Locking joint for folding and unfolding frame and child carrier

Abstract

The invention provides a locking joint. The locking joint comprises a first connecting seat and a second connecting seat, the first connecting seat and the second connecting seat can pivot relative to each other in the axial direction and the circumferential direction; the locking piece is arranged between the first connecting base and the second connecting base in the axial direction, can move relative to the first connecting base and the second connecting base in the axial direction and is clamped with the first connecting base and the second connecting base, the first connecting base is provided with a limiting part extending in the axial direction, the locking piece is provided with a clamping part extending in the axial direction, and the clamping part is clamped with the limiting part. And when the locking piece is clamped with the second connecting seat and the clamping part is clamped with the limiting part, the first connecting seat can pivot relative to the second connecting seat along the forward direction of the circumferential direction, but cannot pivot relative to the second connecting seat along the reverse direction of the circumferential direction. The invention further provides a child carrier.

Description

Technical Field

[0001] The present disclosure relates to a locking joint for folding and unfolding a vehicle frame, and a child carrier vehicle. Background Art

[0002] Currently, child carrier vehicles, such as baby carriages, all have a folding and closing function, which is convenient for carrying and using when going out. The folding and locking is mostly achieved by setting a folding hook structure to prevent the vehicle frame from unfolding accidentally after folding. However, when unlocking the common folding hook, it is necessary to manually operate the unlocking member to unlock, especially it cannot be unfolded with one hand, resulting in inconvenient operation. In addition, setting a folding hook structure on the vehicle frame makes the overall vehicle frame less aesthetically pleasing. Summary of the Invention

[0003] According to the present disclosure, a locking joint is proposed, including: a first connecting seat; a second connecting seat, the first connecting seat and the second connecting seat can pivot relative to each other axially and circumferentially; a locking member, axially arranged between the first connecting seat and the second connecting seat and can move axially relative to both and engage with both. Wherein, a limiting portion extending axially is provided on the first connecting seat, and an engaging portion extending axially is provided on the locking member. When the locking member engages with the second connecting seat and the engaging portion engages with the limiting portion, the first connecting seat can pivot relative to the second connecting seat in the positive circumferential direction, but cannot pivot relative to the second connecting seat in the reverse circumferential direction.

[0004] In one embodiment, a plurality of first teeth spaced circumferentially are provided on the inner circumference of the first connecting seat, a plurality of second teeth spaced circumferentially are provided on the inner circumference of the second connecting seat, a plurality of engaging teeth spaced circumferentially and capable of engaging with the first teeth and the second teeth are provided on the outer circumference of the locking member. The limiting portion is provided at the end face of the first tooth axially close to the second connecting seat, the engaging portion is provided at the end face of the engaging tooth axially away from the second connecting seat. The first connecting seat further has a blocking surface, the blocking surface is located on one side of the limiting portion in the circumferential direction and is on the same first tooth as the limiting portion; the locking member further has a abutting surface, the abutting surface is located on one side of the engaging portion in the circumferential direction and is on the same engaging tooth as the engaging portion; when the locking member engages with the second connecting seat and the engaging portion engages with the limiting portion, the plurality of engaging teeth are interlaced and engaged with the plurality of second teeth in the circumferential direction, and at least one engaging tooth is axially opposite to at least one first tooth, the blocking surface and the abutting surface are in circumferential abutment with each other, and the abutting surface is located on the reverse circumferential direction side of the blocking surface to limit the limiting portion from pivoting relative to the engaging portion in the reverse circumferential direction, except for the engaging tooth provided with the abutting surface.

[0005] In one embodiment, the engaging portion axially protrudes from the end face of the corresponding engaging tooth away from the second connecting seat towards the first connecting seat, and the abutting surface is located on the surface of the engaging portion on the positive circumferential direction side.

[0006] In one embodiment, the engaging portion is located on the side opposite to the corresponding tooth in the circumferential direction and does not extend to the side of the corresponding tooth in the positive circumferential direction; the limiting portion is recessed axially from the end surface of the corresponding first tooth towards the second connecting seat and away from the second connecting seat. The limiting portion is located on the side opposite to the corresponding tooth in the circumferential direction and penetrates the first tooth in the circumferential reverse direction. The blocking surface is located on the positive circumferential side of the limiting portion; when the limiting portion and the engaging portion are engaged, at least a part of the engaging portion is embedded in the limiting portion.

[0007] In one embodiment, both the blocking surface and the abutting surface are parallel to the axial direction.

[0008] In one embodiment, at least one of the first connecting seat and the locking member is provided with a guiding inclined surface for guiding the first tooth provided with the limiting portion to pass over the engaging portion in the positive circumferential direction; the guiding inclined surface is provided on the surface of the first tooth provided with the limiting portion on the positive circumferential side and is inclined along the axial and circumferential directions; and / or, the guiding inclined surface is provided on the surface of the engaging portion on the circumferential reverse side and is inclined along the axial and circumferential directions.

[0009] In one embodiment, the first connecting seat is further provided with an abutting surface located on one circumferential side of the blocking surface, and the abutting surface and the blocking surface are located on the same first tooth; the locking member is further provided with an abutting surface located on one circumferential side of the abutting surface, and the abutting surface and the abutting surface are located on the same tooth; when the locking member is engaged with the second connecting seat and the engaging portion is engaged with the limiting portion, the abutting surface and the abutting surface are axially abutted against each other.

[0010] In one embodiment, the abutting surface is located on the circumferential reverse side of the blocking surface and on the axial side of the limiting portion, and the abutting surface is located on the circumferential reverse side of the abutting surface and on the axial side of the engaging portion; or, the abutting surface is located on the positive circumferential side of the blocking surface, and the abutting surface is located on the positive circumferential side of the abutting surface.

[0011] In one embodiment, the engaging portion is located at the outer end of the corresponding tooth in the radial direction; the limiting portion protrudes axially from the end surface of the first tooth towards the second connecting seat. The limiting portion is located on the circumferential reverse side of the first tooth and does not extend to the positive circumferential side of the first tooth. The blocking surface is located on the surface of the limiting portion on the positive circumferential side; when the limiting portion and the engaging portion are engaged, the engaging portion abuts against the limiting portion in the circumferential direction.

[0012] In one embodiment, both the blocking surface and the abutting surface are inclined along the radial and circumferential directions.

[0013] In one embodiment, at least one of the first connecting seat and the locking member is provided with a guiding inclined surface for guiding the limiting portion provided thereon to move circumferentially in the positive direction over the engaging portion; the guiding inclined surface is provided on the surface of the limiting portion on the positive side in the circumferential direction and is inclined in the radial and circumferential directions; and / or, the guiding inclined surface is provided on the surface of the engaging portion on the negative side in the circumferential direction and is inclined in the radial and circumferential directions.

[0014] In one embodiment, the inclination angle of the abutting surface is greater than the inclination angle of the guiding inclined surface.

[0015] In one embodiment, the locking member is provided with a recess, which is recessed axially from the end surface of the engaging tooth provided with the engaging portion away from the second connecting seat towards the side of the second connecting seat and is formed radially between the engaging portion and the corresponding engaging tooth.

[0016] In one embodiment, the first connecting seat is further provided with a stopping surface located on the end surface of the first tooth provided with the limiting portion close to the second connecting seat in the axial direction and on the positive side in the circumferential direction of the blocking surface; the locking member is further provided with an abutting surface located on the end surface of the engaging portion away from the second connecting seat in the axial direction; when the locking member is engaged with the second connecting seat and the engaging portion is engaged with the limiting portion, the stopping surface and the abutting surface are axially abutted against each other.

[0017] In one embodiment, except for the first tooth provided with the limiting portion, each of the other first teeth has a groove, which is recessed axially from the end surface of the corresponding first tooth close to the second connecting seat towards the side away from the second connecting seat, and the groove penetrates the corresponding first tooth in the circumferential direction, and the groove is used to axially receive the engaging portion.

[0018] In one embodiment, the depth of the groove is greater than or equal to the length of the engaging portion.

