Stroller framework

Abstract

A bottom supporting frame comprises a rear supporting rod, rear wheels are arranged at the lower end of the rear supporting rod, a rear support is arranged at the upper end of the rear supporting rod, a front supporting rod is rotatably connected to the rear support around a first axis, and a front wheel is connected to the lower end of the front supporting rod; a push rod assembly is rotatably connected to the bottom supporting frame around a second axis, and a linkage assembly capable of driving the front supporting rod and the rear supporting rod to rotate and draw close when the push rod assembly rotates and is folded relative to the rear supporting rod is further arranged between the push rod assembly and the bottom supporting frame. The bottom supporting frame is further rotatably connected with an armrest base around a third axis, the armrest base is connected with an armrest, and a transmission rod capable of driving the armrest base and the armrest to rotate and be folded relative to the rear supporting rod when the front supporting rod and the rear supporting rod rotate and draw close is arranged between the armrest base and the linkage assembly. The folding chair is simple in structure, smooth in folding and small in size after being folded.

Description

TECHNICAL FIELD

[0001] The present application relates to a child stroller frame. BACKGROUND

[0002] The child stroller is a common product in the process of child growth. The current child stroller can generally be unfolded or folded, and in the unfolded state, it is used for children to travel, and in the folded state, it is convenient to carry or store. The structures of the child stroller frames on the market are various, and the folding principles are different. Therefore, the present application provides a new child stroller frame different from the existing child stroller frame. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provide a child stroller frame which is simple in structure, smooth in folding, and small in volume after folding.

[0004] The present application is achieved by the following technical solutions:

[0005] A child stroller frame can be moved from an unfolded position to a folded position after the locking device is unlocked, comprising a bottom support frame, the bottom support frame comprises a rear support rod, the lower end of the rear support rod is provided with a rear wheel, the upper end of the rear support rod is provided with a rear support seat, the front support rod is rotatably connected to the rear support seat around a first axis, the lower end of the front support rod is connected with a front wheel, the bottom support frame is rotatably connected with a push rod assembly around a second axis, the push rod assembly and the bottom support frame are further provided with a linkage assembly which can drive the front support rod and the rear support rod to rotate and close when the push rod assembly is folded relative to the rear support rod, the bottom support frame is further rotatably connected with a handrail seat around a third axis, the handrail seat is connected with a handrail, and the handrail seat and the linkage assembly are provided with a transmission rod which can drive the handrail seat and the handrail to rotate and fold relative to the rear support rod when the front support rod and the rear support rod rotate and close.

[0006] The upper end of the transmission rod is rotatably connected to the handrail seat around a fourth axis and deviates from the third axis, and the lower end of the transmission rod is rotatably connected to the linkage assembly.

[0007] The child stroller frame further comprises a seat frame, the seat frame comprises a front side frame and a rear side frame rotatably connected to the rear end of the front side frame around a tenth axis, the middle part of the rear side frame is rotatably connected to the rear support seat around an eleventh axis, the front side of the front side frame and the linkage assembly are provided with a front connecting rod which can drive the front side frame and the rear side frame to rotate and fold when the front support rod and the rear support rod rotate and close, the upper end of the front connecting rod is rotatably connected to the front side frame around a thirteenth axis, and the lower end of the front connecting rod is rotatably connected to the linkage assembly around a twelfth axis.

[0008] The linkage assembly comprises a first linkage rod, a second linkage rod and a third linkage rod, the front end of the first linkage rod is rotatably connected with the front support rod around the fifth axis, the rear end of the second linkage rod is rotatably connected with the rear support rod around the sixth axis, the rear end of the first linkage rod is rotatably connected with the front end of the second linkage rod around the seventh axis, the upper end of the third linkage rod is rotatably connected with the push rod assembly around the eighth axis, the lower end of the third linkage rod is rotatably connected with the first linkage rod or the second linkage rod around the ninth axis, and the transmission rod and the lower end of the front connecting rod are rotatably connected on the first linkage rod.

[0009] The push rod assembly and the handrail seat are coaxially and rotatably connected on the rear support.

[0010] The transmission rod, the front connecting rod and the first linkage rod are coaxially and pivotally connected around the twelfth axis, and the push rod assembly, the handrail seat, the rear support and the rear side frame are coaxially and pivotally connected.

