Folding joint and carrier

Abstract

A folding joint (103) and a carrier (101). The folding joint comprises a joint body (100), a locking mechanism (200) and a safety lock mechanism (300). The joint body comprises at least two connection seats which are pivotally connected to each other. The locking mechanism has a locked state and an unlocked state. When the locking mechanism is in the locked state, the at least two connection seats are restricted from performing relative rotation; and when the locking mechanism is in the unlocked state, the at least two connection seats are allowed to perform relative rotation. The safety lock mechanism has a locked state and an unlocked state. When the safety lock mechanism is in the locked state, the locking mechanism is restricted from switching to the unlocked state thereof. When the safety lock mechanism is in the unlocked state, the locking mechanism is allowed to switch to the unlocked state thereof. The folding joint and the carrier can prevent a misoperation during use, thereby improving the safety performance of the carrier.

Description

Folding joints and vehicles Technical Field

[0001] This application relates to the technical field of children's vehicles and pet vehicles, and in particular to a folding joint and a vehicle having the folding joint. Background Technology

[0002] Commercially available vehicles, including baby carriers and pet carriers such as strollers, generally feature foldable frames for easy carrying and storage. For ease of operation, most folding mechanisms involve pulling the frame together; that is, the folding joints are released by the folding mechanism, allowing the frame components to fold together. However, these folding mechanisms are often located in the seat area, which can easily lead to accidental operation and pose a safety hazard. Summary of the Invention

[0003] Therefore, it is necessary to provide a folding joint and a carrier that can prevent misoperation during use, thereby improving the safety performance of the carrier.

[0004] A retractable joint, comprising:

[0005] The joint body includes at least two connecting seats that are pivotally connected to each other;

[0006] A locking mechanism having a first locked state and a first unlocked state, wherein when the locking mechanism is in the first locked state, the at least two connecting seats are restricted from relative rotation, and when the locking mechanism is in the first unlocked state, the at least two connecting seats are allowed to rotate relative to each other; and

[0007] The safety lock mechanism has a second locking state and a second unlocking state. When the safety lock mechanism is in the second locking state, the locking mechanism is restricted from switching to the first unlocking state. When the safety lock mechanism is in the second unlocking state, the locking mechanism is allowed to switch to the first unlocking state.

[0008] In the aforementioned folding joint, the joint body includes at least two connecting seats pivotally connected to each other. The locking mechanism can switch between a first locked state and a first unlocked state to restrict or allow relative rotation of at least two connecting seats. The safety lock mechanism can switch between a second locked state and a second unlocked state to restrict or allow the locking mechanism to switch to the first unlocked state. In other words, the unlocking member can only be operated to release the locking mechanism when the safety lock mechanism is released. This prevents accidental activation of the locking mechanism from causing the folding joint or the vehicle to fold unexpectedly, thus improving the vehicle's safety performance.

[0009] In one embodiment, the security lock mechanism includes:

[0010] The safety lock body is movable between a first position and a second position, and the safety lock body has a first locking part;

[0011] The locking mechanism includes a release element, which is operable to drive the locking mechanism to switch from the first locked state to the first unlocked state. The release element has a second locking part. When the safety lock mechanism is in the second locked state, the safety lock body is in the first position, and the first locking part and the second locking part are locked together. When the safety lock mechanism is in the second unlocked state, the safety lock body is in the second position, and the first locking part and the second locking part are released.

[0012] In one embodiment, the first locking part is a snap-fit ​​post, the second locking part is a snap-fit ​​groove that can engage with the snap-fit ​​post, and the unlocking member also has a guide slope that is adapted to push against the snap-fit ​​post to guide the snap-fit ​​post into the snap-fit ​​groove.

[0013] In one embodiment, the safety lock mechanism further includes a retainer, the safety lock body has a retaining protrusion, the safety lock body is slidable between a first position and a second position, the second position being located in front of the first position in a first direction, when the safety lock body is in the first position, the retainer is located in front of the retaining protrusion in the first direction, and during the movement of the safety lock body from the first position to the second position, the retaining protrusion passes over the retainer and is located in front of the retainer in the first direction, and the retaining protrusion abuts against the retainer to hold the safety lock body in the second position.

[0014] In one embodiment, the safety lock mechanism further includes a first reset member adapted to apply force to the safety lock body to move the safety lock body to the first position; the safety lock body can be operated to move to the second position.

[0015] In one embodiment, the security lock mechanism further includes:

[0016] The second traction member has a first end and a second end, the first end being connected to the safety lock body, and the second end being adapted to be operated to move the safety lock body from the first position to the second position.

[0017] In one embodiment, the safety lock body is slidable between the first position and the second position, the second position being located in front of the first position in a first direction, and the safety lock mechanism further includes:

[0018] A threading ring is located in front of the safety lock body in the first direction. The second traction member is at least partially threaded through the threading ring, and the first end and the second end of the second traction member are located in front of the threading ring in the opposite direction to the first direction.

[0019] In one embodiment, the locking mechanism includes:

[0020] The locking element is movable between a locked position and an unlocked position;

[0021] When the locking member is in the locked position, it is simultaneously located in the at least two connecting seats, thereby restricting the relative rotation of the at least two connecting seats; when the locking member is in the unlocked position, it is released from at least one of the at least two connecting seats, thereby allowing the at least two connecting seats to rotate relative to each other.

[0022] In one embodiment, the locking mechanism further includes a second reset member adapted to apply force to the locking member to move the locking member toward the locked position; the locking mechanism has a release member drivenly connected to the locking member, the release member being operable to drive the locking member to move from the locked position to the release position.

[0023] In one embodiment, the security lock mechanism includes:

[0024] The safety lock body is slidable between a first position and a second position. When the safety lock mechanism is in the second locked state, the safety lock body is in the first position; when the safety lock mechanism is in the second unlocked state, the safety lock body is in the second position.

[0025] A connector is used to connect the safety lock body and the release mechanism;

[0026] When the unlocking member is operated to drive the locking member to move from the locked position to the unlocked position, the unlocking member drives the safety lock body to move from the second position to the first position via the connecting member.

[0027] In one embodiment, the locking member is pivotally connected to the joint body via a pivot, the locking member has a driven portion, the locking member has a driving end, the driving end abuts against the driven portion, the connecting member is connected to the locking member at a first fixing portion of the locking member, and the driving end and the first fixing portion are respectively located on both sides of the pivot.

[0028] A vehicle comprising:

[0029] Support frame; and

[0030] The folding joint described in any of the above is connected to the support frame to allow the support frame to unfold or fold.

[0031] In one embodiment, the support frame includes at least two frames, which are respectively connected to or integrally formed with the at least two connecting seats in a one-to-one correspondence.

[0032] In one embodiment, the vehicle is a stroller, the support frame is a vehicle frame, the at least two frames include a handlebar frame, a front wheel frame and a rear wheel frame, and the at least two connecting seats include a handlebar connecting seat, a front connecting seat and a rear connecting seat. The handlebar frame, the front wheel frame and the rear wheel frame are respectively connected to the handlebar connecting seat, the front connecting seat and the rear connecting seat in a one-to-one correspondence or are integrally formed in a one-to-one correspondence.

[0033] In one embodiment, the vehicle includes two folding joints, which are respectively disposed on opposite sides of the support frame. The vehicle also includes a first traction member, the two ends of which are respectively connected to the locking mechanisms of the two folding joints. When the safety lock mechanism is in the second unlocking state, the first traction member can be operated to drive the two locking mechanisms to switch to the first unlocking state.

[0034] In one embodiment, the security lock mechanism further includes:

[0035] The second traction member has a first end and a second end, the first end being connected to the safety lock mechanism, and the second end being adapted to be operated to switch the safety lock mechanism from the second locked state to the second unlocked state.

[0036] In one embodiment, the vehicle further includes a shield covering the support frame, the shield having a first through hole and a first surface, wherein at least the second end of the second traction member is exposed through the first through hole on the first surface of the shield for operation.

[0037] In one embodiment, the vehicle further includes:

[0038] A limiting ring is connected to the first traction member, and at least part of the second traction member passes through the limiting ring and is movable relative to the limiting ring, with the first end and the second end located on both sides of the limiting ring respectively.

[0039] In one embodiment, the vehicle further includes a limiting ring connected to the first traction member, and at least a portion of the second traction member passes through the limiting ring. The shielding member also has a second surface opposite to the first surface, the limiting ring is exposed on the second surface of the shielding member, and at least the second end of the second traction member is exposed on the first surface of the shielding member through the first through hole.

[0040] In one embodiment, the carrier further includes a shielding member that covers the support frame. The shielding member has a first through hole and a second through hole spaced apart. The shielding member has a first surface and a second surface arranged opposite to each other. At least a portion of the first traction member is exposed on the first surface of the shielding member. Both ends of the first traction member pass through the first through hole and the second through hole, respectively, and are exposed on the second surface of the shielding member, so as to be connected to the locking mechanism of the two folding joints, respectively.

[0041] In one aspect, this application provides a folding joint, comprising:

[0042] The locking mechanism has a locked state and an unlocked state;

[0043] A release element is used to drive the locking mechanism from the locked state to the released state;

[0044] A safety locking mechanism is used to lock or release the release element.

[0045] In some embodiments, the unlocking member includes a locking part;

[0046] The safety locking mechanism includes a locking part that cooperates with the locking part;

[0047] Specifically, when the locking part is locked to the locking part, the unlocking member is locked; and when the locking part is disengaged from the locking part, the unlocking member is unlocked.

[0048] In some embodiments, the security locking mechanism further includes an operating part for driving the locking part to engage or disengage from the locking part.

[0049] In some embodiments, the locking portion includes a groove;

[0050] The locking part is a snap-fit ​​post that mates with the groove;

[0051] Specifically, when the locking pin is engaged in the groove, the unlocking member is locked; and when the locking pin is disengaged from the groove, the unlocking member is released.

[0052] In some embodiments, the locking portion further includes a guide portion for pushing the locking portion, thereby guiding the locking portion into the groove.

[0053] In some embodiments, the guide portion has an inclined surface, and the locking portion moves along the inclined surface into the groove.

[0054] In some embodiments, the security locking mechanism includes:

[0055] A pivot shaft serves as the center of rotation when locking or unlocking the release element.

[0056] In some embodiments, the security locking mechanism includes a reset member for providing a reset force to lock the release member.

[0057] In another aspect, this application also provides a child vehicle comprising:

[0058] Frame;

[0059] The folding joint in the above embodiment is connected to the frame to allow the frame to unfold or fold.

[0060] In some embodiments, the frame includes: a front stand, a rear stand, and a rider stand;

[0061] The front leg, the rear leg, and the handframe are detachably connected to the folding joint, and the front leg and the handframe are pivotally connected through the folding joint to allow them to be unfolded or folded.

[0062] In some embodiments, the child vehicle further includes:

[0063] The first traction member is connected to the safety locking mechanism to traction the safety locking mechanism to release the release member;

[0064] A second traction member is connected to the release member to pull the release member to drive the locking mechanism from the locked state to the released state when the release member is released.

[0065] The folding joint provided in this application has a safety locking mechanism at the release part, which first drives the safety locking mechanism to release, and then releases the folding joint, thus preventing the folding joint from being accidentally released. Attached Figure Description

[0066] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0067] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0069] Figure 1 is a structural schematic diagram of the vehicle described in the first embodiment of this application;

[0070] Figure 2 is a structural schematic diagram of the rear wheel frame and folding joint shown in Figure 1 from another perspective. This locking mechanism is in the first locked state, and the safety lock body is in the first position.

[0071] Figure 3 is an enlarged view of point A in Figure 2;

[0072] Figure 4 is an exploded view from another perspective, corresponding to a magnified partial view of Figure 2.