[0019] In one embodiment, the limiting portion protrudes axially from the end surface of the corresponding first tooth close to the second connecting seat towards the side of the second connecting seat, and the blocking surface is located on the surface of the limiting portion on the negative side in the circumferential direction; the engaging portion is recessed from the end surface of the corresponding engaging tooth away from the second connecting seat towards the second connecting seat, the abutting surface is located on the negative side in the circumferential direction of the engaging portion, and the engaging portion penetrates the engaging tooth in the positive direction of the circumferential direction; except for the engaging tooth provided with the engaging portion, each of the other engaging teeth has a groove, which is recessed axially from the end surface of the corresponding engaging tooth away from the second connecting seat towards the second connecting seat, and the groove penetrates the corresponding engaging tooth in the circumferential direction, and the groove is used to axially receive the limiting portion.

[0020] In one embodiment, two limiting portions are provided on the first connecting seat, and the two limiting portions are respectively provided on two first teeth, and two engaging portions are provided on the second connecting seat, and the two engaging portions are respectively provided on two engaging teeth.

[0021] In one embodiment, the locking joint includes a driving member axially disposed between the first connecting seat and the locking member to drive the locking member to move towards the second connecting seat.

[0022] In one embodiment, the locking joint includes an elastic member axially disposed between the second connecting seat and the locking member to urge the locking member to move towards the first connecting seat.

[0023] According to the present disclosure, a child carrier is provided, which includes: a frame; and a locking joint according to the present disclosure. Wherein, the frame includes a push handle and a linkage rod pivotally connected to the push handle through the locking joint. The push handle is connected to the first connecting seat, and the linkage rod is connected to the second connecting seat. The push handle pivots towards the linkage rod in the positive circumferential direction to achieve the folding between the push handle and the linkage rod, and the push handle pivots away from the linkage rod in the opposite circumferential direction to achieve the unfolding between the push handle and the linkage rod.

[0024] According to the present disclosure, a child carrier is provided, which includes: a frame; and a locking joint according to the present disclosure. Wherein, the frame includes a push handle and a linkage rod pivotally connected to the push handle through the locking joint. The push handle is connected to the first connecting seat, and the linkage rod is connected to the second connecting seat. The push handle pivots towards the linkage rod in the positive circumferential direction to achieve the folding between the push handle and the linkage rod, and the push handle pivots away from the linkage rod in the opposite circumferential direction to achieve the unfolding between the push handle and the linkage rod; the push handle has an operating member connected to the driving member, and the operating member is operated to drive the locking member to move towards the second connecting seat, so that the locking member engages with the second connecting seat and the first connecting seat can pivot relative to the second connecting seat. Description of the Drawings

[0025] Figure 1 is a side view of the child carrier according to the present disclosure in the unfolded state;

[0026] Figure 2 is a front perspective view of the child carrier according to the present disclosure in the unfolded state;

[0027] Figure 3 is a rear perspective view of the child carrier according to the present disclosure in the folded and locked state;

[0028] Figure 4 is an exploded view of the locking joint according to an embodiment;

[0029] Figure 5 is an exploded view of the locking joint according to an embodiment;

[0030] Figure 6 is a perspective view of the first connecting seat according to an embodiment;

[0031] Figure 7 is a perspective view of the locking member according to an embodiment;

[0032] Figure 8 is a cross-sectional view of a locking joint according to an embodiment when the vehicle frame is in the deployed state;

[0033] Figure 9 is a partial circumferential cross-sectional schematic view of a locking joint according to an embodiment in the unlocked state;

[0034] Figure 10 is a cross-sectional view of a locking joint according to an embodiment when the vehicle frame is in the folded and locked state;

[0035] Figure 11 is a perspective view of a locking joint according to an embodiment;

[0036] Figure 12 is an exploded view of a locking joint according to another embodiment;

[0037] Figure 13 is an exploded view of a locking joint according to another embodiment;

[0038] Figure 14 is a perspective view of a first connecting seat and a locking member according to another embodiment;

[0039] Figure 15 is a cross-sectional view of a locking member according to another embodiment;

[0040] Figure 16 is a partial circumferential schematic view of a locking joint according to another embodiment in the unlocked state;

[0041] Figure 17 is a perspective view of a first connecting seat, a locking member, and a spring according to another embodiment; and

[0042] Figure 18 is a perspective view of a locking joint according to another embodiment.

[0043] List of Reference Numerals

[0044] 1 Child carrier

[0045] 10, 10A Push handle

[0046] 11 Operating member

[0047] 20, 20A Linkage rod

[0048] 30 Rider

[0049] 40 Front foot assembly

[0050] 50 Rear foot assembly

[0051] 60 Seat assembly

[0052] 70 Armrest

[0053] 100, 100A locking joint

[0054] 110, 110A first connecting seat

[0055] 111, 111A first tooth

[0056] 112, 112A pin shaft

[0057] 113, 113A driving part

[0058] 114, 114A locking part

[0059] 115, 115A locking part

[0060] 116, 116A limiting part, notch, bump

[0061] 117, 117A groove

[0062] 118, 118A blocking surface

[0063] 119, 119A abutting surface

[0064] S guiding inclined plane

[0065] 120, 120A second connecting seat

[0066] 121, 121A second tooth

[0067] 122, 122A locking part

[0068] 123, 123A locking part

[0069] 130, 130A locking piece

[0070] 131, 131A meshing teeth

[0071] 132, 132A locking teeth

[0072] 133, 133A perforation

[0073] 134, 134A locking teeth

[0074] 135, 135A engaging part, protrusion, rib

[0075] 136, 136A spring accommodating part

[0076] 137A recess

[0077] 138, 138A guiding inclined plane

[0078] 139, 139A abutting surface

[0079] 160, 160A abutting surface

[0080] 140, 140A driving members

[0081] 141, 141A perforations

[0082] 142, 142A driving parts

[0083] 150, 150A elastic members, springs

[0084] 200 frame joints

[0085] I axial direction

[0086] C circumferential direction

[0087] D1 closing direction, positive direction of circumferential direction C

[0088] D2 unfolding direction, negative direction of circumferential direction C Detailed implementation manners

[0089] Although the present invention is described and illustrated herein with reference to specific embodiments, the invention should not be limited to the details shown. Rather, various modifications may be made within the scope of the equivalent solutions of the claims without departing from the invention.

[0090] The directional descriptions such as "front", "rear", "upper", "lower", etc. involved herein are only for convenience of understanding. The present invention is not limited to these directions and can be adjusted according to actual situations. Although the present application has been described and enumerated with reference to typical embodiments, the terms used are illustrative and exemplary, not restrictive terms.

[0091] Figure 1FIG. 0 is a side view of a child carrier 1 according to the present disclosure in an unfolded state. The child carrier 1 is, for example, a stroller and has a frame. The frame includes a push handle 10, a linkage rod 20, a rider 30, a front foot assembly 40, a rear foot assembly 50, a seat assembly 60, and an armrest 70. The front foot assembly 40, the rear foot assembly 50, and the rider 30 are pivotally connected to each other at a frame joint 200. The rider 30 is pivotally connected to the push handle 10. The push handle 10 is pivotally connected to the linkage rod 20 through a locking joint 100. The other end of the linkage rod 20 is pivotally connected to the rear foot assembly 50. The locking joint 100 has a first locked state, a second locked state, and an unlocked state. When the locking joint 100 is in the first locked state, the push handle 10 cannot pivot relative to the linkage rod 20, and the two are in a locked state. When the locking joint 100 is in the second locked state, the push handle 10 can only pivot relative to the linkage rod 20 in the positive direction of the pivot direction (i.e., the folding direction D1), and cannot rotate relative to the linkage rod 20 in the reverse direction of the pivot direction. When the locking joint 100 is in the unlocked state, the push handle 10 can pivot relative to the linkage rod 20 in both the positive and negative directions of the pivot direction. According to the present disclosure, when the frame is in the unfolded state, the locking joint 100 is in the first locked state, so that the push handle 10 and the linkage rod 20 are relatively fixed to avoid accidental folding. At this time, a child can ride on the frame, and a user can push the frame. As shown later Figure 3 As shown, when the frame is in the folded and locked state, the locking joint 100 is in the second locked state, so that the push handle 10 can only pivot relative to the linkage rod 20 in the direction close to the linkage rod 20 (corresponding to the positive direction of the pivot direction, i.e., the folding direction D1), but the push handle 10 cannot pivot relative to the linkage rod 20 in the direction away from the linkage rod 20 (corresponding to the reverse direction of the pivot direction, i.e., the unfolding direction D2). When the frame is switched from the unfolded state to the folded state, the locking joint 100 is in the unlocked state. At this time, the push handle 10 can pivot relative to the linkage rod 20 in both the direction close to the linkage rod 20 and the direction away from the linkage rod 20.