[0011] The push rod assembly comprises a lower push rod and an upper push rod rotatably connected with the lower push rod, the lower end of the lower push rod is provided with a push rod seat, the push rod seat is rotatably connected with the rear support around the second axis, the locking device comprises a plurality of first clamping grooves arranged in the circumferential direction on the push rod seat, the rear support is provided with a plurality of second clamping grooves in the circumferential direction, a locking gear capable of moving transversely in the space formed by the push rod seat and the rear support and capable of being clamped with the first clamping grooves and the second clamping grooves at the same time is arranged in the space, a movable block capable of rotating and pushing the locking gear away from the first clamping grooves when rotating is arranged between the locking gear and the push rod seat, a traction member capable of pulling the movable block to rotate when the upper push rod is folded relative to the lower push rod is arranged between the movable block and the upper push rod, and a reset spring capable of pushing the locking gear to move transversely and reset is further arranged between the locking gear and the rear support.

[0012] The upper end of the lower push rod is provided with an upper connecting seat, the lower end of the upper push rod is provided with a lower connecting seat rotatably connected with the upper connecting seat, the upper connecting seat is provided with a bayonet, the lower connecting seat is provided with a bayonet pin capable of being clamped with or separated from the bayonet, the upper push rod is provided with a switch, the switch and the bayonet pin are connected through a first pull rope, and a torsional spring capable of driving the upper push rod to rotate and fold relative to the lower push rod when the bayonet pin is separated from the bayonet is arranged between the upper connecting seat and the lower connecting seat.

[0013] The traction member comprises a second pull rope connected with the eccentric position of the movable block, the second pull rope is arranged in the lower push rod, the second pull rope is provided with a connecting block, the connecting block is provided with a horizontal shaft, and the lower connecting seat is provided with a driving groove for inserting the horizontal shaft and capable of pushing the horizontal shaft to pull the second pull rope when the upper push rod is folded relative to the lower push rod.

[0014] The first abutting surface on the handrail seat abuts against the third linkage rod when the child stroller framework is unfolded, and the lower end of the push rod assembly is provided with a second abutting surface abutting against the transmission rod when the child stroller framework is unfolded.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1、The child stroller framework of the present application is folded, and the push rod assembly rotates relative to the bottom support frame to close the rear support rod, and in this process, the linkage assembly drives the front support rod and the rear support rod to close and fold, realizing the folding of the bottom support frame, and more importantly, when the front support rod and the rear support rod are closed and folded, the linkage assembly drives the transmission rod to move, so that the handrail can also rotate and fold relative to the rear support rod, realizing the linkage folding of the handrail, and the whole folding operation is very simple and fast, and only the operation of rotating and folding the push rod assembly can realize the linkage of each part, and the folded volume is very small, which can be carried on the luggage rack of an airplane, facilitating carrying and storage.

[0017] 2、The seat frame of the present application includes a front side frame and a rear side frame, and when unfolded, the front side frame and the rear side frame are unfolded relative to each other to form a seat frame that can be sat on, and when folding is needed, the linkage assembly drives the front side frame and the rear side frame to rotate and fold through the front connecting rod, realizing the linkage folding of the seat frame, making the folding of the child stroller framework smooth, and the seat frame adopts a two-section design, which can reduce the thickness size of the child stroller framework after folding, making the child stroller framework convenient to store and carry.

[0018] 3、The present application has simple structure, smooth and flexible folding, can realize automatic folding, and is suitable for popularization and application.

DRAWINGS

[0019] Figure 1 is a perspective view of the present application;

[0020] Figure 2 is a side view of the present application;

[0021] Figure 3 is a sectional view of the present application;

[0022] Figure 4 is a side view of the present application in the folding process;

[0023] Figure 5 is a sectional view of the present application in the folding process;

[0024] Figure 6 is a perspective view of the present application in the folded state;

[0025] Figure 7 is a side view of the present application in the folded state;

[0026] Figure 8 is one of the exploded views of the components of the present application;

[0027] Figure 9 is a second exploded view of the component of the present application;

[0028] Figure 10 is a third exploded view of the component of the present application;

[0029] Figure 11 is a fourth exploded view of the component of the present application.

