Carrier, armrest mounting unit, height adjustment mechanism

Abstract

A carrier, an armrest mounting unit, and a height adjustment mechanism are provided. The carrier comprises a backrest assembly, a carrier frame switchable between a folded and unfolded state, a seat assembly movably positioned on the carrier frame, and a connecting rod assembly movably connected to each of the carrier frame, seat assembly, and backrest assembly. When the carrier frame is switched from the unfolded state to the folded state, the carrier frame drives the backrest assembly to fold toward the seat assembly via the connecting rod assembly.

Description

Cross-reference to Related Applications

[0001] This application claims priority to each of Chinese Patent Application No. 202310344611.7 filed on March 31, 2023, Chinese Patent Application No. 202310513910.9 filed on May 8, 2023, Chinese Patent Application No. 202310703429.6 filed on June 13, 2023, Chinese Patent Application No. 202311206991.4 filed on September 18, 2023, Chinese Patent Application No. 202311281801.5 filed on September 28, 2023, and Chinese Patent Application No. 202410348461.1 filed on March 25, 2024, and the entire contents of all of these are incorporated herein by reference in their entirety.

Technical Field

[0002] The present disclosure relates to a carrier, an armrest mounting unit, and a height adjustment mechanism.

Background Art

[0003] Carriers such as strollers, child dining chairs, and children's tricycles are increasingly being used by families who need them. However, existing carriers currently on the market have several drawbacks. For example, many strollers have foldable frames for storage and transport, but the folding mechanism is often complicated and difficult to use. Furthermore, during the folding process, the pressure applied can cause the backrest frame to swing towards the seat frame. In addition, some strollers have handle frames that can be switched between forward-facing and rear-facing positions. However, when switching the handle frame between forward-facing and rear-facing positions, the seat assembly moves, which can change the angle between the seat assembly and the backrest assembly, making it difficult for the user to adjust the angle. Furthermore, strollers usually have armrests that are detachably connected to two armrest rods, but the current common attachment and detachment structure between the armrests and armrest rods is complex. Furthermore, while strollers and other carriers sometimes come equipped with footrests, height adjustment is particularly necessary because each user has different leg lengths and sitting postures. This is important to reduce strain on the user's legs and improve seating comfort. However, existing height adjustment mechanisms are often complex in structure and cumbersome to operate, failing to meet consumer needs. [Overview of the Initiative]

[0004] In a first embodiment of the present disclosure, a carrier is provided comprising a backrest assembly, a carrier frame switchable between a folded and unfolded state, a seat assembly movably mounted on the carrier frame, and connecting rod assemblies movably connected to the carrier frame, the seat assembly, and the backrest assembly, respectively. When the carrier frame is switched from the unfolded state to the folded state, the carrier frame drives the backrest assembly to fold toward the seat assembly via the connecting rod assemblies.

[0005] In some embodiments, the connecting rod assembly includes a first connecting rod and a second connecting rod. The first connecting rod has a first movable portion and a first pivot portion. The first movable portion is movably connected to the seat assembly. The first pivot portion is pivotably connected to the carrier frame. The second connecting rod has a second movable portion and a second pivot portion. The second movable portion is movably connected to the first connecting rod, and the second pivot portion is pivotably connected to the backrest assembly.

[0006] In some embodiments, the carrier frame includes a seat tube extending in the longitudinal direction of the carrier. The seat assembly includes a movable frame slidably positioned on the seat tube. A first movable portion is movably connected to the movable frame.

[0007] In some embodiments, the movable frame is provided with a connecting portion. The connecting portion of the movable frame is provided with a guide groove. The first movable portion is inserted into the guide groove and is movable along the guide groove.

[0008] In some embodiments, the guide groove includes a first groove portion and a second groove portion that communicate with each other. The first groove portion extends in the direction of movement of the movable frame. The second groove portion extends in a direction intersecting the direction of extension of the first groove portion.

[0009] In some embodiments, the guide groove has a first end and a second end. When the carrier frame is in the unfolded state, the first movable part is located at the first end. When the carrier frame is in the folded state, the first movable part is located at the second end.

[0010] In some embodiments, a groove opening is provided in the connection portion of the movable frame. Guide grooves are provided on one or both of the opposing side walls of the groove opening and extend through them. The first movable portion is inserted into the groove opening and slide-fitted into the guide groove.

[0011] In some embodiments, the carrier frame includes a handle frame pivotably connected to the seat tube. The handle frame is operable to rotate relative to the seat tube so that the direction of travel of the carrier frame can be switched between a first direction of travel and a second direction of travel. While switching the direction of travel of the carrier frame from the first direction of travel to the second direction of travel, the handle frame drives a movable frame to move along the seat tube in the first direction of travel, and / or the handle frame drives a first connecting rod to move in the second direction of travel.

[0012] In some embodiments, the movable frame has an engaging portion. When the carrier frame is in the deployed state, the engaging portion engages with the second movable portion. While the handle frame is operated to change the direction of travel of the carrier frame, the engaging portion disengages from the second movable portion.

[0013] In some embodiments, the first connecting rod has a drive groove between the first movable portion and the first pivot portion. The second movable portion is inserted into the drive groove and is slidable along the drive groove.

[0014] In some embodiments, the backrest assembly includes a first backrest frame, a second backrest frame, and a backrest tube. The first end of the first backrest frame is pivotably connected to a second pivot portion of a second connecting rod. The second end of the first backrest frame is pivotably connected to the first end of the second backrest frame. The second end of the second backrest frame is pivotably connected to the first end of the backrest tube. The second end of the backrest tube, the portion of the second connecting rod between the second moving portion and the second pivot portion, and the movable frame are pivotally connected by a first connecting shaft.

[0015] In some embodiments, the second connecting rod includes a first rod portion and a second rod portion connected to each other and forming an angle between them. The second movable portion is located at the end of the first rod portion away from the second rod portion. The second pivot portion is located on the second rod portion. The first connecting shaft is located at the connection between the first rod portion and the second rod portion.

[0016] In some embodiments, the backrest assembly further comprises a connecting harness and a harness adjuster. A connecting rod assembly is provided on each side of the carrier frame. One end of the connecting harness is connected to the end of a second rod section, away from a first rod section, on one side of the carrier frame. The other end of the connecting harness crosses the backrest tube on the side opposite to the seat assembly and is connected to the end of the second rod section, away from the first rod section, on the other side of the carrier frame. A harness adjuster is positioned on the connecting harness to adjust the length of the connecting harness.

[0017] In some embodiments, the backrest assembly further includes a limiting plate pivotably connected between the backrest tube and a second connecting rod via a first connecting shaft.

[0018] In some embodiments, the carrier frame includes a handle frame and an auxiliary frame movably connected to the handle frame. A connecting rod assembly is pivotally connected to the auxiliary frame. The handle frame is operable to fold the carrier frame and to fold the backrest assembly toward the seat assembly via the connection between the connecting rod assembly and the auxiliary frame and the seat assembly.

[0019] In a second embodiment of the present disclosure, a carrier is provided that includes a foldable carrier frame, a limiting block disposed on the carrier frame and having an extendable portion, a movable frame disposed on the carrier frame, and a backrest frame disposed on the carrier frame and having a movable end. When the carrier frame is switched from an unfolded state to a folded state, the backrest frame rotates in a first direction toward the movable frame, and the extendable portion contacts the movable end and applies force in a second direction opposite to the first direction.

[0020] In some embodiments, the limiting block further includes a limiting body fixed to a carrier frame. The extension portion includes a sliding block used to slide-fit with the limiting body and abut against the moving end, and an elastic return member sandwiched between the limiting body and the sliding block.

[0021] In some embodiments, the limiting body has a guide groove. The extension portion is mounted within the guide groove. The slide block is elastically extendable and retractable relative to the groove opening of the guide groove under the action of an elastic return member.

[0022] In some embodiments, an outwardly extending support portion is provided at the lower part of the groove opening of the guide groove, and / or a limiting projection is provided at the upper part of the groove opening of the guide groove.

[0023] In some embodiments, a limiting mechanism is provided between the slide block and the limiting body to restrict the sliding movement of the slide block. The limiting mechanism includes a limiting hole provided on one side of the groove wall of the guide groove and the slide block, and a limiting projection provided on the other side of the groove wall of the guide groove and the slide block. The limiting projection slides into the limiting hole.

[0024] In some embodiments, the limiting body has a first end face. When the carrier frame is in the deployed state, the first end face abuts against the movable end to limit the rotation of the backrest frame.

[0025] In some embodiments, the first end face is located above the telescopic part, and / or the limiting protrusion is provided at the connection part between the end face of the groove opening and the first end face.

[0026] In some embodiments, the limiting block further includes a limiting body fixed to the carrier frame. The telescopic part is attached to the limiting body and is elastically deformable.

[0027] In some embodiments, the movable frame is movably arranged on the carrier frame. When the carrier frame is in the deployed state, the moving end is sandwiched between the limiting block and the movable frame. During the process of switching the carrier frame to the folded state, the movable frame moves away from the limiting block to enable the backrest frame to rotate.

[0028] In some embodiments, the carrier frame includes a seat tube. The limiting block is fixed to the seat tube. The movable frame is in sliding fit with the seat tube. The backrest frame is pivotally connected to the movable frame. The carrier frame further includes a handle frame and a drive assembly. When the handle frame rotates, it drives the movable frame to move along the seat tube through the drive assembly.

[0029] In some embodiments, the drive assembly includes a first drive rod, a second drive rod, and a pivot shaft. The pivot shaft is inserted through both the first drive rod and the handle frame. The second drive rod is pivotally connected to the movable frame. When the handle frame rotates, it drives the first drive rod to rotate through the pivot shaft. The limiting block further includes a limiting body. A hole is provided in the limiting body. The pivot shaft is further inserted through the hole of the limiting body to limit the movement of the limiting block relative to the seat tube.

[0030] In a third aspect of the present disclosure, a carrier is provided that includes a carrier frame, a seat assembly attached to the carrier frame and movable in the longitudinal direction of the carrier relative to the carrier frame between a first position and a second position, a backrest assembly attached to the seat assembly and angle-adjustable relative to the seat assembly, a handle frame pivotally connected to the carrier frame, and a linkage mechanism. When the handle frame pivots relative to the carrier frame, the handle frame drives the seat assembly to move in the longitudinal direction of the carrier relative to the carrier frame. The linkage mechanism is disposed on a side portion of the seat assembly and connected to the backrest assembly. The linkage mechanism keeps the angle adjustment range of the backrest assembly relative to the seat assembly unchanged when the seat assembly moves between the first position and the second position.

[0031] In some embodiments, the backrest assembly includes a backrest tube and a harness. A lower portion of the backrest tube is pivotally connected to a movable frame. An end of the harness is connected to the linkage mechanism. The backrest tube is supported by the harness. The linkage mechanism is also connected to the seat assembly. The linkage mechanism moves the end of the harness synchronously with the seat assembly in the longitudinal direction of the carrier frame.

[0032] In some embodiments, the linkage mechanism includes a connecting rod. A first end of the connecting rod is connected to the seat assembly. A second end of the connecting rod is connected to the end of the harness. When the seat assembly moves in the longitudinal direction of the carrier frame, the seat assembly drives the end of the harness to move in the longitudinal direction of the carrier frame via the connecting rod.

[0033] In some embodiments, the carrier frame includes two lateral frames and a seat tube mounted between the two lateral frames. The seat assembly includes a movable frame mounted on the seat tube. When the handle frame pivots relative to the carrier frame, the handle frame drives the movable frame to move in the longitudinal direction of the carrier frame relative to the seat tube. The first end of the connecting rod is connected to the movable frame. The second end of the connecting rod is connected to the lateral frame so as to be movable in the longitudinal direction of the carrier frame. When the movable frame moves in the longitudinal direction of the carrier frame relative to the seat tube, the movable frame drives the end of the harness to move in the longitudinal direction of the carrier frame via the connecting rod.

[0034] In some embodiments, the connecting rod is positioned between the movable frame and the lateral frame. The movable frame is provided with a recess on the side facing the connecting rod. The first end of the connecting rod is housed in the recess.

[0035] In some embodiments, the connecting rod is provided with a first projection on the side of the connecting rod facing the movable frame. A socket or through hole is provided in a recess of the movable frame. The first projection is housed in the socket or through hole.

[0036] In some embodiments, the movable frame is provided with a second projection on the side of the movable frame away from the connecting rod. The connecting mechanism 500 further includes an elastic member. One end of the elastic member is wound around the periphery of the second projection, and the other end of the elastic member is locked to the side of the connecting rod away from the movable frame.

[0037] In some embodiments, the backrest assembly includes a backrest tube and a harness. The lower portion of the backrest tube is pivotably connected to a movable frame. The ends of the harness are connected to a coupling mechanism. The backrest tube is supported by the harness. The coupling mechanism includes a transmission assembly and a sliding member. The sliding member is mounted to the carrier frame so as to be slidable in the longitudinal direction of the carrier frame and is connected to the ends of the harness. The transmission assembly is connected to the handle frame and the sliding member, respectively, and converts the rotation of the handle frame into the movement of the sliding member in the longitudinal direction of the carrier frame, thereby moving the ends of the harness in the longitudinal direction of the carrier frame in sync with the seat assembly.

[0038] In some embodiments, the sliding member includes a sliding portion and a connecting portion. The connecting portion is connected to the transmission assembly. The sliding portion is fixedly connected to the end of the harness. The transmission assembly drives the sliding portion to move in the longitudinal direction of the carrier frame via the connecting portion.

[0039] In some embodiments, the transmission assembly includes a link gear. The sliding portion is provided with teeth. The handle frame is fixedly connected to a pivot shaft inserted through the carrier frame. The pivot shaft is connected to the link gear and drives the link gear to rotate. The link gear engages with the teeth of the sliding portion and the rotation of the link gear drives the sliding portion to move in the front-rear direction of the carrier frame.

[0040] In some embodiments, the transmission assembly further includes a driven gear and an output gear. A link gear engages with the driven gear. The driven gear further engages with the output gear. The output gear further engages with the teeth of a sliding portion.

[0041] In some embodiments, the transmission assembly further includes a drive wheel and a traction member. The drive wheel is sleeve-fitted to the outside of the pivot shaft and is rotatable with the pivot shaft. The traction member is connected to each of the drive wheel and the link gear. When the drive wheel rotates, it drives the link gear to rotate via the traction member.

[0042] In some embodiments, the traction member is a cable. One end of the cable is fixed to a first position on the link gear. The other end of the cable extends to the drive wheel, winds around the drive wheel, and then returns to the link gear and is fixed to a second position on the opposite side of the first position. The portion of the cable wound around the drive wheel is further fixed to the position of the drive wheel. As the drive wheel rotates, the length of the portions of the cable on both sides of the drive wheel and the link gear changes, causing the link gear to rotate.

[0043] In some embodiments, the carrier frame has a cavity. The carrier further includes a mounting sheet positioned within the cavity of the carrier frame. The mounting sheet includes a housing. The inner wall of the housing is provided with baffles for dividing the space within the housing into a first accommodation space and a second accommodation space. The sliding portion of the sliding member is positioned in the first accommodation space and is slidably positioned on the baffles. The transmission assembly is positioned in the second accommodation space. The mounting sheet also includes a cover that is attached to the housing 1710 and, together with the housing, defines the second accommodation space. The transmission assembly is positioned between the housing and the cover. One end of the connecting portion of the sliding member extends beyond the upper edge of the cover to the outside of the cover. The cover defines an opening through which the transmission assembly connects to the connecting portion of the sliding member.

[0044] In some embodiments, the carrier frame includes two lateral frames. The seat assembly is mounted between the two lateral frames. The lateral frames are provided with sliding grooves that extend in the longitudinal direction of the carrier frame. The ends of the harness are slidably mounted in the sliding grooves. When the handle frame pivots relative to the carrier frame, the coupling mechanism causes the ends of the harness to slide in the longitudinal direction of the carrier frame within the sliding grooves.

[0045] In some embodiments, the backrest assembly includes a backrest tube and a harness. The lower portion of the backrest tube is pivotably connected to the seat assembly. The ends of the harness are connected to a coupling mechanism. The backrest tube is supported by the harness. The coupling mechanism includes a guide member and a connecting member. The guide member is attached to the carrier frame. The ends of the harness wrap around the guide member and connect to the connecting member. The connecting member is further connected to the seat assembly and is movable along with the seat assembly in the front-rear direction of the carrier frame, driving the backrest tube to move synchronously with the seat assembly via the harness. The connecting member may be a separate member or may be integrated with the harness.

[0046] A fourth aspect of the present disclosure provides an armrest mounting unit including a first connecting sheet having an engaged member, a first magnetic element attached to the first connecting sheet, a second connecting sheet having an engaged member, and a second magnetic element attached to the second connecting sheet. The first connecting sheet and the second connecting sheet are detachably connected via both a detachable snap fitting between the engaged member and the engaged member and magnetic attraction between the first magnetic element and the second magnetic element.

[0047] In some embodiments, the second connecting sheet has a first accommodating space and an insertion hole communicating with the first accommodating space. The engaging member includes at least one elastic arm positioned within the first accommodating space. The engaged member is adapted to move in and out of the first accommodating space through the insertion hole. The engaged member is provided with at least one engaging groove. The at least one engaging groove is adapted to snap-fit ​​with at least one elastic arm.

[0048] In some embodiments, the engaged member includes a projection. At least one engagement groove is provided on the projection. The projection is adapted to protrude into the second connecting sheet, enabling a snap-fit ​​between at least one engagement groove and at least one elastic arm.

[0049] In some embodiments, the first connecting sheet is provided with a rotation-restricting platform. The rotation-restricting platform is non-rotatably fitted into the insertion hole. The projection is positioned on the rotation-restricting platform. The first connecting sheet has a first housing cavity within the projection, and the first magnetic element is mounted within the first housing cavity.

[0050] In some embodiments, at least one engagement groove includes an annular groove provided on the outer circumferential wall of the projection. At least one elastic arm includes two elastic arms facing each other and forms a second accommodation space for the projection. When the projection is located within the second accommodation space, the two elastic arms embrace the annular groove.

[0051] In some embodiments, the support sheet is positioned within the first accommodation space of the second connecting sheet. The first ends of the two elastic arms are connected to each other by a fixing portion fixed to the support sheet. The second ends of the two elastic arms are opposite to each other and spaced apart from each other. The support sheet is provided with a spacer member located near and between the first ends of the two elastic arms. The spacer member is adapted to abut against the two elastic arms.

[0052] In some embodiments, the second connecting sheet further comprises a release member and an elastic return member. The release member is operably coupled to the engaging member to drive at least one elastic arm to disengage from the engaging groove. The elastic return member is adapted to return the release member to its original position.

[0053] In some embodiments, the release member has at least one pressing portion. The at least one elastic arm has at least one contact portion. Each of the at least one pressing portion is adapted to press against a corresponding contact portion of the at least one contact portion to release the snap engagement between the at least one elastic arm and the at least one engagement groove.

[0054] In some embodiments, a convex platform is arranged in the second accommodation space. The convex platform has a guide surface facing the contact portion. The pressing portion is sandwiched between the guide surface and the contact portion. The pressing portion has a sliding surface that slides into place with the guide surface.

[0055] In some embodiments, the first connecting sheet includes a connecting body and a mounting sheet. The mounting sheet is attached to the connecting body by a fastening mechanism or is integrated with the connecting body. The engaging member is provided on the mounting sheet. The connecting body is integrated with the armrest rod or is attached to the armrest rod. The second connecting sheet is pivotably connected to the armrest body via a pivot shaft. The axial direction of the pivot shaft is perpendicular to the insertion and withdrawal direction of the engaged member.

[0056] A fifth aspect of this disclosure provides a height adjustment mechanism for a carrier, comprising a front leg support assembly, a footrest plate slidable in the height direction along the front leg support assembly, and a locking assembly provided between the front leg support assembly and the footrest plate. The locking assembly is switchable between a locked state and an unlocked state. When the locking assembly is in the locked state, the footrest plate is fixed at a height position relative to the front leg support assembly, and / or the footrest plate is operable to move in a first direction. When the locking assembly is in the unlocked state, the footrest plate is operable to move in a first or second direction. The first and second directions are opposite to each other and parallel to the height direction.

[0057] In some embodiments, the lock assembly includes a first lock groove, which is a unidirectional lock groove provided on the front leg support assembly for restricting the movement of the footrest plate in a second direction, and / or a second lock groove, which is a bidirectional lock groove provided on the front leg support assembly for restricting the movement of the footrest plate in both the first and second directions, and a locking member, which is movably positioned at the end of the footrest plate and is switchable between a locked position and an unlocked position. When the locking member is in the locked position, the locking member protrudes from the end of the footrest plate and is inserted into the first lock groove or the second lock groove. When the locking member is in the unlocked position, the locking member is disengaged from the first lock groove or the second lock groove.

[0058] In some embodiments, the lock assembly further includes an operating member, a connecting member, a first return member, and a second return member. The operating member is operably positioned on the footrest plate and is drivably connected to the locking member. The operating member is operable to drive the locking member to switch from the locked position to the unlocked position. The first end of the connecting member is drivably connected to the operating member, and the second end of the connecting member is fixedly connected to the locking member. The operating member is operable to drive the locking member to switch from the locked position to the unlocked position via the connecting member. The first return member is positioned between the operating member and the footrest plate. The first return member is adapted to bias the operating member so that it moves the operating member toward the locked position. The second return member is provided between the locking member and the footrest plate. The second return member is adapted to bias the locking member so that it moves toward the locked position.

[0059] In some embodiments, the first lock groove has a first inclined contact surface inside. The first inclined contact surface gradually inclines toward the footrest plate side along a first direction. The second lock groove has a first limiting wall and a second limiting wall located on opposite sides of the second lock groove in the height direction. The second lock groove is located on the first direction side of the first lock groove.

[0060] In some embodiments, the footrest plate has a hollow internal cavity. A locking member and a connecting member are movably arranged within the hollow internal cavity. A portion of the operating member protrudes into the hollow internal cavity and connects to the connecting member, while the other portion of the operating member protrudes outside the hollow internal cavity and is operated. The portion of the operating member protruding into the hollow internal cavity is provided with a drive groove extending in a direction intersecting both the direction of movement of the operating member and the direction of movement of the locking member. The first end of the connecting member is inserted into the drive groove and is movable along the drive groove. The operating member is provided with a mounting cavity that communicates with the hollow internal cavity. A first return member is positioned between the upper wall of the hollow internal cavity and the lower wall of the mounting cavity and is elastically expandable and contractible.