[0092] Figure 2 FIG. 6 is a front perspective view of the child carrier 1 according to the present disclosure in an unfolded state. According to Figure 2The connection relationships of the push handle 10, the linkage rod 20, the rider 30, the front foot assembly 40, the rear foot assembly 50, the seat assembly 60, and the armrest 70 can be clearly seen. An operating member 11 is provided on the push handle 10. For example, the operating member 11 is provided on the top crossbar of the push handle 10. For example, the operating member 11 is a button. The operating member 11 is connected to the locking joint 100 and is used to release the first locked state of the locking joint 100 and switch the locking joint 100 from the first locked state to the unlocked state. For example, the operating member 11 is connected to the locking joint 100 through a traction member (such as a rope, a cable, etc.) extending inside the push handle 10. It can be known that through the traction member, when the operating member 11 moves, some components of the locking joint 100 can be driven to move, so as to switch the state of the locking joint 100. According to this embodiment, when the operating member 11 is operated, for example, when the operating member 11 is pressed, the locking joint 100b can be switched from the first locked state to the unlocked state, so that the push handle 10 can pivot relative to the linkage rod 20 in a direction close to the linkage rod 20, that is, for the child carrier 1 originally in the unfolded state, its push handle 10 can pivot toward the side close to the linkage rod 20 to fold the push handle 10 toward the linkage rod 20. Specifically, as Figure 2 shown, the push handle 10 can be pushed toward the linkage rod 20 and rotate counterclockwise relative to the linkage rod 20 around the locking joint 100, thereby driving the linkage rod 20, the rider 30, the front foot assembly 40, and the rear foot assembly 50 to fold relative to each other. For the folded and locked state after folding, refer to Figure 3 , at this time, the user can lift the entire child carrier 1 by using the armrest 70 for easy carrying or storage. And the frame changes from Figure 2 the unfolded state to Figure 3 the folded and locked state, during which the push handle 10 can pivot relative to the linkage rod 20 in a direction close to the linkage rod 20 and can also pivot relative to the linkage rod 20 in a direction away from the linkage rod 20.

[0093] Figure 4 is an exploded view of the locking joint 100 according to an embodiment. According to this embodiment, the locking joint 100 has a first connecting seat 110, a second connecting seat 120, a locking member 130, a driving member 140, and an elastic member 150 arranged along the axial direction I. The first connecting seat 110 is fixedly connected to the push handle 10, the second connecting seat 120 is fixedly connected to the linkage rod 20, and the driving member 140, the locking member 130, and the elastic member 150 are sequentially accommodated between the first connecting seat 110 and the second connecting seat 120. Among them, the first connecting seat 110 can pivot relative to the second connecting seat 120 around the axial direction I along the circumferential direction C. It can be known that the circumferential direction C is arranged around the axial direction I, where the circumferential direction C corresponds to the pivoting direction, and the positive direction of the circumferential direction C corresponds to the folding direction D1, and the opposite direction of the circumferential direction C corresponds to the unfolding direction D2.

[0094] Figure 7 is Figure 4The perspective view of the locking member 130 after inversion, as shown in Figure 4 and Figure 7 shown, the locking member 130 is similar to an annular gear, and its outer circumference has a plurality of teeth evenly distributed at intervals along the circumferential direction C. The plurality of teeth include a plurality of meshing teeth 131, two locking teeth 132, 134 provided between two adjacent meshing teeth 131 and spaced from the meshing teeth 131, and a circular through hole 133 penetrating the locking member 130 along the axial direction I. The two locking teeth 132, 134 are spaced apart in the radial direction, that is, the centers of the two locking teeth 132, 134 are oppositely arranged at 180°, and the shapes of the two locking teeth 132, 134 are different. According to the present disclosure, only one locking tooth 132 or 134 may be provided, or the two locking teeth 132, 134 may not be oppositely arranged in the radial direction, that is, the centers of the two locking teeth 132, 134 are not oppositely arranged at 180°, but are arranged at an angle between 0° and 180°. The present disclosure is not limited thereto. It can be seen that the radial direction is perpendicular to the axial direction I and the circumferential direction C.

[0095] The elastic member 150 (such as a compression spring in a spring, hereinafter described with the spring 150) is disposed between the second connection seat 120 and the locking member 130 to apply a driving force for the locking member 130 to enter the first connection seat 110.

[0096] The driving member 140 has an elongated through hole 141 and a driving portion 142, and its upper end is connected to the operating member 11 through a traction member provided, for example, in the push handle 10. The elongated through hole 141 penetrates the driving member along the axial direction I, and the elongated through hole 141 extends in the radial direction. The driving portion 142 is disposed on opposite sides of the elongated through hole 141 and extends in the radial direction and the axial direction I, and is in a ramp shape so as to be slidably engaged with a ramp-shaped driving portion 113 in the first connection seat 110 (see below and Figure 5 ).

[0097] The second connection seat 120 is provided with a circular accommodation portion, which has locking portions 122 and 123 arranged at intervals in the radial direction on its inner circumference, and a plurality of second teeth 121 arranged at uniform intervals in the circumferential direction C between the locking portions 122 and 123. When the locking member 130 enters the circular accommodation portion of the second connection seat 120, the meshing teeth 131 of the locking member 130 will be arranged in a staggered manner with the second teeth 121 of the second connection seat 120 in the circumferential direction C, and the locking teeth 132 and 134 of the locking member 130 will be received in the locking portions 122 and 123 along the axial direction I. At this time, the locking member 130 cannot rotate relative to the second connection seat 120 in the circumferential direction C. Since the shapes of the locking teeth 132 and the locking teeth 134 are different, the locking portions 122 and 123 are also correspondingly different in shape, so that the locking teeth 132 will not be caught in the mismatched locking portion 114, and the locking teeth 134 will not be caught in the mismatched locking portion 115. Furthermore, the locking member 130 can only enter the circular accommodation portion of the second connection seat 120 at a specific position. The bottom of the second connection seat 120 is used to support the spring 150 along the axial direction I.

[0098] Figure 5 is an exploded view of the locking joint 100 according to an embodiment. Figure 5 and Figure 4 have opposite viewing directions, so that the internal structure of the first connection seat 110 can be seen. Figure 6 is Figure 5 a perspective view of the first connection seat 110 of Figure 5 . The first connection seat 110 correspondingly to the second connection seat 120 is also provided with a circular accommodation portion, which also has locking portions 114 and 115 arranged at intervals in the radial direction on its inner circumference, and a plurality of first teeth 111 arranged at uniform intervals in the circumferential direction C between the locking portions 114 and 115. The number and arrangement of the first teeth 111 correspond to the plurality of second teeth 121 of the second connection seat 120, and the relative positional relationship between the locking portions 114, 115 and the plurality of first teeth 111 corresponds to the relative positional relationship between the locking portions 122, 123 and the plurality of second teeth 121. Similarly, when the locking member 130 enters the circular accommodation portion of the first connection seat 110, the meshing teeth 131 of the locking member 130 will be arranged in a staggered manner with the second teeth 111 of the first connection seat 110 in the circumferential direction C, and the locking teeth 132 and 134 of the locking member 130 will move along the axial direction I and be received in the two locking portions 114, 115 (see Figure 5 ), at this time the locking member 130 cannot rotate relative to the first connection seat 110 in the circumferential direction C. Similarly, the locking portions 114 and 115 are also correspondingly different in shape to be able to receive the locking teeth 132 and 134 along the axial direction I, so that the locking member 130 can only enter the circular accommodation portion of the first connection seat 110 at a specific position.

