Frame and stroller for a baby

Abstract

The present application relates to a kind of frame and baby stroller, the frame includes steering wheel connecting seat, front connecting seat, rear connecting seat and folding linkage mechanism, steering wheel connecting seat, front connecting seat and rear connecting seat are pivotally connected, folding linkage mechanism is arranged between steering wheel connecting seat, front connecting seat and rear connecting seat;When the frame is switched from unfolded state to folding state, one of steering wheel connecting seat, front connecting seat and rear connecting seat moves, and the other two of steering wheel connecting seat, front connecting seat and rear connecting seat are driven to rotate and fold by folding linkage mechanism.This frame is simple in structure, and the folded frame is thinner.

Description

Technical Field

[0001] This invention relates to the technical field of infant and toddler vehicles, and in particular to a frame and an infant and toddler stroller. Background Technology

[0002] In recent years, strollers have become an essential tool for traveling with infants and toddlers. To facilitate storage and transportation, most strollers now feature foldable frames. However, many foldable frames on the market are complex in structure, and even when folded, they remain quite thick. Summary of the Invention

[0003] Therefore, it is necessary to provide a frame and stroller for addressing the above problems. The frame and stroller have a simple structure and are relatively thin when folded.

[0004] A bicycle frame includes a rider connector, a front connector, a rear connector, and a retraction linkage mechanism. The rider connector, the front connector, and the rear connector are pivotally connected by a pivot shaft. The retraction linkage mechanism is disposed between the rider connector, the front connector, and the rear connector. When the bicycle frame switches from an extended state to a retracted state, one of the rider connector, the front connector, and the rear connector moves, and drives the other two of the rider connector, the front connector, and the rear connector to rotate and retract together through the retraction linkage mechanism.

[0005] In the aforementioned frame, the rider connector, front connector, and rear connector are pivotally connected via pivot shafts. These connectors can be connected to the rider frame, front wheel frame, and rear wheel frame, respectively. A retraction linkage mechanism is provided between the rider connector, front connector, and rear connector. When the frame switches from the extended state to the retracted state, the rider connector rotates, driving the front connector to rotate towards the rear connector and retract through the retraction linkage mechanism; alternatively, the rider connector rotates, driving the rear connector to rotate towards the front connector and retract through the retraction linkage mechanism. This frame structure is simple, and the retracted frame is relatively thin.

[0006] In one embodiment, the rider connection seat, the front connection seat, and the rear connection seat are pivotally connected by a pivot shaft, and the retraction linkage mechanism includes:

[0007] A drive component is disposed through the driver's connecting seat, the front connecting seat and the rear connecting seat, and is spaced apart from the pivot shaft;

[0008] The driver's connecting seat is provided with a first through slot, the front connecting seat is provided with a second through slot, and the rear connecting seat is provided with a third through slot. The first through slot, the second through slot, and the third through slot at least partially overlap, and the driving member passes through the first through slot, the second through slot, and the third through slot.

[0009] In one embodiment, the first and second through-slots are arc-shaped slots, and the third through-slot is a straight slot. The first through-slot is recessed towards the pivot axis, the second through-slot is recessed towards the pivot axis, and the projection of the third through-slot along a direction parallel to the pivot axis is always located between the projections of the first and second through-slots along the same direction parallel to the pivot axis; or

[0010] The first through groove and the third through groove are arc-shaped grooves, and the second through groove is a straight groove. The first through groove is recessed towards the pivot axis, and the third through groove is recessed towards the pivot axis. The projection of the second through groove along the direction parallel to the pivot axis is always located between the projections of the first through groove and the third through groove along the direction parallel to the pivot axis.

[0011] In one embodiment, the first and second through-slots are arc-shaped slots, and the third through-slot is a straight slot. The first through-slot is recessed towards the pivot axis, and the second through-slot is recessed towards the pivot axis. The projection of the third through-slot along a direction parallel to the pivot axis is always located between the projections of the first and second through-slots along the same direction parallel to the pivot axis. The third through-slot has a first end near the pivot axis and a second end away from the pivot axis. When the frame is in the unfolded state, the drive member is located at the first end of the third through-slot, and the first through-slot is located on the first side of the third through-slot, and the second through-slot is located on the second side of the third through-slot. When the frame is in the retracted state, the drive member is located at the second end of the third through-slot, and the first through-slot is located on the second side of the third through-slot, and the second through-slot is located on the first side of the third through-slot.

[0012] In one embodiment, the retraction linkage mechanism further includes:

[0013] The driven member passes through the front connecting seat and the rear connecting seat, and is spaced apart from the pivot shaft and the driving member; and

[0014] A linkage connects the driven member and the driving member;

[0015] When the driver's connecting seat rotates, the driving member drives the front connecting seat and the rear connecting seat to rotate in opposite directions through the driven member and the connecting rod.

[0016] In one embodiment, one of the front connector and the rear connector is provided with a first through hole, and the other of the front connector and the rear connector is provided with a fourth through slot. The first through hole and the fourth through slot at least partially overlap, and the follower is inserted into the first through hole and the fourth through slot.

[0017] In one embodiment, the first through groove and the second through groove are arc-shaped grooves, and the third through groove is a straight groove. The first through groove is recessed towards the pivot axis, and the second through groove is recessed towards the pivot axis. The projection of the third through groove along a direction parallel to the pivot axis is always located between the projections of the first through groove and the second through groove along a direction parallel to the pivot axis. The front connecting seat has the first through hole, which is offset from the second through groove. The rear connecting seat has the fourth through groove, which is an arc-shaped groove offset from the third through groove.

[0018] In one embodiment, the third through-slot has a first end near the pivot axis and a second end away from the pivot axis, the center of the fourth through-slot coincides with the pivot axis, the fourth through-slot is located on one side of the third through-slot, and the fourth through-slot has a first end near the third through-slot and a second end away from the third through-slot; when the frame is in the unfolded state, the drive member is located at the first end of the third through-slot, and the driven member is located at the second end of the fourth through-slot; when the frame is in the retracted state, the drive member is located at the second end of the third through-slot, and the driven member is located at the first end of the fourth through-slot.

[0019] In one embodiment, the rider connector, the rear connector, and the front connector are pivotally connected by a pivot shaft. The retraction linkage mechanism includes a drive member, a first linkage rod, and a first driven member. The first driven member is located between the rider connector and the rear connector. The rear connector has a fifth through slot, which is a through groove. The drive member passes through one end of the first linkage rod and the fifth through slot. The side of the rear connector facing the rider connector also has a sixth through slot, which is a blind slot. The rider connector has a second through hole. The first driven member passes through the second through hole and the other end of the first linkage rod and is inserted into the sixth through slot.

[0020] In one embodiment, the retraction linkage mechanism further includes a second connecting rod and a second driven member. The second driven member is located between the front connecting seat and the rear connecting seat. The driving member passes through the fifth through slot and its two ends are respectively connected to one end of the first connecting rod and one end of the second connecting rod. The side of the rear connecting seat facing the front connecting seat is also provided with a seventh through slot, which is a blind slot. The front connecting seat is provided with a third through hole. The second driven member passes through the third through hole and the other end of the second connecting rod and is inserted into the seventh through slot.

[0021] In one embodiment, the frame further includes a locking mechanism disposed between the rider connector, the front connector, and the rear connector. The locking mechanism is switchable between a locked state and an unlocked state. When the locking mechanism is in the locked state, the frame is locked in an extended or retracted state. When the locking mechanism is in the unlocked state, the frame is switchable between an extended and retracted state.

[0022] In one embodiment, the locking mechanism includes:

[0023] The first locking element is switchable between a first locking position and a first unlocking position;

[0024] A first operating element is driven and connected to the first locking element; the first operating element, when operated, can drive the first locking element to move toward the first unlocking position.

[0025] An elastic reset member is adapted to apply force to the first locking member to move it toward the first locked position;

[0026] The rider connector has a first locking hole, the front connector has a second locking hole, and the rear connector has a third locking hole. The first, second, and third locking holes are all spaced apart from the pivot shaft. When the first locking member is in the first locking position, it is adapted to be inserted into the first, second, and third locking holes to lock the frame in an extended or retracted state. When the first locking member is in the first unlocking position, it is adapted to be removed from the third, second, and first locking holes to allow the frame to switch between an extended and retracted state.

[0027] In one embodiment, the locking mechanism further includes:

[0028] A linkage, one end of which is fixedly connected to the first locking member, and the other end of which is drivenly connected to the first operating member;

[0029] When the first operating member is operated, it can drive the first locking member to move to the first unlocking position through the linkage.

[0030] In one embodiment, the locking mechanism further includes:

[0031] The second locking element is movable between a second locked position and a second unlocked position; and

[0032] The mounting base has a first locking groove;

[0033] The first operating member has a second locking groove, and the first locking groove and the second locking groove are connected; when the second locking member is in the second locking position, a part of the second locking member is located in the first locking groove, and another part of the second locking member is located in the second locking groove, and the first operating member cannot be operated; when the second locking member is in the second unlocking position, the second locking member is located in the first locking groove or the second locking groove, and the operating knob can be operated.

[0034] In one embodiment, the frame further includes a seat retainer and a seat frame, the seat retainer being adapted for detachable connection to the seat frame, the seat retainer being pivotally connected to the driver's seat, the front connecting seat, and the rear connecting seat, and the locking mechanism further includes:

[0035] The auxiliary locking element is switchable between a third locking position and a third unlocking position; and

[0036] An auxiliary operating element, connected to the auxiliary locking element, is operable to drive the auxiliary locking element to move between the third locking position and the third unlocking position;

[0037] The driver's connector, the front connector, or the rear connector has a first auxiliary locking hole, and the seat fixing seat has a second auxiliary locking hole. When the auxiliary locking member is in the third locking position, the auxiliary locking member is adapted to be inserted into the second auxiliary locking hole and the first auxiliary locking hole to lock the seat fixing seat relative to the driver's connector, the front connector, or the rear connector. When the auxiliary locking member is in the third unlocking position, the auxiliary locking member is adapted to be moved out from the first auxiliary locking hole and the second auxiliary locking hole so that the seat fixing seat can rotate relative to the driver's connector, the front connector, or the rear connector.

[0038] In one embodiment, there are two of each of the rider connector, the front connector, the rear connector, and the retraction linkage mechanism, which are respectively disposed on the left and right sides of the frame. The frame also includes a cross tube, the two ends of which are respectively connected to two rider connectors. There are two first locking members and two elastic reset members. The two first locking members are used to lock the rider connector, the front connector, and the rear connector on both sides, respectively. The two elastic reset members are adapted to apply force to the two first locking members. At least a portion of the two first locking members and the two elastic reset members are disposed inside the cross tube. The first operating member is movably disposed in the cross tube and is drivenly connected to the two first locking members respectively.

[0039] In one embodiment, the frame further includes:

[0040] A seat frame suitable for supporting infants and young children, the seat frame having a first engaging portion;

[0041] The seat fixing seat is pivotally connected to the driver's connecting seat, the front connecting seat, and the rear connecting seat. The seat fixing seat is provided with a second engaging part, which is adapted to detachably engage with the first engaging part.

[0042] In one embodiment, there are two of each of the seat fixing seat, the rider connection seat, the front connection seat, the rear connection seat, and the retraction linkage mechanism, which are respectively disposed on the left and right sides of the frame. The seat fixing seat, the rider connection seat, the front connection seat, the rear connection seat, and the retraction linkage mechanism on either side are pivotally connected by a pivot shaft. The frame also includes a cross tube, the two ends of which are respectively connected to the two seat fixing seats. The connection point of the cross tube with any of the seat fixing seats is offset from the corresponding pivot shaft.

[0043] In one embodiment, the seat fixing seat is sleeved outside the horizontal tube and can rotate around the horizontal tube. The seat frame has a forward mounting position and a rearward mounting position relative to the seat fixing seat. When the seat frame is in the forward mounting position, during the process of the vehicle frame switching from an unfolded state to a folded state, the seat fixing seat is adapted to pivot relative to the horizontal tube until the second engaging part is located on the front side of the horizontal tube. When the seat frame is in the rearward mounting position, during the process of the vehicle frame switching from an unfolded state to a folded state, the seat fixing seat is adapted to pivot relative to the horizontal tube until the second engaging part is located on the rear side of the horizontal tube.

[0044] A locking mechanism, comprising:

[0045] The first connecting seat is equipped with a guide rail; and

[0046] The second connecting seat is equipped with a sliding component;

[0047] The first connecting seat and the second connecting seat are pivotally connected to each other. The locking mechanism can switch between a first locked state and a first unlocked state through the cooperation of the guide rail and the sliding member. When the locking mechanism is in the first locked state, the first connecting seat and the second connecting seat are relatively fixed. When the locking mechanism is in the first unlocked state, the first connecting seat and the second connecting seat can rotate relative to each other. The sliding trajectory of the sliding member along the guide rail is perpendicular to the pivot axis of the first connecting seat and the second connecting seat.

[0048] In one embodiment, the slider has a frame locking position and a frame unlocking position on the guide rail. When the slider is in the frame locking position, the locking mechanism is in a first locking state; when the slider is in the frame unlocking position, the locking mechanism is in a first unlocking state.

[0049] In one embodiment, the guide rail includes an arc-shaped track centered on the pivot axis of the first connecting seat and the second connecting seat.

[0050] In one embodiment, the guide rail is a guide groove, and the slider is located in the guide groove and can slide along the guide groove.

[0051] In one embodiment, the guide groove has a locking recess. When the slider is in the locked position of the frame, the slider engages with the locking recess, and the locking mechanism is in a first locked state. When the slider is in the unlocked position of the frame, the slider moves out of the locking recess, and the locking mechanism is in a first unlocked state.

[0052] In one embodiment, there are at least two locking recesses, and the slider engages with any one of the at least two locking recesses to fix the first connecting seat and the second connecting seat in any one of at least two relative positions.

[0053] In one embodiment, the guide groove includes an arcuate groove centered on the pivot axis of the first connector and the second connector, wherein at least part of the side wall of the guide groove near the pivot axis is recessed toward the pivot axis to form the locking recess.

[0054] In one embodiment, the locking mechanism further includes a first reset member adapted to apply force to the slider to move the slider toward the frame locking position.

[0055] In one embodiment, the locking mechanism further includes a release element adapted to be operated to drive the slider to move toward the unlock position of the frame.

[0056] A frame, comprising:

[0057] The first frame has both an unfolded and a folded state; and

[0058] The locking mechanism described in any of the foregoing items;

[0059] When the locking mechanism is in the first locking state, the first frame is locked in either the unfolded or folded state. When the locking mechanism is in the first unlocking state, the first frame can switch between the unfolded and folded states.

[0060] In one embodiment, the first frame includes a first bracket and a second bracket, the first bracket being connected to or integrally formed with the first connecting seat, and the second bracket being connected to or integrally formed with the second connecting seat.

[0061] In one embodiment, the frame further includes:

[0062] The second frame is installed on the first frame and has both a usable and a folded state; and

[0063] The locking joint is located in the second frame;

[0064] The second frame can be operated to drive the locking joint to switch the locking mechanism to the first unlocking state.

[0065] In one embodiment, the locking joint includes:

[0066] The drive seat is provided with a first pushing part; and

[0067] A pusher, one end of which is provided with a first abutting part that abuts against the first pusher portion, and the other end of which is adapted to be drivenly connected to the locking mechanism;

[0068] The drive seat can be operated to push the first abutting part against the first pushing part, thereby driving the pushing member to switch the locking mechanism to the first unlocking state.

[0069] In one embodiment, the locking joint further includes:

[0070] First locking seat;

[0071] The second locking seat is pivotally connected to the first locking seat;

[0072] A seat locking member has a second abutment portion, the seat locking member is disposed between a first locking seat and a second locking seat, and is switchable between a seat locking position and a seat unlocking position. When the seat locking member is in the seat locking position, the first locking seat and the second locking seat are relatively fixed; when the seat locking member is in the seat unlocking position, the first locking seat and the second locking seat are rotatable relative to each other.

[0073] The drive seat also has a second pushing part, which can be operated to push the second abutting part against the second pushing part, thereby driving the seat locking member to switch from the seat locking position to the seat unlocking position.

[0074] In one embodiment, the locking joint further includes:

[0075] The second reset member is adapted to apply force to the seat lock member to move the seat lock member toward the seat lock position.

[0076] In one embodiment, the first locking seat is connected to or integrally formed with the second frame, and the second locking seat is connected to or integrally formed with the locking mechanism. The first locking seat and the second locking seat are pivotally connected to each other. When the seat locking member is in the seat locking position, the first locking seat and the second locking seat are relatively fixed, and the second frame and the locking mechanism are relatively fixed. When the seat locking member is in the seat unlocking position, the first locking seat and the second locking seat can rotate relative to each other, and the second frame and the locking mechanism can rotate relative to each other.

[0077] In one embodiment, the second frame includes a seat and a backrest. The drive seat is connected to the backrest, and the first locking seat is connected to the seat. The drive seat is pivotally connected to the first locking seat. The locking joint is switchable between a second locked state and a second unlocked state. When the locking joint is in the second locked state, the seat and the backrest are relatively fixed to keep the second frame in use, and the seat is in a first rotational position relative to the first frame. When the locking joint is in the second unlocked state, the backrest can rotate toward the seat to switch the second frame to a folded state, and the seat is in the first rotational position relative to the first frame. When the seat rotates relative to the locking mechanism from the first rotational position to the second rotational position, the seat drives the drive seat to rotate and pushes against the first abutment through the first pusher, thereby driving the pusher to drive the locking mechanism to switch to the first unlocked state.

[0078] In one embodiment, the first pushing portion is an arc-shaped protrusion centered on the pivot center of the drive seat and the first locking seat, and the side of the first pushing portion facing the pushing member forms a first pushing slope; the second pushing portion is an arc-shaped protrusion centered on the pivot center of the drive seat and the second locking seat, and the side of the second pushing portion facing the seat locking member forms a second pushing slope.

[0079] A frame, comprising:

[0080] The first frame has both an unfolded and a folded state; and

[0081] A locking mechanism is provided on the first frame. The locking mechanism can switch between a first locked state and a first unlocked state. When the locking mechanism is in the first locked state, the first frame is locked in an unfolded state or a folded state. When the locking mechanism is in the first unlocked state, the first frame can switch between an unfolded state and a folded state.

[0082] In one embodiment, the locking mechanism has a guide rail and a slider that can slide along the guide rail, and the locking mechanism can switch between a first locked state and a first unlocked state through the cooperation of the guide rail and the slider.

[0083] In one embodiment, the slider has a frame locking position and a frame unlocking position on the guide rail. When the slider is in the frame locking position, the locking mechanism is in a first locking state; when the slider is in the frame unlocking position, the locking mechanism is in a first unlocking state.

[0084] In one embodiment, the frame locking position includes an unfolded locking position and a folded locking position. When the slider is in the unfolded locking position, the locking mechanism is in a first locking state, and the first frame is locked in the unfolded state. When the slider is in the folded locking position, the locking mechanism is in the first locking state, and the first frame is locked in the folded state.

[0085] In one embodiment, the guide rail is a guide groove, the slider is located in the guide groove and can slide along the guide groove, the guide groove has a locking recess, when the slider is in the locked position of the frame, the slider is engaged in the locking recess, and the locking mechanism is in a first locked state; when the slider is in the unlocked position of the frame, the slider moves out of the locking recess, and the locking mechanism is in a first unlocked state.

[0086] In one embodiment, the locking recess includes a first locking recess and a second locking recess. When the slider is engaged with the first locking recess, the locking mechanism is in the first locking state, and the first frame is locked in the unfolded state. When the slider is engaged with the second locking recess, the locking mechanism is in the first locking state, and the first frame is locked in the folded state.

[0087] In one embodiment, the depth of the first locking recess is greater than the depth of the second locking recess.

[0088] In one embodiment, the locking mechanism further includes a first connecting seat and a second connecting seat, the first connecting seat and the second connecting seat being pivotally connected to a pivot axis, the guide groove being disposed on the first connecting seat, the sliding member being disposed on the second connecting seat, the guide groove including an arc-shaped groove centered on the pivot axis of the first connecting seat and the second connecting seat, and the side wall of the guide groove near the pivot axis being at least partially recessed towards the pivot axis to form the first locking recess and the second locking recess.

[0089] In one embodiment, the unfolded locking position is closer to the pivot axis than the folded locking position; the folded locking position is closer to the pivot axis than the frame release position.

[0090] In one embodiment, the frame further includes:

[0091] The second frame is installed on the first frame and has both a usable and a folded state; and

[0092] The locking joint is located in the second frame;

[0093] The locking joint is switchable between a second locked state and a second unlocked state. When the locking joint is in the second locked state, the second frame is locked in the use state. When the locking joint is in the second unlocked state, the second frame can be operated to switch to the folded state, and the sliding member is driven to move to the unlocked position of the frame through the locking joint. The second frame can also be operated to drive the locking joint to drive the locking mechanism to switch to the first unlocked state.

[0094] In one embodiment, the locking joint includes:

[0095] First locking seat;

[0096] The second locking seat is pivotally connected to the first locking seat;

[0097] A seat locking member has a second abutment portion, the seat locking member is disposed between a first locking seat and a second locking seat, and is switchable between a seat locking position and a seat unlocking position. When the seat locking member is in the seat locking position, the first locking seat and the second locking seat are relatively fixed; when the seat locking member is in the seat unlocking position, the first locking seat and the second locking seat are rotatable relative to each other.

[0098] The drive unit has a second pusher section;

[0099] The drive seat can be operated to push the second abutment through the second push portion, thereby driving the seat locking member to switch from the seat locking position to the seat unlocking position.

[0100] In one embodiment, the locking joint further includes:

[0101] A pusher, wherein one end of the pusher is provided with a first abutting portion;

[0102] The drive seat is provided with a first pushing part, and the other end of the pushing part is adapted to abut against the locking mechanism. The drive seat can be operated to push the first abutting part through the first pushing part, thereby driving the pushing part to drive the locking mechanism, so that the locking mechanism switches to a first unlocking state.

[0103] In one embodiment, the locking joint further includes:

[0104] Drive unit;

[0105] A driving member, pivotally connected to the driving seat, and having a first driving part;

[0106] The first pusher is mounted on the drive seat and rotates with the drive seat, and has a first pusher that can abut against the first drive part;

[0107] A seat locking component for driving connection with the locking mechanism;

[0108] When the second frame is in the folded state, the drive member is adapted to be operated to push the first push part through the first drive part, thereby driving the seat locking member to switch the locking mechanism to the first unlocking state.

[0109] In one embodiment, the locking joint further includes:

[0110] First locking seat;

[0111] The second locking seat is pivotally connected to the first locking seat;

[0112] The seat locking member is disposed between the first locking seat and the second locking seat, and can be switched between a seat locking position and a seat unlocking position. When the seat locking member is in the seat locking position, the first locking seat and the second locking seat are relatively fixed. When the seat locking member is in the seat unlocking position, the first locking seat and the second locking seat can rotate relative to each other. The first pushing member has a second pushing part. The drive seat can be operated to drive the first pushing member to move, and push the seat locking member from the seat locking position to the seat unlocking position through the second pushing part.

[0113] In one embodiment, the locking joint further includes:

[0114] The second pusher is disposed between the seat locking member and the first locking seat;

[0115] One side of the second pusher abuts against the second pusher portion, and the other side of the second pusher abuts against the seat locking member.

[0116] In one embodiment, the drive seat is pivotally connected to the first locking seat on the side of the first locking seat opposite to the second locking seat. The drive seat has a first guide hole, the first locking seat has a second guide hole, the second pusher has a push post, the second push portion of the first pusher passes through the first guide hole between the drive seat and the first locking seat, and the push post of the second pusher passes through the second guide hole to abut against the second push portion.

[0117] In one embodiment, the locking joint further includes:

[0118] The second reset member is adapted to apply force to the seat lock member to move the seat lock member toward the seat lock position.

[0119] In one embodiment, the locking joint further includes:

[0120] The retraction mechanism is driven by the drive mechanism.

[0121] In this configuration, the second frame is in a retracted state. The retracting operation member is adapted to be operated to drive the driving member to rotate relative to the driving seat, and pushes the first pushing member against the first pushing member through the first driving part, thereby moving the first pushing member. The second pushing member then pushes the seat locking member, causing the seat locking member to drive the locking mechanism to switch to the first unlocking state.

[0122] In one embodiment, the second frame further includes a handrail portion, and the first locking seat further includes a handrail connecting portion, wherein the handrail portion is connected to the handrail connecting portion;

[0123] The locking joint also includes:

[0124] The third locking element is movably disposed in the armrest connection part and can be switched between a restricted position and a disengaged position;

[0125] The third locking member and the drive seat each have a limiting protrusion and a limiting recess. When the second frame is in the unfolded state, the third locking member is in the disengaged position, and the limiting protrusion and the limiting recess are spaced apart. When the second frame switches from the unfolded state to the retracted state, the third locking member switches from the disengaged position to the limiting position, and the limiting protrusion is inserted into the limiting recess to lock the second frame in the retracted state.

[0126] In one embodiment, the seat locking member has a push protrusion, and the second locking seat has a push hole disposed opposite to the push protrusion; wherein, when the second frame is in the retracted state, the drive member is adapted to be operated to push the first push part through the first drive part, thereby driving the seat locking member to move so that the push protrusion passes through the push hole and pushes the locking mechanism to switch to the first unlocking state.

