Stroller framework

Abstract

A bottom supporting frame comprises a front leg and a rear leg which is rotatably connected with the front leg around a first axis, the upper end of the bottom supporting frame is rotatably connected with a push rod assembly around a second axis, and a linkage assembly is movably connected between the front leg and the rear leg. A transmission part which can be movably connected with the push rod assembly and the linkage assembly and can drive the linkage assembly to move when the push rod assembly gets close to the rear legs is arranged between the push rod assembly and the linkage assembly. The stroller framework further comprises a seat assembly which can rotate and be folded relative to the push rod assembly and the linkage assembly when the front legs rotate and get close to the rear legs. The seat assembly comprises a front seat supporting piece and a rear seat supporting piece rotationally connected with the front seat supporting piece, a front connecting rod movably connected with the front seat supporting piece and the front legs is arranged between the front seat supporting piece and the front legs, and the rear seat supporting piece is rotationally connected with the upper ends of the rear legs. The front seat support is flush with the rear seat support. The folding chair is simple in structure and convenient to fold.

Description

TECHNICAL FIELD

[0001] The utility model relates to a child stroller framework. BACKGROUND

[0002] The child stroller is a common product in the growth process of children, which can be unfolded or folded generally, and is used for children to travel in the unfolded state, and is convenient to carry or store in the folded state.

[0003] The structure of the child stroller framework is related to the convenience of folding operation of the child stroller and the compactness of the folded child stroller. The connecting rod structures of the child stroller frameworks on the market are various, and the folding action principles are different. The utility model provides a novel child stroller framework different from the existing child stroller framework. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of the prior art, and provides a child stroller framework which is simple in structure, convenient to fold, and small in size after folding.

[0005] The utility model is realized through the following technical schemes:

[0006] A child stroller framework can be moved from an unfolded position to a folded position after a locking device is unlocked, comprising a foldable bottom support frame, wherein the bottom support frame comprises a front leg and a rear leg rotatably connected with the front leg around a first axis, the lower ends of the front leg and the rear leg are provided with wheels, the upper end of the bottom support frame is rotatably connected with a push rod assembly around a second axis, the front leg and the rear leg are movably connected with a linkage assembly capable of driving the front leg and the rear leg to move closer to each other, a transmission member capable of movably connecting the push rod assembly and the linkage assembly and driving the linkage assembly to move when the push rod assembly moves closer to the rear leg is arranged between the push rod assembly and the linkage assembly, the child stroller framework further comprises a seat assembly capable of being folded relative to the front leg and the rear leg when the front leg rotates and moves closer to the rear leg, the seat assembly comprises a front seat support and a rear seat support rotatably connected with the front seat support around a seventh axis, a front connecting rod movably connecting the front seat support and the front leg is arranged between the front seat support and the front leg, the rear seat support is rotatably connected with the upper end of the rear leg around an eighth axis, and in the unfolded state of the child stroller framework, the front seat support is flush with the rear seat support.

[0007] In the folded state of the child stroller framework, the front seat support and the rear seat support move to a position substantially perpendicular to each other, and the front seat support moves to a position substantially extending along the front leg.

[0008] The front end of the linkage assembly is rotatably connected with the front leg about a third axis, the rear end of the linkage assembly is rotatably connected with the rear leg about a fourth axis, the transmission member comprises a transmission rod, the upper end of the transmission rod is rotatably connected with the push rod assembly about a fifth axis, and the lower end of the transmission rod is rotatably connected with the middle part of the linkage assembly about a sixth axis.

[0009] The linkage assembly comprises a first connecting rod and a second connecting rod, the front end of the first connecting rod is rotatably connected with the front leg about the third axis, the rear end of the second connecting rod is rotatably connected with the rear leg about the fourth axis, and the rear end of the first connecting rod and the front end of the second connecting rod are rotatably connected with the lower end of the transmission rod.

[0010] The first connecting rod, the second connecting rod and the transmission rod are rotatably connected about the sixth axis.

