Joint structure and stroller

Abstract

The utility model discloses a joint structure, including first joint seat and with first joint seat around first axis rotation connection's second joint seat, be equipped with linear slot along the radial direction on first joint seat, and the first axis position rotation connection has first transmission piece on second joint seat and deviate, first transmission piece is connected with the pin shaft that is arranged in linear slot and can slide in linear slot when second joint seat relative first joint seat rotates, first joint seat still has the third joint seat around second axis rotation connection, and the second axis position rotation connection has second transmission piece on third joint seat and deviate, and the pin shaft is also connected on second transmission piece to make when second joint seat relative first joint seat rotates and draws close, can drive third joint seat to first joint seat rotation and draw close through second transmission piece. The utility model discloses still adopt the children's push car of preceding and following joint structure, the utility model discloses joint structure and children's push car structure simple, and unfolding is nimble.

Description

[Technical Field]

[0001] This utility model relates to a joint structure, and also to a children's stroller. [Background Technology]

[0002] Strollers, high chairs, swings, and rocking chairs are common products used during a child's growth. Currently, these products generally utilize joint structures to unfold or fold, facilitating carrying or storage when folded. However, the types and structures of these joint structures vary, and their folding and unfolding principles differ. Therefore, this invention provides a novel joint structure and stroller that differs from existing technologies. [Utility Model Content]

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a joint structure that is simple in structure and flexible in opening and closing.

[0004] This utility model also provides a children's stroller with a simple structure and flexible unfolding and folding.

[0005] This utility model is achieved through the following technical solution:

[0006] A joint structure, movable from an unfolded position to a folded position after a locking device is unlocked, includes a first joint seat and a second joint seat rotatably connected to the first joint seat about a first axis. The first joint seat has a linear groove in the radial direction. The second joint seat is rotatably connected to a first transmission plate off the first axis. The first transmission plate is connected to a pin that passes through the linear groove and can slide within the linear groove when the second joint seat rotates relative to the first joint seat. The first joint seat is also rotatably connected to a third joint seat about a second axis. The third joint seat is rotatably connected to a second transmission plate off the second axis. The pin is also connected to the second transmission plate so that when the second joint seat rotates closer to the first joint seat, the second transmission plate can drive the third joint seat to rotate closer to the first joint seat.

[0007] The first joint seat, the second joint seat, and the third joint seat are rotatably connected to each other via a connecting shaft, and the first axis and the second axis are collinear and coincident, forming the axis of the connecting shaft.

[0008] The first transmission plate is provided with a first clearance groove to make way for the connecting shaft when it rotates; the second transmission plate is provided with a second clearance groove to make way for the connecting shaft when it rotates; the second joint seat is provided with a third clearance groove to make way for the pin when it rotates; and the third joint seat is provided with a fourth clearance groove to make way for the pin when it rotates.

[0009] The locking device includes a radial groove on a second joint seat, a locking pin that can move radially within the radial groove, a first groove on a first joint seat that can engage with the locking pin, and a third groove on a third joint seat that can engage with the locking pin. When the locking device is locked, the locking pin engages with both the first and third grooves simultaneously. The first joint seat has a first arc-shaped groove that allows the locking pin to move within the first and third grooves when it exits them. The third joint seat has a third arc-shaped groove that allows the locking pin to move within the first and third grooves when it exits them. A sliding rod is provided within the second joint seat, the locking pin is laterally fixed to the sliding rod, and a return spring is provided between the sliding rod and the second joint seat to push the sliding rod to slide back to its original position.

[0010] The third joint seat includes a fixed rod, and the upper end of the fixed rod is provided with a left seat body and a right seat body that are spaced apart from each other. The second transmission plate is connected to both the left seat body and the right seat body. The second joint seat is located between the left seat body and the right seat body. There are two first joint seats, one of which is located on the outside of the left seat body and the other of which is located on the outside of the right seat body. There are two first transmission plates, both of which are connected to the first joint seats. The connecting shaft passes through the first joint seats, the second joint seat of the left seat body, and the right seat body.