[0127] In one embodiment, the first driving part is an arc-shaped protrusion centered on the pivot center of the driving member and the driving seat, and the side of the first driving part facing the first pushing member forms a first pushing slope; the first pushing part is an arc-shaped protrusion centered on the pivot center of the driving member and the driving seat, and the side of the first pushing member facing the driving member forms a second pushing slope.

[0128] In one embodiment, the second frame includes a seat and a backrest. The drive seat is connected to the backrest, and the first locking seat is connected to the seat. The drive seat is pivotally connected to the first locking seat. The locking joint is switchable between a second locked state and a second unlocked state. When the locking joint is in the second locked state, the seat and the backrest are relatively fixed to keep the second frame in use, and the seat is in a first rotational position relative to the first frame. When the locking joint is in the second unlocked state, the backrest can rotate toward the seat to switch the second frame to a folded state, at which time the seat is in a first rotational position relative to the first frame. When the second frame is switched to the folded state, the drive member can be operated to push the first push member to push the first push member through the first drive member, thereby driving the seat locking member to drive the locking mechanism to unlock. The first frame switches from an unfolded state to a folded state, and at the same time, the seat rotates relative to the locking mechanism from the first rotational position to the second rotational position.

[0129] An infant stroller includes the frame described in any of the foregoing embodiments. Attached Figure Description

[0130] Figure 1 This is an exploded view of the frame of a baby stroller according to an embodiment of the present invention;

[0131] Figure 2 for Figure 1 The diagram shows the frame in a folded state, with the seat frame in a forward-facing position.

[0132] Figure 3 for Figure 1 The diagram shows the frame in a folded state, with the seat frame in a rearward position.

[0133] Figure 4 for Figure 1 The diagram shown is a structural schematic of the vehicle frame without the seat frame.

[0134] Figure 5 for Figure 4 The diagram shows the frame structure in a folded state.

[0135] Figure 6 for Figure 4 The diagram shows a structural schematic of the vehicle frame from another perspective.

[0136] Figure 7 for Figure 6 The diagram shows a partial exploded view of the vehicle frame structure.

[0137] Figure 8 for Figure 4 The diagram shows a partial exploded view of the vehicle frame structure.

[0138] Figure 9 for Figure 4 The diagram shows the structural schematic of the rider connector in the frame section of the bicycle.

[0139] Figure 10 for Figure 9 The exploded view of the driver's connecting seat is shown below;

[0140] Figure 11 for Figure 4 A schematic diagram of the front connecting seat in the frame structure shown;

[0141] Figure 12 for Figure 11 The diagram shows the front connector from another perspective.

[0142] Figure 13 for Figure 11 The exploded view of the front connector shown;

[0143] Figure 14 for Figure 4 A schematic diagram of the rear connecting seat in the frame section shown;

[0144] Figure 15 for Figure 14 The diagram shows the structure of the rear connector from another perspective;

[0145] Figure 16 for Figure 14 The exploded view of the front connector shown;

[0146] Figure 17 for Figure 4 The diagram shown is a structural schematic of the frame section without the trim cover.

[0147] Figure 18 for Figure 17 The diagram shown is a structural schematic of the frame section in its folded state.

[0148] Figure 19 for Figure 17 The diagram shows the structural schematic of the rider connector, front connector, rear connector, and retraction linkage mechanism in the frame structure.

[0149] Figure 20 for Figure 19 The schematic diagram of the rider connector, front connector, rear connector, and retraction linkage mechanism shown from another perspective;

[0150] Figure 21 for Figure 19The structure shown omits the structural diagram after the rider connection body, front connection body and rear connection body are assembled.

[0151] Figure 22 for Figure 20 The structure shown is a schematic diagram omitting the rider connection body, front connection body and rear connection body;

[0152] Figure 23 for Figure 21 Side view of the structure shown;

[0153] Figure 24 for Figure 21 Exploded view of the structure shown;

[0154] Figure 25 for Figure 21 Another exploded view of the structure shown;

[0155] Figure 26 for Figure 21 The front view of the structure shown;

[0156] Figure 27 for Figure 26 A schematic diagram of the structure with the frame in the folded state;

[0157] Figure 28 for Figure 22 Exploded view of the structure shown;

[0158] Figure 29 for Figure 22 The front view of the structure shown;

[0159] Figure 30 for Figure 29 The diagram shown is a schematic of the structure with the frame in the folded state.

[0160] Figure 31 for Figure 17 A cross-sectional view along line AA, at which point the first locking element is in the first locking position;

[0161] Figure 32 for Figure 17 A cross-sectional view along line BB, at which point the first locking element is in the first locking position;

[0162] Figure 33 for Figure 17 A cross-sectional view along line AA, at which point the first locking element is in the first unlocking position;

[0163] Figure 34 for Figure 17 A cross-sectional view along line BB, at which point the first locking element is in the first unlocking position;

[0164] Figure 35 for Figure 17 The diagram shows a cross-sectional view of the locking mechanism and cross tube in the frame structure, with the first locking element in the first locked position.

[0165] Figure 36 for Figure 17 The diagram shows a cross-sectional view of the locking mechanism and cross tube in the frame structure, with the first locking element in the first unlocking position.

[0166] Figure 37 for Figure 17 The diagram shows the structure of the upper knob cover;

[0167] Figure 38 for Figure 17 The diagram shows the structure of the lower knob cover;

[0168] Figure 39 This is a schematic diagram of the frame of an infant stroller according to another embodiment of the present invention, in which the seat frame is in the forward position;

[0169] Figure 40 This is a schematic diagram of the frame of an infant stroller according to another embodiment of the present invention, in which the seat frame is in the rearward position;

[0170] Figure 41 for Figure 39 The diagram shown illustrates the structure of the frame during the folding process.

[0171] Figure 42 for Figure 39 The diagram shows the frame in its folded state.

[0172] Figure 43 for Figure 42 Side view;

[0173] Figure 44 for Figure 40 The diagram shown illustrates the structure of the frame during the folding process.

[0174] Figure 45 for Figure 40 The diagram shows the frame in its folded state.

[0175] Figure 46 for Figure 45 Side view;

[0176] Figure 47 for Figure 39 The diagram shown is a structural schematic of the frame omitting the seat frame, seat retainer, and cross tubes.

[0177] Figure 48 for Figure 47 A partial exploded view;

[0178] Figure 49 for Figure 48 Another exploded view of the area;

[0179] Figure 50 for Figure 47 A structural diagram from another perspective;

[0180] Figure 51 for Figure 50 A partial exploded view;

[0181] Figure 52 for Figure 50 Another exploded view of the area;

[0182] Figure 53 for Figure 47 The diagram shown is a structural schematic of the chassis without the trim cover and front connector.

[0183] Figure 54 for Figure 53 The diagram shows the frame in its folded state.

[0184] Figure 55 for Figure 39 The diagram shown is a structural schematic of the vehicle frame omitting the seat frame and seat mounting bracket.

[0185] Figure 56 for Figure 39 The diagram shows the structural diagram of the seat frame in the vehicle frame;

[0186] Figure 57 for Figure 55 A structural diagram from another perspective;

[0187] Figure 58 for Figure 57 A partial exploded view;

[0188] Figure 59 for Figure 55 The cross-sectional view shows the first locking element in the first locking position and the third locking element in the third locking position.

[0189] Figure 60 for Figure 55 Another cross-sectional view, in which the first locking member is in the first unlocking position and the third locking member is in the third unlocking position;

[0190] Figure 61 for Figure 55 An exploded view of the locking mechanism and cross tubes in the frame shown;

[0191] Figure 62 This is a schematic diagram of the frame structure shown in Figure 61 after further omitting the knob housing;

[0192] Figure 63 for Figure 55 The diagram shows a cross-sectional view of the locking mechanism and cross tube in the frame, with the first locking element in the first locked position.

[0193] Figure 64 for Figure 55 Another cross-sectional view of the locking mechanism and cross tube in the frame shown, with the first locking element in the first unlocked position;

[0194] Figure 65 This is an exploded view of the frame of the infant stroller according to another embodiment of the present invention;

[0195] Figure 66 for Figure 65 The side view of the first frame and locking mechanism in the chassis shown, with the first frame in the unfolded state;

[0196] Figure 67 for Figure 65 A sectional view along line U0-U0;

[0197] Figure 68 for Figure 65 The structure shown is a cross-sectional view along line U0-U0 with the first frame in the folded-down state.

[0198] Figure 69 for Figure 66 A partial sectional view along line U1-U1;

[0199] Figure 70 for Figure 66 The structure shown is a cross-sectional view along line U1-U1 in its folded-down state.

[0200] Figure 71 for Figure 65 An exploded view of the locking mechanism in the chassis shown.

[0201] Figure 72 for Figure 65 Another exploded view of the locking mechanism in the chassis shown;

[0202] Figure 73 for Figure 65 The side view shown shows the second frame of the vehicle frame installed behind the first frame. At this time, the first frame is in the unfolded state, the second frame is in the use state, and the seat is in the first rotating position.

[0203] Figure 74 for Figure 65 The other side view of the frame is shown, with the first frame in the unfolded state, the second frame in the folded state, and the seat in the first rotating position.

[0204] Figure 75 for Figure 65The following is another side view of the frame, in which the first frame is in the unfolded state, the second frame is in the folded state, and the seat is in the second rotation position;

[0205] Figure 76 for Figure 65 The following is another side view of the frame, in which the first frame is folded, the second frame is folded, and the seat is in the second rotating position;

[0206] Figure 77 for Figure 65 A schematic diagram of the second frame and locking joint in the chassis shown;

[0207] Figure 78 for Figure 77 A partial exploded view;

[0208] Figure 79 This is an enlarged view of the drive unit;

[0209] Figure 80 for Figure 78 Enlarged view of the pusher, seat locking member, second locking seat and engaging mechanism shown;

[0210] Figure 81 for Figure 65 A schematic diagram of the release mechanism in the frame shown, and a partial cross-sectional view of the seat frame and locking joint;

[0211] Figure 82 for Figure 73 The diagram shows a partial sectional view of the chassis along line U2-U2.

[0212] Figure 83 for Figure 74 The diagram shows a partial sectional view of the chassis along line U3-U3;

[0213] Figure 84 for Figure 75 The diagram shows a partial sectional view of the chassis along line U4-U4.

[0214] Figure 85 This is an exploded view of the frame of the infant stroller according to another embodiment of the present invention;

[0215] Figure 86 for Figure 85 A schematic diagram of the structure of the second frame of the vehicle frame shown;

[0216] Figure 87 for Figure 85 The side view of the frame shown shows the first frame in the unfolded state, the second frame in the usage state, and the seat in the first rotating position.

[0217] Figure 88 for Figure 87 The diagram shows a partial sectional view of the chassis along line U5-U5;

[0218] Figure 89 for Figure 85 The side view of the frame shown shows the first frame in the unfolded state, the second frame in the folded state, and the seat in the first rotating position.

[0219] Figure 90 for Figure 89 The diagram shows a partial sectional view of the chassis along line U6-U6;

[0220] Figure 91 for Figure 85 The diagram shows another structural schematic of the frame, in which the first frame is in a folded state, the second frame is in a closed state, and the seat is in a second rotating position;

[0221] Figure 92 for Figure 91 The diagram shows a partial sectional view of the chassis along line U7-U7;

[0222] Figure 93 for Figure 87 The exploded view of a portion of the vehicle frame is shown.

[0223] Figure 94 for Figure 87 Another exploded view of a portion of the chassis shown;

[0224] Figure 95 for Figure 93 The diagram shows the structure of the drive unit.

[0225] Figure 96 for Figure 89 The diagram shows the structural design of the vehicle frame.

[0226] Figure 97 for Figure 96 The diagram shows a partial sectional view of the chassis along line U8-U8.

[0227] Explanation of reference numerals in the attached figures

[0228] 10. Frame; 110. Handrail; 111. Push handlebar; 112. Handrail; 1121. First receiving cavity; 120. Front wheel carrier; 121. Front crossbar; 122. Front side bar; 1221. Second receiving cavity; 130. Rear wheel carrier; 131. Rear crossbar; 132. Rear side bar; 140. Seat frame; 141. Seat mounting base; 1411. First engaging part; 1412. Mating recess 300. Rider connector; 310. Rider connector body; 311. Rider pivot; 3111. First pivot hole; 3112. First locking hole; 3113. First through slot; 3113a. First end; 3113b. Second end; 3114. First mounting protrusion; 3115. Exposed slot; 3116. Mounting cylinder; 3117. Second through hole; 3118. First auxiliary locking hole 312. Rider connection part; 313. Horizontal tube mounting part; 3131. Hollow inner cavity; 314. Seat mounting part; 3141. Second engaging part; 3142. Mating protrusion; 3142a. Reinforcing rib; 320. Rider reinforcement; 321. First pivot sub-hole; 322. First locking sub-hole; 323. First through-hole; 324. First mounting hole; 400. Front connecting seat; 410. Front connecting body; 411. Front pivot part; 4111. Second pivot hole; 4112. Second locking hole; 4113. First through-hole; 4114. Second through-hole; 4114a. First end; 4114b. Second end; 4115. Third through-hole; 4116. Locking hole; 412. Front connecting part; 420. Front reinforcement; 421. Second pivot sub-hole; 422. Second locking sub-hole; 423. Secondary through-hole; 424. Secondary through-slot; 500. Rear connecting seat; 510. Rear connecting body; 511. Rear pivot part; 5111. Third pivot hole; 5112. Third locking hole; 5113. Third through-slot; 5113a. First end; 5113b. Second end; 5114. Fourth through-slot; 5114a. First end; 5114b. Second end; 5115. Limiting slot; 5116. Third mounting protrusion; 5117. Locking hole; 5118. Fifth through-slot; 5118a. First end; 5118b. Second end; 5119. Sixth through-slot; 5119a. First end; 5119b. Second end; 5110. Seventh through slot; 5110a, first end; 5110b, second end; 512, rear connecting part; 520, rear reinforcing member; 521, third pivot secondary hole; 522, third locking secondary hole; 523, third through slot; 524, fourth through slot; 525, third mounting hole; 600, retraction linkage mechanism; 610, driving member; 611, driving pin; 612, driving limit part; 620, driven member; 621, driven pin; 622, driven limit part; 630, connecting rod; 641, first driven member; 642, second driven member; 651, first connecting rod; 652, second connecting rod; 700, locking mechanism;710. First locking element; 720. First operating element, operating knob; 721. First knob cover; 722. Second knob cover; 723. Knob housing; 7231. Sleeve portion; 7231a. Sleeve cavity; 7232. Operating portion; 7232a. Operating chamber; 724. Knob drive element; 7241. Drive portion; 7241a. Drive block; 7241b. Third drive ramp; 7241c. Fourth drive ramp; 7242. Rotating portion; 725. Horizontal tube sliding element; 7251. Drive groove; 7252. First drive ramp; 7253. Second drive ramp; 726. 701. Drive protrusion; 702. Receiving cavity; 703. Drive inclined groove; 704. Second locking groove; 730. Elastic reset member; 740. Linking member; 741. Drive column; 742. Abutting boss; 704. Second strip hole; 7041. First end; 7042. Second end; 705. Insertion groove; 706. Operating hole; 750. Second locking member; 751. Locking part; 752. Push button part; 760. Fixed base; 761. First locking groove; 762. Fixed boss; 770. Auxiliary locking member; 780. Auxiliary operating member; 781. Locking member connecting part; 782. Linking part; 800, Horizontal tube; 810, First strip hole; 820, Abutment pin; 830, Long slot hole; 900, Seat fixing base; 910, Fixing base body; 911, Seat mounting part; 9111, Second engaging part; 9112, Mating protrusion; 9112a, Reinforcing rib; 912, Fixing shell part; 9120, Mounting groove; 9121, Pivot cylinder; 9121a, Fourth pivot hole; 9122, Operating groove; 9123, Second auxiliary locking hole; 913, Horizontal tube mounting cylinder; 9131, Hollow inner cavity; 9132, Sliding groove; 920, Fixing outer cover; 921, Fourth pivot auxiliary hole; 922, Mounting auxiliary hole; 101, Trim cover; 1011, Hook; 102, Pivot shaft;

[0229] A10, Frame; A100, First Frame; A110, Handrail; A111, Push Handle; A112, Handrail; A120, Front Wheel Carrier; A121, Front Crossbar; A122, Front Side Bar; A130, Rear Wheel Carrier; A131, Rear Crossbar; A132, Rear Side Bar; A140, Connecting Frame; A141, Connecting Crossbar; A142, Connecting Side Bar;

[0230] A200, Locking mechanism; A210, First connecting seat; A211, Guide rail; A211', Guide groove; A2110, Main groove section; A2111, Locking recess; A2111a, First locking recess; A2111b, Second locking recess; A212, First limiting part; A213, First connecting part; A214, First pivot part; A2141, Pivoting protrusion; A215, Rear pivot part; A220, Second connecting seat; A221, Sliding member; A2211, First abutting body; A2211a, First abutting slope; A2211b, Guide part; A2212, Locking protrusion; A222. Second limiting part; A223, second connecting part; A224, second pivot part; A2241, pivot groove; A2242, movable hole; A225, seat mounting part; A2251, movable groove; A2252, mating protrusion; A2253, first engaging part; A240, first resetting member; A250, releasing member; A251, releasing part; A252, second abutting body; A2521, second abutting slope; A253, engaging part; A254, connecting rod; A255, through hole; A260, cover; A261, first exposure hole; A262, second exposure hole; A201, first accommodating space;

[0231] A300, Second frame; A310, Backrest; A311, Backrest crossbar; A312, Backrest side bar; A3120, Receiving groove; A3121, Pushing protrusion; A320, Seat; A321, Seat crossbar; A322, Seat side bar; A323, Reinforcing bar; A330, Armrest; A340, Lock release mechanism; A341, Lock release operating component; A3411, Drive rib; A3411a, First end; A3411b, Second end; A342, Lock release drive component; A3421, Drive groove; A343, Traction component; A344, Third reset component; A345, Connecting component; A3451, Strip groove; A3452, Sliding hole;

[0232] A400, Locking joint; A410, Drive seat; A411, First pushing part; A4111, First pushing ramp; A412, Second pushing part; A4121, Second pushing ramp; A413, Back-to-back connection part; A4131, Mounting groove; A414, Back-to-back pivot part; A4140, Pivot recess; A4141, Second pivot hole; A4142, First guide hole; A4143, First pivot cylinder; A4141, Restricting protrusion; A415, Mounting protrusion; A41 6. Connecting hole; A417. Pushing edge; A4171. First edge; A4172. Second edge; A4173. Pushing recess; A420. Pushing member; A421. First abutting part; A422. Sleeving part; A423. Pushing protrusion; A424. First pushing member; A4241. First pushing part; A4244. Second pushing slope; A4242. Second pushing part; A4243. First through hole; A425. Second pushing member; A4251. Pushing column; A4252, Second through hole; A430, First locking seat; A431, First seat locking groove; A432, Seat connecting part; A433, Seat pivot part; A4330, Communicating groove; A4331, Backrest locking groove; A4332, Second guide hole; A4333, Second pivot cylinder; A4334, Third pivot hole; A434, Embedding groove; A435, Elongated groove; A436, Armrest connecting part; A4360, Cavity; A4361, Abutting post; A440. Seat locking component; A441, Second abutment portion; A4412, Third abutment slope; A442, First through hole; A443, Through hole; A444, Third through hole; A445, Push protrusion; A450, Second locking seat; A451, Second seat locking groove; A452, Pivoting protrusion; A453, Push hole; A454, Protruding ring; A455, Mating recess; A457, Receiving cavity; A458, Engaging opening; A459, Engaging groove; A4501, Fourth pivot hole; A460, Backrest locking element; A470, Second reset element; A480, Engaging mechanism; A481, Second engaging portion; A482, Disassembly operation element; A483, Fourth reset element; A490, Driving element; A491, First driving portion; A4911, First pushing slope; A492, First pivot hole; A401, Second accommodating space; A402, Closing operation element; A403, Armrest base; A404, Third locking element; A4041, Restricting recess; A4042, Through groove; A4043, Sleeving protrusion; A405, Fifth reset element;

[0233] O1, pivot axis; O2, pivot center. Detailed Implementation

[0234] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0235] like Figure 1 and Figure 2 As shown, one embodiment of the present invention provides an infant stroller, which includes a foldable frame 10 and a seat cover (not shown in the attached drawings) covering the frame 10. The frame 10 and the stroller have a simple structure, and the folded frame 10 is relatively thin. Figure 1 As shown, the frame 10 also includes a seat frame 140 suitable for carrying infants and toddlers. The seat frame 140 is detachably mounted between the two handlebars 112 or the two front side bars 122. However, the invention is not limited thereto; in one embodiment, the seat frame 140 may also be non-detachably mounted between the two handlebars 112 or the two front side bars 122. The frame 10 can be in an unfolded state (e.g., Figure 1 (as shown) and closed state (as shown) Figure 2 and Figure 3 The frame 10 can be switched between (as shown). For example, it may include a rider frame 110, a front wheel frame 120, and a rear wheel frame 130. The rider frame 110, front wheel frame 120, and rear wheel frame 130 are pivotally connected to each other and can be extended or retracted relative to each other. Specifically, as shown... Figure 1 As shown, the frame 10 is in the unfolded state, and the seat frame 140 is detached from between the two handrails 112 or the two front side rails 122. Figure 2 and Figure 3 As shown, all 10 frames are in a folded state, with the seat frame 140 having a forward-facing position (e.g., Figure 2 ) and backward position (e.g. Figure 3 These correspond to whether the infant or toddler sitting in the seat frame 140 is facing forward or backward on the direction the stroller is moving. Regardless of whether the seat frame 140 is in the forward or backward position, the frame 10 can be folded up and has a relatively thin volume when folded up.

[0236] like Figure 4 and Figure 5As shown, the rider frame 110 is generally U-shaped, including a push handle 111 located at the top and handlebars 112 connected to both ends of the push handle 111. The front wheel frame 120 is also generally U-shaped, including a front crossbar 121 located at the lower front and two front side bars 122 connected to both ends of the front crossbar 121. The rear wheel frame 130 is generally H-shaped, including a rear crossbar 131 located at the lower rear and two rear side bars 132 connected to both ends of the rear crossbar 131.

[0237] Furthermore, such as Figures 6 to 8 As shown, the frame 10 also includes a rider connector 300, a front connector 400, and a rear connector 500. The rider connector 300 is connected to the rider frame 110. The front connector 400 is connected to the front wheel frame 120. The rear connector 500 is connected to the rear wheel frame 130. Specifically, there are two rider connectors 300, two front connectors 400, and two rear connectors 500, located on the left and right sides of the frame 10, respectively. The two rider connectors 300 are connected to the bottom ends of the two handrails 112 of the rider frame 110, the two front connectors 400 are connected to the top ends of the two front side bars 122 of the front wheel frame 120, and the two rear connectors 500 are connected to the top ends of the two rear side bars 132 of the rear wheel frame 130. The rider connector 300, front connector 400 and rear connector 500 located on either side of the frame 10 are pivotally connected via pivot shaft 102, thus realizing the pivot connection of the rider frame 110, front wheel frame 120 and rear wheel frame 130.

[0238] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "front," "rear," "left," "right," "up," and "down" in this embodiment correspond to the "front," "rear," "left," "right," "up," and "down" directions when the stroller is in the unfolded state. Furthermore, the "front," "rear," "left," "right," "up," and "down" directions are schematically indicated by arrows F, B, L, R, U, and D in the figure, respectively. These directional terms are only used to make the description of the embodiments of the present invention clearer and are not intended to unduly limit the scope of protection of the present invention.

[0239] Furthermore, the frame 10 proposed in this invention also includes a retraction linkage mechanism 600 disposed between the rider connector 300, the front connector 400, and the rear connector 500. When the frame 10 switches from the unfolded state to the retracted state, the retraction linkage mechanism 600 can drive the rider connector 300, the front connector 400, and the rear connector 500 to move closer to each other and rotate to retract. By forming relevant holes and slots (which can be through holes and slots or non-through blind holes, blind slots, etc.) on the rider connector 300, the front connector 400, and the rear connector 500, which form the pivot joints of the frame 10, and by using the retraction linkage mechanism 600 passing through them, the retraction process of the entire frame 10 is faster and smoother, and the overall volume of the retracted frame 10 will be thinner and lighter than that of existing frames 10. For example, the frame 10 can be folded by a straight groove and two arc-shaped grooves provided in the rider connector 300, front connector 400, and rear connector 500, and a folding linkage mechanism 600 passing through them. Furthermore, when the frame 10 switches from the unfolded state to the folded state, one of the rider connector 300, front connector 400, and rear connector 500 moves, and the folding linkage mechanism 600 drives the other two of the rider connector 300, front connector 400, and rear connector 500 to rotate and fold together.

[0240] The following is a detailed description of one embodiment, focusing on the rider connector 300, front connector 400, rear connector 500, and retraction linkage mechanism 600 located on one side of the frame 10:

[0241] In some embodiments, such as Figure 7 and Figure 8 As shown, from the inside to the outside of the frame 10 (i.e., from the side of the frame 10 closest to the seat frame 140 to the side furthest from the seat frame 140), the rider connector 300, the front connector 400, and the rear connector 500 are pivotally connected in sequence. Of course, in other embodiments, the order of the rider connector 300, the front connector 400, and the rear connector 500 can be adjusted as needed, for example, the rear connector 500 can be positioned between the rider connector 300 and the front connector 400. A cover 101 can also be provided on the outer side of the outermost rear connector 500 to prevent the components on the rear connector 500 from causing the user to be trapped, and to make the frame 10 more aesthetically pleasing. The cover 101 is provided with multiple hooks 1011 circumferentially.

