Cart and joint structure thereof

Abstract

The utility model relates to a cart and a joint structure thereof, the joint structure comprises a first connecting seat, a second connecting seat and a third connecting seat, the first connecting seat, the second connecting seat and the third connecting seat are mutually pivoted in sequence around an axial direction, the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, and the third connecting seat is provided with a third limiting column; the first limiting column, the third limiting column and the second limiting column are sequentially arranged in the circumferential direction. The first locking piece is movably arranged between the first connecting base and the second connecting base in the axial direction and is provided with a first locking position and a first unlocking position, and when the first locking piece is located at the first locking position, the first connecting base, the second connecting base and the third connecting base are relatively fixed; the third limiting column at least abuts against one of the first limiting column and the second limiting column; when the first locking piece is located at the first unlocking position, the first connecting base and the third connecting base can pivot relative to the second connecting base.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheeled mobile devices, in particular to a stroller and a joint structure thereof. BACKGROUND

[0002] For families with infants, it has become very common and convenient to use a stroller as an auxiliary care tool when going out. The stroller is mainly composed of a frame and a seat, and most of them adopt a foldable design. When the stroller is not needed, the frame and the seat can be folded to reduce the volume, thereby facilitating storage or carrying. However, although the folding design brings convenience, the traditional folding joint structure is often relatively complex, which leads to a relatively large self-volume, not only occupying a large space, but also making the overall appearance of the stroller look bulky, affecting the aesthetic degree of the stroller. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a stroller and a joint structure thereof in view of the above problems.

[0004] A joint structure comprises a first connecting seat, a second connecting seat and a third connecting seat, the first connecting seat, the second connecting seat and the third connecting seat are pivotally connected to each other around an axis, the second connecting seat is located between the first connecting seat and the third connecting seat along the axis, the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, the third connecting seat is provided with a third limiting column, the first limiting column, the third limiting column and the second limiting column are arranged in sequence along the circumferential direction; a first locking member is movably arranged between the first connecting seat and the second connecting seat and has a first locking position and a first release position, and is located on a radial side of the first limiting column, the second limiting column and the third limiting column, when the first locking member is in the first locking position, the first connecting seat, the second connecting seat and the third connecting seat are relatively fixed, and the third limiting column at least abuts with one of the first limiting column and the second limiting column; when the first locking member is in the first release position, the first connecting seat and the third connecting seat can be pivoted relative to the second connecting seat.

[0005] In one embodiment, the first limiting column protrudes towards the second connecting seat, the second limiting column protrudes towards the first connecting seat, and the third limiting column protrudes towards the first connecting seat and passes through the second connecting seat, the second connecting seat is provided with a movable slot for the third limiting column to move along the circumferential direction, and the first limiting column and the third limiting column can move along the circumferential direction in the second connecting seat.

[0006] In one of the embodiments, the first locking member is located radially outside the first, second and third limiting columns.

[0007] In one of the embodiments, the joint structure further comprises a driving member movably arranged between the first and second connecting seats and having an initial position and an unlocking position, when the driving member moves from the initial position to the unlocking position, the driving member drives the first locking member to move from the first locking position to the first unlocking position, the driving member is arranged adjacent to the first locking member along the axial direction, and the driving member and the first locking member are both located radially outside the first, second and third limiting columns.

[0008] In one of the embodiments, the driving member is arranged adjacent to the first locking member between the first connecting seat and the first locking member, and the driving member is used to drive the first locking member to move to the second connecting seat to the first unlocking position.

[0009] In one of the embodiments, the first, second and third connecting seats are pivotally connected to each other at a first pivot, and the first pivot limits the first, second and third connecting seats from being separated along the axial direction.

[0010] In one of the embodiments, when the first locking member is in the first locking position, the first locking member is engaged with both the first and second connecting seats; when the first locking member is in the first unlocking position, the first locking member is engaged with the second connecting seat but disengaged from the first connecting seat, so that the first connecting seat can be pivoted relative to the second connecting seat.

[0011] In one of the embodiments, a first elastic member is arranged between the first locking member and the second connecting seat, and the first elastic member provides elastic restoring force for the first locking member to keep the first locking member in the first locking position.

[0012] In one of the embodiments, the joint structure further comprises a second locking member movably arranged in the joint structure and having at least one locking portion spaced apart from the axial direction, the second locking member has a second locking position and a second unlocking position, when the first locking member is in the first locking position, the second locking member is in the second locking position, and the at least one locking portion passes through the third and second connecting seats, when the first locking member is in the first unlocking position, the second locking member is in the second unlocking position, and the at least one locking portion only passes through the third connecting seat or the second connecting seat.

[0013] In one of the embodiments, when the first locking member moves from the first locking position to the first releasing position, the first locking member drives the second locking member to move from the second locking position to the second releasing position.

[0014] In one of the embodiments, when the first locking member moves to the second connecting base, the first locking member drives the at least one locking portion to move away from the second connecting base, so that the at least one locking portion only passes through the third connecting base to the second releasing position.

[0015] A stroller, comprising: a handle, a front wheel frame, a rear wheel frame, and the articulated structure as described above, wherein the handle is connected with the first connecting base, the front wheel frame is connected with the second connecting base, the rear wheel frame is connected with the third connecting base, and the handle, the front wheel frame, and the rear wheel frame are pivotally connected with each other through the articulated structure, so that the stroller can be switched between an extended state and a folded state, and the rear wheel frame is located between the handle and the front wheel frame in the circumferential direction; when the stroller is in the extended state, the first locking member is in the first locking position, and the handle, the front wheel frame, and the rear wheel frame are arranged in the circumferential direction; when the stroller is in the folded state, the handle is close to the rear wheel frame in the circumferential direction, and the rear wheel frame is close to the front wheel frame in the circumferential direction.

[0016] In one of the embodiments, when the stroller is in the folded state, the first locking member is in the first releasing position.

[0017] In one of the embodiments, when the stroller is in the folded state, the first limiting column, the third limiting column, and the second limiting column are arranged in the circumferential direction.

[0018] In one of the embodiments, when the stroller is in the folded state, the third limiting column abuts against the groove wall on the side of the movable groove away from the second limiting column in the circumferential direction.

[0019] In one of the embodiments, the first connecting base is provided with a first clamping member, and the second connecting base is provided with a second clamping member, wherein the first clamping member and the second clamping member are located between the first limiting column and the second limiting column in the circumferential direction, and are located on the side of the first limiting column and the second limiting column away from the third limiting column in the circumferential direction; when the stroller is in the folded state, the first clamping member abuts against the second clamping member on the side of the second clamping member close to the second limiting column.

[0020] In one of the embodiments, when the stroller is in the unfolded state, the first engaging member is located at one side of the second engaging member close to the first limiting post and is spaced apart from the second engaging member.

[0021] In one of the embodiments, the first engaging member comprises an elastic arm and a convex bump, the elastic arm has an elastic force of radial elastic deformation, and the convex bump is located at the radial inner side of the elastic arm; when the stroller is in the folded state, the elastic arm is at least partially located at the radial outer side of the second engaging member, and the convex bump abuts against the second engaging member at one side of the second engaging member close to the second limiting post.

[0022] In one of the embodiments, at least one of the first engaging member and the second engaging member is provided with a guide slope, when the first connecting base rotates relative to the second connecting base in the circumferential direction, the guide slope is used to guide the first engaging member to move from one side of the second engaging member close to the first limiting post to one side of the second engaging member close to the second limiting post.

[0023] In one of the embodiments, the outer side of the second connecting base is provided with a first blocking part, and the outer side of the third connecting base is provided with a second blocking part, when the first locking member is in the first unlocking position and the stroller is not in the folded state, the first blocking part and the second blocking part abut against each other in the circumferential direction.

[0024] In one of the embodiments, the first blocking part is arranged on the outer periphery of the second connecting base, the first blocking part extends towards the third connecting base and is convex relative to the outer periphery of the second connecting base; the second blocking part is arranged on the outer periphery of the third connecting base, the second blocking part extends towards the second connecting base and is convex relative to the outer periphery of the third connecting base.

[0025] In one of the embodiments, the first connecting base is provided with a first pushing part, the first pushing part is convexly formed towards the second connecting base, and the first pushing part is spaced apart from the first limiting post in the circumferential direction; when the stroller is in the folded state, the first pushing part is located between the first limiting post and the third limiting post in the circumferential direction, and the third limiting post is located between the first pushing part and the second limiting post in the circumferential direction; when the stroller is switched from the folded state to the unfolded state, the first pushing part pushes the third limiting post towards the direction close to the second limiting post.

[0026] In one of the embodiments, when the stroller is in the folded state, the first abutting portion is located between the first limiting column and the third limiting column in the circumferential direction, when the stroller is in the unfolded state, the third limiting column is located between the first limiting column and the first abutting portion in the circumferential direction, and the first abutting portion is elastically deformable in the radial direction.

[0027] In one of the embodiments, the second limiting column is located on one side of the track of the circumferential movement of the first abutting portion in the direction parallel to the axial direction.

[0028] In one of the embodiments, the plane where the end surface of the first abutting portion is located and the plane where the end surface of the second limiting column is located are spaced apart or just flush in the direction parallel to the axial direction.

[0029] In one of the embodiments, the first abutting portion is in the form of an elastic arm, and the extension direction of the elastic arm intersects the circumferential direction.

[0030] In one of the embodiments, the third limiting column is provided with an abutting surface on the side close to the first limiting column, the abutting surface is located on the track of the circumferential movement of the first abutting portion, and when the first abutting portion abuts against the abutting surface, the included angle between the extension direction of the abutting surface and the extension direction of the first abutting portion is between 65° and 75°.

[0031] In one of the embodiments, the first connecting seat is further provided with a fourth limiting column, the fourth limiting column is formed by protruding towards the second connecting seat, the fourth limiting column is spaced apart from the first limiting column in the circumferential direction, when the stroller is in the unfolded state, the third limiting column is located between the first limiting column and the fourth limiting column in the circumferential direction, and when the stroller is switched from the unfolded state to the folded state, the fourth limiting column abuts against the third limiting column to move the third limiting column away from the second limiting column.

[0032] In one of the embodiments, when the stroller is in the unfolded state, the fourth limiting column is spaced apart from the third limiting column farther than the second limiting column, and the fourth limiting column is used to move over the second limiting column in the circumferential direction to abut against the third limiting column to move the third limiting column away from the second limiting column.

[0033] In one of the embodiments, the second limiting column is located on one side of the track of the circumferential movement of the fourth limiting column in the direction parallel to the axial direction.

[0034] In one of the embodiments, the fourth limiting post is spaced apart from or just flush with the plane in which the end face of the second connecting seat is located, in a direction parallel to the axial direction.

[0035] In one of the embodiments, the first pushing part is located between the first limiting post and the fourth limiting post in the circumferential direction.

[0036] In one of the embodiments, the distance between the first pushing part and the fourth limiting post in the circumferential direction is greater than or equal to the maximum width of the third limiting post in the circumferential direction.

[0037] In one of the embodiments, when the stroller is in the extended state, the third limiting post is located between the first limiting post and the first pushing part in the circumferential direction, and the fourth limiting post is located away from the third limiting post compared to the first pushing part in the circumferential direction.

[0038] In one of the embodiments, the third limiting post is provided with a pressing surface on the side close to the second limiting post, the pressing surface is located on the track of the circumferential movement of the first pushing part, and when the first pushing part contacts the pressing surface, the included angle between the extension direction of the pressing surface and the extension direction of the first pushing part is between 0° and 25°.

[0039] In one of the embodiments, the stroller further comprises a seat and a fourth connecting seat, the fourth connecting seat is pivotally connected with the third connecting seat about the axial direction, the second connecting seat and the third connecting seat are both located between the first connecting seat and the fourth connecting seat, and the seat is connected with the fourth connecting seat.

[0040] In one of the embodiments, the handle frame comprises a first pushing frame, a second pushing frame, and a folding joint, the second pushing frame is pivotally connected with the first pushing frame through the folding joint, so that the first pushing frame can be unfolded or folded relative to the second pushing frame, the stroller further comprises a third traction member, the third traction member is connected with the first pushing frame and the seat, and when the first pushing frame is unfolded relative to the second pushing frame, the first pushing frame drives the seat to rotate in the circumferential direction away from the rear wheel frame through the third traction member.

[0041] In one of the embodiments, the fourth connecting seat is provided with a second pushing part, the second connecting seat is provided with a third pushing part, the second pushing part and the third pushing part are oppositely arranged in the circumferential direction, and when the first pushing frame drives the seat to rotate in the circumferential direction away from the rear wheel frame through the third traction member, the second pushing part abuts against the third pushing part to drive the front wheel frame to rotate in the circumferential direction away from the rear wheel frame.

[0042] In one of the embodiments, the third connecting base is provided with a limiting slot, at least part of the second pushing part and at least part of the third pushing part protrude in the limiting slot, and the second pushing part and the third pushing part move along the circumference in the limiting slot.

[0043] In one of the embodiments, one end of the limiting slot in the circumference is used for abutting against the second pushing part, and the other end of the limiting slot in the circumference is used for abutting against the third pushing part.

[0044] In one of the embodiments, the process of switching the stroller from the folding state to the stretching state includes a first stage and a second stage; in the first stage, the handle frame rotates along the circumference in the direction away from the front wheel frame, and the handle frame drives the rear wheel frame to rotate along the circumference in the direction away from the front wheel frame; in the second stage, the first pushing frame is unfolded relative to the second pushing frame, the first pushing frame drives the seat to rotate along the circumference in the direction away from the rear wheel frame through the third traction member, and the seat drives the front wheel frame to rotate along the circumference in the direction away from the rear wheel frame.

[0045] A joint structure, comprising: a first connecting seat, a second connecting seat and a third connecting seat, the first connecting seat, the second connecting seat and the third connecting seat being pivotally connected to each other along an axial direction, and the second connecting seat being located between the first connecting seat and the third connecting seat along the axial direction; a first locking member movably arranged between the first connecting seat and the second connecting seat and having a first locking position and a first releasing position, when the first locking member is in the first locking position, the first connecting seat and the second connecting seat are relatively fixed, and when the first locking member is in the first releasing position, the first connecting seat can be pivoted relative to the second connecting seat; a second locking member movably arranged in the joint structure and provided with at least one locking portion, the locking portion being arranged apart from the axial direction, the second locking member having a second locking position and a second releasing position, when the second locking member is in the second locking position, the at least one locking portion passes through the third connecting seat and the second connecting seat to relatively fix the second connecting seat and the third connecting seat, and when the second locking member is in the second releasing position, the at least one locking portion only passes through the third connecting seat or the second connecting seat to enable the second connecting seat to be pivoted relative to the third connecting seat; and a driving member movably arranged between the first connecting seat and the second connecting seat and having an initial position and an unlocking position, the driving member being arranged adjacent to the first locking member and / or the second locking member, when the driving member moves from the initial position to the unlocking position, the driving member drives the first locking member to move from the first locking position to the first releasing position and drives the second locking member to move from the second locking position to the second releasing position.

[0046] In one of the embodiments, when the driving member moves from the initial position to the unlocking position, the driving member directly drives the first locking member to move from the first locking position to the first releasing position, and when the first locking member moves from the first locking position to the first releasing position, the first locking member drives the second locking member to move from the second locking position to the second releasing position.

[0047] In one of the embodiments, the driving member is arranged adjacent to the first locking member along the axial direction between the first connecting seat and the first locking member, and the driving member is used to drive the first locking member to move to the second connecting seat to the first releasing position, and when the first locking member moves to the second connecting seat, the first locking member drives the at least one locking portion to move away from the second connecting seat to enable the at least one locking portion to only pass through the third connecting seat to enable the second locking member to be in the second releasing position.

[0048] In one of the embodiments, the joint structure further comprises a fourth connecting seat, pivotally connected with the third connecting seat in the axial direction, and the second connecting seat and the third connecting seat are located between the first connecting seat and the fourth connecting seat; and a third locking member movably arranged between the third connecting seat and the fourth connecting seat, and having a third locking position and a third unlocking position, when the third locking member is in the third locking position, the third connecting seat and the fourth connecting seat are relatively fixed, and when the third locking member is in the third unlocking position, the third connecting seat can pivot relative to the fourth connecting seat; when the driving member moves from the initial position to the unlocking position, the driving member drives the third locking member to move from the third locking position to the third unlocking position.