[0073] Figure 5 is a partial cross-sectional view along line X1-X1 in Figure 2;

[0074] Figure 6 is a partial cross-sectional view of the locking mechanism in Figure 5 in the first unlocking state and the safety lock body in the second position.

[0075] Figure 7 is a structural schematic diagram of the rear wheel frame and folding joint of the vehicle described in the second embodiment of this application. The locking mechanism is in the first locking state and the safety lock body is in the first position.

[0076] Figure 8 is an exploded view of a portion of Figure 7 from another perspective;

[0077] Figure 9 is a partial sectional view along line X2-X2 in Figure 7;

[0078] Figure 10 is a partial cross-sectional view of the locking mechanism in Figure 9 in the first locked state and the safety lock body in the second position.

[0079] Figure 11 is a partial cross-sectional view of the locking mechanism in Figure 9 in the first unlocking state, with the safety lock body in the first position.

[0080] Figure 12 is an enlarged view of the safety lock body and retainer in the folding joint shown in Figure 8 from another perspective;

[0081] Figure 13 is a partial sectional view along line X3-X3 in Figure 7;

[0082] Figure 14 is a structural schematic diagram of the vehicle described in the third embodiment of this application;

[0083] Figure 15 is a partial rear-view perspective view of the vehicle shown in Figure 14;

[0084] Figure 16 is another partial rear perspective view of the vehicle shown in Figure 14;

[0085] Figure 17 is a partial frontal perspective view of the vehicle shown in Figure 14;

[0086] Figure 18 is a structural schematic diagram of the first traction component, the second traction component, and some shielding components in the vehicle shown in Figure 14.

[0087] Figure 19 schematically shows a perspective view of a child vehicle according to a fourth embodiment of the present application, wherein the folding joint is shown in a partial enlarged view;

[0088] Figure 20 schematically shows a side view of a child vehicle according to a fourth embodiment of the present application, wherein the child vehicle is in an unfolded state;

[0089] Figure 21 schematically shows a side view of a child vehicle according to a fourth embodiment of the present application, wherein the child vehicle is in a folded state;

[0090] Figure 22 schematically shows a rear view of a child vehicle according to a fourth embodiment of the present application, wherein the child vehicle is in an unfolded state and the release element is locked at part A;

[0091] Figure 23 schematically shows an enlarged view of part B in Figure 22;

[0092] Figure 24 schematically shows a side sectional view of the folding joint according to the fourth embodiment of this application;

[0093] Figure 25 schematically shows the unlocking element in Figure 23 being unlocked, wherein the locking part is disengaged from the locking part;

[0094] Figure 26 schematically shows the unlocking member in Figure 23 being unlocked, with the guide portion contacting the locking portion;

[0095] Figure 27 schematically shows an exploded view of the folding joint according to the fourth embodiment of this application from another perspective;

[0096] Figure 28 schematically shows an exploded view of the folding joint according to the fourth embodiment of this application from another perspective.

[0097] Explanation of reference numerals in the attached drawings: 101, vehicle; 102, frame; 10, driver's frame; 11, driver's body; 12, driver's pole; 20, front wheel carrier; 21, front crossbar; 22, front side bar; 23, front wheel seat; 24, front wheel; 30, rear wheel carrier; 31, rear crossbar; 32, rear side bar; 301, rear insertion slot; 302, long slot; 33, rear wheel seat; 34, rear wheel; 103. Folding joint; 100. Joint body; 110. Driver's connecting seat; 111. Driver's pivot part; 1111. First locking recess; 112. Driver's connecting part; 120. Front connecting seat; 121. Front pivot part; 1211. Second locking recess; 122. Front connecting part; 130. Rear connecting seat; 131. Rear pivot part; 132. Rear connecting part; 1321. Through hole; 1322. Push wall; 1323. First sleeve protrusion; 133. First shell part; 134. Second shell part; 135. Hollow inner cavity; 200. Locking mechanism; 210. Locking element; 211. Locking end; 212. Driven part; 213. Second sleeve protrusion; 220. Releasing element; 221. Drive end; 222. Second operating part; 223. Second locking part; 223'. Snap-fit ​​groove; 224. Guide slope; 225. First fixing part; 226. Through hole; 227. Snap-fit ​​end; 230. Rotating shaft; 240. Second reset element; 250. Pull ring; 300. Safety lock mechanism; 310. Safety lock body; 311. Sleeve portion; 3110. Hollow inner cavity; 3111. Notch; 312. First locking portion; 312'. Snap-fit ​​post; 313. Mounting lug; 314. Retaining lug; 3141. Pushing inclined surface; 315. Slide groove; 316. First operating portion; 317. Joint portion; 320. Retainer; 321. Mounting portion; 322. Abutting portion; 323. Sleeve post; 324. Retaining portion; 330. First reset component; 340. Connecting component; 341. Connecting body; 342. Connecting ring; 350. Second traction component; 351. First end; 352. Second end; 353. Lifting portion; 360. Through-ring; 370. Limiting ring; 104. First traction component: 105. Cover; 1051. First surface; 1052. Second surface; 1053. First through hole; 1054. Second through hole; 105A. Seat section; 105B. Backrest section; 105C. Leg rest section; 106. Fastener; 100X: Child vehicle; 110X: Frame; 10X: Handrail; 20X: Front kickstand; 30X: Rear kickstand; 40X: Folding joint; 60X: First towing member; 70X: Second towing member; 410X: Locking mechanism; 420X: Releasing element; 430X: Safety locking mechanism; 440X: Rotating mechanism; 411X: Drive unit; 412X: Joint locking element; 413X: Slide rail; 414X: Reset element; 415X: Snap-fit ​​part; 421X: Locking part; 422X: Transmission part; 423X: Rotating shaft; 424X: Operating part; 425X: Mounting hole;426X: Groove; 427X: Guide part X; 428X: Inclined surface; 431X: Adapter part; 432X: Rotating shaft; 433X: Locking part; 434X: Operating part; 435X: Reset part; 436X: End cap; 441X: First rear leg connector; 442X: Rider connector; 443X: Front leg connector; 444X: Second rear leg connector; 445X: Hinge; 446X: First rear leg insertion part; 447X: First connecting part; 448X : Linkage; 449X: Mounting position; 451X: First engaging part; 452X: First hinge position; 453X: Driver's insertion part; 454X: First connecting hole; 455X: Second engaging part; 456X: Second hinge position; 457X: Front foot insertion part; 458X: Second connecting hole; 459X: Second rear foot insertion part; 460X: Second connecting part; 461X: Connecting position; 462X: First hinge part; 463X: Positioning part; 464X: Second hinge part. Detailed Implementation

[0098] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described herein are merely illustrative and do not limit the scope of protection of this application.

[0099] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0100] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0101] As shown in Figure 1, the first embodiment of this application proposes a vehicle 101, which can be, for example, a children's vehicle or a pet vehicle. Although the vehicle 101 in this embodiment is described using a stroller as an example of a children's vehicle, children's vehicles can also be other types of children's vehicles such as high chairs and cribs.

[0102] Specifically, the carrier 101 includes a support frame 102 and a folding joint 103. The folding joint 103 is connected to the support frame 102 to allow the support frame 102 to be extended or folded. The support frame 102 may include at least two frames, which are pivotally connected to each other via the folding joint 103 and can be extended or folded via the folding joint 103. In this embodiment, the support frame 102 may be, for example, the frame of a stroller. The at least two frames of the stroller frame may include a handlebar frame 10, a front wheel frame 20, and a rear wheel frame 30 that are pivotally connected to each other. The handlebar frame 10, the front wheel frame 20, and the rear wheel frame 30 are pivotally connected to each other and can be extended or folded relative to each other. In this embodiment, as shown in FIG1, the handlebar frame 10 is generally a U-shaped frame, including a handlebar body 11 located at the top and handlebars 12 connected to both ends of the handlebar body 11. The front wheel frame 20 is also generally U-shaped, including a front crossbar 21 located at the lower front and two front side bars 22 connected to both ends of the front crossbar 21. A front wheel seat 23 is connected to the lower center of the front crossbar 21, and the front wheel 24 is mounted on the front wheel seat 23. The rear wheel frame 30 is generally H-shaped, including a rear crossbar 31 located at the lower rear and two rear side bars 32 connected to both ends of the rear crossbar 31. The bottom ends of the two rear side bars 32 are respectively connected to two rear wheel seats 33, and the two rear wheels 34 are respectively mounted on the two rear wheel seats 33. Of course, in other embodiments, the front wheel seat 23 and the front wheel 24 may also be provided in twos as needed. In some embodiments, the vehicle 101 may also include a seat frame suitable for carrying infants and young children (not shown in the figures). In some embodiments, the rider frame 10 may also include a handlebar (not shown in the figures), a push bar (not shown in the figures), or other control components to provide the user with ease of gripping or pushing.

[0103] It should be noted that, unless otherwise explicitly specified and limited, the directional terms such as "front," "rear," "left," "right," "up," and "down" in this embodiment correspond to the "front," "rear," "left," "right," "up," and "down" directions when the stroller is in the unfolded state. Furthermore, the "front," "rear," "left," "right," "up," and "down" directions are schematically indicated by arrows F, B, L, R, U, and D in the figure, respectively. These directional terms are only used to make the description of the embodiments of this application clearer and are not intended to unduly limit the scope of protection of this application.

[0104] Specifically, as shown in Figures 2 and 3, the folding joint 103 includes a joint body 100. The joint body 100 includes at least two connecting seats that are pivotally connected to each other. In this embodiment, the joint body 100 may include a rider connecting seat 110, a front connecting seat 120, and a rear connecting seat 130. The rider frame 10, the front wheel frame 20, and the rear wheel frame 30 may be connected to the rider connecting seat 110, the front connecting seat 120, and the rear connecting seat 130, respectively, or be integrally formed. In this embodiment, the rider frame 10, the front wheel frame 20, and the rear wheel frame 30 are plugged into the rider connecting seat 110, the front connecting seat 120, and the rear connecting seat 130, respectively. Specifically, there are two folding joints 103, which are respectively disposed on the left and right sides of the support frame 102.

[0105] The following section uses one of the folding joints 103 as an example to explain its specific structure in detail:

[0106] As shown in Figures 2 to 4, the rider connector 110 has a rider pivot portion 111 and a rider connection portion 112. In this embodiment, the rider pivot portion 111 and the rider connection portion 112 are integrally formed. In other embodiments, the rider pivot portion 111 and the rider connection portion 112 can also be independent components connected by riveting or welding. In this embodiment, the rider pivot portion 111 is generally a disc-shaped structure, and one end of the rider connection portion 112 is connected to the rider pivot portion 111 and extends along the tangential direction of the rider pivot portion 111. The corresponding rider rod 12 is provided with a rider insertion groove (not shown in the figures), and the rider connection portion 112 is inserted into the rider insertion groove to realize the connection between the rider connector 110 and the rider frame 10. Of course, in other embodiments, the rider connector 110 can also be provided with a rider insertion groove, and the corresponding rider rod 12 can be provided with a rider connection portion 112. The front connecting seat 120 has a front pivot portion 121 and a front connecting portion 122. In this embodiment, the front pivot portion 121 and the front connecting portion 122 are integrally formed structures. In other embodiments, the front pivot portion 121 and the front connecting portion 122 can also be independent components connected by riveting or welding. In this embodiment, the front pivot portion 121 is generally a disc-shaped structure, and one end of the front connecting portion 122 is connected to the front pivot portion 121 and extends along the tangential direction of the front pivot portion 121. Similarly, the corresponding front side rod 22 is provided with a front insertion groove (not shown in the figure), and the front connecting portion 122 is inserted into the front insertion groove to realize the connection between the front connecting seat 120 and the front wheel frame 20. Of course, in other embodiments, the front connecting seat 120 can also be provided with a front insertion groove, and the corresponding front crossbar 21 can be provided with a front connecting portion 122. The rear connecting seat 130 has a rear pivot portion 131 and a rear connecting portion 132. In this embodiment, the rear pivot portion 131 and the rear connecting portion 132 are integrally formed structures. In other embodiments, the rear pivot portion 131 and the rear connecting portion 132 can also be independent components connected by riveting or welding. In this embodiment, the rear pivot portion 131 is generally a disc-shaped structure, and one end of the rear connecting portion 132 is connected to the rear pivot portion 131 and extends along the radial direction of the rear pivot portion 131. Similarly, the corresponding rear rod 32 is provided with a rear insertion groove 301 (see Figure 5), and the rear connecting portion 132 is inserted into the rear insertion groove 301 to realize the connection between the rear connecting seat 130 and the rear wheel frame 30. Of course, in other embodiments, the rear connecting seat 130 can also be provided with a rear insertion groove 301, and the corresponding rear rod 32 can be provided with a rear connecting portion 132. In this embodiment, the rear connecting seat 130 includes a first shell portion 133 and a second shell portion 134. The first shell portion 133 and the second shell portion 134 are interlocked to form a hollow inner cavity 135. A portion of the first housing portion 133 and the second housing portion 134 forms the rear pivot portion 131 of the rear connector 130, and another portion of the first housing portion 133 and the second housing portion 134 forms the rear connector portion 132 of the rear connector 130.Both the driver's pivot 111 and the front pivot 121 are located in the hollow inner cavity 135 and are pivotally connected to the rear pivot 131.