[0242] Specifically, such as Figure 9 and Figure 10As shown, the rider connector 300 includes a rider connector body 310 and a rider reinforcement 320 embedded within the rider connector body 310. Optionally, the rider reinforcement 320 can be, for example, a sheet of iron, and the rider connector body 310 can be made of, for example, plastic. The rider connector body 310 can be injection molded onto the outside of the rider reinforcement 320, for example. The rider reinforcement 320 can increase the strength of the rider connector body 310. Of course, in other embodiments, if the strength of the rider connector body 310 itself is sufficient, the rider reinforcement 320 may not be provided. The rider connector body 310 has a rider pivot portion 311 and a rider connection portion 312. The rider pivot portion 311 is generally a disc-shaped shell, and the rider connection portion 312 is a straight tubular shell extending outward from the tangential direction of the rider pivot portion 311. The rider reinforcement 320 is a sheet-like structure with a similar outer contour to the rider pivot portion 311 and the rider connection portion 312, but slightly smaller in size. In other words, the rider reinforcement 320 is embedded within the rider pivot portion 311 and the rider connection portion 312. Furthermore, the rider pivot portion 311 and the rider connection portion 312 have a communicating first mounting cavity (not shown in the attached drawings), and the rider reinforcement 320 is disposed within this first mounting cavity.

[0243] Please see also Figure 7 and Figure 8 The handrail 112 has a hollow first receiving cavity 1121 at at least its bottom end. At least a portion of the handrail connector 312 and at least a portion of the handrail reinforcement 320 are inserted into the first receiving cavity 1121 to connect the handrail connector 300 to the handrail 110. Please refer to [further details omitted]. Figure 10The outer housing of the driver's pivot 311, that is, the side housing facing the front connecting seat 400, has a first pivot hole 3111 at approximately its center for the pivot shaft 102 to pass through. A corresponding first pivot secondary hole 321 is also provided on the driver's reinforcing member 320. Off-center on the outer housing of the driver's pivot 311, a first locking hole 3112 is provided for the first locking member 710 (see below) to pass through. Similarly, a corresponding first locking secondary hole 322 is provided on the driver's reinforcing member 320. The outer housing of the driver's pivot 311 also has an exposure groove 3115 offset from the first pivot hole 3111, which communicates with the first mounting cavity. The inner housing of the driver's pivot 311 has a first through-slot 3113 on the side facing the first mounting cavity for the drive member 610 (see below) to pass through. Specifically, the first through-groove 3113 can be an arc-shaped groove with its center offset from the first pivot hole 3111. A corresponding first through-groove sub-groove 323 with a similar shape to the first through-groove 3113 is also provided on the rider reinforcement 320. Both the first through-groove 3113 and the first through-groove sub-groove 323 are exposed through the exposure groove 3115. Further, the inner housing of the rider pivot 311 has a first mounting protrusion 3114 on the side facing the first mounting cavity, and a corresponding first mounting hole 324 is provided on the rider reinforcement 320. The first mounting protrusion 3114 is inserted into the first mounting hole 324 to further fix the rider reinforcement 320 within the rider connector 300. Optionally, there are two first mounting protrusions 3114 and two corresponding first mounting holes 324. Alternatively, the number of first mounting protrusions 3114 and first mounting holes 324 can be adjusted as needed. The first mounting protrusion 3114 and the first mounting hole 324 are exposed via the exposure groove 3115. In some embodiments, the first mounting protrusion 3114 and the first mounting hole 324 may also be hidden within the driver's pivot portion 311.

[0244] Furthermore, such as Figure 9 and Figure 10 As shown, the rider connector 300 also includes a cross tube mounting portion 313 for mounting the cross tube 800 (see below for details). The cross tube mounting portion 313 is generally cylindrical in shape and extends from the inner housing of the rider pivot portion 311 in a direction generally perpendicular to the rider pivot portion 311, i.e., in the lateral direction. The cross tube mounting portion 313 has a hollow inner cavity 3131, which communicates with the first locking hole 3112 and the first locking secondary hole 322. The cross tube mounting portions 313 of the two rider connectors 300 located on the left and right sides of the frame 10 are arranged opposite each other, and the two ends of the cross tube 800 are respectively inserted into the hollow inner cavities 3131 of the two cross tube mounting portions 313.

[0245] Furthermore, such as Figure 9 and Figure 10As shown, the rider connector 300 also includes a seat mounting portion 314, which is disposed on the inner housing of the rider pivot portion 311 and the rider connector portion 312. The seat mounting portion 314 is generally located above the cross tube mounting portion 313, and is generally arranged in a vertical direction perpendicular to the ground, that is, the seat mounting portion 314 is generally perpendicular to the cross tube mounting portion 313. The seat mounting portion 314 is provided with a first engaging portion 1411 (e.g., ...). Figure 1 (As shown) The second engaging part 3141 engages with the other part. Please also refer to... Figure 1 The seat frame 140 has seat mounting seats 141 on both its left and right sides, and each seat mounting seat 141 is provided with a first engaging portion 1411. The first engaging portion 1411 is an engaging hook, and the second engaging portion 3141 is an engaging groove that can engage with the first engaging portion 1411. However, the arrangement of the first engaging portion 1411 and the second engaging portion 3141 is not limited to this. In one embodiment, the arrangement of the first engaging portion 1411 and the second engaging portion 3141 can also be reversed, that is, the first engaging portion 1411 is an engaging groove, and the second engaging portion 3141 is an engaging hook that can engage with it, or it can be other types of engaging structures. In one embodiment, the seat mounting portion 314 can also be provided with a mating protrusion 3142, and the seat mounting seat 141 is provided with a mating recess 1412 that can engage with the mating protrusion 3142, so as to enhance the installation firmness between the seat frame 140 and the driver's connecting seat 300. The mating protrusion 3142 is generally arranged along the extending direction of the seat mounting portion 314. Furthermore, in one embodiment, the mating protrusion 3142 is also provided with intersecting reinforcing ribs 3142a to enhance its structural strength. Of course, in one embodiment, the arrangement of the mating protrusion 3142 and the mating recess 1412 can also be reversed; that is, the seat mounting portion 314 is provided with a mating recess 1412, and the seat mounting base 141 is provided with a mating protrusion 3142 that mates with the mating recess 1412.

[0246] The rider connector 300 can achieve multiple functions such as connecting and pivoting the rider frame 110, installing the seat frame 140, and installing the cross tube 800 through a single component. This greatly simplifies the components of the frame 10, facilitates production and assembly, and also helps to make the frame 10 have a thin and light volume when folded.

[0247] Specifically, such as Figures 11 to 13As shown, the front connector 400 includes a front connector body 410 and a front reinforcing member 420 embedded within the front connector body 410. Optionally, the front reinforcing member 420 may be, for example, an iron sheet, and the front connector body 410 may be made of, for example, plastic. The front connector body 410 may be injection molded onto the front reinforcing member 420, for example. The front reinforcing member 420 can increase the strength of the front connector body 410. Of course, in other embodiments, if the strength of the front connector body 410 itself is sufficient, the front reinforcing member 420 may not be provided. The front connector body 410 has a front pivot portion 411 and a front connecting portion 412. The front pivot portion 411 is generally a disc-shaped shell, and the front connecting portion 412 is a straight tubular shell extending outward from the tangential direction of the front pivot portion 411. The front reinforcing member 420 is a sheet-like structure with a size slightly smaller than that of the front pivot portion 411 and the front connecting portion 412, meaning that the front reinforcing member 420 is embedded within the front pivot portion 411 and the front connecting portion 412. In other words, the front pivot portion 411 and the front connecting portion 412 have a communicating second mounting cavity (not shown), and the front reinforcing member 420 is disposed within this second mounting cavity. Please refer to [further details omitted]. Figure 7 and Figure 8 The front rod 122 has a hollow second receiving cavity 1221 at least at its top end. At least a portion of the front connecting part 412 and at least a portion of the front reinforcing member 420 are inserted into the second receiving cavity 1221 to achieve the connection between the front connecting seat 400 and the front wheel frame 120.

[0248] Please see also Figures 11 to 13The front pivot portion 411 has a second pivot hole 4111 penetrating its housing structure at approximately its center, which is suitable for the pivot shaft 102 to pass through. A corresponding second pivot auxiliary hole 421 is also provided on the front reinforcing member 420. A second locking hole 4112 penetrating its housing structure is provided off-center from the front pivot portion 411, which is suitable for the first locking member 710 (see below) to pass through. A corresponding second locking auxiliary hole 422 is also provided on the front reinforcing member 420. Furthermore, the front pivot portion 411 also has a first through hole 4113 penetrating its housing structure off-center from the front pivot portion 411, which is suitable for the driven member 620 (see below) to pass through. The first through hole 4113 is approximately a circular hole with a diameter equal to or slightly larger than the radial dimension of the driven member 620 (see below). The first through hole 4113 is closer to the second pivot hole 4111 than the second locking hole 4112. However, the invention is not limited thereto. In one embodiment, the positions of the first through hole 4113 and the second locking hole 4112 can be reversed, that is, the first through hole 4113 is farther away from the second pivot hole 4111 than the second locking hole 4112. A secondary through hole 423 is also provided on the front reinforcing member 420 at a position corresponding to the first through hole 4113. Further, the front pivot portion 411 is also provided with a second through groove 4114 penetrating its housing structure. The second through groove 4114 is an arc-shaped groove with its center offset from the second pivot hole 4111. In this embodiment, the second through groove 4114 is an arc-shaped groove with the first through hole 4113 as its center. The second through groove 4114 is suitable for the drive member 610 (see below) to pass through. A second secondary through groove 424 of similar shape is also provided at a corresponding position on the front reinforcing member 420.

[0249] Specifically, such as Figures 14 to 16As shown, the rear connector 500 includes a rear connector body 510 and a rear reinforcing member 520 embedded within the rear connector body 510. Optionally, the rear reinforcing member 520 may be, for example, a sheet of iron, and the rear connector body 510 may be made of, for example, plastic. The rear connector body 510 may be injection molded onto the rear reinforcing member 520, for example. The rear reinforcing member 520 can increase the strength of the rear connector body 510. In an alternative embodiment, if the strength of the rear connector body 510 itself is sufficient, the rear reinforcing member 520 may not be provided. The rear connector body 510 has a rear pivot portion 511 and a rear connector portion 512. The rear pivot portion 511 is generally a disc-shaped shell, and the rear connector portion 512 is a straight tubular shell extending outward in a generally radial direction from the rear pivot portion 511. The rear reinforcement 520 is a sheet-like structure with a size slightly smaller than that of the rear pivot portion 511 and the rear connecting portion 512, meaning that the rear reinforcement 520 is embedded within the rear pivot portion 511 and the rear connecting portion 512. In other words, the rear pivot portion 511 and the rear connecting portion 512 have a communicating third mounting cavity (not shown in the attached drawings), and the rear reinforcement 520 is disposed within this third mounting cavity. Please refer to [further details omitted]. Figure 7 and Figure 8 The rear rod 132 has a hollow third receiving cavity (not shown in the figure) at least at its top end. At least a portion of the rear connecting part 512 and at least a portion of the rear reinforcing member 520 are inserted into the third receiving cavity to realize the connection between the rear connecting seat 500 and the rear wheel frame 130.

[0250] Please continue reading Figures 14 to 16The rear pivot portion 511 has a third pivot hole 5111 penetrating its housing structure at approximately its center, which is suitable for the pivot shaft 102 to pass through. A corresponding third pivot secondary hole 521 is also provided on the rear reinforcing member 520. A third locking hole 5112 penetrating its housing structure is provided off-center from the rear pivot portion 511, which is suitable for the first locking member 710 (see below) to pass through. A corresponding third locking secondary hole 522 is also provided on the rear reinforcing member 520. The inner housing of the rear pivot portion 511, i.e., the side of the rear pivot portion 511 facing the front pivot portion 411, has a third through groove 5113, which is a straight groove offset from the third pivot hole 5111. The third through groove 5113 is suitable for the driving member 610 (see below) to pass through. A similarly shaped third through-slot 523 is also provided at a corresponding position on the rear reinforcing member 520. Furthermore, the inner housing of the rear pivot portion 511 is also provided with a fourth through-slot 5114, which is approximately an arc-shaped groove centered on the third pivot hole 5111. The fourth through-slot 5114 is used for the driven member 620 (see below) to pass through. A similarly shaped fourth through-slot 524 is also provided at a corresponding position on the rear reinforcing member 520. Furthermore, the outer housing of the rear pivot portion 511, i.e., the housing on the side of the rear pivot portion 511 facing the cover 101, is provided with a limiting groove 5115, through which the third through-slot 5113, the third through-slot 523, the fourth through-slot 5114, and the fourth through-slot 524 are all exposed. Furthermore, the outer shell of the rear pivot portion 511 facing the third mounting cavity is provided with a third mounting protrusion 5116, and the corresponding position of the rear reinforcing member 520 is provided with a third mounting hole 525. The third mounting protrusion 5116 is inserted into the third mounting hole 525 to further fix the rear reinforcing member 520 in the rear connecting seat 500. Optionally, there are two third mounting protrusions 5116 and three mounting holes 525, and they correspond one-to-one. However, the present invention is not limited thereto, and the number of third mounting protrusions 5116 and third mounting holes 525 can be adjusted as needed. The third mounting protrusions 5116 and third mounting holes 525 are exposed through the limiting groove 5115. However, the present invention is not limited thereto, and in one embodiment, the third mounting protrusions 5116 and third mounting holes 525 can also be hidden in the rear pivot portion 511. Furthermore, a plurality of locking holes 5117 are provided at the circumferential edge of the rear pivot portion 511 (see Figure 7 or Figure 8 Multiple slots 5117 and multiple hooks 1011 are engaged one-to-one to enable the installation of the cover 101 on the rear pivot 511.

[0251] Specifically, such as Figures 18 to 20 As shown, the retraction linkage mechanism 600 includes a drive component 610. The drive component 610 includes a drive limiting part 612 and a drive pin 611 connected to each other (see...). Figure 22and Figure 23 The radial dimension of the drive limiting part 612 is larger than the radial dimension of the drive pin 611. The drive component 610 is a one-piece molded structure. However, the present invention is not limited thereto; for example, the drive component 610 may also be composed of mutually independent drive limiting parts 612 and drive pins 611 connected by means of fusion or welding. Figures 21 to 24 As shown, the third through groove 5113 of the rear pivot 511, the second through groove 4114 of the front pivot 411, and the first through groove 3113 of the rider pivot 311 at least partially overlap. One end of the drive pin 611 away from the drive limiting portion 612 passes sequentially through the third through groove 5113, the second through groove 4114, and the first through groove 3113. Referring to the corresponding grooves on the rear reinforcement 520, the front reinforcement 420, and the rider reinforcement 320, it can be said that one end of the drive pin 611 away from the drive limiting portion 612 passes sequentially through the third through groove 523, the second through groove 424, and the first through groove 323. The drive limiting portion 612 of the drive member 610 is limited to the side of the first through groove 3113 facing the cover 101, thus preventing the drive member 610 from slipping.

[0252] To clearly illustrate the relationship between the driving member 610 and the driven member 620 (mentioned below) and the first through slot 3113, the second through slot 4114 and the third through slot 5113, Figures 21 to 28 The rider connection body 310, front connection body 410, and rear connection body 510 are omitted; only the rider reinforcement 320, front reinforcement 420, and rear reinforcement 520 are shown. It should be understood that since the positions and shapes of the first through-slot 3113, second through-slot 4114, and third through-slot 5113 correspond to the first through-sub-slot 323, second through-sub-slot 424, and third through-sub-slot 523, the relationship between the shown drive member 610 and the driven member 620 (mentioned below) and the first through-sub-slot 323, second through-sub-slot 424, and third through-sub-slot 523 is equivalent to the relationship between the drive member 610 and the driven member 620 (mentioned below) and the first through-slot 3113, second through-slot 4114, and third through-slot 5113. For ease of description, the first through slot 3113, the second through slot 4114, and the third through slot 5113 will be used to refer to the first through slot 323, the second through slot 424, and the third through slot 523, respectively.

[0253] like Figures 24 to 27As shown, the drive member 610 passes through the third through groove 5113, the second through groove 4114, and the first through groove 3113. The first through groove 3113 is recessed towards the first pivot hole 3111, and the third through groove 5113 is recessed towards the third pivot hole 5111. That is, the recessed side of the first through groove 3113 faces the first pivot hole 3111, and the recessed side of the third through groove 5113 faces the third pivot hole 5111. Alternatively, it can be understood that the first through groove 3113 and the second through groove 4114 are recessed towards the pivot axis 102. The projection of the third through groove 5113 along the direction parallel to the pivot axis 102 is always located between the projections of the first through groove 3113 and the second through groove 4114 along the direction parallel to the pivot axis 102. The first through slot 3113 has a first end 3113a away from the rider connection portion 312 and a second end 3113b near the rider connection portion 312. The second through slot 4114 has a first end 4114a away from the front connection portion 412 and a second end 4114b near the front connection portion 412. The third through slot 5113 has a first end 5113a near the third pivot hole 5111 and a second end 5114b away from the third pivot hole 5111. Alternatively, the first through slot 3113 has a first end 3113a away from the first pivot hole 3111 and a second end 3113b near the first pivot hole 3111. The second through slot 4114 has a first end 4114a away from the second pivot hole 4111 and a second end 4114b near the second pivot hole 4111. When the frame 10 is in the unfolded state, as Figure 26 and Figure 29 As shown, the drive pin 611 of the drive member 610 is located at the first end 5113a of the third through slot 5113, the second end 4114b of the second through slot 4114, and the second end 3113b of the first through slot 3113. When the frame 10 is in the retracted state, as... Figure 27 and Figure 30 As shown, the drive pin 611 of the drive member 610 is located at the second end 5113b of the third through groove 5113, the first end 4114a of the second through groove 4114, and the first end 3113a of the first through groove 3113.

[0254] Please see also Figure 17 and Figure 18 When the first locking member 710 releases the lock on the frame 10 in the unfolded state (see below for details), the first operating member 720 or the cross tube 800 can be operated, causing the rider frame 110 to move along... Figure 17 As shown, when the rider's frame 110 rotates in the R1 direction, it causes the rider's connecting seat 300 to rotate and retract in the R1 direction. At this time, the rider's pivot part 311 of the rider's connecting seat 300 also rotates in the R1 direction. Figure 17 The R1 direction is rotated, thereby driving the drive pin 611 inserted in the first through slot 3113 upward (i.e. Figure 21Move in the D1 direction (as shown in the image). Please also refer to... Figure 21 , Figure 22 and Figure 27 The drive pin 611 moves from the first end 5113a to the second end 5113b within the third through slot 5113. Simultaneously, the drive pin 611, through its engagement with the second through slot 4114, drives the front connecting seat 400 to rotate in the opposite direction of the rear connecting seat 500 along the R1 direction, thereby causing the rear wheel frame 130 to retract into the front wheel frame 120. At the same time, the rotation of the rider connecting seat 300 also drives the seat frame 140 mounted thereon to rotate. In this way, the entire frame 10 can be retracted. The retraction linkage mechanism 600 has a simple structure and is easy to manufacture and assemble. Since no additional retraction mechanism is required, the retraction is achieved by forming relevant holes and slots on the rider connecting seat 300, the front connecting seat 400, and the rear connecting seat 500, which form the pivot joints of the frame 10, and by using the drive member 610 during the through-hole operation. The overall volume of the retracted frame 10 will be thinner and lighter than existing frames.

[0255] Furthermore, such as Figure 17 and Figure 18 As shown, the retraction linkage mechanism 600 also includes a driven member 620 and a connecting rod 630. The driven member 620 passes through the rear connecting seat 500 and the front connecting seat 400, and is spaced apart from the pivot shaft 102 and the driving member 610. Specifically, the driven member 620 includes a driven limiting part 622 and a driven pin 621 connected to each other (see...). Figure 23 The radial dimension of the driven limiting portion 622 is larger than the radial dimension of the driven pin 621. The driven member 620 is a one-piece molded structure. However, the present invention is not limited thereto; for example, the driven member 620 may also be formed by connecting the independent driven limiting portion 622 and the driven pin 621 through welding or other methods. Figures 23 to 26 As shown, the first through hole 4113 of the front pivot portion 411 and the fourth through slot 5114 of the rear pivot portion 511 (see...) Figure 18 At least partially overlapping. The end of the driven pin 621 away from the driven limiting portion 622 passes sequentially through the fourth through groove 5114 and the first through hole 4113. If the corresponding grooves on the rear reinforcement 520 and the front reinforcement 420 are taken as references, it can be said that the end of the driven pin 621 away from the driven limiting portion 622 passes sequentially through the fourth through auxiliary groove 524 and the through auxiliary hole 423. The driven limiting portion 622 of the driven member 620 is limited to the side of the fourth through groove 5114 facing the cover 101, thus preventing the driven member 620 from slipping. The connecting rod 630 can be, for example, an arc-shaped rod. The connecting rod 630 is located in the limiting groove 5115 and on the side of the rear reinforcement 520 facing the cover 101. The two ends of the connecting rod 630 are connected to the driven member 620 and the driving member 610, respectively. When the frame 10 is in the unfolded state, such as Figure 17As shown, the linkage 630 abuts against one side wall of the limiting groove 5115. When the frame 10 is in the retracted state, as... Figure 18 As shown, the linkage 630 abuts against the other side wall of the limiting groove 5115. One side wall of the limiting groove 5115 is closer to the third pivot hole 5111 than the other side wall of the limiting groove 5115. Both the one side wall and the other side wall of the limiting groove 5115 are arc-shaped groove walls adapted to the linkage 630. The first through hole 4113 is approximately a circular hole with a diameter equal to or slightly larger than the radial dimension of the follower pin 621. The fourth through groove 5114 is located on one side of the third through groove 5113. The fourth through groove 5114 has a first end 5114a near the third through groove 5113 and a second end 5114b away from the third through groove 5113. When the frame 10 is in the unfolded state, as Figure 17 As shown, the follower 620 is located at the second end 5114b of the fourth through slot 5114 (the fourth through slot 5114 is blocked by the linkage 630). When the frame 10 is in the retracted state, as... Figure 18 As shown, the follower 620 is located at the first end 5114a of the fourth through slot 5114.

[0256] Please see also Figure 17 and Figure 1 When the first locking member 710 releases the frame 10 in the unfolded state (see below for details), the first operating member 720 or the cross tube 800 is operated, causing the rider connecting seat 300 to rotate. Through the cooperation of the driving member 610 with the first through slot 3113, the second through slot 4114 and the third through slot 5113, the front connecting seat 400 is rotated and retracted to the rear connecting seat 500. During this process, the driving member 610 moves along the third through slot 5113 from the first end 5113a to the second end 5113b, while the driving member 610 drives the driven member 620 to move from the second end 5114b to the first end 5114a in the fourth through slot 5114 through the linkage rod 630. The center of the fourth through slot 5114 coincides with the pivot shaft 102 (i.e., the third pivot hole 5111). The trajectory direction from the second end 5114b to the first end 5114a of the fourth through slot 5114 is the same as the opposite direction of the R1 direction. Therefore, the follower 620 also drives the front connecting seat 400 along the first through hole 4113 through its cooperation with the first through hole 4113. Figure 21 The frame 10 retracts by rotating in the opposite direction of R1. Thus, by providing the driven member 620 and the connecting rod 630, the front connecting seat 400 and the rear connecting seat 500 can be further driven to rotate closer to each other, making the retraction process of the frame 10 faster and smoother, and reducing the thickness of the frame 10 after retraction. Of course, in other embodiments, the driven member 620 and the connecting rod 630 can also be omitted.

[0257] Furthermore, the frame 10 may also include a locking mechanism 700. The locking mechanism 700 is disposed between the rider connector 300, the front connector 400, and the rear connector 500. The locking mechanism 700 is switchable between a locked state and an unlocked state. When the locking mechanism 700 is in the locked state, the frame 10 is locked in either an extended or retracted state. When the locking mechanism 700 is in the unlocked state, the frame 10 is switchable between the extended and retracted states. The locking mechanism 700 can have various forms:

[0258] like Figures 31 to 34 As shown, in this embodiment, the locking mechanism 700 may include, for example, a first locking member 710, which has a pin-like structure. There are two first locking members 710, each adapted to lock the rider connector 300, front connector 400, and rear connector 500 located on the left and right sides of the frame 10, respectively. Taking one side of the first locking member 710 as an example, the first locking member 710 is at least partially disposed within the cross tube 800. The first locking member 710 can switch between a first locking position and a second locking position. In one embodiment, when the first locking member 710 is in the first locking position, as shown... Figure 31 and Figure 32 As shown, one end of the first locking member 710 passes through the first locking hole 3112, the second locking hole 4112, and the third locking hole 5112, locking the frame 10 in the unfolded position. When the first locking member 710 is in the first unlocked position, as... Figure 33 and Figure 34 As shown, one end of the first locking member 710 exits the third locking hole 5112, the second locking hole 4112 and the first locking hole 3112 and retracts into the horizontal tube 800, so that the frame 10 can be folded.