[0049] In one of the embodiments, when the second locking member moves from the second locking position to the second unlocking position, the second locking member drives the third locking member to move from the third locking position to the third unlocking position.

[0050] In one of the embodiments, when the at least one locking portion moves away from the second connecting seat, the at least one locking portion drives the third locking member to move to the fourth connecting seat to the third unlocking position.

[0051] In one of the embodiments, when the third locking member is in the third locking position, the third locking member is engaged with the third connecting seat and the fourth connecting seat at the same time; and when the third locking member is in the third unlocking position, the third locking member is engaged with the fourth connecting seat, and is disengaged from the third connecting seat, so that the fourth connecting seat can pivot relative to the third connecting seat.

[0052] In one of the embodiments, a second elastic member is arranged between the third locking member and the fourth connecting seat, and the second elastic member provides elastic restoring force for the third locking member, so that the third locking member is kept in the third locking position.

[0053] In one of the embodiments, the second locking member is provided with a main body portion, and the at least one locking portion is protruded from the main body portion in a direction parallel to the axial direction, and the main body portion is located between the third connecting seat and the third locking member, and is arranged adjacent to the third locking member.

[0054] In one of the embodiments, the second locking member is provided with a plurality of locking portions, and the plurality of locking portions are arranged in a circumferential direction.

[0055] A stroller comprises a handle, a front wheel frame, a rear wheel frame and a joint structure as described above, wherein the handle is connected with the first connecting seat, the front wheel frame is connected with the second connecting seat, the rear wheel frame is connected with the third connecting seat, the handle, the front wheel frame and the rear wheel frame are pivotally connected with each other through the joint structure, so that the stroller can be switched between an extended state and a folded state, the rear wheel frame is located between the front wheel frame and the handle along the circumferential direction; when the stroller is in the extended state, the driving member is in the initial position, the first locking member is in the first locking position, the second locking member is in the second locking position, and the handle, the front wheel frame and the rear wheel frame are arranged at intervals along the circumferential direction; when the stroller is in the folded state, the handle is close to the rear wheel frame along the circumferential direction, and the rear wheel frame is close to the front wheel frame along the circumferential direction.

[0056] In one of the embodiments, when the stroller is in the folded state, the driving member is in the unlocked position, and the first locking member is in the first unlocking position, and the second locking member is in the second unlocking position.

[0057] In one of the embodiments, the outer side of the second connecting seat is provided with a first blocking part, and the outer side of the third connecting seat is provided with a second blocking part, when the driving member is in the unlocked position, the first locking member is in the first unlocking position, the second locking member is in the second unlocking position, and the stroller is not in the folded state, the first blocking part and the second blocking part abut each other along the circumferential direction.

[0058] In one of the embodiments, the handle comprises a first handle frame, a second handle frame and a folding joint, the second handle frame is pivotally connected with the first handle frame through the folding joint, so that the first handle frame can be unfolded or folded relative to the second handle frame, the folding joint comprises a fifth connecting seat connected with the first handle frame, a sixth connecting seat connected with the second handle frame, the sixth connecting seat is pivotally connected with the fifth connecting seat, so that the first handle frame can be unfolded or folded relative to the second handle frame, one of the fifth connecting seat and the sixth connecting seat is provided with a limiting recess, and the other is provided with a fifth locking member, the fifth locking member is movably arranged in the other of the fifth connecting seat and the sixth connecting seat and has a first position and a second position, when the fifth locking member is in the first position, the fifth locking member extends into the limiting recess, so that the first handle frame and the second handle frame remain relative folded, when the fifth locking member is in the second position, the fifth locking member is retracted from the limiting recess, so as to allow the first handle frame to pivot relative to the second handle frame.

[0059] In one of the embodiments, the fifth locking member is provided with a sliding inclined surface adapted to release the limit towards at least one of the one end of the limiting recess and the limiting recess.

[0060] In one of the embodiments, the folding joint further comprises a limiting cover and a third elastic member, the fifth connecting base is provided with a movable hole, the fifth locking member movably penetrates into the movable hole, the limiting cover is arranged on the side of the fifth connecting base away from the sixth connecting base, and the third elastic member is abutted between the limiting cover and the fifth locking member to keep the fifth locking member in the first position; the sixth connecting base is provided with the limiting recess.

[0061] In one of the embodiments, the stroller comprises a first push frame and a second push frame, the second push frame is pivotally connected with the first push frame so that the first push frame can be unfolded or folded relative to the second push frame, the second push frame is connected with the first connecting base, and the driving member is connected with the first push frame through a first traction member; when the first push frame is pivoted relative to the second push frame, the first push frame drives the first traction member to move to drive the driving member to rotate relative to the first connecting base and move along the axial direction, so that the driving member moves from the initial position to the unlocking position.

[0062] In one of the embodiments, the driving member is provided with an abutting portion protruding along a direction parallel to the axial direction and extending along a circumferential direction; the first connecting base is provided with a pushing portion protruding along a direction parallel to the axial direction and extending along a circumferential direction; and the abutting portion and the pushing portion abut each other along the direction parallel to the axial direction.

[0063] In one of the embodiments, the stroller comprises a first push frame, a second push frame, and a folding joint, the second push frame is pivotally connected with the first push frame through the folding joint so that the first push frame can be unfolded or folded relative to the second push frame, the folding joint comprises a fifth connecting base connected with the first push frame, a sixth connecting base connected with the second push frame, the sixth connecting base is provided with a locking groove, the sixth connecting base and the fifth connecting base are pivotally connected with each other so that the first push frame can be unfolded or folded relative to the second push frame, and a fourth locking member movably arranged on the first push frame, when the first push frame is unfolded relative to the second push frame, the fourth locking member is inserted into the locking groove to limit the first push frame from pivoting relative to the second push frame.

[0064] In one of the embodiments, the handle frame further comprises a release button movably arranged on the first pushing frame and connected with the fourth locking member through a second traction member, when the release button moves relative to the first pushing frame, the release button drives the fourth locking member to move relative to the first pushing frame to be able to disengage from the locking slot.

[0065] In one of the embodiments, the handle frame further comprises a safety push button movably arranged on the first pushing frame and having a third position and a fourth position, when the safety push button is in the third position, the safety push button abuts against the release button to prevent the release button from moving relative to the first pushing frame, when the safety push button is in the fourth position, the safety push button is spaced apart from the release button to allow the release button to move relative to the first pushing frame, the moving direction of the safety push button is staggered with the moving direction of the release button.

[0066] A stroller, comprising a handle frame, a front wheel frame, a rear wheel frame, a seat and the articulated structure as described above, wherein the handle frame is connected with the first connecting seat, the front wheel frame is connected with the second connecting seat, the rear wheel frame is connected with the third connecting seat, the seat is connected with the fourth connecting seat, the handle frame, the front wheel frame, the rear wheel frame and the seat are pivotally connected with each other through the articulated structure to make the stroller switchable between an extended state and a folded state; when the stroller is in the extended state, the handle frame, the rear wheel frame, the front wheel frame and the seat are sequentially arranged along a circumferential direction, the driving member is in the initial position, the first locking member is in the first locking position, the second locking member is in the second locking position, and the third locking member is in the third locking position; when the stroller is in the folded state, the handle frame and the rear wheel frame are both close to the front wheel frame along the circumferential direction, and the seat is close to the rear wheel frame.

[0067] In one of the embodiments, when the stroller is in the folded state, the driving member is in the unlocking position, the first locking member is in the first release position, the second locking member is in the second release position, and the third locking member is in the third release position.

[0068] In one of the embodiments, the outer periphery of the third connecting seat is provided with a third blocking portion, and the outer periphery of the fourth connecting seat is provided with a fourth blocking portion, when the third locking member is in the third locking position, the third blocking portion and the fourth blocking portion abut against each other along the circumferential direction.

[0069] In one of the embodiments, the third blocking portion extends towards the fourth connecting seat and is convex relative to the outer periphery of the fourth connecting seat; and the fourth blocking portion extends towards the third connecting seat and is convex relative to the outer periphery of the third connecting seat.

[0070] In one of the embodiments, the seat comprises a seat plate, a folding harness arranged in the seat plate, and a winding mechanism connected to both ends of the folding harness, both ends of the folding harness respectively pass through the seat plate to extend from a first surface to a second surface of the seat plate, and are connected to the winding mechanism arranged on the second surface, the winding mechanism automatically tightens the folding harness, and the first surface and the second surface are oppositely arranged. BRIEF DESCRIPTION OF DRAWINGS

[0071] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application.

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0073] In addition, the drawings are not drawn in the ratio of 1:1, and the relative sizes of the various elements are only exemplarily drawn in the drawings, but not necessarily drawn in the true ratio. In the drawings:

[0074] Figure 1 It is a perspective view of the stroller in an embodiment of the present application;

[0075] Figure 2 It is a perspective view of the stroller in another view in an embodiment of the present application;

[0076] Figure 3 It is a sectional view of the stroller in an embodiment of the present application, wherein the stroller is in an extended state;

[0077] Figure 4 It is an enlarged view of circle A in Figure 3

[0078] Figure 5 It is a partial perspective view of the stroller with a handle in Figure 1

[0079] Figure 6 It is an exploded schematic view of the partial structure of the stroller with a handle in Figure 1

[0080] Figure 7 ​​​for Figure 1 A partial 3D view of the trolley with the rider's frame from another perspective;

[0081] Figure 8 For along Figure 7 A sectional view of line U1-U1 in the middle;

[0082] Figure 9 For along Figure 7 A sectional view of line U2-U2 in the middle;

[0083] Figure 10 for Figure 9 Enlarged view of circle B;

[0084] Figure 11 for Figure 10 A cross-sectional view of the rider frame when the fifth locking element extends into the limiting recess;

[0085] Figure 12 This is a side view of a trolley in one embodiment of this application, wherein the first pusher frame is folded relative to the second pusher frame;

[0086] Figure 13 This is a cross-sectional view of a trolley in one embodiment of this application, wherein the rider's frame is folded towards the front wheel frame and the rear wheel frame;

[0087] Figure 14 This is a cross-sectional view of a trolley in one embodiment of this application, wherein the trolley is in a folded state;

[0088] Figure 15 This is a partial exploded perspective view of a trolley in one embodiment of the present application, which shows the joint structure in the first embodiment;

[0089] Figure 16 for Figure 15 Enlarged view of circle C;

[0090] Figure 17 for Figure 15 Enlarged view of circle D;

[0091] Figure 18 This is a partial exploded perspective view of the trolley from another angle in one embodiment of this application, showing the joint structure in the first embodiment;

[0092] Figure 19 For along Figure 1 A sectional view of line U3-U3 in the middle;

[0093] Figure 20 For along Figure 12 A sectional view of line U4-U4 in the middle;

[0094] Figure 21 for Figure 15 A three-dimensional view of the first connector from another perspective;

[0095] Figure 22 is a perspective view of the second connecting seat in Figure 15

[0096] Figure 23 is a perspective view of the third connecting seat in Figure 15

[0097] Figure 24 is a perspective view of the seat in an embodiment of the present application;

[0098] Figure 25 is a perspective view of the seat in Figure 24

[0099] Figure 26 is a sectional view along the line U5-U5 in Figure 24

[0100] Figure 27 is a bottom view of the seat in another embodiment of the present application;

[0101] Figure 28 is a sectional view of the seat in Figure 27

[0102] Figure 29 is an exploded view of the joint structure in a second embodiment of the present application;

[0103] Figure 30 is an exploded view of the joint structure in a sixth embodiment of the present application;

[0104] Figure 31 is an exploded view of the joint structure in a seventh embodiment of the present application;

[0105] Figure 32 is an exploded view of the joint structure in an eighth embodiment of the present application;

[0106] Figure 33 is an exploded view of the joint structure in a ninth embodiment of the present application;

[0107] Figure 34 is an exploded view of the joint structure in a tenth embodiment of the present application;

[0108] Figure 35 is an exploded view of the joint structure in an eleventh embodiment of the present application;

[0109] Figure 36 is a perspective view of the first connecting seat of the joint structure in the eleventh embodiment of the present application;

[0110] Figure 37 is a partial exploded view of the joint structure in the eleventh embodiment of the present application from another angle, Figure 37 ​​​​​Only the first connecting seat, the second connecting seat and the third connecting seat and other components are reserved;

[0111] Figure 38 The sectional view of the stroller in the folding state in the eleventh embodiment of the present application;

[0112] Figure 39 The sectional view of the third limiting column in the eleventh embodiment of the present application;

[0113] Figure 40 The sectional view of the stroller in the extending state in the eleventh embodiment of the present application, specifically, Figure 40 The joint structure, the handle frame and the front wheel frame are processed in section;

[0114] Figure 41 The sectional view of the stroller in the state between the folding state and the extending state in the eleventh embodiment of the present application, specifically, Figure 41 The joint structure is processed in section. DETAILED DESCRIPTION

[0115] In order to make the above objectives, features and advantages of the present application more apparent, more comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0116] An embodiment of the present application provides a stroller 1000, which can include a frame 100 and a cloth cover (not shown in the figure) sleeved on the frame 100. Wherein, the frame 100 can include a handle frame 110, a front wheel frame 120, a rear wheel frame 130 and a joint structure 200 provided by some embodiments of the present application. Hereinafter, the joint structure 200 will be described together while the stroller 1000 and the frame 100 are described.

[0117] Figure 1 and Figure 2A cart 1000 is shown according to an embodiment of the present application, the structure of the frame 100 of the cart 1000 is generally left-right symmetrical, the handle frame 110, the front wheel frame 120 and the rear wheel frame 130 of the frame 100 are respectively connected with two joint structures 200. Among them, the cart 1000 passes through the two joint structures 200 located on the left and right sides, so that the handle frame 110, the front wheel frame 120 and the rear wheel frame 130 connected to the joint structure 200 can rotate relative to each other, and then the handle frame 110, the front wheel frame 120 and the rear wheel frame 130 can be unfolded and folded, in other words, the cart 1000 can have an extended state (see Figure 1 and Figure 2 ) and a folded state (see Figure 14 ). When the cart 1000 is needed, the cart 1000 can be in an extended state; when the cart 1000 needs to be stored, the cart 1000 can be in a folded state to save the space occupied and facilitate storage.

[0118] Referring to Figure 1 and Figure 2 , in an embodiment, each joint structure 200 described above can include a first connecting seat 210, a second connecting seat 220 and a third connecting seat 230, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are pivotally connected with each other around an axial direction (the circumferential direction around the axial direction is the radial direction perpendicular to the axial direction), and at least part of the second connecting seat 220 is located between the first connecting seat 210 and the third connecting seat 230 along the axial direction, so that the cart 1000 has an extended state and a folded state. Among them, the first connecting seat 210 is used to be connected with the handle frame 110, the second connecting seat 220 is used to be connected with the front wheel frame 120, and the third connecting seat 230 is used to be connected with the rear wheel frame 130, so that the cart 1000 can be switched between the extended state and the folded state. Of course, in other embodiments, the second connecting seat 220 can be used to be connected with the rear wheel frame 130, and the third connecting seat 230 is used to be connected with the front wheel frame 120, so that the cart 1000 can also be switched between the extended state and the folded state. Specifically, when the cart 1000 is in the extended state, the handle frame 110, the front wheel frame 120 and the rear wheel frame 130 are arranged at intervals in the circumferential direction, and the rear wheel frame 130 is located between the front wheel frame 120 and the handle frame 110 in the circumferential direction, the front wheel frame 120 and the rear wheel frame 130 are arranged at a first included angle α1 (see Figure 3 ), and the handle frame 110 and the front wheel frame 120 are arranged at a second included angle α2 (see Figure 3 ). When the cart 1000 is in the folded state, the handle frame 110 is close to the rear wheel frame 130 in the circumferential direction, the rear wheel frame 130 is close to the front wheel frame 120 in the circumferential direction, and the front wheel frame 120 and the rear wheel frame 130 are arranged at a third included angle α3 (see Figure 14), the fourth angle a4 is arranged between the handle frame 110 and the front wheel frame 120 (see Figure 14 ). The third angle a3 is less than the first angle a1, and the fourth angle a4 is less than the second angle a2.

