A foldable joint and foldable baby stroller

Abstract

The present invention provides a folding joint and a folding baby stroller, wherein the folding joint comprises: an upper joint, a lower joint rotatably connected to the upper joint, and both of them have an unfolded position and a folded position; a first connecting part provided on the upper joint, a locking member A linked to the first connecting part; a second connecting part provided on the lower joint, a locking member B linked to the first connecting part; the locking members A and B are relatively close to or away from each other as the upper joint and the lower joint rotate relative to each other, and when the first connecting part and the second connecting part are both in the unfolded position, the locking members A and B are relatively close to each other and can be locked together. After unlocking, the first connecting part and the second connecting part rotate relative to each other under the action of gravity to reach the folded position, and drive the push rod assembly, the supporting leg folding joint, and the front and rear legs to enter the folded position, which is convenient and quick, and easy to operate.

Description

Technical Field

[0001] The present invention relates to the field of baby strollers, and in particular to a folding joint and a foldable baby stroller. Background Art

[0002] Existing baby strollers are generally foldable, so as to save space and be easy to carry. However, the folding mechanism of existing baby strollers is not designed properly, which makes the folding operation very complicated, time-consuming and labor-intensive, and it is impossible to fold the stroller with one hand;

[0003] In addition, existing baby strollers take up a large space and are inconvenient to use in crowded places such as hospitals and buses. Folding baby strollers are industrial products with highly integrated parts. Simply reducing them proportionally may easily lead to the inability to smoothly fold and unfold them. Moreover, foldable baby strollers need to be locked by a locking device after unfolding. In places with large traffic flow, the number and frequency of collisions with baby strollers due to pushing and crowding by people increase significantly, and the requirements for the locking mechanism of baby strollers will be higher, which is also one of the tests for existing baby strollers. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a folding joint and a foldable baby stroller, which can reduce the space occupied by the baby stroller, facilitate folding, and improve safety performance.

[0005] According to one aspect of the present invention, there is provided a folding joint, comprising:

[0006] An upper joint, and a lower joint rotatably connected to the upper joint, and both of them have an extended position and a retracted position;

[0007] A first connecting portion provided on the upper joint, and a locking member A linked to the first connecting portion;

[0008] A second connecting portion provided on the lower joint, and a locking member B linked to the first connecting portion;

[0009] The locking member A and the locking member B are relatively close to or far away from each other as the upper joint and the lower joint rotate relative to each other, and when the first connecting part and the second connecting part are both in the unfolded position, the locking member A and the locking member B are relatively close to each other and can be locked together.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the locking member A and the locking member B are relatively close to or far away from each other with the relative rotation of the upper joint and the lower joint, and when the first connecting part and the second connecting part are both in the expanded position, the locking member A and the locking member B are relatively close to each other and can be locked together, so that the first connecting part and the second connecting part can be in the expanded position at the same time. When they need to be folded, only the locking member A and the locking member B need to be unlocked, which is easy to operate.

[0011] Preferably, after the locking members A and B are unlocked, the first connecting part and the second connecting part can be rotated by the upper joint and the lower joint and move to the folded position at the same time, and drive the locking members A and B to move relatively away.

[0012] The beneficial effect of adopting the above-mentioned preferred scheme is that the first connecting part and the second connecting part can be moved to the folded position at the same time through the rotation of the upper joint and the lower joint, driving the locking part A and the locking part B to move relatively away from each other to create a folding space for the upper joint and the lower joint, avoiding the locking part A or the locking part B from hindering the folding of the joint, which is conducive to the folded joint to quickly reach a stable state.

[0013] Preferably, the upper joint is provided with a first stop portion;

[0014] The lower joint is provided with a second stop portion;

[0015] When the first stop portion contacts the second stop portion, the first connecting portion and the second connecting portion both move to the folded position.

[0016] The beneficial effect of adopting the above-mentioned preferred scheme is that when the first stop portion contacts the second stop portion, the first connecting portion and the second connecting portion both move to the retracted position, and the contact surfaces of the first stop portion and the second stop portion can be designed so that the angle between the upper joint and the lower joint after they are retracted can be controlled, thereby avoiding mutual squeezing of the upper joint and the lower joint.