[0259] Furthermore, such as Figure 35 and 36 As shown, the locking mechanism 700 may further include a first operating member 720, a linkage member 740, and an elastic reset member 730. There are two linkage members 740 and two elastic reset members 730, respectively located on the left and right sides within the horizontal tube 800. There is one first operating member 720, rotatably fitted onto the outside of the horizontal tube 800. The first operating member 720 is drivenly connected to two driven members 740. Specifically, the first operating member 720 is an operating knob 720. The operating knob 720 can take various forms; for example, it may include a first knob cover 721 and a second knob cover 722 that interlock. The first knob cover 721 and the second knob cover 722 enclose a hollow receiving cavity. The horizontal tube 800 at least partially passes through this receiving cavity 701; in other words, the operating knob 720 is fitted onto the outside of the horizontal tube 800. Figure 37 and Figure 38As shown, a drive groove 702 is provided on the first knob cover 721 or the second knob cover 722. There are two drive grooves 702, which are close to each other along the direction in which the operating knob 720 can be rotated.

[0260] The locking mechanism 700 will be described in detail below using the components on the side of the operating knob 720:

[0261] like Figure 35 and Figure 36 As shown, the linkage 740 is generally a straight rod-shaped structure. One end of the linkage 740 is fixedly connected to the first locking member 710, and the other end is drivenly connected to the first operating member 720. Specifically, one end of the linkage 740 is provided with a drive post 741. The wall of the horizontal tube 800 is provided with a first strip hole 810 that communicates with the receiving cavity 701 of the operating knob 720. The drive post 741 passes through the first strip hole 810, exits the horizontal tube 800, enters the receiving cavity 701, and is inserted into the drive inclined groove 702 (see...). Figure 37 and Figure 38 When the operating knob 720 is rotated, the operating knob 720 can drive the linkage 740 away from the same side of the same-side driver's connecting seat 300 (or front connecting seat 400 or rear connecting seat 500) through the cooperation of the drive slant groove 702 and the drive column 741 (i.e. Figure 31 and Figure 32 The movement is in the D2 direction. In other words, when the operating knob 720 is rotated, the operating knob 720 can drive the two linkages 740 to move towards each other through the cooperation of the drive groove 702 and the drive column 741. The other end of the linkage 740 is fixedly connected to the first locking member 710. Specifically, the other end of the linkage 740 is provided with an insertion groove 705 extending along its length direction, and one end of the first locking member 710 is inserted and fixed in the insertion groove 705.

[0262] like Figure 35 and Figure 36As shown, the elastic reset member 730 is adapted to apply force to the first locking member 710 to move it to the first locked position. Both ends of the elastic reset member 730 abut against the linkage member 740 and the horizontal tube 800, respectively. The elastic reset member 730 is adapted to push the linkage member 740 to move, causing the linkage member 740 to drive the first locking member 710 to move to the first locked position. Specifically, a circumferentially arranged abutment boss 742 is formed on the side wall of the linkage member 740. The linkage member 740 also has a second slotted hole 704. The second slotted hole 704 is located at the end of the abutment boss 742 away from the first locking member 710, that is, the second slotted hole 704 is located in the D2 direction of the abutment boss 742. An abutment pin 820 is also protruding from the inner side wall of the horizontal tube 800, and the abutment pin 820 is inserted into the second slotted hole 704. The elastic reset member 730 can be a spring. The elastic reset member 730 can also be, for example, a spring sheet. The elastic reset member 730 is sleeved outside the linkage member 740, with one end abutting against the abutting boss 742 and the other end abutting against the abutting pin 820. The elastic reset member 730 applies force to the linkage member 740 to move the first locking member 710 to the first locked position. The second slot 704 has a first end 7041 away from the first locking member 710 and a second end 7042 close to the first locking member 710. When the first operating member 720 is not operated, the elastic reset member 730 pushes the linkage member 740 to move the first locking member 710 in the opposite direction of the D2 direction to the first locked position, so that the abutting pin 820 is located at the first end 7041 of the second slot 704. When the first operating member 720 is operated, the linkage member 740 moves in the D2 direction and drives the first locking member 710 to the first unlocking position. At this time, the abutment pin 820 is located at the second end 7042 of the second strip hole 704, and the elastic reset member 730 is compressed and deformed.

[0263] In some embodiments not shown, the locking mechanism 700 may also omit the linkage 740, directly driving the first operating member 720 and the first locking member 710 together. For example, a drive post 741 may be directly provided on the first locking member 710 to cooperate with the drive groove 702 of the first operating member 720, or the first locking member 710 and the linkage 740 may be directly integrally formed as components. The present invention does not limit this.

[0264] Furthermore, such as Figure 35 and Figure 36 As shown, the locking mechanism 700 may further include a second locking element 750. The second locking element 750 serves as a second safety lock; only when the second locking element 750 is released can the first operating element 720 be released to drive the first locking element 710 to move to the first released position, thereby closing the frame 10. This prevents accidental activation of the first operating element 720, thus preventing the frame 10 from closing unintentionally and improving the safety of the stroller. Figure 35 and Figure 36 As shown, the second locking member 750 is movably disposed on the first operating member 720 and is movable between a second locked position and a second unlocked position. The second locking member 750 includes a locking part 751 and a push button part 752. The second locking member 750 is a one-piece molded component. However, the present invention is not limited thereto, and the second locking member 750 may also be formed by welding or fusion of two independent components, the locking part 751 and the push button part 752.

[0265] Specifically, such as Figure 35 and Figure 36 As shown, the locking mechanism 700 may further include a fixing seat 760 circumferentially fixed to the outside of the horizontal tube 800. Optionally, there may be two fixing seats 760, respectively disposed at both ends of the first operating member 720. Both fixing seats 760 are generally cylindrical in shape, and the inner sidewalls of both fixing seats 760 protrude towards each other along their axial direction to form fixing bosses 762 surrounding the horizontal tube 800. Both fixing bosses 762 are inserted into the receiving cavity 701 of the operating knob 720, so that the operating knob 720 can rotate around the fixing seat 760. One of the fixing seats 760 is provided with a first locking groove 761, and the first knob cover 721 or the second knob cover 722 of the operating knob 720 has a second locking groove 703, and the first locking groove 761 and the second locking groove 703 are connected. When the second locking member 750 is in the second locked position, a portion of the second locking member 750 is located in the first locking groove 761, and the other portion is located in the second locking groove 703, and the operating knob 720 cannot be rotated. When the second locking member 750 is in the second unlocked position, the second locking member 750 retracts from the first locking groove 761 or the second locking groove 703, and the operating knob 720 can be rotated. In this embodiment, when the second locking member 750 is in the second unlocked position, the second locking member 750 retracts from the first locking groove 761. The first knob cover 721 or the second knob cover 722 is also provided with an operating hole 706 communicating with the second locking groove 703, and the push button portion 752 of the second locking member 750 is exposed through the operating hole 706 for operation. The locking mechanism 700 may also include an elastic reset member (not shown in the figure), which applies force to the second locking member 750 to move the second locking member 750 to the second locked position.

[0266] The operating principle of the locking mechanism 700 in one embodiment is explained in detail below:

[0267] like Figure 31 and Figure 32As shown, when the locking mechanism 700 needs to be released to retract the frame 10, the second locking member 750 can be pushed in the D2 direction, causing the second locking member 750 to move from the second locked position to the second unlocked position, that is, the second locking member 750 disengages from the first locking groove 761. At this time, the operating knob 720 can be rotated. The operating knob 720 drives the linkage 740 to move in the D2 direction through the cooperation of the drive groove 702 and the drive column 741. The linkage 740 then drives the first locking member 710 to move from the first locked position to the first unlocked position. At this time, the elastic reset member 730 is compressed and deformed, and the first locking member 710 disengages sequentially from the third locking hole 5112, the second locking hole 4112 and the first locking hole 3112, thereby releasing the locking mechanism 700 from locking the frame 10 in the unfolded position, so that the frame 10 can be retracted.

[0268] like Figure 33 and Figure 34 As shown, when the locking mechanism 700 needs to be locked, the force applied to the second locking member 750 and the operating knob 720 is released. The linkage 740, having lost its driving force from the operating knob 720, moves in the opposite direction of the D1 direction under the elastic restoring force of the elastic reset member 730. Simultaneously, the operating knob 720 is reset through the cooperation of the drive groove 702 and the drive column 741. During the movement of the linkage 740, the first locking member 710 moves from the first unlocking position to the first locking position. The first locking member 710 inserts into the first locking hole 3112, the second locking hole 4112, and the third locking hole 5112, thereby locking the frame 10 in the unfolded position.

[0269] like Figure 39 and Figure 40 As shown, another embodiment of the present invention provides an infant stroller, which also includes a foldable frame 10 and a seat cover (not shown in the figures) covering the frame 10. Similar to the previous embodiment, the frame 10 in this embodiment also includes a handlebar frame 110, a front wheel frame 120, a rear wheel frame 130, and a seat frame 140, and the structure and connection relationship of the above components are basically the same as in the first embodiment, and will not be repeated here. Figure 39 and Figure 40 As shown, the seat frame 140 also has a forward position and a rearward position. Regardless of whether the seat frame 140 is in the forward position (e.g., Figures 41 to 43 (as shown) or backward position (such as) Figures 44 to 46 As shown), the frame 10 can be easily folded directly and has a relatively thin volume when folded, without removing the seat frame 140. When the seat frame 140 in the frame 10 is removed, the remaining part of the frame 10 can also be easily folded. Specifically, as shown... Figure 39As shown, the frame 10 is in the unfolded state, the seat frame 140 is in a forward position, and the seat frame 140 is unfolded and mounted between the two handrails 112 or the two front side rails 122. Figure 41 As shown, the seat frame 140 in the forward position is folded down, as... Figure 42 and 43 As shown, all 10 frames are in the retracted state. Figure 40 As shown, the frame 10 is in the unfolded state, the seat frame 140 has a rearward position, and the seat frame 140 is unfolded and installed between the two handrails 112 or the two front side rails 122. Figure 44 As shown, the seat frame 140 in the rearward position is folded down, as... Figure 45 and 46 As shown, the frame 10 is in the folded state. Regardless of whether the seat frame 140 is in the forward or rearward position, the frame 10 can be folded and has a thinner volume when folded.

[0270] like Figure 49 and Figure 50 As shown, the frame 10 in this embodiment also includes a rider connector 300, a front connector 400, and a rear connector 500. Similar to the first embodiment, the rider connector 300 is connected to the rider frame 110. The front connector 400 is connected to the front wheel frame 120. The rear connector 500 is connected to the rear wheel frame 130. Specifically, there are two rider connectors 300, two front connectors 400, and two rear connectors 500, located on the left and right sides of the frame 10, respectively. The two rider connectors 300 are connected to the bottom ends of the two handrails 112 of the rider frame 110, the two front connectors 400 are connected to the top ends of the two front side bars 122 of the front wheel frame 120, and the two rear connectors 500 are connected to the top ends of the two rear side bars 132 of the rear wheel frame 130. The rider connector 300, front connector 400, and rear connector 500, located on either side of the frame 10, are pivotally connected via a pivot shaft 102, thus achieving the pivotal connection of the rider frame 110, front wheel frame 120, and rear wheel frame 130. The relative positions and detailed structures of the rider connector 300, front connector 400, and rear connector 500 in this embodiment differ somewhat from those in the first embodiment. The following description focuses on the rider connector 300, front connector 400, and rear connector 500 located on one side of the frame 10:

[0271] like Figures 47 to 49As shown, the structure and connection relationship of the rider connector 300, rear connector 500, front connector 400, and retraction linkage mechanism 600 can be configured as follows: from the inside to the outside of the frame 10 (i.e., from the side of the frame 10 closest to the seat frame 140 to the side furthest from the seat frame 140), the rider connector 300, rear connector 500, and front connector 400 are pivotally connected in sequence. A cover 101 can also be provided on the outer side of the outermost front connector 400 to avoid the risk of parts on the front connector 400 causing the user to be trapped, and to make the frame 10 more aesthetically pleasing. The cover 101 is provided with multiple hooks 1011 circumferentially.

[0272] Specifically, such as Figure 48 and Figure 49 As shown, the front connector 400 includes a front connector body 410 and a front reinforcing member embedded in the front connector body 410. Figure 48 and Figure 49 (Not shown). The front connecting body 410 has a front pivot portion 411 and a front connecting portion 412. The front pivot portion 411 is a generally disc-shaped housing, and the front connecting portion 412 is a straight tubular housing extending outward in the tangential direction of the front pivot portion 411. The front side rod 122 has a hollow second receiving cavity 1221 at least at its top end (see...). Figure 52 At least a portion of the front connecting portion 412 and at least a portion of the front reinforcing member are inserted into the second receiving cavity 1221 to achieve the connection between the front connecting seat 400 and the front wheel frame 120. A second pivot hole 4111 penetrating its housing structure is provided approximately at the center of the front pivot portion 411, and the second pivot hole 4111 is adapted for a pivot shaft (not shown in the attached drawings of this embodiment) to pass through. A second locking hole 4112 penetrating its housing structure is provided off-center from the center of the front pivot portion 411, and the second locking hole 4112 is adapted for a first locking member 710 (see...) Figure 59 Furthermore, a third through hole 4115 penetrating the housing structure is provided at an off-center location of the front pivot portion 411. The third through hole 4115 is used for the second follower 642 (see below) to pass through. The third through hole 4115 is closer to the second pivot hole 4111 than the second locking hole 4112. Furthermore, a plurality of locking holes 4116 are also provided at the circumferential edge of the front pivot portion 411. The plurality of locking holes 4116 are engaged with a plurality of locking hooks 1011 in a one-to-one manner to realize the installation of the cover 101 on the front pivot portion 411.

[0273] Specifically, such as Figure 50 and Figure 51 As shown, the rider connector 300 includes a rider connector body 310 and a rider reinforcement member embedded in the rider connector body 310. Figure 50 and Figure 51(Not shown in the image). The rider connection body 310 has a rider pivot portion 311 and a rider connection portion 312. The rider pivot portion 311 is generally a disc-shaped housing, and the rider connection portion 312 is a straight tubular housing extending outward in the tangential direction of the rider pivot portion 311. The rider lever 112 has a hollow first receiving cavity 1121 at at least its bottom end, and at least a portion of the rider connection portion 312 and at least a portion of the rider reinforcement 320 are inserted into the first receiving cavity 1121 to achieve the connection between the rider connection seat 300 and the rider frame 110. The rider pivot portion 311 has a first pivot hole 3111 extending through its housing structure in the left-right direction at approximately its center. The hole wall of the first pivot hole 3111 on the inner housing of the rider pivot portion 311 protrudes away from the rear connection seat 500 to form a mounting cylinder 3116. The rider pivot portion 311 also has a first locking member 710 (see image). Figure 59 A first locking hole 3112 is provided. The first locking hole 3112 is offset from the center of the handlebar pivot 311 and penetrates its housing structure in a left-right direction. The handlebar pivot 311 is also provided with a second through hole 3117. The second through hole 3117 is offset from the center of the handlebar pivot 311 and penetrates the handlebar pivot 311 in a left-right direction. The second through hole 3117 is closer to the handlebar pivot 312 than the first locking hole 3112. The handlebar pivot 311 is also provided with a first auxiliary locking hole 3118. The first auxiliary locking hole 3118 is offset from the center of the handlebar pivot 311 and penetrates the handlebar pivot 311 in a left-right direction. The first auxiliary locking hole 3118 is closer to the handlebar pivot 312 than the first locking hole 3112. The first auxiliary locking hole 3118 is farther away from the center of the handlebar pivot 311 than the first locking hole 3112 and the second through hole 3117.

[0274] Specifically, such as Figure 52 and Figure 53 As shown, the rear connector 500 includes a rear connector body 510 and a rear reinforcing member embedded in the rear connector body 510. Figure 52 and Figure 53 (Not shown). The rear connecting body 510 has a rear pivot portion 511 and a rear connecting portion 512. The rear pivot portion 511 is generally a disc-shaped housing, and the rear connecting portion 512 is a straight tubular housing extending radially outward from the rear pivot portion 511. The rear side rod 132 has a hollow third receiving cavity (not shown) at least at its top end, and at least a portion of the rear connecting portion 512 and at least a portion of the rear reinforcing member are inserted into the third receiving cavity to achieve the connection between the rear connecting seat 500 and the rear wheel frame 130. The rear pivot portion 511 has a third pivot hole 5111 penetrating its housing structure at approximately its center, and the third pivot hole 5111 is adapted to accommodate a pivot shaft ( Figure 52 and Figure 53(Not shown) Through which the first locking member 710 (see...) passes. A third locking hole 5112 penetrating the housing structure is provided at an off-center location on the rear pivot portion 511. The third locking hole 5112 is adapted to accommodate the first locking member 710 (see...) Figure 59 Furthermore, the rear pivot portion 511 is provided with a fifth through-hole 5118 penetrating its housing structure. The fifth through-hole 5118 is a straight groove offset from the third pivot hole 5111. The fifth through-hole 5118 is adapted for the drive member 610 (see below) to pass through. Furthermore, as Figure 52 As shown, the inner shell of the rear pivot 511, that is, the side of the rear pivot 511 facing the driver's pivot 311, is provided with a sixth through slot 5119. The sixth through slot 5119 is a blind slot, meaning it does not penetrate the shell structure of the rear pivot 511; it is only provided on the surface of the inner shell of the rear pivot 511. The sixth through slot 5119 is approximately an arc-shaped slot centered on the third pivot hole 5111. The sixth through slot 5119 is used for the first driven member 641 (see below) to pass through. Figure 53 As shown, the outer shell of the rear pivot portion 511, that is, the side of the rear pivot portion 511 facing away from the front pivot portion 411, is provided with a seventh through slot 5110. The seventh through slot 5110 is a blind slot, that is, the seventh through slot 5110 does not penetrate the shell structure of the rear pivot portion 511, and the seventh through slot 5110 is only provided on the surface of the outer shell of the rear pivot portion 511. The seventh through slot 5110 is approximately an arc-shaped slot with the third pivot hole 5111 as the center. The projections of the sixth through slot 5119 and the seventh through slot 5110 in the extension direction of the pivot shaft 102 are symmetrically arranged about the extension direction of the fifth through slot 5118.

[0275] In one embodiment, such as Figure 55 and Figure 56As shown, the frame 10 may also include a seat holder 900. The seat holder 900 is mounted on the side of the handlebar pivot 311 facing away from the rearward pivot 511. The seat holder 900 is generally a square shell structure, specifically including a holder body 910 and a fixing cover 920. The holder body 910 is generally elongated and is arranged along the extension direction of the handlebar 112. The holder body 910 includes a seat mounting portion 911 and a fixing shell portion 912 that are connected to each other. The holder body 910 is a one-piece molded structure. However, the present invention is not limited thereto; for example, the holder body 910 may also be formed by welding or fusion connecting the independent seat mounting portion 911 and the fixing shell portion 912. The seat mounting portion 911 is also provided with a second engaging portion 9111 that can engage with the first engaging portion 1411. The first engaging portion 1411 can be, for example, an engaging hook, and the second engaging portion 9111 can be, for example, an engaging groove that engages with the first engaging portion 1411. Furthermore, a mating protrusion 9112 can be provided on the seat mounting portion 911, and a mating recess 1412 that engages with the mating protrusion 9112 can be provided on the seat mounting base 141 to enhance the installation stability between the seat frame 140 and the rider connecting seat 300. Even more significantly, the mating protrusion 9112 is provided with crisscrossing reinforcing ribs 9112a to enhance its structural strength. The mating protrusion 9112 is arranged approximately in a vertical direction perpendicular to the ground, that is, the mating protrusion 9112 is approximately perpendicular to the horizontal tube 800. In other words, the direction in which the mating protrusion 9112 is arranged at an angle to the direction in which the mounting base body 910 is arranged.

[0276] Please see also Figures 57 to 59The fixed housing 912 has a mounting groove 9120 facing away from the driver's seat 300, and a fixed outer cover 920 is used to cover the opening of the mounting groove 9120. The fixed housing 912 also has a pivot sleeve 9121, which has a fourth pivot hole 9121a extending along its axial direction and penetrating the side of the fixed housing 912 facing the driver's seat 311. Thus, the fixed housing 912 is fitted over the mounting sleeve 3116 of the driver's seat 311 through the fourth pivot hole 9121a to achieve the pivot connection between the seat fixing seat 900 and the driver's seat 300. In this embodiment, the pivot sleeve 9121 is connected to the bottom of the mounting groove 9120. Furthermore, the fixed housing 912 also has a horizontal tube mounting sleeve 913. The horizontal tube mounting cylinder 913 extends from the bottom of the mounting groove 9120 in a direction substantially perpendicular to the bottom of the mounting groove 9120, i.e., in the lateral direction. The horizontal tube mounting cylinder 913 has a hollow inner cavity 9131, which communicates with the first locking hole 3112. The horizontal tube mounting cylinders 913 of the two seat fixing seats 900 located on the left and right sides of the frame 10 are arranged opposite each other, with both ends of the horizontal tube 800 inserted into the hollow inner cavities 9131 of the two horizontal tube mounting cylinders 913 respectively. Furthermore, the fixed housing 912 also has an operating groove 9122. The operating groove 9122 is approximately located above the horizontal tube mounting cylinder 913. The bottom of the operating groove 9122 has a second auxiliary locking hole 9123, which is opposite to and communicates with the first auxiliary locking hole 3118 of the handrail pivot 311. Furthermore, the fixed outer cover 920 has a fourth pivot auxiliary hole 921. The fourth pivot hole 921 is positioned opposite to and communicates with the fourth pivot hole 9121a, so that the fourth pivot hole 9121a is exposed when the fixed outer cover 920 is placed over the fixed housing portion 912. Furthermore, the fixed outer cover 920 is provided with a mounting hole 922, the shape and position of which correspond to the horizontal tube mounting cylinder 913 and the operating groove 9122, so that the operating groove 9122 is exposed when the fixed outer cover 920 is placed over the fixed housing portion 912, and at least part of the horizontal tube mounting cylinder 913 can also be exposed on the outside of the fixed outer cover 920.

[0277] like Figure 49 , Figure 51 and Figure 52 As shown, the frame 10 proposed in this invention also includes a retraction linkage mechanism 600 disposed between the rider connector 300, the front connector 400, and the rear connector 500. When the frame 10 switches from the extended state to the retracted state, the rider connector 300 rotates, and the retraction linkage mechanism 600 drives one of the front connector 400 and the rear connector 500 to rotate and retract together with the other of the front connector 400 and the rear connector 500.

[0278] like Figure 49 , Figure 51 and Figure 52 As shown, the retraction linkage mechanism 600 may include a driving member 610, a first driven member 641, a second driven member 642, a first connecting rod 651, and a second connecting rod 652. Both the first connecting rod 651 and the second connecting rod 652 are arc-shaped rods. The first connecting rod 651 is located between the driver's pivot 311 and the rear pivot 511, and the second connecting rod 652 is located between the rear pivot 511 and the front pivot 411. The driving member 610 passes through a fifth through slot 5118 and is connected to one end of the first connecting rod 651 and one end of the second connecting rod 652. The first driven member 641 passes through a second through hole 3117 in the driver's pivot 311 and the other end of the first connecting rod 651, and is inserted into a sixth through slot 5119 in the rear pivot 511. The second follower 642 passes sequentially through the third through hole 4115 of the front pivot 411 and the other end of the second connecting rod 652 and is inserted into the seventh through slot 5110 of the rear pivot 511.

[0279] Please see also Figures 52 to 54 The fifth through slot 5118 has a first end 5118a away from the rear connecting portion 512 and a second end 5118b near the rear connecting portion. The sixth through slot 5119 has a first end 5119a near the fifth through slot 5118 and a second end 5119b away from the fifth through slot 5118. The seventh through slot 5110 has a first end 5110a near the fifth through slot 5118 and a second end 5110b away from the fifth through slot 5118. When the frame 10 is in the unfolded state, as... Figure 52 and Figure 53 As shown, the drive member 610 is located at the first end 5118a of the fifth through slot 5118, the first driven member 641 is located at the first end 5119a of the sixth through slot 5119, and the second driven member 642 is located at the first end 5110a of the seventh through slot 5110. When the frame 10 is in the retracted state, as... Figure 54 As shown, the driving member 610 is located at the second end 5118b of the fifth through slot 5118, the first driven member 641 is located at the second end 5119b of the sixth through slot 5119, and the second driven member 642 is located at the second end 5110b of the seventh through slot 5110. Please also refer to Figures 52 to 54. Figure 54 When the locking mechanism 700 releases the lock on the frame 10 in the unfolded state (see below for details), the first operating member 720 or the cross tube 800 can be operated, causing the frame 110 to move along... Figure 53 As shown, when the rider's frame 110 rotates in the R1 direction, it causes the rider's connecting seat 300 to rotate and retract in the R1 direction. At this time, the rider's pivot part 311 of the rider's connecting seat 300 also rotates in the R1 direction. Figure 53 The R1 direction rotates, thereby driving the drive member 610 inserted in the fifth through slot 5118 downward (i.e. Figure 53The drive member 610 moves from the first end 5118a to the second end 5118b within the fifth through slot 5118. Simultaneously, the drive member 610 drives the first driven member 641 to move from the first end 5119a to the second end 5119b within the sixth through slot 5119 via the first connecting rod 651. Since the center of the sixth through slot 5119 coincides with the pivot axis (i.e., with the third pivot hole 5111), the trajectory direction from the first end 5119a to the second end 5119b is the same as the opposite direction of the R1 direction. Therefore, the front connecting seat 400 rotates relative to the rider connecting seat 300 in the opposite direction of the R1 direction, thereby causing the front wheel frame 120 to retract towards the rider frame 110 and the rear wheel frame 130. Simultaneously, the drive member 610 also drives the second driven member 642 to move from the first end 5110a to the second end 5110b within the seventh through slot 5110 via the second linkage 652. Since the center of the seventh through slot 5110 coincides with the pivot axis (i.e., with the third pivot hole 5111), the trajectory direction from the first end 5110a to the second end 5110b is the same as the R1 direction. Therefore, the rear connecting seat 500 rotates relative to the rider connecting seat 300 in the R1 direction, thereby causing the rear wheel frame 130 to retract towards the rider frame 110 and the front wheel frame 120. At the same time, the rotation of the rider connecting seat 300 also causes the seat frame 140 mounted on it to rotate. In this way, the frame 10 can be folded up as a whole. The folding linkage mechanism 600 has a simple structure and is easy to process and assemble. Since there is no need to set up an additional folding mechanism, relevant holes and slots are formed on the driver's connecting seat 300, front connecting seat 400 and rear connecting seat 500 that form the pivot joint of the frame 10, and the folding is achieved by the drive member 610 passing through. The overall volume of the frame 10 after folding up will be lighter and thinner than the existing frame 10.

