CN221273167U

CN221273167U - Child cart

Info

Publication number: CN221273167U
Application number: CN202323377727.5U
Authority: CN
Inventors: 廖整辉
Original assignee: Zhongshan Xingshang Baby Product Co ltd
Current assignee: Zhongshan Xingshang Baby Product Co ltd
Priority date: 2023-09-15
Filing date: 2023-12-11
Publication date: 2024-07-05
Anticipated expiration: 2033-12-11
Also published as: CN117622294A

Abstract

The utility model discloses a child stroller, which can move from an unfolding state to a folding state after unlocking a locking device, and comprises a bottom support frame, wherein the bottom support frame comprises front legs, front wheels are connected to the front legs, the bottom support frame also comprises rear legs which are rotatably connected to the front legs, a support rod is rotatably connected to the bottom support frame, a first linkage device which can drive the front legs to rotatably close to the rear legs is arranged between the support rod and the bottom support frame, the rear legs comprise left mounting parts and right mounting parts which are rotatably connected to the left side and the right side of the front legs, the left mounting parts are rotatably connected with left rear legs, the right mounting parts are rotatably connected with right rear legs, second linkage components which can drive the left rear legs and the right rear legs to mutually close are arranged between the bottom support frame and the support rod, and the left rear legs and the right rear legs are both connected with rear wheels. The utility model aims to overcome the defects of the prior art and provide the child cart which is convenient to fold and unfold, simple in folding structure and small in volume after folding.

Description

Child cart

[ Field of technology ]

The utility model relates to a child stroller.

[ Background Art ]

At present, the child cart has become an indispensable article for the child in the growth process. The children's barrow on the market can be folded or unfolded generally, but the existing children's barrow is complex in transmission structure, more in connecting rods and larger in volume after folding. Therefore, a child stroller with a simple structure and a small size after folding is very desirable.

The utility model further provides a novel embodiment.

[ utility model ]

The utility model aims to overcome the defects of the prior art and provide the child cart which is convenient to fold and unfold, simple in folding structure and small in volume after folding.

The utility model is realized by the following technical scheme:

The utility model provides a children's shallow, can remove to folding state from the expansion state after unblock locking device, includes bottom sprag frame 1, bottom sprag frame 1 include preceding leg 11, preceding leg 11 on be connected with front wheel 111, bottom sprag frame 1 still including around first axis A rotate the rear leg 12 of being connected on preceding leg 11, bottom sprag frame 1 on rotate around second axis B and be connected with vaulting pole 2, vaulting pole 2 and bottom sprag frame 1 between be equipped with and can drive the first aggregate unit 3 that preceding leg 11 rotated the folding to rear leg 12 when the relative bottom sprag frame 1 of vaulting pole 2 rotates around second axis B, rear leg 12 including respectively around first axis A rotate and be connected in left installation department 121 and the right installation department 122 of the left and right sides of preceding leg 11, left installation department 121 on rotate around third axis C and be connected with left rear leg 123, right installation department 122 on rotate around fourth axis D and be connected with right rear leg 124, bottom sprag frame 1 and vaulting pole 2 between be equipped with and can drive the left and right rear leg 124 and the left and right leg 124 when the relative bottom sprag frame 2 rotates around second axis B and the relative rear leg 123 and the left and right leg 124.

The bottom support frame 1 is rotatably connected with a support 5 around a fifth axis E, the support 5 is provided with a seat part 6 which can be unfolded or folded by rotating relative to the support, and the other end of the seat part 6 can be connected to the stay bar 2 when the seat part 6 is in an unfolded state.

The second linkage assembly 4 comprises a first linkage rod 41 with one end rotatably connected to the left rear leg 123 around a sixth axis F, the right rear leg 124 is connected with a second linkage rod 42 with one end rotatable relative to the seventh axis G, and a folding assembly 43 capable of driving the first linkage rod 41 and the second linkage rod 42 to be close to each other when the stay rod 2 rotates towards the rear leg 12 is arranged among the stay rod 2, the front leg 11, the first linkage rod 41 and the second linkage rod 42.