[0061] In some embodiments, a first convex platform is provided in the portion of the hollow internal cavity of the footrest plate where the locking member is attached. A second convex platform is provided annularly on the outside of the locking member, opposite to the first convex platform. The second convex platform is located on the side of the first convex platform closer to the front leg support assembly. A second return member is sleeve-fitted to the outside of the locking member, and both ends of the second return member abut against the first and second convex platforms, respectively.

[0062] In some embodiments, the front leg support assembly includes a front leg support rod on the carrier frame of the carrier, and a guide member fixed to the side of the front leg support rod facing the footrest plate. The lock assembly is positioned between the guide member and the footrest plate.

[0063] In some embodiments, the front leg support assembly is provided with a guide groove extending in the direction of movement of the footrest plate. The footrest plate includes a footrest body that supports the user's foot and a clamp member integrated with the footrest body. At least a portion of the clamp member is inserted into the guide groove and is slidable along the guide groove.

[0064] In some embodiments, the height adjustment mechanism further includes a clamping member positioned between the front leg support assembly and the footrest plate. The clamping member is connected to the footrest plate in a telescopic or movable manner. The front leg support assembly is provided with guide grooves extending in the direction of movement of the footrest plate. The clamping member includes a clamp body and a connecting portion that are connected to each other and form an angle between them. At least a portion of the clamp body is inserted into the guide groove and is slidable along the guide groove. Notches are provided at the ends of the footrest plate. The connecting portion of the clamping member is inserted into the notches.

[0065] In some embodiments, the lock assembly further includes a third lock groove located on the front leg support assembly and on the second direction side of the first lock groove. The third lock groove has a second inclined contact surface that gradually slopes toward the footrest plate side along the first direction. The third lock groove further has a mounting opening opposite the second inclined contact surface. A locking member can be inserted into the third lock groove through the mounting opening.

[0066] In some embodiments, the height adjustment mechanism further includes a limiting member connected to the front leg support assembly and located on the second-direction side of the third locking groove. When the locking member is inserted into the third locking groove, the limiting member contacts the footrest plate to restrict the movement of the footrest plate in the second direction. [Brief explanation of the drawing]

[0067] The accompanying drawings constitute part of this disclosure and are used to provide a further understanding of this disclosure. The illustrated embodiments and their descriptions are for illustrative purposes only and do not unduly limit this disclosure.

[0068] [Figure 1] A schematic perspective view of a carrier relating to the first aspect of this disclosure is shown, where the carrier is in an unfolded state. [Figure 2] A schematic diagram of the carrier shown in Figure 1 is provided. [Figure 3] Figure 1 shows a schematic perspective view of the carrier drive assembly from a certain viewpoint. [Figure 4] Figure 1 shows a schematic perspective view of the drive assembly of the carrier from a different viewpoint. [Figure 5] A schematic perspective view of the carrier restriction block shown in Figure 1 is provided. [Figure 6] A schematic perspective view of the carrier shown in Figure 1, in a state between the deployed and folded states, is shown. [Figure 7] A schematic cross-sectional view of the carrier shown in Figure 1 is shown in another state between the unfolded and folded states. [Figure 8] A schematic perspective view of the carrier shown in Figure 1 in its folded state is shown. [Figure 9] A schematic diagram of a carrier relating to a second aspect of this disclosure is shown, where the carrier frame is in an unfolded state. [Figure 10] Figure 9 shows an exploded view of the carrier. [Figure 11] Figure 9 shows a schematic structural diagram of the carrier from a different viewpoint, as well as a partial close-up view of a portion of the seat assembly and the connecting rod assembly. [Figure 12] Figure 9 shows a schematic diagram of the carrier structure, with the front leg frame, rear leg frame, and wheel assembly removed. [Figure 13] Figure 12 shows an exploded view of the carrier at position A. [Figure 14] Figure 9 shows a side cross-sectional view of the carrier and a close-up view of a portion of the seat assembly, connecting rod assembly, and backrest assembly, with the carrier frame in the unfolded state and the connecting harness at a first length. [Figure 15] Figure 9 shows a side cross-sectional view of the carrier, as well as a partial close-up of the seat assembly, connecting rod assembly, and backrest assembly, with the carrier frame in the unfolded state and the connecting harness at the second length. [Figure 16] Figure 15 shows a side cross-sectional view of the carrier with the handle frame orientation reversed, as well as close-up views of parts of the seat assembly, connecting rod assembly, and backrest assembly. [Figure 17a] Figure 9 shows a side cross-sectional view of the carrier, as well as enlarged views of parts of the seat assembly, connecting rod assembly, and backrest assembly, with the carrier frame in a folded state. [Figure 17b] Figure 17a shows the folded carrier from a different perspective. [Figure 18] A schematic structural perspective view of a first embodiment of a carrier according to a third aspect of this disclosure is shown, the carrier in a first operating state. [Figure 19]The diagram shows a schematic structural perspective view of a first embodiment of a carrier according to a third aspect of this disclosure, the carrier in a second operating state. [Figure 20] This diagram shows a schematic structural perspective view of a first embodiment of a carrier according to a third aspect of the present disclosure, with the front and rear leg frames removed. [Figure 21] This diagram shows a partially exploded view of a first embodiment of the carrier according to a third aspect of this disclosure, with the front and rear leg frames removed. [Figure 22] A magnified view of a portion of Figure 21 is shown. [Figure 23] This diagram shows a partially exploded view of the first embodiment of the carrier according to a third aspect of this disclosure, from a different perspective, with the front and rear leg frames removed. [Figure 24] A magnified view of a portion of Figure 23 is shown. [Figure 25] A schematic structural perspective view of a second embodiment of a carrier according to a third aspect of this disclosure is shown. [Figure 26] This shows a side cross-sectional view of a second embodiment of a carrier according to a third aspect of the present disclosure. [Figure 27] A magnified view of a portion of Figure 26 is shown. [Figure 28] Figure 27 shows a schematic perspective view of the carrier with some of its internal structures removed. [Figure 29] This shows a side view of a mounting sheet attached to an armrest rod in a second embodiment of a carrier according to a third aspect of the present disclosure. [Figure 30] This diagram shows a schematic perspective view of a mounting sheet and components attached to the mounting sheet according to a second embodiment of a carrier according to a third aspect of the present disclosure. [Figure 31] This diagram shows a schematic exploded view of a mounting sheet and components attached to the mounting sheet according to a second embodiment of a carrier according to a third aspect of the present disclosure. [Figure 32] This diagram shows a schematic exploded view from another perspective of a mounting sheet and components attached to the mounting sheet in a second embodiment of a carrier according to a third aspect of the present disclosure. [Figure 33] A schematic structural perspective view of a third embodiment of the carrier according to a third aspect of this disclosure is shown. [Figure 34] A magnified view of a portion of Figure 33 is shown. [Figure 35] A schematic perspective view of a carrier according to a fourth aspect of this disclosure is shown, and it includes an armrest mounting unit according to a fourth aspect of this disclosure. [Figure 36] Figure 35 shows a schematic perspective view of the carrier, illustrating the state in which the armrest body and armrest rod of the carrier frame are separated. [Figure 37] Figure 35 shows a schematic cross-sectional view of the carrier section CC, illustrating the state in which the first connecting sheet and the second connecting sheet of the armrest mounting unit are connected to each other. [Figure 38] Figure 20 shows a schematic diagram illustrating the state in which the first and second connecting sheets are separated from each other. [Figure 39] A schematic exploded view of the first connecting sheet of the armrest mounting unit according to a fourth aspect of this disclosure is shown. [Figure 40] A schematic diagram of the first connecting sheet of the armrest mounting unit according to a fourth aspect of this disclosure is shown. [Figure 41] A schematic exploded view of the second connecting sheet of the armrest mounting unit according to a fourth aspect of this disclosure is shown. [Figure 42] A schematic diagram of a further exploded view of the second connecting sheet of the armrest mounting unit according to a fourth aspect of this disclosure is shown. [Figure 43] Figure 35 shows a schematic cross-sectional view of the carrier's partial deadheading (DD). [Figure 44] A schematic diagram of the carrier relating to the fifth aspect of this disclosure is shown. [Figure 45] Figure 44 shows a schematic diagram of the carrier height adjustment mechanism. [Figure 46] Figure 45 shows a cross-sectional view along line AA and a cross-sectional view of the area enclosed by the dashed line. [Figure 47]Figure 45 shows a cross-sectional view along line BB and a cross-sectional view of the area enclosed by the dashed line. [Figure 48] Figure 44 shows a cross-sectional view of the carrier along line CC, with the footrest plate and lock assembly removed. [Figure 49] A schematic diagram of a height adjustment mechanism according to a fifth embodiment of this disclosure is shown. [Figure 50] Figure 49 shows a top view of the footrest plate of the height adjustment mechanism. [Figure 51] Figure 49 shows an exploded view of the footrest plate of the height adjustment mechanism. [Modes for carrying out the invention]

[0069] To further clarify the purpose, technical solutions, and advantages of this disclosure, the disclosure will be described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0070] When a component is referred to as being "fixed" to another component, that component may be directly fixed to the other component, or there may be an intervening component. Similarly, when a component is referred to as being "connected" to another component, that component may be directly connected to the other component, or there may be an intervening component. Terms such as "vertical," "horizontal," "up," "down," "left," and "right" used herein are for the purpose of describing specific embodiments and are not intended to limit the disclosure.

[0071] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of this disclosure. Terms used herein are for the purpose of describing specific embodiments and are not intended to limit this disclosure. The terms “and / or” as used herein encompass any and all combinations of one or more of the relevant enumerated items.

[0072] This disclosure provides a carrier, which may be a child carrier such as a stroller, child dining chair, or children's tricycle, or it may be a wheelchair, high chair, etc.

[0073] Unless otherwise explicitly stated and defined, the terms "front," "rear," "left," and "right" in the embodiments of this disclosure refer to the "front," "rear," "left," and "right" directions in a carrier such as a stroller in its unfolded state with a child seated facing forward. Arrows P and Q in the drawings indicate the "front" and "rear" directions, respectively, and arrows L and R indicate the "left" and "right" directions, respectively. These terms relating to directions are used to clarify the description of the embodiments of this disclosure and are not intended to unduly limit the scope of protection of this disclosure.

[0074] First aspect

[0075] Figure 1 shows a perspective view of the carrier 1000 in an unfolded state according to a first embodiment of the present disclosure. Figure 2 shows an exploded view of the carrier 1000. As shown in Figures 1 and 2, the carrier is described as a stroller as an example. The carrier may include a plurality of components, such as a carrier frame 100, a seat assembly 200, and a backrest assembly 400. In this embodiment, the structure of the carrier is substantially symmetrical with respect to a longitudinal central plane (which may also be called a "plane of symmetry," not shown). Naturally, in some alternative embodiments, the structure of the carrier may not be perfectly symmetrical. For example, the carrier may have an asymmetrical braking system.

[0076] Figures 1 and 2 show exemplary embodiments of a carrier frame 100, which may include multiple components such as a seat tube 110, a handle frame 120, an armrest frame 130, an auxiliary frame 140, a connecting frame 150, a front leg frame 160, and a rear leg frame 170. The carrier frame 100 is foldable. The folded state of the carrier frame 100 corresponds to the folded state of the carrier, and the unfolded state of the carrier frame 100 corresponds to the unfolded state of the carrier. Naturally, in some alternative embodiments, the carrier frame 100 may have a different form than that shown herein.

[0077] The structure of the carrier frame 100 according to the first aspect of this disclosure will be described below with reference to Figures 1 and 2.

[0078] The carrier frame 100 includes two seat tubes 110 on each side. Each seat tube 110 extends roughly along the front-to-rear direction of the carrier frame. The seat assembly 200 includes a movable frame 220 that is attached to each seat tube 110. The movable frame 220 slides into place with the seat tubes 110 located on the same side of the carrier frame. The seat assembly 200 also includes a seat frame 230 connected between the two movable frames 220. The seat frame 230 is used to support the child's buttocks directly or indirectly (via a seat cushion).

[0079] The handle frame 120 is generally U-shaped and includes a first handle rod 122 and a second handle rod 123 positioned on the left and right sides of the carrier frame, with the upper ends of the first and second handle rods 122 and 123 connected by a handle body 121. In some embodiments, the length of the protrusion of the handle body 121 from each handle rod (first handle rod 122 and second handle rod 123) may be adjustable. Each handle rod is pivotably connected to the seat tube 110 located on the same side of the carrier frame via a pivot shaft 630.

[0080] The armrest frame 130 includes, for example, a first armrest rod 132 and a second armrest rod 133 positioned on the left and right sides of the carrier frame, with the front ends of the first armrest rod 132 and the front ends of the second armrest rod 133 connected by an armrest body 131. The armrest body 131 may be attached to each armrest rod (the first armrest rod 132 and the second armrest rod 133) in a detachable or non-detachable manner.

[0081] The carrier frame 100 may include, for example, two auxiliary frames 140 and two connecting frames 150 on each of its left and right sides. Each auxiliary frame 140 is pivotably connected to an armrest rod located on the same side of the carrier frame, specifically via a pivot shaft 93. Each connecting frame 150 is pivotably connected to an auxiliary frame 140 on the same side of the carrier frame, specifically via a pivot shaft 630.

[0082] The front leg frame 160 of the carrier frame 100 includes, for example, a first front leg support rod 161 and a second front leg support rod 162 positioned on the left and right sides of the carrier frame, which are connected by a front cross rod (or footrest plate) 190. The rear leg frame 170 includes a first rear leg support rod 171 and a second rear leg support rod 172 positioned symmetrically, which are connected by a rear cross rod 173. A front wheel assembly 181 is attached to the lower end of each front leg support rod (first front leg support rod 161 and second front leg support rod 162). A rear wheel assembly 182 is attached to the lower end of each rear leg support rod (first rear leg support rod 171 and second rear leg support rod 172). The armrest rods, front leg support rods, and rear leg support rods on the same side of the carrier frame are pivotably connected via a pivot shaft 92. The front leg support rods and seat tube 110 on the same side of the carrier frame are pivotably connected via a pivot shaft 91. The connecting frame 150 and the rear leg support rod, located on the same side of the carrier frame, are pivotably connected via a pivot shaft 94. The connection relationships between the right-side components of the carrier in a first aspect of this disclosure will be described in detail below with reference to Figures 1 and 2. Since the carrier structure is substantially symmetrical, the connection relationships between the left-side components of the carrier can be understood by referring to the right-side connection relationships described below.

[0083] The front leg support rod and seat tube 110, located on the same side of the carrier frame, are pivotably connected via a pivot shaft 91. Specifically, a hole 1101 is provided at the front end of the right seat tube 110, and a hole 1601 is provided in the middle portion of the second front leg support rod 162. By inserting the pivot shaft 91 through holes 1101 and 1601, the seat tube 110 is pivotably connected to the second front leg support rod 162. A hole 1602 is provided at the upper end of the second front leg support rod 162, and a hole 1702 is provided at the upper end of the second rear leg support rod 172. Additionally, a hole 1301 is provided at the front end of the second armrest rod 133. By inserting the pivot shaft 92 through holes 1301, 1602, and 1702, the second armrest rod 133, the second front leg support rod 162, and the second rear leg support rod 172 are pivotably connected. A hole 1302 is provided at the rear end of the second armrest rod 133, and a hole 1402 is provided at the upper end of the auxiliary frame 140. By inserting the pivot shaft 93 through holes 1302 and 1402, the second armrest rod 133 is pivotably connected to the auxiliary frame 140. A hole 1102 is provided at the rear end of the seat tube 110, and a hole 1401 is provided at the lower end of the auxiliary frame 140. In addition, a hole 1502 is provided at the upper end of the connecting frame 150, and a hole 1201 is provided at the lower end of the second handle rod 123. By inserting the pivot shaft 630 through holes 1102, 1401, 1502, and 1201, the seat tube 110, auxiliary frame 140, connecting frame 150, and second handle rod 123 are pivotably connected. A hole 1501 is provided at the lower end of the connecting frame 150, and a hole 1701 is provided in the middle portion of the second rear leg support rod 172. By inserting the pivot shaft 94 through the holes 1501 and 1701, the connecting frame 150 is pivotably connected to the second rear leg support rod 172.

[0084] Referring to Figure 1, the carrier frame 100 is maintained in the deployed state by locking the relative rotation between the auxiliary frame 140 and the connecting frame 150. Conversely, when it is necessary to fold the carrier, the relative rotation lock between the auxiliary frame 140 and the connecting frame 150 is first released, and then the handle frame 120 is rotated to fold the entire carrier frame 100.

[0085] Referring to Figures 1 and 2, exemplary embodiments of a folding lock mechanism 700 used to lock the relative rotation of the auxiliary frame 140 and the connecting frame 150 are shown. Specifically, the auxiliary frame 140 is provided with a slide groove 1403 extending along the longitudinal direction of the auxiliary frame 140. A lock pin 730 is slidably positioned within the slide groove 1403 and adapted to move along the slide groove 1403 between holes 1401 and 1402. The connecting frame 150 is also provided with a lock groove 1503. When the carrier frame 100 switches from a folded state to an unfolded state, the auxiliary frame 140 and the connecting frame 150 rotate relative to each other about the pivot shaft 630. When the carrier is in the unfolded state, the lock groove 1503 aligns with the slide groove 1403, and the biasing force of the elastic return member inside the auxiliary frame 140 allows the lock pin 730 to be inserted into the lock groove 1503. In this configuration, the lock pin 730 is positioned in both the slide groove 1403 and the lock groove 1503, thereby locking the relative rotation between the auxiliary frame 140 and the connecting frame 150, and maintaining the carrier in the deployed state. In some embodiments, the lock pin 730 may include, for example, a locking portion 731 and a first contact portion 732. The locking portion 731 is used for sliding engagement with the slide groove 1403 and insertion into the lock groove 1503. The first contact portion 732 is provided, for example, projecting laterally from the locking portion 731.

[0086] Referring to Figures 1 and 2, exemplary embodiments of an operating mechanism used to unlock the relative rotation between the auxiliary frame 140 and the connecting frame 150 are also shown. Specifically, a first operating member 710, for example, a button, is provided on the handle body 121. Each handle rod (first handle rod 122 and second handle rod 123) is provided with a first slide block 740. Each first slide block 740 slides into the corresponding handle rod (first handle rod 122 or second handle rod 123). The first operating member 710 is connected to each first slide block 740 via a traction member (not shown), such as a rope within the handle frame 120. Each first slide block 740 is provided with a second contact portion 741 projecting laterally. When the carrier frame is deployed, the second contact portion 741 is located below the first contact portion 732 located on the same side of the carrier frame. When it is necessary to fold the carrier frame 100, the user presses down on the first operating member 710 to drive the first slide block 740 upward. After the second contact portion 741 contacts the first contact portion 732, the first slide block 740 drives the lock pin 730 out of the lock groove 1503, thereby releasing the lock on the relative rotation between the auxiliary frame 140 and the connecting frame 150. In some embodiments, elastic return members are provided inside each handle rod (first handle rod 122 and second handle rod 123). When the pressure on the first operating member 710 is released, the elastic return member pushes the corresponding first slide block 740 back to its initial position, and at the same time, the first operating member 710 also returns to its initial position.

[0087] Referring to Figures 1 and 2, exemplary embodiments of the positioning method for the handle frame 120 are also shown. Specifically, each handle rod (first handle rod 122 and second handle rod 123) is provided with a second slide block 920. The second slide block 920 is provided with a clamp groove 921. Each auxiliary frame 140 is provided with a first clamp block 930. In addition, each front leg support rod (first front leg support rod 161 and second front leg support rod 162) is provided with a second clamp block 940. As the handle frame 120 rotates in the front-rear direction around the pivot shaft 630, the clamp groove 921 selectively clamps either the first clamp block 930 of the auxiliary frame 140 or the second clamp block 940 of the front leg support rod, positioning the handle frame 120 in a first position tilted backward (as shown in Figure 1, when the first clamp block 930 of the auxiliary frame 140 is clamped in the clamp groove 921) or a second position tilted forward (not shown, when the second clamp block 940 of the front leg support rod is clamped in the clamp groove 921). Switching between the first position tilted backward and the second position tilted forward of the handle frame 120 is also referred to as switching between a rearward-facing posture and a forward-facing posture of the handle frame 120. When the handle frame 120 is in the first position, the child seated in the child carrier faces forward in the direction of travel and has their back to the caregiver pushing the handle frame 120. On the other hand, when the handle frame 120 is in the second position, the child seated in the child carrier faces backward in the direction of travel and towards the caregiver pushing the handle frame 120.

[0088] Each second slide block 920 slides into a corresponding handle rod 122 or 123. Inside each of the two handle rods 122 and 123, a second operating member 910 is provided. The second operating member 910 is connected to the second slide block 920 via a second pulling member (not shown), such as a rope inside the handle rod 122 or 123. When the second operating member 910 is operated, it drives the second slide block 920 to slide upward along the handle rod 122 or 123 via the second pulling member, thereby releasing the first clamp block 930 or the second clamp block 940 from the clamp groove 921 of the second slide block 920. In this state, the handle frame 120 can be rotated, and the handle frame 120 can be switched between a forward-facing and a rearward-facing position by clamping the second clamp block 940 or the first clamp block 930 into the clamp groove 921 of the second slide block 920. Furthermore, each handle rod 122, 123 may be provided with an elastic return member for pushing the corresponding second slide block 920 back to its initial position.

[0089] In another embodiment (not shown), a traction member connected between the first operating member 710 and the first slide block 740 is also connected to the second slide block 920. In this case, when it is necessary to change the orientation of the handle frame 120, the user presses down on the first operating member 710, causing the traction member to pull the second slide block 920 upward, releasing either the first clamp block 930 or the second clamp block 940 from the clamp groove 921 of the second slide block 920. In this state, the handle frame 120 can be rotated, and after the other of the first clamp block 930 or the second clamp block 940 aligns with the clamp groove 921 of the second slide block 920, it is clamped into the clamp groove 921 of the second slide block 920. Additionally, each handle rod may be provided with an elastic return member to push the corresponding second slide block 920 back to its initial position.