[0011] The first transmission plate is provided with a first clearance groove that makes way for the connecting shaft when it rotates, and the second transmission plate is provided with a second clearance groove that makes way for the connecting shaft when it rotates, the second joint seat is provided with a third clearance groove that makes way for the pin when it rotates, and the third joint seat is provided with a fourth clearance groove that makes way for the pin when it rotates.

[0012] The locking device includes a radial groove on a second joint seat, a locking pin that can move radially within the radial groove, a first groove on a first joint seat that can engage with the locking pin, and third grooves on both the left and right joint seats that can engage with the locking pin. When the locking device is locked, the locking pin engages with both the first and third grooves simultaneously. The first joint seat has a first arc-shaped groove that allows the locking pin to move within the first and third grooves when it exits them. The left and right joint seats have third arc-shaped grooves that allow the locking pin to move within the first and third grooves when it exits them. A sliding rod is provided inside the second joint seat, the locking pin is laterally fixed to the sliding rod, and a return spring is provided between the sliding rod and the second joint seat to push the sliding rod to slide back to its original position.

[0013] A stroller includes two symmetrically arranged joint structures as described above. A rear leg is connected to each of the first joint seats, a push rod assembly is connected to each of the second joint seats, and a front leg is connected to each of the third joint seats. A wheel is provided at the lower end of each of the front and rear legs, and a foldable seat assembly is provided on the inner side of the third joint seat.

[0014] A stroller includes the joint structure described above. A rear leg is connected to a first joint seat, a push rod assembly is connected to a second joint seat, a front leg is connected to a fixed rod, and wheels are provided at the lower ends of the front and rear legs. A protruding connecting portion is connected to a left seat and a right seat body. A seat support is connected to the connecting portion. The rear side of the seat support is rotatably connected to the connecting portion. A traction assembly is provided between the front side of the seat support and the front leg, which can pull the seat support towards the front leg. The traction assembly includes an upper connecting rod rotatably connected to the seat support at its upper end and a lower connecting rod rotatably connected to the fixed rod at its lower end. The upper end of the lower connecting rod is rotatably connected to the lower end of the upper connecting rod. The traction assembly also includes a linkage rod. The front end of the linkage rod is rotatably connected to the lower end of the upper connecting rod, and the rear end of the linkage rod is movably connected to the second joint seat. A foldable seat assembly is connected to the seat support.

[0015] The second joint seat has an arc-shaped second arc groove along the circumferential direction, the second arc groove having a second starting end and a second ending end. The third joint seat has an arc-shaped third arc groove along the circumferential direction, the third arc groove having a third starting end and a third ending end. The rear end of the linkage rod has a movable shaft passing through the second arc groove and the third arc groove. When the stroller is unfolded, the second ending end and the third starting end clamp the movable shaft to position the linkage rod. During the rotation and folding process of the second joint seat relative to the first joint seat, the second starting end pushes the movable shaft to move in the third arc groove, thereby causing the linkage rod to pull the seat support to fold.

[0016] Compared with the prior art, this utility model has the following advantages: When the joint structure of this utility model is folded or closed, the second joint seat rotates and approaches relative to the first joint seat. During the rotation, since the first transmission plate is rotatably connected to the second joint seat and deviates from the position of the first axis, the second joint seat causes the pin on the first transmission plate to slide in the radial straight groove during the aforementioned rotation. The first transmission plate rotates relative to the second joint seat. Since the pin is also connected to the second transmission plate, when the pin slides in the straight groove, the pin drives the second transmission plate to rotate relative to the third joint seat. The second transmission plate is rotatably connected to the third joint seat and deviates from the position of the second axis. Therefore, when the pin slides in the straight groove, the pin pulls the third joint seat to rotate and approach relative to the first joint seat through the second transmission plate, thereby realizing the folding of the joint structure. During the unfolding operation, the second joint seat rotates in the opposite direction, and the pin moves in the opposite direction in the straight groove. The pin then opens the third joint seat through the second transmission plate, thereby realizing the unfolding movement of the entire joint structure. The entire joint structure is simple and unfolds or folds flexibly and smoothly. The aforementioned joint structure of this utility model children's stroller also achieves the purpose of a simple stroller structure and flexible and smooth unfolding or folding. [Attached Image Description]