The folding assembly 43 comprises a third linkage rod 431 with one end rotatably connected to the front leg 11 around an eighth axis H, the other end of the third linkage rod 431 is connected with a mounting seat 432, the mounting seat 432 is rotatably connected to the third linkage rod 431 around a ninth axis I, the mounting seat 432 is connected with a connecting seat 433, a fourth linkage rod 434 capable of rotating relative to the connecting seat 433 and the supporting rod 2 is arranged between the connecting seat 433 and the supporting rod 2, one end of the fourth linkage rod 434 is rotatably connected to the connecting seat 433 around an eleventh axis K, the other end of the fourth linkage rod 434 is rotatably connected to the supporting rod 2 around a twelfth axis L, the other end of the first linkage rod 41 is rotatably connected to the connecting seat 433 around a thirteenth axis M, and the other end of the second linkage rod 42 is rotatably connected to the connecting seat 433 around a fourteenth axis N.

The ninth axis I is parallel to the eleventh axis K, and the thirteenth axis M and the fourteenth axis N are collinear and intersect the ninth axis I and the eleventh axis K.

The support rod 2 is also rotatably connected with a backrest 71 around a fifteenth axis O, the support rod 2 is also connected with a sliding sleeve 72 capable of sliding along the backrest, a linkage rod 73 capable of rotating relative to the sliding sleeve 72 and driving the backrest 71 to approach the support rod 2 when the sliding sleeve 72 slides is arranged between the sliding sleeve 72 and the backrest 71, one end of the linkage rod 73 is rotatably connected with the backrest 71 around a sixteenth axis P, and the other end of the linkage rod 73 is rotatably connected with the sliding sleeve 72 around a seventeenth axis Q.

The first linkage device 3 comprises a first linkage shaft 31 transversely penetrating through a left rear leg 123, a front leg 11, a supporting rod 2 and a right rear leg 124, wherein the supporting rod 2 is provided with a first jacking groove 32 capable of pushing the first linkage shaft 31 to move when the supporting rod 2 rotates towards the rear leg 12, the left rear leg 123 and the right rear leg 124 are respectively provided with a guide chute 34 for the first linkage shaft 31 to slide inwards, the front leg 11 is provided with a second jacking groove 33 opposite to the first jacking groove 32, the first linkage shaft 31 is simultaneously penetrated into the first jacking groove 32, the second jacking groove 33 and the guide chute 34, and the second jacking groove 33 is jacked by the first linkage shaft 31 in the process of rotating towards the rear leg 12 so that the front leg 11 and the rear leg 12 rotate towards each other.

The first jacking groove 32 is an arc-shaped groove, a first jacking surface 321 capable of pushing the first linkage shaft 31 is arranged on the first jacking groove 32, the second jacking groove 33 is an arc-shaped groove, and a second jacking surface 331 capable of being jacked by the first linkage shaft 31 is arranged on the second jacking groove 33.

The seat part 6 and the supporting rod 2 are provided with a locking assembly 8 capable of locking the seat part 6 and the supporting rod 2, the seat part 6 is provided with a connecting shaft 61, the locking assembly 8 comprises a rotating piece 81 which is arranged on the supporting rod 2 and can rotate relative to the rotating piece 81, the rotating piece 81 is provided with a bayonet 811 which can be used for clamping the connecting shaft 61 and can enclose a locking space 100 with the supporting rod 2, the supporting rod 2 is also provided with a locking position 82, the supporting rod 2 is also provided with a locking piece 83 which can rotate relative to the supporting rod 2 and can be clamped into or separated from the locking position 82, when the locking piece 83 is clamped into the locking position 82, the connecting shaft 61 is clamped in the locking space 100, a torsion spring 84 which can push and reset the rotating piece 81 is arranged between the rotating piece 81 and the supporting rod 2, an elastic piece 85 which can push and reset the locking piece 83 is also arranged between the locking piece 83 and the supporting rod 2, the supporting rod 2 is also connected with a push rod 9 which can slide relative to the supporting rod 2, and the push rod 9 is provided with a push part 86 which can separate from the locking piece 83.

