Lock joint and child carrier

Abstract

To provide a lock joint and child carrier.SOLUTION: The present disclosure provides a lock joint including a first connection seat, second connection seat, and lock member. The first connection seat and second connection seat can pivot on each other about an axial direction and in a circumferential direction. The lock member is interposed between the first connection seat and second connection seat in the axial direction and can be joined to both the connection seats movably in the axial direction. The first connection seat has a position limitation part that extends in a direction parallel to the axial direction. The lock member has an engagement part that extends in the direction parallel to the axial direction. When the lock member is engaged with the second connection seat and the engagement part is fitted into the position limitation part, the first connection seat can pivot on the second connection seat in a forward direction of the circumferential direction but cannot pivot on the second connection seat in a reverse direction of the circumferential direction.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present disclosure relates to a locking joint and a child carrier.

Background Art

[0002] Currently, for example, child carriers such as baby strollers all have a folding and storage function, which is convenient for carrying and using when going out. Many folding locks prevent the frame from accidentally unfolding after being folded by installing a folding hook structure. However, for a general folding hook, the lock cannot be released unless the unlocking member is manually operated when unlocking, and in particular, it is impossible to achieve unfolding with one hand, and the operation is inconvenient. In addition, if a folding hook structure is provided on the frame, the overall frame is not beautiful.

Summary of the Invention

[0003] According to the present disclosure, the locking joint includes a first connection seat, a second connection seat, and a locking member. The first connection seat and the second connection seat are pivotable relative to each other around the axial direction and along the circumferential direction. The locking member is provided between the first connection seat and the second connection seat along the axial direction and can engage with both of them so as to be movable axially relative to both of them. The first connection seat is provided with a position limiting portion extending along a direction parallel to the axial direction, and the locking member is provided with an engaging portion extending along a direction parallel to the axial direction. When the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the first connection seat is pivotable relative to the second connection seat along the positive direction of the circumferential direction, but is not pivotable relative to the second connection seat in the reverse direction of the circumferential direction.

[0004] In one embodiment, a plurality of first teeth are provided on the inner circumference of the first connection seat at intervals along the circumferential direction, a plurality of second teeth are provided on the inner circumference of the second connection seat at intervals along the circumferential direction, and a plurality of latch teeth are provided on the outer circumference of the lock member at intervals along the circumferential direction and engageable with the first teeth and the second teeth. The position limiting portion is provided on the end face closer to the second connection seat in the direction parallel to the axial direction of the first teeth. The engaging portion is provided on the end face of the latch tooth away from the second connection seat in the direction parallel to the axial direction. A blocking surface is further provided on the first connection seat. The blocking surface is located on one side in the circumferential direction of the position limiting portion and on the same first tooth as the position limiting portion. The lock member is further provided with an aiming surface located on one side in the circumferential direction of the engaging portion and on the same latch tooth as the engaging portion. When the lock member engages with the second connection seat and the engaging portion engages with the position limiting portion, the plurality of latch teeth engage alternately with the plurality of second teeth along the circumferential direction, and at least one latch tooth faces at least one first tooth along a direction parallel to the axial direction. The blocking surface and the aiming surface abut against each other along the circumferential direction, and the aiming surface is located on one side in the opposite direction of the circumferential direction of the blocking surface, so as to limit the pivot of the position limiting portion in the opposite direction of the circumferential direction with respect to the engaging portion.

[0005] In one embodiment, the engaging portion is formed to protrude toward the first connection seat from the end face of the corresponding latch tooth away from the second connection seat along the direction parallel to the axial direction, and the aiming surface is located on the surface on the positive direction side in the circumferential direction of the engaging portion.

[0006] In one embodiment, the engaging portion is located on one side in the reverse circumferential direction of the corresponding latch tooth and does not extend to one side in the forward circumferential direction of the corresponding latch tooth. The position limiting portion is recessed from the end face near the second connection seat of the corresponding first tooth along a direction parallel to the axial direction toward the side away from the second connection seat. The position limiting portion is located on the reverse circumferential direction side of the corresponding first tooth and penetrates the corresponding first tooth along the reverse circumferential direction. The blocking surface is located on one side in the forward circumferential direction of the position limiting portion. When the position limiting portion and the engaging portion are engaged, the engaging portion is at least partially fitted into the position 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 connection seat and the locking member is provided with a guide slope for guiding the first tooth provided with the position limiting portion to cross over the engaging portion along the forward circumferential direction. The guide slope is provided on the surface on the forward circumferential direction side of the first tooth provided with the position limiting portion and is inclined along a direction parallel to the axial direction and the circumferential direction, and / or the guide slope is provided on the surface on the reverse circumferential direction side of the engaging portion and is inclined along a direction parallel to the axial direction and the circumferential direction.

[0009] In one embodiment, the first connection seat is further provided with an abutting surface. The abutting surface is located on one side in the circumferential direction 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 a contact surface located on one side in the circumferential direction of the abutting surface. The contact surface and the abutting surface are located on the same latch tooth. When the locking member is engaged with the second connection seat and the engaging portion is engaged with the position limiting portion, the abutting surface and the contact surface are in contact with each other along a direction parallel to the axial direction.

[0010] In one embodiment, the abutting surface is located on the opposite side in the circumferential direction of the blocking surface and on one side in the direction parallel to the axial direction of the position limiting portion, the contact surface is located on the opposite side in the circumferential direction of the applying surface and on one side in the direction parallel to the axial direction of the engaging portion, or the abutting surface is located on one side in the positive circumferential direction of the blocking surface, and the contact surface is located on one side in the positive circumferential direction of the applying surface.

[0011] In one embodiment, the engaging portion is located at the radially outer end of the corresponding latch tooth, the position limiting portion is formed to protrude from the end surface near the second connection seat of the corresponding first tooth along the direction parallel to the axial direction towards the second connection seat, the position limiting portion is located on one side in the positive circumferential direction of the corresponding first tooth and does not extend to one side in the reverse circumferential direction of the corresponding first tooth, the blocking surface is located on the surface on the reverse circumferential side of the position limiting portion, and when the position limiting portion and the engaging portion are engaged, the engaging portion is in contact with the position limiting portion along the circumferential direction.

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

[0013] In one embodiment, at least one of the first connection seat and the lock member is provided with a guide slope for guiding the position limiting portion to cross over the engaging portion along the positive circumferential direction. The guide slope is provided on the surface on the positive circumferential side of the position limiting portion, is inclined in the radial direction and the circumferential direction, and / or the guide slope is provided on the surface on the reverse circumferential side of the engaging portion and is inclined in the radial direction and the circumferential direction.

[0014] In one embodiment, the inclination angle of the applying surface is larger than the inclination angle of the guide slope.

[0015] In one embodiment, the lock member is provided with a recess. The recess is formed to be recessed from the end surface away from the second connection seat of the latch tooth provided with the engaging portion along the direction parallel to the axial direction towards the second connection seat, and is formed between the engaging portion and the corresponding latch tooth along the radial direction.

[0016] In one embodiment, on the first connection seat, there is a contact surface located on the end surface closer to the second connection seat in the direction parallel to the axial direction of the first tooth provided with the position limiting portion, and located on one side in the reverse direction of the circumferential direction of the blocking surface. Further, on the locking member, there is a contact surface located on the end surface away from the second connection seat in the direction parallel to the axial direction of the engaging portion. When the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the contact surface and the contact surface abut against each other along the direction parallel to the axial direction.