[0107] Further, as shown in Figures 4 to 6, the folding joint 103 also includes a locking mechanism 200. The locking mechanism 200 has a first locked state and a first unlocked state. When the locking mechanism 200 is in the first locked state, at least two connecting seats are restricted from relative rotation; when the locking mechanism 200 is in the first unlocked state, at least two connecting seats are allowed to rotate relative to each other. In this embodiment, when the locking mechanism 200 is in the first locked state, the rider connecting seat 110, the front connecting seat 120, and the rear connecting seat 130 are restricted from relative rotation; when the locking mechanism 200 is in the first unlocked state, the rider connecting seat 110, the front connecting seat 120, and the rear connecting seat 130 are allowed to rotate relative to each other.

[0108] Specifically, as shown in Figures 4 to 6, the locking mechanism 200 may include a locking member 210. The locking member 210 is movable between a locked position and an unlocked position. When the locking member 210 is in the locked position, it is simultaneously located in at least two connecting seats, thus restricting relative rotation of the at least two connecting seats; when the locking member 210 is in the unlocked position, it disengages from at least one of the at least two connecting seats, thus allowing relative rotation of the at least two connecting seats. In this embodiment, the locking member 210 is slidably disposed in the rear connecting seat 130. Specifically, the locking member 210 is slidably disposed in the hollow cavity 135 of the rear connecting seat 130. The rider connecting seat 110 and the front connecting seat 120 (specifically, the rider pivot portion 111 and the front pivot portion 121) are respectively provided with a first locking recess 1111 and a second locking recess 1211 communicating with the hollow cavity 135. The locking member 210 has a locking end 211. When the locking mechanism 200 is in the first locked state, the locking member 210 is in the locked position, and the locking end 211 of the locking member 210 is inserted into the first locking recess 1111 and the second locking recess 1211. That is, the locking end 211 is simultaneously located in the driver's seat 110, the front connecting seat 120, and the rear connecting seat 130, thereby restricting the relative rotation of the driver's seat 110, the front connecting seat 120, and the rear connecting seat 130. When the locking mechanism 200 is in the first unlocked state, the locking member 210 is in the unlocked position, and the locking end 211 of the locking member 210 is disengaged from the first locking recess 1111 and the second locking recess 1211. That is, the locking member 210 is disengaged from the front connecting seat 120 and the rear connecting seat 130, and is only located in the driver's seat 110, thereby allowing the driver's seat 110, the front connecting seat 120, and the rear connecting seat 130 to rotate relative to each other.

[0109] In embodiments not shown, the locking member 210 may also be slidably disposed in the hollow inner cavity 135 of the front connecting seat 120, and the rider connecting seat 110 and the rear connecting seat 130 are respectively provided with a first locking recess 1111 and a second locking recess 1211 communicating with the hollow inner cavity 135. In some embodiments not shown, the locking member 210 may also be slidably disposed in the hollow inner cavity 135 of the rider connecting seat 110, and the front connecting seat 120 and the rear connecting seat 130 are respectively provided with a first locking recess 1111 and a second locking recess 1211 communicating with the hollow inner cavity 135.

[0110] Furthermore, the locking mechanism 200 may also include a release member 220, which can be operated to drive the locking mechanism 200 to switch from a first locked state to a first unlocked state. Specifically, the release member 220 is drivenly connected to the locking member 210, and the release member 220 can be operated to drive the locking member 210 to move from a locked position to an unlocked position. In this embodiment, the release member 220 is generally an elongated structure. The release member 220 and the joint body 100, specifically the rear connecting portion 132 of the rear connecting seat 130 in this embodiment, are pivotally connected via a pivot 230. The release member 220 has a driving end 221. In this embodiment, the top end of the release member 220 extends obliquely upward to form the driving end 221. The driving end 221 abuts against the locking member 210. Specifically, the locking member 210 has a driven portion 212. The driven portion 212 is a driving protrusion, specifically a fixing post provided on the locking member 210. The driving end 221 abuts against the driven part 212. Specifically, the unlocking position of the locking member 210 is located in front of the locking position in the first direction D1 (in this embodiment, the first direction D1 is the direction extending downward along the rear rod 32. Since the rear rod 32 is set at a certain angle to the vertical direction, the first direction D1 is at a certain angle to the downward direction D), and the driven part 212 is located in front of the driving end 221 in the first direction D1. More specifically, the unlocking member 220 is rotatably disposed on the outer wall of the rear connecting part 132 of the rear connecting seat 130. The rear connecting part 132 is provided with a through hole 1321 communicating with its hollow inner cavity 135. The driving end 221 extends into the hollow inner cavity 135 through the through hole 1321 to abut against the driven part 212. The unlocking member 220 has a second operating part 222, which is located on the side of the rotating shaft 230 away from the driving end 221. The second operating part 222 may be fitted with a pull ring 250, webbing, or the like for easy operation. Alternatively, the second operating part 222 may be formed into a ring-shaped structure or a protruding rod structure for easy operation. Thus, when the unlocking member 220 is operated and rotates about the pivot 230 in the second direction D2 (counterclockwise in the view of Figures 3 and 4), the driving end 221 presses against the driven part 212, causing the locking member 210 to move from the locked position to the unlocked position.

[0111] Furthermore, the locking mechanism 200 may also include a second reset member 240. The second reset member 240 is adapted to apply force to the locking member 210 to move the locking member 210 to the locked position. In this embodiment, the second reset member 240 is a spring; in other embodiments, the second reset member 240 may also be an elastic component such as a spring sheet. The second reset member 240 is located in the hollow cavity 135 of the rear connecting seat 130 (specifically the rear connecting portion 132), and the second reset member 240 is located in front of the locking member 210 in the first direction D1. The two ends of the second reset member 240 abut against the locking member 210 and the rear connecting seat 130 (specifically the rear connecting portion 132), respectively. Specifically, the hollow cavity 135 of the rear connecting seat 130 (specifically the rear connecting portion 132) has a push wall 1322, on which a first sleeve protrusion 1323 is provided, and the end of the locking member 210 away from the locking end 211 forms a second sleeve protrusion 213. One end of the second reset member 240 is fitted onto the first sleeve protrusion 1323 and abuts against the push wall 1322, while the other end of the second reset member 240 is fitted onto the second sleeve protrusion 213 and abuts against the locking member 210.

[0112] Further, as shown in Figures 2 to 4, the folding joint 103 also includes a safety lock mechanism 300. The safety lock mechanism 300 has a second locked state and a second unlocked state. When the safety lock mechanism 300 is in the second locked state, the locking mechanism 200 is in the first locked state, and the locking mechanism 200 is restricted from switching to the first unlocked state by the safety lock mechanism 300; the unlocking member 220 cannot be operated. When the safety lock mechanism 300 is in the second unlocked state, the locking mechanism 200 is allowed to switch to the first unlocked state, and the unlocking member 220 can be operated. In this embodiment, only one folding joint 103 has a safety lock mechanism 300, because the support frame 102 cannot be folded as long as one folding joint 103 is in the locked state. In other embodiments, safety lock mechanisms 300 may be provided in both folding joints 103.

[0113] Specifically, as shown in Figures 4 to 6, the safety lock mechanism 300 may include a safety lock body 310. The safety lock body 310 is movable between a first position and a second position. In this embodiment, the safety lock body 310 is slidable between the first position and the second position. In this embodiment, the second position is located in front of the first position in the first direction D1. The safety lock body 310 may include, for example, a sleeve portion 311, which is sleeved on one of at least two connecting seats or one of at least two frames. In this embodiment, the sleeve portion 311 is sleeved on the rear side rod 32 of the rear wheel frame 30 and can slide along the length direction of the rear side rod 32, so that the safety lock body 310 can switch between the first position and the second position.

[0114] Further, as shown in Figures 5 and 6, the safety lock body 310 has a first locking part 312. The unlocking part 220 has a second locking part 223. When the safety lock mechanism 300 is in the second locked state, as shown in Figure 5, the safety lock body 310 is in the first position, and the first locking part 312 and the second locking part 223 are locked together; when the safety lock mechanism 300 is in the second unlocked state, as shown in Figure 6, the safety lock body 310 is in the second position, and the first locking part 312 and the second locking part 223 are released. Specifically, please refer to Figure 4 as well; the first locking part 312 can be a snap-fit ​​post 312'. A notch 3111 is formed on the side wall of the sleeve part 311, and the notch 3111 communicates with the hollow inner cavity 3110 of the sleeve part 311. The side wall of the edge of the notch 3111 protrudes away from the hollow inner cavity 3110 to form two opposing mounting lugs 313. The locking pin 312' is inserted between the two mounting lugs 313. In other embodiments, the sleeve portion 311 may not have a notch 3111 and mounting lugs 313, and the locking pin 312' may be inserted directly into the sleeve portion 311 in a direction parallel to the radial direction of the sleeve portion 311. Specifically, the second locking part 223 is a locking groove 223' that can engage with the locking pin 312'. The release member 220 has a locking end 227 away from the drive end 221, and the locking end 227 is curled to form the locking groove 223'. As shown in FIG5, when the safety lock body 310 is in the first position, the locking pin 312' is engaged in the locking groove 223', so that the release member 220 cannot be lifted or rotated. As shown in Figure 6, when the safety lock body 310 is slid to the second position, the locking pin 312' passes over the locking end 227 and disengages from the locking groove 223', allowing the release member 220 to be operated. The release member 220 also has a guide ramp 224, which is adapted to push the locking pin 312' to guide it into the locking groove 223'. In this embodiment, the guide ramp 224 is disposed at the locking end 227 of the release member 220 and is disposed away from the locking groove 223'.

[0115] As shown in Figure 6, when the external force applied to the release member 220 is removed, the locking member 210 will move in the opposite direction of the first direction D1 under the elastic restoring force of the second reset member 240, and will move in the opposite direction of the first direction D1 by being pushed by the driven part 212 to the driving end 221, thereby causing the release member 220 to rotate in the opposite direction of the second direction D2 (clockwise in the view of Figure 6). When the release member 220 rotates to the point where the guide slope 224 abuts against the locking post 312', the guide slope 224 will continue to push against the locking post 312' to guide the locking post 312' into the locking groove 223', thereby realizing the re-engagement of the first locking part 312 and the second locking part 223.