The rotating plate 81 is provided with a first abutting surface 812, and the locking member 83 is provided with a second abutting surface 831 which can abut against the first abutting surface 812 to prevent the rotating plate 81 from rotating.

Compared with the prior art, the utility model has the following advantages: when the child stroller needs to be folded, the locking device is unlocked firstly, then the supporting rod is pushed to rotate around the second axis B relative to the front leg and to be close to the rear leg, in the process of pushing the supporting rod to rotate towards the rear leg, the first linkage device is driven by the supporting rod, at the moment, the front leg rotates around the first axis A relative to the rear leg and to be close to the rear leg, meanwhile, the second linkage assembly is driven by the supporting rod, the left rear leg rotates around the third axis C relative to the left mounting part and moves towards the right rear leg, the right rear leg rotates around the fourth axis D relative to the right mounting part and moves towards the left rear leg, so that the right rear leg and the left rear leg are close to each other, and when the front leg is close to the right rear leg and the left rear leg, the whole child stroller is folded, the space occupied by the folded child stroller is small, and the child stroller is more convenient to place and carry. When the child stroller is folded, the front legs can be folded to the right rear legs and the left rear legs only by rotating the stay bars to close to the rear legs after the locking device is unlocked, and meanwhile, the right rear legs and the left rear legs are folded to each other, so that the folding operation is convenient, and the folded child stroller occupies a small volume.

[ Description of the drawings ]

FIG. 1 is one of the perspective views of the child stroller of the present utility model;

FIG. 2 is a second perspective view of the child stroller of the present utility model;

FIG. 3 is a side view of the child stroller of the present utility model;

FIG. 4 is an exploded view of the child stroller of the present utility model;

FIG. 5 is one of the exploded views of the first linkage in the stroller of the present utility model;

FIG. 6 is a second exploded view of the first linkage in the stroller of the present utility model;

FIG. 7 is a cross-sectional view of the locking assembly of the child stroller of the present utility model;

FIG. 8 is a cross-sectional view of the child stroller with the locking assembly unlocked;

FIG. 9 is a perspective view of the locking member, the rotating plate and the torsion spring of the child stroller of the present utility model;

FIG. 10 is a perspective view of a push rod in the stroller of the present utility model;

FIG. 11 is a perspective view of a second linkage in the stroller of the present utility model;

FIG. 12 is a side view of the child stroller of the present utility model folded;

FIG. 13 is a perspective view of the child stroller of the present utility model folded;

fig. 14 is a perspective view of another armrest of the stroller of the present utility model.

[ Detailed description ] of the invention

The utility model is further described below with reference to the accompanying drawings:

As shown in fig. 1 to 14, the utility model provides a stroller, which can move from an unfolded state to a folded state after unlocking a locking device, and comprises a bottom support frame 1, wherein the bottom support frame 1 comprises a front leg 11, the front leg 11 is connected with a front wheel 111, the bottom support frame 1 further comprises a rear leg 12 which is rotationally connected to the front leg 11 around a first axis a, the bottom support frame 1 is rotationally connected with a supporting rod 2 around a second axis B, a first linkage device 3 which can drive the front leg 11 to rotationally close to the rear leg 12 when the supporting rod 2 is rotationally folded around the second axis B relative to the bottom support frame 1 is arranged between the supporting rod 2 and the bottom support frame 1, the rear leg 12 comprises a left mounting part 121 and a right mounting part 122 which are rotationally connected to the left and right sides of the front leg 11 around the first axis a, the left mounting part 121 is rotationally connected with a left rear leg 123 around a third axis C, the right mounting part 122 is rotationally connected with a right rear leg 124 around a fourth axis D, and a left and right assembly 123 which can rotationally drive the rear leg 125 to close to each other when the supporting rod 2 and the left support frame 2 are rotationally around the second axis B relative to the bottom support frame 2, and the left leg 124 can be rotationally connected to the right leg 124 when the supporting rod 2 and the left support frame 2 is rotationally close to the left leg 124.