[0280] Furthermore, such as Figures 58 to 60As shown, the frame 10 may also include a locking mechanism 700. The locking mechanism 700 is disposed between the rider connector 300, the front connector 400, and the rear connector 500. The locking mechanism 700 is switchable between a locked state and an unlocked state. When the locking mechanism 700 is in the locked state, the frame 10 is locked in an extended or retracted state. When the locking mechanism 700 is in the unlocked state, the frame 10 is switchable between the extended and retracted states. Similar to the locking mechanism 700 in the first embodiment, the locking mechanism 700 may include, for example, a first locking member 710, which is a pin-shaped structure. In this embodiment, there are two first locking members 710, each adapted to lock the seat fixing seat 900, rider connector 300, rear connector 500, and front connector 400 located on the left and right sides of the frame 10, respectively. Taking one side of the first locking member 710 as an example, the first locking member 710 is at least partially disposed within the cross tube 800. The first locking member 710 is switchable between a first locking position and a second locking position. When the first locking member 710 is in the first locking position, such as Figure 59 As shown, one end of the first locking member 710 passes through the first locking hole 3112, the third locking hole 5112, and the second locking hole 4112, locking the frame 10 in the unfolded position. When the first locking member 710 is in the first unlocked position, as... Figure 60 As shown, one end of the first locking member 710 exits the second locking hole 4112, the third locking hole 5112 and the first locking hole 3112 and retracts into the horizontal tube 800, so that the frame 10 can be folded.

[0281] Furthermore, such as Figures 58 to 60 As shown, similar to the previous embodiment, the locking mechanism 700 may further include a first operating member 720, a linkage member 740, and an elastic reset member 730. However, the first operating member 720 in this embodiment is slightly different from that in the first embodiment. There are two linkage members 740 and two elastic reset members 730, respectively disposed on the left and right sides inside the horizontal tube 800. There is one first operating member 720, which is rotatably sleeved on the outside of the horizontal tube 800. The first operating member 720 is drivenly connected to the two linkage members 740 respectively.

[0282] like Figure 58 and Figure 61As shown, the first operating element 720, or operating knob 720 of the present invention, may also include a knob housing 723, a knob driving element 724, and a horizontal tube sliding element 725. There are two horizontal tube sliding elements 725, spaced apart on the horizontal tube 800. Both horizontal tube sliding elements 725 are sleeved on the outside of the horizontal tube 800 and slidably connected to it. Specifically, taking one of the horizontal tube sliding elements 725 as an example, the horizontal tube sliding element 725 is provided with a driving protrusion 726, and the horizontal tube 800 is provided with an elongated slot 830. The driving protrusion 726 can be inserted into the elongated slot 830 and move along the elongated slot 830. The driving protrusion 726 is connected to one end of the linkage 740 to drive the linkage 740 to move. Both horizontal tube sliders 725 are generally cylindrical in shape, and each of the two horizontal tube sliders 725 has a drive groove 7251 at its opposite ends. Each drive groove 7251 is formed by a first drive inclined surface 7252 and a second drive inclined surface 7253 that are inclined at a certain angle to each other. Each horizontal tube slider 725 may have, for example, two drive grooves 7251, which are symmetrically arranged vertically along the outer peripheral wall of the horizontal tube slider 725.

[0283] See also Figure 58 and Figure 61Two knob drive members 724 are spaced apart on the horizontal tube 800. Each knob drive member 724 is driven by one of two horizontal tube sliders 725. Specifically, both knob drive members 724 are sleeved outside the horizontal tube 800 and located on opposite sides of the corresponding horizontal tube slider 725, i.e., on the side of the corresponding horizontal tube slider 725 where the drive groove 7251 is located. Specifically, taking one knob drive member 724 as an example, the knob drive member 724 includes a drive part 7241 and a rotating part 7242 connected to each other. The knob drive member 724 is a one-piece molded structure. However, the invention is not limited to this; the knob drive member 724 can also be formed by welding or fusion of independent drive parts 7241 and rotating parts 7242. The drive part 7241 is generally cylindrical and sleeved outside the horizontal tube 800. A drive block 7241a is provided on the side of the drive part 7241 facing the corresponding horizontal tube slider 725. The driving block 7241a is generally a triangular block structure, including a third driving inclined surface 7241b and a fourth driving inclined surface 7241c that are inclined at a certain angle to each other. Each driving part 7241 has two driving blocks 7241a, which are symmetrically arranged vertically along the outer peripheral wall of the driving wall. Further, the third driving inclined surface 7241b and the fourth driving inclined surface 7241c of the driving part 7241 abut against the first driving inclined surface 7252 and the second driving inclined surface 7253 of the horizontal tube slider 725, respectively. The rotating part 7242 is generally an L-shaped plate structure. The rotating part 7242 can be rotated to drive the driving part 7241 to rotate around the horizontal tube 800, so that the third driving inclined surface 7241b and the fourth driving inclined surface 7241c abut against the first driving inclined surface 7252 and the second driving inclined surface 7253 respectively, thereby driving the horizontal tube slider 725 to slide along the horizontal tube 800.

[0284] Specifically, such as Figure 58 and Figure 61 As shown, the knob housing 723 includes a sleeve portion 7231 and an operating portion 7232 connected to each other. The knob housing 723 is a one-piece molded structure. However, the present invention is not limited thereto; the knob housing 723 can also be formed by welding or fusion of the independent sleeve portion 7231 and the operating portion 7232. The sleeve portion 7231 has a sleeve cavity 7231a, which is sleeved outside the horizontal tube 800, and the driving portions 7241 of the two horizontal tube sliding members 725 and the two knob driving members 724 are all located within the sleeve cavity 7231a. The operating portion 7232 has an operating cavity 7232a, which communicates with the sleeve cavity 7231a. The rotating portions 7242 of the two knob driving members 724 are located within the operating cavity 7232a. The operating portion 7232 is adapted to be rotated, thereby driving the two knob driving members 724 to rotate around the horizontal tube 800.

[0285] The structure and connection relationship of the linkage 740 and the elastic reset member 730 in this embodiment are roughly the same as those of the linkage 740 and the elastic reset member 730 in the first embodiment, and will not be described again here.

[0286] Furthermore, such as Figures 58 to 60 As shown, the locking mechanism 700 in this embodiment may further include an auxiliary locking member 770. The auxiliary locking member 770 is switchable between a third locking position and a third unlocking position. The driver's connecting seat 300 has a first auxiliary locking hole 3118, and the seat fixing seat 900 has a second auxiliary locking hole 9123. When the auxiliary locking member 770 is in the third locking position, as... Figure 59 As shown, the auxiliary locking member 770 is adapted to be inserted into the first auxiliary locking hole 3118 and the second auxiliary locking hole 9123 to lock the seat fixing seat 900 relative to the driver's connecting seat 300. When the auxiliary locking member 770 is in the third unlocking position, as... Figure 60 As shown, the auxiliary locking member 770 is adapted to be removed from the first auxiliary locking hole 3118 and the second auxiliary locking hole 9123, so that the seat fixing seat 900 can rotate relative to the rider connecting seat 300. Of course, in some embodiments, when the front connecting seat 400 is located at the innermost side of the frame 10 relative to the rider connecting seat 300 and the rear connecting seat 500, the first auxiliary locking hole 3118 can also be provided on the front connecting seat 400, so that selective locking between the front connecting seat 400 and the seat fixing seat 900 can be achieved by the auxiliary locking member 770. Or in other embodiments, when the rear connecting seat 500 is located at the innermost side of the frame 10 relative to the rider connecting seat 300 and the front connecting seat 400, the first auxiliary locking hole 3118 can also be provided on the rear connecting seat 500, so that selective locking between the rear connecting seat 500 and the seat fixing seat 900 can be achieved by the auxiliary locking member 770.

[0287] Furthermore, such as Figures 58 to 60As shown, the locking mechanism 700 may further include an auxiliary operating member 780. The auxiliary operating member 780 is connected to the auxiliary locking member 770 and can be operated to move the auxiliary locking member 770 between a third locked position and a third unlocked position. Specifically, the auxiliary operating member 780 is generally L-shaped and includes a locking member connecting portion 781 and a linkage portion 782 connected to each other. The locking member connecting portion 781 is at least partially located within the operating groove 9122. The auxiliary locking member 770 is at least partially located within the operating groove 9122 and connected to the side of the locking member connecting portion 781 facing the bottom of the operating groove 9122. When the auxiliary locking member 770 is in the third locked position, the auxiliary locking member 770 is adapted to be inserted into the second auxiliary locking hole 9123 and the first auxiliary locking hole 3118 to lock the seat fixing seat 900 relative to the driver's connecting seat 300. Furthermore, a sliding groove 9132 is provided on the side wall of the horizontal tube mounting cylinder 913, and the sliding groove 9132 communicates with the hollow inner cavity 9131 of the horizontal tube mounting cylinder 913. The linkage part 782 is movably disposed in the sliding groove 9132. The linkage part 782 is operable to slide along the sliding groove 9132, thereby driving the auxiliary locking member 770 to slide between the third locking position and the third unlocking position through the locking member connecting part 781.

[0288] Please participate together Figure 39 as well as Figures 41 to 43 As shown, when the auxiliary locking element 770 is in the third unlocking position (e.g.) Figure 60 As shown), the seat holder 900 can rotate relative to the driver's connecting seat 300. Furthermore, when the seat frame 140 is mounted forward on the seat holder 900, the seat holder 900 can cause the seat frame 140, which is engaged with the second engaging portion 9111, to rotate relative to the driver's connecting seat 300 towards the front of the frame 10 (as shown). Figure 39 , Figures 41 to 43 When the seat frame 140 is mounted rearward on the seat holder 900, the seat holder 900 can cause the seat frame 140, which is engaged with the second engagement part 9111, to rotate relative to the rider connecting seat 300 towards the rear of the frame 10 (e.g., Figure 40 , Figures 44 to 46 In this way, whether the seat frame 140 is installed in the front or rear on the seat mounting base 900, the folded size of the frame 10 can be more compact. Users do not need to remove the seat frame 140 or adjust the usage direction of the seat frame 140 before folding the frame 10 in order to obtain a smaller folded size, making the overall use of the frame 10 simpler and more convenient.

[0289] The operating principle of the locking mechanism 700 in this embodiment is explained in detail below:

[0290] like Figure 59 and Figure 60As shown, when it is necessary to release the locking mechanism 700 to retract the frame 10, the auxiliary operating member 780 can be pushed along the D2 direction, so that the auxiliary operating member 780 drives the auxiliary locking member 770 to move from the third locking position to the third releasing position, thereby releasing the lock of the seat fixing seat 900 relative to the rider fixing seat 760, and the seat fixing seat 900 can rotate relative to the rider fixing seat 760. Simultaneously, the knob housing 723 can be rotated along the R2 direction. The knob housing 723 drives the knob drive 724 to rotate along the R2 direction as well. The knob drive 724 pushes against the first drive slope 7252 and the second drive slope 7253 of the horizontal tube slide 725 through its third drive slope 7241b and fourth drive slope 7241c respectively, thereby driving the horizontal tube slide 725 to slide along the D2 direction. At the same time, the horizontal tube slide 725 drives the linkage 740 to move along the D2 direction through the drive protrusion 726. The linkage 740 drives the first locking member 710 to move from the first locked position to the first unlocked position. At this time, the elastic reset member 730 is compressed and deformed. The first locking member 710 exits from the second locking hole 4112, the third locking hole 5112 and the first locking hole 3112 in sequence, thereby releasing the locking mechanism 700 from locking the frame 10 in the unfolded position, so that the frame 10 can be folded.

[0291] like Figure 59 and Figure 60 As shown, when the frame 10 needs to be locked in the unfolded state by the locking mechanism 700, the force applied to the knob housing 723 is released. The linkage 740 then moves in the opposite direction of the D2 direction under the elastic restoring force of the elastic reset member 730. Simultaneously, the drive convex 726 drives the transverse tube sliding member 725 to move in the opposite direction of the D2 direction. At the same time, the first drive ramp 7252 and the second drive ramp 7253, respectively, cooperate with the third drive ramp 7241b and the fourth drive ramp 7241c to reset the knob drive part 7241 and the knob housing 723. During the movement of the linkage 740, the first locking member 710 moves from the first unlocked position to the first locked position. The first locking member 710 inserts into the first locking hole 3112, the third locking hole 5112, and the second locking hole 4112, thereby locking the frame 10 in the unfolded position. Meanwhile, the auxiliary operating member 780 can be moved in the opposite direction of the D2 direction by the connecting pin (not shown in the figure) connected between the connecting member 740 and the auxiliary operating member 780, so that the auxiliary operating member 780 can move the auxiliary locking member 770 from the third unlocking position to the third locking position, thereby locking the seat fixing seat 900 relative to the driver fixing seat 760.

[0292] It is worth noting that the operating principle of the aforementioned locking mechanism 700 is described with the seat frame 140 in the forward-facing installation position. When the seat frame 140 is in the forward-facing installation position, as... Figure 39As shown, since the seat frame 140 is located approximately in front of the cross tube 800, therefore along Figure 39 The R2 direction rotation of the control knob housing 723 makes operation more convenient and will not interfere with the seat frame 140. However, when the seat frame 140 is in the rear-facing mounting position, such as... Figure 40 As shown, since the seat frame 140 is located approximately behind the cross tube 800, therefore along Figure 40 The reverse rotation of the control button housing 723 in the R2 direction will make it easier to operate and will not interfere with the seat frame 140.

[0293] It is worth noting that, such as Figure 39 , Figures 41 to 43 As shown, when the seat frame 140 is in the forward-facing mounting position, during the process of switching the frame 10 from the unfolded state to the folded state, the seat fixing seat 900 is adapted to pivot relative to the cross tube 800 so that the second engaging part 9111 is located on the front side of the cross tube 800. In this way, the seat fixing seat 900 can drive the seat frame 140, which is engaged with the second engaging part 9111, to rotate to the front side of the cross tube 800. When the seat frame 140 is in the rear-facing mounting position, during the process of switching the frame 10 from the unfolded state to the folded state, the seat fixing seat 900 is adapted to pivot relative to the cross tube 800 so that the second engaging part 9111 is located on the rear side of the cross tube 800. In this way, the seat fixing seat 900 can drive the seat frame 140, which is engaged with the second engaging part 9111, to rotate to the rear side of the cross tube 800.

[0294] The aforementioned frame 10 and stroller have at least the following technical effects:

[0295] In the aforementioned frame 10, the rider connector 300, front connector 400, and rear connector 500 are pivotally connected via a pivot shaft 102. The rider connector 300, front connector 400, and rear connector 500 can be connected to the rider frame 110, front wheel frame 120, and rear wheel frame 130 of the frame 10, respectively. A retraction linkage mechanism 600 is provided between the rider connector 300, front connector 400, and rear connector 500. When the frame 10 switches from the extended state to the retracted state, the rider connector 300 rotates and drives the front connector 400 to rotate towards the rear connector 500 to retract via the retraction linkage mechanism 600, or the rider connector 300 rotates and drives the rear connector 500 to rotate towards the front connector 400 to retract via the retraction linkage mechanism 600. This frame 10 has a simple structure, and the retracted frame 10 is relatively thin.

[0296] like Figure 65As shown, another embodiment of the present invention provides an infant stroller, which also includes a foldable frame A10 and a seat cover (not shown in the figures) covering the frame A10. The frame A10 and the locking mechanism A200 (described later) of the infant stroller are thinner in the lateral dimension, thereby preventing the seating width of the frame A10 and the seat portion A320 (described later) of the infant stroller from being compressed due to the thicker size of the locking mechanism A200. This allows the seating width of the frame A10 and the seat portion A320 of the infant stroller to be adaptively increased as needed, thereby improving the riding experience.

[0297] like Figures 66 to 68 As shown, the frame A10 includes a first frame A100 and a locking mechanism A200. The first frame A100 has an unfolded state and a folded state. The locking mechanism A200 is disposed on the first frame A100. The locking mechanism A200 can switch between a first locked state and a first unlocked state. When the locking mechanism A200 is in the first locked state, the first frame A100 is locked in the unfolded state or the folded state. When the locking joint A400 is in the first unlocked state, the first frame A100 can switch between the unfolded state and the folded state. Thus, the locking mechanism A200 can selectively lock the first frame A100 in the unfolded state or the folded state, so that the first frame A100 can be more stably supported when it is unfolded, and can be better maintained in the folded state when it is needed for transportation or storage. In this embodiment, the locking mechanism A200 has a guide rail A211 and a slider A221 that can slide along the guide rail A211. The locking mechanism A200 can switch between a first locked state and a first unlocked state through the cooperation of the guide rail A211 and the slider A221.

[0298] In some embodiments, such as Figure 65 and Figure 66 As shown, the first frame A100 may include, for example, a rider frame A110, a front wheel frame A120, and a rear wheel frame A130. The rider frame A110 and the front wheel frame A120 are pivotally connected to each other and can be extended or retracted relative to each other. In this embodiment, the rider frame A110 and the front wheel frame A120 may be pivotally connected, for example, through a locking mechanism A200, i.e., the locking mechanism A200 is disposed between the rider frame A110 and the front wheel frame A120. The rear wheel frame A130 may also be pivotally connected to the rider frame A110, the front wheel frame A120, or the locking mechanism A200 to achieve coordinated folding and retraction among the rider frame A110, the front wheel frame A120, and the rear wheel frame A130. In this embodiment, the rear wheel frame A130 is pivotally connected to the locking mechanism A200.

[0299] like Figure 65 and Figure 66As shown, the rider frame A110 is generally U-shaped, including a push handlebar A111 located at the top and rider bars A112 connected to both ends of the push handlebar A111. The front wheel frame A120 is also generally U-shaped, including a front crossbar A121 located at the lower front and two front side bars A122 connected to both ends of the front crossbar A121. The rear wheel frame A130 is generally H-shaped, including a rear crossbar A131 located at the lower rear and two rear side bars A132 connected to both ends of the rear crossbar A131. Two locking mechanisms A200 can be provided. The ends of the two rider bars A112 away from the push handlebar A111 are respectively pivotally connected to the ends of the two front side bars A122 away from the front crossbar A121 via the two locking mechanisms A200. The two rear side bars A132 are also respectively pivotally connected to the two locking mechanisms A200.

[0300] Please continue reading Figures 65 to 67 The structure and connection relationship between the first frame A100 and the locking mechanism A200 are further described below using the structure of one side of the frame A10 along the left-right direction: The locking mechanism A200 includes a first connecting seat A210 and a second connecting seat A220 that are pivotally connected to each other. The guide rail A211 mentioned above can be provided on the first connecting seat A210, and the sliding member A221 mentioned above can be provided on the second connecting seat A220. The first connecting seat A210 can be connected to one of the handlebars A112, for example, and the second connecting seat A220 can be connected to one of the front side rods A122, for example. Of course, in other embodiments not shown, the reverse can also be true, that is, the first connecting seat A210 is connected to one of the front side rods A122, and the second connecting seat A220 is connected to one of the handlebars A112. In this embodiment, the opposite top end of the rear side rod A132 is pivotally connected to the first connecting seat A210. The first frame A100 may also include a linkage frame A140, for example. Linkage frame A140 is pivotally connected to the rear side bar A132 and the second connecting seat A220. Linkage frame A140 is roughly a U-shaped frame structure, including a linkage crossbar A141 and two linkage side bars A142 connected to both ends of the linkage crossbar A141. Taking one linkage side bar A142 as an example, one end of the linkage side bar A142 is pivotally connected to the rear side bar A132, and the other end is pivotally connected to the second connecting seat A220. Thus, the first connecting seat A210, the rear side bar A132, the linkage side bar A142, and the second connecting seat A220 are pivotally connected to form a four-bar linkage structure. When the first connecting seat A210 and the second connecting seat A220 are brought closer together and folded, the rear side bar A132 and the linkage side bar A142 can be pivotally folded together, thereby causing the rider frame A110, the front wheel frame A120, and the rear wheel frame A130 to fold closer together.

[0301] Furthermore, such as Figure 67 and Figure 68As shown, the sliding member A221 has a frame locking position and a frame unlocking position on the guide rail A211. When the sliding member A221 is in the frame locking position, the locking mechanism A200 is in a first locked state; when the sliding member A221 is in the frame unlocking position, the locking mechanism A200 is in a first unlocking state. Specifically, the frame locking position may also include an unfolded locking position and a folded locking position. When the sliding member A221 is in the unfolded locking position, as shown... Figure 67 As shown, when the locking mechanism A200 is in the first locked state, the first frame A100 is locked in the unfolded state; when the sliding member A221 is in the folded locking position, as... Figure 68 As shown, the locking mechanism A200 is in the first locking state, and the first frame A100 is locked in the folded state.

[0302] Specifically, please refer to the following: Figure 67 , Figure 68 and Figure 72 The sliding trajectory of slider A221 along guide rail A211 is perpendicular to the pivot axis O1 of first connecting seat A210 and second connecting seat A220. It should be noted that the sliding trajectory of slider A221 along guide rail A211 can be a curved trajectory, a straight trajectory, or a trajectory combining curves and straight lines, and is not limited here.

[0303] In this embodiment, specifically, the guide rail A211 may include an arc-shaped track centered on the pivot axis O1 of the first connecting seat A210 and the second connecting seat A220. More specifically, the guide rail A211 may be, for example, a guide groove A211', and the slider A221 is located within the guide groove A211' and can slide along the guide groove A211'. The guide groove A211' includes an arc-shaped groove centered on the pivot axis O1 of the first connecting seat A210 and the second connecting seat A220. In this embodiment, the guide groove A211' is disposed on the side of the first connecting seat A210 facing the second connecting seat A220. The guide groove A211' includes a main groove segment A2110 and a locking recess A2111 that are interconnected. When the slider A221 is in the locked position, it engages with the locking recess A2111, and the locking mechanism A200 is in the first locked state, locking the first frame A100 in either the unfolded or folded state. When the slider A221 is in the unlocked position, it moves out of the locking recess A2111 and into the main groove section A2110. When the locking mechanism A200 is in the first unlocked state, the main groove section A2110 provides a sliding path for the slider A221, allowing the first connecting seat A210 and the second connecting seat A220 to rotate relative to each other.

[0304] Specifically, the locking recess A2111 may include a first locking recess A2111a and a second locking recess A2111b. When the slider A221 is engaged with the first locking recess A2111a, as follows: Figure 67 As shown, the locking mechanism A200 is in the first locked state, and the first frame A100 is locked in the unfolded state; when the sliding member A221 engages with the second locking recess A2111b, as... Figure 68 As shown, the locking mechanism A200 is in a first locked state, and the first frame A100 is locked in a folded state. More specifically, the guide groove A211' has at least a partial recess on the side wall near the pivot axis O1 to form a first locking recess A2111a and a second locking recess A2111b. It should be understood that "recessed towards the pivot axis O1" can be achieved in two ways: one is by the guide groove A211' having at least a partial protrusion on the side wall near the pivot axis O1, meaning the thickness of the groove wall near the pivot axis O1 from the main groove segment A2110 to the locking recess A2111 does not change; the other is by the guide groove A211' having at least a partial reduction in thickness on the side wall near the pivot axis O1, meaning the thickness of the groove wall near the pivot axis O1 from the main groove segment A2110 to the locking recess A2111 decreases. In this embodiment, the first locking recess A2111a is formed by the first method described above, and the second locking recess A2111b is formed by the second method described above. However, the present invention does not limit this, that is, the first locking recess A2111a and the second locking recess A2111b can also be formed by other methods.

[0305] In this embodiment, the depth of the first locking recess A2111a is greater than the depth of the second locking recess A2111b. Thus, when the slider A221 engages with the first locking recess A2111a, due to the greater depth of the first locking recess A2111a, the slider A221 is unlikely to disengage from the first locking recess A2111a unless manually released (see later description), thereby ensuring that the first frame A100 is stably held in the unfolded state. When the slider A221 engages with the second locking recess A2111b, due to the smaller depth of the second locking recess A2111b, when a certain external force is applied to a part of the frame A10 (e.g., the rider frame A110), the slider A221 can be moved out of the second locking recess A2111b to release the lock on the frame A10 in the folded state, thereby easily unfolding the frame A10. In this embodiment, the first locking recess A2111a and the second locking recess A2111b are located at the two ends of the guide groove A211', so the cooperation between the guide groove A211' and the sliding member A221 can also limit the relative rotation angle range of the first connecting seat A210 and the second connecting seat A220, thereby limiting the relative rotation angle range of the frame A10 and the front wheel frame A120.