[0011] The first connecting rod is formed by bending a metal sheet, and a strip-shaped stamping groove intersecting with a bending mark is stamped at the bending position of the metal sheet.

[0012] The upper end of the front connecting rod is rotatably connected with the front seat support member about a ninth axis, and the lower end of the front connecting rod is rotatably connected with the front leg about a tenth axis.

[0013] The push rod assembly comprises a lower push rod and a U-shaped upper push rod rotatably connected with the lower push rod, the upper end of the front leg is provided with a front leg seat, the upper end of the rear leg is provided with a rear leg seat, the lower end of the lower push rod is provided with a push rod seat, the front leg seat, the rear leg seat and the push rod seat are coaxially pivoted to rotatably connect the front leg, the rear leg and the push rod assembly, the push rod seat is arranged between the front leg seat and the rear leg seat, the locking device comprises a first tooth groove arranged on the front leg seat in the circumferential direction, the rear leg seat is provided with a second tooth groove in the circumferential direction, one side of the push rod seat is provided with a third tooth groove opposite to the first tooth groove in the circumferential direction, the other side of the push rod seat is provided with a fourth tooth groove opposite to the second tooth groove in the circumferential direction, the second tooth groove and the fourth tooth groove are simultaneously clamped by a second clamping piece capable of moving transversely between the push rod seat and the rear leg seat, the first tooth groove and the third tooth groove are simultaneously clamped by a first clamping piece capable of moving transversely between the push rod seat and the front leg seat, the push rod seat and the first clamping piece are provided with a movable block capable of pushing the second clamping piece away from the fourth tooth groove and pushing the first clamping piece away from the third tooth groove when the movable block is active, the push rod assembly is further provided with a driving piece capable of driving the movable block to be active, the second clamping piece and the rear leg seat are provided with a second reset spring capable of pushing the second clamping piece to move and reset, the first clamping piece and the front leg seat are provided with a first reset spring capable of pushing the first clamping piece to move and reset, the driving piece comprises a sliding rod arranged between the lower push rod and the upper push rod and capable of being driven by the upper push rod to slide relative to the lower push rod when the upper push rod is folded relative to the lower push rod, the movable block is pivoted with a driving rod, the sliding rod and the driving rod are provided with a pull rope capable of pulling the driving rod to rotate the movable block, the lower push rod is further provided with a fourth reset spring capable of pushing the driving rod to move and reset.

[0014] The lower end of the upper push rod is provided with a first connecting seat, the upper end of the lower push rod is provided with a second connecting seat, the first connecting seat and the second connecting seat are rotatably connected, the upper end of the sliding rod is provided with a horizontal shaft, the first connecting seat is provided with an arc-shaped groove for the horizontal shaft to pass through, the arc-shaped groove comprises a displacement segment and a driving segment connected with the displacement segment, from the starting end of the displacement segment to the terminal end thereof, the distance between the displacement segment and the rotating shaft of the upper push rod and the lower push rod is constant, from the starting end of the driving segment to the terminal end thereof, the distance between the driving segment and the rotating shaft of the upper push rod and the lower push rod gradually decreases, and the terminal end of the displacement segment is connected with the starting end of the driving segment.

[0015] The second connecting seat is provided with a clamping groove along the radial direction thereof, the first connecting seat is provided with a clamping shaft capable of sliding in the first connecting seat and clamping or disengaging with the clamping groove, the second connecting seat is further provided with an arc-shaped clearance groove communicated with the clamping groove and capable of allowing the clamping shaft to move in, the clamping shaft is connected with a sliding block, the up pushing rod is provided with a pull cable capable of pulling the sliding block to slide, the up pushing rod is provided with a switch connected with the pull cable, and the up pushing rod is further provided with a third reset spring capable of pushing the sliding block to move and reset.