DETAILED DESCRIPTION

[0030] The present application will be further described below with reference to the drawings:

[0031] As Figures 1 to 7 shown in the drawings, a child stroller frame can be moved from an unfolded position to a folded position after the locking device is unlocked, and the unfolded position is used for children to travel, while the folded position can be conveniently carried or stored. In actual use, a flexible textile such as a cloth cover (not shown in the drawings) is connected to the child stroller frame to make the children travel comfortably. The child stroller frame includes a bottom support frame 1 for supporting on the ground, the bottom support frame 1 includes a rear support rod 11, the lower end of the rear support rod 11 is provided with a rear wheel 12, the upper end of the rear support rod 11 is provided with a rear support seat 13, the rear support seat 13 is rotatably connected with a front support rod 14 around a first axis A, the lower end of the front support rod 14 is connected with a front wheel 15, the bottom support frame 1 is rotatably connected with a pushing rod assembly 2 for pushing around a second axis B, the pushing rod assembly 2 and the bottom support frame 1 are provided with a linkage assembly 3 which can drive the front support rod 14 and the rear support rod 11 to rotate and close when the pushing rod assembly 2 rotates and folds relative to the rear support rod 11, the bottom support frame 1 is further rotatably connected with a handrail seat 41 around a third axis C, the handrail seat 41 is connected with a handrail 42, the handrail seat 41 and the linkage assembly 3 are provided with a transmission rod 5 which can drive the handrail seat 41 and the handrail 42 to rotate and fold relative to the rear support rod 11 when the front support rod 14 and the rear support rod 11 rotate and close. When the child stroller frame is folded, the pushing rod assembly 2 rotates relative to the bottom support frame 1 and closes to the rear support rod 11, in this process, the linkage assembly 3 drives the front support rod 14 and the rear support rod 11 to close and fold, realizing the folding of the bottom support frame 1, and when the front support rod 14 and the rear support rod 11 close and fold, the linkage assembly 3 also drives the transmission rod 5 to move, so that the transmission rod 5 drives the handrail 42 to also rotate and fold relative to the rear support rod 11, realizing the linkage folding of the handrail 42, the whole folding operation is very simple and fast, only the operation of rotating and folding the pushing rod assembly 2 can realize the linkage of each part, and the volume after folding is very small, which can be carried on the luggage rack of the airplane, convenient for carrying and storing. The locking device of the child stroller frame can adopt the locking structure in the traditional structure, of course, the specific locking device adopted in this embodiment will be described in detail later.

[0032] AsFigures 2 to 5 As shown, the push rod assembly 2 and the armrest base 41 are coaxially rotatably connected to the rear support 13, the upper end of the transmission rod 5 is rotatably connected to the armrest base 41 at a position deviated from the third axis C, and the lower end of the transmission rod 5 is rotatably connected to the linkage assembly 3. When the linkage assembly 3 pulls the front support rod 14 and the rear support rod 11 to approach each other, the linkage assembly 3 pulls the lower end of the transmission rod 5, and the transmission rod 5 pulls the armrest base 41 to rotate relative to the rear support 13 to fold. The folding is very smooth and flexible, and the push rod assembly 2 and the armrest base 41 are coaxially connected, and the whole structure is also very compact.

[0033] As shown, Figures 1 to 7 The child stroller framework further comprises a seat frame 6, the seat frame 6 comprises a front side frame 61 and a rear side frame 62 rotatably connected to the rear end of the front side frame 61 about the tenth axis J, the middle part of the rear side frame 62 is rotatably connected to the rear support 13 about the eleventh axis K, and the front side of the front side frame 61 is provided with a front connecting rod 63 between the linkage assembly 3, which can drive the front side frame 61 and the rear side frame 62 to rotate and fold when the front support rod 14 and the rear support rod 11 rotate and approach each other. The upper end of the front connecting rod 63 is rotatably connected to the front side frame 61 about the thirteenth axis M, and the lower end of the front connecting rod 63 is rotatably connected to the linkage assembly 3 about the twelfth axis L. When the child stroller framework is unfolded, the front side frame 61 and the rear side frame 62 are relatively unfolded to form a seat frame that can be sat on. When folding is needed, the linkage assembly 3 drives the front side frame 61 and the rear side frame 62 to rotate and fold through the front connecting rod 63, realizing linkage folding of the seat frame 6, so that the child stroller framework folds smoothly. Moreover, the seat frame 6 adopts a two-section design, which can reduce the thickness size of the child stroller framework after folding, so that the child stroller framework is convenient to store and carry.