[0306] It should be understood that in this embodiment, the main groove segment A2110 is an arc-shaped segment centered on the pivot axis O1 of the first connecting seat A210 and the second connecting seat A220. The locking recesses A2111 (the first locking recess A2111a and the second locking recess A2111b) are recessed radially relative to the main groove segment A2110 along the pivot axis O1. The sliding trajectory of the slider A221 includes an arc-shaped trajectory moving within the main groove segment A2110 and a straight-line trajectory moving radially from the main groove segment A2110 to the locking recesses A2111 (the first locking recess A2111a and the second locking recess A2111b). The arc-shaped trajectory and the straight-line trajectory are located in the same plane. Both the arc-shaped trajectory and the straight-line trajectory are perpendicular to the pivot axis O1.

[0307] In this embodiment, the pivot axis O1 of the first connecting seat A210 and the second connecting seat A220 extends along the left-right direction of the first frame A100 (or the lateral or width direction of the frame A10). Taking this as an example, the sliding member A221 slides along the guide rail A211 approximately perpendicular to the pivot axis O1 of the first connecting seat A210 and the second connecting seat A220 (i.e., the left-right direction of the first frame A100 in this embodiment), rather than moving along the left-right direction of the first frame A100. This reduces the space provided by the first frame A100 for the sliding member A221 to move in the left-right direction. Therefore, the locking mechanism A200 is thinner in the left-right direction, requiring less lateral space in the first frame A100, thus facilitating an increase in the left-right dimension of the second frame A300 and improving the riding experience.

[0308] In embodiments not shown, the guide rail A211 may not be the guide groove A211'. For example, the guide rail A211 may be a guide protrusion (not shown in the figures), and the slider A221 may have a sliding groove (not shown in the figures). The guide protrusion passes through the sliding groove of the slider A221, and the slider A221 can slide relative to the guide protrusion. Alternatively, the guide rail A211 may be a roller track (not shown in the figures), and the slider A221 may have rollers (not shown in the figures), allowing the slider A221 to slide on the roller track. In short, as long as a sliding connection between the guide rail A211 and the slider A221 can be achieved, the present invention does not limit its specific implementation.

[0309] Furthermore, please also refer to Figure 71 and Figure 72 The first connecting seat A210 has a first limiting part A212 protruding on the side facing the second connecting seat A220, and the second connecting seat A220 has a second limiting part A222 protruding on the side facing the first connecting seat A210. See also Figure 67When the first frame A100 is in the unfolded state, the first limiting part A212 abuts against the second limiting part A222, thereby ensuring that the first frame A100 has sufficient support strength when it is in the unfolded state, and further ensuring that the first frame A100 is stably kept in the unfolded state.

[0310] Please continue reading Figure 71 and Figure 72 The first connecting seat A210 includes a first connecting portion A213 and a first pivot portion A214 that are interconnected. In this embodiment, the first connecting portion A213 and the first pivot portion A214 are integrally formed. In other embodiments, the first connecting portion A213 and the first pivot portion A214 may also be independent components connected by means such as welding or riveting. The first connecting portion A213 is adapted to connect to one end of the handlebar A112 away from the push handle portion A111. In this embodiment, the first connecting portion A213 is generally in the form of a sleeve, and one end of the handlebar A112 away from the push handle portion A111 is inserted into the first connecting portion A213 and connected to the first connecting portion A213 by fasteners such as screws. Of course, in other embodiments, the configuration can be reversed, i.e., the end of the handlebar A112 away from the push handle portion A111 is a sleeve-like structure, and the first connecting portion A213 is inserted into the handlebar A112 and connected to the handlebar A112 by fasteners such as screws. The first pivot portion A214 is a shell-like structure. The guide groove A211' and the first limiting portion A212 mentioned above are both provided in the first pivot portion A214. A pivot protrusion A2141 is provided approximately in the middle of the first pivot portion A214. In this embodiment, the first pivot portion A214 is approximately a disc-shaped structure, and the pivot protrusion A2141 is located at the center of the first pivot portion A214. Of course, in other embodiments, the first pivot portion A214 can also be a non-circular structure such as a square, in which case the pivot protrusion A2141 is located, for example, at the geometric center of the first pivot portion A214. Furthermore, the first connecting seat A210 may also include a rear pivot portion A215, which is adapted to be pivotally connected to the opposite top end of the rear side rod A132. In this embodiment, the rear pivot portion A215 is located on one side of the first connecting portion A213.

[0311] Please continue reading Figure 71 and Figure 72The second connecting seat A220 includes a second connecting portion A223 and a second pivot portion A224 that are interconnected. In this embodiment, the second connecting portion A223 and the second pivot portion A224 are integrally formed. In other embodiments, the second connecting portion A223 and the second pivot portion A224 can also be independent components connected by means such as welding or riveting. The second connecting portion A223 is adapted to connect to the end of the front side rod A122 that is away from the front crossbar A121. In this embodiment, the second connecting portion A223 is generally sleeve-shaped, and the end of the front side rod A122 that is away from the front crossbar A121 is inserted into the second connecting portion A223 and connected to the second connecting portion A223 by fasteners such as screws. Of course, in other embodiments, the reverse can also be true, that is, the end of the front side rod A122 that is away from the front crossbar A121 is sleeve-shaped, and the second connecting portion A223 is inserted into the front side rod A122 and connected to the front side rod A122 by fasteners such as screws. The second pivot portion A224 has a shell-like structure. The aforementioned sliding member A221 is movably disposed in the second pivot portion A224. A pivot groove A2241 is provided approximately in the center of the second pivot portion A224. The pivot protrusion A2141 of the first pivot portion A214 is inserted into the pivot groove A2241 of the second pivot portion A224 to realize the pivot connection of the first connecting seat A210 and the second connecting seat A220, thereby realizing the pivot connection of the rider frame A110 and the front wheel frame A120. Of course, in other embodiments, it can also be the other way around, that is, the first pivot portion A214 is provided with the pivot groove A2241, and the second pivot portion A224 is provided with the pivot protrusion A2141. In this embodiment, the second pivot portion A224 is a disc-shaped structure that is approximately the same as that of the first pivot portion A214, and the pivot groove A2241 is located at the center of the second pivot portion A224. In other embodiments, the second pivot portion A224 may also be a structure of other shapes, such as square or elliptical, and the pivot groove A2241 may be located at the geometric center of the second pivot portion A224. The first connecting seat A210 and the second connecting seat A220 are arranged along the axial direction of the pivot axis O1. When the first connecting seat A210 and the second connecting seat A220 are pivoted, the first pivot portion A214 and the second pivot portion A224 engage with each other to form a first accommodating space A201 (e.g., Figure 69 or Figure 70(As shown). The second pivot portion A224 has a movable hole A2242 on the side facing the first pivot portion A214, and at least a portion of the sliding member A221 is movably disposed within the movable hole A2242. In this embodiment, the movable hole A2242 extends approximately along the radial direction of the second pivot portion A224, allowing at least a portion of the sliding member A221 to move along the radial direction of the second pivot portion A224. Further, the second connecting seat A220 also includes a seat mounting portion A225 for mounting the second frame A300 (described later). The seat mounting portion A225 is located on the side of the second pivot portion A224 opposite to the first pivot portion A214. The seat mounting portion A225 has a movable groove A2251. The movable groove A2251 communicates with the movable hole A2242. At least a portion of the sliding member A221 is movably disposed within the movable groove A2251.

[0312] For details, please continue to see Figure 71 and Figure 72 The sliding member A221 includes a first abutting body A2211 and a locking protrusion A2212 connected to each other. In this embodiment, the first abutting body A2211 and the locking protrusion A2212 are integrally formed. In other embodiments, the first abutting body A2211 and the locking protrusion A2212 may also be independent components connected by means such as welding or riveting. The first abutting body A2211 has a first abutting inclined surface A2211a. The side of the first abutting body A2211 that connects to the locking protrusion A2212 is adjacent to the first abutting inclined surface A2211a. In this embodiment, the first abutting body A2211 is movably disposed in the movable groove A2251, and the locking protrusion A2212 is movably disposed in the movable hole A2242.

[0313] Further, please see Figures 69 to 72The locking mechanism A200 further includes a first reset member A240, which is adapted to apply force to the sliding member A221 so that the sliding member A221 always tends to move towards the locked position of the frame. In this embodiment, the first reset member A240 is a spring. In other embodiments, the first reset member A240 may also be an elastic column or other elastic component. One end of the first reset member A240 abuts against the second connecting seat A220, and the other end abuts against the sliding member A221. Specifically, one end of the first reset member A240 abuts against the bottom of the movable groove A2251, and the other end abuts against the first abutting body A2211. More specifically, the other end of the first reset member A240 abuts against the plane of the first abutting body A2211 that is opposite to the first abutting inclined surface A2211a. The plane of the first abutting body A2211 that is opposite to the first abutting inclined surface A2211a may also be provided with a guide portion A2211b, for example. The guide portion A2211b can be a cylindrical or semi-cylindrical structure. The other end of the first reset member A240 is located inside the guide portion A2211b to prevent the first reset member A240 from shifting during the extension and retraction process.

[0314] Further reading is available upon request. Figures 69 to 72 The locking mechanism A200 further includes a release element A250, which is adapted to be operated to drive the slider A221 to move towards the unlocking position of the frame. In this embodiment, the release element A250 is adapted to be operated to push the slider A221 to move towards the unlocking position of the frame. The release element A250 is movably disposed in the second connecting seat A220. Specifically, the release element A250 is movably disposed in the movable groove A2251. The release element A250 may specifically include a release portion A251 and abutting body A252. In this embodiment, the release portion A251 and the second abutting body A252 are integrally formed. In other embodiments, the release portion A251 and the second abutting body A252 may also be independent components connected by means such as welding or riveting. The release portion A251 is generally a flat plate structure. At least a portion of the release portion A251 can be exposed through the opening of the movable groove A2251 for operation. The second abutting body A252 is disposed on the side of the release part A251 facing the movable groove A2251. The second abutting body A252 has a second abutting inclined surface A2521. When the release member A250 is operated, its second abutting inclined surface A2521 pushes against the first abutting inclined surface A2211a, thereby causing the sliding member A221 to move towards the unlocking position of the frame. In this embodiment, the second abutting inclined surface A2521 is approximately located above the first abutting inclined surface A2211a. When the release member A250 is operated, the second abutting inclined surface A2521 moves downward (i.e., along) the first abutting inclined surface A2211a. Figure 69The first sliding direction F1 pushes against the first abutting inclined surface A2211a, causing the first abutting body A2211, together with the locking protrusion A2212, to move along the first sliding direction F1. This allows the locking protrusion A2212 to move towards the end of the movable hole A2242 away from the pivot axis O1, thereby allowing the locking protrusion A2212 to move out of the locking recess A2111 and slide along the main groove section A2110. Further, the release member A250 also includes a locking portion A253. The locking portion A253 is used to engage with the locking joint A400 (described later). The locking portion A253 is spaced apart from the second abutting body A252. The release member A250 may also include a connecting rod A254, which is used to connect the locking portion A253 and the release portion A251. In this embodiment, there are two connecting rods A254, spaced apart. Thus, the locking part A253, the unlocking part A251, and the two connecting rods A254 together form a through hole A255. When the unlocking part A251 can be operated to move towards the first connecting seat A210 (i.e., Figure 69 When the locking mechanism A200 moves in the second sliding direction F2), at least a portion of the first abutment body A2211 can pass through the through hole A255 to form a clearance, thereby further reducing the lateral dimension of the locking mechanism A200. In some embodiments, the snap-fit ​​portion A253 and / or the connecting rod A254 can be omitted.

[0315] Further reading is available upon request. Figures 69 to 72 The locking mechanism A200 also includes a cover A260, which covers the opening of the movable groove A2251 to prevent components such as the release element A250 and the sliding element A221 from slipping out of the movable groove A2251. The cover A260 has a first exposure hole A261 for exposing at least a portion of the release part A251. The cover A260 also has a second exposure hole A262 for exposing at least a portion of the engaging part A253.

[0316] Please see Figures 73 to 76 The frame A10 may also include a second frame A300. The second frame A300 is mounted on the first frame A100 and has an active state and a folded state. The frame A10 may also include a locking joint A400 (see...). Figure 77 Locking joint A400 is located on second frame A300. Second frame A300 can be operated to move locking joint A400 against sliding member A221 toward the unlocked position of frame.

[0317] Please continue reading Figures 73 to 76The locking joint A400 is switchable between a second locked state and a second unlocked state. When the locking joint A400 is in the second locked state, the second frame A300 is locked in the use state; when the locking joint A400 is in the second unlocked state, the second frame A300 can be operated to switch to the folded state. The second frame A300 can also move to the unlocked position by pushing the slider A221 against the locking joint A400. In this embodiment, as... Figure 73 and Figure 74 As shown, when the second frame A300 switches from the active state to the retracted state, the locking joint A400 does not release the locking mechanism A200, and the first frame A100 remains in the extended state. Figure 75 As shown, when the second frame A300, folded into its retracted state, is further operated or pivoted relative to the first frame A100 due to gravity, the locking joint A400, i.e., the locking and unlocking mechanism A200, allows the first frame A100 to be operated to switch from the unfolded state to the retracted state, as shown. Figure 76 As shown.

[0318] For details, please continue to see Figure 77 The second frame A300 includes a backrest A310 and a seat A320, which are pivotally connected to each other via a locking joint A400. The second frame A300 may also include an armrest A330. In this embodiment, the armrest A330 is connected to the seat A320. In this embodiment, the backrest A310 is generally a U-shaped frame structure, including a backrest crossbar A311 and two backrest side bars A312 connected to both ends of the backrest crossbar A311. The seat A320 is also generally a U-shaped frame structure, including a seat crossbar A321 and two seat side bars A322 connected to both ends of the seat crossbar A321. The second frame A300 may also include a reinforcing bar A323, which is connected between the two seat side bars A322 and spaced apart from the seat crossbar A321. In this embodiment, the reinforcing bar A323 is located behind the seat crossbar A321.

[0319] In this embodiment, as Figure 73 and Figure 74 As shown, when the second frame A300 switches from the active state to the folded state, it is the process of the backrest A310 gradually moving towards the seat A320. At this time, the relative position of the seat A320 and the first frame A100 does not change; the seat A320 is in the first rotation position relative to the first frame A100, while the first frame A100 is still in the extended state. When the second frame A300, folded to the folded state, is further operated or pivoted relative to the first frame A100 due to gravity, the seat A320 rotates relative to the first frame A100. When the seat A320 rotates relative to the first frame A100 to the second rotation position, as... Figure 75 As shown, at this time, locking joint A400 releases locking mechanism A200. For example, the rider frame A110 can be pushed, causing it to pivot and fold relative to the front wheel frame A120 and rear wheel frame A130, thereby allowing the first frame A100 to switch from an extended state to a folded state, as shown. Figure 76 As shown.

[0320] Please see also Figures 77 to 80 The structure and connection relationship of the second frame A300, specifically the backrest A310, seat A320, and locking joint A400 on one side along the left-right direction, will be described in detail below: The locking joint A400 includes a drive seat A410 and a pusher A420. The drive seat A410 is provided with a first pusher A411, and one end of the pusher A420 is provided with a first abutting part A421 that abuts against the first pusher A411. The other end of the pusher A420 is adapted to be driven to connect with the locking mechanism A200 to drive the locking mechanism A200 to switch to a first unlocking state. Specifically, the other end of the pusher A420 abuts against the unlocking member A250. The drive seat A410 can be operated to push the first abutment portion A421 through the first push portion A411, thereby driving the push member A420 to push the release member A250, which in turn causes the release member A250 to push the sliding member A221 to move towards the unlocking position of the frame (e.g. Figures 82 to 84(As shown). Further, the locking joint A400 may also include a first locking seat A430, a seat locking member A440, and a second locking seat A450. The first locking seat A430 has a first seat locking groove A431, and the second locking seat A450 has a second seat locking groove A451. The seat locking member A440 is switchable between a seat locking position and a seat unlocking position. In this embodiment, the seat locking member A440 is movably disposed between the first locking seat A430 and the second locking seat A450. The drive seat A410 also has a second pushing portion A412, and the seat locking member A440 has a second abutting portion A441. When the locking joint A400 is in the second unlocking state, the second frame A300 can be operated to drive the drive seat A410 to rotate. During the rotation of the drive seat A410, the second frame A300 switches from a used state to a retracted state. In this embodiment, the drive seat A410 is connected to one of the backrest side rods A312 of the backrest portion A310, and the first locking seat A430 is connected to one of the seat side rods A322 of the seat portion A320. Thus, when the locking joint A400 is in the second unlocked state, the backrest portion A310 can be subjected to an external force to pivot relative to the seat portion A320, at which time the drive seat A410 also rotates relative to the first locking seat A430. The drive seat A410 can also push against the first abutting portion A421 via the first pushing portion A411, thereby driving the pushing member A420 to push the unlocking member A250, causing the unlocking member A250 to push the sliding member A221 towards the unlocked position of the frame. The drive seat A410 can also push the second abutment part A441 through the second push part A412, thereby driving the seat locking member A440 to switch from the seat locking position to the seat unlocking position, so that the second frame A300 can pivot relative to the second locking seat A450. In this embodiment, the movement directions of the push part A420 and the seat locking member A440 are both approximately parallel to the pivot center O2 of the drive seat A410 and the second locking seat A450. The second locking seat A450 is detachably mounted on the two second connecting seats A220 of the two locking mechanisms A200 located on both sides of the first frame A100, thereby realizing a detachable connection between the second frame A300 and the first frame A100. Thus, the second frame A300 pivots relative to the second locking seat A450, that is, the second frame A300 pivots relative to the first frame A100. In this embodiment, the pivot center O2 and the pivot axis O1 are basically on the same straight line.

[0321] Please see also Figure 78 and Figure 79The drive seat A410 includes a back-to-back connecting portion A413 and a back-to-back pivot portion A414 that are interconnected. In this embodiment, the back-to-back connecting portion A413 and the back-to-back pivot portion A414 are integrally formed structures. In other embodiments, the back-to-back connecting portion A413 and the back-to-back pivot portion A414 may also be independent components connected by means such as welding or riveting. The back-to-back connecting portion A413 is adapted to be connected to the end of the back-to-back side rod A312 that is away from the back-to-back crossbar A311. In this embodiment, the back-to-back connecting portion A413 has a mounting groove A4131, and the end of the back-to-back side rod A312 that is away from the back-to-back crossbar A311 is inserted into the mounting groove A4131 of the back-to-back connecting portion A413 and connected to the back-to-back connecting portion A413 by fasteners such as screws. Of course, in other embodiments, the reverse can also be true, i.e., the end of the backrest side bar A312 away from the backrest cross bar A311 has a mounting groove, and the backrest connecting part A413 is inserted into the backrest side bar A312 and connected to the backrest side bar A312 by fasteners such as screws. The backrest pivot part A414 has a pivot recess A4140 approximately in its center. In this embodiment, the backrest pivot part A414 is approximately disc-shaped, so the pivot recess A4140 is approximately located at the center of the backrest pivot part A414. Of course, in other embodiments, the backrest pivot part A414 can also be any shape other than a disc-shaped structure, in which case the pivot recess A4140 can be approximately located at the geometric center of the backrest pivot part A414. The first pushing portion A411 is an arc-shaped protrusion centered on the pivot center O2 of the drive seat A410 and the second locking seat A450, and the side of the first pushing portion A411 facing the pushing member A420 forms a first pushing slope A4111. The second pushing portion A412 is an arc-shaped protrusion centered on the pivot center O2 of the drive seat A410 and the second locking seat A450, and the side of the second pushing portion A412 facing the seat locking member A440 forms a second pushing slope A4121. In this embodiment, there are two second pushing portions A412, which are approximately located on both sides of the pivot center O2 of the drive seat A410 and the second locking seat A450, and there is one first pushing portion A411, which is located on the side of the second pushing portion A412 closer to the pivot center O2. Specifically, both the first pushing part A411 and the second pushing part A412 are arc-shaped protrusions centered on the pivot center O2, and the first pushing part A411 is located inside the second pushing part A412. Further, the drive seat A410 also has a mounting protrusion A415 protruding from the outer periphery of the pivot part A414. In this embodiment, the mounting protrusion A415 is an arc-shaped protrusion along the outer periphery of the pivot part A414. A connecting hole A416 is provided on the side of the mounting protrusion A415 facing away from the pivot part A414, and this connecting hole A416 communicates with the mounting groove A4131.

[0322] Please see Figure 78The first locking seat A430 includes a seat connecting portion A432 and a seat pivot portion A433 connected to each other. In this embodiment, the seat connecting portion A432 and the seat pivot portion A433 are integrally formed. In other embodiments, the seat connecting portion A432 and the seat pivot portion A433 may also be independent components connected by means such as welding or riveting. The seat connecting portion A432 is adapted to be connected to the end of the seat side rod A322 away from the seat cross rod A321. In this embodiment, the seat connecting portion A432 is generally sleeve-shaped, and the end of the seat side rod A322 away from the seat cross rod A321 is inserted into the seat connecting portion A432 and connected to the seat connecting portion A432 by fasteners such as screws. Of course, in other embodiments, the configuration can be reversed, where the end of the seat side rod A322 away from the seat cross rod A321 is a sleeve-like structure, and the seat connecting part A432 is inserted into the seat side rod A322 and connected to the seat side rod A322 by fasteners such as screws. The seat pivot part A433 has a communicating groove A4330 approximately in its center, which extends through the seat pivot part A433 approximately in a left-right direction. In this embodiment, the seat pivot part A433 is approximately cylindrical, and the communicating groove A4330 is approximately concentrically arranged with the seat pivot part A433. Further, please refer to... Figure 81 The seat pivot portion A433 also has a backrest locking groove A4331 on its circumferential sidewall. In this embodiment, the backrest locking groove A4331 is connected to the connecting groove A4330. Of course, in other embodiments, the backrest locking groove A4331 and the connecting groove A4330 may not be connected. The locking joint A400 further includes a backrest locking member A460. In this embodiment, the backrest locking member A460 is a locking pin. At least a portion of the backrest locking member A460 is movably disposed on the backrest portion A310. Specifically, at least a portion of the backrest locking member A460 is movably disposed on one end of the backrest side rod A312 that is inserted into the mounting groove A4131. More specifically, one end of the backrest side rod A312 that is inserted into the mounting groove A4131 has a receiving cavity A3120, and at least a portion of the backrest locking member A460 is movably disposed within the receiving cavity A3120. The receiving cavity A3120 is opposite to and communicates with the communicating hole A416 on the mounting protrusion A415, and the back-locking groove A4331 is also connected to the communicating hole A416 on the mounting protrusion A415. The back-locking member A460 has a back-locking position and a back-unlocking position. When the back-locking member A460 is in the back-locking position, such as Figure 81As shown, at least a portion of the backrest locking member A460 is inserted into the backrest locking groove A4331 through the connecting hole A416, thereby fixing the drive seat A410 and the first locking seat A430 relative to each other, that is, fixing the backrest portion A310 and the seat portion A320 relative to each other, and fixing the included angle between the backrest portion A310 and the seat portion A320 relative to each other. When the backrest locking member A460 is in the backrest unlock position, the backrest locking member A460 exits the backrest locking groove A4331 through the connecting hole A416 and retracts into the receiving cavity A3120, then the drive seat A410 and the first locking seat A430 can rotate relative to each other, that is, the backrest portion A310 can fold closer to the seat portion A320. In some embodiments, there may be at least two backrest locking grooves A4331, and the at least two backrest locking grooves A4331 are circumferentially spaced along the pivot center O2 of the drive seat A410 and the first backrest locking groove A4331. In this embodiment, there are three backrest locking slots A4331. Thus, by inserting the backrest locking member A460 into different backrest locking slots A4331, the drive seat A410 can be locked in different relative positions relative to the first locking seat A430, allowing the backrest portion A310 to be fixed at different tilt angles relative to the seat portion A320, thereby meeting the seating needs of different age groups and usage scenarios. Furthermore, an elongated groove A435 is formed on the circumferential sidewall of the seat pivot portion A433, and the sidewall recess within the elongated groove A435 forms the aforementioned at least two backrest locking slots A4331. Furthermore, a first seat locking slot A431 is provided on the side of the first locking seat A430 facing away from the drive seat A410. The first seat locking slot A431 can be, for example, a serrated groove circumferentially arranged around the connecting groove A4330.

[0323] Please see Figures 78 to 80The second locking seat A450 is located on the side of the first locking seat A430 facing away from the drive seat A410. The side of the second locking seat A450 facing the first locking seat A430 has a pivoting protrusion A452. The pivoting protrusion A452 passes through the communicating groove A4330 of the first locking seat A430 and is inserted into the pivoting recess A4140 of the drive seat A410, thereby achieving a pivot connection between the drive seat A410, the first locking seat A430, and the second locking seat A450. The side of the second locking seat A450 facing the first locking seat A430 also has a second seat locking groove A451. In this embodiment, the second seat locking groove A451 is also a serrated groove arranged approximately circumferentially along the pivoting center O2 of the drive seat A410, the first locking seat A430, and the second locking seat A450; that is, the second seat locking groove A451 is a serrated groove arranged approximately circumferentially along the pivoting protrusion A452. The side of the second locking seat A450 facing the first locking seat A430 is also provided with a push hole A453, which is used for the push member A420 to extend out. In this embodiment, there are two push holes A453. In other embodiments, the number of push holes A453 can also be adjusted as needed. In this embodiment, the side of the second locking seat A450 facing the first locking seat A430 is provided with a convex ring A454. The second seat locking groove A451 mentioned above is provided along the inner peripheral wall of the convex ring A454, and the pivot protrusion A452 mentioned above is located approximately at the center of the convex ring A454. The side of the first locking seat A430 facing the second locking seat A450 may also be provided with an annular embedding groove A434, which is concentrically arranged with the communicating groove A4330. Specifically, the embedding groove A434 is provided on the outer peripheral side of the first seat locking groove A431 and communicates with the first seat locking groove A431. When the drive seat A410, the first locking seat A430, and the second locking seat A450 are pivotally connected, the second locking seat A450 covers one side of the first locking seat A430, and the protruding ring A454 of the second locking seat A450 receives the fitting groove A434 of the first locking seat A430. The drive seat A410 covers the other side of the first locking seat A430, and the mounting protrusion A415 of the drive seat A410 covers at least a portion of the circumferential sidewall of the first locking seat A430 and closes the elongated groove A435 of the first locking seat A430. In this way, the drive seat A410, the first locking seat A430, and the second locking seat A450 together form a second accommodating space A401.