When the child stroller needs to be folded, the locking device is unlocked firstly, then the push stay bar 2 rotates around the second axis B relative to the front leg 11 and moves towards the rear leg 12, in the process of rotating the push stay bar 2 towards the rear leg 12, the first linkage device 3 is driven by the stay bar 2, at the moment, the front leg 11 rotates around the first axis A relative to the rear leg 12 and moves towards the rear leg 12, meanwhile, the second linkage assembly 4 is driven by the stay bar 2, so that the left rear leg 123 rotates around the third axis C relative to the left mounting part 121 and moves towards the right rear leg 124, the right rear leg 124 rotates around the fourth axis D relative to the right mounting part 122 and moves towards the left rear leg 123, so that the right rear leg 124 and the left rear leg 123 move towards each other, and when the front leg 11 moves towards the right rear leg 124 and the left rear leg 123, the whole stroller is folded, the occupied space of the child stroller is more convenient to carry and place. When the child stroller is folded, the front legs 11 can be folded to the right rear legs 124 and the left rear legs 123 only by rotating the stay bars 2 to close to the rear legs 12 after unlocking the locking device, and meanwhile, the right rear legs 124 and the left rear legs 123 can be folded to each other, so that the folding operation is convenient, and the folded child stroller occupies a small volume.

As shown in fig. 3, the bottom bracket 1 is rotatably connected with a support 5 about a fifth axis E, the support 5 is provided with a seat part 6 capable of being unfolded or folded relative to the support 5, and the other end of the seat part 6 is capable of being connected to the stay 2 when the seat part 6 is in an unfolded state. When the child stroller is folded, the support member 5 can rotate about the fifth axis E relative to the front leg 11 and towards the rear leg 12, and the seat portion 6 on the support member 5 can rotate relative to the support member 5 and towards the seat portion 6. When the child stroller is unfolded, the seat part 6 can be connected to the stay bar 2, so that the child stroller is supported more stably and is safer when riding.

As shown in fig. 4 and 11, the second linkage assembly 4 includes a first linkage rod 41 with one end rotatably connected to the left rear leg 123 around a sixth axis F, the right rear leg 124 is connected with a second linkage rod 42 with one end rotatable around a seventh axis G, and a folding assembly 43 capable of driving the first linkage rod 41 and the second linkage rod 42 to be close to each other when the brace rod 2 rotates towards the rear leg 12 is arranged among the brace rod 2, the front leg 11, the first linkage rod 41 and the second linkage rod 42. When the stay bar 2 rotates towards the rear leg 12, the folding assembly 43 is driven to move, the folding assembly 43 not only drives the front leg 11 to rotate towards the rear leg 12, but also enables the first linkage rod 41 to rotate around the sixth axis F relative to the left rear leg 123, and the second linkage rod 42 rotates around the seventh axis G relative to the right rear leg 124, so that the left rear leg 123 and the right rear leg 124 are pulled to be close to each other.