[0099] At the center of the bottom of the first connecting seat 110, a pin shaft 112 extending along the axial direction I towards the second connecting seat 120 is provided. The other end of the pin shaft 112 will extend to the second connecting seat 120 when the first connecting seat 110 and the second connecting seat 120 are assembled. The shape and size of the circular perforation 133 of the locking member 130 are adapted to those of the pin shaft 112, such that the locking member 130 can be supported and rotated around the pin shaft 112.

[0100] On the bottom of the first connecting seat 110, a ramp-shaped driving portion 113 is further provided. The shape of the driving portion 113 corresponds to that of the ramp-shaped driving portion 142 of the driving member 140. Both the driving portion 113 of the first connecting seat 110 and the driving portion 142 of the driving member 140 are provided with inclined surfaces that abut against each other along the axial direction I. The inclined surfaces of both are inclined along the axial direction I and the radial direction and are parallel to each other. In addition, the pin shaft 112 passes through the elongated perforation 141 of the driving member 40 along the axial direction I, and the width of the elongated perforation 141 in the radial direction is greater than that of the pin shaft 112, such that the driving member 140 can move relative to the pin shaft 112 in the radial direction through the elongated perforation 141. For example, when the operating member 11 pulls the driving member 140 radially (such as Figure 4 、 Figure 5 as shown, upwards) through the traction member, due to the inclined surface of the ramp-shaped driving portion 113 being inclined along the radial direction and the axial direction I, when the driving member 140 moves in the radial direction, it will also move along the axial direction I towards the side away from the first connecting seat 110. Thus, it can drive the locking member 130 adjacent to it along the axial direction I to also translate along the axial direction I towards the side away from the first connecting seat 110 and compress the spring 150.

[0101] According to this embodiment, the first connecting seat 110 includes two limiting portions 116. The two limiting portions 116 (such as the notch 116, which will be described below with the notch 116) are correspondingly provided on two first teeth 111 spaced apart along the circumferential direction C. The two first teeth 111 are spaced approximately 180° apart. The notch 116 is recessed along the axial direction I from the end face of the corresponding first tooth 111 close to the second connecting seat 120 towards the side away from the second connecting seat 120, and is provided on the side of the corresponding first tooth 111 opposite to the circumferential direction C, that is, on the side of the unfolding direction D2, and penetrates the first tooth 111 along the opposite direction D2 of the circumferential direction C, but does not penetrate the first tooth 111 along the positive direction D1 of the circumferential direction C. That is, the notch 116 does not penetrate the entire corresponding first tooth 111 along the circumferential direction C. Thus, a blocking surface 118 located on the positive direction D1 side of the notch 116 in the circumferential direction C and a stopping surface 119 located on one side of the notch 116 along the axial direction I are formed on the first connecting seat 110. Specifically, the blocking surface 118 extends along the axial direction I, and the stopping surface 119 extends along a direction intersecting the axial direction I. For example, the blocking surface 118 is parallel to the axial direction I, and the stopping surface 119 is parallel to the direction perpendicular to the axial direction I. That is, the blocking surface 118 and the stopping surface 119 are perpendicular to each other.

[0102] In addition to providing the first teeth of the notch 116, on the remaining first teeth 111, a groove 117 is formed by recessing from the end face of each first tooth 111 closer to the second connecting seat 120 in the axial direction I towards the side away from the second connecting seat 120. The groove 117 extends through the entire corresponding first tooth 111 in the circumferential direction C, but does not extend through the entire corresponding first tooth 111 in the radial direction. That is, the bottom of the groove 117 is not the end face of the first tooth 111 closest to the second connecting seat 120 in the axial direction I, and the depth of the recess of the groove 117 is equal to or greater than the length of the protrusion 135 extending.

[0103] Figure 7 The angle at which the shown locking member 130 is located is at Figure 6On the mirror image side of the angle at which the first connecting seat 110 is located as shown. According to this embodiment, the locking member 130 is further provided with two engaging portions 135. The two engaging portions 135 are configured to be received in the two notches 116 of the first connecting seat 110 when the locking joint 100 is in the second locking state. The two engaging portions 135 (such as protrusions 135, which will be described below with protrusions 135) are correspondingly arranged on two engaging teeth 131 spaced apart along the circumferential direction C. The two engaging teeth 131 are arranged at an interval of approximately 180°. Specifically, the protrusion 135 protrudes from the end surface of the corresponding engaging tooth 131 away from the second connecting seat 120 along the axial direction I towards the first connecting seat 110, and is provided on one side of the corresponding engaging tooth 131 in the opposite direction D2 of the circumferential direction C, but not on one side of the corresponding engaging tooth 131 in the positive direction D1 of the circumferential direction C. That is to say, the protrusion 135 is not continuously arranged on the entire end surface of the corresponding engaging tooth 131 away from the second connecting seat 120 in the axial direction I along the circumferential direction C. In other words, the cross-section of the protrusion 135 is smaller than the cross-section of the corresponding engaging tooth 131. The locking member 130 further has a guiding inclined surface 138, a abutting surface 139, and an abutting surface 160. The guiding inclined surface 138, the abutting surface 139, and the abutting surface 160 are all formed on the surface of the protrusion 135. Specifically, the guiding inclined surface 138 is formed on the surface of the protrusion 135 on the side in the opposite direction D2 of the circumferential direction C, and is inclined along the axial direction I and the circumferential direction C. The abutting surface 139 is formed on the surface of the protrusion 135 on the side in the positive direction D1 of the circumferential direction C and extends along the axial direction I. The abutting surface 160 is formed on the end surface of the protrusion 135 in the axial direction I. Specifically, the guiding inclined surface 138 is arranged as an arc surface inclined along the axial direction I and the circumferential direction C. The abutting surface 139 is parallel to the axial direction I. The abutting surface 160 extends in a direction perpendicular to the axial direction I, and the guiding inclined surface 138, the abutting surface 160, and the abutting surface 139 are sequentially connected to each other. Among them, the guiding inclined surface 138 is used to guide the first tooth 111 provided with the notch 116 to slide along the positive direction D1 of the circumferential direction C to the end surface of the protrusion 135 along the axial direction I. The abutting surface 139 is used to abut against the blocking surface 118 along the positive direction D1 of the circumferential direction C to limit the first tooth 111 provided with the notch 116 from crossing over the protrusion 135 along the opposite direction D2 of the circumferential direction C. The abutting surface 160 is used to axially abut against the abutting surface 119 to limit the depth of the protrusion 135 extending into the first connecting seat 130, and further limit the depth of the locking member 130 extending into the first connecting seat 110. According to the present disclosure, the protrusion 135 can also be arranged on the locking teeth 132, 134.According to the present disclosure, the guiding inclined surface 138 may also be provided on the surface of the first tooth 111 provided with the notch 116, rather than on the surface of the protrusion 135. Specifically, it is provided on one side of the first tooth 111 along the positive direction D1 of the circumferential direction C to guide the first tooth 111 to slide along the positive direction D1 of the circumferential direction C to the end face of the protrusion 135 along the axial direction I. Alternatively, the guiding inclined surface 138 may be provided on both the surface of the first tooth 111 provided with the notch 116 and the surface of the protrusion 135.

[0104] According to Figures 8 to 11 to illustrate the operation of the locking joint 100 according to the present disclosure. Figure 8 is a cross-sectional view of the locking joint 100 according to an embodiment when the vehicle frame is in the deployed state. Figure 10 is a cross-sectional view of the locking joint 100 according to an embodiment when the vehicle frame is in the retracted and locked state.