[0324] Please see Figure 78 and Figure 79The seat locking element A440 is movably disposed within the second accommodating space A401, specifically, the seat locking element A440 is located between the first locking seat A430 and the second locking seat A450. The seat locking element A440 is switchable between a seat locked position and a seat unlocked position. When the seat locking element A440 is in the seat locked position, such as... Figure 82 As shown, the seat locking component A440 is simultaneously positioned between the first seat locking groove A431 and the second seat locking groove A451, making the first locking seat A430 and the second locking seat A450 relatively fixed, that is, the second frame A300 cannot rotate relative to the first frame A100. When the seat locking component A440 is in the seat unlock position, as... Figure 84 As shown, the seat locking member A440 is located only within the first seat locking groove A431 or the second seat locking groove A451 (the second seat locking groove A451 in this embodiment), allowing the first locking seat A430 and the second locking seat A450 to rotate relative to each other, i.e., the second frame A300 can rotate relative to the first frame A100. In this embodiment, the seat locking member A440 is a gear that can engage with the first seat locking groove A431 and the second seat locking groove A451. The side of the seat locking member A440 facing the first locking seat A430 is provided with a second abutting portion A441. The side of the second abutting portion A441 facing the first locking seat A430 forms a third abutting inclined surface A4412. The third abutting inclined surface A4412 is adapted to abut against the second pushing inclined surface A4121. The seat locking member A440 also has a first through hole A442. The seat locking member A440 is fitted onto the pivot protrusion A452 of the second locking seat A450 through a first through hole A442. Specifically, the first through hole A442 may be located at the center of the seat locking member A440. The second abutment portion A441 is an arc-shaped protrusion centered on the first through hole A442. Furthermore, the seat locking member A440 also has a through hole A443 for at least a portion of the pushing member A420 to pass through.

[0325] Please continue reading Figure 77 , Figure 78 and Figure 82The pusher A420 is movably disposed within the second accommodating space A401. The pusher A420 includes a sleeve portion A422 and a pusher protrusion A423 connected to each other. In this embodiment, the sleeve portion A422 and the pusher protrusion A423 are integrally formed. In other embodiments, the sleeve portion A422 and the pusher protrusion A423 may also be independent components connected by means such as welding or riveting. The sleeve portion A422 can generally be a ring-shaped structure, and a pusher protrusion A423 protrudes from one side of the sleeve portion A422. In this embodiment, there are two pusher protrusions A423, which are spaced apart. In other embodiments, the number of pusher protrusions A423 may be adjusted as needed. The side of the sleeve portion A422 facing away from the pusher protrusion A423 is provided with the first abutting portion A421 described above. The first abutting portion A421 is adapted to abut against the first pusher inclined surface A4111. Specifically, please refer to Figure 82 The sleeve portion A422 is located on the side of the seat locking member A440 facing the first locking seat A430, and the sleeve portion A422 is movably disposed in the communicating groove A4330 of the first locking seat A430. The push protrusion A423 is adapted to pass through the through hole A443 of the seat locking member A440 and be inserted into the push hole A453 of the second locking seat A450. When the locking joint A400 is in the second unlocking state, the second frame A300 can be operated to drive the drive seat A410 to rotate. The drive seat A410 pushes the first abutting portion A421 through the first push portion A411, thereby driving the push protrusion A423 of the push member A420 to extend through the push hole A453 and push the unlocking member A250, thereby the unlocking member A250 pushes the sliding member A221 to move towards the unlocking position of the frame.

[0326] Further, please see Figure 80 The locking joint A400 may further include a second reset member A470, which is adapted to apply force to the seat locking member A440 so that the seat locking member A440 always tends to move towards the seat locking position. In this embodiment, the second reset member A470 is a spring. In other embodiments, the second reset member A470 may also be an elastic column or other elastic component. In this embodiment, the second reset member A470 is sleeved on the pivot protrusion A452 and its two ends abut against the second locking seat A450 and the seat locking member A440, respectively. Thus, when the second frame A300 (specifically the seat part A320) returns to the first rotational position relative to the first frame A100 from the second rotational position, the seat locking member A440 can gradually return to the seat locking position under the elastic restoring force of the second reset member A470, thereby fixing the seat part A320 relative to the first frame A100.

[0327] Furthermore, such as Figure 81As shown, the second frame A300 may further include a release mechanism A340, which is used to engage with the back-locking member A460 to drive the back-locking member A460 from the back-locking position to the back-release position, thereby switching the locking joint A400 from the second locked state to the second released state. The release mechanism A340 can take various forms. In this embodiment, the release mechanism A340 may include, for example, a release operation member A341, a release drive member A342, and a traction member A343. The release operation member A341 may be, for example, an operating handle located on the backrest portion A310 (specifically, the backrest crossbar A311). The release operation member A341 is provided with drive ribs A3411. In this embodiment, there are two drive ribs A3411, symmetrically arranged along the left-right direction of the second frame A300. In this embodiment, the two drive ribs A3411 are inclined towards each other. The first ends A3411a of the two drive ribs A3411 are close to each other, while the second ends A3411b of the two drive ribs A3411 are far apart. The release drive member A342 is provided with drive slots A3421 for the drive ribs A3411 to insert into, and one end of the release drive member A342 is connected to the traction member A343, while the other end of the traction member A343 is linked to the back-locking member A460. In this embodiment, there are two release drive members A342, and the drive slots A3421 of the two release drive members A342 are respectively used for the two drive ribs A3411 of the release operation member A341 to insert into. The two drive slots A3421 are inclined towards each other, and the first slot ends (not shown in the figure) of the two drive slots A3421 are close to each other, while the second slot ends (not shown in the figure) of the two drive slots A3421 are far apart. When the release operating member A341 rotates along the third rotation direction R3, the release operating member A341 can drive the two release driving members A342 to move towards each other through the pushing action of the groove walls of the two driving ribs A3411 and the two driving grooves A3421. There are also two traction members A343. One end of the two traction members A343 is connected to the two release driving members A342 respectively, and the other end of the two traction members A343 is linked to the back locking member A460 of the two locking joints A400 respectively. Thus, when the release operating member A341 rotates along the third rotation direction R3, the release operating member A341 can drive the two release driving members A342 to move towards each other along the fourth sliding direction F4 through the pushing action of the groove walls of the two driving ribs A3411 and the two driving grooves A3421. The two release driving members A342 then drive the two back-to-back locking members A460 to move upward along the back-to-back side rod A312 through the two traction members A343 respectively (i.e., along the...). Figure 81 The fifth sliding direction (F5) moves, thereby releasing the two locking joints A400.

[0328] In this embodiment, as Figure 81As shown, the receiving cavity A3120 extends through the entire backrest portion A310, meaning the backrest portion A310 has a U-shaped tubular structure. Specifically, the two backrest side bars A312 and the backrest crossbar A311 each have a receiving cavity A3120 that is interconnected. The release drive component A342 and the traction component A343 are both located within this receiving cavity A3120. A portion of the release operation component A341 is located outside the receiving cavity A3120 for operation, while the other portion extends into the receiving cavity A3120 to abut against the release drive component A342. This design makes the overall appearance of the frame A10 more concise and aesthetically pleasing.

[0329] Furthermore, such as Figure 81 As shown, the release mechanism A340 may further include a third reset member A344, which is adapted to apply force to the back-locking member A460 so that it always tends to move towards the back-locking position. In this embodiment, the third reset member A344 is a spring. In other embodiments, the third reset member A344 may also be an elastic column or other elastic component. The release mechanism A340 may further include a connecting member A345, which is connected to the back-locking member A460. The connecting member A345 may, for example, be disposed in the receiving cavity A3120 of the back-side rod A312, with one end of the back-locking member A460 connected to the connecting member A345, and the other end extending through the slot of the receiving cavity A3120. In this embodiment, the back-locking member A460 is connected to the bottom end of the connecting member A345. The connecting member A345 is provided with a strip groove A3451. A strip groove A3451 is generally located in the middle of the connector A345 and extends along the length of the back-locking member A460. A third reset member A344 is located within the strip groove A3451, with both ends abutting against the connector A345 and the back-side rod A312, respectively. Specifically, the bottom of the strip groove A3451 has a sliding hole A3452 that communicates with the receiving cavity A3120, and the sliding hole A3452 also extends roughly along the length of the back-locking member A460. A push-protrusion A3121 is provided on the side wall of the receiving cavity A3120, and the push-protrusion A3121 passes through the sliding hole A3452. One end of the third reset member A344 abuts against the bottom of the receiving cavity A3120, and the other end abuts against the push-protrusion A3121. In this embodiment, the third reset member A344 is adapted to apply force to the back-locking member A460 through the connecting member A345, so that it always tends to move towards the back-locking position. Specifically, the third reset member A344 is adapted to apply force to the connecting member A345, so that the connecting member A345 drives the back-locking member A460 to always tend to move towards the back-locking position, that is, to move in the opposite direction of the fifth sliding direction F5. The other end of the traction member A343 is connected to the top end of the connecting member A345, that is, the other end of the traction member A343 is connected to the back-locking member A460 through the connecting member A345.

[0330] The following describes the folding process of the A10 frame using the structure on one side along the left-right direction as an example:

[0331] When the A10 frame needs to be folded down, such as Figure 81 As shown, firstly, the release operation member A341 is rotated along the third rotation direction R3. The release operation member A341, through the pushing action of its drive rib A3411 and the groove wall of drive groove A3421, drives two release drive members A342 to move towards each other along the fourth sliding direction F4. One of the release drive members A342, through its corresponding traction member A343, drives the connecting member A345 to move upward along the fifth sliding direction F5. Simultaneously, the connecting member A345 drives the connected backrest locking member A460 from the backrest locking position to the backrest release position, i.e., the backrest locking member A460 moves out of the backrest locking groove A4331, the locking joint A400 is released, and the third reset member A344 is compressed and deformed. At this time, the backrest part A310 can be pushed along the fourth rotation direction R4, causing the backrest part A310 to retract towards the seat part A320, i.e., the second frame A300... Figure 73 The displayed state gradually switches to Figure 74 The state shown. During this process, as... Figure 79 and Figure 80 As shown, during rotation, the backrest A310 also pushes the second abutment portion A441 of the seat locking member A440 via the second pushing portion A412 of the drive seat A410, causing the seat locking member A440 to move along the second sliding direction F2 from... Figure 82 The seat locking position shown is moved to Figure 83 The seat is in the unlocked position shown, at which point the seat portion A320 of the second frame A300 can rotate relative to the first frame A100. For example... Figures 74 to 75 As shown, during the process of the seat part A320 rotating from the first rotation position to the second rotation position along the fourth rotation direction R4, the first pushing part A411 and the first abutting part A421 gradually switch from a mutually offset state to a mutually abutting state. That is, the drive seat A410 gradually drives the pushing member A420 along the direction of rotation through the abutting of the first pushing part A411 and the first abutting part A421. Figure 83 The second sliding direction F2 moves, causing the pushing protrusion A423 of the pushing member A420 to pass through the pushing hole A453 and push against the releasing member A250 of the locking mechanism A200. For example... Figures 83 to 84 As shown, the unlocking member A250 is pushed by the pushing member A420 and moves along the second sliding direction F2. Simultaneously, its second abutting inclined surface A2521 pushes against the first abutting inclined surface A2211a, causing the sliding member A221 to move along the first sliding direction F1. When the sliding member A221 moves from the frame locking position to the frame unlocking position, that is, when the sliding member A221 moves from the first locking recess A2111a (see...)... Figure 67Removed from the main slot, the sliding member A221 can slide along the main slot section A2110, and the locking mechanism A200 switches from the first locked state to the first unlocked state. That is, the first connecting seat A210 and the second connecting seat A220 of the locking mechanism A200 can rotate relative to each other, that is, the rider frame A110 can rotate relative to the front wheel frame A120 and the rear wheel frame A130. At this time, the rider frame A110 can be pushed in the opposite direction of the fourth direction R4 (or under the gravity of the second frame A300), and the rider frame A110 will move towards the front wheel frame A120 and the rear wheel frame A130 and fold down. At the same time, the rear wheel frame A130 is driven to move towards the front wheel frame A120 and fold down through the linkage frame A140. That is, the first frame A100 switches from the unfolded state to the folded state. Figure 76 As shown. Figure 78 and Figure 79 As shown, after the slider A221 is folded into place, the second pushing slope A4121 of the drive seat A410 gradually passes over the third abutting slope A4412 of the seat locking member A440, causing the seat locking member A440 to gradually move in the opposite direction of the second sliding direction F2 under the elastic restoring force of the second reset member A470. When the seat locking member A440 moves from the seat locking position to the seat unlocking position, that is, when the seat locking member A440 is once again located between the first seat locking groove A431 and the second seat locking groove A451, the relative position between the seat part A320 and the first frame A100 is re-locked, as shown. Figure 76 As shown, the seat portion A320 is locked in the third rotational position relative to the first frame A100. Since the pusher A420 passes through the pusher protrusion A423 into the seat locking member A440, the side of the seat locking member A440 facing the first locking seat A430 simultaneously pushes against the sleeve portion A422 of the pusher A420. This causes the pusher A420 to move along the opposite direction of the second sliding direction F2 until it is spaced apart from the release member A250. That is, the release member A250 is no longer subjected to the pushing force of the pusher A420, and therefore the slider A221 is no longer subjected to the pushing force of the release member A250. Under the action of the first reset member A240, the slider A221 moves along the opposite direction of the first sliding direction F1 to the frame locking position. At this point, since the first frame A100 is in the folded state, the locking protrusion A2212 of the slider A221 moves along the guide rail A211 from the unfolded locking position to the folded locking position, and the locking protrusion A2212 engages with the second locking recess A2111b. This completes the overall folding of the frame A10.

[0332] like Figure 65As shown, the second frame A300 and the first frame A100 are detachably connected, facilitating different usage scenarios for the frame A10. For example, the second frame A300 can be detached, and the infant carrier can be installed on the first frame A100 for use by young infants. Of course, in other embodiments, the second frame A300 and the first frame A100 can be non-detachably connected. In this embodiment, the second frame A300 is detachably installed on the first frame A100 via a detachable connection between the locking joint A400 and the locking mechanism A200. Specifically, the second locking seat A450 of the locking joint A400 is detachably connected to the second connecting seat A220 of the locking mechanism A200. See also... Figure 72 The seat mounting portion A225 of the second connecting seat A220 is provided with a mating protrusion A2252, and the aforementioned movable groove A2251 is disposed on the mating protrusion A2252. The seat mounting portion A225 is also provided with a first engaging portion A2253, which in this embodiment is an engaging hole. Please continue to see Figure 77 and Figure 78 The second locking seat A450, on the side facing away from the first locking seat A430, is also provided with a mating recess A455. This mating recess A455 is used to engage with the mating protrusion A2252 of the second connecting seat A220. In this embodiment, the pushing hole A453 is located within the mating recess A455. The locking joint A400 also includes a locking mechanism A480. The locking mechanism A480 includes a second locking portion A481. The second locking portion A481 is used to engage with the first locking portion A2253. In this embodiment, the second locking portion A481 is a retractable locking hook disposed on the second locking seat A450. Specifically, the second locking seat A450 has a receiving cavity A457 (see...). Figure 82 The second locking seat A450 has a locking port A458 communicating with the receiving cavity A457 on its side opposite to the first locking seat A430. The second locking portion A481 can selectively extend out of the receiving cavity A457 through the locking port A458 to engage with the first locking portion A2253 of the second connecting seat A220, or retract into the receiving cavity A457 through the locking port A458 to disengage from the first locking portion A2253 of the second connecting seat A220. The locking mechanism A480 may also include, for example, a disassembly operation member A482, which can be operated to disengage the second locking portion A481 from the first locking portion A2253. Figure 82As shown, the engaging mechanism A480 may further include a fourth reset member A483, which is adapted to apply force to the second engaging portion A481 so that it extends through the engaging port A458 into the receiving cavity A457 to engage with the first engaging portion A2253 of the second connecting seat A220. In this embodiment, the fourth reset member A483 is a spring. In other embodiments, the fourth reset member A483 may also be an elastic post or other elastic component. In this embodiment, one end of the fourth reset member A483 abuts against the second engaging portion A481, and the other end abuts against the second locking seat A450. Further, as Figure 77 and Figure 82 As shown, the side of the second locking seat A450 facing the first locking seat A430 is also provided with a locking groove A459. When the releasing member A250 is not pushed by the pushing member A420 and the seat part A320 is in the first rotation position, the locking part A253 of the releasing member A250 is inserted into the locking groove A459, so that the connection between the locking mechanism A200 and the locking joint A400 (or the second frame A300 and the first frame A100) is more secure. When the releasing member A250 is pushed by the pushing member A420 and the seat part A320 rotates to the second rotation position, as... Figure 84 As shown, the locking part A253 of the release member A250 moves out of the locking groove A459 so that the locking mechanism A200 and the locking joint A400 (or the second frame A300 and the first frame A100) can rotate relative to each other.

[0333] It should be understood that the aforementioned second frame A300 may have a forward-facing position relative to the first frame A100 (e.g., Figure 73 The forward and rearward positions (not shown in the attached diagram) correspond to whether the infant or toddler riding in the second frame A300 is facing forward or backward from the direction the stroller is moving. Regardless of whether the second frame A300 is in the forward or rearward position, the second frame A300 can switch between the open and folded states, and the first frame A100 can also switch between the unfolded and folded states.

[0334] like Figure 85 As shown, another embodiment of the present invention provides an infant stroller, which also includes a foldable frame A10 and a seat cover (not shown in the figures) covering the frame A10. During the folding process, the locking mechanism A200 of the frame A10 and the second frame A300 of the stroller does not release; the locking mechanism A200 is released only by actively operating the folding operation component A402, thereby achieving the coordinated folding of the first frame A100.

[0335] like Figure 85As shown, the frame A10 includes a first frame A100 and a locking mechanism A200. The structure and connection relationship of the first frame A100 and the locking mechanism A200 in this embodiment are basically the same as those in the previous embodiment, and will not be described again here.

[0336] Please see Figure 85 and Figure 86 The frame A10 may further include a second frame A300. The second frame A300 is mounted on the first frame A100 and has a used state and a folded state. The frame A10 may further include a locking joint A400. The locking joint A400 is disposed on the second frame A300. The second frame A300 can be operated to move the locking joint A400 against the sliding member A221 to the unlocked position of the frame. In this embodiment, the structure and connection relationship of the second frame A300 are basically the same as those in the previous embodiment, and will not be described again here. The main difference between this embodiment and the previous embodiment lies in the locking joint A400.

[0337] Please continue reading Figures 87 to 91 Similar to the previous embodiment, the locking joint A400 is switchable between a second locked state and a second unlocked state. When the locking joint A400 is in the second locked state, the second frame A300 is locked in the use state; when the locking joint A400 is in the second unlocked state, the second frame A300 can be operated to switch to the retracted state. The second frame A300 can also move to the unlocked position by pushing the slider A221 against the locking joint A400. In this embodiment, as... Figure 89 and Figure 90 As shown, when the second frame A300 switches from the active state to the retracted state, the locking joint A400 does not release the locking mechanism A200, and the first frame A100 remains in the extended state. When the second frame A300 is in the retracted state, by operating the retracting operation component A402 (described later) to drive the drive component A490 (described later) to move further, the locking joint A400, i.e., the locking mechanism A200, releases, and the first frame A100 can be operated to switch from the extended state to the folded state, as shown. Figure 91 and Figure 92 As shown.

[0338] Similar to the previous embodiment, please continue to refer to... Figure 86The second frame A300 includes a backrest A310 and a seat A320, which are pivotally connected to each other via a locking joint A400. The second frame A300 may also include an armrest A330. In this embodiment, the backrest A310 is generally a U-shaped frame structure, including a backrest crossbar A311 and two backrest side bars A312 connected to both ends of the backrest crossbar A311. The seat A320 is also generally a U-shaped frame structure, including a seat crossbar A321 and two seat side bars A322 connected to both ends of the seat crossbar A321. The second frame A300 may also include a reinforcing bar A323, which is connected between the two seat side bars A322 and spaced apart from the seat crossbar A321. In this embodiment, the reinforcing bar A323 is located behind the seat crossbar A321.

[0339] In this embodiment, as Figure 89 and Figure 90 As shown, when the second frame A300 switches from the active state to the folded state, the backrest A310 gradually moves closer to the seat A320. At this time, the relative position of the seat A320 and the first frame A100 does not change, and the seat A320 is in the first rotation position relative to the first frame A100, while the first frame A100 is still in the extended state. At this time, the folding operation component A402 (described later) can be operated to drive the drive component A490 (described later) to move further, locking the joint A400, i.e., releasing the locking mechanism A200. The first frame A100 can then be operated to switch from the extended state to the folded state, and at the same time, the second frame A300 can also rotate relative to the first frame A100 from the first rotation position to the second rotation position.

[0340] Please see also Figure 93 and Figure 94 The structure and connection relationship of the second frame A300, specifically the backrest A310, seat A320, and locking joint A400 on one side along the left-right direction, will be described below: The locking joint A400 may include, for example, a drive seat A410, a drive member A490, a first push member A424, and a seat locking member A440. The drive member A490 is pivotally connected to the drive seat A410 and has a first drive portion A491. The first push member A424 is mounted on the drive seat A410 and rotates with the drive seat A410, and has a first push portion A4241 that can abut against the first drive portion A491. The seat locking member A440 is used for a drive connection with the locking mechanism A200. When the second frame A300 is in the retracted state, the drive member A490 is adapted to be operated to push the first push member A4241 through the first drive part A491, thereby driving the seat locking member A440 to drive the locking mechanism A200 to switch to the first unlocking state.

[0341] For details, please continue to see Figure 93 and Figure 94 The drive member A490 and the drive seat A410 can be pivotally connected, for example, via a pivot shaft (not shown in the figures). Similar to the previous embodiment, the drive seat A410 includes a back-to-back connecting portion A413 and a back-to-back pivot portion A414 connected to each other. In this embodiment, the back-to-back connecting portion A413 has a mounting groove A4131, and one end of the back-to-back side rod A312, away from the back-to-back crossbar A311, is inserted into the mounting groove A4131 of the back-to-back connecting portion A413 and connected to the back-to-back connecting portion A413 by fasteners such as screws. Of course, in other embodiments, the configuration can be reversed, i.e., one end of the back-to-back side rod A312, away from the back-to-back crossbar A311, has a mounting groove A4131, and the back-to-back connecting portion A413 is inserted into the back-to-back side rod A312 and connected to the back-to-back side rod A312 by fasteners such as screws. A second pivot hole A4141 is provided approximately in the middle of the back-to-back pivot portion A414. In this embodiment, the back-mounted pivot portion A414 is generally a disc-shaped structure, so the second pivot hole A4141 is approximately located at the center of the back-mounted pivot portion A414. Of course, in other embodiments, the back-mounted pivot portion A414 can also be any shape other than a disc-shaped structure, in which case the second pivot hole A4141 can be approximately located at the geometric center of the back-mounted pivot portion A414. The back-mounted pivot portion A414 has a first guide hole A4142. In this embodiment, the pivot axis extends along the direction of the pivot center O2. The first guide hole A4142 is an arc-shaped hole centered on the pivot center O2 (or pivot axis) of the drive member A490 and the drive seat A410. For example, there can be two arc-shaped holes, symmetrically arranged relative to the pivot center O2 (or pivot axis).

[0342] For details, please continue to see Figure 93 and Figure 94 The driving member A490 is generally disc-shaped, with a first pivot hole A492 located approximately in the center. A pivot shaft passes through the second pivot hole A4141 and the first pivot hole A492 to achieve a pivotal connection between the driving seat A410 and the driving member A490. A first pusher A424 is disposed between the driving member A490 and the driving seat A410. As mentioned above, the side of the driving member A490 facing the first pusher A424 has a first driving portion A491. In this embodiment, the first driving portion A491 is an arc-shaped protrusion surrounding the first pivot hole A492. The side of the first driving portion A491 facing the first pusher A424 forms a first pushing slope A4911.

