assembly 2B. The first sheet plate assembly 2A is attached to a first connecting member 151 and includes a locking mechanism (e.g., a first locking mechanism 21A). The second sheet plate assembly 2B is attached to an auxiliary support member 152 and includes a locking mechanism (e.g., a second locking mechanism 21B). As described above, the first connecting member 151 and the auxiliary support member 152 are pivotally connected by a pivot shaft 150, which has a rotation axis XX. This allows the first sheet plate assembly 2A and the second sheet plate assembly 2B to rotate relatively about the rotation axis XX, and the engagement table assembly 200 has an unfolded state and a folded state.

[0316] Referring to Fig. 68, when the frame 100 is in the unfolded state, the first connecting member 151 and the auxiliary support member 152 are in the unfolded state, and the engagement base assembly 200 is accordingly in the unfolded state. Referring to Figs. 67, 69, and 70, when the engagement base assembly 200 is in the unfolded state, the engagement base assembly 200 supports the carrier 300 and can lock the carrier 300 by the first locking mechanism 21A and the second locking mechanism 21B. Referring to Figs. 71 to 73, after the carrier 300 is detached from the frame 100, the frame 100 can be folded. When the frame 100 is in the folded state, the first connecting member 151 and the auxiliary support member 152 are in the folded state, and the engagement base assembly 200 is accordingly in the folded state. When the frame 100 and the engagement table assembly 200 transition from the unfolded state to the folded state, the first sheet plate assembly 2A and the second sheet plate assembly 2B approach each other in the front-to-rear direction. When the frame 100 and the engagement table assembly 200 transition from the folded state to the unfolded state, the first sheet plate assembly 2A and the second sheet plate assembly 2B are separated from each other in the front-to-rear direction.

[0317] The engagement base assembly 200 of the embodiment of the present invention can fold itself to reduce the internal space required for the folded frame 100. Referring to FIG. 73 , in this embodiment, the engagement base assembly 200 may be provided with a lifting handle 29, which may be provided, for example, on the first seat plate assembly 2A and / or the second seat plate assembly 2B, allowing a user to easily move the folded frame 100 via the lifting handle 29. More specifically, after the frame 100 is folded, the lifting handle 29 is located, for example, in the internal space of the frame created by the folded engagement base assembly 200 and does not protrude outward from the frame 100, thereby reducing the volume of packaging material and lowering transportation costs.

[0318] The support assembly according to an embodiment of the present invention may include the above-mentioned engaging base assembly 200, first connecting member 151, and auxiliary support member 152, and the first seat plate assembly 2A and the second seat plate assembly 2B are pivotally connected by the first connecting member 151 and the auxiliary support member 152. However, in actual application, the manner in which the first seat plate assembly 2A and the second seat plate assembly 2B are pivotally connected is not limited to the above example. For example, in an embodiment, the first connecting member 151 and the auxiliary support member 152 may not be provided, and the first seat plate assembly 2A and the second seat plate assembly 2B themselves may have sufficient structural strength, and may be directly pivotally connected by the pivot shaft 150, or directly pivotally connected to the corresponding front support rod 11 or rear support rod 12. As can be understood, in an embodiment in which the first seat plate assembly 2A and the second seat plate assembly 2B are directly pivotally connected by the pivot shaft 150, the support assembly may include the engagement base assembly 200 without including the first connecting member 151 and the auxiliary support member 152.

[0319] 69, in this embodiment, the first sheet plate assembly 2A is connected between two first tubes 1511 and extends in the left-right direction (first direction F1). The second sheet plate assembly 2B is connected between two second tubes 1521 and extends in the left-right direction (first direction F1). When the engagement table assembly 200 is in the unfolded state, the first sheet plate assembly 2A and the second sheet plate assembly 2B are spaced apart in the second direction F2. This second direction F2 corresponds to the front-rear direction, and the second direction F2 is non-parallel to the first direction F1; more specifically, the second direction F2 is approximately perpendicular to the first direction F1.

[0320] 70 and 71, in an embodiment, the first sheet plate assembly 2A is close to the pivot shaft 150, and the second sheet plate assembly 2B is spaced apart from the pivot shaft 150. Referring to FIG. 73, when the frame 100 is in the folded state, the engagement base assembly 200 is also in the folded state, and the first sheet plate assembly 2A and the second sheet plate assembly 2B are not positioned and overlap each other, which is advantageous in reducing the volume of the folded frame 100. Referring to FIG. 73, in an embodiment, after the frame 100 is folded, the second sheet plate assembly 2B is located above the first sheet plate assembly 2A, and the lifting handle 29 is provided on, for example, the second sheet plate assembly 2B.

[0321] 69 again, in an embodiment, a sleeve 2010 may be provided on each end of the first seat plate assembly 2A, and each sleeve 2010 may be fitted onto the exterior of the adjacent first tube 1511. A pivot shaft 150 is drilled into the sleeve 2010 so that the first seat plate assembly 2A cannot move back and forth along the first tube 1511. In an embodiment, the pivot shaft 150 may be a hollow shaft.

[0322] 69 , in this embodiment, the first seat plate assembly 2A and the second seat plate assembly 2B each include at least one engagement passage 22, and each engagement passage 22 extends in the front-to-rear direction (second direction F2). The first locking mechanism 21A and the second locking mechanism 21B each include at least one locking member 211, and each locking member 211 moves in the left-to-right direction (first direction F1) and has a locked position where it protrudes into the corresponding engagement passage 22 and an unlocked position where it retracts from the corresponding engagement passage 22. The movement direction of each locking member 211 is parallel to the rotation axis XX. When the locking member 211 is in the locked position, it can lock the carrier 300, and when the locking member 211 is in the unlocked position, it allows the carrier 300 to move from the engagement base assembly 200.

[0323] Continuing to refer to FIG. 69, in this embodiment, the engagement passage 22 in the first seat plate assembly 2A may be referred to as the first engagement passage 22A, and the engagement passage 22 in the second seat plate assembly 2B may be referred to as the second engagement passage 22B. Referring to FIGS. 69 and 74, the locking member 211 of the first locking mechanism 21A may be referred to as the first locking member 211A. Referring to FIGS. 69, 77, and 78, the locking member 211 of the second locking mechanism 21B may be referred to as the second locking member 211B. In this embodiment, the number of first engagement passages 22A and first locking members 211A may both be two, and the unlocking and locking directions of the two first locking members 211A may be opposite. The number of second engagement passages 22B and second locking members 211B may both be two, and the unlocking and locking directions of the two second locking members 211B may both be two. Of course, in alternative embodiments, the unlocking and locking directions of the two first locking members 211A may be the same, and the unlocking and locking directions of the two second locking members 211B may be the same.

[0324] 70 and 74, in an embodiment, the first sheet plate assembly 2A includes, for example, an upper housing 201 and a lower housing 202, the first engagement passage 22A is formed in the upper housing 201, and the first locking member 211A is located in a receiving cavity surrounded by the upper housing 201 and the lower housing 202. The sleeves 2010 are provided on, for example, both ends of the upper housing 201. Referring to FIGS. 77 and 78, in an embodiment, the second sheet plate assembly 2B includes, for example, an upper housing 203 and a lower housing 204, the second engagement passage 22B is formed in the upper housing 203, and the second locking member 211B is located in a receiving cavity surrounded by the upper housing 203 and the lower housing 204. Referring to FIG. 77, in an embodiment, lifting handle 29 may include, for example, an upper housing (not shown) and a lower housing 292, where the upper housing of lifting handle 29 may be attached to or integrally formed with upper housing 203, and lower housing 292 may be attached to or integrally formed with lower housing 204.

[0325] Unless inconsistent, the description of the carrier 300 can refer to the description of the third embodiment, and the bottom of the carrier 300 may be provided with, for example, an engagement member 311, which engages with each engagement channel 22 (the first engagement channel 22A and the second engagement channel 22B). Referring to Figures 67 to 69, when the carrier 300 is supported and locked on the engagement table assembly 200, grooves (not shown, see, for example, groove 430 in the third embodiment) on the bottom of the carrier 300 engage with the first sheet plate assembly 2A and the second sheet plate assembly 2B, respectively, to restrict movement of the carrier 300 in the front-to-rear direction (second direction F2). The engagement members 311 are engaged with the first engagement passage 22A and the second engagement passage 22B, respectively, and are locked by the first locking member 211A (FIG. 82) of the first locking mechanism 21A and the second locking member 211B (FIG. 78) of the second locking mechanism 21B, respectively, so that the carrier 300 cannot move in the left-right direction (first direction F1) and cannot be removed from the engagement base assembly 200. More specifically, referring to FIGS. 78 and 82, when each locking member 211 (first locking member 211A and second locking member 211B) is in the locked position, the engaging portion 2111 (e.g., a bolt) of each locking member 211 is inserted into the corresponding engagement passage 22 (first engagement passage 22A or second engagement passage 22B) to lock the corresponding engagement member 311, and the engagement member 311 cannot be removed from the engagement passage 22. When the two first locking members 211A move toward each other and the two second locking members 211B move toward each other and retreat from the corresponding engagement passages 22, each engagement member 311 is allowed to disengage from the corresponding engagement passage 22, and the carrier 300 can be disengaged from the engagement table assembly 200. The carrier 300 is detachably connected to the engagement table assembly 200, and the frame 100 can be used in cooperation with different types of carriers 300.

[0326] In alternative embodiments, the embodiment of the carrier 300 is not limited to the above examples, for example, the engagement member 311 at the bottom of the carrier 300 may be formed, for example, by two parallel opposing bars of a ring structure, or the engagement member 311 may be formed by four or more bars that are independent of each other.

[0327] 74, 75, and 76, in this embodiment, two first locking members 211A are connected by a first linkage assembly 25A, and the first linkage assembly 25A controls the two first locking members 211A to move synchronously, thereby switching the two first locking members 211A between their locked and unlocked positions synchronously. In this manner, an unlocking operation can be performed on either of the first locking members 211A, i.e., the other first locking member 211A can be locked simultaneously. Of course, when either of the first locking members 211A moves to the locked position, the other first locking member 211A moves to the locked position synchronously by the first linkage assembly 25A.

[0328] 74 and 76, the first linkage assembly 25A may be a four-bar linkage mechanism. Specifically, the four-bar linkage mechanism includes a first link rod 251, a second link rod 252, a third link rod 253, and a fourth link rod 254, and these links are pivotally connected by pivot shafts A1, A2, A3, and A4. Unless inconsistent, the structure of the first linkage assembly 25A can refer to the description of the linkage assembly 25 in the third embodiment above. One of the diagonally arranged pivot shafts A1 and A2 is a fixed pivot shaft fixedly connected to the seat plate assembly 2A (e.g., the upper housing 201 or the lower housing 202), and the other is a movable pivot shaft. The two link rods pivotally connected to the movable pivot shaft are pivotally connected to two locking members 211 (more specifically, the first locking member 211A) via pivot shafts A5 and A6, respectively.

[0329] In this embodiment, pivot shaft A1 is a fixed pivot shaft, pivot shaft A2 is a movable pivot shaft, pivot shaft A3 is located between pivot shaft A2 and pivot shaft A5, and pivot shaft A4 is located between pivot shaft A2 and pivot shaft A4. Referring to FIG. 76, when any of the first locking members 211A moves to the unlocked position, the first linkage assembly 25A is deformed, and the other first locking member 211A moves synchronously to the unlocked position. Similarly, when any of the first locking members 211A moves to the locked position, the first linkage assembly 25A moves the other first locking member 211A synchronously to the locked position. Of course, the configuration of the first linkage assembly 25A is not limited to the four-bar linkage mechanism described above, and any configuration that can synchronously move the first locking members 211A connected by the first linkage assembly 25A is sufficient.

[0330] In an embodiment not shown, the two second locking members 211B are connected by a second linkage assembly (not shown), and the second linkage assembly controls the two second locking members 211B to move synchronously, thereby synchronously switching the two second locking members 211B between their locked and unlocked positions. The structure of the second linkage assembly and its connection to the two second locking members 211B can refer to the structure of the first linkage assembly and its connection to the two first locking members 211A. That is, the two second locking members 211B have the same configuration as the two first locking members 211A, and the structure of the second linkage assembly and its connection to the two second locking members will not be described here.