[0016] Compared with the prior art, the utility model have following advantages: when folding, the push rod assembly rotates to close relative to the rear legs, in this process, the push rod assembly drives the transmission member to move, so that the linkage assembly can pull the front legs to rotate to close relative to the rear legs, and when the front legs rotate to close relative to the rear legs, the front seat support member rotates relative to the rear seat support member through the front connecting rod, and the rear seat support member rotates relative to the upper end of the rear legs, so that the front seat support member and the rear seat support member also close to the bottom support frame to realize folding. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the utility model perspective view;

[0018] Figure 2 It is the utility model unfolded state side view;

[0019] Figure 3 It is the utility model after removing seat component perspective view;

[0020] Figure 4 It is the utility model folding process side view one;

[0021] Figure 5 It is the utility model folding process sectional view;

[0022] Figure 6 It is the utility model folding state side view;

[0023] Figure 7 It is the utility model one of component exploded view;

[0024] Figure 8 It is the utility model two of component exploded view;

[0025] Figure 9 is one of the perspective views of the components of the present application;

[0026] Figure 10 is the second perspective view of the components of the present application;

[0027] Figure 11 is the third perspective view of the components of the present application;

[0028] Figure 12 is the third exploded view of the components of the present application;

[0029] Figure 13 is the fourth perspective view of the components of the present application;

[0030] Figure 14 is the side view of the components of the present application.

CONCRETE EMBODIMENT

[0031] The present application will be further described in conjunction with the accompanying drawings:

[0032] As Figures 1 to 6As shown, a child stroller framework capable of moving from an unfolded position to a folded position after the locking device is unlocked, comprising a foldable bottom support frame 1, the bottom support frame 1 comprising a front leg 11 and a rear leg 12 rotatably connected with the front leg 11 around a first axis A, the front leg 11 and the rear leg 12 are both provided with a wheel 13 at the lower end, the upper end of the bottom support frame 1 is rotatably connected with a push rod assembly 2 around a second axis B, the front leg 11 and the rear leg 12 are movably connected with a linkage assembly 3 capable of bringing the two closer to each other, the push rod assembly 2 and the linkage assembly 3 are provided with a transmission member 4 movably connected with the two and capable of driving the linkage assembly 3 to move when the push rod assembly 2 is closer to the rear leg 12. After the locking device is unlocked, the push rod assembly 2 can be rotated backward relative to the rear leg 12 to be closer to the rear leg 12, and in the process of rotation, the push rod assembly 2 drives the linkage assembly 3 to move through the transmission member 4, and the linkage assembly 3 drives the front leg 11 to rotate and be closer to the rear leg 12, so that the push rod assembly 2 and the front leg 11 are both closer to the rear leg 12, and in the process of rotating and folding the push rod assembly 2, the front leg 11 can be directly driven to rotate and fold, so that the child stroller framework is flexible and convenient to fold. The child stroller framework can be hung with a flexible seat pocket on the push rod assembly 2, and the child can sit in the seat pocket. Of course, in order to make the child more comfortable, the child stroller framework also comprises a seat assembly capable of rotating and folding relative to the front leg 11 and the rear leg 12 when the front leg 11 is rotated and folded to the rear leg 12, the seat assembly comprising a front seat support 51 and a rear seat support 52 rotatably connected with the front seat support 51 around a seventh axis G, the front seat support 51 and the rear leg 11 are provided with a front connecting rod 53 movably connected with the two, the rear seat support 52 is rotatably connected with the upper end of the rear leg 12 around an eighth axis H, and in the unfolded state of the child stroller framework, the front seat support 51 and the rear seat support 52 are flush. The front seat support 51 and the rear seat support 52 are flush with each other to provide a seat for the child, which can ensure that the seat assembly of the child stroller has enough length in the front and rear directions, and the child can sit comfortably, and when the child stroller framework is folded, the front seat support 51 and the rear seat support 52 can be folded relative to each other, thereby ensuring that the child stroller framework is compact after folding. Therefore, the whole child stroller framework has simple structure, convenient folding operation, small volume after folding, convenient carrying, and is suitable for popularization and application.

