CN116176681A - Child cart - Google Patents

Abstract

The invention discloses a child cart, which has an unfolding state and is characterized in that: in the unfolding state, the child stroller comprises a bottom frame, a wheel assembly arranged at the bottom of the bottom frame, a seat mechanism arranged on the bottom frame, and a push rod frame extending in the up-down direction and positioned behind the seat mechanism, wherein the seat mechanism comprises a seat and a connecting rod assembly connected between the seat and the bottom frame, the child stroller is in the unfolding state, the seat mechanism has a first working state and a second working state, the seat mechanism is in the first working state, and the connecting rod assembly is supported between the bottom frame and the seat in the up-down direction; the seat mechanism is in the second working state, and the connecting rod assembly and the seat are folded relative to the underframe. The child stroller can be used for adjusting the height of a seat in an unfolding state, has two working states, is not single in use mode, is flat and regular in shape after being folded, and is easy to store.

Description

Child cart

Technical Field

The invention relates to the field of children products, in particular to a child trolley.

Background

The existing child cart comprises a foldable cart frame, a seat on the cart frame is usually fixed and not adjustable when the cart frame is in an open state, and the child is more single in riding the child cart, so that the fun is reduced. In addition, the child cart in the prior art mostly has the problem of irregular shape after being folded, and is unfavorable for storage, arrangement and daily carrying.

Disclosure of Invention

It is an object of the present invention to provide a new construction stroller that solves one or more of the problems of the prior art.

In order to achieve the above purpose, the invention adopts the following technical scheme: a stroller having a deployed state in which the stroller comprises a chassis, a wheel assembly disposed at a bottom of the chassis, a seat mechanism disposed on the chassis, and a push rod frame extending in a vertical direction and positioned behind the seat mechanism, the seat mechanism comprising a seat, a link assembly connected between the seat and the chassis, the stroller in the deployed state having a first operational state in which the link assembly is supported between the chassis and the seat, and a second operational state in which the link assembly is supported in the vertical direction; the seat mechanism is in the second working state, and the connecting rod assembly and the seat are folded relative to the underframe.

Preferably, the connecting rod assembly comprises a front swing rod and a rear swing rod, one end part of the front swing rod is rotatably connected with the seat around a first axial lead, and the other end part of the front swing rod is rotatably connected with the underframe around a second axial lead; one end of the rear swing rod is rotatably connected with the seat around a third axial lead, the other end of the rear swing rod is rotatably connected with the bottom frame around a fourth axial lead, wherein the first axial lead, the second axial lead, the third axial lead and the fourth axial lead are mutually parallel and extend along the left-right direction, the first axial lead is positioned in front of the third axial lead, and the second axial lead is positioned in front of the fourth axial lead.

Preferably, the seat comprises a base, a seat plate rotatably provided on the base around a rotation center line extending in a vertical direction, and the link assembly is connected between the base and the chassis.

Further preferably, the lower portion of the push rod rest is connected to the rear portion of the chassis, and the distance between the seat mechanism and the push rod rest in the front-rear direction in the first operation state is larger than the distance between the seat mechanism and the push rod rest in the front-rear direction in the second operation state.

Further, the child stroller further comprises a housing fixedly arranged on the underframe, a containing cavity is formed in the upper portion of the housing, and when the child stroller is in the second working state, the connecting rod assembly is contained in the containing cavity.

Further, the seat mechanism further comprises a backrest, the lower portion of the backrest is rotatably connected with the lower portion of the seat, the child stroller further has a folded state, the child stroller is in the folded state, the backrest is folded above the seat, and the backrest closes the mouth of the accommodating cavity from above.

Preferably, the chassis comprises a main body frame, two groups of wheel frames which are respectively arranged at the left side part and the right side part of the main body frame and extend along the front-back direction, a group of front wheel assemblies are respectively arranged at the front parts of the wheel frames, a group of rear wheel assemblies are respectively arranged at the rear parts of the wheel frames, and the wheel frames can be connected with the main body frame in a relatively rotating manner around a rotation center line extending along the front-back direction.

Further, the main body frame is provided with a connecting rod extending along the front-back direction, the wheel frame comprises a rotating rod extending along the front-back direction, the rotating rod can be rotatably inserted into a rod cavity of the connecting rod around the axis of the rotating rod, and a locking mechanism for locking the rotating rod and the connecting rod relatively is further arranged between the rotating rod and the connecting rod.