[0090] In embodiments where the first operating member 710 is connected to both the first slide block 740 and the second slide block 920, when the first operating member 710 is pressed, the first slide block 740 also moves upward, driving the lock pin 730 in the unlocking direction. To prevent the lock pin 730 from being accidentally unlocked when the position of the handle frame 120 is changed, in some embodiments, the distance the first slide block 740 moves to unlock the lock pin 730 is set to be greater than the distance the clamp groove 921 of the second slide block 920 moves to disengage from the clamp blocks 930 and 940. In addition, in some embodiments, a first indicator and a second indicator may be provided on the handle frame 120 in relation to the first operating member 710. When the first operating member 710 moves to the position of the first indicator, the clamp groove 921 of the second slide block 920 releases the first clamp block 930 or the second clamp block 940, at which point the handle frame 120 can be pushed to change its orientation, while the lock pin 730 still locks the relative rotation between the auxiliary frame 140 and the connecting frame 150. When the first operating member 710 moves to the position of the second indicator, the first slide block 740 drives the lock pin 730 to release the relative rotation between the auxiliary frame 140 and the connecting frame 150, thereby allowing the carrier frame 100 to be folded.

[0091] Referring to Figures 1 and 2, in some embodiments, the clamp blocks 930 and 940 may be provided with downwardly extending blocking plates 931 and 941, respectively. Each handle rod may be provided with a fixed fastening member 980 positioned below the corresponding second slide block 920 and facing the clamp groove 921. When the handle frame 120 is in the first position, the fastening member 980 abuts against the first blocking plate 931 on the corresponding auxiliary frame 140. When the handle frame 120 is in the second position, the fastening member 980 abuts against the second blocking plate 941 on the corresponding front leg support rod. The configuration of the blocking plates 931 and 941 and the fastening member 980 may limit the range of posture switching of the handle frame 120.

[0092] In some embodiments, referring again to Figures 1 and 2, the carrier frame 100 may further include a drive assembly 600. When the handle frame 120 rotates, it can drive the movable frame 220 to move along the seat tube 110 via the drive assembly 600. In some embodiments, as shown in Figure 1, when the carrier frame 100 is in the deployed state, when the handle frame 120 rotates about the pivot shaft 630 in a first direction S1 (e.g., clockwise as shown) to switch from a first position to a second position, the movable frame 220 slides forward relative to the seat tube 110. Conversely, when the handle frame 120 rotates about the pivot shaft 630 in a second direction S2 (e.g., counterclockwise as shown) to switch from a second position to a first position, the movable frame 220 slides backward relative to the seat tube 110. When the child's buttocks are supported by the seat frame 230, the forward and backward movement of the movable frame 220 during the process of changing the position of the handle frame 120 causes a forward and backward movement of the child carrier's center of gravity. As a result, the child carrier's center of gravity always moves closer to the caregiver pushing the handle frame 120, allowing the caregiver to push the child carrier with less force.

[0093] Referring to Figures 2 to 4, exemplary embodiments of the drive assembly 600 are shown. However, the embodiments of the drive assembly 600 are not limited to those provided herein. The drive assembly 600 includes a coupling mechanism 640 and the aforementioned pivot shaft 630. The pivot shaft 630 rotates in sync with the handle frame 120. The coupling mechanism 640 is connected between the pivot shaft 630 and the movable frame 220, converting the rotation of the pivot shaft 630 into the movement of the movable frame 220 along the seat tube 110.

[0094] Figures 3 and 4 also show an exemplary embodiment of the coupling mechanism 640. It should be understood that in some alternative embodiments, the implementation of the coupling mechanism 640 is not limited to the embodiments shown herein. The coupling mechanism 640 includes, for example, a first drive rod 610 and a second drive rod 620. The first end of the first drive rod 610 is provided with a hole 601, and the first drive rod 610 is sleeve-fitted onto the pivot shaft 630 through the hole 601 and rotates synchronously with the pivot shaft 630. The second end of the first drive rod 610 and the first end of the second drive rod 620 are connected via the pivot shaft 660. The second end of the second drive rod 620 is provided with a hole 603, which is pivotably connected to a hole 302 (Figure 2) in the movable frame 220 via a second rotating shaft N. As the handle frame 120 rotates to change its orientation, it drives the pivot shaft 630 to rotate synchronously, thereby synchronously rotating the first drive rod 610, and the second drive rod 620 drives the movable frame 220 to move in the front-rear direction along the seat tube 110.

[0095] Figures 3 and 4 also show an exemplary embodiment of the pivot shaft 630. It should be understood that in some alternative embodiments, the implementation of the pivot shaft 630 is not limited to the embodiments shown herein. The pivot shaft 630 includes, for example, a first shaft section 631, a second shaft section 632, and a third shaft section 633, which are sequentially connected. The first shaft section 631 is inserted into a hole 1102 in the seat tube 110 and is pivotably connected to the seat tube 110. The diameter of the second shaft section 632 is greater than the diameter of the first shaft section 631. Facet 6321 is provided on at least a portion of the length of the second shaft section 632. Facet 6011 is provided in the hole 601 of the first drive rod 610. The engagement of facet 6321 and facet 6011 ensures that the first drive rod 610 rotates synchronously with the pivot shaft 630. Facet 6331 is provided on at least a portion of the length of the third shaft section 633. Each handle rod (first handle rod 122 and second handle rod 123) has a hole 1201 with a facet 1205 (Figure 2). The engagement of facet 6331 and facet 1205 ensures that the handle frame 120 rotates in sync with the pivot shaft 630. It should be understood that there are many methods for achieving synchronous interlocking of the handle frame 120, pivot shaft 630, and first drive rod 610, and that this is not limited to the facet engagement described above.

[0096] The portion of the pivot shaft 630 located between facets 6321 and 6331 is used to pivot with hole 1401 in the auxiliary frame 140 and hole 1502 in the connecting frame 150. In some embodiments, the pivot shaft 630 may include a shaft shoulder 634, which has a larger diameter and is located between facets 6321 and 6331. For example, a shaft sleeve (not shown) can be sleeve-fitted onto the shaft shoulder 634, allowing holes 1401 and 1502 to pivot with the pivot shaft 630 via the shaft sleeve. The connecting frame 150 is located between the handle rod and the auxiliary frame 140 on the same side as the carrier frame in the axial direction of the pivot shaft 630.

[0097] In some embodiments, referring to Figures 1 to 3, the pivot shaft 630 is provided with a central hole 635, which is used for a fastening member 650 to pass through. The fastening member 650 may be a bolt or a rivet, which can easily secure the irregularly shaped pivot shaft 630 and multiple components that are sleeve-fitted to the pivot shaft 630.

[0098] Referring again to Figures 1 and 2, an exemplary embodiment of the backrest assembly 400 is also shown. In some alternative embodiments, the backrest assembly 400 may have other implementations. In this embodiment, the backrest assembly 400 includes, for example, a backrest frame 410, a backrest tube 450, an adjustable harness 430, and a harness adjustment mechanism 440. The backrest frame 410 and the backrest tube 450 are pivotably mounted on a first rotation shaft M provided on the movable frame 220. The backrest frame 410 and the backrest tube 450 can each rotate about the first rotation shaft M. The harness adjustment mechanism 440 and the adjustable harness 430 are connected to the backrest frame 410.

[0099] The backrest frame 410 is, for example, U-shaped. The backrest frame 410 includes left and right first backrest rods 412 and second backrest rods 413, and a backrest body 411 connected between the upper ends of the first backrest rods 412 and second backrest rods 413. Each of the two backrest rods is pivotally connected via a first rotating shaft M to a hole 301 in the movable frame 220 on the same side of the carrier frame. Thus, when the carrier frame 100 is deployed and the movable frame 220 moves in the longitudinal direction relative to the seat tube 110, the backrest frame 410 moves synchronously with the movable frame 220 while maintaining its relative position to the movable frame 220 in the longitudinal direction.

[0100] The backrest tube 450 is, for example, U-shaped, with each of its left and right vertical columns pivotably connected to the backrest frame 410 via a first rotation shaft M. The backrest frame 410 and the backrest tube 450 may be surrounded by a seat fabric (not shown). The seat fabric in the area defined by the backrest tube 450 may form a backrest section that supports the child's back. In some alternative embodiments, a rigid backrest plate (not shown) may be placed inside the backrest section. An adjustable harness 430 is connected to each backrest rod (first backrest rod 412 and second backrest rod 413), passes over the backrest tube 450, and connects to a harness adjustment mechanism located behind the backrest plate. The inclination angle of the backrest tube 450 and the backrest plate can be adjusted by increasing or decreasing the length of the adjustable harness 430 between each backrest rod and the harness adjustment mechanism. For details on the implementation of the harness adjustment mechanism, please refer to related technologies, and a detailed explanation is omitted here. In some alternative embodiments, the backrest assembly 400 may not include the backrest tube 450, and the backrest plate is connected to the backrest frame 410 only via the seat fabric, while the tilt angle of the backrest plate can still be adjusted by the harness adjustment mechanism 440 and the adjustable harness 430.

[0101] In some embodiments, the child carrier may further include connecting members (not shown) for limiting the range of rotation of the backrest frame 410 and preventing over-rotation in a second direction S2 or a first direction S1 around the first rotation shaft M. In some embodiments, the connecting members may include, for example, a flexible belt connected between the armrest rod (first armrest rod 132 or second armrest rod 133) and the backrest rod (first backrest rod 412 or second backrest rod 413) on the same side of the carrier frame. It should be understood that the implementation of the connecting members is not limited to these.

[0102] During the folding process of the carrier frame, the backrest frame 410 is subjected to a pressing force and tends to swing toward the movable frame 220. Referring to Figures 1, 2, and 5, the child carrier may further include a restraining block 1600, and one exemplary embodiment of the restraining block 1600 is also shown. In some alternative embodiments, the restraining block 1600 may have other implementations. The restraining block 1600 can be mounted at any suitable position on the carrier frame 100 to restrict the rotation of the backrest frame 410 as needed.

[0103] In this embodiment, the limiting block 1600 includes, for example, a limiting body 1610. The limiting body 1610 is provided with, for example, a mounting groove 1611, and the limiting block 1600 is fixed to the rear end of the seat tube 110 via the mounting groove 1611. As shown in Figures 2 and 5, the seat tube 110 is a flat tube, and the mounting groove 1611 is also a corresponding flat groove, so when the two are attached, no circumferential rotation occurs between the limiting block 1600 and the seat tube 110. Furthermore, the limiting body 1610 of the limiting block 1600 may be provided with a hole 1612 through which a pivot shaft 630 passes, and the relative movement between the limiting block 1600 and the seat tube 110 is restricted by the pivot shaft 630, and the limiting block 1600 is fixed to the seat tube 110. The structure of the limiting block 1600 and the seat tube 110 is not limited to the examples of this embodiment, and accordingly, the method of limiting the circumferential rotation and axial movement of the limiting block 1600 and the seat tube 110 is also not limited to the examples of this embodiment. For example, in some alternative embodiments, the mounting groove 1611 of the limiting block 1600 may be connected to the seat tube 110 by facet engagement, or the hole 1612 of the limiting block 1600 may be connected to the seat tube 110 by another pivot shaft parallel to the pivot shaft 630.

[0104] Referring again to Figure 1, each backrest rod (first backrest rod 412 and second backrest rod 413) has a movable end 414. The movable end 414 is located, for example, below the corresponding backrest rod and positioned below the first rotating shaft M. When the carrier frame 100 is in the deployed state and the handle frame 120 is in a first position tilted backward, the movable end 414 is sandwiched, for example, between the limiting block 1600 and the movable frame 220 to achieve the positioning of the backrest frame 410. More specifically, the limiting block 1600 may have a first end face 1613 and the movable frame 220 may have an engaging portion 226, and the first end face 1613 and the engaging portion 226 sandwich the movable end 414 from both sides to position the backrest frame 410. The first end face 1613 and the engaging portion 226 may each have a surface shape that conforms to the movable end 414. In some embodiments, the movable end 414 extends inclined at the bottom of the backrest rod, and the first end face 1613 and the engaging portion 226 extend inclined accordingly. In some embodiments, when the carrier frame 100 is in the deployed state and the handle frame 120 is in a second position inclined forward, the movable frame 220 is pushed forward of the seat tube 110, and moves away from the first end face 1613 of the limiting block 1600 while maintaining contact between the movable end 414 and the engaging portion 226 of the movable frame 220. In this case, the engaging portion 226 of the movable frame 220 restricts the rotation of the backrest frame 410 in the second direction S2, and at the same time, the backrest frame 410 is pulled by the aforementioned connecting member (not shown) and its rotation in the first direction S1 is restricted, so the backrest frame 410 is positioned by the combination of the engaging portion 226 and the connecting member.

[0105] Figure 6 shows a perspective view of the child carrier in a state between the unfolded and folded state. Figure 7 shows a cross-sectional view of the child carrier in a further state between the unfolded and folded state. Figure 8 shows a perspective view of the child carrier in the folded state. The folding process of the child carrier will be described below with reference to Figures 1, 2 and 6-8.

[0106] Referring to Figures 1 and 2, when the child carrier needs to be folded, the user presses the operating member 710 to release the lock on the relative rotation between the auxiliary frame 140 and the connecting frame 150, then presses the handle frame 120 to drive the auxiliary frame 140 to rotate in a first direction S1 around the pivot shaft 630, and the connecting frame 150 to rotate in a second direction S2 around the pivot shaft 94. The rotation of the connecting frame 150 drives the seat tube 110 to rotate in a second direction S2 around the pivot shaft 91, and drives the armrest rod to rotate in a second direction S2 around the pivot shaft 92, resulting in the front leg frame 160 and the rear leg frame 170 moving closer to each other, and finally the carrier frame is folded as shown in Figure 8.

[0107] Referring to Figures 6 and 7, during the folding process of the child carrier, as the handle frame 120 rotates, the movable frame 220 moves along the seat tube 110 away from the limiting block 1600, thereby separating the engaging portion 226 from the movable end 414 and securing space for the backrest frame 410 to rotate. The handle frame 120, rotating in the first direction S1, rotates the backrest frame 410 in the first direction S1 around the first rotation shaft M, bringing it closer to the movable frame 220.

[0108] When the carrier frame 100 switches from an unfolded state to a folded state, the backrest frame 410 continues to receive pressure from the handle frame 120, making it prone to unstable swinging in the first direction S1, and making it difficult to stably fold the backrest frame 410 together with the handle frame 120. In view of this, the limiting block 1600 of this embodiment is provided with an extendable portion 1620, which, when the carrier frame 100 switches from an unfolded state to a folded state, contacts the movable end 414 of the backrest rod on the same side of the carrier frame, applying a force in the second direction S2 to the backrest frame 410 to resist the pressure in the first direction S1, enabling the backrest frame 410 to be stably folded together with the handle frame 120, and reducing the swinging phenomenon of the backrest frame 410 during the folding process of the carrier frame 100.

[0109] Referring to Figures 5 to 7, in some embodiments, the telescopic section 1620 is positioned below the first end face 1613. As the backrest frame 410 rotates in the first direction S1 about the first rotation shaft M, the movable end 414 reaches the extension / retraction path of the telescopic section 1620, causing the telescopic section 1620 to contact the movable end 414 and apply force to the backrest frame 410. In some alternative embodiments, the extension / retraction path of the telescopic section 1620 may pass through at least a portion of the area of ​​the first end face 1613.

[0110] Figures 5, 7, and 8 show an exemplary embodiment of the expandable section 1620. The implementation of the expandable section 1620 may take other forms, and is not limited to this embodiment. The expandable section 1620 may include a slide block 1621 and an elastic return member 1622. The slide block 1621 slides into the limiting body 1610 and is used to contact the movable end 414. In some embodiments, the slide block 1621 may be formed of a material with excellent strength and wear resistance, for example. The elastic return member 1622 is sandwiched between the limiting body 1610 and the slide block 1621, allowing the slide block 1621 to elastically expand and contract when it contacts the movable end 414. The elastic return member 1622 may be, for example, a spring. In some alternative embodiments, the telescopic portion 1620 may have, for example, an elastic return structure or be directly formed from an elastically deformable material, be attached to the limiting body 1610, elastically deform to contact the movable end 414, and apply a rotational force in the second direction S2 to the backrest frame 410.

[0111] Referring to Figure 5, in some embodiments, the limiting body 1610 is provided with a guide groove 1614. The guide groove 1614 has, for example, a groove opening 1615 facing the movable end 414 and a groove bottom facing the groove opening 1615. The groove bottom may have a closed structure. The telescopic portion 1620 is mounted in the guide groove 1614 via the groove opening 1615 and can elastically expand and contract relative to the groove opening 1615. More specifically, the slide block 1621 slides into the guide groove 1614. An elastic return member 1622 is sandwiched between the groove bottom of the guide groove 1614 and the slide block 1621. The elastic return member 1622 allows the slide block 1621 to elastically expand and contract relative to the groove opening 1615. The slide block 1621 located outside the groove opening 1615 is used to contact the movable end 414. In some alternative embodiments, the telescopic portion 1620 is not limited to being attached to the limiting body 1610 via the guide groove 1614, but may be connected to the limiting body 1610 by other suitable structures.

[0112] Referring to Figure 5, in some embodiments, a limiting mechanism 1630 may be provided between the slide block 1621 and the limiting body 1610 to limit the sliding stroke of the slide block 1621 and prevent the telescopic portion 1620 from accidentally falling out of the guide groove 1614. The limiting mechanism 1630 includes, for example, a limiting hole 1631 provided in the groove wall of the guide groove 1614 and a limiting projection 1632 provided on the slide block 1621. The limiting projection 1632 slides into the limiting hole 1631. In some embodiments, the limiting hole 1631 may be, for example, an elongated hole, and the limiting projection 1632 may be, for example, a pin provided on the slide block 1621. In some alternative embodiments, the positions of the limiting hole 1631 and the limiting projection 1632 may be swapped between the wall of the guide groove 1614 and the slide block 1621.

[0113] Referring to Figure 5, in some embodiments, an outwardly extending extension support portion 1616 is provided below the groove opening 1615 of the guide groove 1614. The extension support portion 1616 provides additional support to the slide block 1621 that extends and retracts relative to the groove opening 1615. In some embodiments, a limiting projection 1617 may be provided above the groove opening 1614, and the limiting projection 1617 is positioned opposite the extension support portion 1616. The limiting projection 1617 can restrict the movable end 414 from excessively pivoting in the first direction S1 around the first rotation shaft M. In some embodiments, the limiting projection 1617 may be provided, for example, above the groove opening 1615 of the guide groove 1614, for example, at the intersection of the end face 1618 and the first end face 1613 of the groove opening 1615.

[0114] Second aspect

[0115] To facilitate storage and transport, many strollers on the market are foldable, with the folding of the carrier frame, for example, being linked to the folding of the seat assembly. These types of strollers generally feature a backrest frame and backrest plate on the seat assembly, and the angle of the backrest frame is adjusted by adjusting the length of the harness. However, the backrest frame needs to be fixed, its position restricted, and folded, and furthermore, the folding and unfolding of the backrest frame needs to be linked to the folding and unfolding of the carrier frame, resulting in a complex operating mechanism and making it inconvenient to use.

[0116] As shown in Figure 9, a second aspect of the present disclosure provides a carrier which may be a stroller. The stroller has a structure which links the folding of the carrier frame 100 with the folding of the backrest assembly 400, and is simple in structure and easy to use.

[0117] Specifically, as shown in Figures 9 and 10, the stroller includes a carrier frame 100, a seat assembly 200, a backrest assembly 400, a drive assembly 600, a folding lock mechanism 700, and a connecting rod assembly 1500. The carrier frame 100 is switchable between a folded state and an unfolded state. The seat assembly 200 is movably positioned on the carrier frame 100. The connecting rod assembly 1500 is movably connected to the carrier frame 100 and the seat assembly 200. The backrest assembly 300 is movably connected to the seat assembly 200 via the connecting rod assembly 1500. When the carrier frame 100 switches from the unfolded state to the folded state, the carrier frame 100 can be driven via the connecting rod assembly 1500 to fold the backrest assembly 300 toward the seat assembly 200. The drive assembly 600 is positioned between the handle frame 120 and the movable frame 220 of the seat assembly 200 (as described later). The carrier frame 100 can be operated via a drive assembly 300 to drive the movable frame 220 to move along the seat tube 110 (described later) of the carrier frame 100.

[0118] Specifically, as shown in Figures 9 and 10, the carrier frame 100 includes a seat tube 110, a handle frame 120, an armrest frame 130, an auxiliary frame 140, a connecting frame 150, a front leg frame 160, and a rear leg frame 170. The armrest frame 130 includes an armrest body 131 and two armrest rods 132 and 133. Both the front leg frame 160 and the rear leg frame 170 have a substantially H-shaped structure. The two upper ends of the front leg frame 160 are pivotably connected to the two upper ends of the rear leg frame 170, respectively. The two lower ends of the front leg frame 160 are positioned away from the two lower ends of the rear leg frame 170, respectively, forming two stable triangular support structures. Wheel assemblies 181 and 182 are provided at the two lower ends of the front leg frame 160 and the two lower ends of the rear leg frame 170, respectively. The armrest body 131 is a roughly U-shaped rod structure, and both ends are detachably or non-detachably connected to two pivot points on the front leg frame 160 and the rear leg frame 170, respectively. There are two armrest rods, namely the first armrest rod 132 and the second armrest rod 133, both of which extend substantially in the front-to-rear direction of the stroller. The front ends of the two armrest rods 132 and 133 are pivotally connected to the pivot points on the front leg frame 160 and the rear leg frame 170, respectively. Correspondingly, two auxiliary frames 140 are provided. The upper ends of the two auxiliary frames 140 are pivotably connected to the rear ends of the two armrest rods 132 and 133, respectively. Correspondingly, two connecting frames 150 are provided, both of which have a roughly L-shaped structure. One end of each of the two connecting frames 150 is pivotably connected to the lower end of each of the two auxiliary frames 140, and the other end of each of the two connecting frames 150 is pivotably connected to either the left or right side of the rear leg frame 170. Specifically, the handle frame 120 includes a handle body 121 with a roughly U-shaped structure and two handle rods 122 and 123 connected to both ends of the handle frame 120. The lower ends of the two handle rods 122 and 123 are pivotably connected to the seat tube 110.