[0017] Preferably, it also includes a movable joint;

[0018] The lower joint is located on one side of the upper joint, and the movable joint is located on the other side of the upper joint;

[0019] The lower joint, the upper joint and the movable joint are pivotally connected together via a pivot axis;

[0020] A gear is connected to one side of the movable joint close to the upper joint, and the upper joint is provided with a tooth groove matched with the gear. The gear and the tooth groove cooperate to enable the movable joint to have several extended positions and retracted positions;

[0021] After the gear rotates, it is disengaged from the tooth groove, and the movable joint can be rotated to one of the unfolded positions or rotated to the folded position.

[0022] The beneficial effect of adopting the above-mentioned preferred scheme is that the relative rotation of the lower joint and the upper joint will not affect the movable joint, and the rotation of the movable joint will not affect the lower joint and the upper joint, so that the movable joint can move independently, while reducing the activity space required for the three to cooperate with each other.

[0023] Preferably, the first connecting portion is connected to a supporting rod;

[0024] The locking member A is located on the support rod, and according to the different axial positions of the locking member A on the support rod, there are a locking position and an unlocking position, and the unlocking position is located above the locking position;

[0025] The unlocking mechanism limits the locking member A from moving on the support rod, and the external force along the axial direction of the support rod can drive the locking member A to move from the locked position to the unlocked position through the unlocking mechanism.

[0026] The beneficial effect of adopting the above-mentioned preferred scheme is that the axial external force along the support rod can drive the locking member A to move from the locked position to the unlocked position through the unlocking mechanism. The movement of the locking member A from the locked position to the unlocked position requires the cooperation of the unlocking mechanism, thereby increasing the locking stability of the locking members A and B and preventing the locking members A and B from being unlocked due to impact.

[0027] Preferably, the locking member B is provided with a locking groove matched with the locking member A. When the locking member A and the locking member B are relatively close, the locking member A is inserted into the locking groove. The locking groove can limit the locking member A and the locking member B from being relatively far away. To facilitate the locking member A to be inserted into the locking groove, a guiding inclined surface is provided on the side of the locking member B close to the second stop portion.

[0028] The beneficial effect of adopting the above preferred solution is that, in combination with the first stop portion 13 and the second stop portion 23, the upper and lower joints 2 are limited when the folding joint is folded.

[0029] or

[0030] The first sleeve is sleeved on the outside of the support rod, the support rod is connected to the first connecting part through the first sleeve, a limiting column is arranged between the first sleeve and the first connecting part, and a clearance groove for the rotation of the lower joint is arranged at the bottom end of the first sleeve.

[0031] The beneficial effect of adopting the above preferred solution is that:

[0032] Preferably, the support rod is hollow; the unlocking mechanism comprises a fixed seat and a movable seat arranged in the support rod, and a first elastic member is provided between the fixed seat and the movable seat.

[0033] The movable seat is connected to the locking member A. When an axial external force along the support rod and toward the unlocking position acts on the movable seat, the movable seat squeezes the first elastic member to drive the locking member A to move from the locking position to the unlocking position.

[0034] The beneficial effect of adopting the above-mentioned preferred scheme is that unlocking can be completed only when the locking member A moves from the locking position to the unlocking position, allowing the locking member A to move between the locking position and the unlocking position under the extrusion of the first elastic member, thereby avoiding unlocking caused by external force interference.

[0035] According to one aspect of the present invention, there is provided a foldable baby carriage frame, comprising any one of the folding joints described above;

[0036] The top of the support rod connected to the first connection part is connected via a push rod assembly, the bottom end of the support rod is hinged with a seat support rod, and the seat support rod is rotatably connected with a seat assembly;

[0037] An armrest connecting rod connected to the second connecting portion, wherein the bottom end of the armrest connecting rod is hingedly connected to a support leg folding joint;

[0038] The end of the support leg folding joint away from the armrest connecting rod is hingedly connected to the front leg, the front leg is rotatably connected to the footrest rod, and the footrest rod is hingedly connected to the end of the seat support rod away from the support rod;

[0039] The middle part of the support leg folding joint is connected to the rear leg, and the rear leg is rotatably connected to the seat support rod. When the first connection part and the second connection part are both in the unfolded position, the front leg, rear leg and support leg folding joint are distributed in a "T"-shaped structure.