[0017] Figure 1 This is a perspective view of embodiment 1 of the joint structure of this utility model;

[0018] Figure 2 This is one of the exploded views of Embodiment 1 of the joint structure of this utility model;

[0019] Figure 3 This is the second exploded view of Embodiment 1 of the joint structure of this utility model;

[0020] Figure 4 This is the third exploded view of Embodiment 1 of the joint structure of this utility model;

[0021] Figure 5 This is one of the cross-sectional views of embodiment 1 of the joint structure of this utility model;

[0022] Figure 6 This is a second sectional view of embodiment 1 of the joint structure of this utility model;

[0023] Figure 7 This is the third sectional view of Embodiment 1 of the joint structure of this utility model;

[0024] Figure 8 This is the fourth sectional view of Embodiment 1 of the joint structure of this utility model;

[0025] Figure 9 This is a perspective view of Embodiment 1 of the children's stroller of this utility model;

[0026] Figure 10This is a perspective view of embodiment 2 of the joint structure of this utility model;

[0027] Figure 11 This is one of the exploded views of Embodiment 2 of the joint structure of this utility model;

[0028] Figure 12 This is the second exploded view of embodiment 2 of the joint structure of this utility model;

[0029] Figure 13 This is one of the unfolded sectional views of Embodiment 2 of the joint structure of this utility model;

[0030] Figure 14 This is the second sectional view of the unfolded state of Embodiment 2 of the joint structure of this utility model;

[0031] Figure 15 This is the third sectional view of the unfolded state of Embodiment 2 of the joint structure of this utility model;

[0032] Figure 16 This is the fourth sectional view of the unfolded state of Embodiment 2 of the joint structure of this utility model;

[0033] Figure 17 This is one of the cross-sectional views of the joint structure embodiment 2 of this utility model during the folding process;

[0034] Figure 18 This is the second sectional view of the joint structure embodiment 2 of this utility model during the folding process;

[0035] Figure 19 This is the third sectional view of the joint structure embodiment 2 of this utility model during the folding process;

[0036] Figure 20 This is the fourth sectional view of the joint structure embodiment 2 of this utility model during the folding process;

[0037] Figure 21 An immersive perspective view of embodiment 2 of this utility model of a children's stroller.

Detailed Implementation Methods

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Joint structure example 1:

[0040] like Figures 1 to 8As shown, a joint structure that can move from an unfolded position to a folded position after the locking device is unlocked includes a first joint seat 1 and a second joint seat 2 rotatably connected to the first joint seat 1 about a first axis A. The first joint seat 1 has a straight groove 11 in the radial direction. The second joint seat 2 is rotatably connected to a first transmission plate 41 off the first axis A. The first transmission plate 41 is connected to a pin 43 that passes through the straight groove 11 and can slide in the straight groove 11 when the second joint seat 2 rotates relative to the first joint seat 1. The first joint seat 1 is also rotatably connected to a third joint seat 3 about a second axis B. The third joint seat 3 is rotatably connected to a second transmission plate 42 off the second axis B. The pin 43 is also connected to the second transmission plate 42 so that when the second joint seat 2 rotates closer to the first joint seat 1, the second transmission plate 42 can drive the third joint seat 3 to rotate closer to the first joint seat 1. When the joint structure is folded, the second joint seat 2 rotates and approaches relative to the first joint seat 1. During the rotation, since the first transmission plate 41 is rotatably connected to the second joint seat 2 and deviates from the position of the first axis A, the second joint seat 2 causes the pin 43 on the first transmission plate 41 to slide downward in the radial straight groove 11. The straight groove 11 restricts the movement trajectory of the pin 43. The first transmission plate 41 rotates relative to the second joint seat 22. Since the pin 43 is also connected to the second transmission plate 42, when the pin 43 slides downward in the straight groove 11, the pin 43 drives the second transmission plate 42 to rotate relative to the third joint seat 3. The second transmission plate 42 is rotatably connected to the third joint seat 3 and deviates from the position of the second axis B. Therefore, when the pin 43 slides downward in the straight groove 11, the pin 43 pulls the third joint seat 3 to rotate and approach relative to the first joint seat 1 through the second transmission plate 42, thereby realizing the folding of the joint structure. During the unfolding operation, the second joint seat 2 rotates in the opposite direction, and the pin 43 moves upward within the straight groove 11. The pin 43 then expands the third joint seat 3 through the second transmission plate 42, thereby realizing the unfolding movement of the entire joint structure. The overall joint structure is relatively simple, and its unfolding or folding is flexible and smooth.