[0116] In some embodiments, as shown in Figures 4 to 6, the safety lock body 310 further includes a first operating portion 316. The first operating portion 316 is connected to the sleeve portion 311. Specifically, the first operating portion 316 is connected to the side wall of the sleeve portion 311 and extends into the hollow inner cavity 3110 of the sleeve portion 311, forming part of the top wall of the hollow inner cavity 3110 of the sleeve portion 311. The rear rod 32 forms an elongated groove 302 extending along a first direction D1, and the first operating portion 316 is slidably disposed within the elongated groove 302. The provision of the first operating portion 316 allows the user to conveniently apply pressure along the first direction D1 to the safety lock body 310 to drive the safety lock body 310 to move from a first position to a second position. In embodiments not shown, the first operating part 316 may also be a pull rod structure or a pull ring structure protruding from the outer side wall of the sleeve part 311, or the first operating part 316 may also be an operating recess formed by a portion of the outer side wall of the sleeve part 311 recessed inward, etc. This application does not limit this.

[0117] Further, as shown in Figures 4 to 6, the safety lock mechanism 300 may also include a first reset member 330. The first reset member 330 is adapted to apply force to the safety lock body 310 to move the safety lock body 310 to a first position. In this embodiment, the first reset member 330 is a spring; in other embodiments, the second reset member 240 may also be an elastic component such as a spring sheet. Specifically, the first reset member 330 is disposed in the hollow inner cavity 3110 of the sleeve portion 311 of the safety lock body 310. The safety lock mechanism 300 may also include a retainer 320. The retainer 320 is fixed to one side of the rear rod 32. The sleeve portion 311 is sleeved outside the retainer 320, that is, the retainer 320 is located in the hollow inner cavity 3110 of the sleeve portion 311. The retainer 320 is located in front of the first operating portion 316 in the first direction D1. The retainer 320 includes a mounting portion 321 and an abutment portion 322. In this embodiment, the mounting portion 321 and the abutment portion 322 are generally arranged in a T-shape, and the mounting portion 321 and the abutment portion 322 are integrally formed. In other embodiments, the mounting portion 321 and the abutment portion 322 may also be two independent components connected by riveting or welding. A sleeve post 323 is provided on the side of the abutment portion 322 facing the first operating portion 316. One end of the first reset member 330 is sleeved on the sleeve post 323 and abuts against the abutment portion 322, while the other end of the first reset member 330 abuts against the first operating portion 316. The mounting portion 321 is mounted to the rear rod 32 by screws or other fasteners.

[0118] Further, as shown in Figures 1 and 2, the vehicle 101 also includes a first traction member 104, the two ends of which are respectively connected to the locking mechanisms 200 of the two folding joints 103. When the safety lock mechanism 300 is in the second unlocking state, the first traction member 104 can be operated to drive the two locking mechanisms 200 to switch to the first unlocking state. Optionally, the first traction member 104 is designed as a flexible component, such as webbing, rope, or other flexible material, to ensure that it is lightweight, durable, and adaptable to the needs of multi-angle stretching. The flexible design of the first traction member 104 not only facilitates operation but also reduces the overall weight of the vehicle and improves portability. In this embodiment, the first traction member 104 is a webbing. The two ends of the first traction member 104 are respectively connected to the unlocking members 220 of the two locking mechanisms 200. Specifically, the second operating part 222 of the two unlocking members 220 is provided with a through hole 226. The two pull rings 250 are respectively passed through the two through holes 226. The two ends of the first traction member 104 are connected to two pull rings 250 respectively. In this way, by pulling the first traction member 104, the two release members 220 can be rotated at the same time, thereby releasing the two locking mechanisms 200, making the operation more convenient.

[0119] The working principle of the folding joint 103 in this embodiment will be explained in detail below, taking one of the folding joints 103 as an example:

[0120] When the support frame 102 needs to be folded, as shown in Figure 5, the safety lock body 310 can be pressed along the first direction D1, causing the safety lock body 310 to move from the first position to the second position. The first locking part 312 of the safety lock body 310 disengages from the second locking part 223 of the release member 220, and the first reset member 330 is compressed and deformed. At this time, the first traction member 104 can be pulled, causing the first traction member 104 to drive the release member 220 to rotate along the second direction D2. During the rotation of the release member 220, its driving end 221 presses against the driven part 212 of the locking member 210, thereby causing the locking member 210 to move along the first direction D1, and the second reset member 240 is compressed. When the locking member 210 moves from the locked position to the released position, the locking end 211 of the locking member 210 exits from the first locking recess 1111 and the second locking recess 1211, as shown in Figure 6. Thus, when the locking mechanism 200 is released, the rider connecting seat 110, the front connecting seat 120 and the rear connecting seat 130 can rotate relative to each other, and drive the rider frame 10, the front wheel frame 20 and the rear wheel frame 30 to rotate and fold.

[0121] When it is necessary to keep the support frame 102 in the unfolded state, as shown in Figure 6, the first traction member 104 can be released, and the locking member 210 moves in the opposite direction of the first direction D1 under the elastic restoring force of the second reset member 240. When the locking member 210 moves from the unlocked position to the locked position, the locking end 211 of the locking member 210 is inserted into the first locking recess 1111 and the second locking recess 1211, thereby restricting the relative rotation of the driver's connecting seat 110, the front connecting seat 120 and the rear connecting seat 130, and the support frame 102 is kept in the unfolded state. The safety lock body 310 has also moved from the second position to the first position in the opposite direction of the first direction D1 under the elastic restoring force of the first reset member 330. During the movement of the locking member 210 in the opposite direction of the first direction D1, the driven part 212 pushes the driving end 221 of the unlocking member 220, causing the unlocking member 220 to rotate around the pivot 230 in the opposite direction of the second direction D2. When the release member 220 rotates to the point where the guide slope 224 abuts against the first locking part 312, i.e. the locking post 312', the guide slope 224 will continue to push against the locking post 312' to guide the locking post 312' into the second locking part 223, i.e. the locking groove 223', thereby realizing the re-engagement of the first locking part 312 and the second locking part 223.

[0122] As shown in Figures 7 and 8, the second embodiment of this application proposes a carrier 101, which may be, for example, a stroller. The carrier 101 also includes a support frame 102 and a folding joint 103. The structure of the carrier 101 proposed in this embodiment is basically the same as that of the carrier 101 in the first embodiment, with only some differences in the structure of the locking mechanism 200 and the safety lock mechanism 300 of the folding joint 103. These differences will be described in detail below:

[0123] Further, as shown in Figures 9 to 11, the safety lock body 310 has a retaining protrusion 314. When the safety lock body 310 is in the first position, the retainer 320 is located in front of the retaining protrusion 314 in the first direction D1, as shown in Figure 9. During the process of the safety lock body 310 moving from the first position to the second position, the retaining protrusion 314 passes over the retainer 320 and is located in front of the retainer 320 in the first direction D1, and the retaining protrusion 314 abuts against the retainer 320 to hold the safety lock body 310 in the second position, as shown in Figure 10. Thus, when it is necessary to fold the support frame 102, the user presses the safety lock body 310 to move the safety lock body 310 to the second position, and the safety lock body 310 will be held in the second position. At this time, the user can remove the hand that is pressing the safety lock body 310 and pull the first traction member 104, thereby realizing one-handed operation and making the folding process more convenient and faster.

[0124] Referring to Figures 12 and 13, a retaining protrusion 314 is formed on the inner wall of the sleeve portion 311 of the safety lock body 310. The retaining protrusion 314 has a pushing ramp 3141 to guide it across the retainer 320 and move it from one side of the retainer 320 to the other side when it abuts against the retainer 320. Specifically, there are two retaining protrusions 314, which are disposed opposite each other on the inner wall of the sleeve portion 311. A groove 315 extending along the axial direction of the sleeve portion 311 is formed between the two retaining protrusions 314. At least a portion of the abutment portion 322 is located within the groove 315 and can slide along the groove 315. The retainer 320 also includes a retaining portion 324. In this embodiment, there are two retaining portions 324. The two retaining portions 324 are located on opposite sides of the abutment portion 322 and are both connected to the mounting portion 321. The positions of the two retaining portions 324 correspond to the positions of the two retaining protrusions 314. When the safety lock body 310 is in the first position, the retaining portions 324 are located in front of the retaining protrusions 314 in the first direction D1. During the movement of the safety lock body 310 from the first position to the second position, the retaining protrusions 314 pass over the retaining portions 324 and are located in front of the retaining portions 324 in the first direction D1, and the retaining protrusions 314 abut against the retaining portions 324 to hold the safety lock body 310 in the second position. Optionally, the retaining portions 324 can be elastic fingers.

[0125] Further, as shown in Figures 7 and 11, the safety lock mechanism 300 may also include a connector 340. The connector 340 is connected between the safety lock body 310 and the release member 220. When the release member 220 is operated to drive the locking member 210 from the locked position to the released position, the release member 220 drives the safety lock body 310 from the second position to the first position via the connector 340. Specifically, the release member 220 has a first fixing portion 225. The driving end 221 and the first fixing portion 225 are located on opposite sides of the rotating shaft 230, and the first fixing portion 225 is located at the end of the second operating portion 222 away from the second locking portion 223. The connector 340 is connected to the first fixing portion 225 of the release member 220 and to the first locking portion 312 of the safety lock body 310. More specifically, the connector 340 may include an elongated connecting body 341 and two connecting rings 342. Two connecting rings 342 are respectively connected to both ends of the connecting body 341. One connecting ring 342 is connected to the first fixing part 225, and the other connecting ring 342 is sleeved on the first locking part 312. In some embodiments, the other connecting ring 342 may also be connected to other parts of the safety lock body 310. Thus, when the release member 220 is pulled to rotate about the pivot 230 in the second direction D2, the release member 220 also pulls the safety lock body 310 from the second position to the first position through the connecting member 340, thereby facilitating the automatic re-engagement of the second locking part 223 of the release member 220 with the first locking part 312 of the safety lock body 310 when the support frame 102 is subsequently deployed. Optionally, the connecting body 341 can be a steel cable.

[0126] The working principle of the folding joint 103 in this embodiment will be explained in detail below, taking one of the folding joints 103 as an example:

[0127] When the support frame 102 needs to be folded, as shown in Figure 9, the safety lock body 310 can be pressed along the first direction D1, causing the safety lock body 310 to move from the first position to the second position. The first locking part 312 of the safety lock body 310 disengages from the second locking part 223 of the release member 220, and the first reset member 330 is compressed and deformed. At the same time, the retaining protrusion 314 passes over the retaining part 324 and is located in front of the retaining part 324 in the first direction D1, thereby holding the safety lock body 310 in the second position, as shown in Figure 10. At this time, the hand pressing the safety lock body 310 can be released, and the first traction member 104 can be pulled, causing the first traction member 104 to drive the release member 220 to rotate along the second direction D2. During the rotation of the release member 220, its driving end 221 presses against the driven part 212 of the locking member 210, thereby causing the locking member 210 to move along the first direction D1, and the second reset member 240 is compressed. When the locking member 210 moves from the locked position to the unlocked position, the locking end 211 of the locking member 210 disengages from the first locking recess 1111 and the second locking recess 1211, as shown in Figure 11. Thus, the locking mechanism 200 is unlocked, and the rider connection seat 110, front connection seat 120, and rear connection seat 130 can rotate relative to each other, causing the rider frame 10, front wheel frame 20, and rear wheel frame 30 to rotate and fold. Simultaneously, as the unlocking member 220 rotates along the second direction D2, it pulls the safety lock body 310 from the second position to the first position via the connecting member 340.

[0128] The process by which the folding joint 103 keeps the support frame 102 in the unfolded state is basically similar to that in the previous embodiment. The only difference is that when the connecting member 340 is pulled, the safety lock body 310 has already moved to the first position under the pulling action of the connecting member 340, instead of moving to the first position in the opposite direction of the first direction D1 under the elastic restoring force of the first reset member 330. This will not be described in detail here.