[0017] In one embodiment, in addition to the first tooth provided with the position limiting portion, each of the remaining first teeth is provided with a concave groove. The concave groove is recessed from the end surface closer to the second connection seat of the corresponding first tooth along the direction parallel to the axial direction towards the side away from the second connection seat. The concave groove penetrates the corresponding first tooth in the circumferential direction, and the concave groove is configured to accommodate the engaging portion along the direction parallel to the axial direction.

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

[0019] In one embodiment, the position limiting portion is formed to protrude from the end surface closer to the second connection seat of the corresponding first tooth along the direction parallel to the axial direction towards the second connection seat. The blocking surface is located on the surface on the reverse side of the circumferential direction of the position limiting portion. The engaging portion is formed to be recessed from the end surface away from the second connection seat of the corresponding latch tooth towards the second connection seat. The contact surface is located on one side in the reverse direction of the circumferential direction of the engaging portion. The engaging portion penetrates the latch tooth along the positive direction of the circumferential direction. In addition to the latch tooth provided with the engaging portion, each of the remaining latch teeth is provided with a concave groove. The concave groove is recessed from the end surface away from the second connection seat of the corresponding latch tooth along the direction parallel to the axial direction towards the second connection seat. The concave groove penetrates the corresponding latch tooth in the circumferential direction, and the concave groove is configured to accommodate the position limiting portion along the direction parallel to the axial direction.

[0020] In one embodiment, two position limiting parts are provided on the first connection seat, the two position limiting parts are respectively provided on two first pins, two engaging parts are provided on the second connection seat, and the two engaging parts are respectively provided on two latch teeth.

[0021] In one embodiment, the locking joint is located axially between the first connection seat and the locking member, and includes a driving member that drives the locking member to move towards the second connection seat.

[0022] In one embodiment, the locking joint is located axially between the second connection seat and the locking member, and includes an elastic member that drives the locking member to move towards the first connection seat.

[0023] According to the present disclosure, a child carrier is provided, the child carrier includes a frame and the locking joint according to the present disclosure, the frame includes a handle and an interlocking rod pivotally attached to the handle via the locking joint, the handle is connected to the first connection seat, the interlocking rod is connected to the second connection seat, and when the handle pivots along the positive circumferential direction towards the interlocking rod, folding between the handle and the interlocking rod is realized, and when the handle pivots along the reverse circumferential direction away from the interlocking rod, unfolding between the handle and the interlocking rod is realized.

[0024] According to the present disclosure, a child carrier is provided. The child carrier includes a frame and a locking joint according to the present disclosure. The frame includes a handle and an interlocking rod pivotally attached to the handle via the locking joint. The handle is connected to a first connection seat, and the interlocking rod is connected to a second connection seat. When the handle pivots toward the interlocking rod along the positive circumferential direction, folding between the handle and the interlocking rod is realized. When the handle pivots away from the interlocking rod along the reverse circumferential direction, unfolding between the handle and the interlocking rod is realized. The handle has an operating member connected to a driving member. The operating member is operated to drive the locking member to move toward the second connection seat such that the locking member engages with the second connection seat and the first connection seat is pivotable relative to the second connection seat.

Brief Description of the Drawings

[0025]

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Best Mode for Carrying Out the Invention

[0026] Although the present invention has been illustrated and described with reference to specific embodiments, the present invention should not be limited to the illustrated details. Rather, various changes can be made to these details without departing from the scope of equivalent embodiments of the patent application.

[0027] The descriptions of directions such as "front", "rear", "upper", "lower", etc. in this text are only for ease of understanding, and the present invention is not limited to these directions. Depending on the actual situation, typical embodiments are referred to and the present application is listed and described, but the terms used are not limiting and are for explanation and illustration.

[0028] FIG. 1 is a side view of the child carrier 1 according to the present disclosure in a deployed state. The child carrier 1 is, for example, a baby stroller and has a frame. The frame includes a handle 10, an interlocking rod 20, a handlebar 30, a front leg assembly 40, a rear leg assembly 50, a seat assembly 60, and a handrail 70. The front leg assembly 40, the rear leg assembly 50, and the handlebar 30 are pivotally attached to each other via a frame joint 200. The handlebar 30 is pivotally attached to the handle 10. The handle 10 is pivotally attached to the interlocking rod 20 via a lock joint 100. The other end of the interlocking rod 20 is pivotally attached to the rear leg assembly 50. The lock joint 100 has a first locked state, a second locked state, and an unlocked state. When the lock joint 100 is in the first locked state, the handle 10 cannot pivot with respect to the interlocking rod 20, and the two are in a locked state. When the lock joint 100 is in the second locked state, the handle 10 can pivot only in the positive direction of the pivoting direction with respect to the interlocking rod 20 and cannot rotate in the reverse direction of the pivoting direction with respect to the interlocking rod 20. When the lock joint 100 is in the unlocked state, the handle 10 can pivot in both the positive and reverse directions of the pivoting direction with respect to the interlocking rod 20. According to the present disclosure, when the frame is in the deployed state, the lock joint 100 is in the first locked state, so that the handle 10 and the interlocking rod 20 are relatively fixed, avoiding accidental folding. At this time, the child can ride on the frame, and the user can push the frame. As shown in FIG. 3 below, when the frame is in the folded and locked state, the lock joint 100 is in the second locked state, so that the handle 10 can pivot with respect to the interlocking rod 20 only in the direction approaching the interlocking rod 20 (corresponding to the positive direction of the pivoting direction, that is, the folding direction D1), but the handle 10 cannot pivot with respect to the interlocking rod 20 in the direction away from the interlocking rod 20 (corresponding to the reverse direction of the pivoting direction, that is, the deployment direction D2).In the process where the frame is switched from the deployed state to the folded state, the lock joint 100 is in the unlocked state. At this time, the handle 10 can pivot with respect to the linkage rod 20 in a direction approaching the linkage rod 20, or can pivot with respect to the linkage rod 20 in a direction away from the linkage rod 20.

[0029] FIG. 2 is a front perspective view of the frame of the child carrier 1 according to the present disclosure in an unfolded state. As is apparent from FIG. 2, the connection relationships of the handle 10, the linkage rod 20, the handle bar 30, the front leg assembly 40, the rear leg assembly 50, the seat assembly 60, and the handrail 70 can be understood. An operation member 11 is provided on the handle 10. For example, the operation member 11 is provided on the horizontal bar at the tip of the handle 10. For example, the operation member 11 is a button. The operation member 11 is connected to the lock joint 100 to release the first locked state of the lock joint 100 and switch the lock joint 100 from the first locked state to the unlocked state. For example, the operation member 11 is connected to the lock joint 100 via a traction member (such as a rope, a cable, etc.) extending inside the handle 10. It can be understood that by the traction member, when the operation member 11 moves, some members of the lock joint 100 can be moved to switch the state of the lock joint 100. According to this embodiment, when the operation member 11 is operated, for example, when the operation member 11 is pressed, the lock joint 100b is switched from the first locked state to the unlocked state, so that the handle 10 can be pivoted with respect to the linkage rod 20 in a direction approaching the linkage rod 20, that is, the handle 10 of the frame originally in the unfolded state can be pivoted to the side approaching the linkage rod 20 to fold the handle 10 toward the linkage rod 20. Specifically, as shown in FIG. 2, the handle 10 can be pushed toward the linkage rod 20 and rotated counterclockwise with respect to the linkage rod 20 with the lock joint 100 as a fulcrum, so that the linkage rod 20, the handle bar 30, the front leg assembly 40, and the rear leg assembly 50 are folded with each other. For the folded locked state after folding, refer to FIG. 3. At this time, the user can lift the entire child carrier 1 using the handrail 70, thereby facilitating carrying and storage. In the process of switching the frame from the unfolded state in FIG. 2 to the folded locked state in FIG. 3, the handle 10 can be pivoted with respect to the linkage rod 20 in a direction approaching the linkage rod 20, or can also be pivoted with respect to the linkage rod 20 in a direction away from the linkage rod 20.