[0040] Compared with the prior art, the present invention has the following beneficial effects: the locking members A and B are locked together, the push rod assembly, the support leg folding joint and the front and rear legs are also rotated and moved to the unfolded position, the upper joint and the lower joint cannot fold spontaneously, and the foldable baby carriage frame is unfolded; after unlocking, the first connecting part and the second connecting part rotate relative to each other under the action of gravity to reach the folded position, and drive the push rod assembly, the support leg folding joint and the front and rear legs to enter the folded position, which is convenient and fast, and easy to operate.

[0041] Preferably, a support rod is rotatably connected to the seat assembly, and the other end of the support rod is rotatably connected to the rear leg;

[0042] When the foldable baby carriage frame is unfolded, the connection between the seat rod and the seat assembly is located in front of the support leg folding joint, the connection between the seat rod and the rear leg is located behind the support leg folding joint, and the connection between the seat rod and the seat assembly is located above the connection between the seat rod and the rear leg.

[0043] The beneficial effect of adopting the above preferred solution is that the support rod does not increase the occupied space, the support rod can increase the stability of the seat assembly when the foldable baby carriage frame is unfolded, and does not hinder the seat assembly from rotating relative to the seat support rod when folded.

[0044] Preferably, an armrest is rotatably connected to the armrest connecting rod, a distal end of the armrest is rotatably connected to a limiting rod, and an end of the limiting rod away from the armrest is rotatably connected to a seat supporting rod.

[0045] The beneficial effect of adopting the above preferred solution is that when the foldable baby stroller frame is unfolded, the armrests will not rotate, which is convenient for the baby to hold or for the guardian to carry the baby stroller.

[0046] Preferably, a car collecting box and an unlocking button are provided on the push rod assembly, and the unlocking button is movably connected to the car collecting box. The car collecting box is provided with an unlocking button movable hole, and a guide groove is provided on the unlocking button movable hole. The guide groove is slidably connected to a car collecting movable seat, and the car collecting movable seat is connected to a car collecting traction rope, and the locking member A and the locking member B are controlled to release the lock through the car collecting traction rope.

[0047] The beneficial effect of adopting the above preferred solution is that the locking member A and the locking member B are unlocked by controlling the vehicle folding traction rope, and the unlocking button is located on the push rod assembly, which can make the folding operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The structure of the folding joint of the present invention is shown in FIG. Figure 1 ;

[0049] Figure 2 The structure of the folding joint of the present invention is shown in FIG. Figure 2 ;

[0050] Figure 3 It is a structural diagram of the lower joint;

[0051] Figure 4 is a schematic diagram of the structure of the push rod assembly;

[0052] Figure 5 It is a structural schematic diagram of the car collection box;

[0053] Figure 6 is a structural schematic diagram of the support rod;

[0054] Figure 7 It is a structural diagram of the movable joint;

[0055] Figure 8 Schematic diagram of the upper joint structure Figure 1 ;

[0056] Fig. 9 Schematic diagram of the upper joint structure Figure 2 ;

[0057] Fig.10 Schematic diagram of the unfolded structure of the foldable baby carriage frame;

[0058] Fig.11 It is a structural schematic diagram of a foldable baby carriage frame from an unfolded to a folded intermediate state;

[0059] Fig.12 It is a structural schematic diagram of the foldable baby stroller frame in the intermediate state of folding.

[0060] Numbers shown in the accompanying drawings: 1-upper joint; 11-first connecting part; 12-locking member A; 13-first stop part; 14-locking member C; 15-locking member D; 16-first clamping seat; 17-second clamping seat; 2-lower joint; 21-second connecting part; 22-locking member B; 23-second stop part; 3-movable joint; 31-gear; 32-tooth groove; 4-support rod; 41-first sleeve; 42-slide groove; 43-limiting column; 44-allowing groove; 51-fixed seat; 52-movable seat; 53-first elastic member; 54-second sleeve ;6-push rod assembly;60-second elastic member;61-car folding box;62-unlocking button;63-guide groove;64-car folding movable seat;65-car folding traction rope;66-limiting slider;67-limiting block;68-unlocking hole;69-external button;7-seat support rod;8-seat assembly;81-support rod;82-first vertical rod;83-second vertical rod;84-diagonal rod;9-armrest connecting rod;91-armrest;92-limiting rod;100-support leg folding joint;110-front leg;111-pedal rod;120-back leg. DETAILED DESCRIPTION

[0061] In order to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments.