[0129] As shown in Figure 14, the third embodiment of this application proposes a carrier 101, which may be, for example, a stroller. The carrier 101 also includes a support frame 102 and a folding joint 103. The structure of the carrier 101 proposed in this embodiment is basically the same as that of the carrier 101 in the first embodiment, with only some differences in the unlocking mechanism of the safety lock mechanism 300 of the folding joint 103. These differences will be described in detail below:

[0130] As shown in Figures 15 and 16, the safety lock mechanism 300 may further include a second traction member 350. The second traction member 350 has a first end 351 and a second end 352 (see Figure 17). The first end 351 is connected to the safety lock mechanism 300, and the second end 352 is adapted to be operated to switch the safety lock mechanism 300 from a second locked state to a second unlocked state. Specifically, the first end 351 may be connected to the safety lock body 310, and the second end 352 is adapted to be operated to move the safety lock body 310 from a first position to a second position. In this embodiment, the safety lock body 310 may or may not have a first operating part 316. When the safety lock body 310 has a first operating part 316, the user can unlock the safety lock mechanism 300 by pressing the first operating part 316 or by pulling the second end 352 of the second traction member 350. When the safety lock body 310 does not have the first operating part 316, the user can only release the safety lock mechanism 300 by pulling the second end 352 of the second traction member 350. Optionally, the second traction member 350 is designed as a flexible component, such as webbing, rope, or other flexible material, to ensure that it is lightweight, durable, and adaptable to multi-angle stretching requirements. The flexible design of the second traction member 350 not only facilitates operation but also reduces the overall weight of the vehicle, improving portability. In this embodiment, the second traction member 350 is a webbing.

[0131] Specifically, as shown in FIG16, the safety lock mechanism 300 further includes a through-ring 360. The through-ring 360 is located in front of the safety lock body 310 in the first direction D1. In this embodiment, as shown in FIG16, the through-ring 360 is fixed to the rear rod 32 and is below the safety lock body 310. At least a portion of the second traction member 350 passes through the through-ring 360, and the first end 351 and the second end 352 of the second traction member 350 are located on the same side of the through-ring 360, for example, the first end 351 and the second end 352 of the second traction member 350 are both located above the through-ring 360 in FIG16. Specifically, pulling the second end 352 of the second traction member 350 in a direction away from the through-ring 360 can cause the second traction member 350 to drive the safety lock body 310 to move in the opposite direction of the first direction D1. Optionally, the through-ring 360 can be, for example, a metal ring, a plastic ring, a fabric ring, or a ring structure of other materials. In this embodiment, the threading ring 360 is a fabric ring. Specifically, the threading ring 360 can be fixed to the rear rod 32, for example, by fasteners 106 such as screws. The first end 351 and the second end 352 of the second traction member 350 are both located above the safety lock body 310 in the direction shown in FIG. 16. The first end 351 of the second traction member 350 first passes downward into the fabric ring, and then bends upward through the fabric ring to connect with the safety lock body 310. This arrangement allows the safety lock body 310 to move downward along the first direction D1 when the second end 352 is pulled away from the fabric ring, that is, upward. In other words, the direction in which the second traction member 350 is pulled is opposite to the direction in which the safety lock body 310 moves.

[0132] Specifically, as shown in Figure 16, the safety lock body 310 is provided with a connecting portion 317, and the first end 351 of the second traction member 350 is connected to the connecting portion 317. In this embodiment, the connecting portion 317 is, for example, a connecting hole provided on the sleeve portion 311 of the safety lock body 310, and the first end 351 of the second traction member 350 passes through the connecting hole to connect with the sleeve portion 311. In other embodiments, the connecting portion 317 can also be a connecting ring or other structure protruding from the sleeve portion 311. In short, as long as the connection between the first end 351 of the second traction member 350 and the safety lock body 310 can be achieved, it is acceptable.

[0133] As shown in Figure 18, the portion of the second traction member 350 near the second end 352 forms a lifting portion 353 for easy lifting. The lifting portion 353 can be formed, for example, by folding and sewing the portion of the second traction member 350 near the second end 352 toward the first end 351. In embodiments not shown, the lifting portion 353 can also be formed by connecting the second end 352 to a rigid annular structure (such as a metal ring). In short, it can be formed as long as it facilitates lifting by the user.

[0134] Further, as shown in Figures 17 and 18, the vehicle 101 may also include a shield 105, which covers the support frame 102. In this embodiment, the shield 105 may be a seat cover covering the support frame 102. In other embodiments not shown, the shield 105 may also be a leather cover or a soft plastic cover covering the support frame 102, etc., and this application does not limit this. The shield 105 has a first surface 1051 and a second surface 1052 disposed opposite to each other. The first surface 1051 is the surface of the shield 105 facing the passenger sitting in the vehicle 101, and the second surface 1052 is the surface of the shield 105 facing away from the passenger sitting in the vehicle 101. At the same time, the first surface 1051 is the surface facing away from the through-ring 360, and the second surface 1052 is the surface facing the through-ring 360. The shield 105 has a first through-hole 1053 extending through the first surface 1051 and the second surface 1052. At least a second end 352 of the second traction member 350 is exposed outside the first surface 1051 through the first through-hole 1053 for operation. Specifically, at least a lifting portion 353 of the second traction member 350 is exposed outside the first surface 1051 through the first through-hole 1053 for operation. More specifically, as shown in FIG17, the shield 105 also includes a seat portion 105A covering the seat frame of the vehicle 101. The aforementioned first through-hole 1053 is provided in the seat portion 105A. At least a lifting portion 353 of the second traction member 350 is exposed above the upper surface of the seat portion 105A through the first through-hole 1053. The upper surface of the seat portion 105A is for facing a passenger sitting in the vehicle 101, and the first surface 1051 includes the upper surface of the seat 105A. As can be understood, please refer to Figure 16 as well. The rear side bar 32 and the safety lock body 310 are both located below the seat portion 105A. The first end 351 of the second traction member 350 passes through the first through hole 1053 through the lower surface of the seat portion 105A, that is, it is located below the second surface 1052 and connected to the safety lock body 310. The lower surface of the seat portion 105A is disposed opposite to the upper surface of the seat portion 105A, and the lower surface of the seat portion 105A is disposed away from the passenger sitting in the vehicle 101. The second surface 1052 includes the lower surface of the seat 105A.

[0135] Furthermore, as shown in FIG17, the size of the lifting part 353 in at least one direction is larger than the diameter of the first through hole 1053 in the corresponding direction, so that the lifting part 353 will not slide through the first through hole 1053 to the side of the seat part 105A with the second surface 1052, that is, the lifting part 353 can be limited to the side of the seat part 105A with the first surface 1051 for user operation.

[0136] Further, as shown in Figure 14, the support frame 102 may also include a backrest frame (not shown in the figure), which is disposed between the two handlebars 12. The cover 105 may also include a backrest portion 105B covering the backrest frame. The backrest portion 105B is disposed above the seat portion 105A. The cover 105 may also include a leg rest portion 105C covering the front wheel frame 20. The leg rest portion 105C is disposed below the seat portion 105A. In this embodiment, the cover 105 is a one-piece molded structure, with the backrest portion 105B, seat portion 105A, and leg rest portion 105C arranged sequentially. In other embodiments, the cover 105 may also be formed by sequentially connecting components such as the backrest portion 105B, seat portion 105A, and leg rest portion 105C through sewing or other methods.

[0137] As shown in Figures 16 to 18, the two ends of the first traction member 104 are respectively connected to the locking mechanisms 200 of the two folding joints 103, and at least a portion of the first traction member 104 is exposed outside the first surface 1051 of the cover member 105. Specifically, at least a portion of the first traction member 104 is exposed on the upper surface of the seat portion 105A of the cover member 105. More specifically, the upper surface of the seat portion 105A is provided with a second through hole 1054. The second through hole 1054 is spaced apart from the first through hole 1053. Approximately the middle portion of the first traction member 104 is exposed on the upper surface of the seat portion 105A. It can be understood that the locking mechanisms 200 of the two folding joints 103 are both located below the seat portion 105A. The two ends of the first traction member 104 pass through the first through hole 1053 and the second through hole 1054 respectively through the lower surface of the seat portion 105A, that is, below the second surface 1052 and are respectively connected to the locking mechanisms 200 of the two folding joints 103. Thus, when the support frame 102 needs to be folded, the lifting part 353 of the second traction member 350 can be pulled first to release the safety lock mechanism 300, and then the part of the first traction member 104 exposed on the upper surface (or the first surface 1051) of the seat part 105A can be pulled to release the locking mechanism 200, and the support frame 102 can be folded, thus realizing one-handed operation to release the support frame 102.

[0138] Further, as shown in Figure 18, the carrier 101 may also include a limiting ring 370. The limiting ring 370 is connected to the first traction member 104, and at least a portion of the second traction member 350 passes through the limiting ring 370 and is movable relative to the limiting ring 370. The first end 351 and the second end 352 of the second traction member 350 are respectively located on both sides of the limiting ring 370. Optionally, the limiting ring 370 may be, for example, a metal ring, a plastic ring, a fabric ring, or an annular structure of other materials. In this embodiment, the limiting ring 370 is a fabric ring. Specifically, the limiting ring 370 is sewn to the first traction member 104.

[0139] Furthermore, the direction of the lifting force experienced by the second traction member 350 when it is pulled is opposite to the direction of the limiting force exerted by the limiting ring 370 on the second traction member 350. In this embodiment, the second end 352 of the second traction member 350 can be pulled upward, that is, the direction of the lifting force experienced by the second traction member 350 when it is pulled is upward, and the direction of the limiting force exerted by the limiting ring 370 on the second traction member 350 is downward. Specifically, at least a portion of the first traction member 104 passes through the limiting ring 370 and is connected to the bottom of the limiting ring 370. At least a portion of the second traction member 350 passes through the limiting ring 370 and is located above the first traction member 104. In this embodiment, the limiting ring 370 is a fabric ring with a certain axial length. The axial direction of the limiting ring 370 is approximately the same as the extension direction of the portion of the second traction member 350 located within the limiting ring 370. Thus, when the second end 352 of the second traction member 350 is pulled upward, the top of the limiting ring 370 exerts a downward limiting force on the second traction member 350 that passes through the limiting ring 370, thereby having a certain limiting effect on the second traction member 350.

[0140] Of course, in other embodiments, the first traction member 104 may not pass through the limiting ring 370. For example, at least part of the first traction member 104 may be located below the limiting ring 370 and connected to the limiting ring 370.

[0141] Further, as shown in Figure 18, the limiting ring 370 is exposed on the second surface 1052 of the shielding member 105, that is, the limiting ring 370 is exposed on the lower surface of the seat portion 105A. When the lifting portion 353 of the second traction member 350 is pulled upward, the friction between the second traction member 350 and the edge of the first through hole 1053 will cause the second traction member 350 to slide along with part of the seat portion 105A, which can easily cause wrinkles in the seat portion 105A and make the pulling process of the second traction member 350 less smooth. In this embodiment, since the second traction member 350 passes through the limiting ring 370, the upper surface of the limiting ring 370 has a downward constraint force on the second traction member 350, so that when the second traction member 350 is pulled, it will not cause the seat portion 105A to slide and wrinkle, thus making the pulling process of the second traction member 350 smoother.

[0142] Of course, the arrangement and position of the first traction member 104 and the second traction member 350 in this embodiment can also be applied to the vehicle 101 proposed in the first embodiment and the second embodiment.