[0033] As Figure 6As shown, when the stroller frame is folded, the front seat support 51 and the rear seat support 52 are moved to a substantially perpendicular position, i.e. the angle between the front seat support 51 and the rear seat support 52 is within the range of 80 degrees to 110 degrees, and the front seat support 51 is moved to a position substantially along the front leg 11, i.e. the angle between the front leg 11 and the front seat support 51 is within the range of 0 degree to 10 degrees. In this position, the stroller frame can be ensured to be in a compact state after folding, so as to occupy a small space in the folded state and facilitate carrying or storage. In this embodiment, the front seat support 51 and the rear seat support 52 adopt a plate structure to ensure the comfort of the child.

[0034] As shown, Figures 1 to 6 As shown, the front end of the linkage assembly 3 is rotatably connected to the front leg 11 about a third axis C, the rear end of the linkage assembly 3 is rotatably connected to the rear leg 12 about a fourth axis D, the transmission member 4 comprises a transmission rod 41, the upper end of the transmission rod 41 is rotatably connected to the push rod assembly 2 about a fifth axis E, and the lower end of the transmission rod 41 is rotatably connected to the middle part of the linkage assembly 3 about a sixth axis F. When the push rod assembly 2 is rotated to approach the rear leg 12, the push rod assembly 2 pushes the transmission rod 41 upwards, and the lower end of the transmission rod 41 pushes the linkage assembly 3, so as to make the linkage assembly 3 pull the front leg 11 and the rear leg 12 to approach each other. Specifically, the linkage assembly 3 comprises a first connecting rod 31 and a second connecting rod 32, the front end of the first connecting rod 31 is rotatably connected to the front leg 11 about the third axis C, the rear end of the second connecting rod 32 is rotatably connected to the rear leg 12 about the fourth axis D, and the rear end of the first connecting rod 31 and the front end of the second connecting rod 32 are rotatably connected to the lower end of the transmission rod 41. When the transmission rod 41 is pushed downwards, the first connecting rod 31 rotates relative to the front leg 11, and the second connecting rod 32 rotates relative to the rear leg 12, so as to pull the front leg 11 and the rear leg 12 to approach each other. In order to make the stroller frame fold flexibly, in this embodiment, the first connecting rod 31, the second connecting rod 32 and the transmission rod 41 are rotatably connected about the sixth axis F.

[0035] As shown, Figure 1 As shown, the upper end of the transmission rod 41 is detachably connected to the front handrail 14, so as to be gripped by the child and ensure safety during riding.

[0036] As shown, Figure 3 and Figure 4 As shown, the first connecting rod 31 is formed by bending a metal sheet, and a strip-shaped stamping groove 33 intersecting with a bending line 31a is stamped at the bending position of the metal sheet. The strip-shaped stamping groove 33 intersecting with the bending line 31a stamped at the bending position of the metal sheet can greatly improve the structural strength of the first connecting rod 31, and avoid deformation during long-time folding or unfolding, thereby causing inconvenience in use.

[0037] AsFigure 4 and Figure 5 As shown in Fig. 1, the upper end of the front link 53 is rotatably connected to the front seat support 51 about a ninth axis I, and the lower end of the front link 53 is rotatably connected to the front leg 11 about a tenth axis J. When the front leg 11 is rotated towards the rear leg 12, the front link 51 is rotated relative to the front seat support 51 and the front leg 11, thereby pulling the front seat support 51 towards the front leg 11, and further folding the seat assembly.