[0119] For the sake of clear understanding of the structure of the stroller 1000, the specific structure of the front wheel frame 120, the rear wheel frame 130, the handle frame 110 and each joint structure 200 will be described one by one.

[0120] Referring to Figure 1 and Figure 2 , in an embodiment, the front wheel frame 120 has a U-shaped structure, which includes front rod members 121 on the left and right sides and a front cross rod 122 connected between the two front rod members 121. The front cross rod 122 extends substantially along the first direction F1, which is equivalent to the left-right direction of the stroller 1000. When a child is seated on the stroller 1000, the front cross rod 122 can also be used as a footboard.

[0121] In an embodiment, the stroller 1000 further includes at least one front wheel seat 141 mounted to the bottom of the front wheel frame 120. Specifically, in the present embodiment, as shown in Figure 1 and Figure 2 , the stroller 1000 includes two front wheel seats 141 mounted to the bottom of the front wheel frame 120, which are arranged in the left-right direction (i.e. the first direction F1). More specifically, the two front wheel seats 141 are mounted to the left and right ends of the front cross rod 122, and the two front rod members 121 are respectively connected to the front wheel seat 141 on the same side. The stroller 1000 further includes at least one front wheel 151 mounted to the front wheel seat 141, so that the stroller 1000 can move. Specifically, in the present embodiment, the stroller 1000 includes two front wheels 151, and each front wheel seat 141 is used to mount one front wheel 151. The front wheel 151 can be a universal wheel or a non-universal wheel. Of course, in other embodiments, the front wheel frame 120 can also have other implementations, for example, the front wheel frame 120 only includes two front rod members 121, one end of the two front rod members 121 is connected to form a V-shaped structure, and the stroller 1000 can be mounted with one front wheel seat 141 at one end of the two front rod members 121, and one front wheel seat 141 is connected to one front wheel 151.

[0122] It should be noted that, unless otherwise specified and limited, the "left", "right" and other orientation terms of the stroller 1000 in the embodiments of the present application are based on the "left", "right" orientation of the stroller 1000 in normal driving, and the "left", "right" directions are schematically shown by arrows L, R in the drawings. These orientation terms are only used to make the description of the embodiments of the present application clearer, and should not be used to improperly limit the scope of protection of the present application.

[0123] With reference to Figure 1 and Figure 2 , the rear wheel frame 130 can include two rear rod members 131 located at left and right sides and a rear cross rod 132 connected between the two rear rod members 131, the two rear rod members 131 at left and right sides are connected with the front rod member 121 at the same side through the corresponding joint structure 200 respectively, and the rear cross rod 132 extends along the first direction F1. Specifically, the rear cross rod 132 has two, and the two rear cross rods 132 are arranged at intervals along the length direction of the rear rod member 131. The stroller 1000 further includes at least one rear wheel seat 142 mounted to the bottom of the rear wheel frame 130. Specifically, in the embodiment, the stroller 1000 includes two rear wheel seats 142 mounted to the bottom of the rear wheel frame 130, and the two rear wheel seats 142 are arranged at intervals in the left-right direction (i.e. the first direction F1). More specifically, the two rear wheel seats 142 are mounted to the left and right ends of the rear cross rod 132 at the end of the rear rod member 131, and the two rear rod members 131 are connected with the rear wheel seat 142 at the same side respectively. The stroller 1000 further includes a rear wheel 152 mounted to the rear wheel seat 142, so that the stroller 1000 can be moved. Specifically, in the embodiment, the stroller 1000 includes two rear wheels 152, and each rear wheel seat 142 is used to mount one rear wheel 152, wherein the rear wheel 152 may, for example, also be a universal wheel or a non-universal wheel. In the embodiment, the size of the rear wheel 152 is larger than the size of the front wheel 151, so that the overall structure of the stroller 1000 is more stable. Of course, in other embodiments, the size of the rear wheel 152 can be the same as or smaller than the size of the front wheel 151.

[0124] Optionally, in other embodiments, the rear wheel frame 130 can have other implementations, for example, the rear wheel frame 130 only includes two rear rod members 131, one end of the two rear rod members 131 is connected to form a V-shaped structure, and the stroller 1000 is provided with one rear wheel seat 142 mounted at the end of the two rear rod members 131 connected. Alternatively, for example, the rear wheel frame 130 only includes two rear rod members 131 arranged in parallel in the left-right direction, and the two rear wheel seats 142 are connected with the two rear rod members 131 respectively.

[0125] With reference to Figure 1 and Figure 2 , the handle frame 110 includes a first pushing frame 111, a second pushing frame 112, and two folding joints 113. The second pushing frame 112 is pivoted to the first pushing frame 111 through the two folding joints 113 at left and right sides, so that the first pushing frame 111 can be unfolded (see Figure 3 ) or folded (see Figures 12 to 14). Specifically, the first handle frame 111 is, for example, in a U-shaped structure as a whole, which includes a handle bar 1112 and two first support bars 1111. The two first support bars 1111 are arranged parallel to each other and are spaced apart along the first direction F1, and the handle bar 1112 is in a U-shape and is connected between the two first support bars 1111 for a user to hold to push the stroller 1000. More specifically, the second handle frame 112 includes, for example, two second support bars 1121 which are spaced apart along the first direction F1, and the upper ends of the two second support bars 1121 are, for example, respectively pivotally connected with the lower ends of the first support bars 1111 on the same side through the folding joints 113 on the same side, and the lower ends of the two second support bars 1121 are, for example, respectively connected with the first connecting seats 210 in the joint structures 200 on the same side.

[0126] Referring to Figures 4 to 6 In an embodiment, each folding joint 113 includes a fifth connecting seat 1131, a sixth connecting seat 1132, and a fourth locking member 1133. The fifth connecting seat 1131 is connected with the first handle frame 111 (specifically the first support bars 1111), the sixth connecting seat 1132 is connected with the second handle frame 112 (specifically the second support bars 1121), and the sixth connecting seat 1132 is pivotally connected with the fifth connecting seat 1131 through a second pivot 1137, so that the first handle frame 111 can be unfolded or folded relative to the second handle frame 112. In order to prevent the first handle frame 111 from being randomly rotated relative to the second handle frame 112, in an embodiment, as shown in Figure 4 and Figure 6 , the sixth connecting seat 1132 is provided with a locking slot 11321, and the fourth locking member 1133 is movably arranged on the first handle frame 111. When the first handle frame 111 is unfolded relative to the second handle frame 112, the first handle frame 111 is substantially parallel to the second handle frame 112, i.e. the first handle frame 111 and the second handle frame 112 are substantially in the same plane, and the included angle between the first handle frame 111 and the second handle frame 112 is substantially 180 degrees (see Figure 2 and Figure 3 ). At this time, the fourth locking member 1133 can be inserted into the locking slot 11321 to limit the pivoting of the first handle frame 111 relative to the second handle frame 112, so that the first handle frame 111 can be stably maintained in the unfolded state relative to the second handle frame 112. When the fourth locking member 1133 is withdrawn from the locking slot 11321, the first handle frame 111 can be pivoted to be folded relative to the second handle frame 112, and the included angle between the first handle frame 111 and the second handle frame 112 is an acute angle (see Figure 13 and Figure 14 ) or tends to be 0 degrees. Of course, in other embodiments, when the stroller 1000 is in the unfolded state, the included angle between the first handle frame 111 and the second handle frame 112 can also be an obtuse angle or an acute angle, which is not specifically limited herein.

[0127] In order to conveniently control the fourth locking member 1133 to retreat from the locking slot 11321 so as to enable the first push frame 111 to be folded relative to the second push frame 112, in an embodiment, as shown in Figure 1 、 Figure 3 and Figure 4 , the push frame 110 further comprises a release button 161 and a second traction member 162. The release button 161 is movably arranged on the first push frame 111 and connected with the fourth locking member 1133 through the second traction member 162. When the release button 161 moves relative to the first push frame 111, the release button 161 drives the fourth locking member 1133 to move relative to the first push frame 111 through the second traction member 162 so as to be able to retreat from the locking slot 11321. The second traction member 162 may, for example, be a traction rope, etc., one end of which is connected with the release button 161 and the other end of which is connected with the fourth locking member 1133. Specifically, as shown in Figure 7 and Figure 8 , the release button 161 comprises an operation part 1612, and the push frame 110 further comprises a driving wheel 1611 rotatably arranged on the first push frame 111 and connected with one end of the second traction member 162, and the operation part 1612 is movably arranged on the first push frame 111 and connected with the driving wheel 1611, so that the release button 161 is indirectly connected with one end of the second traction member 162 through the driving wheel 161. When the operation part 1612 moves relative to the first push frame 111, it can drive the driving wheel 1611 to rotate relative to the first push frame 111, and then pull the second traction member 162 to move so as to enable the fourth locking member 1133 to retreat from the locking slot 11321.

[0128] In an embodiment, as shown in Figure 3 and Figure 4 , the push frame 110 further comprises a fourth elastic member 163 arranged on the first push frame 111, which may, for example, be a compression spring and abut against the fourth locking member 1133, for driving the fourth locking member 1133 to reset, so as to enable the fourth locking member 1133 to constantly have a tendency to insert into the locking slot 11321.

[0129] In an embodiment, as shown in Figure 8In an embodiment, the handle frame 110 further comprises a safety push button 164 movably arranged on the first push frame 111 and having a third position and a fourth position. When the safety push button 164 is in the third position, the safety push button 164 abuts against the release button 161 to prevent the release button 161 from moving relative to the first push frame 111. Specifically, the safety push button 164 is arranged to abut against the operation portion 1612 to prevent the operation portion 1612 from moving relative to the first push frame 111, and thus prevent the driving wheel 1611 from rotating to drive the second traction member 162 to move. When the safety push button 164 is in the fourth position, the safety push button 164 is spaced apart from the release button 161 to allow the release button 161 to move relative to the first push frame 111. The moving direction of the safety push button 164 is staggered with the moving direction of the release button 161. Therefore, when a user needs to pivot the first push frame 111 relative to the second push frame 112 to fold the handle frame 110, the user needs to first operate (e.g. press) the safety push button 164 to move the safety push button 164 to the fourth position, and then operate (e.g. press) the operation portion 1612 to move the fourth locking member 1133 out of the locking slot 11321. In this way, the user can avoid the handle frame 110 from being accidentally folded due to the misoperation of the release button 161.

[0130] Referring to Figure 6 , Figures 9 to 11 In an embodiment, each folding joint 113 further comprises a fifth locking member 1134, one of the fifth connecting seat 1131 and the sixth connecting seat 1132 is provided with a limiting recess 11322, and the other is provided with the fifth locking member 1134, and the fifth locking member 1134 is movably arranged and has a first position and a second position. Specifically, as shown in Figure 6 , the sixth connecting seat 1132 is provided with the limiting recess 11322, and the limiting recess 11322 is arranged spaced apart from the locking slot 11321 along the circumferential direction around the second pivot 1137, and the fifth locking member 1134 is movably arranged on the fifth connecting seat 1131. As shown in Figure 11 , when the first push frame 111 is folded relative to the second push frame 112, and the fifth locking member 1134 is in the first position, the fifth locking member 1134 extends into the limiting recess 11322, so that the first push frame 111 and the second push frame 112 can be kept relative folded, and the handle frame 110 can be prevented from being accidentally pivoted after being folded. As shown in Figure 9 and Figure 10 , when the fifth locking member 1134 is in the second position, the fifth locking member 1134 is retracted from the limiting recess 11322, so that the first push frame 111 can be pivoted relative to the second push frame 112 to unfold the handle frame 110.

[0131] Referring to Figure 6 , Figure 10 and Figure 11 In the embodiment, the folding joint 113 further comprises a limiting cover 1135 and a third elastic member 1136. Specifically, the fifth connecting base 1131 is provided with a movable hole 11311, and the fifth locking member 1134 is movably arranged in the movable hole 11311. The limiting cover 1135 is arranged on the side of the fifth connecting base 1131 away from the sixth connecting base 1132, and the third elastic member 1136 is abutted between the limiting cover 1135 and the fifth locking member 1134, so that the fifth locking member 1134 is kept in the first position.

[0132] Continuing to refer to Figure 6 , Figure 10 and Figure 11 In an embodiment, the fifth locking member 1134 is provided with a sliding slope 11341 adapted to release the limiting at least one of the one end of the limiting recess 11322 and the limiting recess 11322. Specifically, the fifth locking member 1134 is provided with the sliding slope 11341 at the one end of the limiting recess 11322, and the inner wall of the limiting recess 11322 is also provided with the sliding slope 11341. In this way, the fifth locking member 1134 can push the limiting recess 11322 through the sliding slope 11341, so that when the sixth connecting base 1132 drives the limiting recess 11322 to rotate relative to the fifth connecting base 1131, the fifth locking member 1134 can move out of the limiting recess 11322 in a direction away from the sixth connecting base 1132, that is, equivalent to moving the fifth locking member 1134 from the first position to the second position.

[0133] The use process and working principle of the folding joint 113 will be described below in combination with Figures 3 to 11

[0134] Referring to Figure 3 , Figure 4 and Figure 10 When the handlebar 110 is unfolded, that is, when the first push handle 111 and the second push handle 112 are unfolded relative to each other, the first push handle 111 and the second push handle 112 are substantially in the same plane, and the included angle therebetween is substantially 180 degrees. At this time, the lock slot 11321 on the sixth connecting base 1132 is opposite to the fourth locking member 1133, and under the action of the fourth elastic member 163, the fourth locking member 1133 is inserted into the lock slot 11321, which can limit the pivoting of the fifth connecting base 1131 relative to the sixth connecting base 1132. At the same time, the fifth locking member 1134 is abutted against the surface of the sixth connecting base 1132 under the action of the third elastic member 1136.

[0135] Referring to Figure 7 and Figure 8 ​When the user needs to fold the stroller 110, the user first presses the safety knob 164 to make the safety knob 164 in the fourth position, and then presses the operating part 1612 upward. The operating part 1612 drives the driving wheel 1611 to rotate, thereby driving the second traction member 162 to move and driving the fourth locking member 1133 to move away from the sixth connecting seat 1132, so that the fourth locking member 1133 retreats from the locking groove 11321. At this time, the user can rotate the first push handle 111 to fold the first push handle 111 relative to the second push handle 112. When the first push handle 111 is folded relative to the second push handle 112, the limiting recess 11322 is opposite to the fifth locking member 1134, and the third elastic member 1136 drives the fifth locking member 1134 to automatically insert into the limiting recess 11322 (see Figure 11 ), so that the first push handle 111 can be kept in the relative folded state relative to the second push handle 112.

[0136] Referring to Figure 6 , Figure 10 and Figure 11 , since the fifth locking member 1134 and the limiting recess 11322 are both provided with sliding inclined surfaces 11341, when the user needs to unfold the stroller 110, the user can directly rotate the first push handle 111, and under the guidance of the sliding inclined surfaces 11341, the fifth locking member 1134 can gradually move relative to the limiting recess 11322 and gradually exit from the limiting recess 11322. When the first push handle 111 is unfolded relative to the second push handle 112, the fourth elastic member 163 drives the fourth locking member 1133 to insert into the locking groove 11321, so that the stroller 110 can be kept in the unfolded state.

[0137] Referring to 1 and Figure 2 , in the joint structure 200 provided in the first embodiment, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are pivotally connected to each other at the first pivot shaft (not shown in the figure, the axial direction of the first pivot shaft is the axial direction), so that the movement of the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 in the axial direction can be limited, and the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are prevented from being separated or detached from each other in the axial direction, thereby improving the stability of the joint structure 200 and the stroller 1000.