[0119] Specifically, as shown in Figures 9 and 10, two seat tubes 110 are positioned on the left and right sides of the stroller, respectively. The seat assembly 200 includes two movable frames 220 that are slidably mounted on the two seat tubes 110, and a seat frame 230 fixed to the two movable frames 220. Below, an example of the structure of one of the seat tubes 110 and movable frame 220 on each side will be described.

[0120] As shown in Figures 11 to 13, the seat tube 110 extends substantially in the front-to-rear direction of the stroller. The front and rear ends of the seat tube 110 are pivotally connected to the front leg frame 160 and the rear leg frame 170, respectively. The movable frame 220 includes a slide sleeve 221, a connecting portion 222, a first mounting portion 223, and a second mounting portion 224.

[0121] The slide sleeve 221 is sleeve-fitted to the outside of the seat tube 110 and can move along the seat tube 110. The connector 222 is attached to the underside of the slide sleeve 221. The connector 222 is provided with a groove opening 2221. One or both of the opposing side walls of the groove opening 2221 are provided with guide grooves 2222 that pass through each of them. The connector 222 has a substantially L-shaped structure and includes a first connector section 2223 and a second connector section 2224 that are connected to each other. The first connector section 2223 extends in a direction parallel to the seat tube 110 and is connected to the slide sleeve 221 on one side. One end of the second connector section 2224 is connected to one end of the first connector section 2223. The direction of extension of the second connector section 2224 intersects the direction of extension of the first connector section 2223. The second connection section 2224 is positioned at an angle to the slide sleeve 221, thereby forming a recess 225 between the second connection section 2224 and the slide sleeve 221 (see Figure 13). The wall of the recess 225 forms an engagement portion 226. The guide groove 2222 includes a first groove portion 2222a and a second groove portion 2222b that communicate with each other. The first groove portion 2222a extends in the direction of movement of the movable frame 220. The direction of extension of the second groove portion 2222b intersects with the direction of extension of the first groove portion 2222a. The end of the first groove portion 2222a away from the second groove portion 2222b is the first end 2222c, and the end of the second groove portion 2222b away from the first groove portion 2222a is the second end 2222d. In this embodiment, the guide groove 2222 is provided substantially along the direction of extension of the connection portion 222. In other embodiments, the connecting portion 222 may have a different shape, and the guide groove 2222 does not need to be provided in the extending direction of the connecting portion 222. The first mounting portion 223 is attached to the inside of the slide sleeve 221, that is, on the opposite side facing the seat tube 110. The side of the seat frame 230 is attached to the first mounting portion 223. The second mounting portion 224 is located on the rear upper side of the slide sleeve 221. In this embodiment, the movable frame 220 is a single integrated structure.

[0122] Specifically, as shown in Figures 12 and 13, the drive assembly 600 includes a first drive rod 610 and a second drive rod 620 that are pivotally connected to each other. The end of the first drive rod 610 away from the second drive rod 620 is connected to the handle frame 120. The end of the second drive rod 620 away from the first drive rod 610 is also connected to the handle frame 120. In this embodiment, the end of the second drive rod 620 away from the first drive rod 610 is connected to a second mounting portion 224 of the movable frame 220. This allows the handle frame 120 to rotate so as to drive the movable frame 220 to slide along the seat tube 110 during the folding or unfolding process of the carrier frame 100. In this embodiment, the drive assembly 600 further includes a pivot shaft 630. One end of the pivot shaft 630 is fixed to the lower end of the handle rod 122 or 123, and the other end of the pivot shaft 630 passes through the connecting frame 150, the auxiliary frame 140, and the end of the first drive rod 610 away from the second drive rod 620, before being pivotally connected to the rear end of the seat tube 110. The end of the first drive rod 610 away from the second drive rod 620 is fixedly connected to the pivot shaft 630. In this way, when the handle rods 122 and 123 are rotated, they can be driven to pivot the first drive rod 610 and the second drive rod 620 via the pivot shaft 630, and the second drive rod 620 can push the movable frame 220 to slide along the seat tube 110.

[0123] Furthermore, as shown in Figures 12 and 13, the stroller may also include a folding lock mechanism 700. Specifically, the folding lock mechanism 700 includes a first operating member 710, a first traction member (not shown), a lock pin 730, and a first slide block 740. In this embodiment, there is one first operating member 710, which is operably positioned approximately in the center of the handle body 121, but is not limited to this. There are two first traction members, two lock pins 730, and two first slide blocks 740, which are positioned on the left and right sides of the stroller, respectively. Below, an example of the folding lock mechanism 700 on one of the sides will be described.

[0124] As shown in Figures 12 and 13, the first slide block 740 is slidably positioned on the handle rod 122 or 123. One end of the first traction member is connected to the first operating member 710, and the other end of the first traction member is connected to the first slide block 740. The first operating member 710 can be operated to drive the first slide block 740 to slide upward along the handle rod 122 or 123 via the first traction member. A first lock groove 1503a is formed at the connection between the connecting frame 150 and the auxiliary frame 140. A slide groove 1403 is formed on the side of the auxiliary frame 140 facing the handle rod 122 or 123, i.e., on the outside of the auxiliary frame 140. A lock pin 730 is slidably positioned within the slide groove 1403. When the stroller is switched to the unfolded state, the lock pin 730 can be switched between an unfolded and locked position and an unfolded and unlocked position. Specifically, when the stroller is switched to the unfolded state, the first lock groove 1503a aligns with the slide groove 1403, allowing the lock pin 730 to be inserted into the first lock groove 1503a (i.e., the unfolded and locked position), and the carrier frame 100 can be locked in the unfolded state. The lock pin 730 can be pulled out of the first lock groove 1503a (i.e., the unfolded and unlocked position), unlocking the carrier frame 100 in the unfolded state, and the carrier frame 100 can be folded. The lock pin 730 includes a lock portion 731 and a first pressing portion 732 that are connected to each other. The lock portion 731 is slidably positioned within the slide groove 1403 and can be inserted into the first lock groove 1503a. One end of the first pressing portion 732 is fixed to the lock portion 731, and the other end of the first pressing portion 732 protrudes toward the handle rod 122 or 123. The first slide block 740 is provided with a second pressing portion 741 that protrudes toward the auxiliary frame 140. The second pressing portion 741 can engage with the lower side of the first pressing portion 732.In this way, when the first operating member 710 is operated, the first operating member 710 pulls the first slide block 740 upward via the first pulling member, and the engagement of the second pressing part 741 and the first pressing part 732 drives the first slide block 740 to move the lock pin 730 upward, and the locking part 731 of the lock pin 730 moves to the deployed and unlocked position, which is pulled out of the first lock groove 1503a, thereby releasing the lock on the deployed state of the carrier frame 100.

[0125] As shown in Figures 13, 17a, and 17b, a second lock groove 1503b may also be formed at the connection between the connecting frame 150 and the auxiliary frame 140. When the stroller is switched to the folded state, the lock pin 730 is switchable between a folded and locked position and a folded and unlocked position. Specifically, when the stroller is switched to the folded state, the second lock groove 1503b aligns with the slide groove 1403, allowing the lock pin 730 to be inserted into the second lock groove 1503b (i.e., the folded and locked position), and the carrier frame 100 can be locked in the folded state. The lock pin 730 can be pulled out of the second lock groove 1503b (i.e., the folded and unlocked position), and the lock on the folded state of the carrier frame 100 can be released and it can be unfolded. When the first operating member 710 is operated, the first operating member 710 pulls the first slide block 740 upward via the first pulling member, and the engagement between the second pressing part 741 and the first pressing part 732 drives the first slide block 740 to move the lock pin 730 upward, moving the locking part 731 of the lock pin 730 to the folded and unlocked position where it disengages from the second lock groove 1503b, thereby releasing the lock on the folded state of the carrier frame 100.

[0126] The first lock groove 1503a and the second lock groove 1503b may be provided on both sides of the pivot shaft 630 that pivotally connects the connecting frame 150 and the auxiliary frame 140. As a result, when the carrier frame 100 is in the deployed state, the first lock groove 1503a aligns with the slide groove 1403, and when the carrier frame 100 switches from the deployed state to the folded state, the connecting frame 150 rotates relative to the auxiliary frame 140 around the pivot shaft 630, and when the carrier frame 100 is in the folded state, the second lock groove 1503b aligns with the slide groove 1403.

[0127] Furthermore, the stroller may include a posture switching lock mechanism 900. Specifically, the posture switching lock mechanism 900 includes a second operating member 910, a second traction member (not shown), and a second slide block 920. As shown in Figure 10, there are two second operating members 910, each operably positioned inside two handle rods 122 and 123. Referring together to Figures 12 and 13, there are two second traction members and two second slide blocks 920, each positioned on the left and right sides of the stroller. Below, an example of the posture switching lock mechanism 900 on one of the sides will be described.

[0128] As shown in Figures 12 and 13, the second slide block 920 is slidably positioned on the handle rod 122 or 123. The second slide block 920 is positioned above the first slide block 740, that is, on the side of the first slide block 740 closer to the handle body 121. One end of the second traction member is connected to the second operating member 910, and the other end of the second traction member is connected to the second slide block 920. A first clamp block 930 is provided at the upper end of the auxiliary frame 140, and referring to Figure 9, a second clamp block is provided at the upper end of the front leg frame 160, and the second slide block 920 is provided with a clamp groove 921 capable of clamping the first clamp block 930 or the second clamp block 940. Referring also to Figure 10, as described above, the second operating member 910 can be operated to drive the second slide block 920 upward along the handle rod 122 or 123 via the second traction member, during which the first clamp block 930 moves away from the clamp groove 921 of the second slide block 920, the handle frame 120 becomes rotatable, and the second clamp block 940 can be clamped into the clamp groove 921 of the second slide block 920. This makes it possible to switch the handle frame 120 between forward and rearward orientations. That is, before the orientation change, the front leg frame 160 is positioned in front of the rear leg frame 170, and after the orientation change, the front leg frame 160 is positioned behind the rear leg frame 170. In this specification, "forward" and "rearward" are relative to the direction of travel of the stroller. Specifically, the direction of travel in which the front leg frame 160 is positioned in front of the rear leg frame 170 of the stroller can be called the first direction of travel F1 (see Figure 15), and the direction of travel in which the front leg frame 160 is positioned behind the rear leg frame 170 of the stroller can be called the second direction of travel F2 (see Figure 16).

[0129] Specifically, as shown in Figures 13 and 14, connecting rod assemblies 1500 are provided on both the left and right sides of the stroller. Below, the specific structure of one of the connecting rod assemblies 1500 will be described as an example.

[0130] The connecting rod assembly 1500 includes a first connecting rod 1510 and a second connecting rod 1520. The first connecting rod 1510 has a substantially elongated shape. The first connecting rod 1510 has a first movable portion 1511 and a first pivot portion 1512. In this embodiment, the first movable portion 1511 and the first pivot portion 1512 are located at both ends of the first connecting rod 1510, respectively. The first movable portion 1511 is movably and pivotably connected to the seat assembly 200, and the first pivot portion 1512 is pivotally connected to the carrier frame 100. In this embodiment, the first movable portion 1511 is provided with a first movable projection 15111. The end of the first connecting rod 1510, which has the first movable portion 1511, is inserted into the connecting portion 222 through the groove opening 2221, and the first movable projection 15111 is inserted into the guide groove 2222 of the connecting portion 222 and can slide along the guide groove 2222. This makes the first movable portion 1511 slidable relative to the connecting portion 222. In this way, the first connecting rod 1510 is movably fitted into the groove opening 2221, guided and positioned by the first movable projection 15111 and the guide groove 2222, improving the stability of the movement of the first connecting rod 1510. When the stroller is unfolded, the first movable projection 15111 is located at the first end 2222c of the guide groove 2222. When the stroller is folded, the first movable projection 15111 is located at the second end 2222d of the guide groove 2222. The first pivot portion 1512 is pivotably connected to the lower end of the auxiliary frame 140 via a pivot shaft 97. In this embodiment, the aforementioned seat tube 110 is pivotably connected to the auxiliary frame 140 via a pivot shaft 630, and the pivot shaft 630 is positioned spaced apart from the lower end of the auxiliary frame 140 relative to the pivot shaft 97, i.e., the pivot shaft 630 is located above the pivot shaft 97. The first connecting rod 1510 is provided with a drive groove 1513 located between the first movable portion 1511 and the first pivot portion 1512, and extending along the longitudinal direction of the first connecting rod 1510.

[0131] Furthermore, as shown in Figures 13 and 14, the second connecting rod 1520 includes a first rod portion 1521 and a second rod portion 1522 connected to each other. The first rod portion 1521 and the second rod portion 1522 are connected at an angle to each other, not at a right angle, so the second connecting rod 1520 has a substantially L-shaped structure. A second movable portion 1523 is provided at the end of the first rod portion 1521 away from the second rod portion 1522. A second pivot portion 1524 is provided on the second rod portion 1522. The second movable portion 1523 is movably and pivotably connected to the first connecting rod 1510. The second pivot portion 1524 is pivotably connected to the backrest assembly 400. In this embodiment, the second movable portion 1523 is provided with a second movable projection 15231, which is inserted into a drive groove 1513 of the first connecting rod 1510 and is slidable along the drive groove 1513. The connection between the second rod portion 1522 and the first rod portion 1521 is pivotally connected to the backrest tube 450 (described later) of the backrest assembly 400 via a first connecting shaft 95. Furthermore, when the stroller is in the unfolded state, the second movable projection 15231 engages with the engagement portion 226 of the movable frame 220, allowing the stroller to be held in the unfolded state more effectively. As shown in Figure 9, when the stroller is in the folded state, the second movable projection 15231 is separated from the engagement portion 226 of the movable frame 220. In other embodiments, the first rod portion 1521 or the second rod portion 1522 may be pivotably connected to the backrest tube 450 of the backrest assembly 400 via the first connecting shaft 95, and the second pivot portion 1524 may be pivotably connected to the first backrest frame 610 (described later) of the backrest assembly 400 via the second connecting shaft 96.

[0132] Specifically, as shown in Figures 12 to 14, the backrest assembly 400 includes a first backrest frame 410, a second backrest frame 420, a backrest tube 450, a connecting harness 430, and a harness adjuster 440.

[0133] As shown in Figures 12 to 14, the first backrest frame 410 includes two roughly elongated backrest rods 412 and 413 positioned on the left and right sides of the stroller. The lower ends of the two backrest rods 412 and 413 are pivotally connected to the second pivot portions 1524 of two second connecting rods 1520 via second connecting shafts 96. The second backrest frame 420 is roughly U-shaped and includes a backrest horizontal frame 421 and two backrest vertical frames 422 connected to both ends of the backrest horizontal frame 421. The upper ends of the two backrest rods 412 and 413 are pivotally connected to both ends of the backrest horizontal frame 421. The ends of the two backrest rods 412 and 413 furthest from the backrest horizontal frame 421 are pivotally connected to backrest tubes 450. The backrest tube 450 is roughly U-shaped. As described above, the two lower ends of the backrest tube 450 are pivotably connected to two second connecting rods 1520 via the first connecting shaft 95. Furthermore, the backrest assembly 400 may include two curved limiting plates 460. Each limiting plate 460 is pivotably connected between one of the lower ends of the backrest tube 450 and one of the second connecting rods 1520. By providing the limiting plates 460 between the backrest tube 450 and the second connecting rods 1520, the oscillation of the backrest tube 450 during rotation can be reduced. A backrest plate (not shown) may be fixed to the backrest tube 450. A cover such as a tarp may be placed over the outside of the first backrest frame 410, the second backrest frame 420, and the backrest tube 450 to create a space for infants to lean against or lie down.

[0134] Furthermore, as shown in Figure 12, one end of the connecting harness 430 is connected to the second connecting rod 1520 of the connecting rod assembly 1500 located on one side of the stroller, and the other end of the connecting harness 430 passes through the backrest tube 450 on the opposite side from the seat assembly 200 and connects to the second connecting rod 1520 of the connecting rod assembly 1500 on the opposite side of the stroller. A harness adjuster 440 is positioned on the connecting harness 430 to adjust its length. In this embodiment, as shown in Figure 14, both ends of the connecting harness 430 are connected to the ends of the second connecting rod 1520 located on the same side of the stroller, away from the first connecting rod 1510. The connection point between the connecting harness 430 and the second connecting rod 1520 is located on the side of the second connecting shaft 96 farther from the first connecting rod 1510, i.e., the upper side of the second connecting shaft 96, i.e., the upper end of the second rod portion 1522.

[0135] Furthermore, the length of the connecting harness 430 is adjustable between a first length and a second length by the harness adjuster 440. The first length is the minimum length of the connecting harness 430, and the second length is the maximum length. When the connecting harness 430 is at the first length, as shown in Figure 14, the backrest tube 450 is at a first tilt angle relative to the seat assembly 200, the backrest tube 450 is coplanar with the second backrest frame 420, and the stroller is in seat mode. When the connecting harness 430 is at the second length, as shown in Figure 15, the backrest tube 450 is at a second tilt angle relative to the seat assembly 200, and the stroller is in recliner mode. At this time, as can be seen from the side cross-sectional view of the stroller shown in Figure 15, the backrest tube 450, the second backrest frame 420, the first backrest frame 410, and the second rod portion 1522 of the second connecting rod 1520 are connected to each other, forming a roughly rectangular frame structure as a whole, and the back and head of an infant can lie in the space enclosed by the backrest tube 450, the second backrest frame 420, the first backrest frame 410, the second rod portion 1522 of the second connecting rod 1520, and the tarp. Note that the second inclination angle is greater than the first inclination angle.

[0136] Figure 16 shows a schematic diagram of the stroller structure with the connecting harness 430 at its second length and the handle frame 120 reversed. Referring also to Figure 15, when the handle frame 120 is operated to switch the direction of travel of the stroller from the first direction to the second direction, the handle rods 122 and 123 drive the first drive rod 610 and the second drive rod 620 pivotally via the pivot shaft 630, and the second drive rod 620 drives the movable frame 220 and the seat frame 230 to move along the seat tube 110 in a third direction D3, that is, as shown in Figure 16, drives the movable frame 220 and the seat frame 230 to move backward (third direction D3). As a result, the infant or toddler seated on the seat frame 230 also moves backward (third direction D3), reducing the burden on the caregiver when pushing the stroller. Furthermore, as shown in Figures 15 and 16, when the direction of travel of the stroller switches from the first direction of travel to the second direction of travel, the first connecting rod 1510 moves in the second direction of travel, the first moving portion 1511 is located near the connecting joint between the first groove portion 2222a and the second groove portion 2222b, and the first connecting rod 1510 extends to the outside of the connecting portion 222 through the groove opening 2221.

[0137] Furthermore, as shown in Figures 14 to 16, regardless of the length of the connecting harness 430 or whether the stroller is moving in the first or second direction, as long as the stroller is unfolded, the second movable projection 15231 can engage with the engaging end 226 of the movable frame 220, thereby restricting the position of the second connecting rod 1520 and fixing the backrest tube 450 at a predetermined inclination angle.

[0138] The folding process for the right side of the stroller will be explained in detail below, using that as an example. Note that the folding process for the left side of the stroller is essentially the same as that for the right side.

[0139] When the stroller needs to be folded, as shown in Figures 9 and 10, the first operating member 710 on the handle frame 120 can be operated so that the first operating member 710 drives the first slide block 740 via the first traction member to slide in a direction closer to the handle body 121, i.e., in the first direction D1. At the same time, as shown in Figures 12 and 13, the first slide block 740 presses the first pressing portion 732 of the lock pin 730 via the second pressing portion 741, causing the lock pin 730 to also slide in the first direction D1 and disengage from the first lock groove 1503a, thereby releasing the lock of the folding lock mechanism 700. Subsequently, by pushing down the handle frame 120, the handle frame 120 and the auxiliary frame 140 rotate in a direction closer to the seat tube 110, i.e., in the second direction D2 in Figure 12, and fold. During the folding process by rotation, the auxiliary frame 140, through the connecting function of the first drive rod 610 and the second drive rod 620, drives the movable frame 220 to slide toward the front end of the seat tube 110, i.e., in the third direction D3 in Figure 12. At the same time, as shown in Figures 12 and 14, when the movable frame 220 slides toward the third direction D3, the cooperation of the guide groove 2222 and the first movable projection 15111 drives the first movable projection 15111 to slide first along the first groove portion 2222a, thereby causing the first connecting rod 1510 to slide in the direction opposite to the third direction D3. Simultaneously, as the movable frame 220 slides, the second movable projection 15231 of the second connecting rod 1520 separates from the engaging end 226 of the movable frame 220 (see Figure 13). Further pushing down on the handle frame 120 causes the handle frame 120 and the auxiliary frame 140 to pivot further, moving the first pivot shaft 97 downward and consequently pulling the first movable projection 15111 of the first connecting rod 1510 into the second groove portion 2222b. As shown in Figure 17, as the first movable projection 15111 slides into the second end 2222d of the guide groove 2222, the angle between the first connecting rod 1510 and the handle rod 122 or 123 gradually decreases, meaning the first connecting rod 1510 rotates clockwise around the first pivot shaft 97, i.e., the first connecting rod 1510 pivots in the fourth direction D4.Simultaneously, as the first connecting rod 1510 slides, the cooperation of the drive groove 1513 and the second movable projection 15231 (see Figure 5) drives the second connecting rod 1520 to rotate counterclockwise around the first connecting shaft 95, i.e., in the fifth direction D5 in Figure 14 or Figure 17. As the second connecting rod 1520 rotates, it drives the first backrest frame 410 and the backrest tube 450 pivotably connected thereto, together with the entire backrest assembly 400, to pivot and fold toward the seat assembly 200, thereby achieving the folding of the entire stroller. Figures 17a and 17b show schematic diagrams of the folded stroller, in which the movable frame 220 slides to near the front end of the seat tube 110, the first movable projection 15111 moves to the second end 2222d, and the second movable projection 15231 is located approximately in the center of the drive groove 1513. The backrest assembly 400, seat assembly 200, and carrier frame 100 are folded close to each other, making storage and carrying easy in a space-saving manner. At this time, the slide groove 1403 and the second lock groove 1503b are aligned with each other, and by releasing the first operating member 710, the first slide block 740 moves in the opposite direction to the first direction D1 by the action of a slide block return member (not shown) until the lock pin 730 is inserted into the second lock groove 1503b and the stroller is locked in the folded state.