[0041] like Figures 1 to 8 As shown, the first joint seat 1, the second joint seat 2, and the third joint seat 3 are rotatably connected to each other via the connecting shaft 10. The first axis A and the second axis B are collinear and coincident, forming the axis of the connecting shaft 10, making the entire joint structure simple and compact, and allowing for flexible closing or unfolding movements.

[0042] like Figures 1 to 8As shown, the first transmission plate 41 has a first clearance groove 51 that makes way for the connecting shaft 10 when it rotates; the second transmission plate 42 has a second clearance groove 52 that makes way for the connecting shaft 10 when it rotates; the second joint seat 2 has a third clearance groove 53 that makes way for the pin 43 when it rotates; and the third joint seat 3 has a fourth clearance groove 54 that makes way for the pin 43 when it rotates. This design ensures that the joint structure avoids interference during unfolding or retracting movements while also providing guidance, resulting in flexible and smooth unfolding or retracting movements.

[0043] like Figure 4 and Figure 6 As shown, the locking device includes a radial groove 61 provided on the second joint seat 2 in the radial direction, a locking pin 62 that can move radially within the radial groove 61, a first groove 63 that can engage with the locking pin 62 in the radial direction on the first joint seat 1, and a third groove 64 that can engage with the locking pin 62 in the radial direction on the third joint seat 3. When the locking device is locked, the locking pin 62 engages simultaneously with the first groove 63 and the third groove 64. The first joint seat 1 is provided with a locking mechanism... When the locking pin 62 exits the first slot 63 and the third slot 64, a first arc-shaped groove 65 allows the locking pin 62 to move within it. The third joint seat 3 has a third arc-shaped groove 66 that allows the locking pin 62 to move within it when it exits the first slot 63 and the third slot 64. The second joint seat 2 has a sliding rod 67 that can slide. The locking pin 62 is laterally fixed to the sliding rod 67. A return spring 68 is provided between the sliding rod 67 and the second joint seat 2 to push the sliding rod 67 back to its original position. When unlocking is required, the sliding rod 67 is first slid to disengage the locking pin 62 from the first slot 63 and the third slot 64, at which point the second joint seat 2 can be rotated. In this embodiment, a pull rope 69 is connected to the sliding rod 67. Pulling the pull rope 69 causes the sliding rod 67 to slide, thereby disengaging the locking pin 62 from the first slot 63 and the third slot 64.

[0044] like Figure 3 and Figure 4 As shown, in this embodiment, a fixing block 44 is fixed on the pin 43, and the first joint seat 1 is provided with a sliding groove 12 for the fixing block 44 to slide inside, so as to make the movement more stable.

[0045] Example 1 of stroller:

[0046] like Figure 9As shown, a stroller includes two symmetrically arranged joint structures as described in Embodiment 1 above. Each first joint seat 1 is connected to a rear leg 71, each second joint seat 2 is connected to a push rod assembly 72, and each third joint seat 3 is connected to a front leg 73. Each front leg 73 and rear leg 71 has a wheel 74 at its lower end. A foldable seat assembly 8 is provided inside the third joint seat 3. When folding the stroller, the seat assembly 8 is folded first. The seat assembly 8 can adopt a traditional seat assembly structure, which will not be described in detail here. After the locking device is unlocked, the push rod assembly 72 is rotated backward. The push rod assembly 72 and the second joint seat 2 rotate backward and move towards the rear leg 71. During this process, the pin 43 slides downward in the straight groove 11 and pulls the second transmission plate 42 to rotate. The second transmission plate 42 then pulls the third joint seat 3 to rotate and move towards the first joint seat 1, thereby causing the front leg 73 to move towards the rear leg 71, thus realizing the folding of the stroller. The stroller has a simple structure and is flexible in folding and unfolding. When unfolding, simply rotate the push rod assembly 72 in the opposite direction, and finally unfold the folded seat assembly 8.