[0105] Figure 8 In the locking joint 100 in Figure 1 , 2 's state, the push handle 10 and the linkage rod 20 are substantially in a straight line, and the vehicle frame is locked in the deployed state. At this time, the locking teeth 132 and 134 of the locking member 130 are simultaneously received in the locking portions 114 and 115 of the first connecting seat 110 (see Figure 6 ) and the locking portions 122 and 123 of the second connecting seat 120 (see Figure 4 ) along the axial direction I. And the engaging teeth 131 of the locking member 130 (see Figure 7 ) also simultaneously engage with the first tooth 111 (see Figure 6 ) and the second tooth 121 (see Figure 4 ) along the circumferential direction C. That is, the engaging teeth 131, the locking teeth 132, and the locking teeth 134 simultaneously engage with the first tooth 111 and the second tooth 121 along the circumferential direction C. The first tooth 111 and the second tooth 121 are arranged opposite to each other along the axial direction I, so that neither the push handle 10 nor the linkage rod 20 can pivot relative to the locking member 130, that is, neither the push handle 10 nor the linkage rod 20 can pivot relative to each other, thereby avoiding the accidental retraction of the push handle 10 relative to the linkage rod 20 when the vehicle frame is in the deployed state. In addition, the protrusion 135 provided on the engaging teeth 131 is also located between two first teeth 111 along the circumferential direction C at this time, and the notch 116 is provided on the first tooth 111. It can be seen that the protrusion 135 and the notch 116 are arranged along the circumferential direction C, and the protrusion 135 is arranged farther from the second connecting seat 120 along the axial direction I than the notch 116.

[0106] In this case, the driving member 140 is not operated, and the pin shaft 112 of the first connecting seat 110 and one end of the elongated through hole 141 of the driving member 140 (such as Figure 8...abuts against the upper end). The spring 150 between the second connector 120 and the locking member 130 applies an upward thrust to the locking member 130 in the spring receiving portion 136 of the locking member 130, such that the other side of the locking member 130 abuts against the driving member 140, and the driving member 140 abuts against the first connector 110.

[0107] Figure 10 ...the locking joint 100 is in the second locking state, corresponding to Figure 3 ...the state where the push handle 10 and the linkage rod 20 are retracted, and the vehicle frame is in the retracted and locked state. To achieve this state, the user can press Figure 2 ...the operating member 111 shown in Figure 8 ...to remotely operate the driving member 140 (as shown in Figure 8The position of the abutting first connecting seat 110 moves along the axial direction I towards the second connecting seat 120. Thus, the driving member 140 applies a thrust towards the second connecting seat 120 to the locking member 130 and compresses the spring 150, causing the locking member 130 to move away from the first connecting seat 110 along the axial direction I, such that the engaging teeth 131, locking teeth 132, and locking teeth 134 of the locking member 130 only stagger circumferentially C with the second teeth 121 of the second connecting seat 120 for engagement and disengage from the first teeth 111 of the first connecting seat 110. The locking teeth 132 and 134 of the locking member 130 are only received in the locking portions 122 and 123 of the second connecting seat 120 and disengage from the locking portions 114 and 115 of the first connecting seat 110 along the axial direction I. However, the two protrusions 135 are still received in the first connecting seat 110. At this time, the locking member 130 still cannot rotate relative to the second connecting seat 120, that is, the locking member 130 and the second connecting seat 120 are relatively fixed. Thus, the first connecting seat 110 can rotate relative to the linkage rod 20 and the locking member 130 provided with the second connecting seat 120 as the push handle 10 is pushed along the closing direction D1, enabling the push handle 10 and the linkage rod 20 to close with each other. After the push handle 10 starts to rotate along the closing direction D1, the locking joint 100 is in the unlocked state, and the user can release the operating member 11. In this case, after the first connecting seat 110 and the second connecting seat 120 rotate relative to each other, the locking teeth 132 and 134 no longer face the locking portions 114 and 115 along the axial direction I but are misaligned with each other circumferentially C, that is, the locking teeth 132 and 134 cannot be received in the locking portions 114 and 115 along the axial direction I by the elastic force of the spring 150 anymore. Instead, the locking teeth 132 and 134 can only abut against the first teeth 111 along the axial direction I by the elastic force of the spring 150. Specifically, the locking teeth 132 and 134 will abut against the end face of the first teeth 111 along the axial direction I, and some of the engaging teeth 131 will also abut against the end face of the first teeth 111 along the axial direction I. Each protrusion 135 will move circumferentially C into the plurality of grooves 117 or be located circumferentially C between two first teeth 111, but will not be blocked by the first teeth 111 circumferentially C. The driving member 140 will disengage from abutting against the locking member 130 and resume abutting against the first connecting seat 110, and is spaced apart from the locking member 130 along the axis. During this process, the relative rotation between the first connecting seat 110 and the second connecting seat 120 will not be blocked circumferentially C until the first teeth 111 provided with the notch 116 move along the closing direction D1 to one side of the protrusion 135, as Figure 9 shown.

[0108] Figure 9Schematic diagram of a partial circumferential cross-section of the locking joint 100 in the unlocked state. The schematic diagram cuts the locking joint 100 at the engaging teeth 131 provided with the protrusions 135 and the first tooth 111 provided with the notch 116 (the two first teeth 111 provided with the notch 116 will simultaneously move to one side of the two protrusions 135 along the closing direction D1 respectively. Only one of the first teeth 111 and the corresponding protrusion 135 will be taken as an example for illustration below). When the first tooth 111 provided with the notch 116 continues to move along the closing direction D1 from the state shown in Figure 9 , the first tooth 111 provided with the notch 116 will be blocked by the protrusion 135 along the closing direction D1, and will further overcome the elastic force of the spring 150 along the guiding inclined surface 138 of the protrusion 135 (that is, further compress the spring 150, further push the locking member 130 towards the second connecting seat 120, reducing the hard interference between the first tooth 111 provided with the notch 116 and the protrusion 135) and move axially I to the end face of the protrusion 135 (that is, the abutting surface 160). During this process, the user will feel the resistance brought to the push handle 10 due to the contact between the protrusion 135 and the first tooth 111, indicating that the locking joint 100 is about to reach the closing and locking state and the frame is about to reach the locked and closed state. Until the notch 116 is axially opposite to the protrusion 135, the locking member 130 will push the protrusion 135 into the notch 116 due to the elastic force of the spring 150, so that the protrusion 135 is engaged with the notch 116, and the abutting surface 160 abuts against the abutting surface 119 axially I, restricting the protrusion 135 from further extending into the first connecting seat 110. At this time, the frame is in Figure 3 the locked and closed state, and the locking joint 100 is in Figure 10 the second locking state shown in

[0109] Figure 11 . The push handle 10 and the linkage rod 20 in Figure 3 correspond to the closed and locked state of the frame in Figure 10 and the second locking state of the locking joint in Figure 10 and Figure 11As shown, when the locking joint 100 is in the second locking state, the two protrusions 135 of the locking member 130 are received in the two recesses 116 of the first connecting seat 110 one by one, and the blocking surface 118 is blocked by the abutment surface 139 along the expansion direction D2, thereby limiting the rotation of the push handle 10 provided with the recess 116 along the expansion direction D2 relative to the locking member 130 provided with the protrusion 135 and the linkage rod 10 along the expansion direction D2, that is, limiting the rotation of the push handle 10 relative to the linkage rod 20 along the expansion direction D2. However, since the protrusion 135 is only protruded on one side of the corresponding meshing tooth 131 in the unfolding direction D2, and is not protruded on one side of the corresponding meshing tooth 131 in the folding direction D1, and the remaining first teeth 111 are all provided with a groove 117 for receiving the protrusion 135, the first teeth 111 provided with the notch 116 can still rotate relative to the protrusion 135 along the folding direction D1, that is, the push handle 10 can still rotate relative to the linkage rod 10 and the locking member 130 along the folding direction D1. At the same time, the protrusion 135 (specifically the abutting surface 160) is also blocked by the abutting surface 119 in the axial direction I, and the protrusion 135 is restricted from further protruding into the first connecting seat 110 along the axial direction I, so that the depth of the locking member 130 extending into the first connecting seat 110 is much smaller than the depth of the locking member 130 extending into the first connecting seat 110 when the locking joint 100 is in the first locking state.