[0062] Example 1

[0063] A folding joint comprises an upper joint 1 and a lower joint 2 rotatably connected to the upper joint 1, and both of the upper joints have an extended position and a folded position;

[0064] A first connecting portion 11 provided on the upper joint 1, and a locking member A12 linked to the first connecting portion 11;

[0065] A second connecting portion 21 provided on the lower joint 2, and a locking member B22 linked to the first connecting portion 11;

[0066] The locking members A12 and B22 are relatively close to or far away from each other with the relative rotation of the upper joint 1 and the lower joint 2, and when the first connection part 11 and the second connection part 21 are both in the expanded position, the locking members A12 and B22 are relatively close to each other and can be locked together; after the locking members A12 and B22 are unlocked, the first connection part 11 and the second connection part 21 can be moved to the folded position at the same time through the rotation of the upper joint 1 and the lower joint 2, and drive the locking members A12 and B22 to be relatively far away from each other, the upper joint 1 is provided with a first stop part 13; the lower joint 2 is provided with a second stop part 23; when the first stop part 13 is in contact with the second stop part 23, the first connection part 11 and the second connection part 21 are both moved to the folded position.

[0067] It also includes a movable joint 3, wherein the lower joint 2 is located on one side of the upper joint 1, and the movable joint 3 is located on the other side of the upper joint 1, and the lower joint 2, the upper joint 1, and the movable joint 3 are pivotally connected together through a pivot axis;

[0068] The movable joint 3 is connected to a gear 31 on one side close to the upper joint 1. The upper joint 1 is provided with a tooth groove 32 matched with the gear 31. The gear 31 cooperates with the tooth groove 32 so that the movable joint 3 has several unfolded positions and folded positions.

[0069] After the gear 31 rotates, it disengages from the tooth groove 32 , driving the movable joint 3 to move relative to the upper joint 1 . The movable joint 3 can rotate to one of the extended positions or the retracted position.

[0070] The first connecting portion 11 is connected to the support rod 4, and the locking member A12 is located on the support rod 4. According to the different axial positions of the locking member A12 on the support rod 4, there are a locking position and an unlocking position, and the unlocking position is located above the locking position. As an optional solution, in order to facilitate the installation and disassembly of the support rod 4, a first sleeve 41 is arranged outside the support rod 4, and the support rod 4 is connected to the first connecting portion 11 through the first sleeve 41, and a limiting column 43 is provided between the first sleeve 41 and the first connecting portion 11, and a clearance groove 44 for the rotation of the lower joint 2 is provided at the bottom end of the first sleeve 41, which cooperates with the first stop portion 13 and the second stop portion 23 to limit the upper and lower joints 2 when the joints are folded;

[0071] The unlocking mechanism limits the movement of the locking piece A12 on the support rod 4, and the axial external force along the support rod 4 can drive the locking piece A12 to move from the locked position to the unlocked position through the unlocking mechanism. Furthermore, the support rod 4 is hollow; the unlocking mechanism includes a fixed seat 51 and a movable seat 52 arranged in the support rod 4, and a first elastic piece 53 is provided between the fixed seat 51 and the movable seat 52 for connection, and the movable seat 52 is connected to the locking piece A12. In this embodiment, the first elastic piece 53 is a spring, and the two ends of the movable seat 52 extend out of the support rod 4 and are connected to the locking piece A12. The side wall of the support rod 4 is axially provided with a sliding groove 42 that matches the movable seat 52. As an optional scheme, a second sleeve 54 is arranged on the outer shell of the support rod 4, and the second sleeve 54 is connected to the movable seat 52; when an axial external force along the support rod 4 and toward the unlocking position acts on the movable seat 52, the movable seat 52 squeezes the first elastic piece 53 to drive the locking piece A12 to move from the locked position to the unlocking position.

[0072] The present embodiment provides a foldable baby stroller frame using the above-mentioned folding joints, including any one of the folding joints described above. To increase the convenience of folding, two folding joints are relatively arranged for folding and unfolding the foldable baby stroller frame.