[0047] Joint structure example 2:

[0048] like Figures 10 to 20As shown, a joint structure, which can move from an unfolded position to a folded position after the locking device is unlocked, includes a first joint seat 1 and a second joint seat 2 rotatably connected to the first joint seat 1 about a first axis A. The first joint seat 1 has a linear groove 11 in the radial direction. The second joint seat 2 is rotatably connected to a first transmission plate 41 off-center from the first axis A. A pin 43 is connected to the first transmission plate 41, which passes through the linear groove 11 and slides within the linear groove 11 when the second joint seat 2 rotates relative to the first joint seat 1. The first joint seat 1 also has… A third joint seat 3 is rotatably connected around the second axis B. A second transmission plate 42 is rotatably connected to the third joint seat 3 at a position offset from the second axis B. The pin 43 is also connected to the second transmission plate 42 so that when the second joint seat 2 rotates closer to the first joint seat 1, the second transmission plate 42 can drive the third joint seat 3 to rotate closer to the first joint seat 1. The first joint seat 1, the second joint seat 2, and the third joint seat 3 are rotatably connected to each other through the connecting shaft 10. The first axis A and the second axis B are collinear and coincident, forming the axis of the connecting shaft 10. The third joint seat 3 includes a fixing rod 31. The upper end of the fixing rod 31 is provided with a left seat body 32 and a right seat body 33 spaced apart from each other. The second transmission plate 42 is connected to both the left seat body 32 and the right seat body 33. The second joint seat 2 is located between the left seat body 32 and the right seat body 33. There are two first joint seats 1, one located outside the left seat body 32 and the other outside the right seat body 33. There are two first transmission plates 41, both connected to the first joint seats 1. The connecting shaft 10 passes through the first joint seat 1, the left seat body 32, the second joint seat 2, and the right seat body 33. This embodiment of the joint structure is suitable for applications such as... Figure 21 Another stroller with a different design is shown, featuring two rear legs 71, one front leg 73, and a push rod assembly 72. The front leg 73 is connected to a fixed rod 31, while the two rear legs 71 are connected to two first joint seats 1. The push rod assembly 72 is connected to a second joint seat 2. In this embodiment, when folded, the second joint seat 2 rotates relative to the first joint seat 1, causing the pin 43 to slide downwards within the straight groove 11. The first transmission plate 41 rotates relative to the second joint seat 2, and the pin 43 pulls the second transmission plate 43 downwards, causing the second transmission plate 42 to rotate relative to the third joint seat 3 and pull the third joint seat 3 towards the first joint seat 1. When unfolded, the second joint seat 2 is rotated in the opposite direction. The entire joint structure is simple and compact, allowing for flexible folding and unfolding.

[0049] like Figures 11 to 20As shown, the first transmission plate 41 is provided with a first clearance groove 51 that makes way for the connecting shaft 10 when it rotates; the second transmission plate 42 is provided with a second clearance groove 52 that makes way for the connecting shaft 10 when it rotates; the second joint seat 2 is provided with a third clearance groove 53 that makes way for the pin 10 when it rotates; and the third joint seat 3 is provided with a fourth clearance groove 54 that makes way for the pin 10 when it rotates. This design avoids interference and also provides a guiding function, making the unfolding or retracting movements flexible and smooth.