[0110] In this folded and locked state, when the push handle 10 is pushed along the unfolding direction D2, due to the small depth of the recess 116, the depth of the locking member 130 extending into the first connecting seat 110 is also small. Even if the blocking surface 118 and the abutting surface 139 abut against each other along the circumferential direction C, it will cause a certain obstruction to the movement of the push handle 10. However, since the depth of the abutment between the two is not large, as long as the push handle 10 is pivoted along the circumferential direction C, the first tooth 111 with the recess 116 can be moved along the unfolding direction D2 and the axial direction I to the outer side of the end surface of the protrusion 135 in the axial direction I (so that the locking member 130 moves toward the second connecting seat 120, And compress the spring 150, reducing the hard interference between the first tooth 111 with the recess 116 and the protrusion 135), and then pass over the protrusion 135 and move to the side of the circumferential direction C where the protrusion 135 is provided with a guide slope 138, that is, the first tooth 111 with the recess 116 abuts against the protrusion 135 along the circumferential direction C, and the protrusion 135 is separated from the recess 116. At this time, the locking joint 100 is restored to the unlocked state. If the push handle 10 is continued to be pushed along the expansion direction D2, the locking joint 100 can be restored to the first locking state, and the frame can be restored to the expanded state, so that the push handle 10 can no longer pivot relative to the linkage rod 20.

[0111] In other embodiments, the abutting surface 119 can be formed on the end surface of the first tooth 111 provided with the notch 116 in the axial direction I (i.e., on the side of the positive direction D1 of the circumferential direction C of the blocking surface 118), and the abutting surface 160 can be formed on the end surface of the engaging tooth 131 provided with the protrusion 135 in the axial direction I (i.e., on the side of the positive direction D1 of the circumferential direction C of the abutting surface 139). When the locking joint 100 is in the second locking state, the protrusion 135 is also received in the notch 116. However, the end surface of the protrusion 135 in the axial direction I does not abut against the surface of the first tooth 111 on the side of the notch 116 in the axial direction I, but the abutting surface 119 abuts against the abutting surface 160 in the axial direction I, which can also limit the engagement depth between the locking member 130 and the first connecting seat 110.

[0112] In other embodiments, two protrusions 135 can be provided on two first teeth 111, two notches 116 can be provided on two engaging teeth 131, and a plurality of grooves 117 can be provided on the remaining plurality of engaging teeth 131 and locking teeth 132, 134. By the abutment between the abutting surface 139 on the protrusion 135 and the blocking surface 118 (at this time, the blocking surface 118 is arranged on the side of the opposite direction D2 of the circumferential direction C of the protrusion 135, and the abutting surface 139 is arranged on the side of the opposite direction D2 of the circumferential direction C of the notch 116), the relative movement of the push handle 10 relative to the linkage rod 20 in the unfolding direction D2 is restricted. By the end surface of the protrusion 135 in the axial direction I (i.e., the abutting surface 160) abutting against the abutting surface 119 of the notch 116, the engagement depth between the locking member 130 and the first connecting seat 110 is restricted. Figures 12 to 18 Another embodiment of the locking joint 100 according to the present disclosure is shown. To avoid repetition, the parts of this embodiment that are the same as Figures 1 to 11 the embodiments will not be described in detail.

[0113] Figure 12 、 Figure 13 is an exploded view of the locking joint 100A according to another embodiment. Figure 14 is a perspective view of the first connecting seat 110A and the locking member 130A according to another embodiment. According to this embodiment, as Figure 12 、 Figure 13 and Figure 14As shown, the two engaging portions 135A of the locking member 130A are two convex ribs 135A, and the following description will be made with the convex ribs 135A. The two convex ribs 135A are correspondingly arranged on two engaging teeth 131A that are circumferentially spaced along the circumferential direction C, and the two engaging teeth 131A are approximately 180° apart. Specifically, the convex rib 135A axially extends from the end face of the corresponding engaging tooth 131A away from the second connecting seat 120A toward the first connecting seat 110A, and is located at the outer end of the corresponding engaging tooth 131A in the radial direction and radially protrudes from the outer end of the engaging tooth 131A in the radial direction, that is, the convex rib 135A is not continuously arranged along the radial direction on the entire end face of the corresponding engaging tooth 131A axially away from the second connecting seat 120A. Possibly, the convex rib 135A can also be arranged on the locking teeth 132A and the locking teeth 134A. The guiding inclined surface 138A, the abutting surface 139A, and the abutting surface 160A of the locking member 130A are all formed on the surface of the convex rib 135A. Specifically, the guiding inclined surface 138A is formed on the surface of the convex rib 135A on the side opposite to the circumferential direction C in the reverse direction D2, and is inclined in the radial direction and the circumferential direction C, while the abutting surface 139A is formed on the surface of the convex rib 135A on the side in the positive direction D1 of the circumferential direction C, and is also inclined in the radial direction and the circumferential direction C, that is, the abutting surface 139A is also arranged as an inclined surface, and the inclination angle of the guiding inclined surface 138A is greater than the inclination angle of the abutting surface 139A, and the abutting surface 160A is formed on the end face of the convex rib 135A in the axial direction I. Specifically, the guiding inclined surface 138A is connected to the abutting surface 139A, and an angle is formed between the guiding inclined surface 138A and the abutting surface 139A, and this angle is arranged as an obtuse angle, and both the guiding inclined surface 138A and the abutting surface 139A are parallel to the axial direction I, while the abutting surface 160A is perpendicular to the axial direction I. As Figure 14As shown, two limiting portions 116A of the first connecting seat 110A are arranged at intervals along the circumferential direction C and formed on the inner circumference of the circular accommodating portion. The two limiting portions 116A (which are set as bumps 116A and will be described below with bumps 116A) are correspondingly arranged on the first teeth 111A arranged at intervals along the circumferential direction C, and the two first teeth 111A are arranged at an interval of approximately 180°. The bump 116A protrudes from the end surface of the first tooth 111A close to the second connecting seat 120A along the axial direction I towards the second connecting seat 120A, and is arranged on one side of the corresponding first tooth 111A in the reverse direction D2 of the circumferential direction C, but not on one side of the corresponding first tooth 111A in the positive direction D1 of the circumferential direction C. That is, the bump 116A does not cover the entire corresponding first tooth 111 along the circumferential direction C, and the bump 116A extends beyond the corresponding first tooth 111A along the reverse direction D2 of the circumferential direction C, but will not extend to the adjacent first tooth 111A. And the bump 116A is arranged radially at the end of the corresponding first tooth 111A (close to the circular accommodating portion of the first connecting seat 110A), and the protruding length of the bump 116A in the axial direction I is less than or equal to the protruding length of the rib 135A in the axial direction I.

[0114] As Figure 14 shown, in this embodiment, the blocking surface 118A of the first connecting seat 110A is formed on the surface of the bump 116A on the positive direction D1 side of the circumferential direction C. The blocking surface 118A extends obliquely along the circumferential direction C and the radial direction. Specifically, the inclination angle of the blocking surface 118A is the same as that of the abutting surface 139A, and the blocking surface 118A is also parallel to the axial direction I.

[0115] As Figure 14 shown, in this embodiment, the abutting surface 119A of the first connecting seat 110A is formed on the end surface of the first tooth 111A provided with the bump 116A along the axial direction I close to the second connecting seat 120A, and is located on the positive direction D1 side of the circumferential direction C of the blocking surface 118A. The abutting surface 119A extends in a direction intersecting with the axial direction I. Specifically, the abutting surface 119A extends in a direction perpendicular to the axial direction I, and the blocking surface 118A and the abutting surface 119A are perpendicular to each other.