[0331] 74, 75, 77, and 78, in this embodiment, the first locking member 211A of the first locking mechanism 21A and the second locking member 211B of the second locking mechanism 21B are connected by corresponding linkage members 27, allowing each locking member 211 to be switched between the locked position and the unlocked position in a synchronized manner. In this manner, an unlocking operation can be performed on any of the first locking members 211A or any of the second locking members 211B, i.e., the corresponding second locking member 211B or first locking member 211A can be synchronously released. Of course, when any of the first locking member 211A or second locking member 211B moves to the locked position, the corresponding second locking member 211B or first locking member 211A also moves to the locked position in a synchronized manner.

[0332] 74 and 77, in an embodiment, the linkage member 27 may be a tow rope. The first locking member 211A and the second locking member 211B arranged along a diagonal line are connected by the same linkage member 27, so that the first locking member 211A and the second locking member 211B connected to the same linkage member 27 move in opposite directions when unlocked and locked. More specifically, the left first locking member 211A and the right second locking member 211B are connected by a single linkage member 27, and the right first locking member 211A and the left second locking member 211B are connected by a single linkage member 27. In an embodiment, the tow rope may include a wire rope or may be wrapped in a wire rope sheath. Referring to FIG. 75, in an embodiment, the linkage member 27 connected to the first locking member 211A passes through the hole 15112 in the first tube 1511, enters the first tube 1511, enters the hollow pivot shaft 150, then enters the second tube 1521, and finally enters the second seat plate assembly 2B to connect with the corresponding second locking member 211B.

[0333] Furthermore, each linkage assembly (first linkage assembly 25A and second linkage assembly) and linkage member 27 may be collectively referred to as a linkage device, and the linkage device is connected between the locking members 211 so that these locking members 211 can move together to the unlocked position or the locked position, and the carrier 300 with multiple locking members 211 is unlocked or locked synchronously.

[0334] 74 and 77, in this embodiment, the two first locking members 211A are connected by a first linkage assembly 25A, and each first locking member 211A is connected to a corresponding second locking member 211B via a linkage member 27. In this way, even if a second linkage member is not provided between the two second locking members 211B, when either the first locking member 211A or either the second locking member 211B moves to the unlocked position or the locked position, the action of the first linkage assembly 25A and the linkage member 27 can achieve the effect of each locking member 211 (the first locking member 211A and the second locking member 211B) being unlocked or locked in synchronization. Of course, in an alternative embodiment, two second locking members 211B may be connected by a second linkage member, and each first locking member 211A may be connected to a corresponding second locking member 211B via a linkage member 27, and in this way, even if a first linkage assembly 25A is not provided between the two first locking members 211A, the effect of each locking member 211 being unlocked or locked synchronously can be similarly achieved.

[0335] This embodiment shows an exemplary embodiment for unlocking each locking member 211. Referring to Figures 67 and 68, an unlocking operation unit 212 is attached to each of the two wheel mounting portions on the left and right sides of the frame 100 (more specifically, the front wheel mounting portion 193), and the two unlocking operation units 212 are operably connected to the two first locking members 211A. By pressing either of the unlocking operation units 212, it is possible to drive each locking member 211 to move to the unlocked position. The support assembly according to this embodiment of the present invention further includes an unlocking operation unit 212.

[0336] 79 and 80, more specifically, each unlocking operation portion 212 slidably cooperates with a slide passage 1930 of the front wheel mounting portion 193. Referring to FIGS. 75 and 79, each unlocking operation portion 212 is connected to a corresponding first locking member 211A of the first seat plate assembly 2A via a respective towing rope 214. An end 2141 (see FIG. 79) of each towing rope 214 is connected to the corresponding unlocking operation portion 212, and the other end 2142 (see FIG. 75) passes from the front wheel mounting portion 193 into the bar 111 of the front support rod 11 and into the first tube 1511, then passes through the hole 15111 of the first tube 1511 into the first seat plate assembly 2A and is connected to the corresponding first locking member 211A. To simplify the layout of the towing rope 214, the unlocking operation unit 212 of the front wheel mounting portion 193 on the left side of the frame and the first locking member 211A on the right side of the frame are connected by the same towing rope 214, and the unlocking operation unit 212 of the front wheel mounting portion 193 on the right side of the frame and the first locking member 211A on the left side of the frame are also connected by the same towing rope 214. In this way, when any of the unlocking operation units 212 is pressed, the towing rope 214 directly pulls the corresponding first locking member 211A to move it to the unlocked position, and due to the action of the first linkage assembly 25A and the linkage member 27, each of the other locking members 211 also moves to the unlocked position.

[0337] In the embodiment, a reset member 195 (see FIG. 79 ) for resetting the unlocking operation unit 212 may be further attached to the front wheel mounting portion 193. The reset member 195 may be, for example, a spring. The reset member 195 is not essential. When each locking member 211 is reset to the locked position, the first locking member 211A can pull and reset the unlocking operation unit 212 via the towing rope 214. Also, in the embodiment, the frame 100 may be provided with only one unlocking operation unit 212, and similarly, each locking member 211 may be locked simultaneously. Of course, in the embodiment, the frame 100 may further be provided with a plurality of unlocking operation units 212, and the plurality of unlocking operation units 212 may be, for example, directly connected to the plurality of locking members 211 in a one-to-one correspondence. In the embodiment, each unlocking operation unit 212 may be provided at another position on the frame 100, for example, and is not limited to the front wheel mounting portion 193.

[0338] 79 and 80 , each unlock operation unit 212 may have an unlock identification area 2121 that allows a user to determine whether the locking member 211 is in the unlocked position. The unlock identification area 2121 is, for example, a patch (e.g., green) located on the unlock operation unit 212. More specifically, when the unlock operation unit 212 is not pressed, the locking member 211 is in the locked position, and the unlock identification area 2121 is located outside the front wheel mounting portion 193 and is visible. When the unlock operation unit 212 is pressed, the locking member 211 is in the unlocked position, and the unlock identification area 2121 slides inside the front wheel mounting portion 193 and is not visible. By looking at the unlock identification area 2121, the user can easily determine whether the locking member 211 is in the locked position or the unlocked position.

[0339] 75, each towing rope 214 may be, for example, a wire rope, and at least a portion of the wire rope may be wrapped in a sheath 2140. Also referring to FIG. 79, at least one guide mechanism 16 for guiding the towing ropes 214 may be provided inside the frame 100. The guide mechanism 16 may include a plurality of guide brackets provided at corners inside the tubular body of the frame 100, and these guide brackets guide each towing rope 214 to support the sheath 2140. FIGS. 79 and 80 show a guide bracket 164 between the bar 111 and the first tube 1511.

[0340] 79 and 80 , in this embodiment, the unlocking operation unit 212 has a first inclined drive surface 2123 that is inclined with respect to the sliding direction F3 of the unlocking operation unit 212. The end 2141 of the towing rope 214 abuts against the first inclined drive surface 2123 and is slidable along the first inclined drive surface 2123, pulling and moving the first locking member 211A. Specifically, when the unlocking operation unit 212 is subjected to a pressing force, that is, when it moves downward from the state shown in FIG. 79 to the state shown in FIG. 80 , the end 2141 of the towing rope 214 moves along the first inclined drive surface 2123 and the center of the front wheel mounting portion 193, and the towing rope 214 pulls the corresponding first locking member 211A and moves to the unlocked position. In this embodiment, the unlocking operation portion 212 is provided with a notch 2120, and the front wheel mounting portion 193 is provided with a hole 1933, which communicates with the internal space of the bar 111. The towing rope 214 passes through the notch 2120 and the hole 1933 and enters the bar 111.

[0341] 79 and 80 , in this embodiment, the unlocking operation portion 212 includes, for example, a first position limiting wall 2125, which extends downward relative to, for example, the first drive inclined surface 2123. A first engagement structure 2126 is formed between the first position limiting wall 2125 and the first drive inclined surface 2123. A second position limiting wall 1931 is provided within the front wheel mounting portion 193, and a second engagement structure 1932 is formed in the second position limiting wall 1931. The second engagement structure 1932 is, for example, a recessed structure. When the unlocking operation portion 212 is not pressed, the end 2141 of the towing rope 214 abuts the first engagement structure 2126 (see FIG. 79 ). When the unlocking operation 212 is pressed into place, the end 2141 of the towing rope 214 engages with the second engagement structure 1932 (see FIG. 80).

[0342] 79 and 80 , in some embodiments, a first inclined guide surface 1934 may be further provided in the front wheel mounting portion 193. The first inclined guide surface 1934 is inclined with respect to the sliding direction F3 of the unlocking operation portion 212, and forms an angle β between the first inclined guide surface 1934 and the first inclined drive surface 2123, where the angle β is, for example, an acute angle. The end 2141 of the towing rope 214 abuts both the first inclined drive surface 2123 and the first inclined guide surface 1934 within the range of the angle β. That is, when the end 2141 of the towing rope 214 moves along the first inclined drive surface 2123 between the first engagement structure 2126 and the second engagement structure 1932, the end 2141 of the towing rope 214 also moves along the first inclined guide surface 1934.

[0343] 74 and 77, the engaging base assembly 200 may further include an elastic device 24 that resets and drives each locking member 211 to the locked position. Referring to FIG. 74, in an embodiment, the elastic device 24 may include a spring 2401 provided between any one of the first locking members 211A and the housing of the first seat plate assembly 2A. For example, a spring 2401 is provided between each first locking member 211A and the upper housing 201 (or the lower housing 202). Of course, in an embodiment, the elastic device 24 may include a spring provided between two first locking members 211A. When the first locking member 211A moves to the unlocked position, the spring 2401 is compressed. 77, in an embodiment, the elastic device 24 may include a spring 2402 provided between any of the second locking members 211B and the housing of the second seat plate assembly 2B. For example, a spring 2402 is provided between each second locking member 211B and the upper housing 203 (or the lower housing 204). Of course, in an embodiment, the elastic device 24 may include a spring provided between two second locking members 211B. When the second locking member 211B moves to the unlocked position, the spring 2402 is compressed.

[0344] 78 and 81, in an embodiment, the engaging portion 2111 of each locking member 211 (first locking member 211A and second locking member 211B) may have an inclined surface 2112 that allows each engaging member 311 to enter each engaging passage 22 (first engaging passage 22A and second engaging passage 22B) without pressing the unlocking operation portion 212.

[0345] 81 to 86, in an embodiment, the frame 100 may further include at least one retention mechanism 23, and when each locking member 211 is driven to the unlocked position, the retention mechanism 23 can directly or indirectly lock each locking member 211 in the unlocked position. The support assembly includes this retention mechanism 23. In this embodiment, two retention mechanisms 23 are arranged in one-to-one correspondence with the two locking members 211 (more specifically, first locking members 211A). When each first locking member 211A moves to the unlocked position, each retention mechanism 23 directly locks the corresponding first locking member 211A in the unlocked position, and the second locking member 211B corresponding to each first locking member 211A is indirectly locked in the unlocked position. Therefore, the user does not need to continue the unlocking operation on the unlocking operation unit 212 (i.e., by pressing the unlocking operation unit 212), and each locking member 211 is held in the unlocked position, so that the user can easily remove the carrier 300 from the frame 100 by simply lifting the carrier 300.

[0346] As can be seen from the above, after any of the unlocking operation units 212 drives the corresponding first locking member 211A to the unlocked position, all of the locking members 211 (the first locking member 211A and the second locking member 211B) move to the unlocked position through the action of the linkage assembly 25 and the linkage member 27. Similarly, through the action of the linkage assembly 25 and the linkage member 27, as long as one of the locking members 211 (either the first locking member 211A or the second locking member 211B) is locked in the unlocked position by the retention mechanism 23, all of the locking members 211 are locked in the unlocked position. In an alternative embodiment, one retention mechanism 23 may be arranged on only one of the locking members 211 (either the first locking member 211A or the second locking member 211B), and no retention mechanism 23 may be arranged on the other locking members 211. Of course, in an alternative embodiment, each of the locking members 211 may be arranged with a retention mechanism 23.