[0030] FIG. 4 is an exploded view of a locking joint 100 according to an embodiment. According to this embodiment, the locking joint 100 has a first connection seat 110, a second connection seat 120, a locking member 130, a driving member 140, and an elastic member 150 provided along the axial direction I. The first connection seat 110 is fixedly connected to the handle 10, the second connection 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 connection seat 110 and the second connection seat 120. Here, the first connection seat 110 is pivotable relative to the second connection seat 120 along the circumferential direction C around the axial direction I. As can be seen from this, the circumferential direction C is provided around the axial direction I, among which the circumferential direction C corresponds to the pivoting direction, the positive direction of the circumferential direction C corresponds to the folding direction D1, and the reverse direction of the circumferential direction C corresponds to the unfolding direction D2.

[0031] FIG. 7 is a perspective view of the locking member 130 in FIG. 4 after being inverted. As shown in FIGS. 4 and 7, the locking member 130 is similar to an annular gear, and its outer periphery has a plurality of latch teeth 131 distributed at equal intervals along the circumferential direction C. Among them, the plurality of latch teeth include a plurality of meshing latch teeth 131, and two locking latch teeth 132 and 134 provided between two adjacent meshing latch teeth 131 among the plurality of meshing latch teeth 131 and spaced apart from the meshing latch teeth 131. The locking member 130 further includes a circular through hole 133 penetrating the locking member 130 along the axial direction I. The two locking latch teeth 132 and 134 are provided at intervals along the radial direction, that is, the centers of the two locking latch teeth 132 and 134 are provided opposite to each other at 180°, and the shapes of the two locking latch teeth 132 and 134 are different. According to the present disclosure, only one locking latch tooth 132 or 134 may be provided, or the two locking latch teeth 132 and 134 may not be provided opposite to each other along the radial direction, that is, the centers of the two locking latch teeth 132 and 134 are not provided opposite to each other at 180° and may be provided at an angle between 0° and 180°, but 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.

[0032] The elastic member 150 (for example, a compression spring in a spring, hereinafter, the spring 150 will be described as an example) is provided between the second connection seat 120 and the lock member 130 to apply a driving force for causing the lock member 130 to enter the first connection seat 110.

[0033] The driving member 140 has a long perforation 141 and a driving portion 142. The upper end thereof is connected to the operating member 11 through, for example, a traction member extending to the handle 10. The long perforation 141 penetrates the driving member along the axial direction I, and the long perforation 141 extends along the radial direction. The driving portions 142 are provided on both opposite sides of the long perforation 141 so as to slip-engage with a slope-shaped driving portion 113 (see later and FIG. 5) at the first connection seat 110, and extend along a direction parallel to the radial direction and a direction parallel to the axial direction I to present a slope shape.

[0034] The second connection seat 120 is provided with a circular accommodation portion, which has locking portions 122 and 123 provided at intervals along the radial direction on its inner circumference, and a plurality of second teeth 121 arranged at equal intervals along the circumferential direction C between the locking portion 122 and the locking portion 123. When the lock member 130 enters the circular accommodation portion of the second connection seat 120, the meshing latch teeth 131 of the lock member 130 are alternately provided with the second teeth 121 of the second connection seat 120 along the circumferential direction C, and the locking latch teeth 132 and 134 of the lock member 130 are accommodated in a one-to-one correspondence with the locking portions 122 and 123 along a direction parallel to the axial direction I. At this time, the lock member 130 becomes non-rotatable along the circumferential direction C with respect to the second connection seat 120. Since the shapes of the locking latch teeth 132 and the locking latch teeth 134 are different, the locking portions 122 and the locking portions 123 also have different shapes accordingly, so that the locking latch teeth 132 are not engaged with the incompatible locking portion 123, and the locking latch teeth 134 are not engaged with the incompatible locking portion 122. As a result, the lock member 130 can enter the circular accommodation portion of the second connection seat 120 only at a specific position. The bottom of the second connection seat 120 is configured to support the spring 150 along a direction parallel to the axial direction I.

[0035] FIG. 5 is an exploded view of the lock joint 100 according to an embodiment. Since FIG. 5 has a viewing angle opposite to that of FIG. 4, the internal structure of the first connection seat 110 can be seen. FIG. 6 is a perspective view of the first connection seat 110 of FIG. 5. The first connection seat 110 is also provided with a circular accommodation portion corresponding to the second connection seat 120, and on its inner circumference, there are also provided a locking portion 114 and a locking portion 115 provided at intervals along the radial direction, and a plurality of first teeth 111 arranged at equal intervals along the circumferential direction C between the locking portion 114 and the locking portion 115. The number and arrangement method 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 latch teeth 131 of the locking member 130 are alternately provided with the first teeth 111 of the first connection seat 110 along the circumferential direction C, and the locking latch teeth 132, 134 of the locking member 130 move along a direction parallel to the axial direction I and are accommodated in a one-to-one correspondence with the two locking portions 115, 114 (see FIG. 5). At this time, the locking member 130 becomes non-rotatable relative to the first connection seat 110 along the circumferential direction C. Similarly, the locking portion 114 and the locking portion 115 have different shapes so that they can accommodate the locking latch teeth 134, 132 in a one-to-one correspondence along a direction parallel to the axial direction I, so that the locking member 130 can enter the circular accommodation portion of the first connection seat 110 only at a specific position.

[0036] At the center of the bottom of the first connection seat 110, a pin shaft 112 is provided which extends along a direction parallel to the axial direction I toward the second connection seat 120. The other end of the pin shaft 112 extends to the second connection seat 120 in a state where the first connection seat 110 and the second connection seat 120 are assembled. The shape and size of the circular through hole 133 of the locking member 130 are adapted to the pin shaft 112, so that the locking member 130 can be rotated around the pin shaft 112.

[0037] At the bottom of the first connection seat 110, a slope-shaped driving part 113 is further provided. The shape of the driving part 113 corresponds to the slope-shaped driving part 142 of the driving member 140. Moreover, on both the driving part 113 of the first connection seat 110 and the driving part 142 of the driving member 140, inclined surfaces that contact each other along a direction parallel to the axial direction I are provided. Both of the inclined surfaces of the two are inclined in a direction parallel to the axial direction I and a direction parallel to the radial direction, and are parallel to each other. Further, the pin shaft 112 penetrates the long through-hole 141 of the driving member 140 along a direction parallel to the axial direction I, and the width of the long through-hole 141 in the radial direction is larger than the width of the pin shaft 112 in the radial direction. Thereby, the driving member 140 can move relative to the pin shaft 112 along the radial direction by the long through-hole 141. For example, when the operating member 11 pulls the driving member 140 in the radial direction (upward as shown in FIGS. 4 and 5) via the traction member, since the inclined surface of the slope-shaped driving part 113 is inclined along a direction parallel to the radial direction and a direction parallel to the axial direction I, the driving member 140, while moving along the radial direction, can also translate the locking member 130 adjacent to the axial direction I away from the first connection seat 110 along the axial direction I, and can compress the spring 150.