[0116] As Figure 14 shown, in this embodiment, in addition to the first connecting seat 110A and Figures 1 to 10In addition to the blocking surface 118A and the abutting surface 119A which are provided in accordance with the embodiments, a guiding inclined surface S is further provided. The guiding inclined surface S is formed on the side of the bump 116A opposite to the circumferential direction C in the reverse direction D2, and extends obliquely along the circumferential direction C and the radial direction. The guiding inclined surface S is used to abut and slide along the positive direction D1 of the circumferential direction C against the guiding inclined surface 138A when the locking joint 100 is in the unlocked state, so as to move the bump 116A from the side of the guiding inclined surface 138A of the rib 135A along the positive direction D1 of the circumferential direction C to the side of the abutting surface 139A of the rib 135A. Specifically, the inclination angles of the guiding inclined surface S and the guiding inclined surface 138A are the same, and at least a part of the guiding inclined surface S extends beyond the first tooth 111A along the circumferential direction C.

[0117] As Figure 14 shown, in this embodiment, in addition to the first tooth 111A of the bump 116A, on other first teeth 111A, a groove 117A is recessed from the end surface of each first tooth 111A close to the second connecting seat 120A in the axial direction I toward the side away from the second connecting seat 120A along the axial direction I. The groove 117A penetrates the corresponding entire first tooth 111A along the circumferential direction C, but does not penetrate the corresponding entire first tooth 111A along the radial direction, that is, the bottom of the groove 117A is not the end surface of the first tooth 111A closest to the second connecting seat 120A along the axial direction I. The depth of the recess of the groove 117A is equal to or greater than the protruding length of the rib 135A. The groove 117A is used to make way for the rib 135A to move along the circumferential direction C when the locking joint 100A is in the unlocked state.

[0118] As Figure 14 shown, in this embodiment, the height of the rib 135A is preferably equal to the height of the bump 116A.

[0119] Figure 15 is a cross-sectional view of the locking member 130A according to another embodiment. According to this embodiment, the locking member 130A is further provided with two recesses 137A. The two recesses 137A are respectively formed in the two meshing teeth 131A provided with the rib 135A. Each recess 137A is recessed from the end surface of the meshing tooth 131A away from the second connecting seat 120A toward the side of the second connecting seat 120A along the axial direction I, and is formed radially between the free end of the rib 135A and the corresponding meshing tooth 131A to enhance the radial elastic deformation of the rib 135A.

[0120] As Figure 16 shown, Figure 16 is a partial schematic view along the circumferential direction C of the locking joint 100A in the unlocked state according to another embodiment. The schematic view shows the tooth 131A with the rib 135A and the bump 116A on the inner circumference of the first connecting seat 110A. In Figure 6In the state shown, the frame is about to reach the folded and locked state, and the locking joint 100A is about to reach the second locked state. When the lug 116A moves further in the folding direction D1 from the Figure 16 state shown, the first guiding inclined surface 119A extending in the circumferential direction C will abut and slide against the second guiding inclined surface 138A, causing the free end of the rib 135A to elastically deform radially under the drive of the lug 116A, so as to guide the lug 116A to slide past the rib 135A in the folding direction D1. During this process, the user will feel the resistance brought to the push handle 10A due to the contact between the rib 135A and the lug 116A, indicating that the locking joint 100A is about to reach the second locked state and the frame is about to reach the locked and folded state.

[0121] Figure 17 FIG. is a perspective view of the first connecting seat 110A, the locking member 130A and the spring 150A according to another embodiment. The locking member 130A abuts against the end face of the first tooth 111A of the first connecting seat 110A by the elastic force of the spring 150A in the spring receiving portion 136A. The abutting surface 139A of the rib 135A abuts against the blocking surface 118A of the lug 116A (the rib 135A and the lug 116A are in circumferential contact), so that the rib 135A and the lug 116A are engaged to limit the pivoting of the lug 116A relative to the rib 135A in the unfolding direction D2, that is, to limit the pivoting of the push handle 10 relative to the linkage rod 20 in the unfolding direction D2. At this time, the locking joint 100A is in the second locked state and the frame is in the folded and locked state. However, at this time, since the lug 116 does not extend to the side of the corresponding first tooth 111A in the positive direction D1 of the circumferential direction C, when the first connecting seat 110A rotates in the folding direction D1, the rib 135A and the lug 116A are not affected by each other, and the push handle 10 can be further folded.

[0122] Figure 18 FIG. is a perspective view of the locking joint 100A according to another embodiment. Figure 18 The states of the components in Figure 11 correspond to Figure 17 . As shown in Figure 17 and Figure 18As shown, when the locking joint 100A is in the second locked state and the vehicle frame is in the folded and locked state, when the first connecting seat 110A rotates along the unfolding direction D2, due to the relatively large-slope abutting surface 139A and the blocking surface 118A abutting against each other, it is not easy to unfold. However, since the protruding length of the convex block 116A along the axial direction I is relatively small, and the protruding length of the convex rib 135A along the axial direction I is greater than or equal to the protruding length of the convex block 116A along the axial direction I, when the user forces the first connecting seat 110A to rotate along the unfolding direction D2, the convex block 116A can also radially drive the free end of the convex rib 135A to elastically deform radially, so as to guide the convex block 116A to slide past the convex rib 135A along the unfolding direction D2, so that the relatively large-slope abutting surface 139A and the blocking surface 118A no longer abut against each other, and the locking joint 100A returns to the unlocked state. At the same time, in the state shown in Figure 17 and Figure 18 , the abutting surface 160A of the convex rib 135A will also be blocked by the abutting surface 119A in the axial direction I, restricting the convex rib 135A from further protruding into the first connecting seat 110A along the axial direction I, so that the depth of the locking member 130A extending into the first connecting seat 110A is less than the depth of the locking member 130A extending into the first connecting seat 110A when the locking joint 100A is in the first locked state.

[0123] Since the present application can be specifically implemented in various forms without departing from the spirit and essence of the present application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted most broadly within the scope defined by the claims. Therefore, all changes falling within the scope of the claims or their equivalents should be covered by the claims.

Claims

1. A locking joint, characterized in that, Comprising: A first connecting seat; A second connecting seat, the first connecting seat and the second connecting seat can pivot relative to each other axially and circumferentially; A locking member, arranged axially between the first connecting seat and the second connecting seat and capable of moving axially relative to both and engaging with both, wherein, The first connecting seat is provided with a limiting portion extending axially, and the locking member is provided with an engaging portion extending axially, When the locking member engages with the second connecting seat and the engaging portion engages with the limiting portion, the first connecting seat can pivot relative to the second connecting seat in the positive circumferential direction, but cannot pivot relative to the second connecting seat in the reverse circumferential direction.

2. The locking joint according to claim 1, characterized in that: The inner circumference of the first connecting seat is provided with a plurality of first teeth spaced circumferentially; The inner circumference of the second connecting seat is provided with a plurality of second teeth spaced circumferentially; The outer circumference of the locking member is provided with a plurality of engaging teeth spaced circumferentially and capable of engaging with the first teeth and the second teeth; The limiting portion is arranged at the end face of the first tooth axially close to the second connecting seat, and the engaging portion is arranged at the end face of the engaging tooth axially away from the second connecting seat; The first connecting seat is further provided with a blocking surface, the blocking surface is located on one side of the limiting portion in the circumferential direction and is on the same first tooth as the limiting portion; The locking member is further provided with a abutting surface, the abutting surface is located on one side of the engaging portion in the circumferential direction and is on the same engaging tooth as the engaging portion; When the locking member engages with the second connecting seat and the engaging portion engages with the limiting portion, a plurality of the engaging teeth are engaged with a plurality of the second teeth in an alternating manner in the circumferential direction, and at least one engaging tooth is axially opposite to at least one first tooth, the blocking surface and the abutting surface are in circumferential abutment with each other, and the abutting surface is located on the reverse circumferential direction side of the blocking surface to limit the limiting portion from pivoting relative to the engaging portion in the reverse circumferential direction, except for the engaging tooth provided with the abutting surface.