Preferably, the lower part of the push rod frame is connected to the rear part of the bottom frame, the child stroller further has a folded state, when the child stroller is in the folded state, the seat mechanism is in the second working state, the push rod frame is folded at the bottom of the bottom frame, and a fixing piece for fixing the push rod frame is further arranged at the bottom of the bottom frame.

Further, the push rod frame comprises a push rod which can stretch along the length direction of the push rod frame; the front wheel assembly comprises a front wheel seat connected with the wheel frame, a front wheel body rotatably mounted on the front wheel seat around a front wheel shaft, the rear wheel assembly comprises a rear wheel seat connected with the wheel frame, and a rear wheel body rotatably mounted on the rear wheel seat around a rear wheel shaft, the stroller is in a folded state, the push rod frame is folded at the middle position of the bottom frame, the front wheel shaft and the rear wheel shaft extend along the vertical direction, the two groups of front wheel bodies are respectively arranged at the left side and the right side of the push rod frame, and the two groups of rear wheel bodies are respectively arranged at the left side and the right side of the push rod frame.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the child cart is in the unfolded state, and the seat mechanism has two different working states, so that the child has different sitting postures and use experiences when riding the child cart, riding fun of the child is increased, and great convenience is provided for a user to take care of the child.

Drawings

FIG. 1 is a schematic perspective view of a stroller (without a housing) according to an embodiment of the present invention;

FIG. 2 is an exploded view of the stroller of FIG. 1;

FIG. 3 is an exploded schematic view of a seat in the stroller of FIG. 1;

FIG. 4 is a schematic view of the center of rotation of a portion of the bars of the stroller of FIG. 1;

FIG. 5 is a schematic view of the child stroller of FIG. 1;

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a schematic view of the chassis structure of the stroller of FIG. 5;

FIG. 8 is a schematic view of the internal structure of the region A of FIG. 7;

FIG. 9 is a partially exploded view of FIG. 7;

FIG. 10 is a schematic view of the internal structure of region B of FIG. 9;

FIG. 11 is a top view of the housing of the stroller of FIG. 5;

FIG. 12 is a top view of the housing of FIG. 11 secured to a chassis;

FIG. 13 is a schematic perspective view of the child stroller of FIG. 5 with the backrest adjusted;

FIG. 14 is a side view of FIG. 13;

FIG. 15 is a schematic perspective view of the child stroller of FIG. 5 with the seat rotated back;

FIG. 16 is a side view of FIG. 15;

FIG. 17 is a schematic perspective view of the stroller of FIG. 5 in a second operative condition;

FIG. 18 is a side view of FIG. 17 and a child seat schematic;

FIG. 19 is a schematic view of the chassis after the wheel assembly is flipped over;

FIG. 20 is an internal schematic view of region C of FIG. 19;

FIG. 21 is a schematic view of a first step in the folding process of the stroller of FIG. 5;

FIG. 22 is a schematic view of a second step in the folding process of the stroller of FIG. 5;

FIG. 23 is a schematic perspective view of the bottom view of FIG. 22;

FIG. 24 is a schematic view of a third step in the folding process of the stroller of FIG. 5;

FIG. 25 is a schematic view of a fourth step in the folding process of the stroller of FIG. 5;

FIG. 26 is a schematic perspective view of the bottom view of FIG. 25;

FIG. 27 is a schematic perspective view of the child stroller of FIG. 5 in a collapsed configuration;

fig. 28 is a bottom view of fig. 27;

wherein: 1. a chassis; 11. a main body frame; 111. a connecting rod; 111a, first perforations; 112. a front cross bar; 112a, a cross bar section; 112b, an extension; 113. a rear connecting rod; 12. a wheel carrier; 121. a rotating frame; 121a, a second perforation; 13. a locking mechanism; 131. unlocking the operating member; 131a, an unlocking operation part; 131b, a main body portion; 132. locking a column; 133. an elastic member; 14. a fixing member;

2. a seat mechanism; 21. a seat; 211. a base; 212. a seat plate; 21a, a fixed shaft; 21b, mounting holes; 22. a connecting rod assembly; 221. a front swing rod; 222. a rear swing rod; 23. a backrest; 24. an armrest;

3. a push rod frame; 31. an upper push rod; 32. a push rod is downwards pushed;

4. a housing; 41. a housing chamber;

5. a front wheel assembly; 51. a front wheel seat; 52. a front wheel body; 53. a front axle;

6. a rear wheel assembly; 61. a rear wheel seat; 62. a rear wheel body; 63. rear wheel axle.