[0347] 81 to 87, there is shown an embodiment of the retention mechanism 23. The retention mechanism 23 includes, for example, a movable member 231 and a reset device 236 (see FIG. 87).

[0348] The movable member 231 is attached to a slide passage 220 that communicates with a corresponding engagement passage 22 (more specifically, the first engagement passage 22A), and the slide passage 220 is located below the first engagement passage 22A. The movable member 231 has an abutting end 2311 that extends into the first engagement passage 22A and an engaging end 2312 that is spaced apart from the abutting end 2311. The abutting end 2311 abuts against the engagement member 311, and the engagement member 311 located in the first engagement passage 22A presses the abutting end 2311 from the first engagement passage 22A into the slide passage 220. In an embodiment, the engaging end 2312 may be provided with a first buckle portion 2301, which is, for example, an engagement groove.

[0349] 75 and 86, in this embodiment, the first locking member 211A is provided with a resilient arm 213, which extends in the left-right direction to the vicinity of the abutting end 2311 of the movable member 231. The resilient arm 213 may be provided with a second buckle portion 232, which includes, for example, a wedge-shaped step formed on the resilient arm 213. In this embodiment, the resilient arm 213 may be integrally formed with the corresponding first locking member 211A. In an alternative embodiment, the resilient arm 213 may be attached to the corresponding first locking member 211A.

[0350] 87 and 88, the reset device 236 may include a first reset member 233, a pull wire 234, and a sliding member 235. The first reset member 233 and the sliding member 235 are attached to, for example, the hollow bar 111 of the front support rod 11. One end of the pull wire 234 is connected to the sliding member 235, and the other end enters the first coupling member 1511 via the guide bracket 164, then passes through a hole 15112 (see FIG. 75) and protrudes into the first seat plate assembly 2A to be connected to the movable member 231. The first reset member 233 abuts against the sliding member 235 and drives it to reset, and the pull wire 234 drives and moves the movable member 231, causing the abutting end 2311 of the movable member 231 to protrude into the corresponding engagement passage 22 (first engagement passage 22A). In an embodiment, the first reset member 233 may be, for example, a spring, and may be sandwiched between the guide bracket 164 and the sliding member 235 .

[0351] 83 and 84 , in the embodiment, the movable member 231 has a connection portion 2313 located outside the slide passage 220, the pulling wire 234 is supported by a guide bracket 165 located outside the slide passage 220, and the end portion 2341 of the pulling wire 234 is connected to the connection portion 2313. The movement direction F4 of the pulling wire 234 located between the guide bracket 165 and the connection portion 2313 is parallel to the slide passage 220, thereby allowing the movable member 231 to be pulled and moved into the corresponding first engagement passage 22A.

[0352] Next, the operation of the holding mechanism 23 will be described with reference to FIGS.

[0353] Referring to Figure 81, when the carrier 300 is not attached to the engagement base assembly 200, the abutment end 2311 of the movable member 231 protrudes into the corresponding first engagement passage 22A, the first buckle portion 2301 and the second buckle portion 232 provided on the engagement end 2312 are separated from each other, and the first buckle portion 2301 is positioned above the second buckle portion 232.

[0354] 82 to 84, when the carrier 300 is attached to the engagement base assembly 200, each engagement member 311 is locked in the corresponding engagement passage 22 by each lock member 211. The movable member 231 is pushed by the engagement member 311 to move downward along the slide passage 220, moving the first buckle portion 2301 onto the movement path of the second buckle portion 232 (i.e., the engagement end 2312 moves onto the movement path of the first lock member 211A). The movement of the movable member 231 moves the end 2341 of the pulling wire 234 downward in conjunction with the movement of the movable member 231, and as shown in FIG. 88, the pulling wire 234 simultaneously drives the sliding member 235 to move downward along the bar 111 against the tensile force of the first reset member 233, and the first reset member 233 is compressed.

[0355] 80 and 85, when it is necessary to remove the carrier 300 from the engagement base assembly 200, one of the unlocking operation units 212 is pressed, and the unlocking operation unit 212 drives the corresponding first locking member 211A to move to the unlocked position, and as can be seen from the above, the other locking members 211 also move to the unlocked position. As the first locking member 211A moves, the second buckle unit 232 abuts against the engaging end 2312 of the movable member 231, and the elastic arm 213 elastically deforms, causing the first locking member 211A to continue moving. After the first locking member 211A moves to the unlocked position, the second buckle portion 232 faces the first buckle portion 2301, and at this time, the elastic arm 213 elastically rebounds, causing the second buckle portion 232 to engage with the first buckle portion 2301 (i.e., the engaging end 2312 and the first locking member 211A engage with each other), thereby locking the first locking member 211A and the other locking members 211 directly or indirectly to the unlocked position by the holding mechanism 23. Thereafter, even if the unlocking operation portion 212 is released, the elastic device 24 cannot drive the locking members 211 to the unlocked position due to the engagement between the second buckle portion 232 and the first buckle portion 2301. Therefore, the user can easily remove the carrier 300 from the frame 100 by simply lifting the carrier 300 upward without continuing to press the unlocking operation portion 212.

[0356] After the carrier 300 is removed from the engagement base assembly 200, the engagement member 311 moves away from the engagement passage 22 and no longer abuts against the abutting end 2311 of the movable member 231, and the sliding member 235, which is the compressed first reset member 233, resets as shown in FIG. 87. When the sliding member 235 resets, it moves upward along the bar 111, and the pulling wire 234 drives the movable member 231 to reset, causing the abutting end 2311 of the movable member 231 to move upward and protrude again into the engagement passage 22. Referring to FIG. 86, the engagement end 2312 of the movable member 231 moves the first buckle portion 2301 out of the movement path of the second buckle portion 232 and no longer prevents the corresponding first locking member 211A from moving to the locked position, and each locking member 211 is reset to the locked position by the elastic device 24.

[0357] Of course, in alternative embodiments, the holding mechanism 23 may have multiple embodiments and is not limited to the above examples. For example, in an alternative embodiment, the first buckle portion 2301 may be a wedge-shaped step provided on the engaging end 2312 of the movable member 231, and the second buckle portion 232 may be an engagement groove provided on the elastic arm 213. In an alternative embodiment, the movable member 231 of the holding mechanism 23 is attached to, for example, the second seat plate assembly 2B, and the movable member 231 is pressed against the engagement member 311 protruding into the second engagement passage 2B, and the second buckle portion 232 is connected to the second locking member 211B according to the elastic arm provided thereon. Referring to FIG. 76 , in an embodiment, the reset device 236 of the holding mechanism 23 may further include a reset member 237 that abuts against the movable member 231 and moves the abutting end 2311 of the movable member 231 upward and protrudes into the engagement passage 22.

[0358] 87 and 88 , in this embodiment, the sliding member 235 has an engagement indication region 2351, and the bar 111 is provided with an observation hole 110 through which the engagement indication region 2351 can be observed. The engagement indication region 2351 includes, for example, a patch (e.g., green) located on the sliding member 235. As described above, when the movable member 231 is pressed by the engagement member 311, the sliding member 235 is pulled by the pull wire 234 and moves downward, and at this time, the green patch of the engagement indication region 2351 moves to the observation hole 110 and is visible. This allows the user to determine that the movable member 231 has been pressed by the engagement member 311 of the carrier, and further, that the carrier 300 has been locked by the engagement base assembly 200. When the movable member 231 is not pressed by the engagement member 311, the green patch of the engagement indication area 2351 resets above the observation hole 110 and becomes invisible, and at this time, the carrier 300 may already be placed on the engagement base assembly 200 but is not locked by the engagement base assembly 200. The user can adjust the relative positions of the carrier 300 and the engagement base assembly 200 by viewing the display of the engagement indication area 2351 so that the carrier 300 is securely locked to the engagement base assembly 200.

[0359] Fifth Example

[0360] FIG. 89 shows a perspective view of a wheeled transportation device 1000 according to a fifth embodiment of the present invention. The wheeled transportation device 1000 may include a frame 100, an engagement table assembly 200, and a carrier 300. The wheeled transportation device 1000 of this embodiment is a modified version of the wheeled transportation device 1000 of the fourth embodiment. Unless inconsistent, the structure of the components and the connection relationships between the components in this embodiment may refer to the description of the fourth embodiment. The following description will mainly focus on the differences between this embodiment and the fourth embodiment. It can be understood that the wheeled transportation device 1000 according to this embodiment accordingly further includes a support assembly according to an embodiment of the present invention. The support assembly includes at least the engagement table assembly 200 and may further include a first coupling member 151 and an auxiliary support member 152.

[0361] 90 to 92, modifications have been made to the holding mechanism 23 in this embodiment of the present invention. The holding mechanism 23 includes a movable member 231 and a reset device 236. The reset device 236 includes a reset member 237, but the first reset member 233, the pulling wire 234, and the sliding member 235 in the fourth embodiment are omitted. Accordingly, the bar 111 does not need to be provided with the observation hole 110 in the fourth embodiment, and the movable member 231 can accordingly omit the connection portion 2313 for connecting with the pulling wire 234 in the fourth embodiment. In addition, the pulling rope 214 and the linkage member 27 can enter the inside of the first seat plate assembly 2A through the hole 15111 in the first tube 15111, and thus the hole 15112 in the fourth embodiment can be omitted.

[0362] 91 to 94 , in an embodiment, the reset member 237 may be, for example, a spring, one end of which abuts against the movable member 231 and the other end of which abuts against, for example, the lower housing 202 of the first seat plate assembly 2A. When the engagement member 311 of the carrier 300 protrudes into the engagement passage 22 and abuts against the abutting end 2311 of the movable member 231, the movable member 231 moves downward and compresses the reset member 237. When the engagement member 311 leaves the engagement passage 22 and no longer presses against the abutting end 2311 of the movable member 231, the reset member 237 elastically resets, driving the movable member 231 to move upward, so that the abutting end 2311 of the movable member 231 protrudes into the engagement passage 22 again. In an embodiment, the movable member 231 may include, for example, a chamber 2310 that houses the reset member 237.

[0363] 91 to 93, in an embodiment, the movable member 231 further includes a position limiting portion 2314 located outside the slide passage 220, and the position limiting portion 2314 protrudes, for example, toward the corresponding locking member 211. The locking member 211 is provided with an alignment portion 2113 that abuts against the position limiting portion 2314. In the embodiment, the locking member 211 has a recess 210, and the alignment portion 2113 is formed on a wall of the recess 210. More specifically, when the reset member 237 drives the movable member 231 to move up and down, the position limiting portion 2314 moves up and down accordingly, and can move onto the movement path of the locking member 211 or retract from the movement path of the locking member 211. 92, when the locking member 211 is in the unlocked position and the engaging member 311 moves out of the engagement passage 22, the resetting member 237 drives the movable member 231 to move upward, causing the abutting end 2311 of the movable member 231 to protrude into the engagement passage 22, and at the same time, the position limiting portion 2314 moves into the movement path of the locking member 211. Referring to FIG. 93, when the abutting end 2311 is positioned in the engagement passage 22, the position limiting portion 2314 abuts against the alignment portion 2113. The abutment between the position limiting portion 2314 and the alignment portion 2113 can prevent the locking member 211 from being reset to its locked position. In this way, when the carrier 300 needs to be reinstalled, the engaging member 311 of the carrier 300 can enter the engagement passage 22 without being obstructed by the locking member 211.

[0364] Next, the operation process of the holding mechanism 23 will be described with reference to Figures 94 to 98.

[0365] 94, when the carrier 300 is attached to the engagement base assembly 200, each engagement member 311 is locked in the corresponding engagement passage 22 by each lock member 211. Referring to FIG. 95, the abutment end 2311 of the movable member 231 is pushed by the engagement member 311 and moves downward along the slide passage 220 to retract from the engagement passage 22, moving the first buckle portion 2301 onto the movement path of the second buckle portion 232 (i.e., the engagement end 2312 moves onto the movement path of the first lock member 211A), and at the same time, the position limiting portion 2314 is released from the movement path of the lock member 211, and the reset member 237 is compressed.