3. The locking joint according to claim 2, characterized in that: The engaging portion protrudes axially from the end face of the corresponding engaging tooth away from the second connecting seat towards the first connecting seat, and the abutting surface is located on the surface of the engaging portion on the positive circumferential direction side.

4. The locking joint according to claim 3, characterized in that: The engaging portion is located on the reverse circumferential direction side of the corresponding engaging tooth and does not extend to the positive circumferential direction side of the corresponding engaging tooth; The limiting portion is recessed axially from the end face of the corresponding first tooth close to the second connecting seat towards the side away from the second connecting seat, the limiting portion is located on the reverse circumferential direction side of the corresponding engaging tooth and penetrates through the first tooth in the reverse circumferential direction, and the blocking surface is located on the positive circumferential direction side of the limiting portion; When the limiting portion and the engaging portion are engaged, at least a part of the engaging portion is embedded in the limiting portion.

5. The locking joint according to claim 4, characterized in that: Both the blocking surface and the abutting surface are parallel to the axial direction.

6. The locking joint according to claim 4, characterized in that: At least one of the first connecting seat and the locking member is provided with a guiding inclined surface, and the guiding inclined surface is used for guiding the first tooth provided with the limiting portion to cross the engaging portion along the positive direction of the circumferential direction; The guiding inclined surface is arranged on the surface of the first tooth provided with the limiting portion on the positive side in the circumferential direction, and is inclined along the axial direction and the circumferential direction; and / or, The guiding inclined surface is arranged on the surface of the engaging portion on the negative side in the circumferential direction, and is inclined along the axial direction and the circumferential direction.

7. The locking joint according to claim 4, characterized in that: The first connecting seat is further provided with an abutting surface, the abutting surface is located on one side of the blocking surface in the circumferential direction, and the abutting surface and the blocking surface are located on the same first tooth; The locking member is further provided with an abutting surface, the abutting surface is located on one side of the abutting surface in the circumferential direction, and the abutting surface and the abutting surface are located on the same tooth; When the locking member is engaged with the second connecting seat and the engaging portion is engaged with the limiting portion, the abutting surface and the abutting surface are axially abutted against each other.

8. The locking joint according to claim 7, characterized in that: The abutting surface is located on the negative side of the blocking surface in the circumferential direction and on the positive side of the limiting portion in the axial direction, and the abutting surface is located on the negative side of the abutting surface in the circumferential direction and on the positive side of the engaging portion in the axial direction; or, The abutting surface is located on the positive side of the blocking surface in the circumferential direction, and the abutting surface is located on the positive side of the abutting surface in the circumferential direction.

9. The locking joint according to claim 3, characterized in that: The engaging portion is located at the outer end of the corresponding tooth in the radial direction; The limiting portion protrudes from the end surface of the first tooth close to the second connecting seat along the axial direction towards the second connecting seat, the limiting portion is located on the negative side of the first tooth in the circumferential direction and does not extend to the positive side of the first tooth in the circumferential direction, and the blocking surface is located on the surface of the limiting portion on the positive side in the circumferential direction; When the limiting portion and the engaging portion are engaged, the engaging portion abuts against the limiting portion along the circumferential direction.

10. The locking joint according to claim 9, characterized in that: Both the blocking surface and the abutting surface are inclined along the radial direction and the circumferential direction.

11. The locking joint according to claim 10, characterized in that: At least one of the first connecting seat and the locking member is provided with a guiding inclined surface, and the guiding inclined surface is used for guiding the limiting portion to cross the engaging portion along the positive direction of the circumferential direction; The guiding inclined surface is arranged on the surface of the limiting portion on the positive side in the circumferential direction, and is inclined along the radial direction and the circumferential direction; and / or, The guiding inclined surface is provided on the surface on the side opposite to the circumferential direction of the engaging portion, and is inclined along the radial direction and the circumferential direction.

12. The locking joint according to claim 11, characterized in that: The inclination angle of the abutting surface is greater than the inclination angle of the guiding inclined surface.

13. The locking joint according to claim 9, characterized in that: The locking member is provided with a recess, the recess is recessed axially from the end surface of the tooth having the engaging portion away from the second connecting seat toward the second connecting seat, and is formed radially between the engaging portion and the corresponding tooth.

14. The locking joint according to claim 9, characterized in that: The first connecting seat is further provided with a stopping surface, the stopping surface is located on the end surface of the first tooth provided with the limiting portion close to the second connecting seat in the axial direction and on the side in the positive circumferential direction of the blocking surface; The locking member is further provided with an abutting surface, the abutting surface is located on the end surface of the engaging portion away from the second connecting seat in the axial direction; When the locking member is engaged with the second connecting seat and the engaging portion is engaged with the limiting portion, the stopping surface and the abutting surface abut against each other axially.

15. The locking joint according to claim 3, characterized in that: Except for the first tooth provided with the limiting portion, each of the other first teeth has a groove, the groove is recessed axially from the end surface of the corresponding first tooth close to the second connecting seat toward the side away from the second connecting seat, the groove penetrates the corresponding first tooth in the circumferential direction, and the groove is used to axially receive the engaging portion.

16. The locking joint according to claim 15, characterized in that: The depth of the groove is greater than or equal to the length of the engaging portion.

17. The locking joint according to claim 2, characterized in that: The limiting portion protrudes axially from the end surface of the corresponding first tooth close to the second connecting seat toward the second connecting seat, and the blocking surface is located on the surface on the side opposite to the circumferential direction of the limiting portion; The engaging portion is recessed from the end surface of the corresponding tooth away from the second connecting seat toward the second connecting seat, the abutting surface is located on the side opposite to the circumferential direction of the engaging portion, and the engaging portion penetrates the tooth in the positive circumferential direction; Except for the tooth provided with the engaging portion, each of the other teeth has a groove, the groove is recessed axially from the end surface of the corresponding tooth away from the second connecting seat toward the second connecting seat, the groove penetrates the corresponding tooth in the circumferential direction, and the groove is used to axially receive the limiting portion.

18. The locking joint according to any one of claims 2 to 17, characterized in that: Two limiting portions are provided on the first connecting seat, the two limiting portions are respectively provided on two first teeth, two engaging portions are provided on the second connecting seat, and the two engaging portions are respectively provided on two teeth.

19. The locking joint according to any one of claims 1 to 17, characterized in that: The locking joint includes a driving member, the driving member being axially located between the first connecting seat and the locking member to drive the locking member to move towards the second connecting seat.

20. The locking joint according to any one of claims 1 to 17, characterized in that: The locking joint includes an elastic member, the elastic member being axially located between the second connecting seat and the locking member to urge the locking member to move towards the first connecting seat.

21. A children's vehicle, characterized in that, The child carrier includes: A frame; and The locking joint according to any one of claims 1 to 20, wherein The frame includes a push handle and a linkage rod pivotally connected to the push handle through the locking joint, the push handle is connected to the first connecting seat, the linkage rod is connected to the second connecting seat, the push handle pivots towards the linkage rod in the positive circumferential direction to achieve the folding between the push handle and the linkage rod, and the push handle pivots away from the linkage rod in the reverse circumferential direction to achieve the unfolding between the push handle and the linkage rod.

22. A children's vehicle, characterized in that, The child carrier includes: A frame; and The locking joint according to claim 19, wherein The frame includes a push handle and a linkage rod pivotally connected to the push handle through the locking joint, the push handle is connected to the first connecting seat, the linkage rod is connected to the second connecting seat, the push handle pivots towards the linkage rod in the positive circumferential direction to achieve the folding between the push handle and the linkage rod, and the push handle pivots away from the linkage rod in the reverse circumferential direction to achieve the unfolding between the push handle and the linkage rod; The push handle has an operating member connected to the driving member, and the operating member is operated to drive the locking member to move towards the second connecting seat, so that the locking member engages with the second connecting seat and the first connecting seat can pivot relative to the second connecting seat.

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