X1, a first axis; x2, a second axis; x3, a third axis; x4, a fourth axis; x5, a fifth axis; x6, a sixth axis; x7, a rotation center line; x8, eighth axis;

Detailed Description

The following description of the directions related to up, down, left, right, front, rear, inner, outer, etc. are defined with reference to the directions observed by a pusher pushing the stroller in the unfolded state, and are only used for clearly explaining the relative positional relationship of the rod members on the stroller.

The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments.

Referring to fig. 1 to 28, the stroller has an unfolded state in which the stroller includes a chassis 1, front and rear wheel assemblies 5 and 6 provided at the bottom of the chassis 1, a seat mechanism 2 provided on the chassis 1, and a push rod rest 3 extending in an up-down direction and located behind the seat mechanism 2, and the seat mechanism 2 includes a seat 21, and a link assembly 22 connected between the seat 21 and the chassis 1. The stroller is in a deployed state, the seat mechanism 2 has a first working state and a second working state which can be switched, the seat mechanism 2 is in the first working state, as shown in fig. 1, 5 and 6, the link assembly 22 is supported between the underframe 1 and the seat 21 along the up-down direction, the seat 21 is in a higher height, and in the working state, the child can sit on the seat 21 and has a higher riding height; when the seat mechanism 2 is shifted to the second operating state, as shown in fig. 17 and 18, the link assembly 22 and the seat 21 are folded with respect to the chassis 1, and the seat 21 is at a lower level.

Referring to the drawings, the seat 21 includes a base 211, a seat plate 212 rotatably provided on the base 211 about an eighth axis X8 extending in the up-down direction, and a backrest 23 rotatably provided at the rear of the seat 21, the seat plate 212 extending in the front-rear direction, the seat plate 212 being provided at a lower portion thereof with a fixed shaft 21a extending in the up-down direction, the base 211 being provided with a mounting hole 21b corresponding to the fixed shaft 21a, the fixed shaft 21a being inserted downward into the mounting hole 21b to connect the seat plate 212 with the base 211, and the seat plate 212 being rotatable about an axis of the fixed shaft 21a, i.e., the eighth axis X8, with respect to the base 211 to adjust the direction of the seat 21 so that a child can face forward against the occupant or face backward against the occupant while sitting on the child stroller. The base 211 is also provided with a locking member (not shown) by which the seat 21 is locked after the seat 21 is adjusted to restrict the relative movement between the seat plate 212 and the base 211.

Referring to fig. 1 to 6, in the unfolded state, the backrest 23 extends in the up-down direction, the lower portion of the backrest 23 is rotatably connected with the rear portion of the seat 21 about a fifth axis X5, and a backrest locking mechanism (not shown) is provided between the backrest 23 and the seat 21, which can flip the backrest 23 to different angles about the fifth axis X5 and lock the same, so that a child can sit on the seat mechanism 2 at different leaning angles. In this embodiment, the seat mechanism 2 is further provided with a handrail 24, the handrail 24 is a U-shaped rod with a rearward opening, and in the unfolded state, the handrail 24 extends downward from front to rear for forming a protection against falling of the child on the seat 21 on the front side of the body of the child on the seat 21, where the lower part of the handrail 24, the lower part of the backrest 23, and the rear part of the seat 21 are rotatably connected about the fifth axis X5. In other embodiments, the lower portion of the backrest 23 and the rear portion of the seat 21 may be rotatably coupled, while the lower portion of the armrest 24 is rotatably coupled to one of the two.