[0038] According to this embodiment, the first connection seat 110 includes two position limiting portions 116. The two position limiting portions 116 (for example, notches 116, hereinafter, the notches 116 will be described as an example) are provided corresponding one-to-one to two first teeth 111 provided at intervals along the circumferential direction C. The two first teeth 111 are provided at an interval of approximately 180°. Optionally, the first connection seat 110 may include only one position limiting portion 116 provided on one first tooth 111. The notch 116 is recessed from the end face of the corresponding first tooth 111 near the second connection seat 120 along a direction parallel to the axial direction I toward the side away from the second connection seat 120, and is provided on one side in the reverse direction along the circumferential direction C of the corresponding first tooth 111, that is, on the side of the unfolding direction D2. Further, it penetrates the first tooth 111 along the reverse 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, since the notch 116 does not penetrate the entire corresponding first tooth 111 along the circumferential direction C, a blocking surface 118 located on one side in the positive direction D1 of the circumferential direction C of the notch 116 and a contact surface 119 located on the notch 116 side along a direction parallel to the axial direction I are formed on the first connection seat 110. Specifically, the blocking surface 118 extends along a direction parallel to the axial direction I, and the contact surface 119 extends along a direction intersecting the axial direction I. For example, the contact surface 119 is parallel to a direction perpendicular to the axial direction I, that is, the blocking surface 118 and the contact surface 119 are perpendicular to each other.

[0039] In addition to the first tooth 111 provided with the notch 116, in the remaining first teeth 111, from the end face near the second connection seat 120 in the direction parallel to the axial direction I of each first tooth 111, a concave groove 117 is recessed and formed along the direction parallel to the axial direction I toward the side away from the second connection seat 120. The concave groove 117 penetrates the entire corresponding first tooth 111 along the circumferential direction C, but does not penetrate the entire corresponding first tooth 111 along the radial direction. That is, the groove bottom of the concave groove 117 is not the end face where the first tooth 111 is closest to the second connection seat 120 along the direction parallel to the axial direction I, and the depth of the recess of the concave groove 117 is equal to or greater than the protruding length of the protrusion 135 (described below).

[0040] The angle at which the lock member 130 shown in FIG. 7 is located is the back surface after reversing the angle at which the first connection seat 110 shown in FIG. 6 is located. According to this embodiment, two engaging portions 135 are further provided on the lock member 130, and the two engaging portions 135 are configured to be received in the two notches 116 of the first connection seat 110 when the lock joint 100 is in the second locked state. The two engaging portions 135 (for example, protrusions 135, hereinafter, the protrusions 135 will be described as an example) are provided in one-to-one correspondence with two meshing latch teeth 131 provided at intervals along the circumferential direction C, and the two meshing latch teeth 131 are provided at approximately 180° intervals. Optionally, the lock member 130 may include only one engaging portion 135 provided on one meshing latch tooth 131. Specifically, the protrusion 135 is formed to protrude from the end surface of the corresponding meshing latch tooth 131 away from the second connection seat 120 along a direction parallel to the axial direction I toward the first connection seat 110, and is provided on the side of the reverse direction D2 of the circumferential direction C of the corresponding meshing latch tooth 131, but is not provided on one side of the positive direction D1 of the circumferential direction C of the corresponding meshing latch tooth 131, that is, the protrusion 135 is not continuously provided on the entire end surface away from the second connection seat 120 in the direction parallel to the axial direction I of the corresponding meshing latch tooth 131 along the circumferential direction C. In other words, the cross section of the protrusion 135 is smaller than the cross section of the corresponding meshing latch tooth 131. The lock member 130 further has a guide slope 138, an abutting surface 139, and a contact surface 160, and the guide slope 138, the abutting surface 139, and the contact surface 160 are all formed on the surface of the protrusion 135. Specifically, the guide slope 138 is formed on the surface of the protrusion 135 on the reverse direction D2 side of the circumferential direction C, and is inclined along the direction parallel to the axial direction I and the circumferential direction C. The abutting surface 139 is formed on the surface of the protrusion 135 on the positive direction D1 side of the circumferential direction C, and extends along the direction parallel to the axial direction I. The contact surface 160 is formed on the end surface of the protrusion 135 in the direction parallel to the axial direction I. Specifically, the guide slope 138 is an arc surface inclined with respect to the direction parallel to the axial direction I and the circumferential direction C. The abutting surface 139 is parallel to the axial direction I, and the contact surface 160 extends along the direction perpendicular to the axial direction I, and the guide slope 138, the contact surface 160, and the abutting surface 139 are connected in sequence.Here, the guide slope 138 is for guiding the first tooth 111 provided with the notch 116 to slide to the end face in the direction parallel to the axial direction I of the protrusion 135 along the positive direction D1 of the circumferential direction C. The abutment surface 139 is for abutting against the blocking surface 118 along the positive direction D1 of the circumferential direction C so as to limit the first tooth 111 provided with the notch 116 from climbing over the protrusion 135 along the reverse direction D2 of the circumferential direction C. The abutting surface 160 abuts against the stop surface 119 along the direction parallel to the axial direction I, thereby limiting the depth at which the protrusion 135 is inserted into the first connection seat 110. Further, it limits the depth at which the locking member 130 is inserted into the first connection seat 110. According to the present disclosure, the protrusion 135 may be provided on the locking latch teeth 132 and 134. According to the present disclosure, the guide slope 138 may be provided on the surface of the first tooth 111 provided with the notch 116 instead of on the surface of the protrusion 135. Specifically, it is provided on one side in the positive direction D1 of the circumferential direction C of the first tooth 111 so as to guide the first tooth 111 to slide to the end face in the direction parallel to the axial direction I of the protrusion 135 along the positive direction D1 of the circumferential direction C. Alternatively, the guide slope 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.

[0041] The operation of the locking joint 100 according to the present disclosure will be described with reference to FIGS. 8 to 11. FIG. 8 is a cross-sectional view of the locking joint 100 when the frame according to an embodiment is in the deployed state. FIG. 10 is a cross-sectional view of the locking joint 100 when the frame according to an embodiment is in the folded and locked state.

[0042] In Fig. 8, the locking joint 100 is in the first locked state, corresponding to the states of Figs. 1 and 2. The handle 10 and the linkage rod 20 are substantially in a straight line, and the frame is locked in the deployed state. At this time, the locking latch teeth 132 and 134 of the locking member 130 are simultaneously received in the locking portions 115, 114 (see Fig. 6) of the first connection seat 110 and the locking portions 122, 123 (see Fig. 4) of the second connection seat 120 along a direction parallel to the axial direction I. Also, the meshing latch teeth 131 (see Fig. 7) of the locking member 130 are simultaneously alternately arranged with the first tooth 111 (see Fig. 6) and the second tooth 121 (see Fig. 4) along the circumferential direction C. That is, the meshing latch teeth 131, the locking latch teeth 132, and the locking latch teeth 134 are simultaneously engaged with the first tooth 111 and the second tooth 121 along the circumferential direction C, and the first tooth 111 and the second tooth 121 are provided to face each other along a direction parallel to the axial direction I, so that both the handle 10 and the linkage rod 20 cannot pivot with respect to the locking member 130, that is, both the handle 10 and the linkage rod 20 are relatively non-pivotable, avoiding the handle 10 being unexpectedly folded with respect to the linkage rod 20 when the frame is in the deployed state. Also, the protrusion 135 provided on the meshing latch teeth 131 is also located between the two first teeth 111 along the circumferential direction C in this case. The notch 116 is provided on the first tooth 111, and the protrusion 135 and the notch 116 are provided side by side along the circumferential direction C, and it can be seen that the protrusion 135 is installed farther from the second connection seat 120 than the notch 116 along a direction parallel to the axial direction I.