As shown in fig. 4 and 11, the folding assembly 43 includes a third linkage rod 431 with one end rotatably connected to the front leg 11 around an eighth axis H, the other end of the third linkage rod 431 is connected with a mounting base 432, the mounting base 432 is rotatably connected to the third linkage rod 431 around a ninth axis I, the mounting base 432 is connected with a connecting base 433, a fourth linkage rod 434 capable of rotating relative to the connecting base 433 and the brace rod 2 is disposed between the connecting base 433 and the brace rod 2, one end of the fourth linkage rod 434 is rotatably connected to the connecting base 433 around an eleventh axis K, the other end of the fourth linkage rod 434 is rotatably connected to the brace rod 2 around a twelfth axis L, the other end of the first linkage rod 41 is rotatably connected to the connecting base 433 around a thirteenth axis M, and the other end of the second linkage rod 42 is rotatably connected to the connecting base 433 around a fourteenth axis N. When the brace rod 2 rotates towards the rear leg 12, the brace rod 2 pushes the fourth link rod 434, one end of the fourth link rod 434 rotates around the twelfth axis L relative to the brace rod 2, the other end of the fourth link rod 434 rotates around the eleventh axis K relative to the connecting seat 433, at this time, the connecting seat 433 is pushed by the fourth link rod 434 to move, the mounting seat 432 is driven by the connecting seat 433 to move, one end of the first link rod 41 rotates around the sixth axis F relative to the left rear leg 123 during the movement of the connecting seat 433 and the mounting seat 432, the other end rotates around the thirteenth axis M relative to the connecting seat 433, the second link rod 42 rotates around the seventh axis G relative to the right rear leg 124, the other end rotates around the fourteenth axis N relative to the connecting seat 433, the first link rod 41 and the second link rod 42 are mutually pushed towards each other, the left rear leg 123 and the right rear leg 124 are mutually pushed under the driving of the first link rod 41 and the second link rod 42, at the same time, the mounting seat 432 rotates around the ninth axis I relative to the third link rod 431 to move, the third link rod 431 moves around the ninth axis I relative to the third link rod 431, the eighth link rod 431 moves around the eighth axis H relative to the eighth link rod 431, and the eighth link rod 431 is gradually pushed towards the front leg 11, and the front leg 11 is gradually folded towards the front of the child, and the front leg 11 is gradually pushed towards the front by the eighth link rod 11, and the front leg is gradually pulled. And a damping spring can be further arranged on the fourth linkage rod 434, so that a good damping effect is achieved.

As shown in fig. 4 and 11, the ninth axis I is parallel to the eleventh axis K, and the thirteenth axis M and the fourteenth axis N are collinear and intersect with the ninth axis I and the eleventh axis K, so that the stroller can be folded more smoothly.

As shown in fig. 3, the stay bar 2 is further rotatably connected with a backrest 71 around a fifteenth axis O, the stay bar 2 is further connected with a sliding sleeve 72 capable of sliding along the fifteenth axis O, a linkage rod 73 capable of rotating relative to the sliding sleeve 72 and driving the backrest 71 to approach the stay bar 2 when the sliding sleeve 72 slides is arranged between the sliding sleeve 72 and the backrest 71, one end of the linkage rod 73 is rotatably connected with the backrest 71 around a sixteenth axis P, and the other end of the linkage rod 73 is rotatably connected with the sliding sleeve 72 around a seventeenth axis Q. The backrest part 71 is connected with a detachable armrest 74, the armrest 74 is a U-shaped armrest, and can form a protection space with the backrest part 71, so that children can sit more safely when the children are young; the arm rest 74 may also be two separate arm rest bars with a gap therebetween, which is suitable for older children, and which, due to the gap therebetween, facilitates the adult to hold the child or to place the child on the seat portion 6.

When the stay bar 2 rotates towards the rear leg 12, the stay bar 2 drives the sliding sleeve 72 to slide along the stay bar, the sliding sleeve 72 drives the linkage bar 73 to move when sliding, one end of the linkage bar 73 rotates around the seventeenth axis P relative to the backrest 71, the other end of the linkage bar 73 rotates around the seventeenth axis Q relative to the sliding sleeve 72, the linkage bar 73 gradually approaches towards the stay bar 2, and the backrest 71 rotates around the fifteenth axis O relative to the stay bar 2 under the driving of the linkage bar 73. The back portion 71 and the seat portion 6 are of a split design so that the overall child stroller takes up less space.