[0138] Referring to Figures 15 to 18In the first embodiment, the joint structure 200 further comprises a first locking member 240, a second locking member 280 and a driving member 250. The first locking member 240 is movably arranged between the first connecting seat 210 and the second connecting seat 220 in the axial direction and has a first locking position and a first releasing position. Specifically, when the first locking member 240 is in the first locking position, the first connecting seat 210 and the second connecting seat 220 are relatively fixed. When the first locking member 240 is in the first releasing position, the first connecting seat 210 can pivot relative to the second connecting seat 220. The second locking member 280 is movably arranged in the joint structure 200 in the axial direction and has at least one locking portion 281 extending in a direction parallel to the axial direction. The second locking member 280 has a second locking position and a second releasing position. When the second locking member 280 is in the second locking position, the at least one locking portion 281 extends through the third connecting seat 230 and the second connecting seat 220 in the direction parallel to the axial direction, and the locking portion 281 is arranged radially apart from the first pivot. In this way, the rotation of the second connecting seat 220 relative to the third connecting seat 230 about the first pivot is limited, so that the second connecting seat 220 and the third connecting seat 230 are relatively fixed. When the second locking member 280 is in the second releasing position, the locking portion 281 extends through only the third connecting seat 230 or the second connecting seat 220 in the direction parallel to the axial direction, so that the second connecting seat 220 can pivot relative to the third connecting seat 230. The driving member 250 is arranged outside the first pivot and can rotate about the first pivot, and can be movably arranged between the first connecting seat 210 and the second connecting seat 220 in the axial direction, and has an initial position and an unlocking position. When the driving member 250 moves from the initial position to the unlocking position, the driving member 250 drives the first locking member 240 to move from the first locking position to the first releasing position, and drives the second locking member 280 to move from the second locking position to the second releasing position. In this way, the positions of the first locking member 240 and the second locking member 280 can be changed by changing the position of the driving member 250, so that the relative state between the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 can be changed, i.e. the stroller 1000 can be switched between the expanded state and the folded state.

[0139] It should be noted that the above "at least one locking portion 281" means that the locking portion 281 can be one, two or more, and when multiple locking portions 281 are provided, the multiple locking portions 281 can be arranged at intervals in the circumferential direction. Specifically, in the present embodiment, the second locking member 280 is provided with a main body portion 282, and the locking portion 281 is formed in a direction parallel to the axial direction from the main body portion 282. More specifically, the main body portion 282 is in a ring structure, and the first pivot passes through the center of the main body portion 282. The second locking member 280 is provided with multiple locking portions 281, which are arranged at intervals in the circumferential direction of the main body portion 282. In this way, by the multiple locking portions 281 passing through the third connecting seat 230 and the second connecting seat 220 at the same time, the rotation of the second connecting seat 220 relative to the third connecting seat 230 around the first pivot can be further limited, thereby improving the stability of the second locking member 280 locking the second connecting seat 220 and the third connecting seat 230.

[0140] Referring to Figure 17 , the second locking member 280 is provided with multiple clamping portions 283 extending radially from the main body portion 282, and the multiple clamping portions 283 are arranged at intervals in the circumferential direction.

[0141] In the present embodiment, the driving member 250 is arranged adjacent to the first locking member 240, and when the driving member 250 moves from the initial position to the unlocking position, the driving member 250 directly drives the first locking member 240 to move from the first locking position to the first release position, and at the same time, when the first locking member 240 moves from the first locking position to the first release position, the first locking member 240 directly drives the second locking member 280 to move from the second locking position to the second release position. In other words, in the present embodiment, when the driving member 250 moves from the initial position to the unlocking position, the driving member 250 directly drives the first locking member 240 to move from the first locking position to the first release position, and at the same time, the second locking member 280 can also be indirectly driven to move from the second locking position to the second release position by the first locking member 240.

[0142] Referring to Figure 15 and Figure 16 , in an embodiment, the driving member 250 is used to drive the first locking member 240 to move in the positive direction of the axial direction to the second connecting seat 220, so as to reach the first release position. As Figure 19 shown, when the first locking member 240 is in the first locking position, the first locking member 240 is clamped with the first connecting seat 210 and the second connecting seat 220 at the same time, so that the first connecting seat 210 and the second connecting seat 220 remain relatively fixed. As Figure 20As shown, when the first locking member 240 is in the first release position, the first locking member 240 is engaged with the second connecting seat 220 and disengaged from the first connecting seat 210, so that the first connecting seat 210 can pivot relative to the second connecting seat 220. It should be noted that in the present embodiment, the first release position of the first locking member 240 can be regarded as that the first locking member 240 is located in the second connecting seat 220.

[0143] Specifically, the first locking member 240 is a gear structure and can be penetrated by the first pivot. As shown in Figure 21 and Figure 22 As shown, the side of the first connecting seat 210 facing the second connecting seat 220 is provided with a first accommodating space 212 in the form of a ring and a plurality of first locking grooves 213 arranged in a circumferential direction and located outside the first accommodating space 212. The side of the second connecting seat 220 facing the first connecting seat 210 is provided with a second accommodating space 222 in the form of a ring and a plurality of second locking grooves 223 arranged in a circumferential direction and located outside the second accommodating space 222. When the first locking member 240 is in the first locking position, one end of the first locking member 240 in the axial direction is located in the first accommodating space 212 and the other end is located in the second accommodating space 222 (see Figure 19 ), so that the plurality of protruding teeth on the outer periphery of the first locking member 240 are simultaneously accommodated in the plurality of first locking grooves 213 and the plurality of second locking grooves 223 in the direction parallel to the axial direction. When the first locking member 240 is in the first release position, the first locking member 240 is completely moved into the second accommodating space 222 (see Figure 20 ), and the plurality of protruding teeth on the outer periphery of the first locking member 240 are only accommodated in the plurality of second locking grooves 223 in the direction parallel to the axial direction.

[0144] It should be noted that the positive direction in the axial direction refers to the direction of moving from the first connecting seat 210 to the third connecting seat 230 in the axial direction. Correspondingly, the direction of moving from the third connecting seat 230 to the first connecting seat 210 in the axial direction can be regarded as the negative direction in the axial direction.

[0145] Referring to Figures 16 to 18In the embodiment, the main body 282 of the second locking member 280 is located on the side of the third connecting seat 230 away from the second connecting seat 220. When the second locking member 280 is in the second locking position, the locking portion 281 sequentially passes through the third connecting seat 230 and the second connecting seat 220 in a direction parallel to the axial direction. Therefore, when the first locking member 240 moves from the first locking position to the first unlocking position, the first locking member 240 drives the locking portion 281 to move in a direction parallel to the positive direction of the axial direction until the locking portion 281 is disengaged from the second connecting seat 220, so that the locking portion 281 only passes through the third connecting seat 230 to reach the second unlocking position. It should be noted that in the embodiment, the second unlocking position of the second locking member 280 can be regarded as that the second locking member 280 is only located between the third connecting seat 230 and the fourth connecting seat 290 (see below) or is only located in the fourth connecting seat 290.

[0146] Referring to Figure 2 、 Figures 15 to 18 In an embodiment, the joint structure 200 further comprises a fourth connecting seat 290 and a third locking member 310. The fourth connecting seat 290 is pivotally connected to the third connecting seat 230 about the axial direction, i.e., the fourth connecting seat 290 is pivotally connected to the first pivot. The second connecting seat 220 and the third connecting seat 230 are both located between the first connecting seat 210 and the fourth connecting seat 290. The third locking member 310 is movably arranged between the third connecting seat 230 and the fourth connecting seat 290 along the axial direction and has a third locking position and a third unlocking position. Specifically, when the third locking member 310 is in the third locking position, the third connecting seat 230 and the fourth connecting seat 290 are relatively fixed, and when the third locking member 310 is in the third unlocking position, the third connecting seat 230 can pivot relative to the fourth connecting seat 290. When the driving member 250 moves from the initial position to the unlocking position, the driving member 250 drives the third locking member 310 to move from the third locking position to the third unlocking position.

[0147] Although in the embodiment, the first connecting seat 210, the second connecting seat 220, the third connecting seat 230 and the fourth connecting seat 290 all rotate about the axial direction. In other embodiments, the first connecting seat 210 and the second connecting seat 220 can rotate about a first axial direction, the second connecting seat 220 and the third connecting seat 230 can rotate about a second axial direction, and the third connecting seat 230 and the fourth connecting seat 290 can rotate about a third axial direction. The first axial direction, the second axial direction and the third axial direction are parallel to each other but not coaxial. Alternatively, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 can rotate about a first axial direction, and the fourth connecting seat 290 and the third connecting seat 230 can rotate about a second axial direction. The first axial direction and the second axial direction are parallel to each other but not coaxial.

[0148] It is to be noted that the driving member 250 is configured to indirectly drive the third locking member 310 to move from the third locking position to the third release position in the present embodiment. For example, the driving member 250 is configured to indirectly drive the third locking member 310 to move through the second locking member 280. Specifically, as shown in Figure 17 and Figure 18 , the main body 282 of the second locking member 280 is located between the third locking member 310 and the third connecting seat 230. When the second locking member 280 is moved from the second locking position to the second release position, the second locking member 280 directly drives the third locking member 310 to move from the third locking position to the third release position (switched from Figure 19 to Figure 20 ). Therefore, in the present embodiment, when the driving member 250 is moved from the initial position to the unlocking position, it directly drives the first locking member 240 to move away from the first locking position to the first release position. Then, through the unlocked first locking member 240, the driving member 250 continues to indirectly drive the second locking member 280 to move from the second locking position to the second release position. Finally, through the further transmission of the second locking member 280, the third locking member 310 is enabled to move from the third locking position to the third release position.

[0149] In an embodiment, when the locking portion 281 on the third locking member 310 is moved to disengage from the second connecting seat 220, the locking portion 281 drives the third locking member 310 to move in the positive direction of the axial direction to the fourth connecting seat 290 to the third release position. In other words, the third release position of the third locking member 310 can be considered as the third locking member 310 is located in the fourth connecting seat 290. Specifically, when the third locking member 310 is in the third locking position, the third locking member 310 is engaged with both the third connecting seat 230 and the fourth connecting seat 290. When the third locking member 310 is in the third release position, the third locking member 310 is engaged with the fourth connecting seat 290 while disengaging from the third connecting seat 230, and the fourth connecting seat 290 can be pivoted relative to the third connecting seat 230.

[0150] Specifically, the third locking member 310 is a gear structure and can be penetrated by the first pivot. As shown in Figure 17 , Figure 19 and Figure 20As shown, the third connecting seat 230 is provided with a third accommodating space 232 in the form of a ring and a plurality of third locking grooves 233 arranged in the circumferential direction at the periphery of the third accommodating space 232 on the side facing the fourth connecting seat 290. The fourth connecting seat 290 is provided with a fourth accommodating space 291 in the form of a ring and a plurality of fourth locking grooves 292 arranged in the circumferential direction at the periphery of the fourth accommodating space 291 on the side facing the third connecting seat 230. When the third locking member 310 is in the third locking position, one end of the third locking member 310 is located in the third accommodating space 232 and the other end is located in the fourth accommodating space 291 (see Figure 19 ). In this way, the plurality of protrusions on the outer periphery of the third locking member 310 are simultaneously accommodated in the plurality of third locking grooves 233 and the plurality of fourth locking grooves 292 in a direction parallel to the axial direction. When the third locking member 310 is in the third unlocking position, the third locking member 310 is completely moved into the fourth accommodating space 291 (see Figure 20 ). In this way, the plurality of protrusions on the outer periphery of the third locking member 310 are only accommodated in the plurality of fourth locking grooves 292 in a direction parallel to the axial direction.

[0151] Referring to Figures 15 to 18 , in an embodiment, a first elastic member 260 is arranged between the first locking member 240 and the second connecting seat 220. The first elastic member 260 provides elastic restoring force for the first locking member 240, so that the first locking member 240 is kept in the first locking position. In this way, under the restoring force of the first elastic member 260, the first locking member 240 is automatically moved from the first unlocking position to the first locking position, and the driving member 250 is further moved from the unlocking position to the initial position. Alternatively, the first elastic member 260 is a compression spring, and the two ends thereof abut between the second connecting seat 220 and the first locking member 240.

[0152] Continuing to refer to Figures 15 to 18 , in an embodiment, a second elastic member 320 is arranged between the third locking member 310 and the fourth connecting seat 290. The second elastic member 320 provides elastic restoring force for the third locking member 310, so that the third locking member 310 is kept in the third locking position. In this way, the first elastic member 260 can drive the first locking member 240 to be automatically moved from the first unlocking position to the first locking position, so that the first locking member 240 releases the pressing of the second locking member 280, the second elastic member 320 can drive the third locking member 310 to be automatically moved from the third unlocking position to the third locking position, and further drive the second locking member 280 to be automatically moved from the second unlocking position to the second locking position, so as to finally limit the relative rotation between the first connecting seat 210, the second connecting seat 220, the third connecting seat 230 and the fourth connecting seat 290, and further keep the relative fixation. Similarly, the second elastic member 320 can be a compression spring, and the two ends thereof abut between the fourth connecting seat 290 and the third locking member 310.

[0153] Referring to Figure 1 , Figure 2 and Figure 19 , in an embodiment, the stroller 1000 further comprises a seat 170 (see below for details) and the seat 170 is connected with the fourth connecting seat 290. Specifically, when the stroller 1000 is in the extended state, the seat 170 and the rear wheel frame 130 are arranged at a fifth included angle a5 (see Figure 3 ). When the stroller 1000 is in the folded state, the seat 170 and the rear wheel frame 130 are arranged at a sixth included angle (not shown in the figure), wherein the sixth included angle is smaller than the fifth included angle a5.

[0154] The use process and working principle of the joint structure 200 will be briefly described below in combination with relevant figures.

[0155] Referring to Figure 3 and Figure 19 , in the embodiment, when the stroller 1000 is in the extended state, the driving member 250 is in the initial position, the first locking member 240 is in the first locking position, and the first connecting seat 210 and the second connecting seat 220 are kept relatively fixed. In addition, the second locking member 280 is in the second locking position, and the locking portion 281 penetrates through the second connecting seat 220 and the third connecting seat 230 to keep them relatively fixed. In addition, the third locking member 310 is in the third locking position, and the third connecting seat 230 and the fourth connecting seat 290 are kept relatively fixed. Therefore, under the cooperation of the first locking member 240, the second locking member 280 and the third locking member 310, the stroller 1000 can be stably kept in the extended state.

[0156] When it is needed to switch the stroller 1000 from the extended state to the folded state (from Figure 3 to Figure 12 , Figure 13 and Figure 14When the driving member 250 is moved to the unlocking position, the first locking member 240 is located at the first release position, the first elastic member 260 is in the compressed state, and the first connecting seat 210 can rotate relative to the second connecting seat 220, so that the handlebar 110 and the front wheel frame 120 are close to each other. At the same time, the second locking member 280 is located at the second release position, the locking portion 281 is away from the second connecting seat 220, so that the second connecting seat 220 can rotate relative to the third connecting seat 230, so that the front wheel frame 120 and the rear wheel frame 130 are close to each other. In addition, the third locking member 310 is located at the third release position, the second elastic member 320 is in the compressed state, and the fourth connecting seat 290 can rotate relative to the third connecting seat 230, so that the seat 170 and the rear wheel frame 130 are close to each other.

[0157] When the stroller 1000 needs to be switched from the folded state to the unfolded state, the seat 170, the rear wheel frame 130, the front wheel frame 120 and the handlebar 110 can be rotated to restore to the corresponding positions when the stroller 1000 is in the unfolded state, thereby driving the corresponding connecting seats to rotate around the first pivot. In this process, the second elastic member 320 is gradually reset and pushes the third locking member 310 to move to the third locking position, so that the fourth connecting seat 290 is fixed relative to the third connecting seat 230. The third locking member 310 pushes the second locking member 280 to move to the second locking position during movement to the third locking position, that is, pushes the locking portion 281 to penetrate the third connecting seat 230 and the second connecting seat 220 in a direction parallel to the axial direction, thereby limiting the pivoting between the third connecting seat 230 and the second connecting seat 220. In addition, the first elastic member 260 is gradually reset and pushes the first locking member 240 to move to the first locking position, thereby limiting the pivoting between the second connecting seat 220 and the first connecting seat 210.