[0073] The top of the support rod 4 connected to the first connecting part 11 is connected through a push rod assembly 6, and a car collecting box 61 and an unlocking button 62 are arranged on the push rod assembly 6, and the unlocking button 62 is movably connected to the car collecting box 61, and the car collecting box 61 is provided with an unlocking button 62 movable hole, and a guide groove 63 is arranged on the unlocking button 62, and the guide groove 63 is slidably connected to the car collecting movable seat 64, and the car collecting movable seat 64 is connected to a car collecting traction rope 65. As an optional solution, a safety lock is arranged on the top of the car collecting box 61, and the safety lock includes a limiting slider 66, and a limiting block 67 is arranged on the limiting slider 66, and the limiting block 67 has an unlocking position and a locking position, and an unlocking hole 68 matching the limiting block 67 is arranged on the unlocking button 62, and when the limiting block 67 is in the unlocking position, pressing the unlocking button 62 can make the limiting The block 67 slides into the unlocking hole 68, and the unlocking button 62 slides upward to drive the locking member A12 and the locking member B22 to unlock; further, a connecting seat is provided on the limit slider 66, and the connecting seat extends out of the car receiving box 61 and is provided with an external button 69. The left end and / or the right end of the limit slider 66 is connected to the car receiving box 61 through a second elastic member 60, and the second elastic member 60 is preferably a spring. The second elastic member 60 uses elastic force to keep the limit slider 66 in the locked position, drives the limit slider 66 to compress the second elastic member 60, and the limit slider 66 moves to the unlocking position. The movable seat 52 squeezes the first elastic member 53 to drive the locking member A12 to move from the locked position to the unlocking position. The unlocking button 62 drives the movable seat 52 to squeeze the first elastic member 53 to drive the locking member A12 to move from the locked position to the unlocking position. In this embodiment, the other end of the traction rope is connected to the movable seat 52, and the locking member A12 and the locking member B22 are unlocked by controlling the traction rope 65 for collecting the car. Specifically, in this embodiment, the locking member B22 is provided with a locking groove that matches the locking member A12. When the locking members A12 and B22 are relatively close, the locking member A12 is inserted into the locking groove. The locking groove can limit the locking members A12 and B22 from being relatively far away. To facilitate the locking member A12 to be inserted into the locking groove, a guiding inclined surface is provided on the side of the locking member B22 close to the second stop portion 23. After the locking members A12 and B22 are locked, the locking member A12 cannot move upward under the pressure of the spring, so that the two are locked together. The bottom end of the support rod 4 is hinged with a seat support rod 7, and the seat support rod 7 is rotatably connected to the seat assembly 8; the seat assembly 8 is rotatably connected to a support rod 81, and the other end of the support rod 81 is rotatably connected to the rear leg 120.

[0074] The armrest connecting rod 9 connected to the second connecting portion 21 has a support leg folding joint 100 hinged at its bottom end; an armrest 91 is rotatably connected to the armrest connecting rod 9, and the end of the armrest 91 is rotatably connected to a limit rod 92, and the end of the limit rod 92 away from the armrest 91 is rotatably connected to the seat support rod 7. In this embodiment, in order to avoid the support rod 81 from colliding with other mechanisms (especially the support leg folding joint 100) when the car is folded or displayed, the support rod 81 includes a first vertical rod 82 and a second vertical rod 83, and the first vertical rod 82 and the second vertical rod 83 are connected by an inclined rod 84. When in use, the first vertical rod 82 is close to the seat assembly 8, and a space is formed between the seat assembly 8 and the first vertical rod 82 for the first vertical rod 82 and the support leg folding joint 100 to rotate relative to each other.

[0075] The movable joint 3 is used to install the cape. The movable joint 3 can be rotated to one of the unfolded positions or to the folded position, which can facilitate the user to adjust the area of ​​the seat rod assembly covered by the cape. At the same time, a socket can be optionally set in the limit column 43 for plugging the supporting keel in the middle of the cape of the foldable baby stroller frame.