[0366] 96, in accordance with the description of the fourth embodiment above, when it is necessary to remove the carrier 300 from the engagement base assembly 200, one of the unlocking operation units 212 is pressed, and the unlocking operation unit 212 drives the corresponding first locking member 211A to move to the unlocked position in the direction Y1, and the other locking members 211 also move to the unlocked position together. When the second buckle unit 232 abuts against the engaging end 2312 of the movable member 231 as the first locking member 211A moves, the elastic arm 213 elastically deforms, allowing the first locking member 211A to continue moving. After the first locking member 211A moves to the unlocked position, the second buckle portion 232 faces the first buckle portion 2301, and at this time, the elastic arm 213 elastically rebounds, causing the second buckle portion 232 to engage with the first buckle portion 2301 (i.e., the engaging end 2312 and the first locking member 211A engage with each other), thereby locking the first locking member 211A and the other locking members 211 directly or indirectly to the unlocked position by the holding mechanism 23. Thereafter, even if the unlocking operation portion 212 is released, the elastic device 24 cannot drive the locking members 211 to the unlocked position due to the engagement between the second buckle portion 232 and the first buckle portion 2301. Therefore, the user can easily remove the carrier 300 from the frame 100 by simply lifting the carrier 300 upward without continuing to press the unlocking operation portion 212. 96, when each locking member 211 is locked in the unlocked position, the recess 210 is located above the position limiting portion 2314, and there is space for the position limiting portion 2314 to move upward. In this embodiment, when the second buckle portion 232 is engaged with the first buckle portion 2301, the alignment portion 2113 and the position limiting portion 2314 have a small gap D in the movement direction of the corresponding locking member 211, and the alignment portion 2113 is in a position for moving upward without interfering with the position limiting portion 2314.

[0367] 97 and 98, after the carrier 300 is removed from the engagement base assembly 200, the engagement member 311 moves away from the engagement passage 22 and no longer abuts against the abutting end 2311 of the movable member 231. The compressed reset member 237 resets and directly moves the abutting end 2311 of the movable member 231 upward to protrude into the engagement passage 22 (first engagement passage 22A) again. During the upward movement of the movable member 231, at the moment when the second buckle portion 232 is disengaged from the first buckle portion 2301, the movable member 231 continues to move upward, and the position limiting portion 2314 moves into the movement path of the first locking member 211A. At the same time, the locking member 211 is pushed by the elastic device 24 and moves by the distance D (see FIG. 96) in the direction Y2 to the locked position until the alignment portion 2113 abuts against the position limiting portion 2314. At this time, if the position limiting portion 2314 is obstructed, the locking members 211 cannot continue moving to the locked position. If the gap D is small and the engaging members 311 of the carrier 300 are disengaged from the engaging passages 22, each locking member 211 is still held in the unlocked position.

[0368] 98, after the abutment end 2311 of the movable member 231 enters the engagement passage 22, the first buckle portion 2301 of the movable member 231 moves upward and out of the movement path of the second buckle portion 232, and no longer blocks the movement of the corresponding first locking member 211A to the locked position. However, due to the action of the abutting position limiting portion 2314 and the alignment portion 2113, each locking member 211A is still held in the unlocked position. In this way, when it is necessary to reinstall the carrier 300, the engagement member 311 of the carrier 300 can enter the engagement passage 22 without being obstructed by the locking member 211. Furthermore, because the locking member 211 moved by the distance D along the direction Y2 to the locked position before the alignment portion 2113 abutted against the position limiting portion 2314, the first buckle portion 2301 and the second buckle portion 232 do not face each other in the movement direction of the movable member 231. When one of the first buckle portion 2301 and the second buckle portion 232 is an engagement groove and the other is a wedge-shaped step, the groove wall 23011 of the engagement groove corresponds to the side surface 2321 of the wedge-shaped step. In an embodiment, at least one of the groove wall 23011 and the side surface 2321 includes an inclined surface (in this embodiment, the side surface 2321 includes an inclined surface 23211, for example).

[0369] When it is necessary to attach the carrier 300 to the engaging table assembly 200 again, the engaging member 311 is placed in the engaging passage 22, and the engaging end 2312 of the movable member 231 is pressed to retract from the engaging passage 22. In the process of the engaging end 2312 retracting from the engaging passage 22, the reset member 237 is compressed, and the position limiting portion 2314 moves downward and out of the movement path of the first locking member 211A. The position limiting portion 2314 no longer abuts against the matching portion 2113 and no longer obstructs the movement of the corresponding first locking member 211A to the locked position. As the position limiting portion 2314 moves downward, the groove wall 23011 and the side surface 2321 come into contact with each other via the inclined surface 23211, which causes the elastic arm 213 to move the second buckle portion 232 away from the first buckle portion 2301, thereby preventing the second buckle portion 232 from engaging with the first buckle portion 2301 and not affecting the elastic device 24's ability to drive each locking member 211 to move to the locked position. When the engaging member 311 is positioned in place, each locking member 211 is driven by the elastic device 24 to the locked position.

[0370] This embodiment is similar to the locking method of the locking members 211 in the fourth embodiment. An unlocking operation unit 212 is attached to each of two wheel mounting portions (more specifically, the front wheel mounting portion 193) on the left and right sides of the frame 100, and the two unlocking operation units 212 are operably connected to the two first locking members 211A. By pressing either of the unlocking operation units 212, the locking members 211 can be driven to move to the unlocked position. Each unlocking operation unit 212 may also have an unlocking identification area 2121 that allows the user to determine whether the locking member 211 is in the unlocked position. The unlocking identification area 2121 is, for example, a patch (e.g., green) located on the unlocking operation unit 212. When the unlocking operation unit 212 is not pressed, the locking member 211 is in the locked position, and the unlocking identification area 2121 appears to be located outside the front wheel mounting portion 193. When the unlock operation portion 212 is pressed, the lock member 211 is in the unlock position, and the unlock identification area 2121 slides inside the front wheel mounting portion 193 and is not visible.

[0371] Referring to Figures 99 to 102, the unlock identification area 2121 of the unlock operation unit 212 that is directly pressed is invisible, but the unlock identification area 2121 of the unlock operation unit 212 that is not directly pressed is still not visible and is difficult for the user to distinguish. In this embodiment, an unlock state synchronization mechanism 196 is further provided to make the unlock identification areas 2121 of different unlock operation units 212 visible or invisible at the same time.

[0372] This embodiment illustrates an exemplary embodiment of the unlocked state synchronization mechanism 196. The unlocked state synchronization mechanism 196 includes, for example, a second reset member 1961. The second reset member 1961 abuts against the end 2141 of the towing rope 214, and the second reset member 1961 applies a force to the end 2141 of the towing rope 214 to move it toward the second engagement structure 1932 via the first engagement structure 2126. In this manner, when one unlocking operation unit 212 is directly pressed, the end 2141 of the towing rope 214 corresponding to the unlocking operation unit 212 that is not directly pressed is driven by the second reset member 1961 to move toward the second engagement structure 1932 and disengage from the first drive inclined surface 2123, allowing the unlocking operation unit 212 that is not directly pressed to slide downward by gravity. As a result, the unlock operation portion 212 that is not directly pressed and the unlock identification area 2121 of the unlock operation portion 212 that is directly pressed are not visible at the same time. The two unlock operation portions 212 are simultaneously in a state to unlock the lock member 211.

[0373] Hereinafter, the operation process of each unlocking operation unit 212 will be described in detail with reference to FIGS.

[0374] 99 and 100, in an embodiment, the second reset member 1961 may be a spring, which is provided outside the towing rope 214, with one end of the spring abutting against the end 2141 of the towing rope 214 and the other end of the spring being restricted by any suitable structure. For example, the other end of the spring may abut against the guide bracket 164. When each locking member 211 is in the locked position and none of the two unlocking operating units 212 is directly pressed, the towing ropes 214 connected to the two first locking members 211A are both in a tensioned state. The end 2141 of the two towing ropes 214 is respectively joined to the corresponding first engagement structures 2126, and each second reset member 1961 is compressed.

[0375] 101 and 102, the two unlocking operation units 212 include a left unlocking operation unit 212A or a right unlocking operation unit 212B. When a user directly presses either of the unlocking operation units 212, for example, by directly pressing the left unlocking operation unit 212A, the end 2141 of the towing rope 214 connected to the left unlocking operation unit 212A is driven by the first driving inclined surface 2123 and moves along the first driving inclined surface 2123 and the first guide inclined surface 1934 into the second engagement structure 1932. When the unlocking operation unit 212A is pressed to a predetermined position, the unlocking identification region 2121 on the unlocking operation unit 212A enters the interior of the left front wheel mounting portion 193, thereby moving the first locking member 211A operably connected to the unlocking operation unit 212A to the unlocked position.

[0376] As is clear from the description of the fourth embodiment, when the first locking member 211A operably connected to the unlocking operation unit 212A moves to the unlocked position due to the action of the first linkage assembly 25A, the first locking member 211A operably connected to the right unlocking operation unit 212B is synchronously switched from the locked position to the unlocked position. During this process, the towing rope 214 connected to the unlocking operation unit 212B (hereinafter simply referred to as the right towing rope 214) tends to slacken. At this time, the second reset member 1961 corresponding to the right towing rope 214 drives the end 2141 of the right towing rope 214 to move from the first engagement structure 2126 to the second engagement structure 1932. The end 2141 of the right tow rope 214 is separated from the first drive inclined surface 2123 of the unlocking operation part 212B, so that the unlocking operation part 212B automatically slides down the slide path 1930 due to the action of gravity, and the release lock recognition area 2121 on the unlocking operation part 212B enters the inside of the right front wheel mounting part 193 and is not visible. In this case, the unlocking identification areas 2121 of the two unlocking operation parts 212 are not visible at the same time, and the user can determine that the locking member 211 is in the locked position or the unlocked position simply by directly observing one of the unlocking identification areas 2121, making it less likely to make an erroneous determination.

[0377] When each locking member 211 moves from one locked position to another, each first locking member 211A synchronously moves the corresponding towing rope 214, and the end 2141 of each towing rope 214 simultaneously drives the first drive inclined surfaces 2123 of the corresponding unlocking operation units 212A and 212B, causing the unlocking operation units 212A and 212B to move upward simultaneously. The unlock identification areas 2121 of the unlocking operation units 212A and 212B are simultaneously exposed and visible to the outside of the front wheel mounting portion 193. The two unlocking operation units 212 are simultaneously in an unlocked state for the locking members 211.

[0378] Sixth Example

[0379] 103 shows a perspective view of a wheeled transportation device 1000 according to a sixth embodiment of the present invention, which is similar to the fourth embodiment and includes a frame 100, an engagement table assembly 200, and a carrier 300. The wheeled transportation device 1000 includes a support assembly according to another embodiment of the present invention, and the wheeled transportation device 1000 will be described below together with the support assembly.

[0380] The configuration of frame 100 is generally symmetrical. Frame 100 may include a front support rod 11, a rear support rod 12, an upper support rod 13, and a handlebar 14. Frame 100 can be folded into an unfolded state (see FIG. 104) and a folded state (see FIG. 105).

[0381] 104, the front support rod 11 has, for example, a U-shaped structure and includes two bars 111 located on both the left and right sides and a first cross bar 101 connected between the two bars 111, the first cross bar 101 extending in the left-right direction (first direction F1). Two front wheel mounting portions 193 are attached to both the left and right ends of the first cross bar 101, and each front wheel mounting portion 193 is used to mount a front wheel 191, which may be a swivel wheel or a non-swivel wheel.

[0382] The rear support rod 12 has, for example, a U-shaped structure and includes two bars 121 located on both the left and right sides and a rear cross bar 122 connected between the two bars 121, with the rear cross bar 122 extending in the left-right direction (first direction F1). The upper end of each bar 121 is pivotally connected to the upper end of each bar 111 of the front support rod 11 on the same side, for example, by a pivot portion 118. Two rear wheel mounting portions 193 are attached to the rear support rod 12 with a gap between them in the left-right direction. Each rear wheel mounting portion 193 is used to mount a respective rear wheel 192, which may be a swivel wheel or a non-swivel wheel.