[0158] According to the foregoing description, when the stroller 1000 is switched between the folded state and the unfolded state, the handlebar 110, the front wheel frame 120, the rear wheel frame 130 and the seat 170 connected to the joint structure 200 are rotated with the corresponding connecting seats, so that the stroller 1000 can be switched between the unfolded state and the folded state.

[0159] In order to facilitate the user to control the position of the driving member 250, referring to Figure 6 and Figure 16In an embodiment, the driving member 250 is connected with the handle frame 110 through a first traction member 270. Specifically, in the embodiment, the driving member 250 is connected with the fifth connecting seat 1131 through the first traction member 270. More specifically, the first traction member 270 can be a traction rope, one end of which is connected with the fifth connecting seat 1131, and the other end of which is connected with the driving member 250. Thus, when the first handle frame 111 is pivoted relative to the second handle frame 112, the fifth connecting seat 1131 is pivoted relative to the sixth connecting seat 1132, so that the end of the traction rope connected with the fifth connecting seat 1131 is rotated, and in turn drives the driving member 250 to rotate around the first pivot.

[0160] In order to realize the conversion of the driving member 250 from the rotary motion to the axial motion, in an embodiment, as shown in Figure 16 and Figure 21 , the driving member 250 is provided with an abutting portion 251, which protrudes in a direction parallel to the axial direction and extends in a circumferential direction. The first connecting seat 210 is provided with a pushing portion 214, which protrudes in a direction parallel to the axial direction and extends in a circumferential direction. Specifically, the pushing portion 214 is formed by protruding from the bottom wall of the first accommodating space 212 in the first connecting seat 210 towards the driving member 250. The abutting portion 251 and the pushing portion 214 abut against each other in a direction parallel to the axial direction. Specifically, when the stroller 1000 is in the unfolded state, the abutting portion 251 and the pushing portion 214 abut against each other. When the stroller 1000 is switched from the unfolded state to the folded state, the first handle frame 111 is pivoted relative to the second handle frame 112 around the second pivot 1137 (switched from Figure 3 to Figure 12 ), in the process, the fifth connecting seat 1131 drives one end of the first traction member 270 to rotate around the second pivot 1137, so as to drive the driving member 250 to rotate relative to the first connecting seat 210 in a circumferential direction around the first pivot. Under the abutment of the abutting portion 251 and the pushing portion 214, the driving member 250 can move in a positive direction of the axial direction, so as to move the driving member 250 from the initial position to the unlocked position.

[0161] In the present embodiment, when the user needs to fold the stroller 1000, the user first pushes the safety push button 164 to move the safety push button 164 to the fourth position, and then operates the release button 161 to drive the fourth locking piece 1133 to retreat from the locking slot 11321, so that the folding of the first handle frame 111 and the second handle frame 112 can be achieved by rotating the first handle frame 111. In this process, the fifth connecting seat 1131 rotates around the second pivot 1137, thereby driving the first traction piece 270 to move, and finally driving the driving piece 250 to rotate around the first pivot. Since the driving piece 250 is provided with an abutting portion 251, when the driving piece 250 rotates, the abutting portion 251 abuts against the push portion 214 on the first connecting seat 210, thereby driving the driving piece 250 to move in the positive direction of the axial direction to switch to the unlocking position. According to the foregoing description, when the driving piece 250 is in the unlocking position, the first locking piece 240 is in the first release position, the second locking piece 280 is in the second release position, and the third locking piece 310 is in the third release position. At this time, the first connecting seat 210 can rotate relative to the second connecting seat 220, the second connecting seat 220 can rotate relative to the third connecting seat 230, and the third connecting seat 230 can rotate relative to the fourth connecting seat 290, so that the stroller 1000 can be switched from the unfolded state to the folded state.

[0162] In an embodiment, the first connecting seat 210 is provided with a first limiting column 211 extending in a direction parallel to the axial direction (see Figure 21 ), the second connecting seat 220 is provided with a second limiting column 221 extending in a direction parallel to the axial direction (see Figure 16 and Figure 22 ), the third connecting seat 230 is provided with a third limiting column 231 extending in a direction parallel to the axial direction (see Figure 17 and Figure 23 ), and the first limiting column 211, the third limiting column 231 and the second limiting column 221 are sequentially arranged in the circumferential direction. When the stroller 1000 is in the unfolded state, the first connecting seat 210, the second connecting seat 220 and the third connecting seat 230 are relatively fixed, and the third limiting column 231 abuts against at least one of the first limiting column 211 and the second limiting column 221. Specifically, in the present embodiment, as Figure 3As shown, the third limiting post 231 abuts against the first limiting post 211 and the second limiting post 221 respectively. In this way, the third connecting seat 230 can be fixed relative to the second connecting seat 220 and the first connecting seat 210 respectively, i.e. the third connecting seat 230 cannot rotate relative to the second connecting seat 220, and at the same time, the third connecting seat 230 cannot rotate relative to the first connecting seat 210. It can be seen that when the stroller 1000 is in the unfolded state, the second locking member 280 can ensure the relative fixation between the second connecting seat 220 and the third connecting seat 230, and in addition, the mutual abutment of the third limiting post 231 and the first limiting post 211 and the second limiting post 221 can further realize the stable fixation of the second connecting seat 220 relative to the third connecting seat 230. In this way, the stability and reliability of the stroller 1000 in the unfolded state can be improved. As shown in Figure 14 As shown, when the stroller 1000 is in the folded state, the first limiting post 211, the third limiting post 231 and the second limiting post 221 are sequentially arranged in the circumferential direction, at this time, the third connecting seat 230 can pivot relative to the first connecting seat 210 and the second connecting seat 220.

[0163] Specifically, as shown in Figure 16 , Figure 17 and Figures 21 to 23 As shown in the embodiment, the first limiting post 211 is formed in a direction parallel to the axial direction and protrudes towards the second connecting seat 220, the second limiting post 221 is formed in a direction parallel to the axial direction and protrudes towards the first connecting seat 210, and the third limiting post 231 is formed in a direction parallel to the axial direction and protrudes towards the first connecting seat 210 and passes through the second connecting seat 220. More specifically, the second connecting seat 220 is provided with a movable slot 224 for the third limiting post 231 to move in the circumferential direction, and the movable slot 224 has an arc-shaped structure. The first limiting post 211 and the third limiting post 231 can move in the circumferential direction within the second connecting seat 220. Specifically, when the stroller 1000 is in the folded state, the third limiting post 231 abuts against the slot wall (see Figure 14 ) of the movable slot 224 away from the second limiting post 221.

[0164] It needs to be explained that the first limiting column 211 is formed protruding towards the second connecting seat 220 and is arranged axially spaced apart; specifically, the first limiting column 211 is formed protruding from the bottom wall of the first accommodating space 212 in the first connecting seat 210 towards the second connecting seat 220. The second limiting column 221 is formed protruding towards the first connecting seat 210 and is arranged axially spaced apart; specifically, the second limiting column 221 is formed protruding from the bottom wall of the second accommodating space 222 in the second connecting seat 220 towards the first connecting seat 210. The third limiting column 231 is formed protruding towards the first connecting seat 210 and passing through the second connecting seat 220, and is arranged axially spaced apart; specifically, the third limiting column 231 is formed protruding from the surface of the third connecting seat 230 facing the second connecting seat 220 towards the first connecting seat 210. The first limiting column 211, the second limiting column 221 and the third limiting column 231 all extend in a direction parallel to the axial direction, which is only a preferred embodiment.

[0165] Referring to Figure 3 , Figure 13 and Figure 14 , in an embodiment, the first locking member 240 and the driving member 250 are both located on the radial side of the first limiting column 211, the second limiting column 221 and the third limiting column 231. Specifically, the first locking member 240 and the driving member 250 are both located on the radial outer side of the first limiting column 211, the second limiting column 221 and the third limiting column 231, that is, the first locking member 240 and the driving member 250 can be considered as being movably sleeved on the outer side of the first limiting column 211, the second limiting column 221 and the third limiting column 231. In this way, the axial movement or rotation of the first locking member 240 and the driving member 250 can be avoided from interfering with the circumferential movement of the limiting columns.

[0166] In order to enable the stroller 1000 to be stably kept in the folded state after being folded, referring to Figure 21 and Figure 22 , in an embodiment, the first connecting seat 210 is provided with a first clamping member 215, and the second connecting seat 220 is provided with a second clamping member 225. Specifically, the first clamping member 215 and the second clamping member 225 are both located between the first limiting column 211 and the second limiting column 221 in the circumferential direction, and are located on the side of the first limiting column 211 and the second limiting column 221 away from the third limiting column 231 in the circumferential direction. When the stroller 1000 is in the folded state, the first clamping member 215 and the second clamping member 225 are clamped with each other, specifically, the first clamping member 215 abuts against the second clamping member 225 on the side of the second clamping member 225 close to the second limiting column 221 (see Figure 14). In this way, the first connecting seat 210 can be fixed after rotating relative to the second connecting seat 220 to limit the movement of the handlebar 110 away from the rear wheel frame 130. When the stroller 1000 is in the unfolded state, the first engaging member 215 is located at the side of the second engaging member 225 close to the first limiting post 211 and is spaced apart from the second engaging member 225 (see Figure 3 ).

[0167] Referring to Figure 3 , Figure 14 , Figure 21 and Figure 22 , in an embodiment, the second engaging member 225 is a engaging protrusion which is formed protruding towards the first connecting seat 210 in a direction parallel to the axial direction, and the engaging protrusion is provided with an engaging portion 2255. Specifically, the second engaging member 225 is formed protruding from the bottom wall of the second accommodating space 222 in the second connecting seat 220 towards the first connecting seat 210. The first engaging member 215 includes an elastic arm 2151 and a convex bump 2153, the middle part of the elastic arm 2151 is formed with a hollow deformation portion 2152 which enables the elastic arm 2151 to have an elastic force in the radial direction, and the convex bump 2153 is located on the radially inner side of the elastic arm 2151. When the stroller 1000 is in the folded state, the elastic arm 2151 is at least partially located on the radially outer side of the second engaging member 225, and the convex bump 2153 abuts against the second engaging member 225 on the side of the second engaging member 225 close to the second limiting post 221. Specifically, at least one of the convex bump 2153 and the engaging protrusion is provided with a guide slope 2256. In this way, when the stroller 1000 is switched from the unfolded state to the folded state, the first connecting seat 210 will rotate relative to the second connecting seat 220 in the circumferential direction, and the guide slope 2256 is used to guide the first engaging member 215 to move from the side of the second engaging member 225 close to the first limiting post 211 to the side of the second engaging member 225 close to the second limiting post 221. More specifically, the first connecting seat 210 has a convex rib portion 217 protruding towards the second connecting seat 220, specifically, the convex rib portion 217 is formed protruding from the bottom wall of the first accommodating space 212 in the first connecting seat 210 towards the second connecting seat 220. The convex rib portion 217 is arranged around the axial direction, that is, the convex rib portion 217 is arranged in the circumferential direction, and the first engaging member 215 is arranged on the inner circumferential surface of the convex rib portion 217 and protrudes towards the position in the axial direction, that is, the elastic arm 2151 is connected to the inner circumferential surface of the convex rib portion 217, and the first limiting post 211 is also connected to the inner circumferential surface of the convex rib portion 217. More specifically, the engaging protrusion is generally in the structure of a cube, which includes an inner wall 2251 and an outer wall 2252 arranged in the radial direction, and a first side wall 2253 and a second side wall 2254 connected between the inner wall 2251 and the outer wall 2252. The guide slope 2256 is formed by the circular arc transition between the outer wall 2252 and the first side wall 2253, and the engaging portion 2255 is formed by the circular arc transition between the outer wall 2252 and the second side wall 2254. As shown in Figure 3 、 Figure 13 and Figure 14 As shown in FIGS. 22, 23, and 24, when the stroller 1000 is switched from the unfolded state to the folded state, the first connecting seat 210 rotates clockwise around the first pivot to gradually move the first engaging member 215 close to the second engaging member 225 and engage with the second engaging member 225. During the process, the convex 2153 gradually abuts against the guide slope 2256 and moves to the outer wall 2252. During the abutting process, the convex 2153 is extruded to deform the elastic arm 2151 inwardly to the deformation part 2152. When the convex 2153 passes the outer wall 2252 to reach the engaging part 2255, the elastic arm 2151 resets to drive the convex 2153 to engage with the engaging part 2255. In this way, when the stroller 1000 is in the folded state, the first connecting seat 210 and the second connecting seat 220 can be kept relatively fixed without or with less external force, avoiding the stroller handle 110 to pivot relative to the front wheel frame 120 at will.

[0168] Referring to Figure 3 、 Figure 13 and Figure 14 When the stroller 1000 is switched from the unfolded state to the folded state, the stroller handle 110 is first rotated towards the front wheel frame 120, so that the first limiting column 211 moves in the circumferential positive direction away from the third limiting column 231 (i.e., the direction in which the first limiting column 211 moves away from the third limiting column 231 in the circumferential direction is the circumferential positive direction). At the same time, the stroller handle 110 gradually rotates towards the rear wheel frame 130. When the stroller handle 110 abuts against the rear wheel frame 130, the rear wheel frame 130 is pushed to move together towards the front wheel frame 120, so that the third limiting column 231 moves in the circumferential positive direction away from the second limiting column 221 to the groove wall of the movable slot 224, until the convex 2153 engages with the engaging part 2255 in the circumferential positive direction, and the third limiting column 231 abuts against the groove wall of the movable slot 224 away from the second limiting column 221 in the circumferential positive direction. The stroller 1000 then reaches the folded state.

[0169] Referring to Figure 3 、 Figure 13 and Figure 14 ​When the stroller 1000 is converted from the folded state to the unfolded state, the first handle 110 is first rotated away from the front wheel frame 120, so that the first limiting post 211 moves in the reverse direction of the circumference to the third limiting post 231 (that is, the direction in which the first limiting post 211 moves in the circumference to the third limiting post 231 is the reverse direction of the circumference), and at the same time, the convex 2153 also disengages from the engagement part 2255 in the reverse direction of the circumference, until the first limiting post 211 abuts against the third limiting post 231 in the reverse direction of the circumference, the first limiting post 211 can push the third limiting post 231 in the reverse direction of the circumference, so that the third limiting post 231 can slide in the reverse direction of the circumference in the active slot 224 to the slot wall close to the second limiting post 221 side, until the first locking piece 240 is located in the first locking position, so that the relative position relationship between the first limiting post 211 and the second limiting post 221 is fixed, and the third limiting post 231 is at least abutted with the first limiting post 211 in the circumference, at this time, the stroller 1000 reaches the unfolded state. In Figure 3 In the embodiment shown, when the stroller 1000 reaches the unfolded state, the third limiting post 231 is also abutted with the second limiting post 221 in the circumference, that is, the third limiting post 231 is clamped between the first limiting post 211 and the third limiting post 231 in the circumference.

[0170] Referring to Figure 2 In an embodiment, the outer side of the second connecting seat 220 is provided with a first blocking part 226, and the outer side of the third connecting seat 230 is provided with a second blocking part 234. When the driving piece 250 is in the unlocked position, the first locking piece 240 is in the first unlocking position, and the rear wheel frame 130 is spaced apart from the front wheel frame 120 in the circumference, the first blocking part 226 and the second blocking part 234 abut each other in the circumference to keep the included angle between the front wheel frame 120 and the rear wheel frame 130 at the first included angle α1. In this way, it can be avoided that after the first handle 1111 is folded down, the front wheel frame 120 and the rear wheel frame 130 are relatively pivoted without mutual blocking, thereby causing the front wheel frame 120 and the rear wheel frame 130 to be unfolded in a horizontal state (that is, the included angle between the front wheel frame 120 and the rear wheel frame 130 approaches 180 degrees), affecting the folding effect. At the same time, the abutment of the first blocking part 226 and the second blocking part 234 in the circumference can also be used to prompt the user that the front wheel frame 120 and the rear wheel frame 130 are in a position that can be inserted by the second locking piece 280 in the axial direction into the second connecting seat 220 and the third connecting seat 230. Continue to refer to Figure 2, specifically, the first blocking portion 226 is arranged on the outer periphery of the second connecting seat 220, extends towards the third connecting seat 230 along a direction parallel to the axial direction and protrudes outward relative to the outer periphery of the second connecting seat 220. The second blocking portion 234 is arranged on the outer periphery of the third connecting seat 230, extends towards the second connecting seat 220 along a direction parallel to the axial direction and protrudes outward relative to the outer periphery of the third connecting seat 230.