[0076] The end of the support leg folding joint 100 away from the armrest connecting rod 9 is hingedly connected to the front leg 110, and the front leg 110 is rotatably connected to the footrest rod 111, and the footrest rod 111 is hingedly connected to the end of the seat support rod 7 away from the support rod 4;

[0077] The middle part of the support leg folding joint 100 is connected to the rear leg 120, and the rear leg 120 is rotatably connected to the seat support rod 7. When the first connecting part 11 and the second connecting part 21 are both in the unfolded position, the front leg 110, the rear leg 120, and the support leg folding joint 100 are distributed in a "T"-shaped structure.

[0078] When the foldable baby carriage frame is unfolded, the connection between the seat rod 81 and the seat assembly 8 is located in front of the support leg folding joint 100, the connection between the seat rod 81 and the rear leg 120 is located behind the support leg folding joint 100, and the connection between the seat rod 81 and the seat assembly 8 is located above the connection between the seat rod 81 and the rear leg 120;

[0079] As an optional solution, a locking member C14 is provided on the armrest connecting rod 9, one end of the locking member C14 is rotatably connected to the armrest connecting rod 9, and the other end is provided with a first slot, and a first holder 16 matching the first slot is provided on the support rod 4 or the seat support rod 7; a locking member D15 is provided on the push rod assembly 6, and a second slot is provided on the locking member D15, and a second holder 17 matching the second slot is provided on the rear leg 120. Figure 10-12As shown, when the first connection part 11 and the second connection part 21 are both in the expanded position, the locking member C14 rotates clockwise, and the first slot and the first socket 16 can be relatively close and buckled together. When opened, the locking member C14 rotates counterclockwise, which is opposite to the direction of the locking member A12 and the locking member B22 when they are opened, thereby increasing the stability of the frame in the expanded state and preventing the frame from being accidentally folded due to collision; when the first connection part 11 and the second connection part 21 are both in the folded position, the locking member D15 rotates clockwise or counterclockwise, and the second slot and the second socket 17 can be relatively close and buckled together, thereby limiting the rotation of each mechanism and facilitating carrying.

[0080] The process of folding and unfolding the frame: when folding the vehicle, if the first slot and the first socket 16 are engaged, first disengage the first slot and the first socket 16, and then press the unlocking button 62 to control the movement of the vehicle folding movable seat 64, and pull the locking member A12 through the traction rope, the locking member A12 and the locking member B22 are unlocked, and the center of gravity of the push rod assembly 6, the support rod 4, the seat support rod 7, the seat assembly 8, and the armrest connecting rod 9 move downward under the action of gravity, the push rod assembly 6 and the support rod 4 rotate counterclockwise toward the rear leg 120, the seat support rod 7 and the armrest connecting rod 9 rotate clockwise toward the rear leg 120, and at the same time, the armrest connecting rod 9 pulls the front leg 110 toward the rear leg 120, and the armrest connecting rod 9 pulls the seat assembly 8 toward the rear leg 120, thereby completing the folding of the vehicle.

[0081] When the frame is unfolded, if the second slot and the second socket 17 are engaged, the second slot and the second socket 17 are first disengaged, and the push rod assembly 6 is lifted upward, and the relevant mechanism rotates in the opposite direction of the vehicle folding four. When the first connecting part 11 and the second connecting part 21 both reach the unfolded position, the locking member A12 and the locking member B22 are automatically locked together to form an unfolded frame.

[0082] Example 2

[0083] The present embodiment provides a foldable baby stroller frame, and the same parts as the previous embodiment are not repeated here. The difference lies in that a rear wheel brake assembly is provided on the rear legs 120 to increase the standing stability of the baby stroller frame, and a telescopic rod is provided at the bottom of the seat assembly 8. A handle is provided at one end of the telescopic rod away from the support rod 4. When the frame is folded, the telescopic rod is unfolded for easy carrying.