[0383] The upper support rod 13 includes two bars 131 located on both the left and right sides, with the lower ends of each bar 131 pivotally connected to the pivot portions 118 on the same side, and the upper ends of each bar 131 connected to the handlebar 14. In an embodiment, the handlebar 14 has, for example, a U-shaped structure and includes two bars 141 located on both the left and right sides, and the two bars 141 of the handlebar 14 are connected to the two bars 131 via, for example, a telescopic structure, allowing the height of the handlebar 14 to be changed.

[0384] In this embodiment, the pivot portion 118 includes a locking mechanism (not shown) that locks the relative positions of the front support rod 11, the rear support rod 12, and the upper support rod 13, and the locking mechanism holds the frame 100 in the unfolded state. When the locking mechanism is unlocked, the frame 100 is allowed to change to the folded state.

[0385] 106 to 108 , in this embodiment, the support assembly includes a first connecting member 151, an auxiliary support member 152, and an engagement table assembly 200. Unlike the above-described fourth embodiment, the first connecting member 151 and the auxiliary support member 152 can be detachably connected to the frame 100, rather than between the front support rod 11 and the rear support rod 12 of the frame 100. The first seat plate assembly 2A of the engagement table assembly 200 is attached to the first connecting member 151, and the second seat plate assembly 2B is attached to the auxiliary support member 152, and the engagement table assembly 200 supports and locks the carrier 300. In the wheeled transportation device 1000 according to this embodiment, the entire support assembly can be removed from the frame 100, and the frame 100 can be detachably connected to the engagement table assembly 200, and the engagement table assembly 200 can be detachably connected to the carrier 300.

[0386] 104, 106, and 107, in an embodiment, the first seat plate assembly 2A is connected to the first pivot base 81 via a first coupling member 151, and the second seat plate assembly 2B is connected to the second pivot base 82 via an auxiliary support member 152, with the first pivot base 81 and the second pivot base 82 pivotally connected to each other and having a rotation axis XX. In an embodiment, the first pivot base 81 is close to the vertical center plane of the frame 100 (called the left-right symmetry plane of the frame 100), and the second pivot base 82 is away from the vertical center plane of the frame 100. The second pivot base 82 is pivotally connected to a mounting base part 83, which is attached to a pivot part 118 of the frame 100 and may be detachably connected to a locking hole (not shown) in the pivot part 118 via a locking member 831.

[0387] 104 and 107, when the frame 100 is in the unfolded state, the first connecting member 151 and the auxiliary support member 152 are unfolded and disposed substantially horizontally, and the angle α between them is approximately 180 degrees. Of course, in an embodiment, when the frame 100 is in the unfolded state, the angle α formed between the first connecting member 151 and the auxiliary support member 152 may be an obtuse angle greater than 90 degrees. In an embodiment, a locking mechanism may be provided between the first pivot base 81 and the second pivot base 82 to lock the relative positions of the first pivot base 81 and the second pivot base 82 and maintain the first connecting member 151 and the auxiliary support member 152 in the unfolded state.

[0388] When the frame 100 needs to be folded, the first connecting member 151 and the auxiliary support member 152 rotate relative to each other and are folded, and the angle α between the first connecting member 151 and the auxiliary support member 152 after folding is an acute angle less than 90 degrees (see Figure 105).

[0389] 107 and 108, in an embodiment, the first coupling member 151 may include two first tubes 1511 arranged in parallel and an intermediate tube 1512 connected between the two first tubes 1511. The auxiliary support member 152 may include two second tubes 1521 arranged in parallel and an intermediate tube 1522 connected between the two second tubes 1521. An end of each first tube 1511 is connected to a corresponding first pivot base 81, and an end of each second tube 1521 is connected to a corresponding second pivot base 82. The first pivot base 81 and the second pivot base 82 on the same side are pivotally connected.

[0390] 107 , in an embodiment, an unlocking portion 84 is attached to the first pivot base 81 via a pivot shaft 841, and the pivot shaft 841 is parallel to the second direction F2. The unlocking portion 84 is rotatable around the pivot shaft 841 and can unlock the positions of the first pivot base 81 and the second pivot base 82, allowing the first pivot base 81 and the second pivot base 82 to rotate relative to each other. In an embodiment, a hole 840 may be provided in the unlocking portion 84, and a tension member 842 may be attached to the hole 840. The tension member 842 may be, for example, a webbing. When the first connecting member 151 and the auxiliary support member 152 need to be folded, the tension member 842 drives the unlocking portion 84 to pivot around the pivot shaft 841. After the lock release portion 84 rotates to a predetermined position, the position lock between the first pivot base 81 and the second pivot base 82 is released, and the user can manually drive the first connecting member 151 and the auxiliary support member 152 to fold. In this embodiment, when the first pivot base 81 and the second pivot base 82 rotate relative to each other, the drive member 85 in the mounting base portion 83 can be driven to move, and the movement of the drive member 85 unlocks the lock mechanism in the first pivot portion 118 (see FIG. 105), thereby releasing the position lock of the front support rod 11, the rear support rod 12, and the upper support rod 13, and the front support rod 11, the rear support rod 12, and the upper support rod 13 can be folded.

[0391] 107 and 108, in an embodiment, the engagement base assembly 200 may include a first sheet plate assembly 2A and a second sheet plate assembly 2B. The first sheet plate assembly 2A is attached to the first connecting member 151, and the second sheet plate assembly 2B is attached to the auxiliary support member 152. As can be seen from the above, the first sheet plate assembly 2A and the second sheet plate assembly 2B are relatively rotatable about the rotation axis XX, and the engagement base assembly 200 has an unfolded state and a folded state. With reference to FIG. 104, the unfolded state of the engagement base assembly 200 corresponds to the unfolded state of the frame 100. With reference to FIG. 105, the folded state of the engagement base assembly 200 corresponds to the folded state of the frame 100.

[0392] In an alternative embodiment, the support assembly may not have the first connecting member 151 and the auxiliary support member 152, and the first seat plate assembly 2A may be directly connected to, for example, the first pivot base 81, and the second seat plate assembly 2B may be directly connected to, for example, the second pivot base 82, which also falls within the scope of the present invention.

[0393] 104 and 107, the first seat plate assembly 2A is attached to the first connecting member 151 and includes a locking mechanism, more specifically, a first locking mechanism 21A. The second seat plate assembly 2B is attached to the auxiliary support member 152 and includes a locking mechanism, more specifically, a second locking mechanism 21B. Both the first seat plate assembly 2A and the second seat plate assembly 2B include at least one engagement passage 22 extending in the front-to-rear direction (second direction F2). Both the first locking mechanism 21A and the second locking mechanism 21B include at least one locking member 211, and each locking member 211 moves in the left-to-right direction (first direction F1) and has a locked position where it is inserted into the corresponding engagement passage 22 and an unlocked position where it is retracted from the corresponding engagement passage 22. The movement direction of each locking member 211 is parallel to the rotation axis XX. When the locking member 211 is in the locked position, the carrier 300 can be locked, and when the locking member 211 is in the unlocked position, the carrier 300 is allowed to move from the engagement platform assembly 200 .

[0394] 104, 106, and 108, the engagement passage 22 in the first seat plate assembly 2A may be referred to as the first engagement passage 22A, and the engagement passage 22 in the second seat plate assembly 2B may be referred to as the second engagement passage 22B. The locking member 211 of the first locking mechanism 21A may be referred to as the first locking member 211A, and the first locking member 211A may be located, for example, directly above the intermediate tube 1512. The locking member 211 of the second locking mechanism 21B may be referred to as the second locking member 211B, and the second locking member 211B may be located, for example, directly above the intermediate tube 1522. In this embodiment, the number of first engagement passages 22A and first locking members 211A may both be two, and the unlocking and locking directions of the two first locking members 211A may be opposite. The number of second engagement passages 22B and second locking members 211B may both be two, and the unlocking and locking directions of the two second locking members 211B may be opposite. Of course, in an alternative embodiment, the unlocking and locking directions of the two first locking members 211A may be the same, and the unlocking and locking directions of the two second locking members 211B may be the same.

[0395] 108, in an embodiment, the first seat plate assembly 2A includes, for example, an upper housing 201 and a lower housing 202, the first engagement passage 22A is formed in the upper housing 201, and the first locking member 211A is located in a storage cavity surrounded by the upper housing 201 and the lower housing 202. The second seat plate assembly 2B includes, for example, an upper housing 203 and a lower housing 204, the second engagement passage 22B is formed in the upper housing 203, and the second locking member 211B is located in a storage cavity surrounded by the upper housing 203 and the lower housing 204.

[0396] 103 shows another exemplary embodiment of a carrier 300, which is, for example, a baby carrier, and the bracket device of the baby carrier includes a ring-shaped structure located at the bottom, which is exposed at the bottom of the carrier 300, and the ring-shaped structure (which can be considered as an engagement member 311) has two bars parallel to each other and is engageable with each engagement channel 22 (first engagement channel 22A and second engagement channel 22B). When the carrier 300 is supported and locked on the engagement base assembly 200, each engagement member 311 is engaged with the corresponding first engagement channel 22A and second engagement channel 22B, and is locked by the first locking member 211A of the first locking mechanism 21A and the second locking member 211B of the second locking mechanism 21B, respectively.

[0397] 106, when each locking member 211 (first locking member 211A and second locking member 211B) is in the locked position, the engaging portion 2111 (e.g., a bolt) of each locking member 211 is inserted into the corresponding engagement passage 22 (first engagement passage 22A and second engagement passage 22B) to lock the corresponding engagement member 311, and the engagement member 311 cannot be removed from the engagement passage 22. When the two first locking members 211A move toward each other and the two second locking members 211B move toward each other and retreat from the corresponding engagement passage 22, the engagement members 311 are allowed to disengage from the corresponding engagement passage 22, and the carrier 300 can be disengaged from the engagement table assembly 200.

[0398] Referring to FIG. 108, in this embodiment, two first locking members 211A are connected by a first linkage assembly 25A. The first linkage assembly 25A controls the two first locking members 211A to move synchronously, switching the two first locking members 211A between their locked and unlocked positions synchronously. In this manner, an unlocking operation can be performed on either of the first locking members 211A, i.e., the other first locking member 211A can be unlocked simultaneously. Of course, when either of the first locking members 211A moves to the locked position, the other first locking member 211A moves to the locked position synchronously by the first linkage assembly 25A. The connection relationship between the first linkage assembly 25A and each first locking member 211A can be referenced in the fourth embodiment, and therefore will not be described here.

[0399] 108, in this embodiment, the first locking member 211A of the first locking mechanism 21A and the second locking member 211B of the second locking mechanism 21B are connected by corresponding linkage members 27 and can be switched synchronously between their respective locked and unlocked positions. In this manner, an unlocking operation can be performed on either the first locking member 211A or the second locking member 211B, i.e., the corresponding second locking member 211B or first locking member 211A can be released synchronously.

[0400] Continuing to refer to FIG. 108 , in an embodiment, the linkage member 27 may be a towing rope. The first locking member 211A and the second locking member 211B, which are arranged along a diagonal line, are connected by the same linkage member 27. This allows the first locking member 211A and the second locking member 211B, which are connected to the same linkage member 27, to move in opposite directions for unlocking and unlocking, thereby enabling the carrier 300 to be locked or unlocked synchronously. More specifically, the left first locking member 211A and the right second locking member 211B are connected by a single linkage member 27, and the right first locking member 211A and the left second locking member 211B are connected by a single linkage member 27. In an embodiment, the towing rope may include a wire rope, and at least a portion of the wire rope may be wrapped in a wire rope sheath.

[0401] 107 to 113, in an embodiment, a guide structure 801 is provided on the first pivot base 81 and / or the second pivot base 82, and each linkage member 27 has a guide section 270 that engages with the guide structure 801. When the first connecting member 151 and the auxiliary support member 152 rotate relative to each other, the guide section 270 engages with the guide structure 801, thereby preventing the towing rope of the linkage member 27 from piling up.