[0171] Continuing to refer to Figure 2 In an embodiment, the outer periphery of the third connecting seat 230 is further provided with a third blocking portion 235, and the outer periphery of the fourth connecting seat 290 is provided with a fourth blocking portion 293. The third blocking portion 235 and the fourth blocking portion 293 abut each other in the circumferential direction to prompt the user that the seat 170 and the rear wheel frame 130 have been placed in a position in which the third locking member 310 can be engaged with the third connecting seat 235 and the fourth connecting seat 290 in the axial direction. Specifically, the third blocking portion 235 extends towards the fourth connecting seat 290 along a direction parallel to the axial direction and protrudes outward relative to the outer periphery of the third connecting seat 230, and the fourth blocking portion 293 extends towards the third connecting seat 230 along a direction parallel to the axial direction and protrudes outward relative to the outer periphery of the fourth connecting seat 290.

[0172] Continuing to refer to Figure 2 In an embodiment, the second blocking portion 234 and the third blocking portion 235 are arranged opposite to each other and connected in a direction parallel to the axial direction. Of course, in other embodiments, the second blocking portion 234 and the third blocking portion 235 can be integrally formed, or the second blocking portion 234 and the third blocking portion 235 are arranged spaced apart and not connected between each other. When the first included angle α1 between the front wheel frame 120 and the rear wheel frame 130 and the fifth included angle α5 between the seat 170 and the rear wheel frame 130 are arranged, the first blocking portion 226 and the fourth blocking portion 293 are arranged opposite to each other in a direction parallel to the axial direction.

[0173] Continuing to refer to Figure 18 and Figure 24In an embodiment, the seat 170 comprises a seat plate 171, a folding back strap 172 passing through the seat plate 171, and a winding mechanism 173 connected to both ends of the folding back strap 172. The two ends of the folding back strap 172 pass through the seat plate 171 respectively to extend from a first surface to a second surface of the seat plate 171, and are connected to the winding mechanism 173 arranged on the second surface. The winding mechanism 173 automatically tightens the folding back strap 172. It is to be noted that in the embodiment, the first surface refers to the surface for supporting the buttocks of the child. When the stroller 1000 is in the extended state, the second surface faces the ground. Arranging the winding mechanism 173 on the second surface can avoid the winding mechanism 173 occupying the space for the child to sit. When the stroller 1000 is in the folded state and the user needs to transfer the stroller 1000 by carrying it on the back, the user can directly pull the folding back strap 172, so that the folding back strap 172 can automatically extend out of the winding mechanism 173. The extended folding back strap 172 can be used by the user to carry or lift the stroller 1000. When the stroller 1000 does not need to be transferred, i.e., the user does not need to use the folding back strap 172, the winding mechanism 173 can automatically tighten the folding back strap 172, i.e., can automatically wind the folding back strap 172. In this way, the excessive folding back strap 172 can be prevented from being exposed on the seat plate 171 to affect the comfort of the child sitting on the seat plate 171.

[0174] Specifically, referring to Figure 25 and Figure 26 , the winding mechanism 173 comprises a winding reel 1731 and a winding spring 1732. One end of the winding spring 1732 is fixedly connected to the second surface, and the winding reel 1731 is sleeved on the winding spring 1732 and connected to the other end of the winding spring 1732. In this way, the winding reel 1731 can rotate with the winding of the winding spring 1732. Specifically, the two ends of the folding back strap 172 are connected to the winding reel 1731 after passing through the seat plate 171, and the connection positions of the two ends of the folding back strap 172 and the winding reel 1731 are arranged opposite to each other along the circumferential direction of the winding reel 1731. More specifically, in the embodiment, the circumferential direction of the winding reel 1731 is provided with two openings 17311, and the ends of the folding back strap 172 are connected to form a knot 1721 (such as a spherical knot or a bow knot) after passing through the two openings 17311. In this way, the knot 1721 can be clamped with the edge of the opening 17311, so that the folding back strap 172 is connected to the winding reel 1731.

[0175] Referring to Figure 24 and Figure 25In an embodiment, the winding mechanism 173 further comprises a cover 1733, which is substantially circular, and is mainly used to cover the reel 1731 and the spring 1732, so as to prevent the reel 1731 and the spring 1732 from being exposed. In this way, the appearance of the stroller 1000 can be improved, and the reel 1731 and the spring 1732 can be prevented from being touched by users or children. Of course, in other embodiments, the cover 1733 can also have other shapes, such as Figure 27 and Figure 28 As shown in FIG. 17, the cover 1733 comprises a main cover body 17331 and an auxiliary cover body 17332. The main cover body 17331 is substantially circular, and an inner cavity of the main cover body 17331 is used to accommodate the reel 1731 and the spring 1732. The auxiliary cover body 17332 is substantially strip-shaped, and an inner cavity of the auxiliary cover body 17332 is used to accommodate the part of the folding strap 172 exposed on the second surface. The auxiliary cover body 17332 is connected with the main cover body 17331, and the inner cavity of the auxiliary cover body 17332 is in communication with the inner cavity of the main cover body 17331. It should be noted that, in the embodiment, the auxiliary cover body 17332 is arranged along the extension direction of the folding strap 172 on the second surface.

[0176] Referring to Figure 28 In an embodiment, the winding mechanism 173 further comprises a guide wheel 1734 and a steering wheel 1735, both of which are rotatably arranged on the second surface of the seat plate 171. The working principle of the guide wheel 1734 and the steering wheel 1735 will be described below by taking one end of the folding strap 172 as an example. Specifically, the rotation axis of the guide wheel 1734 is substantially parallel to the second surface of the seat plate 171, and the rotation axis of the steering wheel 1735 is substantially perpendicular to the second surface of the seat plate 171. Both of them are located on the folding path of the folding strap 172. It should be noted that the rotation axis of the steering wheel 1735 is parallel to the rotation axis of the reel 1731 and the spring 1732. After one end of the folding strap 172 passes through the seat plate 171, it first passes through the gap between the guide wheel 1734 and the second surface, so as to reduce the friction on the folding strap 172 and facilitate the movement of the folding strap 172. Then, the folding strap 172 is wound around the steering wheel 1735 and enters the opening 17311 of the reel 1731 to be connected with the reel 1731. Since the rotation axes of the guide wheel 1734 and the steering wheel 1735 are perpendicular to each other, the folding strap 172 gradually changes from a state parallel to the second surface to a state perpendicular to the second surface during the movement of the folding strap 172 from the guide wheel 1734 to the steering wheel 1735. After the one end of the folding strap 172 passes through the steering wheel 1735, the folding strap 172 can be tangent to the rotation of the reel 1731, so as to facilitate the winding.

[0177] Continuing to refer to Figure 28In one embodiment, the winding mechanism 173 further comprises at least one set of guide ribs 1736, each set of guide ribs 1736 comprises two oppositely arranged guide ribs 1736, and the folding strap 172 is arranged between the two guide ribs 1736. Specifically, a set of guide ribs 1736 is arranged between the guide wheel 1734 and the steering wheel 1735, and the set of guide ribs 1736 is used to assist the folding strap 172 to change from a parallel state to the second surface to a perpendicular state to the second surface. In addition, a set of guide ribs 1736 is also arranged between the steering wheel 1735 and the winding reel 1731, and the set of guide ribs 1736 is used to assist the folding strap 172 to be wound on the winding reel 1731.

[0178] Referring to Figure 29 The second embodiment of the utility model provides a joint structure 200, which can be regarded as a deformation of the joint structure 200 in the first embodiment, the main difference is that the second locking member 280, the third locking member 310 and the second elastic member 320 are omitted, and the third connecting seat 230 and the fourth connecting seat 290 are connected to form a component (which can be called a rotating seat 330). In the case of no conflict, the working principles of the components in the joint structure 200 can refer to the working principles of the corresponding components in the joint structure 200 of the first embodiment, which will not be repeated here. In this way, the joint structure 200 can still be unfolded and folded, therefore, the stroller 1000 adopting the joint structure 200 can also be switched between the extended state and the folded state. It should be noted that in the stroller 1000 adopting the joint structure 200 shown in the second embodiment, the handle 110 is connected with the first connecting seat 210, the front wheel frame 120 is connected with the second connecting seat 120, the rear wheel frame 130 is connected with the rotating seat 330, and the seat 170 is simultaneously pivoted with the front wheel frame 120 and the rear wheel frame 130, when the rear wheel frame 130 is close to the front wheel frame 120, the seat 170 is simultaneously pivoted with the front wheel frame 120 and the rear wheel frame 130 to realize folding.

[0179] The third embodiment of the utility model provides a joint structure 200 (not shown in the figure), which can also be regarded as a deformation of the joint structure 200 in the first embodiment, the main difference is that the first limiting column 211, the second limiting column 221 and the third limiting column 231 are omitted. The relative fixing and pivoting between the second connecting seat 220 and the third connecting seat 230 are only realized by the second locking member 280. Therefore, in the case of no conflict, the working principles of the components in the joint structure 200 can refer to the working principles of the corresponding components in the joint structure 200 of the first embodiment, which will not be repeated here.

[0180] The fourth embodiment of the utility model provides a joint structure 200 (not shown in the drawing), the joint structure 200 can also be regarded as the deformation of the joint structure 200 in the first embodiment, the main difference is that the third locking piece 310 is omitted, the third connecting seat 230 and the fourth connecting seat 290 are connected to form a component (can be called rotating seat 330), the second locking piece 280 is movably arranged in the rotating seat 330, the second elastic piece 320 is abutted between the inner wall of the rotating seat 330 and the second locking piece 280, so that the locking portion 281 of the second locking piece 280 constantly has the tendency of passing through the rotating seat 330 to insert the second connecting seat 220. Therefore, in the case of no conflict, the working principle of each component in the joint structure 200 can refer to the working principle of each corresponding component in the joint structure 200 of the first embodiment, and will not be repeated here. It should be noted that in the stroller 1000 using the joint structure 200 shown in the fourth embodiment, the handle 110 is connected with the first connecting seat 210, the front wheel frame 120 is connected with the second connecting seat 220, the rear wheel frame 130 is connected with the rotating seat 330, and the seat 170 is pivoted with the front wheel frame 120 and the rear wheel frame 130 at the same time. When the rear wheel frame 130 is close to the front wheel frame 120, the seat 170 is pivoted with the front wheel frame 120 and the rear wheel frame 130 at the same time to realize folding.

[0181] The fifth embodiment of the utility model provides a joint structure 200 (not shown in the drawing), the joint structure 200 can also be regarded as the deformation of the joint structure 200 in the first embodiment, the main difference is that when the second locking piece 280 is in the second locking position, the second locking piece 280 directly abuts with the driving piece 250 after sequentially passing through the third connecting seat 230, the second connecting seat 220 and the first locking piece 240. In this way, when the driving piece 250 moves from the initial position to the unlocking position, the driving piece 250 can directly drive the first locking piece 240 to move from the first locking position to the first release position, and also can directly drive the second locking piece 280 to move from the second locking position to the second release position.

[0182] Referring to Figure 30The utility model provides a joint structure 200, this joint structure 200 can also be regarded as the deformation of joint structure 200 in first embodiment, the difference is mainly in, drive 250 is located between first locking piece 240 and second connecting seat 220, second locking piece 280 is located between drive 250 and first locking piece 240, the locking portion 281 of second locking piece 280 is spaced apart along the radial with the abutment portion 251 of drive 250, and the locking portion 281 along with the axial parallel direction protrudes towards second connecting seat 220;First elastic piece 260 is abutted between first locking piece 240 and first connecting seat 210.In the case of not conflict, the working principle of each component in this joint structure 200 can refer to the working principle of each component in the joint structure 200 of the first embodiment, and will not be repeated here. The following mainly describes the difference between the first embodiment and the above.

[0183] Specifically, in this embodiment, when drive 250 is in initial position, drive 250 is located in second connecting seat 220, first locking piece 240 is in first locking position, and first locking piece 240 is clamped with first connecting seat 210 and second connecting seat 220 simultaneously;Second locking piece 280 is in second locking position, and the locking portion 281 is beyond the periphery of drive 250, and sequentially passes through second connecting seat 220 and third connecting seat 230, and abuts with third locking piece 310, so that third locking piece 310 is in third locking position, that is, third locking piece 310 is clamped with third connecting seat 230 and fourth connecting seat 290 simultaneously.

[0184] When drive 250 moves from initial position to unlocking position, drive 250 can drive second locking piece 280 and first locking piece 240 to move in the opposite direction of the axial direction, so that the locking portion 281 of second locking piece 280 is separated from third connecting seat 230, and first locking piece 240 is moved into first connecting seat 210 to reach first release position. During the movement of the locking portion 281 in the direction opposite to the axial direction, the locking portion 281 gradually no longer abuts with the third locking piece 310, and under the reset action of the second elastic piece 320, the second elastic piece 320 can drive the third locking piece 310 to move into the third connecting seat 230 to reach the third release position. It should be noted that in this embodiment, the first release position of the first locking piece 240 is located in the first connecting seat 210, and the third release position of the third locking piece 310 is located in the third connecting seat 230, and the first traction piece 270 is arranged in the front wheel frame 120 through the second connecting seat 220.

[0185] When the driving member 250 is moved from the unlocking position to the initial position, the second locking member 280 and the first locking member 240 are no longer abutted by the driving member 250, and an active gap is left between the driving member 250 and the second locking member 280, thus, under the action of the first elastic member 260, the first locking member 240 is pushed to reset to the first locking position to keep the first connecting seat 210 and the second connecting seat 220 fixed, and the second locking member 280 is pushed to reset to the second locking position to keep the second connecting seat 220 and the third connecting seat 230 fixed. When the second locking member 280 is in the second locking position, the locking portion 281 passes the periphery of the driving member 250 and sequentially passes the second connecting seat 220 and the third connecting seat 230, and pushes the third locking member 310 to make the third locking member 310 in the third locking position, thereby finally keeping the third connecting seat 230 and the fourth connecting seat 290 fixed.

[0186] Referring to Figure 31 The seventh embodiment of the utility model provides a joint structure 200, which can be regarded as a deformation of the joint structure 200 in the sixth embodiment, and the main difference is that the third locking member 310 and the second elastic member 320 are omitted, and the third connecting seat 230 and the fourth connecting seat 290 are connected to form a component (which can be called a rotating seat 330). Similarly, when the driving member 250 is in the initial position, the first locking member 240 is in the first locking position and is clamped with the first connecting seat 210 and the second connecting seat 220 at the same time; the second locking member 280 is in the second locking position, and the locking portion 281 sequentially passes the periphery of the driving member 250 and passes the second connecting seat 220 to enter the rotating seat 330. In the case of no conflict, the working principles of the components in the joint structure 200 can be referred to the working principles of the corresponding components in the joint structure 200 of the first embodiment and the sixth embodiment, which will not be described here. In this way, the joint structure 200 can still realize unfolding and folding, and therefore, the stroller 1000 adopting the joint structure 200 can also switch between the extended state and the folded state. It also needs to be explained that in the stroller 1000 adopting the joint structure 200 shown in the seventh embodiment, the handle 110 is connected with the first connecting seat 210, the front wheel frame 120 is connected with the second connecting seat 120, the rear wheel frame 130 is connected with the rotating seat 330, and the seat 170 is simultaneously pivoted with the front wheel frame 120 and the rear wheel frame 130, when the rear wheel frame 130 is close to the front wheel frame 120, the seat 170 is simultaneously pivoted with the front wheel frame 120 and the rear wheel frame 130 to realize folding.