As shown in fig. 5 and 6, the first linkage device 3 includes a first linkage shaft 31 transversely penetrating through the left rear leg 123, the front leg 11, the brace 2 and the right rear leg 124, the brace 2 is provided with a first pressing groove 32 capable of pushing the first linkage shaft 31 to move when the brace 2 rotates towards the rear leg 12, the left rear leg 123 and the right rear leg 124 are both provided with a guide chute 34 capable of sliding the first linkage shaft 31, the front leg 11 is provided with a second pressing groove 33 opposite to the first pressing groove 32, the first linkage shaft 31 is simultaneously penetrated into the first pressing groove 32, the second pressing groove 33 and the guide chute 34, and the second pressing groove 33 is pressed by the first linkage shaft 31 in the process of rotating towards the rear leg 12 of the brace 2 so that the front leg 11 and the rear leg 12 rotate towards each other.

When the baby stroller frame is folded, the locking device is unlocked firstly, then the stay bar 2 is pushed to rotate towards the rear leg 12, the first jacking groove 32 on the stay bar 2 jacks the first linkage shaft 31 when the stay bar 2 rotates towards the rear leg 12, the first linkage shaft 31 slides in the guide chute 34 and jacks the second jacking groove 33 on the front leg 11 after being jacked by the first jacking groove 32, and the second jacking groove 33 is opposite to the first jacking groove 32, so that the front leg 11 rotates towards the rear leg 12 in the opposite rotation direction of the stay bar 2 after being jacked by the first linkage shaft 31, at the moment, the front leg 11 and the rear leg 12 mutually rotate towards each other, the folding mode is simple, the operation is convenient, and the linkage structure of the frame is reduced by arranging grooves on the rear leg 12, the front leg 11 and the stay bar 2 and then jacking the front leg 12 and the stay bar 2 through the first linkage shaft 31, so that the linkage structure of the frame is reduced.

As shown in fig. 5 and 6, the first pressing groove 32 is an arc groove, a first pressing surface 321 capable of pushing the first linkage shaft 31 is provided on the first pressing groove 32, the second pressing groove 33 is an arc groove, and a second pressing surface 331 capable of being pressed by the first linkage shaft 31 is provided on the second pressing groove 33. When the stay bar 2 rotates relative to the front leg 11, the first pressing surface 321 on the first pressing groove 32 presses the first linkage shaft 31 to move forward, and the first linkage shaft 311 presses the second pressing surface 331 on the second pressing groove 33 after being pressed, so that the front leg 11 and the rear leg 12 rotate towards each other.

As shown in fig. 7 and 8, a locking assembly 8 capable of locking the seat part 6 and the supporting rod 2 is arranged between the seat part 6 and the supporting rod 2, the seat part 6 is provided with a connecting shaft 61, the locking assembly 8 comprises a rotating piece 81 which is arranged on the supporting rod 2 and can rotate relative to the rotating piece 81, a bayonet 811 which can be used for clamping the connecting shaft 61 and can enclose a locking space 100 with the supporting rod 2 is arranged on the rotating piece 81, a locking position 82 is further arranged on the supporting rod 2, a locking piece 83 which can rotate relative to the supporting rod 2 and can be clamped into or separated from the locking position 82 is further arranged on the supporting rod 2, when the locking piece 83 is clamped into the locking position 82, a torsion spring 84 which can push the rotating piece 81 to reset is arranged between the rotating piece 81 and the supporting rod 2, an elastic piece 85 which can push the locking piece 83 to reset is further arranged between the locking piece 83 and the supporting rod 2, a pushing piece 9 which can slide relative to the pushing piece 9 is further arranged in the supporting rod 2, and the pushing piece 83 can be separated from the locking position 82. A first locking component is arranged between the stay bar 2 and the front leg 11 and the rear leg 12, and the first locking component is a shaft pin lock which can be pushed to unlock when the existing push rod 9 slides downwards. A second locking assembly is arranged between the push rod 9 and the stay bar 2, and the second locking assembly is an existing bolt lock.