Referring to the drawings, the link assembly 22 is connected to the seat 21 at an upper portion thereof and to the chassis 1 at a lower portion thereof. Specifically, the link assembly 22 includes a front swing link 221 and a rear swing link 222, where the front swing link 221 is a U-shaped rod with a downward opening, the rear swing link 222 is an independent rod and is located behind the front swing link 221, when the seat mechanism 2 is in the first working state, the front swing link 221 and the rear swing link 222 extend from front to back, respectively, the upper part of the front swing link 221 is rotationally connected with the base 221 around the first axis X1, and the lower part of the front swing link 221 is rotationally connected with the chassis 1 around the second axis X2; the upper part of the rear swing rod 222 is rotatably connected with the base 221 around a third axis X3, and the lower part of the rear swing rod 222 is rotatably connected with the chassis 1 around a fourth axis X4, wherein the first axis X1, the second axis X2, the third axis X3 and the fourth axis X4 are mutually parallel and extend along the left-right direction, the first axis X1 is positioned in front of the third axis X3, and the second axis X2 is positioned in front of the fourth axis X4. The front swing link 221 and the rear swing link 222 swing back and forth relative to the chassis 1 and the seat mechanism 2, so that the seat mechanism 2 is lifted and lowered to switch between the first operating state and the second operating state.

The push rod frame 3 can be folded along the length direction of the push rod frame 3, the push rod frame 3 is of a telescopic structure, the push rod frame 3 specifically comprises an upper push rod 31 and a lower push rod 32, the lower push rod 32 is provided with a hollow rod cavity in which the upper push rod 31 is sleeved and inserted, the upper push rod 31 can slide along the length direction of the push rod in the rod cavity of the lower push rod 32, meanwhile, a plurality of lock holes (not shown in the figure) are formed in the rod wall of the lower push rod 32, lock pins (not shown in the figure) are arranged at the lower part of the upper push rod 31, the upper push rod 31 is fixed at different positions of the lower push rod 32 through the locking of the lock pins and the lock holes, the push rod frame 3 stretches to different lengths, and the lower part of the push rod frame 3 is rotationally connected to the rear part of the underframe 1 around a sixth axis X6 extending in the left-right direction. When the child stroller is folded, the push rod frame 3 can be folded along the length direction of the child stroller, and then overturned around the sixth axis X6 and folded below the underframe 1.

Referring to fig. 2 and 7 to 10, the chassis 1 includes a main body frame 11, two sets of wheel frames 12 respectively provided at left and right sides of the main body frame 11 and extending in a front-rear direction, connecting bars 111 respectively provided at left and right sides and extending in the front-rear direction on the main body frame 11, a front cross bar 112 and a rear link 113 provided between the connecting bars 111 at left and right sides, the front cross bar 112 being located in front of the rear link 113. Referring to fig. 7 and 9, the front rail 112 includes a rail section 112a extending in a left-right direction and a horizontal rearward extension 112b, the extension 112b being located in the middle of the rail section 112a such that the front rail 112 is T-shaped as a whole, a front swing link 221 of the link assembly 22 is rotatably connected to the rail section 112a of the front rail 112 about a second axis X2, and a rear swing link 222 of the link assembly 22 is rotatably connected to the rear of the extension 112b about a fourth axis X4. The rear link 113 extends in the front-rear direction, the rear link 113 is a V-shaped rod with a forward opening, the left and right sides of the front portion of the rear link 113 are respectively fixed to the connecting rods 111 of the side, and the putter frame 3 is rotatably connected to the rear portion of the rear link 113 about the sixth axis X6. In this embodiment, the bottom of the front cross bar 112 is further provided with a fixing member 14 for fixing the push rod frame 3, as shown in fig. 23 and 26, the fixing member 14 is located at a middle position of the front cross bar 112, and in a folded state, the push rod frame 3 is folded around the sixth axis X6 and then can be fixed on the chassis 1 through the fixing frame 14 after being rotated around the sixth axis X6.

The wheel frame 12 has two sets of wheel frames 12 respectively disposed at left and right sides of the main body frame 11 and extending in front and rear directions, a set of front wheel assemblies 5 are disposed at front portions of the wheel frames 12 at left and right sides, a set of rear wheel assemblies 6 are disposed at rear portions of the wheel frames, the front wheel assemblies 5 include a front wheel seat 51 connected with the wheel frame 12, a front wheel body 52 rotatably mounted on the front wheel seat 51 around a front wheel shaft 53, the rear wheel assemblies 6 include a rear wheel seat 61 connected with the wheel frame 12, and a rear wheel body 62 rotatably mounted on the rear wheel seat 61 around a rear wheel shaft 63, in this embodiment, the front wheel assemblies 5 are universal wheels, and brake mechanisms are disposed on the rear wheel assemblies 6 at left and right sides, and the rear wheel body 62 can be braked by the disposed brake mechanisms.