[0143] The folding joint 103 and the carrier 101 proposed in this application have at least the following beneficial effects:

[0144] In the aforementioned folding joint 103, the joint body 100 includes at least two connecting seats pivotally connected to each other. The locking mechanism 200 is switchable between a first locked state and a first unlocked state to restrict or allow relative rotation of at least two connecting seats. The safety lock mechanism 300 is switchable between a second locked state and a second unlocked state to restrict or allow the locking mechanism 200 to switch to the first unlocked state. That is, the unlocking member 220 can only be operated to release the locking mechanism 200 when the safety lock mechanism 300 is unlocked. This prevents accidental folding of the folding joint 103 or the vehicle 101 when the locking mechanism 200 is accidentally activated, thereby improving the safety performance of the vehicle 101.

[0145] Referring to Figures 19 to 21, the fourth embodiment of this application proposes a child carrier 100X, which may be, for example, a stroller. Although the child carrier 100X in this embodiment is described using a stroller as an example, the child carrier 100X may also be other types of carriers such as a baby playpen or a baby hammock.

[0146] In some embodiments, as shown in the perspective view of FIG19 and the side views of FIG20 and 21, the child vehicle 100X includes a frame 110X and a folding joint 40X. The frame 110X is the main structure of the entire vehicle, serving a supporting and load-bearing function. The frame 110X includes a front stand 20X, a rear stand 30X, and a handrail 10X. The folding joint 40X is the core component that enables the vehicle to fold. The folding joint 40X is connected to the frame 110X, and at least one of the front stand 20X, rear stand 30X, and handrail 10X of the frame 110X is pivotally connected to other parts via the folding joint 40X. This pivotal connection can be understood as a rotary or hinged mechanical connection, allowing the frame 110X to switch between two different states: an unfolded state and a folded state. In the unfolded state, the frame 110X is fully extended and locked, and the vehicle can be used normally, providing a stable seat or support structure for children; as shown in Figure 21, in the folded state, the frame 110X is folded up by the rotation function of the folding joint 40X, making the vehicle occupy less space and easier to store or carry.

[0147] In some embodiments, as shown in Figures 20 and 21, the front stand 20X, rear stand 30X, and handframe 10X together constitute the basic frame of the vehicle, supporting the overall function and weight distribution of the vehicle. The front stand 20X is located at the front of the frame 110X and typically provides frontal support for the vehicle in its deployed state. Its main functions include providing forward stability and serving as a connection point for the front wheels or frontal support components. The front stand 20X is pivotally connected to the handframe 10X and rear stand 30X via a folding joint 40X, allowing it to converge towards the rear stand 30X in the folded state, thereby reducing the overall size of the vehicle. The rear stand 30X is located at the rear of the frame 110X and primarily provides rear-end support, typically connecting to the rear wheels or bottom support structure of the vehicle. Similar to the front stand 20X, the rear stand 30X is also pivotally connected via the folding joint 40X, that is, it is pivotally connected to the frame 10X and the front stand 20X via the folding joint 40X. When extended, the rear stand 30X is locked in a proper relative position with the frame 10X and the front stand 20X to ensure stability; when folded, the rear stand 30X is folded together by rotation or folding, forming a compact structure with the front stand 20X. The frame 10X is located on the upper part of the frame 110X. In some embodiments, the frame 10X may include a handle, push bar, or other control components to provide the user with ease of gripping or pushing. The frame 10X is pivotally connected via the folding joint 40X, that is, the folding joint 40X is pivotally connected to the front stand 20X and the rear stand 30X. When folded, the frame 10X is folded together with the front stand 20X and the rear stand 30X by rotation or folding. The front stand 20X, rear stand 30X, and handframe 10X are detachably connected to the folding joint 40X, which has a rotating mechanism 440X. The rotating mechanism 440X of the folding joint 40X enables the frame to be unfolded and folded, while ensuring operational flexibility and structural reliability.

[0148] In some embodiments, as shown in Figures 19 and 20, the child vehicle 100X further includes a first traction member 60X and a second traction member 70X. The first traction member 60X and the second traction member 70X apply traction force, driving the folding joint 40X to release, allowing the front legs 20X, rear legs 30X, and handframe 10X to come together, thereby folding the frame 110X. In its structural design, the child vehicle 100X, in addition to the basic frame and folding joint, additionally includes the first traction member 60X and the second traction member 70X, which play a driving role in realizing the folding function of the vehicle. The first traction member 60X and the second traction member 70X are components specifically designed to apply traction force. In some embodiments, these traction members are designed as flexible components, such as webbing, rope, or other flexible materials, to ensure they are lightweight, durable, and adaptable to multi-angle stretching requirements. The flexible design of the traction members not only facilitates operation but also reduces the overall weight of the vehicle, improving portability.

[0149] In some embodiments, the primary function of the first traction member 60X and the second traction member 70X is to drive the folding joint to complete the unlocking operation by applying traction force, thereby realizing the folding of the vehicle. When the user applies a pulling force to the traction member, this force is transmitted to the folding joint 40X, causing the locking device of the joint to be unlocked. After the lock is released, the relative positional relationship between the front leg 20X, the rear leg 30X, and the handframe 10X is changed, allowing them to move closer together and complete the overall folding action. Using flexible traction members instead of complex mechanical lever devices, the user can simply pull to complete the unlocking and folding. The flexible material of the traction member can buffer external forces over a large range, reducing the risk of accidental pinching due to misoperation. Flexible materials such as webbing are lightweight and small in size, and will not significantly increase the overall weight of the vehicle, while also being well hidden or stored after folding, improving the overall aesthetics. The first traction member 60X and the second traction member 70X are not only functional accessories in the child vehicle 100X, but also embody the concept of human-centered design. By applying traction to the folding joints 40X, they effectively simplify the conversion process of the vehicle from unfolding to folding, while maintaining structural stability and safety of use, further enhancing the portability and practicality of the vehicle.

[0150] Referring to Figures 22 and 23, Figure 22 schematically shows a rear view of a child vehicle according to an embodiment of the present application, wherein the child vehicle is in an unfolded state; Figure 23 schematically shows an enlarged view of part A in Figure 22. In some embodiments, the folding joint 40X has a locking device, which includes a locking mechanism 410X, a release element 420X, and a safety locking mechanism 430X.

[0151] The locking mechanism 410X has a locked state and an unlocked state. The locking mechanism 410X is the main device for locking or unlocking the rotating mechanism 440X of the folding joint 40X. When the locking mechanism 410X is in the locked state, the rotating mechanism 440X is locked, and the various parts of the frame 110X, such as the front leg 20X, rear leg 30X, and handrail 10X, are fixed in the unfolded position, ensuring the vehicle remains stable during use and does not fold accidentally. When the locking mechanism 410X is driven to the unlocked state, the rotating mechanism 440X of the folding joint 40X is allowed to move, thereby enabling the folding or unfolding operation of the frame 110X.

[0152] The release element 420X is used to drive the locking mechanism 410X from the locked state to the unlocked state. The release element 420X can be designed as a manually or mechanically operated component. Referring again to Figure 19, the release element 420X can cooperate with a traction element, such as a second traction element 70X, to provide an intuitive operating experience. In some embodiments, the release element 420X can be designed as a press-type or sliding type for convenient one-handed operation. In actual use, the release element 420X is subjected to a force applied by the operator, which is transmitted to the locking mechanism 410X to complete the unlocking operation.

[0153] In some embodiments, the safety locking mechanism 430X is used to lock or unlock the release member 420X. Therefore, the safety locking mechanism 430X prevents the locking mechanism 410X from being released due to accidental operation. When the safety locking mechanism 430X is locked to the release member 420X, the release member 420X is fixed, and the user's operation of the release member 420X will prevent the locking mechanism 410X from changing from a locked state to an unlocked state. This function effectively prevents accidental release due to accidental contact, vibration, or external force, thereby protecting the stability of the vehicle. When the safety locking mechanism 430X disengages from the release member 420X, the release member 420X is released.

[0154] In some embodiments, the safety locking mechanism 430X can be designed as a rotary safety lock: locking and unlocking of the release element 420X is achieved by rotating a switch or latch. In some embodiments, the safety locking mechanism 430X can be designed as a slider safety lock: locking and unlocking of the release element 420X is achieved by sliding a switch or latch. In some embodiments, the safety locking mechanism 430X can be designed as a knob safety lock: adjusting the release element 420X to the locked or unlocked position is achieved by rotating a knob. In some embodiments, the safety locking mechanism 430X can be designed as a push-button safety lock: releasing the lock on the release element 420X is achieved by pressing a safety button.

[0155] In some embodiments of this application, a safety locking mechanism 430X is provided at the release member 420X. The user first operates the safety locking mechanism 430X to release the lock on the release member 420X, and then operates the release member 420X to release the folding joint 40X, thus preventing accidental release of the folding joint 40X. This structural design makes the operation more intuitive and reduces the possibility of misoperation.

[0156] Referring to Figure 23, the release member 420X of the folding joint 40X is locked. In some embodiments, the locking mechanism 410X includes a drive unit 411X, a joint locking member 412X, a slide rail 413X, and a reset member 414X. The release member 420X is driveably connected to the joint locking member 412X via the drive unit 411X. The drive unit 411X is a transmission component connecting the release member 420X and the joint locking member 412X, responsible for transmitting external force, such as pressing or pulling the release member 420X, to the joint locking member 412X.

[0157] Referring also to Figure 24, which schematically shows a side sectional view of the folding joint according to an embodiment of this application. One end of the joint locking member 412X can lock or unlock the rotation mechanism 440X of the folding joint 40X, and the other end is connected to the reset member 414X. The joint locking member 412X is the actuating component of the locking mechanism 410X, and one end of it can interact with the rotation mechanism 440X of the folding joint 40X to fix the rotation mechanism 440X by snapping or engaging. In the locked state, one end of the joint locking member 412X is snapped with the rotation mechanism 440X, restricting the rotation of the rotation mechanism 440X. The release member 420X applies a driving force to the drive unit 411X, causing the joint locking member 412X to move from the locked position to the unlocked position along the slide rail 413X. This drives the locking mechanism 410X from the locked state to the unlocked state, releasing the degree of freedom of movement of the rotating mechanism 440X and unlocking the rotating mechanism 440X of the folding joint 40X. When it is necessary to lock the folding joint 40X, the restoring force of the reset member 414X can move the joint locking member 412X from the unlocked position to the locked position, driving the locking mechanism 410X from the unlocked state to the locked state and locking the rotating mechanism 440X of the folding joint 40X.

[0158] In some embodiments, the drive unit 411X may be a drive pin, i.e., a small mechanical component capable of transmitting driving force along a specific path. In some embodiments, the drive unit 411X is designed in the form of a drive pin to transmit operating force quickly and directly, ensuring the efficiency of the locking or unlocking process. In some embodiments, the design of the drive unit 411X needs to ensure that it is robust enough to withstand the stress from repeated operation, while having low friction characteristics to ensure smooth operation.

[0159] In some embodiments, the slide 413X serves as a trajectory guide for the movement of the joint locking member 412X, and its design directly affects the smoothness and precision of locking and unlocking operations. The slide 413X can be curved or straight, matching the movement path of the joint locking member 412X. In some embodiments, the slide 413X possesses wear resistance and a low coefficient of friction to reduce mechanical wear during operation. In some embodiments, the slide 413X provides a precise movement trajectory, guiding the movement of the joint locking member 412X and preventing deviation or jamming.

[0160] Please refer to Figure 24. The reset element 414X is used to automatically reset the joint locking element 412X to the locked position after the external force is released. In some embodiments, the reset element 414X can be a coil spring, thus giving it strong elastic recovery capability, small size, and easy installation. The reset element 414X ensures that the joint locking element 412X can quickly return to its original position after the operation is completed, without additional manual intervention, improving operational convenience.

[0161] As shown in Figures 23 and 25, the release member 420X is movably disposed on the frame 110X (e.g., the rear footrest 30X) and has an operable state and a locked state. In some embodiments, the release member 420X includes a locking part 421X, a transmission part 422X, a rotating shaft 423X, and an operating part 424X.