When the seat part 6 on the baby carriage needs to be folded, the push rod 9 is operated to slide along the supporting rod 2, the pushing part 86 on the supporting rod 2 is gradually contacted with the locking piece 83 and pushes the locking piece 83 to rotate relative to the supporting rod 2, the locking piece 83 is gradually separated from the locking position 82, the locking piece 83 is gradually separated from the rotating piece 81 when rotating, the torsion spring 84 drives the rotating piece 81 to rotate when the locking piece 83 is separated from the rotating piece 81, the locking space 100 is gradually released when the rotating piece 81 rotates, the bayonet 811 on the rotating piece 81 is gradually upwards, the seat part 6 is rotated, and the connecting shaft 61 on the seat part 6 can be separated from the bayonet 811. The torsion spring 84 is in a compressed state and the elastic member 85 is in an initial state when the seat portion 6 is in the locked state; when the seat portion 6 is in the unlocked state, the torsion spring 84 is in an initial state and the elastic member 85 is in a compressed state.

As shown in fig. 7 and 8, the rotating plate 81 is provided with a first abutment surface 812, and the locking member 83 is provided with a second abutment surface 831 capable of abutting against the first abutment surface 812 to prevent the rotating plate 81 from rotating. The first abutting surface 812 and the second abutting surface 831 cooperate to abut against the locking member 83, so that the locking member 83 can prevent the rotation of the rotating plate 81 when being locked in the locking position 82, and the locking is more stable and safer.

Claims

1. A child stroller movable from an unfolded state to a folded state upon unlocking a locking device, characterized in that: including bottom sprag frame (1), bottom sprag frame (1) include preceding leg (11), preceding leg (11) on be connected with front wheel (111), bottom sprag frame (1) still including around first axis (A) rotate rear leg (12) of being connected on preceding leg (11), bottom sprag frame (1) on rotate around second axis (B) and be connected with vaulting pole (2), vaulting pole (2) and bottom sprag frame (1) between be equipped with around second axis (B) at vaulting pole (2) and rotate first aggregate unit (3) that can drive preceding leg (11) to rear leg (12) and rotate and draw close when folding relative bottom sprag frame (1), rear leg (12) including respectively around first axis (A) rotate left installation department (121) and right installation department (122) of being connected in preceding leg (11) left and right both sides, left installation department (121) on rotate around third axis (C) and be connected with left rear leg (123), right installation department (122) on right installation department (122) rotate around third axis (D) and be connected with right leg (124), the bottom support frame (1) and the stay bar (2) between be equipped with can drive left back leg (123) and right back leg (124) second linkage subassembly (4) that draw close each other when stay bar (2) rotate folding around second axis (B) relative to bottom support frame (1), left back leg (123) and right back leg (124) on all be connected with rear wheel (125).

2. The stroller of claim 1, wherein: the bottom support frame (1) is rotatably connected with a support piece (5) around a fifth axis (E), the support piece (5) is provided with a seat part (6) which can be unfolded or folded relative to the support piece in a rotating way, and when the seat part (6) is in an unfolded state, the other end of the seat part (6) can be connected to the stay bar (2).

3. The stroller of claim 1, wherein: the second linkage assembly (4) comprises a first linkage rod (41) with one end rotatably connected to a left rear leg (123) around a sixth axis (F), a second linkage rod (42) with one end relatively rotated around a seventh axis (G) is connected to a right rear leg (124), and a folding assembly (43) with one end relatively rotated around the seventh axis (G) is arranged between the support rod (2), the front leg (11), the first linkage rod (41) and the second linkage rod (42), wherein the folding assembly (43) can drive the first linkage rod (41) and the second linkage rod (42) to be mutually closed when the support rod (2) rotates towards the rear leg (12).