[0043] In this case, the drive member 140 is not operated, and the pin shaft 112 of the first connection seat 110 abuts against one end (the upper end in Fig. 8) of the long perforation 141 of the drive member 140. The spring 150 between the second connection seat 120 and the locking member 130 applies a pressing force to the locking member 130 in the spring receiving portion 136 of the locking member 130, whereby the other side of the locking member 130 is directed toward the drive member 140, and the drive member 140 is directed toward the first connection seat 110.

[0044] In FIG. 10, the lock joint 100 is in the second locked state, corresponding to the state of FIG. 3, the handle 10 and the linkage rod 20 are folded, and the frame is in the folded locked state. To achieve this state, the user can press the operating member 111 shown in FIG. 2 to remotely operate the driving member 140 (for example, as shown in FIG. 8, pull up the driving member 140), and the driving member 140 thereby applies a pressing force towards the second connection seat 120 to the locking member 130 to compress the spring 150, so that the locking member 130 moves away from the first connection seat 110 along the axial direction I, and the meshing latch teeth 131, locking latch teeth 132, 134 of the locking member 130 are alternately engaged with the second teeth 121 of the second connection seat 120 along the circumferential direction C to release the engagement with the first teeth 111 of the first connection seat 110, and the locking latch teeth 132, 134 of the locking member 130 are received only in the locking parts 122, 123 of the second connection seat 120 and disengage from the locking parts 115, 114 of the first connection seat 110 along a direction parallel to the axial direction I, but the two protrusions 135 are still received in the first connection seat 110. At this time, the locking member 130 is still non-rotatable relative to the second connection seat 120, that is, the locking member 130 and the second connection seat 120 are relatively fixed. Thereby, the first connection seat 110 can rotate along with the pushing of the handle 10 in the folding direction D1 with respect to the linkage rod 20 and the locking member 130 provided with the second connection seat 120, whereby the handle 10 and the linkage rod 20 can be folded with respect to each other.After the handle 10 starts to rotate along the folding direction D1, the lock joint 100 is in the unlocked state, and the user can release the operating member 11. In this case, after the first connection seat 110 and the second connection seat 120 rotate relative to each other, the lock latch teeth 132, 134 are displaced from each other in the circumferential direction C without facing the lock portions 115, 114 along the direction parallel to the axial direction I. That is, the lock latch teeth 132, 134 cannot be accommodated in the lock portions 115, 114 again along the direction parallel to the axial direction I by the elastic force of the spring 150, and the lock latch teeth 132, 134 can contact the first tooth 111 along the direction parallel to the axial direction I only by the elastic force of the spring 150. Specifically, the lock latch teeth 132, 134 contact the end face of the first tooth 111 along the direction parallel to the axial direction I, and the partial meshing latch teeth 131 also contact the end face of the first tooth 111 along the direction parallel to the axial direction I. Each protrusion 135 moves into a plurality of concave grooves 117 along the circumferential direction C or is located between two first teeth 111 along the circumferential direction C, but is not blocked by the first tooth 111 in the circumferential direction C. The drive member 140 is disengaged from the lock member 130 and is applied only to the first connection seat 110, and is installed at a distance from the lock member 130 along the axial direction I. In this process, as shown in FIG. 9, the relative rotation between the first connection seat 110 and the second connection seat 120 is not blocked at all in the circumferential direction C until the first tooth 111 provided with the notch 116 moves to one side of the protrusion 135 along the folding direction D1.

[0045] FIG. 9 is a partial cross-sectional view along the circumferential direction in which the lock joint 100 is in the unlocked state. The schematic diagram shows that the latch tooth 131 provided with the protrusion 135 and the first tooth 111 provided with the notch 116 cut the lock joint 100 (the two first teeth 111 provided with the notch 116 simultaneously move along the folding direction D1 to one side of the two protrusions 135 respectively. Hereinafter, only one first tooth 111 corresponding to one of the protrusions 135 will be described as an example). When the first tooth 111 provided with the notch 116 continues to move along the folding direction D1 from the state shown in FIG. 9, the first tooth 111 provided with the notch 116 is blocked along the folding direction D1 by the protrusion 135. As a result, the guide slope 138 along the protrusion 135 moves along the direction parallel to the axial direction I against the elastic force of the spring 150 (that is, further compresses the spring 150, further propels the lock member 130 toward the second connection seat 120, and reduces the hard interference between the first tooth 111 provided with the notch 116 and the protrusion 135) to the end face (that is, the contact surface 160) of the protrusion 135. In this process, the user feels the resistance to the handle 10 due to the contact between the protrusion 135 and the first tooth 111, indicating that the lock joint 100 is about to reach the second locked state and the frame is about to reach the locked and folded state. Until the notch 116 faces the protrusion 135 along the direction parallel to the axial direction I, the lock member 130 receives the elastic force of the spring 150, presses the protrusion 135 against the notch 116, whereby the protrusion 135 engages with the notch 116, the contact surface 160 contacts the abutment surface 119 along the direction parallel to the axial direction I, and the protrusion 135 is further inserted into the first connection seat 110. At this time, the frame is in the locked and folded state shown in FIG. 3, and the lock joint 100 is in the second locked state shown in FIG. 10. However, the user feels that the protrusion 135 is pushed against the notch 116 by the elastic force of the spring 150, indicating that the lock joint 100 has already reached the second locked state.

[0046] The handle 10 and the linkage rod 20 in Fig. 11 are translated and opened to show the internal structure corresponding to the folded lock state of the frame in Fig. 3 and the second lock state of the lock joint 100 in Fig. 10. As shown in Figs. 10 and 11, when the lock joint 100 is in the second lock state, the two protrusions 135 of the lock member 130 are received in one-to-one correspondence with the two notches 116 of the first connection seat 110. The blocking surface 118 receives the block in the deployment direction D2 of the abutting surface 139, thereby restricting the rotation of the first connection seat 110 provided with the notch 116 and the handle 10 in the deployment direction D2 with respect to the lock member 130 and the linkage rod 20 provided with the protrusion 135, that is, restricting the pivotal movement of the handle 10 in the deployment direction D2 with respect to the linkage rod 20. However, the protrusion 135 is convexly provided only on one side in the deployment direction D2 of the corresponding meshing latch tooth 131, and is not convexly provided on one side in the folding direction D1 of the corresponding meshing latch tooth 131. Moreover, since the remaining first tooth 111 is provided with a concave groove 117 for accommodating the protrusion 135, the first tooth 111 provided with the notch 116 can still rotate with respect to the protrusion 135 along the folding direction D1, that is, the handle 10 can still be rotated along the folding direction D1 with respect to the linkage rod 10 and the lock member 130. At the same time, the protrusion 135 (specifically, the abutting surface 160) is blocked by the abutting surface 119 in the direction parallel to the axial direction I, restricting the protrusion of the protrusion 135 along the direction parallel to the axial direction I further into the first connection seat 110. Thereby, the depth at which the lock member 130 is inserted into the first connection seat 110 is much smaller than the depth at which the lock member 130 is inserted into the first connection seat 110 when the lock joint 100 is in the first lock state.