[0187] Referring to Figure 32The eighth embodiment of the utility model provides a joint structure 200, the joint structure 200 can be regarded as the deformation of the joint structure 200 in the first embodiment, the main difference is that the third locking piece 310 is omitted, the third connecting seat 230 and the fourth connecting seat 290 are connected to form a component (can be called rotating seat 330). In addition, the driving piece 250 is located between the first locking piece 240 and the second connecting seat 220, the second locking piece 280 is located between the driving piece 250 and the second connecting seat 220, the locking portion 281 of the second locking piece 280 protrudes towards the second connecting seat 220 along the direction parallel to the axial direction, the second elastic piece 320 (not shown in the figure) is located in the rotating seat 330 for abutting against the locking portion 281, so that the locking portion 281 constantly has the tendency of moving away from the rotating seat 330, and the first elastic piece 260 abuts between the first connecting seat 210 and the first locking piece 240. Figure 32 Therefore, the working principles of the components in the joint structure 200 are not repeated here, and the working principles of the corresponding components in the joint structure 200 of the first embodiment can be referred to.

[0188] Specifically, in the embodiment, when the driving piece 250 is in the initial position, the driving piece 250 is located in the second connecting seat 220, the first locking piece 240 is in the first locking position, and the first locking piece 240 is clamped with the first connecting seat 210 and the second connecting seat 220 at the same time; the second locking piece 280 is in the second locking position, the locking portion 281 passes through the second connecting seat 220 in turn and enters the rotating seat 330 to abut against the second elastic piece 320 in the rotating seat 330.

[0189] When the driving piece 250 moves from the initial position to the unlocking position, the driving piece 250 can drive the first locking piece 240 to move in the opposite direction of the axial direction, so that the first locking piece 240 moves into the first connecting seat 210 to reach the first release position. Since the driving piece 250 gradually no longer abuts against the second locking piece 280 and leaves a movement gap between the driving piece 250 and the second locking piece 280 during the movement in the opposite direction of the axial direction, under the reset action of the second elastic piece 320, the second elastic piece 320 can drive the locking portion 281 of the second locking piece 280 to exit from the rotating seat 330. It should be noted that in the embodiment, the first release position is located in the first connecting seat 210, and the first traction piece 270 is arranged in the front wheel frame 120 through the second connecting seat 220.

[0190] When the driving member 250 is moved from the unlocking position to the initial position, the driving member 250 pushes the second locking member 280 to move in the positive axial direction to the second locking position, the locking portion 281 passes through the second connecting seat 220 and enters the rotating seat 330 to abut against the second elastic member 320, so that the relative fixation between the second connecting seat 220 and the rotating seat 330 is kept. In addition, after the driving member 250 is moved to the initial position, the first locking member 240 is no longer pressed by the driving member 250, and under the resetting force of the first elastic member 260, the first locking member 240 is driven to move to the first locking position, so that the relative fixation between the first connecting seat 210 and the second connecting seat 220 is kept.

[0191] It is also needed to be explained that in the stroller 1000 adopting the joint structure 200 shown in the eighth embodiment, the handle 110 is connected with the first connecting seat 210, the front wheel frame 120 is connected with the second connecting seat 220, the rear wheel frame 130 is connected with the rotating seat 330, and the seat 170 is pivotally connected with the front wheel frame 120 and the rear wheel frame 130 at the same time, when the rear wheel frame 130 is moved close to the front wheel frame 120, the seat 170 is simultaneously pivoted relative to the front wheel frame 120 and the rear wheel frame 130 to realize the folding.

[0192] Referring to Figure 33 The ninth embodiment of the utility model provides a joint structure 200, which can be regarded as a deformation of the joint structure 200 in the eighth embodiment, and the difference mainly lies in that the position of the second elastic member 320 is changed. In the embodiment, the second elastic member 320 is located between the second locking member 280 and the second connecting seat 220. Therefore, the working principles of the components in the joint structure 200 can be referred to the working principles of the corresponding components in the joint structure 200 in the eighth embodiment, which will not be repeated here.

[0193] Referring to Figure 34The tenth embodiment of the utility model provides a joint structure 200, this joint structure 200 can also be regarded as the deformation of joint structure 200 in the first embodiment, the difference is mainly that driving part 250 is located between first locking piece 240 and second connecting seat 220, second locking piece 280 is located between driving part 250 and second connecting seat 220, the locking portion 281 of second locking piece 280 protrudes along the direction parallel to the axial direction towards second connecting seat 220, in addition, the fifth elastic member 340 is arranged between second connecting seat 220 and second locking piece 280, and the fifth elastic member 340 is used to provide elastic restoring force for the second locking piece 280, so that the second locking piece 280 is kept in the first release position, and the first elastic member 260 is abutted between the first locking piece 240 and the first connecting seat 210. In the case of no conflict, the working principle of each component in the joint structure 200 can be referred to the working principle of each corresponding component in the first embodiment of the joint structure 200, which will not be repeated here. The following mainly describes the differences between the first embodiment and the above-mentioned first embodiment.

[0194] Specifically, in the embodiment, when the driving part 250 is in the initial position, the driving part 250 is located in the second connecting seat 220, the first locking piece 240 is in the first locking position, and the first locking piece 240 is simultaneously clamped with the first connecting seat 210 and the second connecting seat 220; the second locking piece 280 is in the second locking position, and the locking portion 281 passes through the second connecting seat 220 and the third connecting seat 230 in turn and abuts against the third locking piece 310, so that the third locking piece 310 is in the third locking position, that is, the third locking piece 310 is simultaneously clamped with the third connecting seat 230 and the fourth connecting seat 290.

[0195] When the driving part 250 moves from the initial position to the unlocking position, the driving part 250 can drive the first locking piece 240 to move in the opposite direction of the axial direction, so that the first locking piece 240 moves into the first connecting seat 210 to reach the first release position. During the movement of the driving part 250 in the opposite direction of the axial direction, the driving part 250 gradually no longer abuts against the second locking piece 280, and under the resetting action of the fifth elastic member 340, the second locking piece 280 can be driven to move to the second release position to retreat from the third connecting seat 230. When the locking portion 281 of the second locking piece 280 moves in the direction parallel to the opposite direction of the axial direction, the third locking piece 310 is no longer abutted by the locking portion 281, and under the action of the second elastic member 320, the third locking piece 310 can be moved to the third release position. It should be noted that in the embodiment, the first release position of the first locking piece 240 is located in the first connecting seat 210, the third release position of the third locking piece 310 is located in the third connecting seat 230, and the first traction member 270 is arranged in the front wheel frame 120 through the second connecting seat 220.

[0196] When the driving member 250 is moved from the unlocking position to the initial position, the driving member 250 pushes the second locking member 280 to move in the positive direction of the axial direction to the second locking position, the locking portion 281 passes through the second connecting seat 220 and the third connecting seat 230 and abuts against the third locking member 310, so that the fourth connecting seat 290 and the third connecting seat 230 are kept relatively fixed, and the third connecting seat 230 and the second connecting seat 220 are kept relatively fixed. In addition, after the driving member 250 is moved to the initial position, the first locking member 240 is no longer pressed by the driving member 250, and under the restoring force of the first elastic member 260, the first locking member 240 is driven to move to the first locking position, so that the first connecting seat 210 and the second connecting seat 220 are kept relatively fixed.

[0197] Referring to Figures 35 to 41 , the eleventh embodiment of the present application provides a joint structure 200, which can also be regarded as a deformation of the joint structure 200 in the first embodiment, and the difference lies in that:

[0198] The first connecting seat 210 is provided with a first pushing portion 216, which is arranged in the circumferential direction and spaced from the first limiting column 211, and the first pushing portion 216 can be elastically deformed in the radial direction.

[0199] Referring to Figure 38 , when the stroller 1000 is in the folded state, in the circumferential direction, the first pushing portion 216 is located between the first limiting column 211 and the third limiting column 231, and the third limiting column 231 is located between the first pushing portion 216 and the second limiting column 221, and the first pushing portion 216 is used to push the third limiting column 231 towards the second limiting column 221.

[0200] Referring to Figure 40 , when the stroller 1000 is in the unfolded state, in the circumferential direction, the third limiting column 231 is located between the first limiting column 211 and the first pushing portion 216, that is, the first pushing portion 216 and the first limiting column 211 are located on both sides of the third limiting column 231 in the circumferential direction, and the first pushing portion 216 and the third limiting column 231 are arranged in the circumferential direction. It can be seen that at this time, the third limiting column 231 is located between the first limiting column 211 and the first pushing portion 216, and also between the first limiting column 211 and the second limiting column 221. As Figure 40 shown, when the stroller 1000 is in the unfolded state, part of the first pushing portion 216 is also arranged opposite to the second limiting column 221 in the direction parallel to the axial direction.

[0201] Please refer to Figure 38 and Figure 40In the process of switching the stroller 1000 from the folded state to the unfolded state, the first pushing portion 216 first abuts against the third limiting column 231 in the opposite direction of the circumference compared with the first limiting column 211, and pushes the third limiting column 231 to slide towards the groove wall on the side of the movable groove 224 close to the second limiting column 221, which makes the handrail 110 rotate and then drive the rear wheel frame 130 to rotate along the circumference away from the side of the front wheel frame 120. When the third limiting column 231 abuts against the groove wall on the side of the movable groove 224 close to the second limiting column 221, the included angle between the rear wheel frame 130 and the front wheel frame 120 is the first included angle a1, at this time, the rear wheel frame 130, the front wheel frame 120 and the supporting surface (such as the ground) form a triangular stable structure, and the third limiting column 231 cannot move relative to the second limiting column 221. However, the first pushing portion 216 can continue to move in the opposite direction of the circumference relative to the third limiting column 231, and during this period, the first pushing portion 216 will elastically deform in the radial direction due to the obstruction of the third limiting column 231, and can move to the radial outside of the third limiting column 231 in the opposite direction of the circumference. Then, the first pushing portion 216 continues to move until it passes the third limiting column 231 and reaches the side of the third limiting column 231 away from the first limiting column 211 in the circumference. At this time, the first pushing portion 216 restores to the shape when it is not in contact with the third limiting column 231 in the radial direction. In this process, the first limiting column 211 moves in the opposite direction of the circumference towards the direction close to the third limiting column 231 until it abuts against the third limiting column 231, and at this time, the stroller 1000 is switched and is in the unfolded state.

[0202] It can be seen that the present embodiment does not need to push the third limiting column 231 towards the groove wall on the side of the movable groove 224 close to the second limiting column 221 by the first limiting column 211 to realize the relative opening of the rear wheel frame 130 and the front wheel frame 120, and the present embodiment accelerates the unfolding speed of the stroller 1000 and improves the switching rate.

[0203] Referring to Figure 36 、 Figure 38 and Figure 40As shown, the first pushing portion 216 is in the form of an elastic arm, and the extending direction of the elastic arm intersects the circumferential direction. Specifically, the protruding ridge 217 in the embodiment is discontinuously arranged along the circumferential direction compared with the first embodiment, that is, the protruding ridge 217 is discontinuously distributed along the circumferential direction. The protruding ridge 217 is formed with a gap, the first pushing portion 216 is located in the gap, one end of the first pushing portion 216 is connected with the edge on one side of the gap in the circumferential direction, the other end of the first pushing portion 216 is disconnected with the edge on the other side of the gap in the circumferential direction, and the other end of the first pushing portion 216 extends inwardly towards the area surrounded by the protruding ridge 217, and is used for pushing the third limiting column 231. When the stroller 1000 is converted from the folded state to the unfolded state, the first pushing portion 216 can be deformed along the radial direction towards the corresponding gap to move to the radially outer side of the third limiting column 231.

[0204] Referring to Figure 38 and Figure 39 , the third limiting column 231 is provided with an abutting surface 2311 on the side close to the first limiting column 211. The abutting surface 2311 is located on the path of the first pushing portion 216 moving in the opposite direction of the circumferential direction, so that the first pushing portion 216 can effectively abut against the third limiting column 231 on the side close to the first limiting column 211 when the first pushing portion 216 moves in the opposite direction of the circumferential direction, so as to push the third limiting column 231 in the opposite direction of the circumferential direction to move together. When the first pushing portion 216 abuts against the abutting surface 2311, the included angle between the extending direction of the abutting surface 2311 and the extending direction of the first pushing portion 216 is between 65° and 75°, so that the first pushing portion 216 is not easy to move to the radially outer side of the third limiting column 231 when pushing the third limiting column 231 in the opposite direction of the circumferential direction.

[0205] In the direction parallel to the axial direction, the second limiting column 221 is located on the side of the moving track of the first pushing portion 216 in the circumferential direction, so that the first pushing portion 216 will not abut against the second limiting column 221 when moving in the circumferential direction, and can be pivoted at any angle relative to the second limiting column 221. Referring to Figure 40 When the stroller 1000 is in the unfolded state, the first pushing portion 216 can also be completely staggered with the second limiting column 221 in the direction parallel to the axial direction, that is, the first pushing portion 216 can be completely located on the side of the second limiting column 221 away from the third limiting column 231, rather than being Figure 40As shown, a portion of the first pushing portion 216 is also arranged opposite to the second limiting column 221 in the direction parallel to the axial direction. Specifically, the first pushing portion 216 is formed to protrude from the bottom wall of the first accommodating space 212 in the first connecting seat 210 towards the second connecting seat 220 in the direction parallel to the axial direction, and the extension length of the first pushing portion 216 in the direction parallel to the axial direction, i.e., the length of the extension of the first pushing portion 216 towards the second connecting seat 220, is less than or equal to the distance between the second limiting column 221 and the first connecting seat 210 in the direction parallel to the axial direction. It can be understood that the plane where the end face of the first pushing portion 216 towards the second connecting seat 220 is located is arranged in the direction parallel to the axial direction to be spaced apart from or just flush with the plane where the end face of the second limiting column 221 towards the first connecting seat 210 is located. Then, in the process of switching the stroller 1000 from the folded state to the unfolded state, the second limiting column 221 will not hinder the rotation of the first pushing portion 216 in the circumferential direction.

[0206] Referring to Figure 35 and Figure 36 In the joint structure 200 provided in the embodiment, the first connecting seat 210 is not provided with the first clamping member 215, and the second connecting seat 220 is not provided with the second clamping member 225. However, in other embodiments, the first connecting seat 210 in the eleventh embodiment can also be provided with the first clamping member 215, and the second connecting seat 220 can also be provided with the second clamping member 225.

[0207] Referring to Figure 35 、 Figure 36 and Figure 38 The first connecting seat 210 is further provided with a fourth limiting column 218, which extends towards the second connecting seat 220 in the direction parallel to the axial direction and is arranged in the circumferential direction to be spaced apart from the first limiting column 211. In the direction parallel to the axial direction, the second limiting column 221 is located on one side of the circumferential movement track of the fourth limiting column 218, which makes the fourth limiting column 218 not circumferentially abut against the second limiting column 221 and can be pivoted at any angle relative to the second limiting column 221. In the embodiment, the first limiting column 211 and the fourth limiting column 218 are arranged opposite to each other in the radial direction.

[0208] It should be noted that the fourth limiting column 218 extends towards the second connecting seat 220 and is arranged to be spaced apart from the axial direction, and the fourth limiting column 218 extends in the direction parallel to the axial direction, which is a preferred embodiment. Specifically, the fourth limiting column 218 is also formed to protrude from the bottom wall of the first accommodating space 212 in the first connecting seat 210 towards the second connecting seat 220.

[0209] Specifically, the fourth limiting column 218 has an extension length in the direction parallel to the axial direction, i.e., the length of the fourth limiting column 218 extending towards the second connecting seat 220, which is less than or equal to the distance between the second limiting column 221 and the first connecting seat 210 in the direction parallel to the axial direction. It can be understood that the plane where the end surface of the fourth limiting column 218 faces and the plane where the end surface of the second limiting column 221 faces are spaced apart or just flush in the direction parallel to the axial direction. In the process of switching the stroller 1000 between the folded state and the unfolded state, the second limiting column 221 does not hinder the fourth limiting column 218 from rotating in the circumferential direction.