[0402] 109, in an embodiment, the first pivot base 81 includes a disk body 811 and a cover body 812. The disk body 811 has a sleeve 813, which is connected to the first tube 1511 of the first coupling member 151. One side of the disk body 811 faces the second pivot base 82 (see FIG. 107), and the cover body 812 is attached to the other side of the disk body 811. The disk body 811 has a groove 8110, and the pivot portion 845 of the unlocking portion 84 enters the groove 8110 and is connected to the disk body 811 via the pivot shaft 841. Referring to FIG. 106, in an embodiment, the cover body 812 and the unlocking portion 84 have shapes that are substantially complementary to each other, and the area of ​​the cover body 812 is larger than the area of ​​the unlocking portion 84. 109 and 112, the center of the disk body 811 has a pillar body 802, which has holes through which the pivot shafts of the first pivot base 81 and the second pivot base 82 pass, and the cover body 812 covers the pillar body 802.

[0403] Continuing to refer to FIG. 109 , in this embodiment, the unlocking portion 84 has an elongated countersunk hole 843, and a fastener 86 is attached to the disk body 811. The fastener 86 drills the elongated countersunk hole 843 and connects to a column 8014 of the disk body 811. A resilient reset member 87 is fitted to the fastener 86 and is sandwiched between a head 861 of the fastener 86 and a step 8431 of the elongated countersunk hole 843. The fastener 86 can limit the rotation range of the rele...

Claims

1. An engagement base assembly, a seat plate assembly configured to receive an object; a locking mechanism including at least one locking member; the at least one locking member is disposed on the seat plate assembly and is slidable between a first locked position and a first unlocked position, and when the locking member is in the first locked position, the locking member can lock the object, and when the locking member is in the first unlocked position, the locking member can unlock the object.

2. the locking mechanism further includes at least one unlocking operation attached to the seat plate assembly and connected to the locking member, the unlocking operation being slidable between a second locked position and a second unlocked position; 2. The engagement table assembly according to claim 1, wherein when the unlocking operation portion is in the second lock position, the locking member is in the first lock position, and when the unlocking operation portion is operated to move from the second lock position to the second unlocked position, the locking member moves to the first unlocked position in accordance with the movement of the unlocking operation portion.

3. The engagement table assembly according to claim 2, characterized in that the unlocking operation portion and / or the locking member are provided with a second driving inclined surface, the unlocking operation portion and the locking member are operably connected by the second driving inclined surface, and the movement direction of the unlocking operation portion is perpendicular to the movement direction of the locking member.

4. 4. The engagement table assembly according to claim 3, wherein the locking member has an extension portion, the extension portion has an inclined hole, the second drive inclined surface is provided on a wall of the inclined hole, and the unlocking operation portion has a drive pin attached thereto that slidably cooperates with the inclined hole.

5. 2. The engagement table assembly according to claim 1, wherein the locking mechanism includes two first locking members connected by a linkage device, and when one of the first locking members receives a force and moves to the first unlocked position, the linkage device drives the other first locking member to move toward the first unlocked position in synchronization.

6. the two first locking members are provided on the same side of the seat plate assembly; the two first locking members move along the same direction to switch to the first locking position or the first unlocking position, or the two first locking members move along opposite directions to switch to the first locking position or the first unlocking position; 6. The engagement platform assembly of claim 5, further comprising at least one resilient device that applies a force to the first locking member to move it to the first locking position.

7. 6. The engagement table assembly of claim 5, wherein the linkage device includes a linkage assembly connected between the two first locking members, and when either of the first locking members receives a force and moves between the first unlocked position and the first locked position, the linkage device drives the other first locking member to move synchronously between the first unlocked position and the first locked position.

8. 8. The engagement table assembly according to claim 7, wherein the linkage assembly includes a fixed connection point located between the two first locking members and two pivot shafts located on either side of the fixed connection point, the linkage assembly being pivotally connected to the two first locking members via the two pivot shafts, and when either of the first locking members moves, the two pivot shafts move in opposite directions, thereby synchronously moving the two first locking members along directions opposite to each other.

9. the linkage assembly includes a first link rod, a second link rod, a third link rod, and a fourth link rod, the first link rod, the second link rod, the third link rod, and the fourth link rod being connected two by two to form four connection points, one of the four connection points being a fixed connection point, and the fixed connection point being fixed to the seat plate assembly, the connection point opposite to the fixed connection point being a central connection point, and two link rods of the first link rod, the second link rod, the third link rod, and the fourth link rod connected to the central connection point being connected to the two first locking members, respectively; 8. The engagement table assembly according to claim 7, wherein a line connecting the fixed connection point and the central connection point is perpendicular to a direction of movement of the two first locking members.

10. 7. The engagement table assembly according to claim 6, wherein the locking mechanism includes two second locking members, the two second locking members being provided on the other side of the seat plate assembly and being parallel to the two first locking members, and the two second locking members having the same configuration as the two first locking members.

11. 7. The engagement table assembly according to claim 6, wherein the locking mechanism includes two second locking members, the two second locking members being provided on the other side of the seat plate assembly and parallel to the two first locking members, the two first locking members and the two second locking members being connected by the linkage device, and the linkage device allowing the two first locking members and the two second locking members to move to the first unlocked position in synchronization.

12. the locking mechanism includes at least one first locking member and at least one second locking member, and a moving direction of the at least one first locking member is parallel to a moving direction of the at least one second locking member; 2. The engagement table assembly according to claim 1, wherein the first locking member and the second locking member, which are diagonally opposite to each other, of the at least one first locking member and the at least one second locking member are connected by a linkage device, and the linkage device allows the first locking member and the second locking member, which are connected to each other, to move in opposite directions to be synchronously switched to the first unlocked position.

13. The linkage device includes a linkage member that is a link rod or a pulling member, and the first locking member and the second locking member that are diagonally positioned are connected by the linkage member; and / or 13. The engagement platform assembly of claim 12, further comprising at least one resilient device that applies a force to the first locking member and / or the second locking member to move them to the first locking position.

14. 14. The engagement table assembly of claim 13, wherein the locking mechanism includes two first locking members and two second locking members, the two first locking members and the two second locking members being connected by two of the linkage members.

15. 15. The engagement base assembly according to claim 14, wherein the two linkage members are link rods, and the two linkage members are arranged to cross each other.

16. The two linkage members are pivotally connected at their intersection points, and / or 16. The engagement platform assembly of claim 15, wherein connection points between the two linkage members and the two second locking members define an angle with respect to an intersection point of the two linkage members, the angle decreasing as the locking members move from the first locked position toward the first unlocked position.

17. 2. The engagement table assembly according to claim 1, further comprising two support frames for supporting the seat plate assembly, the two support frames being respectively provided on the left and right sides of the seat plate assembly, and each of the support frames comprising a longitudinal rod, a connecting rod and a shock absorbing rod connected to form a triangular structure.

18. 18. The engagement base assembly of claim 17, wherein the longitudinal rod is installed below the seat plate assembly and fixedly connected to the seat plate assembly, a first end of the connecting rod is connected to a first end of the longitudinal rod, a second end of the connecting rod is connected to a first end of the shock absorbing rod, and a second end of the shock absorbing rod is connected to the longitudinal rod, and the shock absorbing rod has elasticity to provide cushioning support to the seat plate assembly.

19. the engagement platform assembly is mounted on a foldable frame; 19. The engagement platform assembly of claim 18, wherein each of the support frames further includes a first connecting member and a second connecting member, a first end of the first connecting member and a first end of the second connecting member each pivotally connected to a second end of the connecting rod, and a second end of the first connecting member, a second end of the second connecting member and a first end of the connecting rod each pivotally connected to different rods of the frames that are folded relative to each other.

20. 19. The engagement platform assembly of claim 18, wherein a first connecting rod is connected between the longitudinal rods of the two support frames and / or a second connecting rod is connected between the connecting rods of the two support frames.

21. the longitudinal rod includes a position limiting finger, the position limiting finger being provided at a first end of the longitudinal rod, the position limiting finger abutting the connecting rod to limit an angle of downward pivoting of the longitudinal rod relative to the connecting rod; and / or 19. The engagement platform assembly of claim 18, wherein the longitudinal rod includes a position limiting protrusion, the position limiting protrusion being provided at a first end of the longitudinal rod, and the position limiting protrusion abuts the connecting rod to limit an angle at which the longitudinal rod can pivot upward relative to the connecting rod.

22. 20. The engagement platform assembly of claim 18, wherein the support frame further includes a position limiting member, a first end of the position limiting member slidably connected to the longitudinal rod, and a second end of the position limiting member pivotally attached to the connecting rod.

23. the engagement base assembly further includes a retention mechanism that retains the locking member in the first unlocked position; The holding mechanism includes: a touch button provided on the sheet plate assembly, the touch button being movable vertically relative to the sheet plate assembly so as to allow at least a portion of the touch button to protrude upward relative to the sheet plate assembly; a buckle portion connected to the touch button; a reset member provided between the touch button and the seat plate assembly, the reset member driving the touch button to move upward so as to protrude upward relative to the seat plate assembly; 2. The engagement table assembly according to claim 1, wherein when the object is placed on the sheet plate assembly, the touch button moves downward by being pressed by the object, the buckle portion moves downward along with the touch button, and when the locking member moves from the first lock position to the first unlocked position, a retention hook of the locking member engages with the buckle portion, and the locking member is held in the first unlocked position.

24. the buckle portion is movable in a direction perpendicular to the touch button, 24. The engagement base assembly of claim 23, wherein the holding mechanism further includes an elastic member disposed between the touch button and the buckle portion, the elastic member driving the buckle portion to move downward relative to the touch button.

25. the engagement platform assembly includes at least one engagement passage that engages with at least one engagement member of the object; 2. The engagement table assembly of claim 1, wherein when the locking member is in the first locked position, the locking member extends into the corresponding engagement passage to lock the corresponding engagement member, and when the locking member is in the first unlocked position, the locking member retracts relative to the engagement passage to allow the engagement member to be removed from the engagement passage.

26. 26. The engagement platform assembly of claim 25, further comprising a retention mechanism that retains the locking member in the first unlocked position.

27. The holding mechanism includes: a movable member attached to a slide passage communicating with the engagement passage, the movable member having an abutment end protruding into the engagement passage and an engagement end spaced from the abutment end; a reset device that drives the abutment end to project into the engagement passage, 27. The engagement table assembly of claim 26, wherein when the engagement passage is engaged with the engagement member, the abutment end is pushed by the engagement member to retract from the engagement passage, and when the locking member moves to the first unlocked position, the engagement end engages with the locking member to lock the locking member in the first unlocked position.

28. 28. The engagement base assembly of claim 27, wherein the engagement end is provided with a first buckle portion, the locking member is provided with a second buckle portion, and when the engagement member engages with the engagement passage, the first buckle portion moves to a movement path of the second buckle portion, and when the locking member moves to the first unlocked position, the second buckle portion engages with the first buckle portion.

29. The engagement table assembly according to claim 28, characterized in that the locking member is provided with an elastic arm, the second buckle portion is provided on the elastic arm, and / or one of the first buckle portion and the second buckle portion is an engagement groove and the other is a wedge-shaped step.

30. 30. The engagement table assembly of claim 29, wherein the locking member is integrally formed with the elastic arm, or the elastic arm is fixed to the locking member by a fastener, and a rotation-preventing structure is provided between the elastic member and the locking member.

31. 28. The engagement base assembly of claim 27, wherein the reset device further includes a pull wire, a first reset member, and a sliding member, the pull wire being connected between the movable member and the sliding member, the first reset member abutting against the sliding member and driving the sliding member to reset, and when the sliding member is reset, the pull wire driving the abutment end to protrude into the engagement passage.

32. 32. The engagement base assembly of claim 31, wherein the sliding member has an engagement indication area that indicates the position of the movable member, the sliding member is attached to a hollow rod, and the rod is provided with an observation hole for observing the engagement indication area.

33. The movable member has a connecting portion located outside the slide passage, and the traction wire is supported by a guide bracket located outside the slide passage and connected to the connecting portion; 32. The engagement table assembly according to claim 31, wherein the direction of movement of the pull wire located between the connection portion and the guide bracket is parallel to the slide path.