[0038] As shown in Fig. 1, the upper end of the front link 53 is rotatably connected to the front seat support 51 about a ninth axis I, and the lower end of the front link 53 is rotatably connected to the front leg 11 about a tenth axis J. When the front leg 11 is rotated towards the rear leg 12, the front link 51 is rotated relative to the front seat support 51 and the front leg 11, thereby pulling the front seat support 51 towards the front leg 11, and further folding the seat assembly. Figures 7 to 11As shown, the push rod assembly 2 comprises a lower push rod 21 and a U-shaped upper push rod 22 rotatably connected with the lower push rod 21, the front leg 11 is provided with a front leg seat 111 at the upper end, the rear leg 12 is provided with a rear leg seat 121 at the upper end, the lower push rod 21 is provided with a push rod seat 211 at the lower end, the front leg seat 111, the rear leg seat 121 and the push rod seat 211 are coaxially pivoted to rotatably connect the front leg 11, the rear leg 12 and the push rod assembly 2, the push rod seat 211 is arranged between the front leg seat 111 and the rear leg seat 121, the locking device comprises a first tooth groove 61 arranged on the front leg seat 111 in the circumferential direction, the rear leg seat 121 is provided with a second tooth groove 62 in the circumferential direction, one side of the push rod seat 211 is provided with a third tooth groove 63 opposite to the first tooth groove 61 in the circumferential direction, the other side of the push rod seat 211 is provided with a fourth tooth groove 64 opposite to the second tooth groove 62 in the circumferential direction, the second tooth groove 62 and the fourth tooth groove 64 are simultaneously engaged by a second engaging piece 65 arranged between the push rod seat 211 and the rear leg seat 121 and capable of moving transversely therebetween, the first tooth groove 61 and the third tooth groove 63 are simultaneously engaged by a first engaging piece 66 arranged between the push rod seat 211 and the front leg seat 111 and capable of moving transversely therebetween, the second engaging piece 65 and the fourth tooth groove 64 are disengaged by an active block 67 arranged between the push rod seat 211 and the first engaging piece 66 and capable of pushing the second engaging piece 65 and the fourth tooth groove 64 to disengage when the active block 67 is active, the active block 67 is driven to be active by a driving piece 68 arranged in the push rod assembly 2, the second engaging piece 65 and the rear leg seat 121 are provided with a second reset spring 69 capable of pushing the second engaging piece 65 to move and reset, the first engaging piece 66 and the front leg seat 111 are provided with a first reset spring 60 capable of pushing the first engaging piece 66 to move and reset, the driving piece 68 comprises a sliding rod 681 arranged between the lower push rod 21 and the upper push rod 22 and capable of being driven by the upper push rod 22 to slide relative to the lower push rod 21 when the upper push rod 22 is folded relative to the lower push rod 21, the active block 67 is pivoted with a driving rod 682, the sliding rod 681 and the driving rod 682 are provided with a pull rope 683 capable of pulling the driving rod 682 to rotate the active block 67, the lower push rod 21 is further provided with a fourth reset spring 684 capable of pushing the driving rod 682 to move and reset, one side of the active block 67 is provided with a plurality of first protrusions 671 with first inclined surfaces 67a in the circumferential direction, the second engaging piece 65 is provided with a first inclined wall 65a capable of cooperating with the first inclined surfaces 67a and being pushed by the first inclined surfaces 67a when the active block 67 is rotated, the other side of the active block 67 is provided with a plurality of second protrusions 672 with second inclined surfaces 67b in the circumferential direction, the first engaging piece 66 is provided with a second inclined wall 66a capable of cooperating with the second inclined surfaces 67b and being pushed by the second inclined surfaces 67b when the active block 67 is rotated.

[0039] AsFigures 12 to 14 As shown in the figure, the upper end of the upper push rod 22 is provided with a first connecting seat 221, the upper end of the lower push rod 21 is provided with a second connecting seat 212, the first connecting seat 221 is rotatably connected with the second connecting seat 212, the upper end of the sliding rod 681 is provided with a horizontal shaft 685, the first connecting seat 221 is provided with an arc-shaped slot 71 for the horizontal shaft 685 to pass through, the arc-shaped slot 71 comprises a clearance section 711 and a driving section 712 connected with the clearance section 711, the distance between the clearance section 711 and the rotating axis of the upper push rod 22 and the lower push rod 21 is constant from the starting end to the terminal end of the clearance section 711, the distance between the driving section 712 and the rotating axis of the upper push rod 22 and the lower push rod 21 gradually decreases from the starting end to the terminal end of the driving section 712, and the terminal end of the clearance section 711 is connected with the starting end of the driving section 712.