[0140] Conversely to the folding process, if it is necessary to unfold the folded stroller, the first operating member 710 can be operated to drive the first slide block 740 via the first traction member toward the handle body 121, i.e., toward the first direction D1. At the same time, the first slide block 740 presses the first pressing portion 732 of the lock pin 730 via the second pressing portion 741, sliding the lock pin 730 toward the first direction D1 until it disengages from the second lock groove 1503b, thereby unlocking the folding lock mechanism 700 and releasing the lock on the folded state of the stroller. Subsequently, the handle frame 120 can be pulled upward to drive the first pivot shaft 97 upward. The first pivot shaft 97 drives the first connecting rod 1510 to rotate counterclockwise around the first pivot shaft 97, i.e., to pivot in the fifth direction D5 in Figure 17a, thereby moving the first movable projection 15111 along the guide groove 2222 from the second end 2222d to the first end 2222c. Simultaneously, the first connecting rod 1510, in cooperation with the drive groove 1513 and the second movable projection 15231 (see Figure 14), drives the second connecting rod 1520 to rotate clockwise around the first connecting shaft 95, i.e., in the fourth direction D4. As the second connecting rod 1520 rotates, it drives the first backrest frame 410 and the backrest tube 450 pivotably connected thereto, together with the entire backrest assembly 400, to pivot and unfold away from the seat assembly 200, as shown in Figure 14. At this time, the slide groove 1403 and the first lock groove 1503a align with each other. Then, by releasing the first operating member 710, the first slide block 740 moves in the opposite direction to the first direction D1 by the action of the slide block return member (not shown) until the lock pin 730 is reinserted into the first lock groove 1503a and the stroller is locked in the unfolded state.

[0141] A stroller according to a second aspect of this disclosure has at least the following technical effects:

[0142] In the stroller described above, the connecting rod assembly 1500 is movably connected to the carrier frame 100 and the seat assembly 200, and the backrest assembly 400 is movably connected to the seat assembly 200 via the connecting rod assembly 1500. When the carrier frame 100 is switched from the unfolded state to the folded state, the carrier frame 100 can be driven via the connecting rod assembly 1500 to fold the backrest assembly 400 toward the seat assembly 200. Overall, the folding structure is relatively simple and easy to use.

[0143] Third aspect

[0144] Referring to Figures 18 to 23, particularly Figures 18, 19, 25, and 26, a third aspect of the present disclosure provides a carrier. The carrier may be a stroller and includes a carrier frame 100, a seat assembly 200, a backrest assembly 400, and a coupling mechanism 500. The carrier frame 100 includes two opposing lateral frames 101, 102 and a handle frame 120. The seat assembly 200 is mounted between the two lateral frames 101, 102 and is configured to be movable between a first and second position P, Q in the longitudinal direction relative to the lateral frames 101, 102. The backrest assembly 400 is mounted on the seat assembly 200 and is configured to be angle-adjustable relative to the seat assembly 200. The handle frame 120 is pivotally connected to the lateral frames 101 and 102, and when pivoted relative to the lateral frames 101 and 102, it is configured to drive the seat assembly 200 to move in the front-rear direction P and Q relative to the lateral frames 101 and 102. The coupling mechanism 500 is located on one side of the seat assembly 200 and is connected to the backrest assembly 400. The coupling mechanism 500 is configured to keep the angle adjustment range of the backrest assembly 400 relative to the seat assembly 200 constant as the seat assembly 200 moves between a first position and a second position.

[0145] In this context, "maintaining the constant angle adjustment range of the backrest assembly 400 relative to the seat assembly 200" means that, when the angle of the backrest assembly 400 relative to the seat assembly 200 is not adjusted by the angle adjustment mechanism, the angle of the backrest assembly 400 relative to the seat assembly 200 remains substantially the same or unchanged within a predetermined range while the seat assembly 200 moves from the first position to the second position, or from the second position to the first position.

[0146] The carrier frame 100 may include two seat tubes 110, each provided on two lateral frames 101 and 102. The seat assembly 200 may be mounted on the seat tubes 110. In some embodiments, the lateral frame 101 includes a first front leg support rod 161 and a first rear leg support rod 171. The first front leg support rod 161 and the first rear leg support rod 171 are connected to each other, forming a substantially triangular structure with the ground. In some embodiments, the lateral frame 101 further includes a first armrest rod 132 connected to the first front leg support rod 161 and / or the first rear leg support rod 171. The first armrest rod 132 is positioned substantially parallel to the ground or at a slight angle to the ground. In some embodiments, the lateral frame 101 further includes an auxiliary frame 140, each pivotably connected to the first armrest rod 132 and the seat assembly 200. In other embodiments, the auxiliary frame 140 may be connected to the first rear leg support rod 171 and form a substantially triangular structure with the first armrest rod 132 and the first rear leg support rod 171. The lateral frame 102 is provided symmetrically with respect to the lateral frame 101. For example, the lateral frame 102 includes a second front leg support rod 162, a second rear leg support rod 172, a second armrest rod 133, and another auxiliary frame 140, which are provided symmetrically with respect to the first front leg support rod 161, the first rear leg support rod 171, the first armrest rod 132, and the auxiliary frame 140, respectively.

[0147] The seat assembly 200 is positioned to be movable (e.g., slidable) on the seat tube 110 along the longitudinal directions P and Q of the carrier frame 100. In some embodiments, the seat assembly 200 includes a movable frame 220 and a seat frame 230 attached to the movable frame 220. The movable frame 220 is positioned to be movable (e.g., slidable) on the seat tube 110 along the longitudinal directions P and Q of the carrier frame 100. In some embodiments, the movable frame 220 includes a slide sleeve 221 (see Figures 21 and 22), which slides into the seat tube 110 along the longitudinal directions P and Q of the carrier frame 100. It should be understood that the movable frame 220 can also be positioned to be movable on the seat tube 110 along the longitudinal directions P and Q of the carrier frame 100 by other means, such as by providing a slide groove.

[0148] The backrest assembly 400 may include a backrest tube 450 used to support a backrest plate (not shown). The backrest assembly 400 may be attached to the seat assembly 200 via the backrest tube 450. In some embodiments, the lower portion of the backrest tube 450 is pivotally connected to a movable frame 220, allowing the lower portion of the backrest tube 450 to slide with the movable frame 220 relative to the seat tube 110. Referring to Figures 20 and 25, in some embodiments, the backrest assembly 400 includes an adjustable harness 430 (for clarity, the harness is omitted in other figures, e.g., Figures 18 and 19, but the stroller shown in Figures 18 and 19 may also be equipped with a harness). Both ends of the adjustable harness 430 are connected to two lateral frames 101, 102, respectively. The upper central portion of the backrest tube 450 is supported by the adjustable harness 430.

[0149] The handle frame 120 is pivotable relative to the lateral frames 101 and 102, allowing the stroller 10 to be switched between a first usage state (e.g., forward-facing, as shown in Figure 18) and a second usage state (e.g., rear-facing, as shown in Figure 18). The handle frame 120 may be located outside the lateral frames 101 and 102 and pivotably connected to them. In some embodiments, the handle frame 120 is pivotably connected to an auxiliary frame 140 of the lateral frames 101 and 102. In some embodiments, the handle frame 120 is pivotably connected to the lateral frames 101 and 102 (e.g., the auxiliary frame 140) via a pivot shaft 630 (shown in Figure 21). The pivot shaft 630 may pass through the lateral frames 101 and 102 (e.g., the auxiliary frame 140). In other embodiments, the first usage state may be rear-facing and the second usage state may be forward-facing, and is not particularly limited.

[0150] As shown in Figure 20, the handle frame 120 may be connected to the seat assembly 200, for example, via a drive assembly 600 to the movable frame 220 of the seat assembly 200. The drive assembly 600 may be configured to convert the pivot of the handle frame 120 relative to the lateral frames 101, 102 into movement of the seat assembly 200 in the longitudinal direction of the carrier frame 100, for example, movement of the movable frame 220 of the seat assembly 200.

[0151] In some embodiments, the drive assembly 600 is located inside the lateral frames 101, 102. In some embodiments, referring to Figures 20 and 21, the handle frame 120 is connected to the drive assembly 600 via a pivot shaft 630 that passes through the lateral frames 101, 102. In some embodiments, the drive assembly 600 is a connecting rod mechanism.

[0152] In some embodiments, as shown in Figures 20 to 24, the drive assembly 600 includes a first drive rod 610 and a second drive rod 620 located on the side of the movable frame 220 furthest from the lateral frames 101 and 102. The first end of the first drive rod 610 is connected to the handle frame 120 via a pivot shaft 630. Specifically, one end of the pivot shaft 630 is fixedly connected to the handle frame 120, and the other end of the pivot shaft 630 is fixedly connected to the first end of the first drive rod 610 after passing through the lateral frames 101 or 102 (e.g., auxiliary frame 140) and the seat tube 110. For example, the handle frame 120 and the first end of the first drive rod 610 are provided with square holes, which allow the pivot shaft 630 to be fixedly connected to the handle frame 120 and the first end of the first drive rod 610. However, the disclosure is not limited thereto. For example, the pivot shaft 630 may be connected to components such as the handle frame 120 and the first drive rod 610 in accordance with the connection method described in the first aspect of the disclosure in relation to Figures 3 and 4. The second end of the first drive rod 610 is pivotably connected to the first end of the second drive rod 620. For example, an additional pivot shaft (not shown) may be fixed to the movable frame 220, passing through the second end of the first drive rod 610 and the first end of the second drive rod 620, with the second end of the first drive rod pivotably connected to the first end of the second connecting rod, and pivotally connected to the movable frame 220. Furthermore, an additional pivot shaft may pass through the backrest tube 450, pivotally connecting the backrest tube 450 to the movable frame 220. As the movable frame 220 moves in the front-rear direction P, Q of the carrier frame 100, the backrest tube 450 can move in sync with the movable frame 220. The second end of the second drive rod 620 is connected to the seat assembly 200, for example, the movable frame 220.When the handle frame 120 pivots relative to the lateral frames 101 and 102, the handle frame 120 can rotate the first drive rod 610 via the pivot shaft 630, and drive the seat assembly 200 to move in the front-rear direction of the carrier frame 100 via the second drive rod 620, for example, to drive the movable frame 220 to move (e.g., slide) in the front-rear direction of the carrier frame 100 relative to the seat tube 110. The above description is merely one example of a drive assembly 600, and the drive assembly 600 may have other configurations. For example, the first drive rod 610 and the second drive rod 620 may be provided between the lateral frames 101 and 102 and the seat tube 110. For example, the number of drive rods may be changed. For example, other drive mechanisms other than the connecting rod mechanism may be employed.

[0153] Referring to Figures 18 and 19, in a stroller according to a third aspect of the present disclosure, when the user rotates the handle frame 120, the handle frame 120 drives the movable frame 220 via the drive assembly 600 to move in the front-rear direction of the carrier frame 100 relative to the seat tube 110, at which time the lower part of the backrest tube 450 moves in sync with the movable frame 220, and the angle of the backrest tube 450 relative to the seat assembly 200 changes.

[0154] A third aspect of the present disclosure provides a coupling mechanism 500 configured such that when the handle frame 120 pivots relative to the lateral frames 101 and 102, the backrest assembly 400 moves in the front-rear direction of the carrier frame 100 relative to the lateral frames 101 and 102 without changing the angle relative to the seat assembly 200. Specifically, the coupling mechanism 500 is connected on one end to the handle frame 120 or the seat assembly 200 and on the other end to an adjustable harness 430 of the backrest assembly 400, so that when the handle frame 120 pivots relative to the lateral frames 101 and 102, the central upper portion of the backrest tube 450 is driven by the adjustable harness 430 to move synchronously with the lower portion of the backrest tube 450, allowing the backrest tube 450 to move synchronously with the movable frame 220 in the front-rear direction of the carrier frame 100 without pivoting relative to the movable frame 220. Here, the upper central portion of the backrest tube 450 is described relative to the lower portion of the backrest tube 450, meaning a position away from the lower portion of the backrest tube 450. The backrest assembly 400 is supported by the lower portion of the backrest tube 450 being pivotably connected to the movable frame 220, and by the cooperation of the upper central portion of the backrest tube 450 and the adjustable harness 430.

[0155] The connecting mechanism 500 of this disclosure will be described in detail below in relation to the first embodiment, the second embodiment, and the third embodiment.

[0156] Referring to Figures 18 to 24, in the first embodiment, the coupling mechanism 500 is connected to the seat assembly 200 (e.g., the movable frame 220) and to the ends of the adjustable harness 430, and is configured to move the ends of the adjustable harness 430 in synchronization with the seat assembly 200 as the seat assembly 200 moves in the front-rear direction of the carrier frame 100. This allows both the upper central portion of the backrest tube 450 supported on the adjustable harness 430 and the lower portion of the backrest tube 450 pivotally connected to the seat assembly 200 to move in synchronization with the seat assembly 200 in the front-rear direction of the carrier frame 100 without changing the angle between the backrest tube 450 and the seat assembly 200.

[0157] Referring to Figures 20 to 24, the coupling mechanism 500 may include a coupling rod 510. The first end of the coupling rod 510 is connected to the seat assembly 200, for example, the movable frame 220. The second end of the coupling rod 510 is movably mounted to the lateral frames 101 and 102 in the longitudinal direction of the carrier frame 100 and is fixedly connected to the end of the adjustable harness 430. Thus, as the seat assembly 200 moves relative to the lateral frames 101 and 102 in the longitudinal direction of the carrier frame 100, the first end of the coupling rod 510 drives the second end of the coupling rod 510, and consequently the end of the adjustable harness 430, to move in the longitudinal directions P and Q, thereby moving the central upper portion of the backrest tube 450 in the longitudinal directions P and Q. Therefore, when the seat assembly 200 moves in the front-rear direction of the carrier frame 100 relative to the lateral frames 101 and 102, the central upper portion and the lower portion of the backrest tube 450 move synchronously, the backrest tube 450 does not pivot relative to the seat assembly 200, and the angle relative to the seat assembly 200 does not change.

[0158] Referring to Figure 21, the connecting rod 510 is provided between the lateral frames 101, 102 and the seat assembly 200, for example, between the lateral frames 101, 102 and the movable frame 220. Specifically, the lateral frames 101, 102 are provided with a first slide groove 1303 that extends in the front-rear directions P and Q of the carrier frame. The second end of the connecting rod 510 is slidably attached to the first slide groove 1303. Furthermore, the first slide groove 1303 is provided on the armrest rods 132, 133. In some embodiments, the length of the first slide groove 1303 is the same as the distance the seat assembly 200 moves when it moves from a first position to a second position. However, the length of the first slide groove 1303 may be different from the distance the seat assembly 200 moves from the first position to the second position, for example, the length of the first slide groove 1303 may be greater than that distance.

[0159] As shown in Figures 21 to 24, the first end of the connecting rod 510 is connected to the movable frame 220. Specifically, the first end of the connecting rod 510 is provided with a first projection 512 on the side facing the movable frame 220. The movable frame 220 is provided with a socket or through hole 214 (see Figures 22 and 24) for receiving the first projection 512. The connecting rod 510 is connected to the movable frame 220 by fitting the first projection 512 into the socket or through hole 214. In some embodiments, the movable frame 220 is provided with a through hole 214 for receiving the first projection 512, and a second projection 212 (see Figure 24) extends from the through hole 214 in the direction opposite to the connecting rod 510, with the first projection 512 passing through the second projection 212. In some embodiments, referring to Figures 22 to 24, the movable frame 220 has a recess 213 on the side facing the connecting rod 510. The socket or through hole 214 is located within the recess 213. The first end of the connecting rod 510 can be accommodated within the recess 213. The recess 213 can restrict the first end of the connecting rod 510 from rotating counterclockwise relative to the movable frame 220. In some embodiments, the connecting mechanism 500 further includes an elastic member 520 (e.g., a torsion spring). One end of the elastic member 520 is wound around the periphery of the second projection 212, and the other end of the elastic member 520 is locked on the side of the connecting rod 510 opposite to the movable frame 220, thereby restricting the clockwise rotation of the first end of the connecting rod 510 relative to the movable frame 220. Specifically, when the handle frame 120 is pivoted from the first operating state (see Figure 18) to the second operating state (see Figure 19), the recessed portion 213 restricts the counterclockwise rotation of the first end of the connecting rod 510, thereby driving the second end of the connecting rod 510 to slide together with the first end in the first direction P (see Figure 24). Also, when the handle frame 120 is pivoted from the second operating state (see Figure 19) to the first operating state (see Figure 18), the elastic member 520 restricts the clockwise rotation of the first end of the connecting rod 510, thereby driving the second end of the connecting rod 510 to slide together with the first end in the second direction Q (see Figure 24).

[0160] The movable frame 220 may include a slide sleeve 221 and a mounting portion 224. The slide sleeve 221 is sleeve-fitted to the outside of the seat tube 110 and is movable along the seat tube 110. The mounting portion 224 is provided on the upper side of the slide sleeve 221. The socket or through hole 214, recess 213, and second projection 212 may all be provided on the mounting portion 224.

[0161] In the first embodiment relating to a third aspect of this disclosure, when the user rotates the handle frame 120 to switch between a first usage state (see, for example, Figure 18) and a second usage state (see, for example, Figure 19), the handle frame 120 drives the movable frame 220 of the seat assembly 200 to move (e.g., slide) on the seat tube 110 in the front-rear direction of the carrier frame 100 via the drive mechanism 600, during which time the lower portion of the backrest tube 450 of the backrest assembly 400 moves together with the movable frame 220 in the front-rear direction of the carrier frame 100. At the same time, the movable frame 220 drives the entire connecting rod 510 (including the first and second ends) to move in the front-rear direction of the carrier frame 100, thereby moving the end of the adjustable harness 430, and consequently the upper central portion of the backrest tube 450, together with the seat assembly 200 in the front-rear direction of the carrier frame 100. In this way, both the central upper portion and the lower portion of the backrest tube 450 move in sync with the seat assembly 200, and the angle of the backrest assembly 400 relative to the seat assembly 200 does not change.

[0162] Referring to Figures 25 to 32, in the second embodiment, the coupling mechanism 500 is connected to the handle frame 120 and the end of the adjustable harness 430, respectively, and is configured to move the end of the adjustable harness 430 in synchronization with the seat assembly 200 when the handle frame 120 pivots relative to the carrier frame 100.

[0163] Specifically, as shown in Figures 27 and 28, the coupling mechanism 500 includes a transmission assembly 530 and a sliding member 540. The sliding member 540 is slidably mounted on the lateral frames 101 and 102 in the longitudinal direction of the carrier frame 100 and is connected to the end of the adjustable harness 430. The transmission assembly 530 is connected to the pivot shaft 630, which passes through the lateral frames 101 and 102 (e.g., the auxiliary frame 140), and to the sliding member 540. The transmission assembly 530 is configured to convert the pivot of the handle frame 120 relative to the lateral frames 101 and 102 (i.e., the rotation of the pivot shaft 630) into the sliding movement of the sliding member 540 in the longitudinal direction of the carrier frame 100, thereby allowing the end of the adjustable harness 430, and consequently the upper central portion of the backrest tube 450, to move in sync with the lower portion of the backrest tube 450.

[0164] Specifically, the transmission assembly 530 may include a link gear 531, one or more driven gears 532, and an output gear 533. The link gear 531 is connected to the pivot shaft 630 via a traction member 550 and a drive wheel 560. Specifically, the drive wheel 560 is fixedly connected to the pivot shaft 630 and rotatable with the pivot shaft 630. For example, the drive wheel 560 may be sleeve-fitted to the outside of the pivot shaft 630. Referring to Figure 28, the traction member 550 is connected to both the drive wheel 560 and the link gear 531. When the drive wheel 560 rotates, it can drive the link gear 531 to rotate via the traction member 550. For example, the traction member 550 may be a cable. One end of the cable is fixed to a first position on the link gear 531. The other end of the cable extends to the drive wheel 560, winds around the drive wheel 560, and then extends again to the link gear 531, where it is fixed to a second position opposite to the first position of the link gear 531. Furthermore, the portion of the cable that winds around the drive wheel 560 is fixed to the position of the drive wheel 560 (for example, position R shown in Figure 28). When the drive wheel 560 rotates, the length of the cable portions located on both sides of the drive wheel 560 and the link gear 531 changes, thereby causing the link gear 531 to rotate. The link gear 531 meshes with one or more driven gears 532, one or more driven gears 532 further mesh with an output gear 533, and the output gear 533 further meshes with a slide member 540, so that the rotation of the link gear 531 can drive the slide member 540 to move in the front-rear direction of the carrier frame 100. The slide member 540 may be provided with teeth 541 for meshing with the output gear 533 (see Figure 29). The rotation angle of the pivot shaft 630 is small. By providing one or more driven gears 532 with teeth smaller than those of the link gear 531, the small rotation angle of the link gear 531 can be amplified to the large rotation angle of the output gear 533, allowing the slide member 540 to move over a longer distance. Note that the above detailed description is merely an example, and those skilled in the art can make many adjustments, changes, and improvements.For example, the drive wheel 560 may be omitted, and the traction member 550 may be connected to the pivot shaft 630 and the link gear 531, so that when the pivot shaft 630 rotates, it drives the link gear 531 to rotate via the traction member 550. As another example, one or more driven gears 532 or output gears 533 may be omitted as appropriate, and the link gear 531 may be directly meshed with the slide member 540. As yet another example, the number of driven gears 532 can be adjusted as appropriate.

[0165] In some embodiments, the coupling mechanism 500 is located inside the lateral frames 101 and 102 so that it is not visible to the user. In some embodiments, one or more cavities are formed in the lateral frames 101 and 102. The transmission assembly 530, slide member 540, traction member 550, and drive wheel 560 are all located within one or more cavities in the lateral frames 101 and 102.