34. the locking member has an alignment portion, and the movable member has a position limiting portion located outside the slide passage; 28. The engagement table assembly of claim 27, wherein when the engagement member is disengaged from the engagement passage, the reset device drives the movable member to move, moving the position limiting portion onto the movement path of the locking member and abutting the alignment portion, thereby holding the locking member in the first unlocked position, and when the engagement passage is engaged with the engagement member, the position limiting portion moves out of the movement path of the locking member to allow the locking member to move to the first locked position.

35. The engagement platform assembly is attached to a frame; 2. The engagement table assembly of claim 1, wherein the frame has at least one unlocking operation attached thereto, the at least one unlocking operation operably connected to the at least one locking member, and the at least one unlocking operation actuates the at least one locking member to move to the first unlocked position.

36. 36. The engagement platform assembly of claim 35, wherein the at least one unlocking operation has an unlocking identification area that indicates when the at least one locking member is in the first locked position or the first unlocked position.

37. 36. The engagement table assembly of claim 35, wherein the frame includes at least one wheel mounting portion for mounting a front wheel or a rear wheel, the at least one unlocking operation portion is slidably associated with the at least one wheel mounting portion, and the unlocking operation portion is connected to the at least one locking member via at least one towing rope.

38. 38. The engagement table assembly of claim 37, wherein the frame is provided with at least one guide mechanism for guiding the at least one towing rope, the at least one guide mechanism including at least one rotating member provided adjacent to the at least one unlocking operation portion.

39. 38. The engagement table assembly of claim 37, wherein the unlocking operation portion has a first drive inclined surface, the first drive inclined surface being inclined with respect to a sliding direction of the unlocking operation portion, and the end of the towing rope abuts against the first drive inclined surface so as to be able to slide along the first drive inclined surface.

40. the unlocking operation portion includes a first position limiting wall, and a first engagement structure is formed between the first position limiting wall and the first driving inclined surface; a second position limiting wall is provided within the wheel mounting portion, and a second engagement structure is formed on the second position limiting wall; 40. The engagement platform assembly of claim 39, wherein the first driving ramp is between the first position limiting wall and the second position limiting wall, and an end of the towing rope is installed to engage with the first engagement structure or the second engagement structure.

41. 40. The engagement table assembly of claim 39, wherein the wheel mounting portion is provided with a first guide inclined surface, an angle is formed between the first guide inclined surface and the first drive inclined surface, and the end of the tow rope abuts the first drive inclined surface and the first guide inclined surface within the angle.

42. the locking mechanism includes at least two locking members connected by a linkage device, the linkage device enabling the at least two locking members to move synchronously to the first unlocked position; 36. The engagement table assembly of claim 35, wherein the frame is provided with an unlocked state synchronization mechanism and at least two unlocking operation units, the at least two unlocking operation units being respectively connected to the at least two locking members, and the unlocked state synchronization mechanism enables the at least two unlocking operation units to simultaneously enter a state in which they unlock the at least two locking members.

43. 43. The engagement table assembly of claim 42, wherein the at least two unlocking operating portions are respectively connected to the at least two locking members via at least two towing ropes, the frame includes at least two wheel mounting portions for mounting front or rear wheels, and the at least two unlocking operating portions are slidably mounted to the at least two wheel mounting portions.

44. the at least two unlocking operation parts each have a first drive inclined surface, the first drive inclined surface is inclined with respect to a sliding direction of the unlocking operation part, and the at least two unlocking operation parts each abut against an end part of the at least two towing ropes via the first drive inclined surface; 44. The engagement table assembly of claim 43, wherein the unlocked state synchronization mechanism includes at least two second reset members, each of which abuts against a corresponding end of the tow rope and drives the end of the tow rope away from the first drive ramp to slide the corresponding unlock operating portion downward.

45. the sheet plate assembly includes a first sheet plate assembly and a second sheet plate assembly; the locking mechanism includes a first locking mechanism and a second locking mechanism, the first locking mechanism is provided on the first seat plate assembly, the second locking mechanism is provided on the second seat plate assembly, and both the first locking mechanism and the second locking mechanism include the at least one locking member; the first seat plate assembly and the second seat plate assembly are rotatable relative to each other about a rotation axis so that the engagement base assembly can be in an unfolded state or a folded state; The engagement platform assembly of claim 1 , wherein the engagement platform assembly supports the object and the at least one locking member locks the object when the engagement platform assembly is in the deployed state.

46. 46. ​​The engagement base assembly of claim 45, wherein the seat plate assembly is attached to a foldable connection assembly, the connection assembly including the rotation axis, an expanded state of the connection assembly corresponds to an expanded state of the engagement base assembly, and a folded state of the connection assembly corresponds to a folded state of the engagement base assembly.

47. The connection assembly includes: a first connecting member to which the first seat plate assembly is attached; an auxiliary support member to which the second seat plate assembly is attached; 47. The engagement table assembly of claim 46, wherein the first coupling member and the auxiliary support member are pivotally connected via a pivot shaft, the centerline of the pivot shaft defining the axis of rotation.

48. the first coupling member includes two first tubes arranged in parallel, the auxiliary support member includes two second tubes arranged in parallel, and each of the first tubes is pivotally connected to the adjacent second tube by the pivot shaft; the first sheet plate assembly is connected between the two first tubes and extends along a first direction, and the second sheet plate assembly is connected between the two second tubes and extends along the first direction; 48. The engagement platform assembly of claim 47, wherein when the connection assembly is in the deployed state, the first sheet plate assembly and the second sheet plate assembly are spaced apart in a second direction, and the first direction and the second direction are not parallel.

49. when the connection assembly is in the deployed state, an angle between adjacent first and second tubes is approximately 180 degrees, and when the connection assembly is in the collapsed state, an angle between adjacent first and second tubes is an acute angle; and / or 49. The engagement platform assembly of claim 48, wherein the first sheet plate assembly is adjacent to the pivot shaft and the second sheet plate assembly is distant from the pivot shaft, and the first sheet plate assembly and the second sheet plate assembly are misaligned when the connection assembly is in a folded state.

50. 49. The engagement base assembly of claim 48, wherein the first seat plate assembly has sleeves on both ends, each sleeve being fitted onto a corresponding first tube, and the pivot shaft being drilled through the sleeve.

51. the first seat plate assembly has at least one first engagement channel, each of the first engagement channels extending in a second direction; the first locking mechanism has at least one first locking member, each of the first locking members moving in a first direction to switch between the first locked position and the first unlocked position, wherein in the first locked position, the first locking member is protruded into the corresponding first engagement channel, and in the first unlocked position, the first locking member is retracted from the corresponding first engagement channel; the second seat plate assembly has at least one second engagement channel, each of the second engagement channels extending in the second direction; the second locking mechanism has at least one second locking member, each of the second locking members moving in the first direction to switch between the first locked position and the first unlocked position, wherein in the first locked position, the second locking member protrudes into the corresponding second engagement channel, and in the first unlocked position, the second locking member retracts from the corresponding second engagement channel; 46. ​​The mating platform assembly of claim 45, wherein the first direction and the second direction are not parallel.

52. the first locking mechanism includes two first locking members connected by a first linkage assembly, and the first linkage assembly controls the two first locking members to move synchronously so that the two first locking members switch between the first locked position and the first unlocked position synchronously; and / or 52. The engagement table assembly of claim 51, wherein the second locking mechanism includes two second locking members connected by a second linkage assembly, the second linkage assembly controlling the synchronous movement of the two second locking members such that the two second locking members switch synchronously between the first locked position and the first unlocked position.

53. the at least one first locking member and the at least one second locking member are connected by at least one linkage member, and the first locking member and the second locking member connected to the same linkage member are switched between the first locked position and the first unlocked position synchronously; 52. The engagement platform assembly of claim 51, wherein the first locking member and the second locking member connected to the same linkage member move in opposite directions.

54. the first seat plate assembly is connected to a first pivot mount, the second seat plate assembly is connected to a second pivot mount, and the first pivot mount and the second pivot mount are pivotally connected to define the axis of rotation; 46. ​​The mating platform assembly of claim 45, wherein the direction of movement of the first locking member, the direction of movement of the second locking member, and the axis of rotation are parallel to one another.

55. the first seat plate assembly is attached to a first support frame, the first support frame is connected to the first pivot mount, the second seat plate assembly is attached to a second support frame, the second support frame is connected to the second pivot mount; 55. The engagement mount assembly of claim 54, wherein said first pivot mount and said second pivot mount are connected to a mount portion, said mount portion being removably connected to a frame.

56. A wheeled transportation device, 56. A wheeled transportation device comprising a frame and an engagement platform assembly according to any one of claims 1 to 55.

57. The wheeled transportation device described in claim 56, characterized in that a storage rack is installed on the frame, the storage rack has at least one storage cavity, and at least one clamping portion is installed at the opening of the at least one storage cavity, the clamping portion being made of an elastic material.

58. 1. A wheeled mobility device including a frame and a connection assembly, The frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and an upper support rod connected to a handlebar, and an upper end of the front support rod, an upper end of the rear support rod, and a lower end of the upper support rod are pivotally connected by pivot portions; A wheeled transportation device, wherein the connection assembly is pivotally attached to the frame, and the connection assembly folds when the frame folds.

59. The connection assembly includes: a first coupling member having a front end pivotally connected to a first pivot point of the front support rod; an auxiliary support member whose front end is pivotally connected to the second pivot point of the first connecting member and pivotally connected to the third pivot point of the rear support rod; a linkage member whose upper end is pivotally connected to the fourth pivot point of the upper support rod and whose lower end is pivotally connected to the fifth pivot point of the auxiliary support member; 59. The wheeled transportation device of claim 58, wherein when the frame is in an unfolded state, the first connecting member and the auxiliary support member are unfolded, and the second pivot point is located between the first pivot point and the third pivot point, and the fifth pivot point is located between the second pivot point and the third pivot point, and when the frame is in a folded state, the first connecting member and the auxiliary support member are folded.

60. 60. The wheeled transportation device of claim 59, wherein when the frame is unfolded, the first connecting member and the auxiliary support member are positioned horizontally, and the second pivot point, the third pivot point, and the fifth pivot point are essentially in a straight line.

61. 60. The wheeled transportation device of claim 59, wherein the connection assembly further includes a seat plate support member connected to the auxiliary support member and movable in synchronization with the auxiliary support member, and the seat plate support member mounts an engagement platform assembly that engages with the carrier.

62. the seat plate support member is provided inside the auxiliary support member, and the rear end of the first connecting member is located between the seat plate support member and the auxiliary support member; and / or 62. The wheeled transportation device of claim 61, wherein the engagement platform assembly is attached to the seat plate support member, and the engagement platform assembly includes a plurality of engagement points.

63. 60. The wheeled transportation device of claim 59, wherein the auxiliary support member is attached to an engagement platform assembly including a plurality of engagement points.

64. 60. The wheeled transportation device of claim 59, wherein the linkage member has a generally S-shaped configuration having, in order, a first segment, a second segment, and a third segment.

65. 59. A wheeled transportation device as described in claim 58, characterized in that the connection assembly is attached with an engagement base assembly including a seat plate assembly configured to receive and support a carrier, the seat plate assembly including a first extension portion and / or a second extension portion, the first extension portion extending rearward from the seat plate assembly and the second extension portion extending forward from the seat plate assembly.

66. 59. The wheeled transportation device of claim 58, wherein the connection assembly is attached to an engagement platform assembly including a plurality of engagement points, and when the frame is folded, the front support rod, the rear support rod, and the upper support rod are brought closer to each other, and the connection assembly pivots the engagement platform assembly, so that the front end of the engagement platform assembly pivots downward and the rear end of the engagement platform assembly pivots upward.

67. an engagement base assembly attached to the connection assembly; The engagement base assembly includes: a seat plate assembly configured to receive the carrier; a locking mechanism including at least one locking member; 59. The wheeled transportation device of claim 58, wherein the at least one locking member is provided on the seat plate assembly and is slidable between a first locked position and a first unlocked position, and when the locking member is in the first locked position, the locking member can lock the carrier, and when the locking member is in the first unlocked position, the locking member can unlock the carrier.