[0050] like Figure 12 and Figure 16 As shown, the locking device of the joint structure in this embodiment includes a radial groove 61 provided on the second joint seat 2 in the radial direction. A locking pin 62 capable of radial movement is provided within the radial groove 61. A first groove 63 is provided on the first joint seat 1 in the radial direction, capable of engaging with the locking pin 62. Both the left and right joint seats 32 and 33 are provided with third grooves 64 in the radial direction, capable of engaging with the locking pin 62. When the locking device is locked, the locking pin 62 engages simultaneously with the first groove 63 and the third groove 64. The first joint seat 1 is provided with… The system includes a first arc-shaped groove 65 that allows the locking pin 62 to move within the first slot 63 and the third slot 64 when it exits. The left and right seats 32 and 33 each have a third arc-shaped groove 66 that allows the locking pin 62 to move within the first slot 63 and the third slot 64 when it exits. The second joint seat 2 contains a sliding rod 67, on which the locking pin 62 is laterally fixed. A return spring 68 is provided between the sliding rod 67 and the second joint seat 2 to push the sliding rod 67 back to its original position. In this embodiment, to unlock, the sliding rod 67 is pushed downwards to disengage the locking pin 62 from the first slot 63 and the third slot 64. Figure 21 As shown, the locking device of the joint structure in this embodiment is suitable for the telescopic push rod assembly 72. When the push rod assembly 72 is retracted and folded, it can push the sliding rod 67 downward to unlock it. The telescopic push rod assembly 72 is prior art and will not be described in detail here.

[0051] like Figure 21As shown, a stroller includes the joint structure embodiment 2 described above. A rear leg 71 is connected to the first joint seat 1, a push rod assembly 72 is connected to the second joint seat 2, a front leg 73 is connected to the fixing rod 31, and wheels 74 are provided at the lower ends of the front leg 73 and the rear leg 71. A protruding connecting portion 34 is connected to the left seat body 32 and the right seat body 33, and a seat support 75 is connected to the connecting portion 34. The rear side of the seat support 75 is rotatably connected to the connecting portion 34, and the front side of the seat support 75 is connected to the front leg 71. A traction assembly 9 is provided between the three sections to pull the seat support 75 towards the front leg 73. The traction assembly 9 includes an upper connecting rod 91 rotatably connected to the seat support 75 at its upper end and a lower connecting rod 92 rotatably connected to the fixed rod 31 at its lower end. The upper end of the lower connecting rod 92 is rotatably connected to the lower end of the upper connecting rod 91. The traction assembly 9 also includes a linkage rod 93, the front end of which is rotatably connected to the lower end of the upper connecting rod 91, and the rear end of which is movably connected to the second joint seat 2. A foldable seat assembly 8 is connected to the seat support 75. When the push rod assembly 72 and the second joint seat 2 rotate towards the rear leg 71, the pin 43 pulls the third joint seat 3 to rotate through the second transmission plate 42, causing the front leg 73 to rotate towards the rear leg 71. During this process, the second joint seat 2 pulls the linkage rod 93, which in turn pulls the connection position of the upper connecting rod 91 and the lower connecting rod 92 to move backward, thereby causing the seat support 75 to move towards the front leg 73, thus realizing the folding of the stroller. It should be noted that before the aforementioned folding operation, the seat assembly 8 is folded first. The seat assembly 8 adopts existing technology and will not be described in detail here.

[0052] like Figure 12 , Figure 14 , Figure 15 , Figure 18 and Figure 20As shown, the second joint seat 2 is provided with an arc-shaped second arc groove 22 along the circumferential direction. The second arc groove 22 has a second starting end 22a and a second ending end 22b. The third joint seat 3 is provided with an arc-shaped third arc groove 35 along the circumferential direction. The third arc groove 35 has a third starting end 35a and a third ending end 35b. The rear end of the linkage rod 93 is provided with a movable shaft 94 that passes through the second arc groove 22 and the third arc groove 35. When the stroller is unfolded, the second ending end 22b and the third starting end 35a clamp the movable shaft 94 to position the linkage rod 93. During the rotation and folding process of the second joint seat 2 relative to the first joint seat 1, the second starting end 22a pushes the movable shaft 94 to move within the third arc groove 35, thereby causing the linkage rod 93 to pull the seat support 75 to fold. Specifically, in the unfolded state of the stroller, the second end point 22b and the third starting point 35a clamp the movable shaft 94, preventing the linkage rod 93 from moving and ensuring that the seat support 75 is positioned, preventing it from moving towards the front leg 73. When folded, as the second joint seat 2 rotates, the second end point 22b releases the movable shaft 94. After the second joint seat 2 continues to rotate backward at a certain angle, the second starting point 22a touches the movable shaft 94. During the subsequent rotation of the second joint seat 2, the second starting point 22a pushes the movable shaft 94 to move within the third arc groove 35. During this movement, the movable shaft 94 drives the linkage rod 93 backward, causing the upper connecting rod 91 and the lower connecting rod 92 to bring the seat support 75 towards the front leg 73, thus achieving the folding of the seat support 75 with the folded seat assembly 8 towards the front leg 73.