[0047] When in this folded and locked state, if the handle 10 is pushed along the deployment direction D2, since the depth of the recess of the notch 116 is small, the depth at which the locking member 130 is inserted into the first connection seat 110 also becomes small. Even if the blocking surface 118 and the abutting surface 139 are abutted against each other along the circumferential direction C, it causes a certain obstacle to the movement of the handle 10. However, since the depth at which they are abutted against each other is not large, if the handle 10 is strongly pivoted along the direction opposite to the circumferential direction C (i.e., the deployment direction D2), the first tooth 111 provided with the notch 116 is moved to the outside of the end face in the direction parallel to the axial direction I of the protrusion 135 along the direction parallel to the deployment direction D2 and the axial direction I (the locking member 130 is moved toward the second connection seat 120, the spring 150 is compressed, and the hard interference between the first tooth 111 provided with the notch 116 and the protrusion 135 is reduced). After that, by moving over the protrusion 135 and moving to one side of the circumferential direction C where the guide slope 138 of the protrusion 135 is provided, the first tooth 111 provided with the notch 116 abuts against the protrusion 135 along the circumferential direction C, and the protrusion 135 is disengaged from the notch 116. At this time, the lock joint 100 returns to the unlocked state. If the handle 10 is continuously pushed along the deployment direction D2, the lock joint 100 is returned to the first locked state, the frame is returned to the deployed state, and the handle 10 cannot be pivoted with respect to the linkage rod 20 again.

[0048] In another embodiment, the abutting surface 119 may be formed on the end surface in a direction parallel to the axial direction I of the first tooth 111 provided with the notch 116 (i.e., located on one side in the positive direction D1 of the circumferential direction C of the blocking surface 118), and the abutting surface 160 may be formed on the end surface in a direction parallel to the axial direction I of the meshing latch tooth 131 provided with the protrusion 135 (i.e., located on one side in the positive direction D1 of the circumferential direction C of the applying surface 139). When the lock joint 100 is in the second locked state, the protrusion 135 is also received in the notch 116 in the same manner. However, the end surface of the protrusion 135 in the direction parallel to the axial direction I does not abut against the surface of the first tooth 111 located on one side in the direction parallel to the axial direction I of the notch 116. Since the abutting surface 119 and the abutting surface 160 abut against each other along the direction parallel to the axial direction I, the engagement depth between the lock member 130 and the first connection seat 110 can also be limited.

[0049] In another embodiment, the two protrusions 135 may be provided on the two first teeth 111, the two notches 116 may be provided on the two meshing latch teeth 131, and the plurality of concave grooves 117 may be provided on the remaining plurality of meshing latch teeth 131 and lock latch teeth 132, 134. By the application between the applying surface 139 and the blocking surface 118 on the protrusion 135 (in this case, the blocking surface 118 is provided on one side in the reverse direction D2 of the circumferential direction C of the protrusion 135, and the applying surface 139 is provided on one side in the reverse direction D2 of the circumferential direction C of the notch 116), the movement of the handle 10 in the deployment direction D2 with respect to the linkage rod 20 is restricted. The end surface of the protrusion 135 in the direction parallel to the axial direction I (i.e., the abutting surface 160) abuts against the abutting surface 119 of the notch 116, thereby restricting the engagement depth between the lock member 130 and the first connection seat 110. FIGS. 12 to 18 show another embodiment of the lock joint 100 according to the present disclosure. To avoid duplication, the description of the same parts as those in the embodiment of FIGS. 1 to 11 in this embodiment is omitted.

[0050] Figures 12 and 13 are exploded views of a lock joint 100A according to another embodiment. Figure 14 is a perspective view of a first connection seat 110A and a lock member 130A according to another embodiment. In order to show the internal structures of the first connection seat 110A and the lock member 130A, the first connection seat 110A and the lock member 130A are translated and opened, and the lock member 130A rotates at a certain angle. According to this embodiment, as shown in Figures 12, 13 and 14, the two engaging portions 135A of the lock member 130A are two protruding veins 135A. Hereinafter, the protruding vein 135A will be described as an example. The two protruding veins 135A are provided in one-to-one correspondence with two meshing latch teeth 131A provided at intervals along the circumferential direction C. The two meshing latch teeth 131A are provided at an interval of approximately 180°. Specifically, the protruding vein 135A protrudes from the end surface away from the second connection seat 120A of the corresponding meshing latch tooth 131A along a direction parallel to the axial direction I towards the first connection seat 110A, and is located at the radially outer end of the corresponding meshing latch tooth 131A and protrudes along the radial direction at the radially outer end of the meshing latch tooth 131A. That is, the protruding vein 135A is not continuously provided along the radial direction on the entire end surface away from the second connection seat 120A in the direction parallel to the axial direction I of the corresponding meshing latch tooth 131A. Possibly, the protruding vein 135A may be provided on the lock latch teeth 132A and the lock latch teeth 134A. The guide slope 138A, the fitting surface 139A and the contact surface 160A of the lock member 130A are all formed on the surface of the protruding vein 135A. Specifically, the guide slope 138A is formed on the surface of the protruding vein 135A on the side of the reverse direction D2 of the circumferential direction C, and is inclined with respect to the radial direction and the circumferential direction C. The fitting surface 139A is formed on the surface of the protruding vein 135A on the side of the positive direction D1 of the circumferential direction C, and is also inclined with respect to the radial direction and the circumferential direction C. That is, the fitting surface 139A is also provided as a slope, and the inclination angle of the guide slope 138A is larger than the inclination angle of the fitting surface 139A. The contact surface 160A is formed on the end surface in the direction parallel to the axial direction I of the protruding vein 135A.Specifically, the guide slope 138A and the application surface 139A are connected to each other, and an obtuse angle is formed between the guide slope 138A and the application surface 139A. Both the guide slope 138A and the application surface 139A are parallel to the axial direction I, and the contact surface 160A and the axial direction I are perpendicular to each other. As shown in FIG. 14, the two position limiting portions 116A of the first connection seat 110A are formed at intervals along the circumferential direction C on the inner circumference of the circular accommodation portion. The two position limiting portions 116A (provided on the boss 116A, and hereinafter, the boss 116A will be described as an example) are provided in one-to-one correspondence with two first teeth 111A provided at intervals along the circumferential direction C. The two first teeth 111A are provided at approximately 180° intervals. The boss 116A is formed to protrude from the end surface of the first tooth 111A near the second connection seat 120A toward the second connection seat 120A along a direction parallel to the axial direction I, and is provided on one side in the positive direction D1 of the circumferential direction C of the corresponding first tooth 111A, but is not provided on one side in the reverse direction D2 of the circumferential direction C of the corresponding first tooth 111A. That is, the boss 116A does not cover the entire end surface of the corresponding first tooth 111 along the circumferential direction C. The boss 116A extends beyond the corresponding first tooth 111A along the positive direction D1 of the circumferential direction C, but does not extend to the adjacent first tooth 111A. The boss 116A is provided along the radial direction at the end of the corresponding first tooth 111A (the circular accommodation portion near the first connection seat 110A). The protruding length of the boss 116A in the direction parallel to the axial direction I is less than or equal to the protruding length of the protruding vein 135A in the direction parallel to the axial direction I.

[0051] As shown in FIG. 14, in this embodiment, the blocking surface 118A of the first connection seat 110A is formed on the surface of the boss 116A on the reverse direction D2 side of the circumferential direction C. The blocking surface 118A is inclined in the circumferential direction C and the radial direction. Specifically, the blocking surface 118A coincides with the inclination angle of the application surface 139A, and the blocking surface 118A is further parallel to the axial direction I.

[0052] As shown in FIG. 14, in the present embodiment, the abutting surface 119A of the first connection seat 110A is formed on the end surface closer to the second connection seat 120A in the direction parallel to the axial direction I of the first tooth 111A provided with the boss 116A, and is located on one side in the reverse direction D2 of the circumferential direction C of the blocking surface 118A. The abutting surface 119A extends along a direction intersecting the axial direction I. Specifically, the abutting surface 119A extends along a direction perpendicular to the axial direction I. The blocking surface 118A and the abutting surface 119A are perpendicular to each other.