[0210] Referring to Figure 40 When the stroller 1000 is in the unfolded state, the third limiting column 231 is located between the first limiting column 211 and the fourth limiting column 218 in the circumferential direction, and the third limiting column 231 is also located between the first limiting column 211 and the second limiting column 221 in the circumferential direction. The fourth limiting column 218 is used to push the third limiting column 231 in the positive direction of the circumferential direction, so as to move the third limiting column 231 away from the second limiting column 221. In the illustrated embodiment, the fourth limiting column 218 is arranged away from the third limiting column 231 compared with the second limiting column 221, and the fourth limiting column 218 is completely staggered with the second limiting column 221 in the direction parallel to the axial direction, i.e., in the circumferential direction, the fourth limiting column 218 and the first limiting column 211 are respectively located on the two sides of the second limiting column 221. Therefore, when the fourth limiting column 218 moves in the positive direction of the circumferential direction, it needs to pass the second limiting column 221 first, and then push the third limiting column 231 away from the second limiting column 221.

[0211] Referring to Figure 38 When the stroller 1000 is in the folded state, the third limiting column 231 is still located between the first limiting column 211 and the fourth limiting column 218 in the circumferential direction, and the third limiting column 231 is also still located between the first limiting column 211 and the second limiting column 221 in the circumferential direction. However, at this time, the fourth limiting column 218 is arranged closer to the third limiting column 231 compared with the second limiting column 221. In the illustrated embodiment, the fourth limiting column 218 is still completely staggered with the second limiting column 221 in the direction parallel to the axial direction.

[0212] Please refer to Figure 38 and Figure 40In the process of switching the stroller 1000 from the unfolded state to the folded state, the fourth limiting column 218 moves along the positive direction of the circumferential direction to approach the third limiting column 231, and when the fourth limiting column 218 moves to a position opposite to the second limiting column 221 in the direction parallel to the axial direction, the fourth limiting column 218 and the second limiting column 221 simultaneously abut against one side of the third limiting column 231 away from the first limiting column 211 in the circumferential direction. When the fourth limiting column 218 continues to move along the positive direction of the circumferential direction, the fourth limiting column 218 pushes the third limiting column 231 to move along the positive direction of the circumferential direction in the movable slot 224 to the side of the slot wall away from the second limiting column 221, until the third limiting column 231 abuts against the slot wall of the movable slot 224 away from the second limiting column 221 in the positive direction of the circumferential direction. At this time, the third limiting column 231 is clamped between the fourth limiting column 218 and the slot wall of the movable slot 224 away from the second limiting column 221 in the circumferential direction, and thus the stroller 1000 is switched and is in the folded state.

[0213] In the present embodiment, the third limiting column 231 is located between the first limiting column 211 and the fourth limiting column 218 in the circumferential direction, regardless of whether the stroller 1000 is in the unfolded state or the folded state.

[0214] Compared with the first embodiment, the illustrated embodiment not only pushes the third limiting column 231 to move away from the slot wall of the movable slot 224 by the stroller handle frame 110 pushing the rear wheel frame 130 to move together to approach the front wheel frame 120, but also pushes the third limiting column 231 to move away from the slot wall of the movable slot 224 by the fourth limiting column 218.

[0215] Referring to Figure 36 , Figure 38 and Figure 40 , the first pushing part 216 is also located between the first limiting column 211 and the fourth limiting column 218 in the circumferential direction. The distance between the first pushing part 216 and the fourth limiting column 218 in the circumferential direction is greater than or equal to the maximum width of the third limiting column 231 in the circumferential direction.

[0216] When the stroller 1000 is in the unfolded state, referring to Figure 40 , the first pushing part 216 and the third limiting column 231 are both located between the first limiting column 211 and the fourth limiting column 218 in the circumferential direction, and the third limiting column 231 is located between the first limiting column 211 and the first pushing part 216 in the circumferential direction, and the fourth limiting column 218 is arranged away from the third limiting column 231 in the circumferential direction compared with the first pushing part 216.

[0217] In the process of switching the stroller 1000 from the unfolded state to the folded state, when the first pushing part 216 moves in the positive direction of the circumferential direction, it will first pass the second limiting column 221 to contact the third limiting column 231, and the first pushing part 216 will elastically deform in the radial direction and move to the radial outside of the third limiting column 231. Then, the first pushing part 216 continues to move to the side of the third limiting column 231 close to the first limiting column 211 in the circumferential direction, and recovers the elastic deformation at this position. At the same time, the fourth limiting column 218 moves in the positive direction of the circumferential direction to the position opposite to the second limiting column 221 in the direction parallel to the axial direction, at this time, the fourth limiting column 218 and the first pushing part 216 are respectively located on the two sides of the third limiting column 231 in the circumferential direction. Specifically, the end of the first pushing part 216 not connected with the convex rib part 217 and the fourth limiting column 218 are respectively located on the two sides of the third limiting column 231 in the circumferential direction, that is, in the circumferential direction, the third limiting column 231 is located between the first pushing part 216 and the fourth limiting column 218. When the fourth limiting column 218 continues to move in the positive direction of the circumferential direction relative to the second limiting column 221, it will push the third limiting column 231 to move to the groove wall of the movable groove 224 away from the second limiting column 221 side, at this time, the stroller 1000 completes the conversion and reaches the folded state.

[0218] Referring to Figure 39 and Figure 40 , the side of the third limiting column 231 close to the second limiting column 221 is provided with a pressing surface 2312, which is located on the trajectory of the first pushing part 216 moving in the positive direction of the circumferential direction, so that the first pushing part 216 can effectively contact the pressing surface 2312 in the positive direction of the circumferential direction, and when the first pushing part 216 contacts the pressing surface 2312, the extension direction of the pressing surface 2312 is substantially parallel to the extension direction of the first pushing part 216, for example, the included angle between them is between 0° and 25°, so that when the first pushing part 216 contacts the third limiting column 231 in the positive direction of the circumferential direction, it will not produce too much resistance to smoothly move to the radial outside of the third limiting column 231 in the positive direction of the circumferential direction.

[0219] Since the second limiting column 221 is located on one side of the circumferential moving track of the fourth limiting column 218 and on one side of the circumferential moving track of the first pushing part 216 in the direction parallel to the axial direction, the fourth limiting column 218 and the first pushing part 216 can pass the second limiting column 221 when moving in the opposite circumferential direction during the switching of the stroller 1000 from the folded state to the unfolded state, so that the third limiting column 231 can abut to the second limiting column 221 in the opposite circumferential direction, that is, the third limiting column 231 can abut to the second limiting column 221 smoothly under the pushing of the first pushing part 216 in the opposite circumferential direction without being stopped by the abutment of the fourth limiting column 218 and the second limiting column 221 in the opposite circumferential direction, and at the same time, the first limiting column 211 can also move in the opposite circumferential direction smoothly until abutting to the third limiting column 231 without being stopped by the abutment of the first pushing part 216 and the second limiting column 221 in the opposite circumferential direction.

[0220] Referring to Figure 35 and Figure 41 , the stroller 1000 is additionally provided with a third traction member 180. One end of the third traction member 180 is connected with the first pushing frame 111, and the other end is connected with the seat 170. Preferably, the third traction member 180 is a fabric belt. When the first pushing frame 111 is unfolded relative to the second pushing frame 112, the seat 170 rotates clockwise under the traction of the third traction member 180, that is, pivots away from the side of the rear wheel frame 130 in the circumferential direction.

[0221] Referring to Figure 35 , Figure 37 and Figure 41 , the fourth connecting seat 290 in the embodiment is additionally provided with a second pushing part 294, which is arranged on the side of the fourth connecting seat 290 facing the third connecting seat 230, and the second pushing part 294 is columnar and extends into the third connecting seat 230 in the direction parallel to the axial direction. The second connecting seat 220 is also additionally provided with a third pushing part 227, which is arranged on the side of the second connecting seat 220 away from the first connecting seat 210 and extends into the third connecting seat 230 in the direction parallel to the axial direction, and the second pushing part 294 and the third pushing part 227 are oppositely arranged in the circumferential direction, and the third pushing part 227 is located in front of the second pushing part 294 in the direction in which the seat 170 pivots away from the rear wheel frame 130. The third connecting seat 230 is provided with a limiting groove 236 accommodating the second pushing part 294 and the third pushing part 227, which extends through the third connecting seat 230 in the direction parallel to the axial direction and extends in the circumferential direction, and the limiting groove 236 can be used for the second pushing part 294 and the third pushing part 227 to move in the circumferential direction.

[0222] It is to be noted that the second pushing portion 294 extends towards the third connecting seat 230 and is axially spaced apart from the third connecting seat 230; specifically, the second pushing portion 294 is formed protruding from the bottom wall of the fourth accommodating space 291 in the fourth connecting seat 290 towards the third connecting seat 230. The third pushing portion 227 extends towards the third connecting seat 230 and is axially spaced apart from the third connecting seat 230; specifically, the third pushing portion 227 is formed protruding from the surface of the second connecting seat 220 facing the third connecting seat 230 towards the third connecting seat 230. The second pushing portion 294 and the third pushing portion 227 preferably extend in a direction parallel to the axial direction.

[0223] When the seat 170 is pivoted in the circumferential direction away from the rear wheel frame 130, the second pushing portion 294 of the seat 170 pushes the third abutting portion 227 to rotate in the same direction. In turn, the front wheel frame 120 is also pivoted in the circumferential direction away from the rear wheel frame 130 to complete the unfolding of the stroller 1000 more quickly.

[0224] When the third pushing portion 227 moves along the seat 170 away from the rear wheel frame 130 until abutting against the end of the limiting groove 236 close to the third pushing portion 227 in the circumferential direction, the included angle between the front wheel frame 120 and the rear wheel frame 130 is just the first included angle a1. When the second pushing portion 294 moves along the seat 170 towards the rear wheel frame 130 until abutting against the end of the limiting groove 236 close to the second pushing portion 294 in the circumferential direction, the included angle between the seat 170 and the rear wheel frame 130 is just the included angle between the seat 170 and the rear wheel frame 130 when the stroller 1000 is in the folded state. That is, the two ends of the limiting groove 236 in the circumferential direction limit the rotation stroke of the second pushing portion 294 and the third pushing portion 227, respectively.

[0225] The process of switching the stroller 1000 from the folded state to the unfolded state includes a first stage and a second stage. In the first stage, the handle frame 110 rotates in the circumferential direction away from the front wheel frame 120, and the handle frame 110 drives the rear wheel frame 130 to rotate in the circumferential direction away from the front wheel frame 120. In the second stage, the first pushing frame 111 unfolds relative to the second pushing frame 112, and the first pushing frame 111 drives the seat 170 to rotate in the circumferential direction away from the rear wheel frame 130 through the third traction member 180, and the seat 170 drives the front wheel frame 120 to rotate in the circumferential direction away from the rear wheel frame 130.

[0226] Referring to Figure 35 , Figure 37 and Figure 41The third connecting seat 230 is provided with a guide portion 237 on the side facing the fourth connecting seat 290. The guide portion 237 extends along the circumferential direction around the axial direction and protrudes towards the fourth connecting seat 290 along the direction parallel to the axial direction. Specifically, the guide portion 237 is formed by protruding from the bottom wall of the third accommodating space 232 in the third connecting seat 230 towards the fourth connecting seat 290. The second locking member 280 and the third locking member 310 are sleeved on the radially outer side of the guide portion 237. The guide portion 237 is used to guide the axial movement of the second locking member 280 and the third locking member 310. The guide portion 237 is provided with a plurality of guide grooves 238. The plurality of guide grooves 238 are recessed from the circumferential surface of the guide portion 237 towards the axial direction and are arranged at intervals along the circumferential direction. The plurality of guide grooves 238 are used to one-to-one correspondingly accommodate a plurality of clamping portions 283, guide the corresponding clamping portions 283 to move along the direction parallel to the axial direction, and limit the rotation of the clamping portions 283 along the circumferential direction, thereby limiting the rotation of the second locking member 280 around the axial direction. In other embodiments, only one clamping portion 283 and one guide groove 238 can be provided.

[0227] It should be noted that the terms "first", "second", "third", "fourth", "fifth" and the like in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0228] The technical features of the above embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0229] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An articulating structure, characterized by, The joint structure comprises: a first connecting seat, a second connecting seat and a third connecting seat, the first connecting seat, the second connecting seat and the third connecting seat are pivotally connected to each other along an axial direction, the second connecting seat is located between the first connecting seat and the third connecting seat along the axial direction, the first connecting seat is provided with a first limiting column, the second connecting seat is provided with a second limiting column, and the third connecting seat is provided with a third limiting column, the first limiting column, the third limiting column and the second limiting column are sequentially arranged along a circumferential direction; and a first locking member movably arranged between the first connecting seat and the second connecting seat and having a first locking position and a first release position, and located on a radial side of the first limiting column, the second limiting column and the third limiting column, when the first locking member is in the first locking position, the first connecting seat, the second connecting seat and the third connecting seat are relatively fixed, and the third limiting column abuts against at least one of the first limiting column and the second limiting column; when the first locking member is in the first release position, the first connecting seat and the third connecting seat can be pivoted relative to the second connecting seat.

2. The joint structure according to claim 1, characterized in that, The first limiting column protrudes towards the second connecting seat, the second limiting column protrudes towards the first connecting seat, and the third limiting column protrudes towards the first connecting seat and passes through the second connecting seat, the second connecting seat is provided with a movable slot for the third limiting column to move along the circumferential direction, and the first limiting column and the third limiting column can move along the circumferential direction in the second connecting seat.

3. The joint structure of claim 1, wherein The first locking member is located on the radial side of the first limiting column, the second limiting column and the third limiting column.

4. The joint structure of claim 1, wherein The joint structure further comprises a driving member movably arranged between the first connecting seat and the second connecting seat and having an initial position and an unlocking position, when the driving member moves from the initial position to the unlocking position, the driving member drives the first locking member to move from the first locking position to the first release position, the driving member and the first locking member are arranged adjacent to each other along the axial direction, and the driving member and the first locking member are located on the radial side of the first limiting column, the second limiting column and the third limiting column.

5. The joint structure of claim 1, wherein The joint structure further comprises a second locking member movably arranged in the joint structure and provided with at least one locking portion, the locking portion is arranged to be spaced apart from the axial direction, the second locking member has a second locking position and a second release position, when the first locking member is in the first locking position, the second locking member is in the second locking position, and the at least one locking portion passes through the third connecting seat and the second connecting seat, when the first locking member is in the first release position, the second locking member is in the second release position, and the at least one locking portion only passes through the third connecting seat or the second connecting seat.

6. The joint structure according to claim 5, wherein When the first locking member moves from the first locking position to the first release position, the first locking member drives the second locking member to move from the second locking position to the second release position.

7. A cart characterized by, The stroller further comprises: The stroller further comprises: When the stroller is in the unfolded state, the first locking member is in the first locking position, and the handle frame, the front wheel frame, and the rear wheel frame are arranged in a circumferential direction. When the stroller is in the folded state, the handle frame is close to the rear wheel frame in the circumferential direction, and the rear wheel frame is close to the front wheel frame in the circumferential direction.

8. The cart of claim 7, wherein, When the stroller is in the folded state, the first limiting column, the third limiting column, and the second limiting column are arranged in the circumferential direction.

9. The cart of claim 7, wherein, The stroller further comprises: The stroller further comprises:

10. The stroller of claim 7, wherein The first connecting seat is provided with a first clamping member, and the second connecting seat is provided with a second clamping member, the first clamping member and the second clamping member are located between the first limiting column and the second limiting column in the circumferential direction, and are located on a side of the first limiting column and the second limiting column away from the third limiting column in the circumferential direction; When the stroller is in the folded state, the first clamping member abuts against the second clamping member on a side of the second clamping member close to the second limiting column.

Images