[0166] In some embodiments, the transmission assembly 530 (including a link gear 531, one or more driven gears 532, and an output gear 533) and the sliding member 540 are both housed in one or more cavities inside the armrest rods 132, 133. The drive wheels 560 are housed in cavities inside the auxiliary frame 140 and are connected to the link gear 531 via a traction member 550.

[0167] As shown in Figures 30 to 32, the slide member 540 may include a slide portion 543 and a connecting portion 542, and the teeth 541 may be provided on the connecting portion 542. The connecting portion 542 is for meshing with the output gear 533. When the link gear rotates, it can drive the connecting portion 542 and the slide portion 543 connected thereto to slide in the front-rear direction of the carrier frame 100 via the driven gear 532 and the output gear 533.

[0168] As shown in Figures 29 to 32, the stroller further comprises a mounting seat 1700 provided in the cavity inside the armrest rods 132, 133. The mounting seat 1700 includes a housing 1710. A baffle 1711 is provided on the inner wall of the housing 1710, dividing the housing 1710 into a first accommodation space 1701 and a second accommodation space 1702. The sliding portion 543 of the sliding member 540 is located in the first accommodation space 1701 and is slidably positioned on the baffle 1711. Referring to Figure 30, the ends of the baffle 1711 may be provided with a first limiting portion 1712 and a second limiting portion 1713 to limit the sliding limit of the sliding portion 543. The distance between the first limiting portion 1712 and the second limiting portion 1713 in the longitudinal direction of the carrier frame 100 may be the same as the distance the seat assembly 200 moves between a first position and a second position in the longitudinal direction of the carrier frame 100. The link gear 531, one or more driven gears 532, and output gear 533 are arranged in the second housing space 1702, and at least one of them meshes with the connecting portion 542 of the slide member 540. The inner wall of the baffle 1711 may be provided with one or more protrusions (see Figure 31) for mounting the link gear 531, one or more driven gears 532, and output gear 533 in the second housing space 1702.

[0169] As shown in Figures 30 to 32, the mounting sheet 1700 may also include a cover 1720, which is attached to the housing 1710 and together with the housing 1710 forms a second housing space 1702. The link gear 531, one or more driven gears 532, and output gear 533 may be positioned between the cover 1720 and the housing 1710. Teeth 541 are provided at one end of the connection portion 542 of the slide member 540, extending beyond the upper end of the cover 1720 to the outside of the cover 1720. An opening 1722 (see Figure 31) may be provided on the outside of the cover 1720, through which the link gear 531, one or more driven gears 532, or output gear 533 can mesh with the connection portion 542 of the slide member 540.

[0170] Specifically, as shown in Figure 31, a step 1721 may be provided on the outside of the cover 1720. The end of the connecting portion 542 of the slide member 540, which is provided with teeth 541, may extend to this step 1721. An opening may be provided in the step 1721, allowing the teeth of the link gear 531, one or more driven gears 532, or output gear 533 to pass through the opening and mesh with the teeth 541 of the slide member 540.

[0171] In some embodiments, referring to Figure 25, the lateral frames 101, 102 (e.g., armrest rods 132, 133) are provided with a second slide groove 1304 extending in the longitudinal directions P, Q of the carrier frame 100. The end of the adjustable harness 430 passes through the second slide groove 1304 and is fixedly connected to a slide member 540 located in a cavity inside the lateral frames 101, 102, so that the end of the adjustable harness 430 can slide within the second slide groove 1304. When the slide member 540 slides in the longitudinal direction of the carrier frame 100, the end of the adjustable harness 430 is also driven to move in the longitudinal direction of the carrier frame 100 within the second slide groove 1304. The longitudinal length of the second slide groove 1304 of the carrier frame 100 may be the same as the distance the seat assembly 200 moves in the longitudinal direction of the carrier frame 100 between a first position and a second position. However, in other embodiments, the length of the second slide groove 1304 may be different from the distance the seat assembly 200 moves in the front-rear direction of the carrier frame 100 between the first and second positions, and is not limited thereto.

[0172] In some embodiments, referring to Figure 31, the sliding member 540 may be provided with a socket or through hole 544 for attaching the end of the adjustable harness 430.

[0173] In a second embodiment relating to a third aspect of the present disclosure, when the user rotates the handle frame 120 to switch between a first and second usage state, the pivot shaft 630 rotates with the handle frame 120, driving the drive wheel 560 to rotate. When the drive wheel 560 rotates, it drives the link gear 531 to rotate via the traction member 550, which in turn drives the slide member 540 to slide via one or more driven gears 532 and output gears 533, ultimately driving the end of the adjustable harness 430 and the upper central portion of the backrest tube 450 to move in the front-rear direction of the carrier frame 100. This causes the upper central portion and the lower portion of the backrest tube 450 to move synchronously, preventing an angular change between the backrest assembly 400 and the seat assembly 200.

[0174] Referring to Figures 33 and 34, the difference in the third embodiment from the first and second embodiments is that the coupling mechanism 500 includes a guide member 580 and a connecting member 590. The guide member 580 is attached to the carrier frame 100, for example, the lateral frames 101, 102, and further, as an example, to the armrest rods 132, 133 of the lateral frames 101, 102. The end of the adjustable harness 430 passes over the guide member 580 and connects to the connecting member 590. The connecting member 590 is further connected to the seat assembly 200 and is movable in the front-rear direction P, Q of the carrier frame 100 together with the seat assembly 200, thereby driving the backrest tube 450 to move synchronously with the seat assembly 200 via the adjustable harness 430.

[0175] The guide member 580 supports the end of the adjustable harness 430 and may function to support the backrest tube 450 in the middle portion of the adjustable harness 430. When the seat assembly 200 moves in the front-rear direction P, Q of the carrier frame 100, the end of the adjustable harness 430 is driven to move by the connecting member 590, which changes the length of the portion of the adjustable harness 430 between the guide member 580 and the backrest tube 450, resulting in the upper central portion of the backrest tube 450 moving in the front-rear direction P, Q of the carrier frame 100. Specifically, when the seat assembly 200 moves forward in direction P, the length of the portion of the adjustable harness 430 between the guide member 580 and the backrest tube 450 shortens, and the upper central portion of the backrest tube 450 moves forward. As the seat assembly 200 moves backward in direction Q, the length of the portion of the adjustable harness 430 between the guide member 580 and the backrest tube 450 increases, and the central upper portion of the backrest tube 450 moves backward.

[0176] The guide member 580 is positioned so that the upper central portion of the backrest tube 450 can be supported on the adjustable harness 430 after the end of the adjustable harness 430 has passed over it. For example, the guide member 580 is usually above the lower portion of the backrest tube 450, i.e., attached to the armrest rods 132, 133 of the lateral frames 101, 102, for example. The guide member 580 may be, for example, a smooth cylindrical rod, which allows the portion of the adjustable harness 430 passing over the guide member 580 to slide on it. The guide member 580 may also be, for example, a roller, which allows the adjustable harness 430 to slide more smoothly on the guide member 580. The guide member 580 is not limited to these, and may have other configurations as long as it supports the portion of the adjustable harness 430 passing over it and allows that portion to slide over it. The number of guide members 580 may be one or more as required in practice. In some embodiments, the connecting member 590 may be a separate connecting member, such as a cable, and the connecting member 590 is connected to the seat assembly 200 (e.g., the movable frame 220 or seat frame 230) and to the ends of the adjustable harness 430, respectively. In some embodiments, the connecting member 590 is part of the adjustable harness 430. In some embodiments, the connecting member 590 may be integrated with the adjustable harness 430, in other words, the ends of the adjustable harness 430 may be connected directly to the seat assembly 200 after passing over the guide member 580. However, the connecting member 590 is not limited to these, and other configurations may be adopted as long as the above-described functions can be achieved.

[0177] In a third embodiment relating to a third aspect of the present disclosure, as the seat assembly 200 moves in the front-rear direction of the carrier frame 100, the seat assembly 200 is driven to move the end of the adjustable harness 430 via the connecting member 590, thereby changing the length of the portion of the adjustable harness 430 between the guide member 580 and the backrest tube 450, and as a result, the upper central portion of the backrest tube 450 moves in the front-rear direction of the carrier frame 100. This causes the upper central portion of the backrest tube 450 to move in sync with the lower portion of the backrest tube 450, preventing a change in the angle between the backrest assembly 400 and the seat assembly 200.

[0178] Fourth aspect

[0179] Figures 35 and 36 show perspective views of a carrier 1000 according to a fourth aspect of the present disclosure. The carrier 1000 is provided with an armrest mounting unit 300. The carrier 1000 will be described below together with the armrest mounting unit 300.

[0180] In the embodiment shown in Figure 35, the carrier 1000 is exemplified as a child carrier such as a stroller. In some other embodiments, the type of carrier 1000 is not limited to a stroller, but may be, for example, a children's dining chair, a children's high chair, or a children's tricycle.

[0181] Referring to Figure 35, the child carrier 1000 includes a carrier frame 100 and a seat assembly 200. The carrier frame 100 may include a handle frame 120, an armrest frame 130, a front leg frame 160, a rear leg frame 160, etc. The carrier frame 100 has a generally symmetrical structure. The carrier frame 100 also includes two seat tubes 110 arranged symmetrically for mounting the seat assembly 200. The seat assembly 200 includes a seat frame 230 mounted between the two seat tubes 110. In some embodiments, the seat frame 230 may be covered with a soft cushion to provide a comfortable seat for the child. The armrest frame 130 includes two armrest rods 132, 133 arranged symmetrically and positioned above the seat assembly 200 to restrict the child's lateral movement. The armrest frame 130 further includes an armrest body 131 positioned laterally and above the seat assembly 200. The left and right ends of the armrest body 131 are detachably connected to the armrest rods 132 and 133, respectively, via an armrest mounting unit 300 according to a fourth aspect of the present disclosure. Referring to Figure 35, when the armrest body 131 is connected between the two armrest rods 132 and 133, the armrest body 131 may restrict the child's forward movement. Referring to Figure 36, when the armrest body 131 is removed from the armrest rods 132 and 133, the forward movement is no longer restricted, making it easier for the child to get into and out of the seat assembly 200 from the outside of the child carrier.

[0182] In some other embodiments, only one end of the armrest body 131 is detachably connected to the corresponding armrest rods 132, 133 via an armrest mounting unit 300 according to a fourth aspect of the present disclosure, and the other end of the armrest body 131 may be detachably or non-detachably connected (e.g., pivotally connected) to the corresponding armrest rods 132, 133 by other suitable structures. For example, in some other embodiments, the other end of the armrest body 131 is pivotally connected to the corresponding armrest rods 132, 133 via a pivot shaft that is perpendicular or inclined to the horizontal plane, for example. When one end of the armrest body 131 is detached from the corresponding armrest rods 132, 133, the other end of the armrest body 131 can swing from side to side about the pivot shaft, thereby releasing the restraint on the child seated in the seat assembly 200 and allowing the child to easily exit the seat assembly 200.

[0183] Referring to Figures 35 to 38, the armrest mounting unit 300 according to a fourth aspect of the present disclosure includes a first connecting sheet 310, a first magnetic element 330, a second connecting sheet 320, and a second magnetic element 348. The first connecting sheet 310 is connected to armrest rods 132 and 133, while the second connecting sheet 320 is connected to the armrest body 131. In some other embodiments, the first connecting sheet 310 may be connected to the armrest body 131, and the second connecting sheet 320 may be connected to the armrest rods 132 and 133. The first connecting sheet 310 is provided with an engaging member 327. The first magnetic element 330 is attached to the first connecting sheet 310. The second connecting sheet 320 is provided with an engaging member 341. The second magnetic element 348 is attached to the second connecting sheet 320.

[0184] When the armrest body 131 needs to be attached to the armrest rods 132 and 133, the first connecting sheet 310 and the second connecting sheet 320 are detachably connected by both a detachable snap fitting between an engaging member 341 and a engaged member 327, and magnetic attraction between a first magnetic element 330 and a second magnetic element 348. When the armrest body 131 needs to be removed from the armrest rods 132 and 133, the first connecting sheet 310 and the second connecting sheet 320 can be separated by releasing the snap fitting between the engaging member 341 and the engaged member 327. The armrest mounting unit 300 according to the fourth aspect of this disclosure has a simple structure and provides double assurance for the connection between the first connecting sheet 310 and the second connecting sheet 320 by the snap fitting between the engaging member 341 and the engaged member 327 and the magnetic attraction between the first magnetic element 330 and the second magnetic element 348.

[0185] In some embodiments, both the first magnetic element 330 and the second magnetic element 348 may be permanent magnets. Alternatively, one of the first magnetic element 330 and the second magnetic element 348 may be a permanent magnet, and the other may be made of a magnetic material that can be attracted by a permanent magnet.

[0186] Figures 39 and 40 show exploded perspective views of exemplary embodiments of the first connecting sheet 310. In some embodiments, the first connecting sheet 310 includes a connecting body 3101 and a mounting sheet 370. The connecting body 3101 is connected to the armrest rods 132, 133. More specifically, the connecting body 3101 may be attached to or integrated with the armrest rods 132, 133, for example. The mounting sheet 370 is attached to the connecting body 3101 by a fastening mechanism 376. The engaged member 327 is provided on the mounting sheet 370 and includes at least one engagement groove 312, which detachably engages with an engaging member 341. The engaging member 341 has, for example, at least one engaging portion 34111 (described later in relation to Figures 41 and 42) that protrudes toward the engagement groove 312 and detachably engages with the engagement groove 312. By providing an engagement groove 312 in the mounting sheet 370 and attaching the mounting sheet 370 to the connecting body 3101 via a fastening mechanism 376, it becomes possible to attach different mounting sheets 370 to the same connecting body 3101 and connect them to different second connecting sheets 320, thereby combining them with different models of armrest bodies 131, effectively improving the versatility of the first connecting sheet 310. In some embodiments, the mounting sheet 370 is detachably attached to the outer surface of the connecting body 3101 via a fastening mechanism 376, thereby allowing the mounting sheet 370 to be easily attached to the connecting body 3101. In some embodiments, the mounting sheet 370 may be integrated with the connecting body 3101, for example.

[0187] Figures 39 and 40 show exemplary embodiments of the fastening mechanism 376. The outer surface 3102 of the connecting body 3101 defines the engagement hole 3106 and the mounting hole 3107. The mounting sheet 370 is provided with elastic arms 3761 and connecting holes 377 at both ends. The elastic arms 3761 are used for snap-fitting into the engagement hole 3106. A fastening member (e.g., a screw) 3762 is connected to the mounting hole 3107 through the connecting hole 377. The fastening mechanism 376 includes the elastic arms 3761 and the fastening member 3762. Note that the implementation of the fastening mechanism 376 is not limited to the above example, and in some other embodiments, for example, the fastening mechanism 376 may include at least two fastening members (e.g., screws) so that the mounting sheet 370 is non-rotatably attached to the connecting body 3101.

[0188] Referring to Figure 39, in some embodiments, the outer surface 3102 of the connecting body 3101 defines a positioning groove 3103. The mounting sheet 370 is non-rotatably mounted within the positioning groove 3103. The positioning groove 3103 is, for example, a non-circular groove, and the portion of the mounting sheet 370 positioned within the positioning groove 3103 has, for example, a shape that matches the shape of the positioning groove 3103. In some embodiments, the positioning groove 3103 is, for example, a U-shaped groove having a limiting base 3104 and an opening 3109 opposite the limiting base 3104. An engagement hole 3106 is provided close to the limiting base 3104, and a mounting hole 3107 is provided close to the opening 3109. The first end of the mounting sheet 370 abuts against the limiting base 3104, and the elastic arm 3761 extends outward from the first end of the mounting sheet 370 and snaps into the engagement hole 3106. The second end of the mounting sheet 370 is adjacent to the opening 3109 and defines the connection hole 377. The engagement groove 312 is located in the center of the mounting sheet 370. In some non-illustrated embodiments, the mounting sheet 370 may be attached to the connecting body 3101 by a non-illustrated pivot shaft, for example, consisting of bolts, which functions as a fastening mechanism to attach the mounting sheet 370 to the connecting body 3101, and the mounting sheet 370 may be rotatable relative to the connecting body 3101. It will be understood that the pivot shaft must be provided so as not to interfere with the snap fitting between the engagement groove 312 and the engagement member 341, and also so as not to interfere with the arrangement of the first magnetic element 330 and the magnetic attraction between the first magnetic element 330 and the second magnetic element 348.

[0189] Referring to Figures 39 and 40, in some embodiments, the connecting body 3101 is provided with a concave platform 3108 at a position corresponding to the mounting hole 3107, and the mounting sheet 370 is provided with a convex platform 378 at a position corresponding to the connecting hole 377. When the convex platform 378 is fitted onto the concave platform 3108, the connecting hole 377 and the mounting hole 3107 are aligned with each other, making it easier to attach the fastening member 3762. It is understood that in some other embodiments, the positions of the concave platform 3108 and the convex platform 378 may be interchanged between the connecting body 3101 and the mounting sheet 370.

[0190] Referring to Figure 39, in some embodiments, the engaged member 327 includes, for example, a projection 371. The engagement groove 312 is defined on the projection 371. Referring to Figure 37, the engaged member 341 includes, for example, at least one elastic arm 3411 located within the second connecting sheet 320, each elastic arm 3411 having the aforementioned engagement portion 34111. The projection 371 of the engaged member 327 is adapted to extend into the second connecting sheet 320, so that the engagement groove 312 enters the second connecting sheet 320 and snaps into place with the engagement portion 34111 of the elastic arm 3411 to connect the first connecting sheet 310 to the second connecting sheet 320. At this time, the first magnetic element 330 and the second magnetic element 348 are close to each other and reach the desired magnetic attraction position.

[0191] Referring to Figures 38 to 40, exemplary embodiments of the mounting of the first magnetic element 330 are also shown. Specifically, the mounting sheet 370 has a housing cavity 3710 whose opening faces the connecting body 3101 and which can be covered by the connecting body 3101. The bottom of the housing cavity 3710 extends into the projection 371. The first magnetic element 330 is mounted to the bottom of the housing cavity 3710 through the opening of the housing cavity 3710 so that the first magnetic element 330 is as close as possible to the second magnetic element 348 in the second connecting sheet 320. The first magnetic element 330, positioned within the housing cavity 3710, will not fall out of the housing cavity 3710 due to shielding by the connecting body 3101.

[0192] Referring to Figures 38 to 40, in some embodiments, the connecting body 3101 may be provided with a positioning post 3105 on its outer surface 3102, for example, on the groove wall of the positioning groove 3103. The positioning post 3105 protrudes into the housing cavity 3710 through the opening of the housing cavity 3710. The cooperation between the positioning post 3105 and the housing cavity 3710 can improve the mechanical properties of the mounting sheet 370. In some embodiments, the positioning post 3105 may abut against the first magnetic element 330 to prevent the first magnetic element 330 from wobbling within the housing cavity 3710.

[0193] It will be understood that the implementation of the first magnetic element 330 is not limited to the examples described above. For example, in some other embodiments, the first magnetic element 330 may be integrated with the mounting sheet 370 by an overmolding process. In yet another embodiment, at least a portion of the mounting sheet 370 (e.g., a projection 371) may be made of magnetic material and function as the first magnetic element 330.

[0194] Figures 41 and 42 show exploded perspective views of exemplary embodiments of the second connecting sheet 320. In some embodiments, the second connecting sheet 320 has a housing space 323 and an insertion hole 3222 communicating with the housing space 323. The second magnetic element 348 and the engaging member 341 are mounted within the housing space 323. The insertion hole 3222 is used for inserting or withdrawing the engaging member 327 into or from the housing space 323. As described above, the engaging member 341 includes, for example, at least one elastic arm 3411 located within the housing space 323. The first connecting sheet 310 and the second connecting sheet 320 are detachably connected via a detachable snap fitting between the engaging portion 34111 of the elastic arm 3411 of the engaging member 341 and the engaging groove 312 of the engaging member 327 that enters the housing space 323, so that the first magnetic element 330 and the second magnetic element 348 are positioned in the desired magnetic attraction position. Referring to Figure 41, the engaging member 327 moves relative to the insertion hole 3222 along the insertion and withdrawal direction T, thereby allowing the engaging member 327 to enter or leave the housing space 323 through the insertion hole 3222.

[0195] Figures 41 and 42 show exemplary embodiments for mounting the second magnetic element 348 and the engaging member 341 to the housing space 323. The second connecting sheet 320 has mounting holes 3231 that communicate with the housing space 323. The mounting holes 3231 and the insertion holes 3222 are located on different surfaces of the second connecting sheet 320, for example, on two substantially orthogonal or intersecting surfaces of the second connecting sheet 320. The second magnetic element 348 and the engaging member 341 are attached to the support sheet 349. The support sheet 349 is inserted into the housing space 323 through the mounting holes 3231 and secured to the second connecting sheet 320 by fastening members 3492. The fastening members 3492 are, for example, screws, which are connected to holes 3498 in the support sheet 349 through holes 3229 in the second connecting sheet 320. In other embodiments, it is understood that the second magnetic element 348 and the engaging member 341 may be attached to the second connecting sheet 320 by other suitable structures.

[0196] Figures 41 and 42 show exemplary embodiments of the second magnetic element 348. Specifically, the support sheet 349 is provided with a convex platform 3495 projecting toward the insertion hole 3222. A housing cavity 34950 is formed in the convex platform 3495. Referring to Figure 38, the housing cavity 34950 has a bottom 34951 and an opening 34952, with the bottom 34951 being closer to the insertion hole 3222 than the opening 34952. The second magnetic element 348 is housed in the bottom 34951 of the housing cavity 34950 so as close as possible to the first magnetic element 330. The opening 34952 of the housing cavity 34950 may be restricted by the second connecting sheet 320 to prevent the second magnetic element 348 from accidentally coming out of the housing cavity 34950. It should be understood that embodiments of the second magnetic element 348 are not limited to the examples described above. In some other embodiments, the second magnetic element 348 may be integrated with the support sheet 349 by an overmolding process, or at least a portion of the support sheet 349 (e.g., a convex platform 3495) may be made of a magnetic material and function as the second magnetic element 348.