[0040] As shown in the figure, Figures 12 to 14 the second connecting seat 212 is provided with a clamping slot 81 along the radial direction, the first connecting seat 221 is provided with a clamping shaft 82 which can slide in the first connecting seat 221 and can be clamped or disengaged with the clamping slot 81, the second connecting seat 212 is further provided with an arc-shaped clearance slot 83 which is connected with the clamping slot 81 and can move in the second connecting seat 212, the clamping shaft 82 is connected with a sliding block 84, the upper push rod 22 is provided with a pulling rope 85 which can pull the sliding block 84 to slide, the upper push rod 22 is provided with a switch 86 connected with the pulling rope 85, and the upper push rod 22 is further provided with a third reset spring 87 which can push the sliding block 84 to move and reset.

[0041] As shown in the figure, Figure 12 the arc-shaped clearance slot 83 is provided with a clamping slot 81 at both ends, in the unfolded state or the folded state of the child stroller frame, the clamping shaft 82 is clamped in different clamping slots 81, so that the state of the child stroller frame is maintained. The first connecting seat 221 and the second connecting seat 212 are provided with a torsion spring 9, when the child stroller frame is folded, the torsion spring 9 is in a deformed state, when the child stroller frame needs to be unfolded, only the clamping shaft 82 needs to be withdrawn from the clamping slot 81, the torsion spring 9 can push the upper push rod 22 to rotate and reset, so that the unfolded state of the child stroller frame is convenient and fast.

[0042] As shown in the figure, Figures 7 to 14The working principle of the unlocking of the locking device is described in detail as follows: first, the switch 86 is operated, the sliding block 84 is moved in the first connecting seat 221 by the pull rope 85, the clamping shaft 82 on the sliding block 84 is disengaged from the clamping groove 81 on the second connecting seat 212, and the upper push rod 22 can be moved towards the lower push rod 21. In the initial angular range of the rotation of the upper push rod 22 relative to the lower push rod 21, the horizontal shaft 685 moves in the displacement section 711, and since the distance between the displacement section 711 and the rotation center of the upper push rod 22 and the lower push rod 21 is constant, the horizontal shaft 685 is not pushed upward in the displacement section 711, and the sliding rod 681 is not moved at this time. When the upper push rod 22 continues to rotate and the horizontal shaft 685 enters the driving section 712, since the distance between the driving section 712 and the rotation center of the upper push rod 22 and the lower push rod 21 gradually decreases, the groove wall of the driving section 712 pushes the horizontal shaft 685 upward, the sliding rod 681 is slid upward, the sliding rod 681 pulls the driving rod 682 through the pull rope 683, the driving rod 682 pulls the movable block 67 to rotate, and the first inclined surface 67a on the movable block 67 pushes the first inclined wall 65a on the second clamping piece 65 during the rotation, so that the second clamping piece 65 exits the fourth tooth groove 64 on the push rod seat 211. At the same time, the second inclined surface 67b on the movable block 67 pushes the second inclined wall 66a on the first clamping piece 66, so that the first clamping piece 66 exits the third tooth groove 63 on the push rod seat 211. At this time, the push rod seat 211 is unlocked from the front leg seat 111 and the rear leg seat 121, and the lower push rod 21 can be rotated relative to the bottom support frame 1 to move towards the rear leg 12, thereby realizing the folding of the child stroller frame. The entire folding operation only needs to operate the switch 86 and then rotate the upper push rod 22 forward, and the locking device is unlocked during the rotation of the upper push rod 22, and after the locking device is unlocked, the push rod assembly 2 is rotated relative to the rear leg 12 under the action of its own gravity, thereby realizing the folding of the entire vehicle. Therefore, the child stroller frame can be automatically folded by pressing the switch 86 and rotating the upper push rod 22 forward, and after being folded, it can be automatically stood on the ground (as shown in Figure 6 The folding operation is very convenient and fast.