[0053] As shown in FIG. 14, in the present embodiment, in addition to the blocking surface 118A and the abutting surface 119A being provided on the first connection seat 110A to be consistent with the embodiments of FIGS. 1 to 10, a guide slope S is further provided on one side in the positive direction D1 of the circumferential direction C of the boss 116A and is inclined in the circumferential direction C and the radial direction. When the lock joint 100 is in the unlocked state, the guide slope S abuts against the guide slope 138A along the positive direction D1 of the circumferential direction C and slides, thereby moving the boss 116A from one side of the guide slope 138A of the protruding vein 135A to one side of the targeting surface 139A of the protruding vein 135A along the positive direction D1 of the circumferential direction C. Specifically, the guide slope S is consistent with the inclination angle of the guide slope 138A, and at least a part of the guide slope S extends beyond the first tooth 111A along the positive direction D1 of the circumferential direction C.

[0054] As shown in FIG. 14, in this embodiment, in addition to the first tooth 111A provided with the boss 116A, in other first teeth 111A, from the end face near the second connection seat 120A in the direction parallel to the axial direction I of each first tooth 111A, on the side away along the direction parallel to the axial direction I from the second connection seat 120A, a concave groove 117A is recessed and formed. The concave groove 117A penetrates the entire corresponding first tooth 111A along the circumferential direction C, but does not penetrate the entire corresponding first tooth 111A along the radial direction. That is, the groove bottom of the concave groove 117A is not the end face where the first tooth 111A is closest to the second connection seat 120A along the direction parallel to the axial direction I, and the depth at which the concave groove 117A is recessed is not less than the length at which the protruding vein 135A protrudes. The concave groove 117A is for the protruding vein 135A to retreat in position when moving along the circumferential direction C when the lock joint 100A is in the unlocked state.

[0055] As shown in FIG. 14, in this embodiment, it is preferable that the height of the protruding vein 135A is equal to the height of the boss 116A.

[0056] FIG. 15 is a cross-sectional view of the lock member 130A according to another embodiment. According to this embodiment, two concave portions 137A are further provided on the lock member 130A. The two concave portions 137A are formed in one-to-one correspondence with the two meshing latch teeth 131A provided with the protruding vein 135A. Each concave portion 137A is recessed from the end face away from the second connection seat 120A of the meshing latch tooth 131A along the direction parallel to the axial direction I, and is formed along the radial direction between the free end of the protruding vein 135A and the corresponding meshing latch tooth 131A, thereby strengthening the elastic deformation of the protruding vein 135A in the radial direction.

[0057] As shown in FIG. 16, FIG. 16 is a partial schematic view along the circumferential direction C in which the lock joint 100A according to another embodiment is in the unlocked state. This schematic view shows the latch teeth 131A with the protruding veins 135A and the boss 116A on the inner circumference of the first connection seat 110A. In the state shown in FIG. 16, just before the frame reaches the folded lock state and the lock joint 100A reaches the second lock state, the boss 116A continues to move in the folding direction D1 from the state shown in FIG. 16, and the guide slope S extending along the circumferential direction C abuts against the guide slope 138A and slides, causing the boss 116A to radially elastically deform the free end of the protruding vein 135A. Thereby, the boss 116A guides the protruding vein 135A to slide along the folding direction D1. In this process, the user feels the resistance to the handle 10A due to the contact between the protruding vein 135A and the boss 116A, indicating that the lock joint 100A is about to reach the second lock state and the frame is about to reach the locked folded state.

[0058] FIG. 17 is a perspective view of the first connection seat 110A, the lock member 130A, and the spring 150A according to another embodiment. The lock piece 130A is applied to the end face of the first tooth 111A of the first connection seat 110A by the elastic force of the spring 150A in the spring housing portion 136A. The contact surface 139A of the protruding vein 135A is applied to the blocking surface 118A of the boss 116A (the protruding vein 135A and the boss 116A are in contact along the circumferential direction), and when the protruding vein 135A and the boss 116A are engaged, the boss 116A is restricted from pivoting relative to the protruding vein 135A along the deployment direction D2, that is, the handle 10 is restricted from pivoting relative to the linkage rod 20 along the deployment direction D2. At this time, the lock joint 100A is in the second lock state and the frame is in the folded lock state. However, at this time, when the first connection seat 110A rotates along the folding direction D1, the handle 10 can be further folded without the protruding vein 135A and the boss 116A affecting each other.

[0059] FIG. 18 is a perspective view of a lock joint 100A according to another embodiment. The state of each member in FIG. 18 corresponds to that in FIG. 11, and here, for showing the internal structure, it is opened in parallel. As shown in FIGS. 17 and 18, when the lock joint 100A is in the second locked state, the frame is in the folded locked state, and the first connection seat 110A rotates along the deployment direction D2, due to the fact that the large-gradient abutment surface 139A and the blocking surface 118A are abutted against each other, it cannot be easily deployed. However, the protruding length in the direction parallel to the axial direction I of the boss 116A is small, and the protruding length in the direction parallel to the axial direction I of the protruding vein 135A is equal to or greater than the protruding length in the direction parallel to the axial direction I of the boss 116A. Therefore, when the user strongly rotates the first connection seat 110A along the deployment direction D2, the boss 116A can also elastically deform the free end of the protruding vein 135A in the radial direction, and the boss 116A guides the protruding vein 135A as if it slides along the deployment direction D2, thereby enabling the large-gradient abutment surface 139A and the blocking surface 118A not to be abutted against each other, and the lock joint 100A returns to the unlocked state. At the same time, in the state shown in FIGS. 17 and 18, the abutting surface 160A of the protruding vein 135A is further blocked by the stopping surface 119A in the direction parallel to the axial direction I, while the protruding vein 135A is restricted from protruding further into the first connection seat 110A along the direction parallel to the axial direction I. As a result, the depth at which the locking member 130A is inserted into the first connection seat 110A is smaller than the depth at which the locking member 130A is inserted into the first connection seat 110A when the lock joint 100A is in the first locked state.

[0060] Without departing from the spirit and essence of the present application, it can be specifically implemented in various forms. Therefore, the above embodiments are not limited to any of the above details, and should be interpreted as widely as possible within the scope defined by the claims. All changes falling within the scope of the claims or their equivalent scope should be covered by the claims.

Description of Reference Numerals

[0061] 1 Child carrier 10, 10A Handle 11 Operating member 20, 20A Interlocking rod 30 Handlebar 40 Front leg assembly 50 Rear leg assembly 60 Seat assembly 70 Handrail 100, 100A Lock joint 110, 110A First connection seat 111, 111A First tooth 112, 112A Pin shaft 113, 113A Driving part 114, 114A Lock part 115, 115A Lock part 116, 116A Position limiting part, notch, boss 117, 117A Groove 118, 118A Blocking surface 119, 119A Contact surface S Guide slope 120, 120A Second connection seat 121, 121A Second tooth 122, 122A Lock part 123, 123A Lock part 130, 130A Lock member 131, 131A Engaging latch tooth 132, 132A Lock latch tooth 133, 133A Perforation 134, 134A Lock latch tooth 135, 135A Engaging part, protrusion, ridge 136, 136A Spring housing part 137A Concave part 138, 138A Guide slope 139, 139A Contact surface 160, 160A Contact surface 140, 140A Driving member 141, 141A Perforation 142, 142A Driving part 150, 150A Elastic members, springs 200 Frame joint I-axis direction C circumferential direction D1 Folding direction, positive direction of circumferential direction C D2 Deployment direction, reverse direction of circumferential direction C

Claims

1. A locking joint comprising a first connection seat, a second connection seat, and a locking member, wherein the first connection seat and the second connection seat are pivotable relative to each other about an axial direction and along a circumferential direction, the locking member is provided between the first connection seat and the second connection seat along the axial direction and can engage with both of them so as to be movable relative to both of them along the axial direction, the first connection seat is provided with a position limiting portion extending along a direction parallel to the axial direction, and the locking member is provided with an engaging portion extending along a direction parallel to the axial direction, when the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the first connection seat is pivotable relative to the second connection seat along the positive direction of the circumferential direction, but is non-pivotable relative to the second connection seat along the reverse direction of the circumferential direction, A locking joint characterized by the above.