[0084] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A folding joint, characterized in that: include: An upper joint, and a lower joint rotatably connected to the upper joint, and both of them have an extended position and a retracted position; A first connecting portion provided on the upper joint, and a locking member A linked to the first connecting portion; A second connecting portion provided on the lower joint, and a locking member B linked to the first connecting portion; The locking member A and the locking member B are relatively close to or far away from each other as the upper joint and the lower joint rotate relative to each other, and when the first connecting part and the second connecting part are both in the unfolded position, the locking member A and the locking member B are relatively close to each other and can be locked together; After the locking member A and the locking member B are unlocked, the first connecting part and the second connecting part can be rotated by the upper joint and the lower joint and simultaneously moved to the folded position, and drive the locking member A and the locking member B to move relatively away; The upper joint is provided with a first stop portion; The lower joint is provided with a second stop portion; When the first stop portion contacts the second stop portion, the first connecting portion and the second connecting portion both move to the retracted position; The folding joint also includes a movable joint; The lower joint is located on one side of the upper joint, and the movable joint is located on the other side of the upper joint; The lower joint, the upper joint and the movable joint are pivotally connected together via a pivot axis; A gear is connected to one side of the movable joint close to the upper joint, and the upper joint is provided with a tooth groove matched with the gear. The gear and the tooth groove cooperate to enable the movable joint to have several extended positions and retracted positions; After the gear rotates, it disengages from the tooth groove, and the movable joint can rotate to one of the extended positions or rotate to the retracted position; The first connecting portion is connected to a supporting rod; The locking member A is located on the support rod, and according to the different axial positions of the locking member A on the support rod, there are a locking position and an unlocking position, and the unlocking position is located above the locking position; The unlocking mechanism restricts the locking member A from moving on the support rod, and the external force along the axial direction of the support rod can drive the locking member A to move from the locked position to the unlocked position through the unlocking mechanism; The locking member B is provided with a locking groove matched with the locking member A. When the locking members A and B are relatively close to each other, the locking member A is inserted into the locking groove. The locking groove can limit the locking members A and B from being relatively far away. To facilitate the locking member A to be inserted into the locking groove, a guiding inclined surface is provided on the side of the locking member B close to the second stop portion. The first sleeve is sleeved on the outside of the support rod, the support rod is connected to the first connecting part through the first sleeve, a limiting column is provided between the first sleeve and the first connecting part, and a clearance groove for the rotation of the lower joint is provided at the bottom of the first sleeve; The support rod is hollow; the unlocking mechanism includes a fixed seat and a movable seat arranged in the support rod, and a first elastic member is provided between the fixed seat and the movable seat. The movable seat is connected to the locking member A. When an axial external force along the support rod and toward the unlocking position acts on the movable seat, the movable seat squeezes the first elastic member to drive the locking member A to move from the locking position to the unlocking position.

2. A foldable baby stroller frame, characterized in that: The folding joint comprises the folding joint of claim 1; The top of the support rod connected to the first connection part is connected via a push rod assembly, the bottom end of the support rod is hinged with a seat support rod, and the seat support rod is rotatably connected with a seat assembly; An armrest connecting rod connected to the second connecting portion, wherein the bottom end of the armrest connecting rod is hingedly connected to a support leg folding joint; The end of the support leg folding joint away from the armrest connecting rod is hingedly connected to the front leg, the front leg is rotatably connected to the footrest rod, and the footrest rod is hingedly connected to the end of the seat support rod away from the support rod; The middle part of the support leg folding joint is connected to the rear leg, and the rear leg is rotatably connected to the seat support rod. When the first connection part and the second connection part are both in the unfolded position, the front leg, rear leg and support leg folding joint are distributed in a "T"-shaped structure.

3. The foldable baby stroller frame according to claim 2, characterized in that: A support rod is rotatably connected to the seat assembly, and the other end of the support rod is rotatably connected to the rear leg; When the foldable baby carriage frame is unfolded, the connection between the seat rod and the seat assembly is located in front of the support leg folding joint, the connection between the seat rod and the rear leg is located behind the support leg folding joint, and the connection between the seat rod and the seat assembly is located above the connection between the seat rod and the rear leg.

4. The foldable baby stroller frame according to claim 2, characterized in that: The armrest connecting rod is rotatably connected with an armrest, the end of the armrest is rotatably connected with a limiting rod, and one end of the limiting rod away from the armrest is rotatably connected with a seat supporting rod.

5. The foldable baby stroller frame according to claim 2, characterized in that: A car collecting box and an unlocking button are provided on the push rod assembly, and the unlocking button is movably connected to the car collecting box. The car collecting box is provided with an unlocking button movable hole, and a guide groove is provided on the unlocking button movable hole. The guide groove is slidably connected to a car collecting movable seat, and the car collecting movable seat is connected to a car collecting traction rope, and the locking member A and the locking member B are controlled to be unlocked by the car collecting traction rope.

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