[0034] As shown, Figures 1 to 5As shown, the linkage assembly 3 in this embodiment includes a first linkage rod 31, a second linkage rod 32, and a third linkage rod 33. The front end of the first linkage rod 31 is rotatably connected to the front support rod 14 around the fifth axis E. The rear end of the second linkage rod 32 is rotatably connected to the rear support rod 11 around the sixth axis F. The rear end of the first linkage rod 31 is rotatably connected to the front end of the second linkage rod 32 around the seventh axis G. The upper end of the third linkage rod 33 is rotatably connected to the push rod assembly 2 around the eighth axis H. The lower end of the third linkage rod 33 is rotatably connected to either the first linkage rod 31 or the second linkage rod 32 around the ninth axis I. The lower ends of the transmission rod 5 and the front connecting rod 63 are rotatably connected to the first linkage rod 31. When the stroller frame is folded, the push rod assembly 2 rotates relative to the rear support 13 and moves closer to the rear support rod 11. The push rod assembly 2 then presses down on the third linkage rod 33, which in turn pushes the first linkage rod 31 and the second linkage rod 32 downwards. This causes the first linkage rod 31 and the second linkage rod 32 to rotate relative to the front support rod 14 and the rear support rod 11, pulling the front support rod 14 and the rear support rod 11 closer together, thus achieving the linkage folding of the bottom support frame 1. In this embodiment, the lower end of the third linkage rod 33, the rear end of the first linkage rod 31, and the front end of the second linkage rod 32 are coaxially pivotally connected to ensure that the stroller frame structure is compact and folds flexibly. When the first linkage rod 31 rotates relative to the front support rod 14 and its rear end moves downwards, the first linkage rod 31 pulls the front connecting rod 63 and the transmission rod 5 downwards, thereby folding the seat frame 6 and rotating and folding the armrest 42 and the armrest seat 41.

[0035] like Figures 2 to 5 As shown, the transmission rod 5, the front connecting rod 63 and the first linkage rod 31 are coaxially pivotally connected around the twelfth axis L, and the push plate assembly 2, the armrest seat 41, the rear support 13 and the rear side frame 62 are coaxially pivotally connected, making the overall structure of the stroller frame compact and flexible to fold and close.

[0036] like Figures 1 to 5 As shown, the push rod assembly 2 includes a lower push rod 21 and an upper push rod 22 rotatably connected to the lower push rod 21. The lower end of the lower push rod 21 is provided with a push rod seat 23, and the push rod seat 23 is rotatably connected to the rear support 13 around the second axis B.

[0037] like Figure 1 , Figures 8 to 11As shown, the locking device comprises a plurality of first clamping slots 71 arranged on the push rod base 23 in the circumferential direction, a plurality of second clamping slots 72 arranged on the rear support 13 in the circumferential direction, a locking gear 73 arranged in the space surrounded by the push rod base 23 and the rear support 13 and capable of moving laterally and clamping the first clamping slots 71 and the second clamping slots 72 simultaneously, a movable block 74 arranged between the locking gear 73 and the push rod base 23 and capable of rotating and pushing the locking gear 73 to disengage from the first clamping slots 71 when rotating, a traction member 75 arranged between the movable block 74 and the upper push rod 22 and capable of pulling the movable block 74 to rotate when the upper push rod 22 rotates and folds relative to the lower push rod 21, a reset spring 76 arranged between the locking gear 73 and the rear support 13 and capable of pushing the locking gear 73 to move laterally and reset, an upper connecting base 24 arranged on the upper end of the lower push rod 21, a lower connecting base 25 rotatably connected with the upper connecting base 24 and arranged on the lower end of the upper push rod 22, a bayonet 77 arranged on the upper connecting base 24, a catch pin 78 arranged in the lower connecting base 25 and capable of clamping or disengaging with the bayonet 77, a switch 79 arranged on the upper push rod 22, the switch 79 connected with the catch pin 78 through a first pull rope 70, a torsion spring 8 arranged between the upper connecting base 24 and the lower connecting base 25 and capable of driving the upper push rod 22 to rotate and fold relative to the lower push rod 21 when the catch pin 78 disengages from the bayonet 77, the traction member 75 comprising a second pull rope 751 connected with the eccentric position of the movable block 74, the second pull rope 751 arranged in the lower push rod 21, a connecting block 752 arranged on the second pull rope 751, a horizontal shaft 753 arranged on the connecting block 752, and a driving slot 754 arranged on the lower connecting base 25 and capable of inserting the horizontal shaft 753 and pushing the horizontal shaft 753 to pull the second pull rope 751 when the upper push rod 22 rotates and folds relative to the lower push rod 21.