4. A stroller according to claim 3, wherein: folding subassembly (43) include that one end is connected in third gangbar (431) on foreleg (11) around eighth axis (H) rotation, third gangbar (431) other end be connected with mount pad (432), mount pad (432) rotate around ninth axis (I) and connect in third gangbar (431) on, mount pad (432) on be connected with connecting seat (433), connecting seat (433) and vaulting pole (2) between be equipped with fourth gangbar (434) that can rotate relative to the two, fourth gangbar (434) one end rotate around eleventh axis (K) and connect in connecting seat (433), fourth gangbar (434) other end rotate around twelfth axis (L) and connect in vaulting pole (2) on, first gangbar (41) other end rotate around thirteenth axis (M) and connect in connecting seat (433), second gangbar (42) other end rotate around fourteenth axis (N) and connect in connecting seat (433).

5. The stroller of claim 4, wherein: the ninth axis (I) is parallel to the eleventh axis (K), and the thirteenth axis (M) and the fourteenth axis (N) are collinear and intersect the ninth axis (I) and the eleventh axis (K).

6. The stroller of claim 1, wherein: the support rod (2) on still be connected with back portion (71) around fifteenth axis (O) rotation, support rod (2) on still be connected with sliding sleeve (72) that can follow its slip, sliding sleeve (72) and back portion (71) between be equipped with can rotate and can drive back portion (71) to trace back portion (2) trace (73) when sliding sleeve (72) slide, trace (73) one end rotate around sixteenth axis (P) and connect on back portion (71), trace (73) other end rotate around seventeenth axis (Q) and connect on sliding sleeve (72).

7. The stroller of claim 1, wherein: the first linkage device (3) comprises a left rear leg (123), a front leg (11), a supporting rod (2) and a first linkage shaft (31) in a right rear leg (124) which are transversely penetrated, the supporting rod (2) is provided with a first jacking groove (32) which can push the first linkage shaft (31) to move when the supporting rod (2) rotates towards the rear leg (12), the left rear leg (123) and the right rear leg (124) are respectively provided with a guide chute (34) which can enable the first linkage shaft (31) to slide in, the front leg (11) is provided with a second jacking groove (33) opposite to the first jacking groove (32), the first linkage shaft (31) is simultaneously penetrated into the first jacking groove (32), the second jacking groove (33) and the guide chute (34), and the second jacking groove (33) receives the first linkage shaft (31) in the process that the supporting rod (2) rotates towards the rear leg (12) to enable the front leg (12) to rotate towards each other.

8. The stroller of claim 7, wherein: the first jacking groove (32) is an arc-shaped groove, a first jacking surface (321) capable of pushing the first linkage shaft (31) is arranged on the first jacking groove (32), the second jacking groove (33) is an arc-shaped groove, and a second jacking surface (331) capable of being jacked by the first linkage shaft (31) is arranged on the second jacking groove (33).

9. The stroller of claim 2, wherein: the utility model provides a push rod (9) that can reset between the jack rod (2), jack rod (2) on still be equipped with locking position (82), jack rod (2) on still be equipped with can rotate and block in or break away from locking position (82) closure member (83) when locking member (83) block in locking position (82) in connecting axle (61) by the lock in locking space (100) between rotating piece (81) be equipped with between rotating piece (81) and jack rod (2) can supply connecting axle (61) card to go into and can enclose into bayonet socket (811) of kayser space (100) with jack rod (2), jack rod (2) on still be equipped with locking position (82), jack rod (2) on still be equipped with can be relative to its elastic connection of push rod (85) that can reset between locking member (83) and jack rod (2), the push rod (9) is provided with a pushing part (86) which can push the locking piece (83) to be separated from the locking position (82).

10. The stroller of claim 9, wherein: the locking piece (83) is provided with a second propping surface (831) which can prop against the first propping surface (812) mutually to prevent the rotating piece (81) from rotating.