[0053] The embodiments described above with reference to the accompanying drawings have been described in detail. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A joint structure that can move from an unfolded position to a folded position after the locking device is unlocked, characterized in that: The system includes a first joint seat (1) and a second joint seat (2) rotatably connected to the first joint seat (1) about a first axis (A). The first joint seat (1) has a straight groove (11) in the radial direction. The second joint seat (2) is rotatably connected to a first transmission plate (41) off the first axis (A). The first transmission plate (41) is connected to a pin (43) that passes through the straight groove (11) and can slide in the straight groove (11) when the second joint seat (2) rotates relative to the first joint seat (1). The first joint seat (1) is also rotatably connected to a third joint seat (3) about a second axis (B). The third joint seat (3) is rotatably connected to a second transmission plate (42) off the second axis (B). The pin (43) is also connected to the second transmission plate (42) so that when the second joint seat (2) rotates closer to the first joint seat (1), the second transmission plate (42) can drive the third joint seat (3) to rotate closer to the first joint seat (1).

2. The joint structure according to claim 1, characterized in that: The first joint seat (1), the second joint seat (2) and the third joint seat (3) are rotatably connected to each other via a connecting shaft (10), and the first axis (A) and the second axis (B) are collinear and coincident, forming the axis of the connecting shaft (10).

3. The joint structure according to claim 1 or 2, characterized in that: The first transmission plate (41) is provided with a first clearance groove (51) for the connecting shaft (10) when it rotates, the second transmission plate (42) is provided with a second clearance groove (52) for the connecting shaft (10) when it rotates, the second joint seat (2) is provided with a third clearance groove (53) for the pin (43) when it rotates, and the third joint seat (3) is provided with a fourth clearance groove (54) for the pin (43) when it rotates.

4. The joint structure according to claim 1, characterized in that: The locking device includes a radial groove (61) on the second joint seat (2) in the radial direction, a locking pin (62) that can move radially is provided in the radial groove (61), a first groove (63) that can engage with the locking pin (62) in the radial direction is provided on the first joint seat (1), and a third groove (64) that can engage with the locking pin (62) in the radial direction is provided on the third joint seat (3). When the locking device is locked, the locking pin (62) engages with the first groove (63) and the third groove (64) simultaneously. The first joint seat (1) is provided with a locking pin (62) that can move radially when the locking pin (62) retracts. A first arc-shaped groove (65) is provided on the third joint seat (3) so that the locking pin (62) can move within it when it exits the first slot (63) and the third slot (64). A third arc-shaped groove (66) is provided on the third joint seat (3) so that the locking pin (62) can move within it when it exits the first slot (63) and the third slot (64). A sliding rod (67) is provided in the second joint seat (2). The locking pin (62) is fixed laterally on the sliding rod (67). A return spring (68) is provided between the sliding rod (67) and the second joint seat (2) so as to push the sliding rod (67) to slide back to its original position.

5. The joint structure according to claim 2, characterized in that: The third joint seat (3) includes a fixing rod (31). The upper end of the fixing rod (31) is provided with a left seat body (32) and a right seat body (33) spaced apart from each other. The second transmission plate (42) is connected to both the left seat body (32) and the right seat body (33). The second joint seat (2) is located between the left seat body (32) and the right seat body (33). There are two first joint seats (1). One first joint seat (1) is located outside the left seat body (32), and the other first joint seat (1) is located outside the right seat body (33). There are two first transmission plates (41), both of which are connected to the first joint seat (1). The connecting shaft (10) passes through the first joint seat (1), the left seat body (32), the second joint seat (2), and the right seat body (33).