[0038] As Figure 1 , Figures 8 to 11As shown, when the child stroller frame needs to be folded, the switch 79 is operated, the catch 78 is pulled out of the opening 77 on the upper connecting seat 24 through the first pull rope 70, at this time the torsion spring 8 elastically returns to push the upper push rod 22 to rotate and fold relative to the lower push rod 21, in the process of rotating the upper push rod 22, the slot wall of the driving slot 754 on the upper connecting seat 25 pushes the horizontal shaft 753, so that the connecting block 752 moves upward relative to the lower connecting seat 24, then the movable block 74 is pulled to rotate through the second pull rope 751, in the process of rotating the movable block 74, the locking gear 73 is pushed transversely to disengage from the first clamping slot 71, at this time the locking device is unlocked, under the action of gravity of the push rod assembly 2, the push rod assembly 2 automatically rotates downward to close to the rear support rod 11, and the front support rod 14 and the rear support rod 11 are closed through the linkage assembly 3, and the folding of the armrest 42 and the seat frame 6 is realized through the transmission rod 5 and the front connecting rod 63. In the whole folding operation, only the switch 79 needs to be operated, the torsion spring 8 automatically drives the upper push rod 22 to rotate and fold relative to the lower push rod 21, and the push rod assembly 2 automatically rotates to fold the rear support rod 11, that is, only the switch 79 needs to be operated to realize the automatic folding of the child stroller frame, the folding operation is very convenient and fast, and is suitable for single-handed operation.

[0039] As shown in Figure 3 In order to make the child stroller frame more stable in the unfolded position, the armrest seat 41 is provided with a first abutting surface 43 abutting against the third linkage rod 33 when the child stroller frame is unfolded, and the lower end of the push rod assembly 2 is provided with a second abutting surface 26 abutting against the transmission rod 5 when the child stroller frame is unfolded, specifically, the second abutting surface 26 is arranged on the push rod seat 23. The first abutting surface 43 abuts against the third linkage rod 33, and the second abutting surface 26 abuts against the transmission rod 5, so as to limit the corresponding parts and ensure that the child stroller frame is unfolded firmly.

[0040] As shown in Figure 6 and Figure 7 When the child stroller frame is in the folded position, it has a small volume and can be placed in the aircraft luggage rack, which is very convenient for carrying or storing. In addition, the armrest 42 and the armrest seat 41 are directly connected to the rear support 13, which is convenient for children to hold when riding and realizes linkage folding to be folded to a suitable position when folded. Moreover, the seat frame 6 is designed in two sections, which can provide enough riding area for children when unfolded, and realizes linkage folding to be folded to a suitable position when folded, ensuring that the overall folded child stroller frame has a small volume. Of course, in order to ensure the comfort of children, the backrest 9 can be rotatably connected to the rear side frame 62 to support the back of the child, and the positioning of the backrest 9 is achieved by the flexible textile on the child stroller frame. When the child stroller is folded, the backrest 9 is rotated backward to close to other parts.

[0041] The above embodiment is described in detail in combination with the drawings, but the present application is not limited to the above embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application.

Claims

1. A stroller frame that can move from an unfolded position to a folded position after the locking device is unlocked, characterized in that: The system includes a bottom support frame (1), which includes a rear support rod (11). The lower end of the rear support rod (11) is provided with a rear wheel (12), and the upper end of the rear support rod (11) is provided with a rear support seat (13). A front support rod (14) is rotatably connected to the rear support seat (13) around a first axis (A). A front wheel (15) is connected to the lower end of the front support rod (14). A push rod assembly (2) is rotatably connected to the bottom support frame (1) around a second axis (B). A space is also provided between the push rod assembly (2) and the bottom support frame (1). When the push rod assembly (2) rotates and folds relative to the rear support rod (11), it can drive the front support rod (14) and the rear support rod (11) to rotate and move closer together. The bottom support frame (1) is also rotatably connected to the armrest seat (41) around the third axis (C). The armrest seat (41) is connected to the armrest (42). The armrest seat (41) and the linkage assembly (3) are provided with a transmission rod (5) that can drive the armrest seat (41) and the armrest (42) to rotate and fold relative to the rear support rod (11) when the front support rod (14) and the rear support rod (11) rotate and move closer together.

2. The stroller frame according to claim 1, characterized in that: The upper end of the transmission rod (5) is rotatably connected to the armrest seat (41) around the fourth axis (D) and offset from the third axis (C). The lower end of the transmission rod (5) is rotatably connected to the linkage assembly (3).