[0043] The above embodiment is described in detail in combination with the drawings, but the utility model is not limited to the above embodiment, and various changes can be made within the knowledge range possessed by ordinary skilled persons in the technical field without departing from the purpose.

Claims

1. A child's pushchair frame which is movable from an unfolded position to a folded position after unlocking of a locking device, characterised in that: The child stroller framework comprises a foldable bottom support frame (1), the bottom support frame (1) comprises a front leg (11) and a rear leg (12) rotatably connected with the front leg (11) around a first axis (A), the lower end of the front leg (11) and the rear leg (12) is provided with a wheel (13), the upper end of the bottom support frame (1) is rotatably connected with a push rod assembly (2) around a second axis (B), the front leg (11) and the rear leg (12) are movably connected with a linkage assembly (3) capable of driving the two to approach each other, the push rod assembly (2) and the linkage assembly (3) are provided with a transmission member (4) movably connected with the two and capable of driving the linkage assembly (3) to move when the push rod assembly (2) approaches the rear leg (12), the child stroller framework further comprises a seat assembly capable of being folded relative to the two when the front leg (11) rotates and approaches the rear leg (12), the seat assembly comprises a front seat support (51) and a rear seat support (52) rotatably connected with the front seat support (51) around a seventh axis (G), the front seat support (51) and the front leg (11) are movably connected with a front connecting rod (53), the rear seat support (52) is rotatably connected with the upper end of the rear leg (12) around an eighth axis (H), in the unfolded state of the child stroller framework, the front seat support (51) and the rear seat support (52) are flush.

2. The child's carriage frame of claim 1, wherein: In the folded state of the child stroller framework, the front seat support (51) and the rear seat support (52) move to a position substantially perpendicular to each other, and the front seat support (51) moves to a position substantially extending along the front leg (11).

3. The child's carriage frame of claim 1 wherein: The front end of the linkage assembly (3) is rotatably connected with the front leg (11) around a third axis (C), the rear end of the linkage assembly (3) is rotatably connected with the rear leg (12) around a fourth axis (D), and the transmission member (4) comprises a transmission rod (41), the upper end of the transmission rod (41) is rotatably connected with the push rod assembly (2) around a fifth axis (E), and the lower end of the transmission rod (41) is rotatably connected with the middle part of the linkage assembly (3) around a sixth axis (F).

4. The child's carriage frame of claim 3, wherein: The linkage assembly (3) comprises a first connecting rod (31) and a second connecting rod (32), the front end of the first connecting rod (31) is rotatably connected with the front leg (11) around the third axis (C), the rear end of the second connecting rod (32) is rotatably connected with the rear leg (12) around the fourth axis (D), and the rear end of the first connecting rod (31) and the front end of the second connecting rod (32) are rotatably connected with the lower end of the transmission rod (41).

5. The stroller frame of claim 4, wherein: The first connecting rod (31), the second connecting rod (32) and the transmission rod (41) are rotatably connected around the sixth axis (F).

6. The stroller frame of claim 4, wherein: The first connecting rod (31) is formed by bending a metal sheet, and a strip-shaped stamping groove (33) intersecting with a bending mark (31a) is stamped at the bending position of the metal sheet.

7. The child's carriage frame of claim 1 wherein: The upper end of the front connecting rod (53) is rotatably connected with the front seat support (51) around the ninth axis (I), and the lower end of the front connecting rod (53) is rotatably connected with the front leg (11) around the tenth axis (J).