6. The joint structure according to claim 5, characterized in that: The first transmission plate (41) is provided with a first clearance groove (51) for the connecting shaft (10) when it rotates, the second transmission plate (42) is provided with a second clearance groove (52) for the connecting shaft (10) when it rotates, the second joint seat (2) is provided with a third clearance groove (53) for the pin (43) when it rotates, and the third joint seat (3) is provided with a fourth clearance groove (54) for the pin (43) when it rotates.

7. The joint structure according to claim 6, characterized in that: The locking device includes a radial groove (61) on the second joint seat (2) in the radial direction, a locking pin (62) that can move radially is provided in the radial groove (61), a first slot (63) that can engage with the locking pin (62) is provided on the first joint seat (1) in the radial direction, and a third slot (64) that can engage with the locking pin (62) is provided on both the left seat body (32) and the right seat body (33) in the radial direction. When the locking device is locked, the locking pin (62) engages with the first slot (63) and the third slot (64) simultaneously. The first joint seat (1) is provided with a locking pin (62) that can move radially when the locking pin (62) retracts. A first arc-shaped groove (65) is provided to allow the locking pin (62) to move within when it exits the first slot (63) and the third slot (64). The left seat (32) and the right seat (33) are provided with a third arc-shaped groove (66) to allow the locking pin (62) to move within when it exits the first slot (63) and the third slot (64). The second joint seat (2) is provided with a sliding rod (67) that can slide. The locking pin (62) is horizontally fixed on the sliding rod (67). A return spring (68) is provided between the sliding rod (67) and the second joint seat (2) to push the sliding rod (67) to slide back to its original position.

8. A child stroller, characterized in that: The device includes two symmetrically arranged joint structures as described in any one of claims 1 to 4, each of the first joint seats (1) being connected to a rear leg (71), each of the second joint seats (2) being connected to a push rod assembly (72), each of the third joint seats (3) being connected to a front leg (73), each of the front leg (73) and the rear leg (71) having a wheel (74) at its lower end, and the third joint seat (3) having a foldable seat assembly (8) on its inner side.

9. A child stroller, characterized in that: The joint structure includes the joint structure as described in any one of claims 5 to 7, wherein a rear leg (71) is connected to the first joint seat (1), a push rod assembly (72) is connected to the second joint seat (2), a front leg (73) is connected to the fixing rod (31), and wheels (74) are provided at the lower ends of the front leg (73) and the rear leg (71). A protruding connecting portion (34) is connected to the left seat body (32) and the right seat body (33), and a seat support member (75) is connected to the connecting portion (34). The rear side of the seat support member (75) is rotatably connected to the connecting portion (34), and the front side of the seat support member (75) is connected to the front leg (73). A traction assembly (9) is provided to pull the seat support (75) towards the front leg (73). The traction assembly (9) includes an upper connecting rod (91) rotatably connected to the seat support (75) at its upper end and a lower connecting rod (92) rotatably connected to the fixed rod (31) at its lower end. The upper end of the lower connecting rod (92) is rotatably connected to the lower end of the upper connecting rod (91). The traction assembly (9) also includes a linkage rod (93). The front end of the linkage rod (93) is rotatably connected to the lower end of the upper connecting rod (91), and the rear end of the linkage rod (93) is movably connected to the second joint seat (2). A foldable seat assembly (8) is connected to the seat support (75).

10. The stroller according to claim 9, characterized in that: The second joint seat (2) is provided with an arc-shaped second arc groove (22) along the circumferential direction. The second arc groove (22) has a second starting end (22a) and a second ending end (22b). The third joint seat (3) is provided with an arc-shaped third arc groove (35) along the circumferential direction. The third arc groove (35) has a third starting end (35a) and a third ending end (35b). The rear end of the linkage rod (93) is provided with a movable shaft (94) that passes through the second arc groove (22) and the third arc groove (35). When the stroller is unfolded, the second ending end (22b) and the third starting end (35a) clamp the movable shaft (94) to position the linkage rod (93). During the rotation and folding process of the second joint seat (2) relative to the first joint seat (1), the second starting end (22a) pushes the movable shaft (94) to move in the third arc groove (35) so that the linkage rod (93) pulls the seat support (75) to fold.

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