[0197] Figures 41 and 42 show exemplary embodiments of the engaging member 341. The engaging member 341 includes two elastic arms 3411, the first ends of which are connected, for example, by a fixing portion 3412. The fixing portion 3412 is fixed to a support sheet 349. In some other embodiments, the first ends of the two elastic arms 3411 may be separated from each other and each fixed individually to the support sheet 349. The second ends of the two elastic arms 3411 face each other. The two elastic arms 3411 are used to embrace the engaging groove 312.

[0198] As the engaged member 327 is inserted into the housing space 323 through the insertion hole 3222, when the engaged member 327 presses against the two elastic arms 3411, the two elastic arms 3411 elastically deform and move away from each other, allowing the engaged member 327 to move further within the housing space 323. When the engaging portions 34111 of the two elastic arms 3411 face the engaging groove 312, the two elastic arms 3411 automatically return to their original position and snap into the engaging groove 312 by the engaging portions 34111. If it is necessary to release the snap engagement between the engaging member 341 and the engaged member 327, a force can be applied to the two elastic arms 3411 in a direction away from each other, disengaging the engaging portions 34111 from the engaging groove 312 and allowing the engaged member 327 to be pulled out of the insertion hole 3222.

[0199] Referring to Figures 41 and 42, the fixing portion 3412 is connected to the support sheet 349, for example, via a mounting post 3497. In some embodiments, the fixing portion 3412 has, for example, a hole 34120, and the mounting post 3497 is provided on the support sheet 349 and passes through the hole 34120. The support sheet 349 is also provided with a spacer member 3491. The spacer member 3491 is provided close to the first ends of the two elastic arms 3411 and spaced apart from the mounting post 3497. When the engaged member 327 is not in the housing space 323, the two elastic arms 3411 engage with the spacer member 3491 positioned between them, restricting the position of the engaging member 341 and preventing the engaging member 341 from rotating around the mounting post 3497 and becoming unable to engage with the engagement groove 312.

[0200] Referring again to Figure 39, in some embodiments, the engagement groove 312 may include an annular groove defined on the outer circumferential wall of the projection 371. Referring to Figure 42, the engagement member 341 includes two substantially curved elastic arms 3411. The two elastic arms 3411 are positioned opposite each other and form a space 340 for accommodating the projection 371. When the engagement member 341 engages with the engagement groove 312, the two elastic arms 3411 embrace the engagement groove 312. Referring to Figures 41 and 42, each elastic arm 3411 has an engagement portion 34111 projecting toward the space 340. The engagement portion 34111 is, for example, a curved tab. The engagement portion 34111 is inserted into the engagement groove 312 and adapted to achieve a snap fit with the engagement groove 312, thereby restricting the engagementd member 327 from being withdrawn from the insertion hole 3222.

[0201] It will be understood that the implementation of the engaging member 341 and the engaging groove 312 is not limited to the examples described above. For example, in some other embodiments, the engaging groove 312 may include at least one recess formed in the outer peripheral wall of the projection 371. The engaging member 341 may include at least one elastic arm 3411 having an engaging portion 34111 adapted to be inserted into the corresponding recess. The number and structure of the elastic arms 3411 and the engaging groove 312 can be set as needed.

[0202] Referring again to Figure 36, the first connecting sheet 310 has a first contact surface 38, which is provided on at least one of the connecting body 3101 and the mounting sheet 370. The second connecting sheet 320 has a second contact surface 3220. When the first connecting sheet 310 is connected to the second connecting sheet 320, the first contact surface 38 contacts the second contact surface 3220. The protrusion 371 protrudes relative to the first contact surface 38. The insertion hole 3222 is defined by the second contact surface 3220.

[0203] In the embodiment shown in Figure 36, both the first contact surface 38 and the second contact surface 3220 are vertical planes (for example, perpendicular to the horizontal plane). The insertion and withdrawal direction T of the engaged member 327 is, for example, parallel to the horizontal plane. The second connecting sheets 320 at both ends of the armrest body 131 are positioned between the first connecting sheets 310 on the left and right armrest rods 132 and 133. To facilitate engagement between the first connecting sheet 310 and the second connecting sheet 320, the second connecting sheet 320 is pivotably connected to the armrest body 131 via a pivot shaft 325 whose axial direction is perpendicular to the insertion and withdrawal direction T.

[0204] The method for assembling and disassembling the first connecting sheet 310 and the second connecting sheet 320 will be described below with reference to Figure 36.

[0205] When it is necessary to attach the armrest body 131 to the armrest rods 132 and 133, first rotate the second connecting sheets 320 at both ends of the armrest body 131 toward each other, and then move both ends of the armrest body 131 between the left and right armrest rods 132 and 133. When the insertion hole 3222 is aligned with the projection 371, rotate the second connecting sheets 320 at both ends of the armrest body 131 toward each other, insert the projection 371 having the engagement groove 312 into the insertion hole 3222, and snap the elastic arm 3411 of the engagement member 341 into the engagement groove 312 on the projection 371.

[0206] If it is necessary to separate the armrest body 131 from the armrest rods 132 and 133, the armrest body 131 can be removed by first releasing the snap engagement between the engagement groove 312 and the elastic arm 3411, rotating the second connecting seat 320 around the pivot shaft 325, and pulling out the protruding portion 371 from the insertion hole 3222.

[0207] Referring to Figures 38, 39, and 41, in some embodiments, a rotation-limiting platform 372 is provided on the mounting sheet 370 that protrudes relative to the first contact surface 38 in order to prevent the armrest body 131 from rotating vertically relative to the armrest rods 132, 133. The rotation-limiting platform 372 and the insertion hole 3222 can be fitted in any non-circular shape, so that the rotation-limiting platform 372 is non-rotatably fitted into the insertion hole 3222 and non-rotatably engages with the second connecting sheet 320. For example, in some embodiments, the insertion hole 3222 is a U-shaped hole, and the rotation-limiting platform 372 has a corresponding U-shaped outer shape. In some other embodiments, the insertion hole 3222 may be a planar or polygonal hole, and the shape of the rotation-limiting platform 372 matches the shape of the insertion hole 3222. Referring to Figure 39, in some embodiments, the protrusion 371 protrudes from the end face of the rotation limiting platform 372 and is located within the area defined by the end face of the rotation limiting platform 372. The protrusion 371 has a miniaturized structure and protrudes into the housing space 323, thus facilitating miniaturization of the structure of the engaging member 341.

[0208] In some embodiments, the second connecting sheet 320 may be fitted with a release member 342 and an elastic return member 345 to release the snap engagement between the engaging member 341 and the engaging groove 312. More specifically, the release member 342 is operably connected to the engaging member 341 to drive the elastic arm 3411 out of the engaging groove 312. The elastic return member 345 is used to return the release member 342 to its initial position.

[0209] Referring to Figures 41 and 42, exemplary embodiments of the release member 342 are shown. In some embodiments, the second connecting sheet 320 is provided with a mounting hole 3232 opposite to the mounting hole 3231. The release member 342 includes an operating portion 3423, a shoulder portion 3429, and at least one pressing portion 3421. When the release member 342 is installed in the housing space 323 via the mounting hole 3231, the operating portion 3423 extends outward from the mounting hole 3232 and slides into the mounting hole 3232. The shoulder portion 3429 abuts against the inner wall of the second connecting sheet 320 to prevent the release member 342 from falling out of the mounting hole 3232. The number of pressing portions 3421 is equal to the number of elastic arms 3411. Each elastic arm 3411 is provided with a contact portion 3413, and each pressing portion 3421 contacts the corresponding contact portion 3413. In some embodiments, the pressing portion 3421 has a pressing inclined portion 3421a. The contact portion 3413 is a support column extending from the elastic arm 3411. The pressing inclined portion 3421a of the pressing portion 3421 contacts the contact portion 3413. When a pressing force is applied to the release member 342, the release member 342 moves, and the pressing inclined portion 3421a pushes the elastic arm 3411 apart from the engagement groove 312, releasing the snap fitting between the engagement portion 34111 and the engagement groove 312. In other embodiments, the pressing portion 3421 and the contact portion 3413 may be implemented in configurations other than those described above. For example, in some other embodiments, the contact portion 3413 may be provided with an inclined portion, and the pressing portion 3421 may be a projection that contacts the inclined portion of the contact portion 3413.

[0210] Referring to Figure 43, in some embodiments, at least one guide surface 3496 corresponding to at least one contact portion 3413 is provided within the housing space 323. The guide surface 3496 may be, for example, the side surface of the convex platform 3495. Each pressing portion 3421 is sandwiched between the convex platform 3495 and the corresponding contact portion 3413. Each pressing portion 3421 has a sliding surface 3421c that slides into the corresponding guide surface 3496. The guide surface 3496 and the sliding surface 3421c are, for example, parallel to the direction of movement of the release member 342. When the pressing portion 3421 presses the contact portion 3413, the pressing portion 3421 is supported by the guide surface 3496, which prevents elastic deformation of the pressing portion 3421. This prevents the pressing portion 3421 from being unable to properly press the contact portion 3413 in order to release the snap engagement between the engaging portion 34111 and the engaging groove 312 when it comes into contact with the contact portion 3413.

[0211] Referring to Figures 41 and 42, exemplary embodiments of the elastic return member 345 are shown. In some embodiments, the elastic return member 345 is, for example, a spring. The elastic return member 345 is installed between the release member 342 and the support sheet 349. Referring to Figure 41, in some embodiments, the support sheet 349 may be provided with a limiting piece 3493. A positioning post 3494 is provided on the limiting piece 3493. One end of the elastic return member 345 abuts against the limiting piece 3493 and is sleeve-fitted to the outside of the positioning post 3494. The other end of the elastic return member 345 extends to the inner wall of a cavity defined within the release member 342. When the pressing force applied to the release member 342 is removed, the elastic return member 345 restores the release member 342 to its initial position, thereby also restoring the engaging member 341 to its initial position. In some embodiments, the limiting piece 3493 is positioned between the second ends of the two elastic arms 3411, and by effectively utilizing the space between the second ends of the two elastic arms 3411, it contributes to making the structure of the support sheet 349 more compact.

[0212] Fifth aspect

[0213] As shown in Figures 44 and 45, a fifth aspect of the present disclosure provides a carrier which may be a stroller, wheelchair, children's dining chair, high chair, etc. The carrier of this embodiment will be described using a stroller as an example. The carrier includes a sliding carrier frame 100, a seat assembly 200, and a height adjustment mechanism 800 which is simple in structure and easy to operate.

[0214] Specifically, as shown in Figures 44 and 45, the carrier frame 100 includes at least a handle frame 120, a front leg frame 160, a rear leg frame 170, a front wheel assembly 181, and a rear wheel assembly 182. The front leg frame 160 includes a first front leg support rod 161 and a second front leg support rod 162, which are located on the left and right sides of the carrier frame 100. A footrest plate 190 (also called a foot support plate) is connected between the first front leg support rod 161 and the second front leg support rod 162. The rear leg frame 170 includes a first rear leg support rod 171 and a second rear leg support rod 172, which are located on the left and right sides of the carrier frame 100. The front wheel assembly 181 is connected to the bottom ends of the first front leg support rod 161 and the second front leg support rod 162, and the rear wheel assembly 182 is connected to the bottom ends of the first rear leg support rod 171 and the second rear leg support rod 172.

[0215] Specifically, as shown in Figures 44 and 45, the front leg support rods 161 and 162 have an elongated structure. The upper ends of the front leg support rods 161 and 162 are pivotably connected to the corresponding rear leg support rods 171 and 172 on the carrier frame 100, and the lower ends of the front leg support rods 161 and 162 are connected to the front wheel assembly 181. The footrest plate 190 is positioned between the two front leg support rods 161 and 162.

[0216] The height adjustment mechanism 800 includes a front leg support assembly 810 and a locking assembly 830. The footrest plate 190 is positioned between the two front leg support assemblies 810 and is height-adjustable relative to the two front leg support assemblies 810. The locking assembly 830 is located between the front leg support assembly 810 and the footrest plate 190 and is used to lock or unlock the height adjustment of the footrest plate 190 relative to the front leg support assemblies 810.

[0217] As shown in Figures 44 and 45, each of the front leg support assemblies 810 includes a front leg support rod 161 or 162 and a guide member 811. A locking assembly 830 is positioned between each of the two front leg support rods 161, 162 and the footrest plate 190 and is used to lock the footrest plate 190 in one direction or both directions in the height direction. In the illustrated embodiment, the guide member 811 is an elongated structure whose length is shorter than that of the front leg support rods 161, 162. The guide member 811 is fixed to either the opposing inner side of the front leg support rods 161, 162, i.e., on the side of one front leg support rod 161, 162 that faces the other front leg support rod. The extending direction of the guide member 811 is substantially the same as the extending direction of the front leg support rods 161, 162. A guide groove 8111 is provided on at least one of the front and rear sides of the guide member 811, extending in the same direction as the extension direction of the guide member 811. In this embodiment, guide grooves 8111 are provided on both the front and rear sides of the guide member 811.

[0218] As shown in Figures 45 to 46, in this embodiment, the footrest plate 190 is an integral structure and includes a footrest body 191 and clamp members 192. The footrest body 191 is generally an elongated plate structure. Two clamp members 192 are connected to both ends of the footrest body 191, respectively, and are positioned at an angle to the footrest body 191. In this embodiment, the angle between each of the two clamp members 192 and the footrest body 191 is 90 degrees. Each clamp member 192 includes a connecting portion 1921 and two fitting portions 1922 (Figure 47) connected to opposite sides of the connecting portion 1921. Both ends of the footrest body 191 are connected to the connecting portion 1921 of the clamp member 192 on the corresponding sides of the footrest body 191. The two fitting portions 1922 of the clamp member 192 are inserted into the opposing guide grooves 8111 and are slidable along the guide grooves 8111, allowing the footrest plate 190 to be moved in the height direction.

[0219] Specifically, as shown in Figures 45 and 46, the lock assembly 830 is positioned between the front leg support assembly 810 and the footrest plate 190. The lock assembly 830 can be switched between a locked state and an unlocked state. When the lock assembly 830 is in the locked state, the footrest plate 190 is fixed at a desired height relative to the front leg support assembly 810 and can be moved in a first direction D1. When the lock assembly 830 is in the unlocked state, the footrest plate 190 can be moved in a first direction D1 or a second direction D2. The first direction D1 and the second direction D2 are opposite directions and parallel to the height direction. In this embodiment, the first direction D1 is upward along the guide groove 8111, and the second direction D2 is downward along the guide groove 8111. In other embodiments, it can be understood that, conversely, the first direction D1 may be downward along the guide groove 8111 and the second direction D2 may be upward along the guide groove 8111.

[0220] Specifically, as shown in Figures 45 and 46, the lock assembly 830 includes an operating member 831, two locking members 832, two connecting members 833, a first return member 834, two second return members 835, a plurality of first locking grooves 836, a plurality of second locking grooves 837, and a plurality of third locking grooves 838. The operating member 831 is operably positioned approximately in the center of the footrest plate 190. The first return member 834 is positioned between the operating member 831 and the footrest plate 190. The two connecting members 833 are connected to both sides of the operating member 831, respectively. The two locking members 832 are connected to the sides of the two connecting members 833 that are away from the operating member 831, respectively. The two second return members 835 are positioned between the two locking members 832 and the footrest plate 190, respectively. Multiple first locking grooves 836 and multiple second locking grooves 837 are provided on two guide members 811.

[0221] The structure of the height adjustment mechanism 800 will be described in detail below, using the connection relationship between the left front leg support assembly 810, the footrest plate 190, and the lock assembly 830 as an example. The connection relationship between the right front leg support assembly 810, the footrest plate 190, and the lock assembly 830 is similar.

[0222] Furthermore, as shown in Figure 46, a plurality of first lock grooves 836 aligned in the height direction are provided on the inside of the guide member 811, that is, on the side of the guide member 811 facing the other guide member 811. All of the first lock grooves 836 are unidirectional lock grooves for restricting the footrest plate 190 from moving in the second direction D2. Specifically, each first lock groove 836 gradually decreases in depth along the first direction D1. More specifically, the upper wall of each first lock groove 836 is a first inclined contact surface 8361 that gradually inclines along the first direction D1 toward the other guide member 811 on the opposite side of the carrier. In addition, to restrict the movement of the footrest plate 190 in the second direction D2, the bottom wall of each first lock groove 836 is a restricting wall 8362 that is substantially perpendicular to the guide member 811, that is, substantially parallel to the horizontal plane.

[0223] At least one second lock groove 837 is provided on the inside of the guide member 811, that is, on the side of the guide member 811 facing the other guide member 811. The second lock groove 837 is a bidirectional lock groove that restricts the movement of the footrest plate 190 in both a first direction D1 and a second direction D2. The second lock groove 837 has a first limiting wall 8371 and a second limiting wall 8372 that face each other in the height direction. At least one second lock groove 837 is located on the first direction D1 side of the plurality of first lock grooves 836. In this embodiment, each guide member 811 is provided with two first lock grooves 836 and one second lock groove 837 on its inside. The second lock groove 837 is located above the two first lock grooves 836 and restricts the distance of movement of the footrest plate 190 in the first direction, i.e., upward. In other words, the second lock groove 837 is used to restrict excessive upward movement of the footrest plate 190. In other embodiments, the number of first lock grooves 836 and second lock grooves 837 can be arbitrarily adjusted. It is also possible to provide only a plurality of first lock grooves 836 without providing the second lock grooves 837.

[0224] As shown in Figures 45 and 48, a third locking groove 838 is provided on the inside of the guide member 811, that is, on the side of the guide member 811 facing the other guide member 811. The third locking groove 838 is located on the second direction side of the plurality of first locking grooves 836, that is, below the plurality of first locking grooves 836. The third locking groove 838 has a second inclined contact surface 8381 that gradually inclines along a first or second direction toward the other guide member 811 on the opposite side of the carrier. The third locking groove 838 further has a mounting opening 8382 facing the second inclined contact surface 8381. When the locking member 832 is in the locked state (see Figure 46), at least a portion of the locking member 832 protrudes from the footrest plate 190. When attaching the footrest plate 190 to the front leg support assembly 810, the locking member 832 is inserted into the third locking groove 838 via the mounting opening 8382, thereby allowing the footrest plate 190 to be easily attached to the front leg support assembly 810.

[0225] Furthermore, as shown in Figures 45 and 48, the height adjustment mechanism 800 may further include a limiting member 850. The limiting member 850 has a generally elongated cylindrical structure. Both ends of the limiting member 850 are fixed inside the two front leg support rods 161 and 162, respectively. The limiting member 850 is located on the second direction side of the third lock groove 838, i.e., below the third lock groove 838. When the locking member 832 is inserted into the third lock groove 838, the limiting member 850 comes into contact with the footrest plate 190, restricting the movement of the footrest plate 190 in the second direction.

[0226] In this embodiment, as shown in Figures 45 and 48, the front leg support rod 161 or 162 includes a support rod body 163 and a wheel seat connection portion 164. Both ends of the limiting member 850 are fixed to the wheel seat connection portions 164 of the two front leg support rods, respectively. When assembling the carrier, at least a portion of the locking member 832 protrudes from both ends of the footrest plate 190 and is inserted into the third lock groove 838 via the mounting opening 8382, so that the footrest plate 190 is mounted between the two support rod bodies 163. Subsequently, the wheel seat connection portions 164 to which each limiting member 850 is connected are attached to the lower ends of the two support rod bodies 163, respectively, so that the limiting member 850 is positioned below the third lock groove 838. In this way, when the locking member 832 is inserted into the third lock groove 838, the limiting member 850 comes into contact with the footrest plate 190, thereby restricting the movement of the footrest plate 190 in the second direction.

[0227] Furthermore, as shown in Figures 46 and 47, the footrest plate 190 has a hollow internal cavity 193 in which a locking member 832 and a connecting member 833 are movably disposed. The locking member 832 has a generally pin structure. The connecting member 833 has a generally rod structure and comprises a first end 8331 and a second end 8332. One end of the locking member 832 protrudes from the hollow internal cavity 193 and is insertable into a first locking groove 836 or a second locking groove 837. The other end of the locking member 832 is fixedly connected to the second end 9332 of the connecting member 833. The first end 8331 of the connecting member 833 is connected to an operating member 831. The operating member 831 is operably disposed on the footrest plate 190. At least a portion of the operating member 831 protrudes into the hollow internal cavity 193 and is connected to the connecting member 833, while the other portion of the operating member 831 protrudes outside the hollow internal cavity 193 and is operated.

[0228] Specifically, as shown in Figures 46 and 47, the locking member 832 is switchable between a locked position and an unlocked position. When the locking member 832 is in the locked position, it is inserted into one of the multiple first locking grooves 836 or at least one second locking groove 837. When the locking member 832 is in the unlocked position, it can be disengaged from the multiple first locking grooves 836 and at least one second locking groove 837.

[0229] Furthermore, as shown in Figures 46 and 47, the operating member 831 can be operated to drive the locking member 832 from the locked position to the unlocked position via the connecting member 833. The operating member 831 defines two drive grooves 8311. Specifically, each drive groove 8311 extends in a direction intersecting both the direction of movement of the operating member 831 and the direction of movement of the locking member 832. The first end 8331 of the connecting member 833 is inserted into the drive groove 8311 and is movable along the drive groove 8311. In this embodiment, a drive pin (not shown) may be provided at the first end 8331 of the connecting member 833. The drive pin is inserted into the drive groove 8311 and moves along the drive groove 8311. As shown in Figure 46, the drive groove 8311 located to the left of the operating member 831 is inclined toward the left guide member 811 along the direction of D3 (i.e., the direction in which the operating member 831 can be pushed). The end of the drive groove 8311 closest to the guide member 811 on the same side of the carrier is the first groove end 83111, and the end of the drive groove 8311 furthest from the guide member 811 on the same side of the carrier is the second groove end 83112. When the operating member 831 is pressed in direction D3, the first end 8331 of the connecting member 833 (or the drive pin of the first end 8331) moves from the first groove end 83111 to the second groove end 83112 of the drive groove 8311, thereby moving the connecting member 833 together with the locking member 832 away from the guide member 811 on the same side of the carrier, and the locking member 832 switches from the locked position to the unlocked position.