[0343] For details, please continue to see Figure 93 and Figure 94The first pusher A424 has a first through hole A4243 formed approximately in its center. The drive seat A410, facing the drive member A490, has a first pivot cylinder A4143. The first pivot cylinder A4143 communicates with a second pivot hole A4141. The first pusher A424 is fitted over the first pivot cylinder A4143 through its first through hole A4243. The pivot shaft passes sequentially through the second pivot hole A4141, the first pivot cylinder A4143, and the first pivot hole A492 to achieve a pivotal connection between the drive seat A410 and the drive member A490. As mentioned earlier, the first pusher A424 has a first push portion A4241 that abuts against the first drive portion A491. In this embodiment, the first push portion A4241 is an arc-shaped protrusion surrounding the first pivot hole A492. The side of the first pushing part A4241 facing the drive member A490 forms a second pushing slope A4244. Further, the side of the first pushing member A424 facing the drive seat A410 also has a second pushing part A4242. The drive seat A410 can be operated to rotate the first pushing member A424 and push the seat locking member A440 from the seat locked position to the seat unlocked position via the second pushing part A4242. When the second frame A300 is in the retracted state, the drive member A490 can be operated to push the first pushing part A4241 via the first drive part A491, thereby moving the first pushing member A424, and pushing the seat locking member A440 via the second pushing part A4242, so that the seat locking member A440 moves together. In this embodiment, the second pushing part A4242 is an arc-shaped protrusion approximately centered on the first pivot hole A492. For example, there can be two second pushing portions A4242, which are symmetrically arranged relative to the first pivot hole A492. The second pushing portions A4242 pass through the first guide hole A4142 abutting against the seat locking member A440. In this embodiment, the two second pushing portions A4242 pass through the two first guide holes A4142 respectively to push against the seat locking member A440.

[0344] Further reading is available upon request. Figure 93 and Figure 94The locking joint A400 also includes a first locking seat A430 and a second locking seat A450 pivotally connected to each other. Similar to the previous embodiment, the seat locking member A440 is disposed between the first locking seat A430 and the second locking seat A450, and is switchable between a seat locking position and a seat unlocking position. When the seat locking member A440 is in the seat locking position, the first locking seat A430 and the second locking seat A450 are relatively fixed; when the seat locking member A440 is in the seat unlocking position, the first locking seat A430 and the second locking seat A450 can rotate relative to each other. A third through hole A444 is provided approximately in the center of the seat locking member A440. A push protrusion A445 is provided on the side of the seat locking member A440 facing the second locking seat A450. In this embodiment, there are two push protrusions A445, which are arranged opposite to the third through hole A444. The structure of the second locking seat A450 in this embodiment is basically similar to that of the second locking seat A450 in the previous embodiment. The second locking seat A450 in this embodiment also has a push hole A453 that is opposite to the push protrusion A445. For example, there can be two push holes A453, which are respectively opposite to two push protrusions A445. When the second frame A300 is in the retracted state, the drive member A490 is adapted to be operated to push the first push part A4241 through the first drive part A491, thereby driving the seat locking member A440 to move so that the push protrusion A445 passes through the push hole A453 and pushes the locking mechanism A200 to switch to the first unlocking state.

[0345] Please continue reading Figure 93 and Figure 94Similar to the previous embodiment, the first locking seat A430 is provided with a first seat locking groove A431, and the second locking seat A450 is provided with a second seat locking groove A451. The seat locking member A440 is switchable between a seat locking position and a seat unlocking position. In this embodiment, the seat locking member A440 is movably disposed between the first locking seat A430 and the second locking seat A450. When the seat locking member A440 is in the seat locking position, the seat locking member A440 is simultaneously located in the first seat locking groove A431 and the second seat locking groove A451, so that the first locking seat A430 and the second locking seat A450 are relatively fixed. When the seat locking member A440 is in the seat unlocking position, the seat locking member A440 is located only in the first seat locking groove A431 or the second seat locking groove A451 (in this embodiment, the seat locking member A440 is only located in the second seat locking groove A451), so that the first locking seat A430 and the second locking seat A450 can pivot relative to each other. The first locking seat A430 may be located, for example, between the drive seat A410 and the second locking seat A450, and the first locking seat A430 is pivotally connected to the drive seat A410. In this embodiment, the drive seat A410 is connected to one of the backrest side rods A312 of the backrest portion A310, and the first locking seat A430 is connected to one of the seat side rods A322 of the seat portion A320. Thus, when the locking joint A400 is in the second unlocked state, the backrest portion A310 can be subjected to external force to pivot and retract relative to the seat portion A320.

[0346] Please continue reading Figure 93 and Figure 94Similar to the previous embodiment, the first locking seat A430 includes a seat connecting portion A432 and a seat pivot portion A433 connected to each other. In this embodiment, the seat connecting portion A432 and the seat pivot portion A433 are integrally formed. In other embodiments, the seat connecting portion A432 and the seat pivot portion A433 can also be independent components connected by means such as welding or riveting. The seat connecting portion A432 is adapted to be connected to the end of the seat side rod A322 away from the seat cross rod A321. In this embodiment, the seat connecting portion A432 is generally in the form of a sleeve, and the end of the seat side rod A322 away from the seat cross rod A321 is inserted into the seat connecting portion A432 and connected to the seat connecting portion A432 by fasteners such as screws. Of course, in other embodiments, the configuration can be reversed, where the end of the seat side rod A322 away from the seat cross rod A321 is a sleeve-like structure, and the seat connecting part A432 is inserted into the seat side rod A322 and connected to the seat side rod A322 by fasteners such as screws. The structure of the second locking seat A450 is basically the same as that of the second locking seat A450 in the previous embodiment, and will not be described again here. In this embodiment, the first seat locking groove A431 and the second seat locking groove A451 can both be gear grooves, for example, and the seat locking member A440 is a gear that can engage with the first seat locking groove A431 and the second seat locking groove A451.

[0347] Further, please see Figures 93 to 95The locking joint A400 may further include, for example, a second pusher A425. The second pusher A425 is disposed between the seat lock A440 and the first locking seat A430. One side of the second pusher A425 abuts against the second push portion A4242, and the other side of the second pusher A425 abuts against the seat lock A440. Thus, when the second frame A300 is in the retracted state, the drive member A490 can be operated to push the first push portion A4241 through its first drive portion A491, thereby pushing the first pusher A424 to move in a direction parallel to the pivot axis, and the first pusher A424 pushes the second pusher A425 through its second push portion A4242, so that the second pusher A425 moves in the same direction to push the seat lock A440 to move together. Specifically, the second pusher A425 can be, for example, a gear-shaped sheet structure. The shape of the second pusher A425 is adapted to the shape of the first seat locking groove A431 so that the second pusher A425 can be accommodated in the first seat locking groove A431 and move in a direction parallel to the pivot axis. The first locking seat A430 has a second guide hole A4332, and the second pusher A425 has a push post A4251. The second push portion A4242 of the first pusher A424 passes through the first guide hole A4142 between the drive seat A410 and the first locking seat A430, and the push post A4251 of the second pusher A425 passes through the second guide hole A4332 to abut against the second push portion A4242. In this embodiment, the second pusher A425 may have two push posts A4251, which are symmetrically arranged relative to the second through hole A4252 of the second pusher A425. Correspondingly, there are also two second guide holes A4332, which are arranged opposite to the third pivot hole A4334 of the first locking seat A430. In this embodiment, the cross-sectional area of ​​the first guide hole A4142 is smaller than that of the second guide hole A4332, and the first guide hole A4142 always coincides with at least a portion of the second guide hole A4332. This ensures that during the pivoting of the drive seat A410 relative to the first locking seat A430, the second push portion A4242 of the first pusher A424 can always abut against the push post A4251 of the second pusher A425. In this embodiment, the second pushing part A4242 is an arc-shaped protrusion, and the first guide hole A4142 is an arc-shaped hole adapted to the shape of the second pushing part A4242. The pushing column A4251 is cylindrical, and the second guide hole A4332 is a circular hole adapted to the pushing column A4251. Of course, in other embodiments, the number, shape, and position of the pushing column A4251 and the second guide hole A4332 can also be adjusted as needed.

[0348] In an embodiment not shown, the second pusher A425 may also be omitted, and the pusher column A4251 may be directly disposed on the side of the seat locking member A440 facing the first locking seat A430, for example.

[0349] Further reading is available upon request. Figure 93 and Figure 94 The locking joint A400 may further include, for example, a second reset member A470. The second reset member A470 is adapted to apply force to the seat locking member A440 to move the seat locking member A440 towards the seat locking position. In this embodiment, the second reset member A470 is a spring. One end of the second reset member A470 abuts against the second locking seat A450, and the other end of the second reset member A470 abuts against the seat locking member A440. Specifically, the side of the first locking seat A430 facing the second locking seat A450 is provided with a second pivot cylinder A4333, and the side of the second locking seat A450 facing the first locking seat A430 is provided with a pivoting protrusion A452. In this embodiment, the second pivot cylinder A4333 is located approximately at the center of the first seat locking groove A431, and the second pivot cylinder A4333 communicates with the third pivot hole A4334; the pivot protrusion A452 is located approximately at the center of the second seat locking groove A451, and the pivot protrusion A452 communicates with the fourth pivot hole A4501. The first locking seat A430 and the second locking seat A450 engage with each other, so that the first seat locking groove A431 and the second seat locking groove A451 form a seat locking cavity (not labeled), and the second pusher A425, the seat locking member A440 and the second reset member A470 are sequentially disposed in the seat locking cavity. The second pivot cylinder A4333 and the pivot protrusion A452 abut against each other, and the second pusher A425, the seat locking member A440 and the second reset member A470 are sleeved outside at least one of the second pivot cylinder A4333 and the pivot protrusion A452. In this embodiment, the second reset member A470 is also sleeved on the two push protrusions A445 of the second locking member. The two push protrusions A445 can position the second reset member A470 and prevent the second reset member A470 from shifting during deformation.

[0350] Please see Figure 88 The pivot shaft passes sequentially through the pivot protrusion A452, the second pivot cylinder A4333, and the first pivot cylinder A4143 to achieve the pivot connection of the second locking seat A450, the first locking seat A430, the drive seat A410, and the drive member A490. Alternatively, the pivot shaft passes sequentially through the fourth pivot hole A4501, the third pivot hole A4334, the second pivot hole A4141, and the first pivot hole A492 to achieve the pivot connection of the second locking seat A450, the first locking seat A430, the drive seat A410, and the drive member A490.

[0351] Further, see Figure 86The locking joint A400 may further include a retraction operation member A402, which is motive-connected to the drive member A490. When the second frame A300 is in the retracted state, the retraction operation member A402 is adapted to be operated to drive the drive member A490 to rotate relative to the drive seat A410. The retraction operation member A402 may be a flexible structure such as a webbing, traction rope, or steel cable; in this embodiment, the retraction operation member A402 is a webbing. Specifically, both ends of the retraction operation member A402 are respectively connected to the drive members A490 of the two locking joints A400 located on the left and right sides of the frame A10. Thus, when the retraction operation member A402 is pulled, the drive members A490 of the two locking joints A400 can be driven to rotate simultaneously.

[0352] Furthermore, such as Figure 96 and Figure 97As shown, the first locking seat A430 may further include, for example, an armrest connecting portion A436, and the armrest portion A330 may be pivotally connected to the armrest connecting portion A436. The armrest connecting portion A436 may include, for example, a cavity A4360 communicating with the outside. The locking joint A400 may further include, for example, a third locking member A404. The third locking member A404 is movably disposed in the cavity A4360 of the armrest seat A403 and is switchable between a restricted position and a disengaged position. One of the third locking member A404 and the drive seat A410 has a limiting protrusion A4141, and the other of the third locking member A404 and the drive seat A410 has a limiting recess A4041. In this embodiment, the third locking member A404 is provided with a limiting recess A4041, and the drive seat A410 is provided with a limiting protrusion A4141. When the second frame A300 is in the unfolded state, the third locking member A404 is in the disengaged position, and the limiting protrusion A4141 and the limiting recess A4041 are spaced apart. When the second frame A300 switches from the unfolded state to the retracted state, the limiting protrusion A4141 is inserted into the limiting recess A4041 to lock the second frame A300 in the retracted state. This prevents the second frame A300 from loosening relative to the first frame A100 under gravity after switching to the retracted state. Furthermore, the locking joint A400 may also include a fifth reset member A405, which pushes against the third locking member A404 to move the third locking member A404 to the limiting position. In this embodiment, the fifth reset member A405 is a spring. Specifically, a through groove A4042 may be formed approximately in the middle of the third locking member A404. The through groove A4042 is an elongated groove extending along the moving direction of the third locking member A404. The fifth reset member A405 is accommodated in the through groove A4042. For example, an abutment post A4361 may be fixed on the inner wall of the cavity A4360, and the abutment post A4361 passes through the through groove A4042. One end of the through groove A4042 has a fitting protrusion A4043. The abutment post A4361 is located on the side of the fitting protrusion A4043 away from the limiting recess A4041. One end of the fifth reset member A405 abuts against the abutment post A4361, and the other end is fitted onto the fitting protrusion A4043 and abuts against one end of the through groove A4042. Specifically, the side of the drive seat A410 facing the first locking seat A430 forms an annular pushing edge A417. The pushing edge A417 includes a first edge A4171 and a second edge A4172. The second edge A4172 is recessed relative to the first edge A4171 towards the pivot axis to form a pushing recess A4173. The bottom of the pushing recess A4173 is provided with the aforementioned limiting protrusion A4141. When the second frame A300 is in the unfolded state, the third locking member A404 is offset from the pushing recess A4173, and the third locking member A404 abuts against the second edge A4172 and remains in the disengaged position. The fifth reset member A405 undergoes elastic deformation.When the second frame A300 switches from the unfolded position to the retracted position, the drive seat A410 rotates until the third locking member A404 is opposite to the push recess A4173. The third locking member A404, which loses the pushing force of the first edge A4171, moves to the restricted position under the elastic restoring force of the fifth reset member A405 and extends out of the cavity A4360. This causes its restricting recess A4041 to engage with the restricting protrusion A4141 of the drive seat A410, thereby restricting the second frame A300 to the retracted state.

[0353] The following is combined with Figures 87 to 92 A detailed description of the linkage and retraction process of the A10 frame:

[0354] When the A10 frame needs to be folded down, such as Figure 87 As shown, firstly, the release mechanism A341 is operated, causing the backrest locking member A460 to move from the backrest locking position to the backrest release position, allowing the backrest part A310 to rotate relative to the seat part A320. At this time, the backrest part A310 can be pushed along the fourth rotation direction R4, causing it to retract towards the seat part A320, i.e., the second frame A300... Figure 87 The displayed state gradually switches to Figure 89 The state shown. During this process, as... Figure 88 and Figure 90As shown, during the rotation of the backrest A310, the first pusher A424 mounted thereon is also driven to rotate via the drive seat A410. During rotation, the first pusher A424's first push portion A4241 abuts against the first drive portion A491 of the drive member A490, thereby causing the first pusher A424 to move along the extension direction of the pivot axis, i.e., sliding along the second sliding direction F2. During sliding, the first pusher A424 pushes the push post A4251 of the second pusher A425 via its second push portion A4242, causing the second pusher A425 to also slide along the second sliding direction F2. During the sliding of the second pusher A425, it also pushes against the seat locking member A440, sliding together along the second sliding direction F2. At this time, the seat locking member A440 moves between the seat locking position and the seat unlocking position, while the first locking seat A430 and the second locking seat A450 remain locked. At this time, the third locking member A404 and the drive seat A410 are locked together by the limiting recess A4041 and the limiting protrusion A4141 to prevent the second frame A300 from loosening relative to the first frame A100 under the action of gravity, and the seat part A320 is fixed in the first rotation position relative to the first frame A100. To fully fold the frame A10, the user needs to further operate the folding mechanism A402 (e.g., pull the folding mechanism A402), thereby driving the drive mechanism A490 to rotate. The drive mechanism A490 pushes the first push part A4241 of the first push part A424 through the first drive part A491, causing the first push part A424 to continue sliding along the second sliding direction F2. The first push part A424 pushes the push post A4251 of the second push part A425 through its second push part A4242, causing the second push part A425 to continue sliding along the second sliding direction F2, and simultaneously pushing the seat lock part A440 to continue sliding along the second sliding direction F2, so that the seat lock part A440 slides to the seat release position, that is, the seat lock part A440 is completely located in the second seat lock groove A451. The first locking seat A430 and the second locking seat A450 can rotate relative to each other, meaning the second frame A300 can rotate relative to the first frame A100 from a first rotational position to a second rotational position. Simultaneously, the push protrusion A445 of the seat locking member A440 passes through the push hole A453 out of the seat locking cavity to push against the release member A250 of the locking mechanism A200. The release member A250 then pushes against the sliding member A221, causing the sliding member A221 to move from the frame locking position to the frame unlocking position, thereby switching the locking mechanism A200 from the first locked state to the first unlocked state. The first connecting seat A210 and the second connecting seat A220 can rotate relative to each other, allowing the first frame A100 to switch from an unfolded state to a folded state. This achieves the overall folding of the frame A10, such as... Figure 91 and Figure 92 As shown.

[0355] The aforementioned A10 frame and stroller have at least the following technical advantages:

[0356] The stroller frame A10 and the first frame A100 of the infant stroller are equipped with a locking mechanism A200. The locking mechanism A200, through the cooperation of guide rail A211 and slider A221, can switch between a first locked state and a first unlocked state. When the locking mechanism A200 is in the first locked state, the first frame A100 is locked in either an unfolded or folded state. When the locking joint A400 is in the first unlocked state, the first frame A100 can switch between the unfolded and folded states. By using the cooperation of guide rail A211 and slider A221 to achieve the locking and switching of the first frame A100's state, the size occupied by the locking mechanism A200 in the lateral direction can be greatly reduced, thereby increasing the seating width of the seat section A320.

[0357] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0358] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vehicle frame, characterized in that, The frame includes a rider connector, a front connector, a rear connector, and a retraction linkage mechanism. The rider connector, the front connector, and the rear connector are pivotally connected to each other. The retraction linkage mechanism is located between the rider connector, the front connector, and the rear connector. When the frame switches from the extended state to the retracted state, one of the rider connector, the front connector, and the rear connector moves, and drives the other two of the rider connector, the front connector, and the rear connector to rotate and retract together through the retraction linkage mechanism.

2. The frame according to claim 1, characterized in that, The rider connecting seat, the front connecting seat, and the rear connecting seat are pivotally connected by a pivot shaft, and the retraction linkage mechanism includes: A drive component is disposed through the driver's connecting seat, the front connecting seat and the rear connecting seat, and is spaced apart from the pivot shaft; The driver's connecting seat is provided with a first through slot, the front connecting seat is provided with a second through slot, and the rear connecting seat is provided with a third through slot. The first through slot, the second through slot, and the third through slot at least partially overlap, and the driving member passes through the first through slot, the second through slot, and the third through slot.

3. The frame according to claim 1, characterized in that, The rider connector, the rear connector, and the front connector are pivotally connected by a pivot shaft. The retraction linkage mechanism includes a driving member, a first connecting rod, and a first driven member. The first driven member is located between the rider connector and the rear connector. The rear connector has a fifth through slot, which is a through slot. The driving member passes through one end of the first connecting rod and the fifth through slot. The side of the rear connector facing the rider connector also has a sixth through slot, which is a blind slot. The rider connector has a second through hole. The first driven member passes through the second through hole and the other end of the first connecting rod and is inserted into the sixth through slot.

4. A locking mechanism, characterized in that, include: The first connecting seat is equipped with a guide rail; and The second connecting seat is equipped with a sliding component; The first connecting seat and the second connecting seat are pivotally connected to each other. The locking mechanism can switch between a first locked state and a first unlocked state through the cooperation of the guide rail and the sliding member. When the locking mechanism is in the first locked state, the first connecting seat and the second connecting seat are relatively fixed. When the locking mechanism is in the first unlocked state, the first connecting seat and the second connecting seat can rotate relative to each other. The sliding trajectory of the sliding member along the guide rail is perpendicular to the pivot axis of the first connecting seat and the second connecting seat.

5. The locking mechanism according to claim 4, characterized in that, The sliding member has a frame locking position and a frame unlocking position on the guide rail. When the sliding member is in the frame locking position, the locking mechanism is in a first locking state; when the sliding member is in the frame unlocking position, the locking mechanism is in a first unlocking state.

6. The locking mechanism according to claim 4, characterized in that, The guide rail includes an arc-shaped track centered on the pivot axis of the first connecting seat and the second connecting seat.

7. A vehicle frame, characterized in that, include: The first frame has both an unfolded and a folded state; and The locking mechanism as described in any one of claims 4 to 6; When the locking mechanism is in the first locking state, the first frame is locked in either the unfolded or folded state. When the locking mechanism is in the first unlocking state, the first frame can switch between the unfolded and folded states.

8. The frame according to claim 7, characterized in that, Also includes: The second frame is installed on the first frame and has a working state and a folded state. and The locking joint is located in the second frame; The second frame can be operated to drive the locking joint to switch the locking mechanism to the first unlocking state.

9. The frame according to claim 8, characterized in that, The locking joint also includes: Drive unit; A driving member, pivotally connected to the driving seat, and having a first driving part; The first pusher is mounted on the drive seat and rotates with the drive seat, and has a first pusher that can abut against the first drive part; A seat locking component for driving connection with the locking mechanism; When the second frame is in the folded state, the drive member is adapted to be operated to push the first push part through the first drive part, thereby driving the seat locking member to switch the locking mechanism to the first unlocking state.

10. The frame according to claim 9, characterized in that, The locking joint also includes: First locking seat; The second locking seat is pivotally connected to the first locking seat; The seat locking member is disposed between the first locking seat and the second locking seat, and can be switched between a seat locking position and a seat unlocking position. When the seat locking member is in the seat locking position, the first locking seat and the second locking seat are relatively fixed. When the seat locking member is in the seat unlocking position, the first locking seat and the second locking seat can rotate relative to each other. The first pushing member has a second pushing part. The drive seat can be operated to drive the first pushing member to move, and push the seat locking member from the seat locking position to the seat unlocking position through the second pushing part.

11. The frame according to claim 10, characterized in that, The locking joint also includes: The second pusher is disposed between the seat locking member and the first locking seat; One side of the second pusher abuts against the second pusher portion, and the other side of the second pusher abuts against the seat locking member.

12. The frame according to claim 11, characterized in that, The drive seat is pivotally connected to the first locking seat on the side of the first locking seat opposite to the second locking seat. The drive seat has a first guide hole, the first locking seat has a second guide hole, the second push member has a push post, the second push part of the first push member passes through the first guide hole between the drive seat and the first locking seat, and the push post of the second push member passes through the second guide hole to abut against the second push part.

13. The frame according to claim 9, characterized in that, The locking joint also includes: The second reset member is adapted to apply force to the seat lock member to move the seat lock member toward the seat lock position.

14. The frame according to claim 10, characterized in that, The locking joint also includes: The retraction mechanism is driven by the drive mechanism. In this configuration, the second frame is in a retracted state. The retracting operation member is adapted to be operated to drive the driving member to rotate relative to the driving seat, and pushes the first pushing member against the first pushing member through the first driving part, thereby moving the first pushing member. The second pushing member then pushes the seat locking member, causing the seat locking member to drive the locking mechanism to switch to the first unlocking state.

15. The frame according to claim 10, characterized in that, The second frame also includes a handrail, and the first locking seat also includes a handrail connecting part, wherein the handrail is connected to the handrail connecting part; The locking joint also includes: The third locking element is movably disposed in the armrest connection part and can be switched between a restricted position and a disengaged position; The third locking member and the drive seat each have a limiting protrusion and a limiting recess. When the second frame is in the unfolded state, the third locking member is in the disengaged position, and the limiting protrusion and the limiting recess are spaced apart. When the second frame switches from the unfolded state to the retracted state, the third locking member switches from the disengaged position to the limiting position, and the limiting protrusion is inserted into the limiting recess to lock the second frame in the retracted state.

16. The frame according to claim 10, characterized in that, The seat locking member has a push protrusion, and the second locking seat has a push hole opposite to the push protrusion; wherein, when the second frame is in the retracted state, the driving member is adapted to be operated to push the first push part through the first driving part, thereby driving the seat locking member to move so that the push protrusion passes through the push hole and pushes the locking mechanism to switch to the first unlocking state.

17. The frame according to claim 9, characterized in that, The first driving part is an arc-shaped protrusion with the pivot center of the driving member and the driving seat as the center, and the side of the first driving part facing the first pushing member forms a first pushing slope; the first pushing part is an arc-shaped protrusion with the pivot center of the driving member and the driving seat as the center, and the side of the first pushing member facing the driving member forms a second pushing slope.

18. The frame according to claim 9, characterized in that, The second frame includes a seat and a backrest. The drive seat is connected to the backrest, and the first locking seat is connected to the seat. The drive seat is pivotally connected to the first locking seat. The locking joint is switchable between a second locked state and a second unlocked state. When the locking joint is in the second locked state, the seat and the backrest are relatively fixed to keep the second frame in use, and the seat is in a first rotational position relative to the first frame. When the locking joint is in the second unlocked state, the backrest can rotate toward the seat to switch the second frame to a folded state, and the seat is in a first rotational position relative to the first frame. When the second frame is switched to the folded state, the drive member can be operated to push the first push member to push the first push member through the first drive member, thereby driving the seat locking member to release the locking mechanism. The first frame switches from an unfolded state to a folded state, and at the same time, the seat rotates relative to the locking mechanism from the first rotational position to the second rotational position.

19. A vehicle frame, characterized in that, include: The first frame has both an unfolded and a folded state; and A locking mechanism is provided on the first frame. The locking mechanism can switch between a first locked state and a first unlocked state. When the locking mechanism is in the first locked state, the first frame is locked in an unfolded state or a folded state. When the locking mechanism is in the first unlocked state, the first frame can switch between an unfolded state and a folded state.

20. The frame according to claim 19, characterized in that, The locking mechanism has a guide rail and a sliding member that can slide along the guide rail. The locking mechanism can switch between a first locked state and a first unlocked state through the cooperation of the guide rail and the sliding member.

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