[0162] The pivot 423X is a connecting component between the release element 420X and the frame 110X (e.g., the rear stand 30X), allowing the release element 420X to rotate around it. In some embodiments, the release element 420X is rotatably connected to the rear stand 30X via the pivot 423X, providing a rotation axis that allows the release element 420X to rotate flexibly to complete the release operation, ensuring stability and low friction during rotation and preventing jamming or misalignment during operation. The pivot 423X may be designed as a cylinder and lubricated to reduce wear. The diameter and material of the pivot can be matched to the size and load of the release element as needed.

[0163] The locking part 421X interacts directly with the safety locking mechanism 430X. When the safety locking mechanism 430X limits the locking part 421X, for example, by restricting its displacement in the circumferential direction of the release member 420X, the release member 420X cannot rotate and is locked, thus preventing it from releasing the locking mechanism 410X. When the safety locking mechanism 430X releases its limit on the locking part 421X, the release member 420X returns to its operable state, can rotate, and transmits operating force, thereby enabling it to release the locking mechanism 410X. In some embodiments, the locking part 421X is made of a material with high strength and wear resistance, such as metal or engineering plastic.

[0164] The transmission unit 422X is directly connected to the drive unit 411X, thereby driving the joint locking member 412X to move as the release member 420X rotates around the pivot 422. In some embodiments, when the release member 420X rotates around the pivot 423X, the transmission unit 422X can also drive the joint locking member 412X to move through a transmission mechanism such as a lever or gear. The transmission unit 422X can adopt a straight rod, a curved arm, or a gear structure, and the specific form can be adjusted according to the design requirements of the locking mechanism 410X.

[0165] The operating unit 424X can be connected to the second traction member 70X. For example, the operating unit 424X can have a pull ring or handle, and the second traction member 70X is connected to the pull ring or handle. The user can pull the second traction member 70X, thereby causing the release member 420X to rotate in the first direction D1, as shown in Figures 25 and 26. Through the operating unit 424X and the second traction member 70X, the user can complete the release operation of the release member 420X with a simple pulling action, which is suitable for various usage scenarios.

[0166] In some embodiments, along the length of the frame 110X (e.g., rear leg support 30X), the pivot 423X of the release member 420X is located between the transmission portion 422X and the operating portion 424X. In some embodiments, along the length of the frame 110X (e.g., rear leg support 30X), the pivot 423X of the release member 420X is located between the transmission portion 422X and the locking portion 421X. In some embodiments, the transmission portion 422X and the pivot 423X are located at one end of the release member 420X, and the operating portion 424X and the locking portion 421X are located at the other end of the release member 420X.

[0167] In some embodiments, a safety locking mechanism 430X is movably mounted on the frame 110X (e.g., rear footrest 30X), and the safety locking mechanism 430X is used to prevent the release member 420X from releasing. The safety locking mechanism 430X includes a locking part 433X that cooperates with the locking part 421X. When the locking part 433X is locked with the locking part 421X, the release member 420X is locked and cannot be rotated or driven; and when the locking part 433X disengages from the locking part 421X, the release member 420X is released and is in an operable state, allowing the user to perform the release operation via the operating part 424X. In some embodiments, to enhance the stability of the lock, the locking part 433X may be made of high-strength metal or wear-resistant plastic.

[0168] In some embodiments, as shown in Figures 23 to 26, the safety locking mechanism 430X further includes an operating part 434X. The operating part 434X controls the movement of the locking part 433X by transmitting the operating force applied by the user. The operating part 434X may also have a pull ring or handle for connection with the first traction member 60X. The user can apply a pulling force through the first traction member 60X, indirectly acting on the operating part 434X to operate the safety locking mechanism 430X, disengaging the locking part 433X from the locking part 421X. In some embodiments, along the length of the frame 110X (e.g., the rear footrest 30X), the operating part 434X is located at one end of the safety locking mechanism 430X, and the locking part 433X is located at the other end of the safety locking mechanism 430X.

[0169] In some embodiments, the locking portion 421X of the release member 420X provides a fixing structure that mates with the locking portion 433X, and may include one or more grooves 426X. The grooves 426X provide insertion space for the locking portion 433X. When the locking portion 433X is fully embedded in the groove 426X, the release member 420X is prohibited from releasing (e.g., rotation). When the locking portion 433X disengages from the groove 426X, the release member 420X is in an operable state. In some embodiments, the locking portion 433X may be a snap-fit ​​post that mates with the groove 426X. The snap-fit ​​post may be cylindrical or wedge-shaped, and its shape may match the groove 426X to achieve a secure lock. In some embodiments, to enhance snap-fit ​​stability, the surface of the snap-fit ​​post may be textured with anti-slip patterns or made of a wear-resistant material. Guide grooves or chamfers may be designed on the sides of the snap-fit ​​post to ensure smooth insertion and disengagement from the groove 426X. The depth, width, and shape of the groove 426X match the snap-fit ​​post. To prevent accidental detachment, the groove can be designed with locking mechanisms or flexible fasteners. For enhanced durability, the groove is typically made of high-strength materials such as stainless steel or engineering plastics.

[0170] In some embodiments, referring to Figure 28, the safety locking mechanism 430X further includes a transition portion 431X and a rotating shaft 432X. In some embodiments, the rotating shaft 432X is parallel to the rotating shaft 423X. The transition portion 431X is an intermediary component connecting the rotating shaft 432X to other components, ensuring that the safety locking mechanism 430X can rotate smoothly around the rotating shaft 432X. The transition portion 431X connects the safety locking mechanism 430X to the rotating shaft 432X, realizing the overall rotatability of the mechanism. When an external force is applied by the operating portion 434X, the transition portion 431X transmits torque, causing the safety locking mechanism 430X to rotate around the rotating shaft 432X. The transition portion 431X can be made of a high-strength material, such as steel or aluminum alloy, to withstand repeated operating forces. Both ends of the transition portion 431X are connected to the rotating shaft 432X, while maintaining coordinated movement with the locking portion 433X, ensuring consistent operation of the entire mechanism. The adapter 431X can be designed as a recess or a through hole, its shape fitting snugly to both ends of the shaft 432X. The recess accommodates both ends of the shaft 432X, achieving a secure connection through the snug fit, providing stable support and guidance, allowing the adapter 431X to rotate around the shaft. The shape of the recess matches the cross-section of the shaft 432X and can be circular, square, or elliptical. The depth of the recess is slightly greater than the insertion length of the shaft 432X to ensure sufficient locking strength after installation. The through hole provides a through-hole structure for the shaft 432X, allowing it to be inserted from one end and exit from the other. The through hole facilitates assembly and can be further secured with the shaft end cap 436X, pin, or screw. The shape of the through hole matches the cross-section of the shaft 432X, and its dimensions are slightly smaller than or equal to the tolerance range of the shaft 432X to form a snug fit. A stop can be designed inside the through hole to prevent the shaft 432X from being inserted too deeply or from axial movement. End cap 436X is used to secure the rotating shaft 432X, preventing axial movement or detachment of the rotating shaft 432X within the adapter 431X. The end cap 436X is designed to provide mechanical protection for the rotating shaft 432X, preventing wear, corrosion, or other damage caused by rotation. In some embodiments, the end cap 436X may also enhance the stability of the rotating shaft through a locking or threaded structure. The end cap 436X can be designed in a circular, square, or other shape to fit tightly to both ends of the rotating shaft, and its internal design is adapted to the diameter of the rotating shaft, ensuring a tight and secure fit.

[0171] The pivot 432X is the component that enables the rotational movement of the safety locking mechanism 430X. It connects the adapter 431X to the rear support 30X of the frame 110X, providing a pivot point so that the safety locking mechanism 430X can rotate around a fixed axis. When an external force is applied by the operating part 434X, the pivot 432X bears torque and transmits it to the adapter 431X. To reduce rotational friction, the pivot 432X may employ a surface lubricating coating (such as PTFE) or be equipped with ball bearings.

[0172] In some embodiments, the safety locking mechanism 430X includes a reset member 435X. The reset member 435X is configured to bias the locking portion 433X toward the locking position. The reset member 435X can be an elastic element, such as a coil spring or a torsion spring. One end of the reset member 435X is connected to the safety locking mechanism 430X, and the other end is connected to the frame 110X (e.g., the rear footrest 30X). When the user applies force through the operating part 434X, causing the safety locking mechanism 430X to rotate in the second direction D2, as shown in Figures 25 and 26, the locking portion 433X rotates in the second direction D2, thereby disengaging from the locking portion 421X. In some embodiments, when the safety locking mechanism 430X rotates in the second direction D2, the reset member 435X deforms. The reset member 435X can provide a restoring force to the safety locking mechanism 430X, so that when the locking part 433X of the safety locking mechanism 430X and the locking part 421X of the release member 420X are locked again, the two remain locked together. In some embodiments, the second direction D2 is the same as the first direction D1.

[0173] In some embodiments, as shown in FIG25, after the locking part 433X disengages from the locking part 421X, when the user stops applying external force, the reset member 435X restores the safety locking mechanism 430X to the ready-to-operate state, facilitating re-locking. In some embodiments, as shown in FIG26, when the safety locking mechanism 430X is restored to the ready-to-operate state, the locking part 433X contacts the inclined surface 428X of the guide part 427X.

[0174] In some embodiments, as shown in Figures 23 to 26, the locking part 421X further includes a guide part 427X, which contacts the locking part 433X and pushes the locking part 433X, thereby guiding the locking part 433X into the groove 426X. The guide part 427X has an inclined surface 428X. When the user applies pressure or pushing force to the locking part 421X, the locking part 433X moves along the inclined surface 428X into the groove 426X. The angle of the inclined surface is designed to be steeper than the horizontal plane to ensure that the locking part 433X can slide smoothly into the groove 426X when force is applied. The design of the inclined surface not only ensures the stable entry of the locking part 433X, but also reduces jamming or friction caused by direct collision. In some embodiments, the shape of the groove 426X ensures that the locking part 433X is stably engaged therein, thereby completing the locking. The groove 426X can be designed to fit the locking part 433X into place, such as a V-shape, U-shape, or circle, to ensure that the locking part 433X can be stably locked after insertion and to prevent accidental dislodgement.

[0175] In some embodiments, referring to Figures 27 and 28, an exploded view of the folding joint 40X is shown. The folding joint 40X includes a rotating mechanism 440X. The rotating mechanism 440X includes a first rear leg connector 441X, a second rear leg connector 444X, a rider connector 442X, a front leg connector 443X, and a hinge 445X. The first rear leg connector 441X and the second rear leg connector 444X are detachable connection structures. For example, one of the first rear leg connector 441X and the second rear leg connector 444X is provided with one or more connecting posts, and the other is provided with a mating insertion position for the connecting posts. Thus, the first rear leg connector 441X and the second rear leg connector 444X can be assembled together or disassembled, facilitating the disassembly and reassembly of the structure, while the two can be securely connected together. During disassembly, the user only needs to pull out or detach the connection between the connecting post and the insertion position, allowing the rear leg components to be separated. During assembly, the connection is completed by aligning the plug with the connecting post and inserting it, ensuring the stability of the structure. The rider connector 442X, the front foot connector 443X, and the hinge 445X can be assembled between the first rear foot connector 441X and the second rear foot connector 444X. For example, a connecting rod 448X is provided on the first rear foot connector 441X, a first connecting hole 454X matching the connecting rod 448X is provided on the rider connector 442X, a second connecting hole 458X ​​matching the connecting rod 448X is provided on the front foot connector 443X, and a connecting position 461X matching the end of the connecting rod 448X is provided on the second rear foot connector 444X. Thus, the first rear foot connector 441X, the second rear foot connector 444X, the rider connector 442X, and the front foot connector 443X can be connected through the connecting rod 448X, the first connecting hole 454X, the second connecting hole 458X, and the connecting position 461X.