[0230] Furthermore, as shown in Figure 46, the first return member 834 is positioned between the operating member 831 and the footrest plate 190. The first return member 834 is used to apply a biasing force to the operating member 831 and move the operating member 831 so that the locking member 832 moves toward the locked position. In this embodiment, the first return member 834 is a spring and is used to provide an elastic force to return the operating member 831 to its original position. Specifically, a first mounting post 194 is provided within the hollow internal cavity 193 of the footrest plate 190. The operating member 831 defines a mounting cavity 8312 that communicates with the hollow internal cavity 193. A second mounting post 8313, opposite the first mounting post 194, is provided within the mounting cavity 8312. The first mounting post 194 is located in direction D3 toward the second mounting post 8313. Both ends of the first return member 834 are sleeve-fitted to the outside of the first mounting post 194 and the second mounting post 8313, respectively, to prevent the first return member 834 from shifting position.

[0231] Furthermore, as shown in Figures 46 and 47, the second return member 835 is positioned between the locking member 832 and the footrest plate 190. The second return member 835 is used to apply a biasing force to the locking member 832 and drive it to move toward the locked position. In this embodiment, the second return member 835 is a spring. The second return member 835 is used to provide an elastic force to return the locking member 832 to the locked position. Specifically, a first convex platform 195 is provided in the hollow internal cavity 193 portion of the footrest plate 190 to which the locking member 832 is attached. A second convex platform 8321 is provided annularly around the outer circumference of the locking member 832, opposite to the first convex platform 195. The second convex platform 8321 is located on the side of the first convex platform 195 closer to the guide member 811. The second return member 835 is sleeve-fitted to the outside of the locking member 832, and both ends of the second return member 835 abut against the first convex platform 195 and the second convex platform 8321, respectively, to prevent the second return member 835 from shifting position.

[0232] In the above embodiment, the height adjustment operation of the footrest plate 190 is as follows.

[0233] As shown in Figures 46 and 47, assume that the footrest plate 190 is at the height shown in Figure 46, i.e., the locking member 832 on the footrest plate 190 is inserted into the highest first locking groove 836. To raise the height of the footrest plate 190, the user can push the footrest plate 190 directly upward in the first direction D1, thereby causing the locking member 832 on the footrest plate 190 to move in a direction gradually away from the guide member 811 on the same side of the carrier (i.e., in the direction D4 in Figure 46, taking the locking member 832 on the left side of the carrier as an example), under the action of the first inclined contact surface 8361 of the first locking groove 836 (or, if the locking member 832 is inserted into the third locking groove 838 at this point, the second inclined contact surface 8381 of the third locking groove 838), and the second return member 835 is gradually compressed. When the locking member 832 reaches the uppermost end of the first inclined contact surface 8361, that is, when the locking member 832 disengages from the first lock groove 836, the locking member 832 returns to the unlocked position. At this point, if the user continues to push the footrest plate 190 in the first direction D1, the locking member 832 is maintained in the unlocked position by contact with the inside of the guide member 811. When the locking member 832 moves together with the footrest plate 190 and faces the second lock groove 837, the locking member 832 is inserted into the second lock groove 837 by the action of the second return member 835 and returns to the locked position. In this way, the footrest plate 190 is fixed at a higher height. It should be understood that because the second lock groove 837 is a bidirectional lock groove, the footrest plate 190 at this height cannot move any further in the first direction D1 even if the user pushes the footrest plate 190 further in the first direction D1, due to the restriction by the first limiting wall 8371. However, if the locking member 832 is inserted into one of the first locking grooves 836 at this time, the footrest plate 190 can be moved further in the first direction D1 by a pushing operation in the first direction D1.Furthermore, in the process described above, when the locking member 832 moves from the locked position to the unlocked position along the first inclined contact surface 8361, the connecting member 833 fixedly connected to the locking member 832 also moves in direction D4 (taking the connecting member 833 on the left side of the carrier as an example, as shown in Figure 46), and the operating member 831 is driven to move in direction D3 via the second end 8332 (or the locking pin located at the second end 8332), and the first return member 834 is compressed.

[0234] As shown in Figures 46 and 47, assume that the footrest plate 190 is at the height shown in Figure 46, i.e., the locking member 832 on the footrest plate 190 is inserted into the highest first locking groove 836. To lower the height of the footrest plate 190, the user pushes the operating member 831 in the first direction D3, which causes the first end 8331 of the connecting member 833 (or the locking pin on the first end 8331) to move along the drive groove 8311 from the first groove end 83111 to the second groove end 83112, and the connecting member 833 moves in the direction D4 (taking the connecting member 833 on the left side of the carrier as an example, as shown in Figure 46). Consequently, the locking member 832 also moves in the direction D4 (taking the locking member 832 on the left side of the carrier as an example, as shown in Figure 46), i.e., the locking member 832 moves away from the guide member 811 on the same side of the carrier. When the locking member 832 moves from the locked position to the unlocked position, that is, when the locking member 832 disengages from the highest first lock groove 836, the user can pull the footrest plate 190 in the second direction D2 to move the footrest plate 190 downward. When the footrest plate 190 moves to a position facing any of the other first lock grooves 836, the user releases their hand from the operating member 831, the operating member 831 returns to its initial position due to the action of the first return member 834, the connecting member 833 moves in the opposite direction to direction D4 (taking the connecting member 833 on the left side of the carrier as an example, as shown in Figure 46), and the locking member 832 is driven by the elastic force of the connecting member 833 and the second return member 835 to return from the unlocked position to the locked position and is inserted into any of the other first lock grooves 836. In this way, the footrest plate 190 is fixed at a lower height position.

[0235] As shown in Figures 49 to 51, a fifth aspect of the present disclosure also provides another embodiment of the height adjustment mechanism 800, which includes a front leg support assembly 810, a footrest plate 190, a lock assembly 830, and a clamp member 860. The structure of the front leg support assembly 810 and the lock assembly 830 is identical to that of the first embodiment of the fifth aspect. The difference between this embodiment and the first embodiment of the fifth aspect is that the footrest plate 190 and the clamp member 860 are separate parts, whereas in the first embodiment the footrest plate 190 includes a footrest body 191 and a clamp member 192 which are integrated together.

[0236] As shown in Figures 50 and 51, two clamp members 860 are connected to both ends of the footrest plate 190, respectively. In this embodiment, the clamp members 860 and the footrest plate 190 will be described in detail using the structure of one side of the footrest plate 190 as an example.

[0237] The clamp member 860 includes a clamp body 861 and a connecting portion 862, which are connected to each other, forming an angle between them. At least a portion of the clamp body 861 is inserted into a guide groove 8111 and is slidable along the guide groove 8111. Specifically, the clamp body 861 is provided with two opposing fitting portions 8612 on the side opposite to the connecting portion 862. The clamp member 860 snaps into the guide groove 8111 of the guide member 811 via these two fitting portions 8612 and can slide along the guide groove 8111. The clamp body 861 is provided with a through hole 8611. Notches 196 are provided at each end of the footrest plate 190. When the locking member 832 is in the locked position, the locking member 832 protrudes from the hollow internal cavity 193 through the notches 196. The connecting portion 862 is inserted into the notch 196, allowing the clamp member 860 to be connected to the footrest plate 190. Furthermore, when the locking member 832 is in the locked position, the locking member 832 protrudes from the hollow internal cavity 193 through the notch 196, passes through the through hole 8611, and is inserted into either the first locking groove 836 or the second locking groove 837.

[0238] As can be understood, in other embodiments not shown, the guide member 811 may be omitted. In this case, the guide groove 8111 may be provided directly on the front leg support rods 161, 162, and the clamp member 860 may snap-fit ​​directly into the guide groove 81111 of the front leg support rods 161, 162 via two fitting portions 8612.

[0239] In this embodiment, the clamp member 860 is connected to the footrest plate 190 in a retractable or movable manner. As shown in Figures 49 and 51, since the connecting portion 862 has a fixed length in the horizontal direction, when the two connecting portions 862 are inserted into the notches 196 at both ends of the footrest plate 190, the footrest plate 190 can move toward and away from the front leg support assembly 810 or clamp body 861 on either side of the carrier, that is, the footrest plate 190 becomes movable within a predetermined range in the horizontal direction. As a result, the width of the footrest area (the footrest area refers to the sum of the horizontal dimension of the footrest plate 190 and the horizontal dimension of the connecting portion 862 exposed on the outside of the footrest plate 190) can be adjusted by adjusting the insertion depth of the connecting portion 862 into the footrest plate 190. In this way, on the one hand, the problem of not being able to smoothly adjust the height of the footrest plate 190 when the widths of the two guide members 811 differ due to machining tolerances of the two front leg support assemblies 810 can be solved. On the other hand, when the front leg support assembly 810 is inclined, that is, when the front leg support rods 161, 162 or the guide member 811 are inclined, and the upward angle α between the front leg support rods 161, 162 and the footrest plate 190 is less than 90 degrees, the problem of poor sliding of the footrest plate 190 due to the change in the distance between the two front leg support rods 161, 162 from the bottom to the top of the carrier can also be solved.

[0240] The height adjustment mechanism 800 described above and the carrier equipped therewith have at least the following advantageous effects.

[0241] In the carrier height adjustment mechanism 800 described above, the lock assembly 830 is provided between the front leg support assembly 810 and the footrest plate 190. When the lock assembly 830 is locked, the footrest plate 190 is fixed to the desired height position relative to the front leg support assembly 810, and the footrest plate 190 can also be moved in a first direction D1 parallel to the height direction. When the lock assembly 830 is unlocked, the footrest plate 190 can be moved in the first direction D1 or in a second direction D2 opposite to the first direction D1. That is, since the lock assembly 830 can lock the footrest plate 190 in one direction in the height direction, the lock assembly 830 only needs to be unlocked when moving the footrest plate 190 in the second direction D2, and it is not necessary to unlock it when moving the footrest plate 190 in the first direction D1. The height adjustment mechanism 800 has a simple structure and excellent operability.

[0242] In the height adjustment mechanism 800 according to another embodiment of the present disclosure, even if there are machining tolerances in the two front leg support assemblies 810 or if the two front leg support rods 161 and 162 are inclined, the clamp member 860 can adjust not only the height but also the width of the footrest plate 190, thus making it possible to adapt to children of different ages and solving the problem of not being able to adjust the footrest plate 190 smoothly.

[0243] The technical features of the embodiments described above relating to each aspect of this disclosure can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the embodiments described above relating to each aspect of this disclosure have been described. However, as long as these combinations of technical features are not contradictory, they shall be understood to fall within the scope described herein.

[0244] The embodiments described above illustrate some of the embodiments of this disclosure, and while their description is relatively specific and detailed, it should not be interpreted as limiting the scope of this disclosure. Those skilled in the art can make various modifications and improvements without departing from the spirit of this disclosure, and all such modifications and improvements are included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure shall be defined by the appended claims.

Claims

1. Backrest assembly and A carrier frame that can be switched between a folded state and an unfolded state, A seat assembly movably positioned on the carrier frame, Connecting rod assembly, Includes, The connecting rod assembly has a first connecting rod and a second connecting rod, The first connecting rod has a first movable portion and a first pivot portion, The first movable part is movably connected to the seat assembly, The first pivot portion is pivotably connected to the carrier frame, The second connecting rod has a second movable portion and a second pivot portion, The second movable part is movably connected to the first connecting rod, The second pivot portion is pivotably connected to the backrest assembly, When the carrier frame switches from the deployed state to the folded stable state, the carrier frame drives the backrest assembly to fold toward the seat assembly via the connecting rod assembly. A career characterized by the following features.

2. The carrier frame includes a seat tube extending in the front-rear direction of the carrier, The seat assembly includes a movable frame slidably positioned on the seat tube, The movable frame has a connecting portion equipped with a guide groove, The first movable portion is inserted into the guide groove and is movable along the guide groove. The carrier according to feature 1.

3. The guide groove includes a first groove portion and a second groove portion that communicate with each other, the first groove portion extending in the direction of movement of the movable frame, and the second groove portion extending in a direction intersecting the direction of extension of the first groove portion; and / or, The guide groove has a first end and a second end, and when the carrier frame is in the unfolded state, the first movable part is located at the first end, and when the carrier frame is in the folded state, the first movable part is located at the second end. The carrier according to feature 2.

4. The carrier frame includes a handle frame that is pivotally connected to the seat tube. The handle frame is operable to rotate relative to the seat tube so that the direction of travel of the carrier can be switched between a first direction of travel and a second direction of travel. During the switching of the carrier's direction of travel from the first direction of travel to the second direction of travel, the handle frame drives the movable frame to move along the seat tube in the first direction of travel, and / or the handle frame drives the first connecting rod to move in the second direction of travel. The carrier according to feature 2.

5. The movable frame has an engaging portion, When the carrier frame is in the deployed state, the engaging portion engages with the second movable portion. When the handle frame is operated to switch the direction of travel of the carrier, the engaging portion disengages from the second moving portion. The carrier according to feature 4.

6. The first connecting rod has a drive groove between the first movable portion and the first pivot portion. The second movable portion is inserted into the drive groove and is slidable along the drive groove. The carrier according to feature 1.

7. The aforementioned backrest assembly includes a first backrest frame, a second backrest frame, and a backrest tube. The first end of the first backrest frame is pivotably connected to the second pivot portion of the second connecting rod, The second end of the first backrest frame is pivotably connected to the first end of the second backrest frame. The second end of the second backrest frame is pivotably connected to the first end of the backrest tube. The second end of the backrest tube, the portion of the second connecting rod between the second movable portion and the second pivot portion, and the movable frame are pivotably connected by a first connecting shaft. The carrier according to feature 2.

8. The second connecting rod includes a first rod portion and a second rod portion that are connected to each other and form an angle between them. The second movable portion is located at the end of the first rod portion that is away from the second rod portion, The second pivot portion is located on the second rod portion, The first connecting shaft is located at the connection point between the first rod portion and the second rod portion. The carrier according to feature 7.

9. The aforementioned backrest assembly further includes a connecting harness and a harness adjuster. Each of the sides of the carrier frame is provided with the connecting rod assembly, One end of the connecting harness is connected to the end of the second rod portion, which is on one side of the carrier frame and away from the first rod portion. The other end of the connecting harness crosses the backrest tube on the side opposite to the seat assembly and connects to the end of the second rod portion, which is away from the first rod portion, on the other side of the carrier frame. The harness adjuster is positioned on the connecting harness to adjust the length of the connecting harness. The carrier according to feature 8.

10. Includes armrest mounting unit, The aforementioned armrest mounting unit is A first connecting sheet including the engaged member, A first magnetic element arranged on the first connecting sheet, A second connecting sheet including an engaging member, The second magnetic element is arranged on the second connecting sheet, The first connecting sheet and the second connecting sheet are detachably connected via both a detachable snap fitting between the engaging member and the engaged member, and magnetic attraction between the first magnetic element and the second magnetic element. The carrier according to feature 1.

11. The second connecting sheet has a first accommodating space and an insertion hole communicating with the first accommodating space. The engaging member includes at least one elastic arm disposed within the first housing space, The engaged member is adapted to move in and out of the first housing space through the insertion hole and includes at least one engaging groove adapted to snap-fit ​​with the at least one elastic arm, The carrier according to feature 10.

12. The second connecting sheet is further equipped with a release member and an elastic return member. The release member is operablely coupled to the at least one elastic arm so as to push the at least one elastic arm and disengage it from the at least one engagement groove, The elastic return member is adapted to return the release member to its original position. The carrier according to feature 11.

13. Includes a height adjustment mechanism, The height adjustment mechanism is Front leg support assembly, A footrest plate that is slidable in the height direction along the front leg support assembly, A locking assembly provided between the front leg support assembly and the footrest plate, Includes, The lock assembly is switchable between a locked state and an unlocked state. When the lock assembly is in the locked state, the footrest plate can be fixed at a height relative to the front leg support assembly, and / or the footrest plate can be operated to move in a first direction. When the lock assembly is in the unlocked state, the footrest plate can be operated to move in the first or second direction. The first direction or the second direction is opposite to each other and parallel to the height direction. The carrier according to feature 1.

14. The aforementioned lock assembly is A first lock groove provided on the front leg support assembly and having a first inclined contact surface that gradually slopes toward the footrest plate side along the first direction, and / or a second lock groove provided on the front leg support assembly and having a first limiting wall and a second limiting wall that face each other in the height direction, A locking member is movably positioned at the end of the footrest plate and is switchable between a locked position and an unlocked position, Includes, When the locking member is in the locked position, the locking member protrudes from the end of the footrest plate and is inserted into the first lock groove or the second lock groove. When the locking member is in the unlocked position, the locking member is removed from the first lock groove or the second lock groove. The carrier according to feature 13.

15. The front leg support assembly is provided with a guide groove extending in the direction of movement of the footrest plate, the footrest plate includes a footrest body for supporting the user's foot and a clamp member integrated with the footrest body, at least a portion of the clamp member being inserted into the guide groove and slidable along the guide groove, and / or, The height adjustment mechanism further includes a clamp member positioned between the front leg support assembly and the footrest plate, the clamp member being telescopically connected to the footrest plate or movably connected to the footrest plate, the clamp member including a clamp body and a connecting portion connected to each other and forming an angle between them, at least a portion of the clamp body being inserted into the guide groove and slidable along the guide groove, a notch provided at the end of the footrest plate, and the connecting portion being inserted into the notch. The carrier according to feature 13.

16. A foldable carrier frame, A limiting block, which includes an expandable portion, is placed on the carrier frame, A movable frame positioned on the carrier frame, A backrest frame having a movable end is positioned on the carrier frame, Includes, When the carrier frame switches from an unfolded state to a folded state, the backrest frame rotates in a first direction toward the movable frame, and the telescopic portion contacts the movable end so as to apply force in a second direction opposite to the first direction. A career characterized by the following features.

17. The restriction block further includes a restriction body fixed to the carrier frame, The aforementioned expandable portion is A slide block adapted to slide-fit with the aforementioned limiting body and to abut against the movable end, An elastic return member sandwiched between the limiting body and the slide block, including, The carrier according to feature 16.

18. The limiting body has a guide groove, The aforementioned expandable portion is installed within the guide groove. The slide block is elastically expandable and contractible relative to the groove opening of the guide groove under the action of the elastic return member. The carrier according to feature 17.

19. An extension support portion extending outward is provided at the lower part of the groove opening of the guide groove, and / or a limiting projection is provided at or above the upper part of the groove opening of the guide groove. The carrier according to feature 18.

20. A limiting mechanism is provided between the slide block and the limiting body to restrict the sliding movement of the slide block. The aforementioned limiting mechanism is The groove wall of the guide groove and the limiting hole provided in one of the slide blocks, The groove wall of the guide groove and the limiting projection provided on the other side of the slide block, Includes, The restricting projection slides into the restricting hole. The carrier according to feature 18.

21. The restriction block further includes a restriction body fixed to the carrier frame, The aforementioned expandable portion is attached to the limiting body and is elastically deformable. The carrier according to feature 16.

22. The movable frame is movably arranged on the carrier frame, When the carrier frame is in the deployed state, the movable end is sandwiched between the limiting block and the movable frame. During the switching of the carrier frame to the folded state, the movable frame moves away from the restricting block to allow the rotation of the backrest frame. The carrier according to feature 16.

23. Carrier frame and A seat assembly attached to the carrier frame and movable between a first position and a second position in the front-rear direction of the carrier frame, A backrest assembly comprising a harness and a backrest tube supported on the harness, wherein the lower part of the backrest tube is pivotably connected to the seat assembly, A handle frame pivotably connected to the carrier frame, wherein when the handle frame pivots relative to the carrier frame, the handle frame drives the seat assembly to move relative to the carrier frame in the front-rear direction of the carrier frame, A coupling mechanism is provided on the side of the seat assembly, and connected to one end of the harness such that the one end of the harness can move synchronously with the seat assembly in the front-rear direction of the carrier frame. including, A career characterized by the following features.

24. The aforementioned coupling mechanism includes a coupling rod, The first end of the connecting rod is connected to the seat assembly, The second end of the connecting rod is connected to the end of the harness. When the seat assembly moves in the front-rear direction of the carrier frame, the seat assembly drives the ends of the harness to move in the front-rear direction of the carrier frame via the connecting rod. The carrier according to feature 23.

25. The carrier frame includes a lateral frame and a seat tube attached to the lateral frame, The seat assembly includes a movable frame mounted on the seat tube, and when the handle frame pivots relative to the carrier frame, the handle frame drives the movable frame to move relative to the seat tube in the front-rear direction of the carrier frame. The connecting rod is positioned between the movable frame and the lateral frame, the movable frame has a recess on the side facing the connecting rod, the first end of the connecting rod is housed in the recess, and the second end of the connecting rod is movably connected to the lateral frame along the front-rear direction of the carrier frame, and when the movable frame moves in the front-rear direction of the carrier frame relative to the seat tube, the movable frame drives the end of the harness to move in the front-rear direction of the carrier frame via the connecting rod. The carrier according to feature 23.

26. The movable frame is provided with a second projection on the side opposite to the connecting rod, and the connecting mechanism further includes an elastic member, one end of which is wrapped around the periphery of the second projection, and the other end of which is locked to the side of the connecting rod opposite to the movable frame. The carrier according to feature 25.

27. The coupling mechanism includes a transmission assembly and a sliding member, the sliding member being slidably mounted on the carrier frame in the front-rear direction and connected to the end of the harness. The transmission assembly is connected to the handle frame and the slide member, respectively, and converts the rotation of the handle frame into the forward and backward movement of the slide member on the carrier frame, thereby moving the end of the harness in the forward and backward direction of the carrier frame in synchronization with the seat assembly. The carrier according to feature 23.

28. The transmission assembly includes a link gear, the sliding portion of which has teeth, the handle frame is fixedly connected to a pivot shaft inserted through the carrier frame, the pivot shaft is connected to the link gear to drive the link gear to rotate, and the link gear meshes with the teeth of the sliding portion to drive the sliding portion to move in the front-rear direction of the carrier frame when the link gear rotates. The carrier according to feature 27.

29. The connecting mechanism includes a guide member and a connecting member, the guide member being attached to the carrier frame, the end of the harness passing around the guide member so as to connect to the connecting member, the connecting member being further connected to the seat assembly and movable in the front-rear direction of the carrier frame together with the seat assembly so as to drive the backrest tube to move synchronously with the seat assembly via the harness, the connecting member being a separate member from the harness or integrated with the harness. The carrier according to feature 23.

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