3. The stroller frame according to claim 2, characterized in that: It also includes a seat frame (6), which includes a front frame (61) and a rear frame (62) rotatably connected to the rear end of the front frame (61) around the tenth axis (J). The middle part of the rear frame (62) is rotatably connected to the rear support (13) around the eleventh axis (K). The front side of the front frame (61) is provided with a front connecting rod (63) between the front side and the linkage assembly (3), which can drive the front frame (61) and the rear frame (62) to rotate and fold when the front support rod (14) and the rear support rod (11) rotate and approach each other. The upper end of the front connecting rod (63) is rotatably connected to the front frame (61) around the thirteenth axis (M), and the lower end of the front connecting rod (63) is rotatably connected to the linkage assembly (3) around the twelfth axis (L).

4. The stroller frame according to claim 3, characterized in that: The linkage assembly (3) includes a first linkage rod (31), a second linkage rod (32), and a third linkage rod (33). The front end of the first linkage rod (31) is rotatably connected to the front support rod (14) around the fifth axis (E). The rear end of the second linkage rod (32) is rotatably connected to the rear support rod (11) around the sixth axis (F). The rear end of the first linkage rod (31) is rotatably connected to the front end of the second linkage rod (32) around the seventh axis (G). The upper end of the third linkage rod (33) is rotatably connected to the push rod assembly (2) around the eighth axis (H). The lower end of the third linkage rod (33) is rotatably connected to the first linkage rod (31) or the second linkage rod (32) around the ninth axis (I). The lower ends of the transmission rod (5) and the front connecting rod (63) are rotatably connected to the first linkage rod (31).

5. The stroller frame according to any one of claims 1 to 4, characterized in that: The push rod assembly (2) and the armrest seat (41) are rotatably connected coaxially to the rear support (13).

6. The stroller frame according to claim 4, characterized in that: The transmission rod (5), the front connecting rod (63) and the first linkage rod (31) are coaxially pivoted around the twelfth axis (L), and the push plate assembly (2), the armrest seat (41), the rear support (13) and the rear side frame (62) are coaxially pivoted.

7. The stroller frame according to any one of claims 1 to 4, characterized in that: The push rod assembly (2) includes a lower push rod (21) and an upper push rod (22) rotatably connected to the lower push rod (21). The lower push rod (21) has a push rod seat (23) at its lower end. The push rod seat (23) is rotatably connected to the rear support (13) around a second axis (B). The locking device includes a plurality of first slots (71) arranged along the circumferential direction on the push rod seat (23). The rear support (13) has a plurality of second slots (72) arranged along the circumferential direction. The space enclosed by the push rod seat (23) and the rear support (13) is provided with a space that can move laterally within it and engage with the first slots (71). 1) A locking gear (73) that engages with the second slot (72) simultaneously. A movable block (74) is provided between the locking gear (73) and the push rod seat (23) and can rotate and push the locking gear (73) to disengage from the first slot (71) when rotating. A traction member (75) is provided between the movable block (74) and the upper push rod (22) and can pull the movable block (74) to rotate when the upper push rod (22) rotates and folds relative to the lower push rod (21). A return spring (76) is also provided between the locking gear (73) and the rear support (13) and can push the locking gear (73) to move laterally and reset.

8. The stroller frame according to claim 7, characterized in that: The upper end of the lower push rod (21) is provided with an upper connecting seat (24), and the lower end of the upper push rod (22) is provided with a lower connecting seat (25) that is rotatably connected to the upper connecting seat (24). The upper connecting seat (24) is provided with a bayonet (77), and the lower connecting seat (25) is provided with a locking pin (78) that can engage or disengage with the bayonet (77). The upper push rod (22) is provided with a switch (79), and the switch (79) and the locking pin (78) are connected by a first pull rope (70). A torsion spring (8) is provided between the upper connecting seat (24) and the lower connecting seat (25) that can drive the upper push rod (22) to rotate and fold relative to the lower push rod (21) when the locking pin (78) disengages from the bayonet (77).

9. The stroller frame according to claim 8, characterized in that: The traction component (75) includes a second pull rope (751) connected to the eccentric position of the movable block (74). The second pull rope (751) is inserted into the lower push rod (21). The second pull rope (751) is provided with a connecting block (752). The connecting block (752) is provided with a horizontal shaft (753). The lower connecting seat (25) is provided with a drive groove (754) for inserting the horizontal shaft (753) and for pushing the horizontal shaft (753) to pull the second pull rope (751) by the groove wall when the upper push rod (22) rotates and folds relative to the lower push rod (21).

10. The stroller frame according to claim 4, characterized in that: The armrest seat (41) is provided with a first abutting surface (43) that abuts against the third linkage rod (33) when the stroller frame is unfolded, and the lower end of the push rod assembly (2) is provided with a second abutting surface (26) that abuts against the transmission rod (5) when the stroller frame is unfolded.

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