[0176] The hinge 445X is provided with a first hinge portion 462X, a second hinge portion 464, and a positioning portion 463X. A first connecting portion 447X that matches one end of the positioning portion 463X is provided on the first rear foot connector 441X, and a second connecting portion 460X that matches the other end of the positioning portion 463X is provided on the second rear foot connector 444X. A first hinge position 452X that matches the first hinge portion 462X is provided on the rider connector 442X, and a second hinge position 456X that matches the second hinge portion 464 is provided on the front foot connector 443X. Thus, the hinge 445X can be assembled between the first rear foot connector 441X and the rider connector 442X and the front foot connector 443X and the second rear foot connector 444X. The positioning part 463X is connected between the first rear foot connector 441X and the second rear foot connector 444X. Through the cooperation of the first connecting part 447X and the second connecting part 460X with the side components, the positioning function of the hinge 445X is ensured. After assembly, the rider connector 442X can rotate around the connecting rod 448X as the hinge 445X moves along the first hinge position 452X through the first hinge part 462X, and the front foot connector 443X can rotate around the connecting rod 448X as the hinge 445X moves along the second hinge position 456X through the second hinge part 464X, so as to provide the rotation function of the rotating mechanism 440X, realizing the unfolding or folding of the rider connector 442X and the front foot connector 443X relative to the first rear foot connector 441X and the second rear foot connector 444X. The rider connector 442X and the front foot connector 443X are connected by a link 448X to ensure that the rider frame 10X and the front foot frame 20X can move synchronously with the same mechanism during the unfolding and folding of the child vehicle 100X.

[0177] In some embodiments, as shown in Figures 24 and 27, the first rear foot connector 441X has a first rear foot insertion portion 446X, the second rear foot connector 444X has a second rear foot insertion portion 459X, and a locking mechanism 410X is fitted between the first rear foot insertion portion 446X and the second rear foot insertion portion 459X. When the first rear foot insertion portion 446X and the second rear foot insertion portion 459X are assembled together, a slide 413X is provided for the locking mechanism 410X. One end of the joint locking member 412X is connected to the reset member 414X, while the other end is provided with a locking portion 415X. A first engaging portion 451X is provided on the rider connector 442X, and a second engaging portion 455X is provided on the front foot connector 443X. When the rider connector 442X and the front foot connector 443X are assembled together, the locking part 415X can engage with the first locking part 451X and the second locking part 455X, thereby restricting the rotation of the rider connector 442X and the front foot connector 443X. When the joint locking part 412X moves away from the first locking part 451X and the second locking part 455X in the direction formed by the release part 420X along the slide 413X formed by the assembly of the first rear foot insertion part 446X and the second rear foot insertion part 459X, the locking part 415X disengages from the first locking part 451X and the second locking part 455X, and the release part 420X drives the locking mechanism 410X from the locked state to the unlocked state, thereby allowing the rider connector 442X and the front foot connector 443X to rotate.

[0178] Referring to Figures 27 and 28, a mounting hole 425X is provided on the release member 420X, and a mounting position 449X is provided on the first rear foot connector 441X. The release member 420X can be rotatably connected to the mounting position 449X through the mounting hole 425X and the rotating shaft 423X. In addition, an opening is provided in the mounting position 449X, through which the transmission part 422X can pass and extend into the other side of the first rear foot connector 441X to contact the drive part 411X of the locking mechanism 410X, thereby applying external force to the drive part 411X.

[0179] In some embodiments, a front leg insertion tube is provided on the front leg 20X, and a front leg insertion portion 457X that matches the front leg insertion tube is provided on the front leg connector 443X. The front leg insertion portion 457X can be inserted into the front leg insertion tube to achieve the connection between the front leg connector 443X and the front leg 20X. A rider insertion tube is provided on the rider frame 10X, and a rider insertion portion 453X that matches the rider insertion tube is provided on the rider connector 442X. The rider insertion portion 453X can be inserted into the rider insertion tube to achieve the connection between the rider connector 442X and the rider frame 10X. A rear leg insertion tube is provided on the rear leg 30X. The first rear leg insertion part 446X and the second rear leg insertion part 459X are assembled together and matched with the rear leg insertion tube, so that they can be inserted into the rear leg insertion tube as a whole to realize the connection between the first rear leg connector 441X and the second rear leg connector 444X and the rear leg 30X.

[0180] In some embodiments, the child vehicle 100X may be provided with a folding joint 40X having a safety locking mechanism 430X, or folding joints 40X with safety locking mechanisms 430X may be provided on both sides of the frame 110X. The child vehicle 100X equipped with the folding joints 40X of the present application embodiment can improve the structural stability, shock resistance, reliability and safety of long-term use.

[0181] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0182] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A retractable joint, characterized in that, include: The joint body includes at least two connecting seats that are pivotally connected to each other; A locking mechanism having a first locked state and a first unlocked state, wherein when the locking mechanism is in the first locked state, the at least two connecting seats are restricted from relative rotation, and when the locking mechanism is in the first unlocked state, the at least two connecting seats are allowed to rotate relative to each other; and The safety lock mechanism has a second locking state and a second unlocking state. When the safety lock mechanism is in the second locking state, the locking mechanism is restricted from switching to the first unlocking state. When the safety lock mechanism is in the second unlocking state, the locking mechanism is allowed to switch to the first unlocking state.

2. The retractable joint according to claim 1, characterized in that, The safety lock mechanism includes: The safety lock body is movable between a first position and a second position, and the safety lock body has a first locking part; The locking mechanism includes a release element, which is operable to drive the locking mechanism to switch from the first locked state to the first unlocked state. The release element has a second locking part. When the safety lock mechanism is in the second locked state, the safety lock body is in the first position, and the first locking part and the second locking part are locked together. When the safety lock mechanism is in the second unlocked state, the safety lock body is in the second position, and the first locking part and the second locking part are released.

3. The retractable joint according to claim 2, characterized in that, The first locking part is a snap-fit ​​post, the second locking part is a snap-fit ​​groove that can engage with the snap-fit ​​post, and the unlocking member also has a guide slope that is adapted to push against the snap-fit ​​post to guide the snap-fit ​​post into the snap-fit ​​groove.

4. The retractable joint according to claim 2, characterized in that, The safety lock mechanism further includes a retainer, and the safety lock body has a retaining protrusion. The safety lock body is slidable between a first position and a second position. The second position is located in front of the first position in a first direction. When the safety lock body is in the first position, the retainer is located in front of the retaining protrusion in the first direction. During the process of the safety lock body moving from the first position to the second position, the retaining protrusion passes over the retainer and is located in front of the retainer in the first direction, and the retaining protrusion abuts against the retainer to hold the safety lock body in the second position.

5. The retraction joint according to claim 2, characterized in that, The safety lock mechanism further includes a first reset member, which is adapted to apply force to the safety lock body to move the safety lock body to the first position; the safety lock body can be operated to move to the second position.

6. The retractable joint according to claim 2, characterized in that, The safety lock mechanism also includes: The second traction member has a first end and a second end, the first end being connected to the safety lock body, and the second end being adapted to be operated to move the safety lock body from the first position to the second position.

7. The retraction joint according to claim 6, characterized in that, The safety lock body is slidable between the first position and the second position, the second position being located in front of the first position in a first direction, and the safety lock mechanism further includes: A threading ring is located in front of the safety lock body in the first direction. The second traction member is at least partially threaded through the threading ring, and the first end and the second end of the second traction member are located in front of the threading ring in the opposite direction to the first direction.

8. The retraction joint according to claim 1, characterized in that, The locking mechanism includes: The locking element is movable between a locked position and an unlocked position; When the locking member is in the locked position, it is simultaneously located in the at least two connecting seats, thereby restricting the relative rotation of the at least two connecting seats; when the locking member is in the unlocked position, it is released from at least one of the at least two connecting seats, thereby allowing the at least two connecting seats to rotate relative to each other.

9. The retraction joint according to claim 8, characterized in that, The locking mechanism further includes a second reset member adapted to apply force to the locking member to move the locking member to the locked position; the locking mechanism has a release member drivenly connected to the locking member, the release member being operable to drive the locking member to move from the locked position to the release position.

10. The retraction joint according to claim 9, characterized in that, The safety lock mechanism includes: The safety lock body is slidable between a first position and a second position. When the safety lock mechanism is in the second locked state, the safety lock body is in the first position; when the safety lock mechanism is in the second unlocked state, the safety lock body is in the second position. A connector is used to connect the safety lock body and the release mechanism; When the unlocking member is operated to drive the locking member to move from the locked position to the unlocked position, the unlocking member drives the safety lock body to move from the second position to the first position via the connecting member.

11. The retraction joint according to claim 10, characterized in that, The locking member is pivotally connected to the joint body via a pivot. The locking member has a driven part, and the locking member has a driving end. The driving end abuts against the driven part. The connecting member is connected to the first fixing part of the locking member. The driving end and the first fixing part are located on both sides of the pivot.

12. A vehicle, characterized in that, include: Support frame; and The folding joint as described in claim 1 is connected to the support frame to allow the support frame to unfold or fold.

13. The vehicle according to claim 12, characterized in that, The support frame includes at least two frames, which are respectively connected to or integrally formed with the at least two connecting seats in a one-to-one correspondence.

14. The vehicle according to claim 12, characterized in that, The vehicle is a stroller, the support frame is a vehicle frame, the at least two frame bodies include a handlebar frame, a front wheel frame and a rear wheel frame, the at least two connecting seats include a handlebar connecting seat, a front connecting seat and a rear connecting seat, and the handlebar frame, the front wheel frame and the rear wheel frame are respectively connected to the handlebar connecting seat, the front connecting seat and the rear connecting seat in a one-to-one correspondence or are integrally formed in a one-to-one correspondence.

15. The vehicle according to claim 12, characterized in that, The carrier includes two folding joints, which are respectively disposed on opposite sides of the support frame. The carrier also includes a first traction member, the two ends of which are respectively connected to the locking mechanisms of the two folding joints. When the safety lock mechanism is in the second unlocking state, the first traction member can be operated to drive the two locking mechanisms to switch to the first unlocking state.

16. The vehicle according to claim 15, characterized in that, The safety lock mechanism also includes: The second traction member has a first end and a second end, the first end being connected to the safety lock mechanism, and the second end being adapted to be operated to switch the safety lock mechanism from the second locked state to the second unlocked state.

17. The vehicle according to claim 16, characterized in that, The vehicle also includes a shielding member that covers the support frame. The shielding member has a first through hole and a first surface. At least the second end of the second traction member is exposed through the first through hole on the first surface of the shielding member for operation.

18. The vehicle according to claim 16, characterized in that, The vehicle also includes: A limiting ring is connected to the first traction member, and at least part of the second traction member passes through the limiting ring and is movable relative to the limiting ring, with the first end and the second end located on both sides of the limiting ring respectively.

19. The vehicle according to claim 17, characterized in that, The vehicle further includes a limiting ring connected to the first traction member, and at least a portion of the second traction member passes through the limiting ring. The shielding member also has a second surface opposite to the first surface. The limiting ring is exposed on the second surface of the shielding member, and at least the second end of the second traction member is exposed on the first surface of the shielding member through the first through hole.

20. The vehicle according to claim 15, characterized in that, The carrier also includes a shielding member that covers the support frame. The shielding member has a first through hole and a second through hole spaced apart. The shielding member has a first surface and a second surface that are opposite to each other. At least a portion of the first traction member is exposed on the first surface of the shielding member. The two ends of the first traction member pass through the first through hole and the second through hole respectively and are exposed on the second surface of the shielding member, so as to be connected to the locking mechanism of the two folding joints respectively.

Images