2. A plurality of first teeth are provided on the inner circumference of the first connection seat at intervals along the circumferential direction, A plurality of second teeth are provided on the inner circumference of the second connection seat at intervals along the circumferential direction, A plurality of latch teeth are provided on the outer circumference of the locking member at intervals along the circumferential direction and can engage with the first teeth and the second teeth, the position limiting portion is provided on an end face closer to the second connection seat in a direction parallel to the axial direction of one of the first teeth, and the engaging portion is provided on an end face away from the second connection seat in a direction parallel to the axial direction of one of the latch teeth, the first connection seat is further provided with a blocking surface, the blocking surface is located on one side of the position limiting portion in the circumferential direction and is located on the same first tooth as the position limiting portion, the locking member is further provided with a targeting surface located on one side of the engaging portion in the circumferential direction and is located on the same latch tooth as the engaging portion. When the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the plurality of latch teeth engage alternately with the plurality of second teeth along the circumferential direction, and at least one of the latch teeth faces at least one of the first teeth along a direction parallel to the axial direction. The abutting surface and the applying surface abut against each other along the circumferential direction, and the applying surface is located on one side in the reverse direction of the circumferential direction of the blocking surface, so that the position limiting portion is restricted from pivoting in the reverse direction of the circumferential direction with respect to the engaging portion. The locking joint according to claim 1, characterized in that.

3. The engaging portion is formed to protrude from an end surface of the corresponding latch tooth away from the second connection seat along a direction parallel to the axial direction toward the first connection seat. The applying surface is located on a surface on the positive direction side in the circumferential direction of the engaging portion. The locking joint according to claim 2, characterized in that.

4. The engaging portion is located on one side in the reverse direction of the circumferential direction of the corresponding latch tooth and does not extend to one side in the positive direction of the circumferential direction of the corresponding latch tooth. The position limiting portion is formed to be recessed from an end surface of the corresponding first tooth near the second connection seat along a direction parallel to the axial direction toward a side away from the second connection seat. The position limiting portion is located on one side in the reverse direction of the circumferential direction of the corresponding first tooth and penetrates the corresponding first tooth along the reverse direction of the circumferential direction. The blocking surface is located on one side in the positive direction of the circumferential direction of the position limiting portion. When the position limiting portion and the engaging portion are engaged, the engaging portion is at least partially fitted into the position limiting portion. The locking joint according to claim 3, characterized in that.

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

6. At least one of the first connection seat and the locking member is provided with a guide slope for guiding the first tooth provided with the position limiting portion to cross over the engaging portion along the positive direction of the circumferential direction. The guide slope is provided on the surface on the positive side in the circumferential direction of the first tooth where the position limiting portion is provided, and is inclined along a direction parallel to the axial direction and the circumferential direction, and / or The guide slope is provided on the surface on the reverse side in the circumferential direction of the engaging portion, and is inclined in a direction parallel to the axial direction and the circumferential direction. The locking joint according to claim 4, characterized in that.

7. A butting surface is further provided on the first connection seat, the butting surface is located on one side in the circumferential direction of the blocking surface, and the butting surface and the blocking surface are located on the same first tooth. The locking member is further provided with a contact surface located on one side in the circumferential direction of the butting surface, and the contact surface and the butting surface are located on the same latch tooth. When the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the butting surface and the contact surface abut against each other along a direction parallel to the axial direction. The locking joint according to claim 4, characterized in that.

8. The butting surface is located on one side in the reverse direction in the circumferential direction of the blocking surface and one side in the direction parallel to the axial direction of the position limiting portion, and the contact surface is located on one side in the reverse direction in the circumferential direction of the butting surface and one side in the direction parallel to the axial direction of the engaging portion, or The butting surface is located on one side in the positive direction in the circumferential direction of the blocking surface, and the contact surface is located on one side in the positive direction in the circumferential direction of the butting surface. The locking joint according to claim 7, characterized in that.

9. The engaging portion is located at the radially outer end of the corresponding latch tooth. The position limiting portion is formed to protrude from the end surface near the second connection seat of the corresponding first tooth toward the second connection seat along a direction parallel to the axial direction. The position limiting portion is located on one side in the positive direction in the circumferential direction of the corresponding first tooth and does not extend to one side in the reverse direction in the circumferential direction of the corresponding first tooth. The blocking surface is located on the surface on the reverse side in the circumferential direction of the position limiting portion. When the position limiting portion and the engaging portion are engaged, the engaging portion abuts against the position limiting portion along the circumferential direction. The locking joint according to claim 3, characterized in that.

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

11. At least one of the first connection seat and the locking member is provided with a guide slope for guiding the position limiting portion to cross over the engaging portion along the positive direction of the circumferential direction. The guide slope is provided on the surface of the position limiting portion on the positive side in the circumferential direction, and is inclined along both the radial direction and the circumferential direction, and / or The guide slope is provided on the surface of the engaging portion on the reverse side in the circumferential direction, and is inclined along both the radial direction and the circumferential direction. The locking joint according to claim 10, characterized in that.

12. The inclination angle of the abutting surface is larger than the inclination angle of the guide slope. The locking joint according to claim 11, characterized in that.

13. The locking member is provided with a recess, and the recess is recessed from the end surface away from the second connection seat of the latch tooth provided with the engaging portion along a direction parallel to the axial direction toward the second connection seat, and is formed between the latch tooth corresponding to the engaging portion along the radial direction. The locking joint according to claim 9, characterized in that.

14. The first connection seat is further provided with an abutting surface located on the end surface closer to the second connection seat in the direction parallel to the axial direction of the first tooth provided with the position limiting portion, and located on one side in the reverse direction of the circumferential direction of the blocking surface. The locking member is further provided with an abutting surface located on the end surface away from the second connection seat in the direction parallel to the axial direction of the engaging portion. When the locking member engages with the second connection seat and the engaging portion engages with the position limiting portion, the abutting surface and the abutting surface are in contact with each other along the direction parallel to the axial direction. The locking joint according to claim 9, characterized in that.

15. In addition to the first tooth provided with the position limiting portion, each of the remaining first teeth is provided with a concave groove, and the concave groove is recessed from the end surface near the second connection seat of the corresponding first tooth along a direction parallel to the axial direction toward the side away from the second connection seat. The concave groove penetrates the corresponding first tooth in the circumferential direction, and the concave groove is configured to accommodate the engaging portion along a direction parallel to the axial direction. The locking joint according to claim 3, characterized in that.

16. A frame, A child carrier comprising the locking joint according to any one of claims 1 to 15, The frame includes a handle and an interlocking rod pivotally attached to the handle via the locking joint. The handle is connected to the first connection seat, and the interlocking rod is connected to the second connection seat. When the handle pivots toward the interlocking rod along the positive direction of the circumferential direction, folding between the handle and the interlocking rod is realized. When the handle pivots away from the interlocking rod along the reverse direction of the circumferential direction, unfolding between the handle and the interlocking rod is realized. A child carrier, characterized in that.

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