8. The child's carriage frame of claim 1 wherein: The front leg seat (111), the rear leg seat (121) and the push rod seat (211) are coaxially pivoted to rotatably connect the front leg (11), the rear leg (12) and the push rod assembly (2) with each other, the push rod seat (211) is arranged between the front leg seat (111) and the rear leg seat (121), the locking device comprises a first tooth groove (61) arranged on the front leg seat (111) in the circumferential direction, the rear leg seat (121) is provided with a second tooth groove (62) in the circumferential direction, one side of the push rod seat (211) is provided with a third tooth groove (63) opposite to the first tooth groove (61) in the circumferential direction, the other side of the push rod seat (211) is provided with a fourth tooth groove (64) opposite to the second tooth groove (62) in the circumferential direction, a second clamping piece (65) capable of moving transversely between the push rod seat (211) and the rear leg seat (121) and capable of being clamped with the second tooth groove (62) and the fourth tooth groove (64) at the same time is arranged between the push rod seat (211) and the rear leg seat (121), a first clamping piece (66) capable of moving transversely between the push rod seat (211) and the front leg seat (111) and capable of being clamped with the first tooth groove (61) and the third tooth groove (63) at the same time is arranged between the push rod seat (211) and the front leg seat (111), an activity block (67) capable of pushing the second clamping piece (65) to disengage from the fourth tooth groove (64) and pushing the first clamping piece (66) to disengage from the third tooth groove (63) when moving is arranged between the push rod seat (211) and the first clamping piece (66), a driving piece (68) capable of driving the activity block (67) to move is further arranged in the push rod assembly (2), a second reset spring (69) capable of pushing the second clamping piece (65) to move and reset is arranged between the second clamping piece (65) and the rear leg seat (121), a first reset spring (60) capable of pushing the first clamping piece (66) to move and reset is arranged between the first clamping piece (66) and the front leg seat (111), the driving piece (68) comprises a sliding rod (681) arranged between the lower push rod (21) and the upper push rod (22) and capable of being driven by the upper push rod (22) to slide relative to the lower push rod (21) when the upper push rod (22) is folded relative to the lower push rod (21), the activity block (67) is pivoted with a driving rod (682), a pull rope (683) capable of pulling the driving rod (682) to make the activity block (67) rotate is arranged between the sliding rod (681) and the driving rod (682), and a fourth reset spring (684) capable of pushing the driving rod (682) to move and reset is further arranged in the lower push rod (21).

9. The stroller frame of claim 8, wherein: The upper push rod (22) is provided with a first connecting seat (221) at its lower end, the lower push rod (21) is provided with a second connecting seat (212) at its upper end, the first connecting seat (221) and the second connecting seat (212) are rotatably connected, the sliding rod (681) is provided with a horizontal shaft (685) at its upper end, the first connecting seat (221) is provided with an arc-shaped slot (71) for the horizontal shaft (685) to pass through, the arc-shaped slot (71) comprises a clearance section (711) and a driving section (712) connected with the clearance section (711), the distance from the clearance section (711) to the rotating shaft of the upper push rod (22) and the lower push rod (21) is constant from the starting end to the terminal end of the clearance section (711), the distance from the driving section (712) to the rotating shaft of the upper push rod (22) and the lower push rod (21) gradually decreases from the starting end to the terminal end of the driving section (712), and the terminal end of the clearance section (711) is connected with the starting end of the driving section (712).

10. The stroller frame of claim 9, wherein: The second connecting seat (212) is provided with a clamping slot (81) in its radial direction, the first connecting seat (221) is provided with a clamping shaft (82) which can slide in the first connecting seat (221) and can be clamped or separated from the clamping slot (81), the second connecting seat (212) is further provided with an arc-shaped clearance slot (83) which is communicated with the clamping slot (81) and can move in the second connecting seat (212) along the circumferential direction, the clamping shaft (82) is connected with a sliding block (84), the upper push rod (22) is provided with a pull rope (85) which can pull the sliding block (84) to slide, the upper push rod (22) is provided with a switch (86) connected with the pull rope (85), and the upper push rod (22) is further provided with a third reset spring (87) which can push the sliding block (84) to move and reset.

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