68. 1. A wheeled transportation device including a frame and an engagement platform assembly, The frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and an upper support rod connected to a handlebar, and an upper end of the front support rod, an upper end of the rear support rod, and a lower end of the upper support rod are pivotally connected by pivot portions; the mating platform assembly is attached to the frame and supports and locks the carrier; A wheeled transportation device, characterized in that, when the frame is unfolded, the center of gravity of the engagement base assembly is offset toward the rear wheel with respect to the pivot portion.

69. 69. The wheeled transportation device of claim 68, wherein when the frame is in an unfolded state, the center of gravity of the engagement platform assembly is adjacent to or located in a plane formed by the rear support rods.

70. 69. The wheeled transportation device of claim 68, wherein the engagement platform assembly is lower than the pivot portion when the frame is in the deployed state.

71. A wheeled transportation device including a frame and an engagement table assembly attached to the frame and extending along a left-right direction, The engagement base assembly includes: a seat plate assembly configured to receive the carrier; and a locking mechanism including at least one locking member that locks the carrier; A wheeled transportation device characterized in that the frame includes a first crossbar and / or a second crossbar extending along the left-right direction, the first crossbar being located a predetermined distance in front of the engagement base assembly and supporting the carrier in cooperation with the engagement base assembly, and the second crossbar being located a predetermined distance behind the engagement base assembly and supporting the carrier in cooperation with the engagement base assembly.

72. the frame includes a front support rod to which a front wheel is attached, a rear support rod to which a rear wheel is attached, and a connection assembly connected to the front support rod and the rear support rod, respectively, the front support rod including the first cross bar and / or the connection assembly including the second cross bar; And / or, the position of the second crossbar in the fore-and-aft direction is adjustable.

73. the front support rod is pivotally connected to the rear support rod, and the frame is foldable; the connection assembly includes a first coupling member and an auxiliary support member, the first coupling member pivotally connected to a first pivot point of the front support rod, the second pivot point of the first coupling member pivotally connected to the auxiliary support member, and the auxiliary support member pivotally connected to a third pivot point of the rear support rod; When the frame is in an unfolded state, the first connecting member and the auxiliary support member are unfolded, and the second pivot point is located between the first pivot point and the third pivot point; when the frame is in a folded state, the first connecting member and the auxiliary support member are folded; the engaging base assembly is connected to the first coupling member or the auxiliary support member; 73. The wheeled transportation device of claim 72, wherein the auxiliary support member includes the second crossbar.

74. The wheeled transportation device described in claim 73, characterized in that the engagement base assembly has a sleeve that is fitted onto the first connecting member or the auxiliary support member, and the pivot shaft of the second pivot point is drilled into the sleeve.

75. The wheeled transportation device of claim 73, wherein the frame further includes an upper support rod, the lower end of which is pivotally connected to the upper end of the front support rod and the upper end of the rear support rod, and the upper end of which is connected to a handlebar, and the connection assembly further includes a linkage member, the upper end of which is connected to the upper support rod, and the lower end of which is connected to the auxiliary support member.

76. A wheeled transport device as described in claim 71, characterized in that the first crossbar is provided with a first groove portion or a first positioning protrusion, and / or the second crossbar is provided with a second groove portion or a second positioning protrusion, and / or the engaging base assembly is provided with a third groove portion or a third positioning protrusion.

77. A wheeled transportation device as described in claim 71, characterized in that the first crossbar is attached with a first abutment member that abuts against the carrier, and / or the second crossbar is attached with a second abutment member that abuts against the carrier.

78. The engagement base assembly includes at least one engagement passage extending in a front-rear direction, and the at least one engagement passage is arranged in a row spaced apart from each other in the left-right direction; The wheeled transportation device described in claim 71, characterized in that the at least one locking member is slidable along the left-right direction, and the at least one locking member has a first locking position in which it protrudes into the at least one engagement passage to lock the carrier, and a first unlocking position in which it retracts from the at least one engagement passage to unlock the carrier.

79. the frame includes at least one wheel mounting portion for mounting a front wheel or a rear wheel, and the at least one unlocking operation portion slidably cooperates with the at least one wheel mounting portion; the at least one unlocking operation unit is connected to the at least one locking member via at least one towing rope and drives the at least one locking member to move to an unlocked position; The wheeled transportation device described in claim 71, characterized in that the at least one unlocking operation portion has an unlocking identification area, and the unlocking identification area indicates whether the at least one locking member is in a locked position or an unlocked position.

80. The wheeled transportation device of claim 71, wherein the engagement platform assembly further includes at least one retention mechanism, and when the at least one locking member is driven to an unlocked position, the at least one retention mechanism locks the at least one locking member in the unlocked position.

81. A wheeled transportation device, The wheeled moving device is The frame and an engagement platform assembly attached to the frame and configured to engage a carrier, the engagement platform assembly including at least one locking member; an indicator attached to the frame and / or the engagement platform assembly, for indicating an operating state of the wheeled transportation device; A wheeled transportation device characterized in that the at least one locking member has a locking position that locks the carrier and an unlocking position that unlocks the carrier, and the operating state includes whether the engagement base assembly is engaged with the carrier or not, and / or whether the at least one locking member locks the carrier or not.

82. the engagement platform assembly includes at least one engagement passage that engages with an engagement member of the carrier; the indicating device includes a first indicating device; The wheel-type transport device described in claim 81, characterized in that the first indicating device includes a movable member attached to a slide passage communicating with the engagement passage and having an abutment end protruding into the engagement passage, and a sliding member operably connected to the movable member and having an engagement indication area, wherein when the engagement passage engages with the engagement member, the abutment end is pushed by the engagement member to retract from the engagement passage, and the movable member drives the sliding member to slide, thereby changing the position of the engagement indication area.

83. The frame includes a hollow rod, the sliding member is slidable within the rod, the rod is provided with an observation hole for observing the engagement indication area, and the sliding member is connected to the movable member by a pull wire; 83. The wheeled transportation device of claim 82, wherein the first indicator device further includes a first reset member that abuts against the sliding member and drives the sliding member to reset, thereby driving the pull wire to protrude the abutment end into the engagement passage.

84. the indicating device includes a second indicating device; 82. The wheeled transportation device of claim 81, wherein the second indicating device includes at least one unlocking operation, the at least one unlocking operation being operably connected to the at least one locking member, and the at least one unlocking operation having an unlocking identification area indicating the position of the at least one locking member.

85. A wheeled transportation device, The wheeled moving device is a frame including at least two wheel mounting portions for mounting front or rear wheels; an engagement base assembly including: a seat plate assembly configured to receive a carrier; a locking mechanism provided on the seat plate assembly and including at least two locking members slidable between a locked position and an unlocked position; and a linkage device connected to the at least two locking members, causing the at least two locking members to move synchronously to the unlocked position; at least two unlocking operation units slidably attached to the at least two wheel mounting portions, respectively, and connected to the at least two locking members via at least two towing ropes, respectively; an unlocking state synchronization mechanism that enables the at least two unlocking operation units to be in a state that unlocks the at least two locking members simultaneously, A wheeled transportation device, characterized in that the locking member can lock the carrier when in the locked position, and can unlock the carrier when in the unlocked position.

86. the at least two locking members are connected by a linkage device, and when one of the locking members receives a force and moves to the unlocked position, the linkage device drives the other locking member to move toward the unlocked position in synchronization with the force; 86. A wheeled transportation device as described in claim 85, wherein the at least two unlocking operating units each have a first drive inclined surface, the at least two unlocking operating units each are operably connected to the ends of the at least two towing ropes via the first drive inclined surface, and the unlocked state synchronization mechanism includes at least two second reset members, each of which abuts against a corresponding end of the towing rope to push the end of the towing rope away from the first drive inclined surface.

87. a support frame for supporting a seat plate assembly, the support frame includes longitudinal rods, connecting rods and shock absorbing rods connected to form a triangular structure; the longitudinal rod is installed below the seat plate assembly and fixedly connected to the seat plate assembly, a first end of the connecting rod is connected to a first end of the longitudinal rod, a second end of the connecting rod is connected to a first end of the shock absorbing rod, and a second end of the shock absorbing rod is connected to the longitudinal rod, and the shock absorbing rod has elasticity to provide cushioning support to the seat plate assembly.

88. 88. The support frame of claim 87, further comprising a first connecting member and a second connecting member, wherein a first end of the first connecting member and a first end of the second connecting member are each pivotally connected to a second end of the connecting rod, and wherein the second end of the first connecting member, the second end of the second connecting member, and the first end of the connecting rod are each pivotally connected to different rods of the frame that are folded relative to each other.

89. the longitudinal rod includes a position limiting finger, the position limiting finger being provided at a first end of the longitudinal rod, the position limiting finger abutting the connecting rod to limit an angle of downward pivoting of the longitudinal rod relative to the connecting rod; and / or 88. The support frame of claim 87, wherein the longitudinal rod includes a position limiting protrusion, the position limiting protrusion being provided at a first end of the longitudinal rod, the position limiting protrusion abutting the connecting rod to limit an angle at which the longitudinal rod can pivot upward relative to the connecting rod.

90. 88. The support frame of claim 87, wherein the support frame further includes a position limiting member, a first end of the position limiting member slidably connected to the longitudinal rod, and a second end of the position limiting member pivotally attached to the connecting rod.

91. A locking mechanism comprising: The locking mechanism is two first locking members that move along opposite directions to move to a locked position or an unlocked position; a linkage assembly including a fixed connection point located between the two first locking members and two pivot shafts located on either side of the fixed connection point; the linkage assembly is pivotally connected to the two first locking members via the two pivot shafts, and the linkage assembly is arranged such that movement of either of the first locking members causes the two pivot shafts to move in opposite directions, thereby synchronously moving the two first locking members along opposite directions.

92. 92. The locking mechanism of claim 91, wherein the linkage assembly includes a first link rod, a second link rod, a third link rod, and a fourth link rod, wherein the first link rod, the second link rod, the third link rod, and the fourth link rod are connected two by two to form four connection points, one of the four connection points is a fixed connection point, and one of the four connection points opposite the fixed connection point is a central connection point, and two of the first link rod, the second link rod, the third link rod, and the fourth link rod connected to the central connection point are respectively connected to the two first locking members, and a line connecting the fixed connection point and the central connection point is perpendicular to a direction of movement of the two first locking members.

93. 92. The locking mechanism of claim 91, wherein the locking mechanism includes two second locking members, the two second locking members being parallel to the two first locking members, and diagonally opposite first and second locking members of the two first and two second locking members being connected by a linkage member.

94. 94. The locking mechanism of claim 93, wherein the linkage members are link rods, the two first locking members and the two second locking members are connected by the two link rods, and the two link rods are pivotally connected at their intersections.

95. A retention mechanism, The retention mechanism retains a locking member, which is slidable between a locked position and an unlocked position, in an unlocked position, the locking member being attached to a seat plate assembly; The holding mechanism includes: a movable member attached to a slide passage of the seat plate assembly and having an abutment end and an engagement end spaced from the abutment end; a reset device that drives the abutting end to move in a direction away from the engaging end, the abutting end can be pressed against a carrier placed on the sheet plate assembly, and the locking member locks the carrier; when the carrier is locked by the locking member, the abutment end is pushed by the carrier and moves in a direction toward the engagement end, and when the locking member moves to the unlocked position, the engagement end engages with the locking member to lock the locking member in the unlocked position.

96. the locking member has an alignment portion, and the movable member has a position limiting portion located outside the slide passage; 96. The holding mechanism of claim 95, wherein when the carrier releases its pressure on the movable member, the reset device drives the movable member to move, moving the position limiting portion onto the movement path of the locking member and abutting the alignment portion, thereby holding the locking member in the first unlocked position.

97. 96. The retention mechanism of claim 95, wherein when the carrier presses the abutting end of the movable member downward, the position limiting portion moves out of the movement path of the locking member to allow the locking member to move to the locked position.

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