The wheel frame 12 is connected to the main body frame 11 so as to be rotatable about a rotation center line X7 extending in the front-rear direction on each of the left and right sides of the chassis 1. Specifically, the connection rod 111 is provided with a hollow rod cavity, the wheel frame 12 includes a rotation rod 121 extending in the front-rear direction, and the rotation rod 121 is rotatably inserted in the rod cavity of the connection rod 111 about its own axis. In this embodiment, a locking mechanism 13 for locking the rotating rod 121 and the connecting rod 111 is further disposed between the rotating rod 121 and the connecting rod 111 on the same side, the locking mechanism 13 includes an unlocking operation member 131, a lock post 132 and an elastic member 133, wherein the unlocking operation member 131 is rotatably disposed on the rear connecting rod 113, and has an unlocking operation portion 131a and a main body portion 131b, the length extending direction of the lock post 132 is perpendicular to the length extending direction of the rotating rod 121, and one end of the lock post 132 is rotatably disposed on the main body portion 131 b; the elastic member 133 is specifically a spring provided between the unlocking operation portion 131a and the rear link 113 to provide a force required for the unlocking operation portion 131a to move away from the rotating lever 121. Here, the unlocking operation piece 131, the lock cylinder 132, and the elastic piece 133 are provided in a rod cavity in front of the rear link 113, and only the unlocking operation portion 131a is exposed outside the rod cavity for the user to press. The connecting rod 111 is provided with a first perforation 111a on the wall, the rotating rod 121 is provided with a second perforation 121a on the wall, the front wheel assembly 5 and the rear wheel assembly 6 are supported on the ground in the unfolded state of the stroller, the rear wheel shaft 63 extends along the left-right direction, the first perforation 111a is communicated with the second perforation 121a, and the lock post 132 is slidably inserted into the first perforation 111a and the second perforation 121a along the direction perpendicular to the length of the connecting rod 111, so that the wheel frame 12 and the main body frame 11 are mutually locked.

In the locked state, as shown in fig. 8, the unlocking operation member 131 is lifted up by the elastic member 133, and the lock post 132 is inserted into the first through hole 111a and the second through hole 121a which are in communication, and the connection rod 111 and the rotation rod 121 cannot move relatively. Referring to fig. 20, by pressing the unlocking operation member 131, the unlocking operation member 131 moves into the lever cavity against the force of the elastic member 133, in the process, the lock post 132 is lifted, the lock post 132 is withdrawn from the second through hole 121a, the lock between the rotating lever 121 and the connecting lever 111 is released, and the rotating lever 121 can rotate the front wheel assembly 5 and the rear wheel assembly 6 about its own axis. In this embodiment, in addition to the second through hole 121a, the rotating rod 121 is further provided with a plurality of through holes along the circumference of the rod, and the through holes on the rotating rod are communicated with the first through hole 111a of the connecting rod 111, and the locking post 132 is slidably inserted, so that the wheel frame 12 can be locked at different angular positions relative to the main body frame 11.

The chassis 1 is fixedly provided with a housing 4, so that the chassis 1 has a regular and attractive appearance, the housing 4 is provided with a housing cavity 41 at the upper part, and when the seat mechanism 2 of the stroller is in the second working state, the connecting rod assembly 22 is housed in the housing cavity 41, and the seat 21 is housed in the housing cavity 41 or is positioned above the housing cavity 41. Referring to fig. 18, the front of the housing 4 also provides a region for placing feet when a child sits on the seat 21, making the child more comfortable while sitting.

When the stroller of the present embodiment is in the unfolded state, as shown in fig. 1 to 18, the wheel frames 12 on the left and right sides of the chassis 1 are opened with respect to the main body frame 11, so that the two sets of front wheel assemblies 5 and the two sets of rear wheel assemblies 6 are supported on the ground, and the push rod frame 3 is opened with respect to the chassis 1 and is located at the rear of the chassis 1 in an inclined extending manner from front to rear. In this unfolded state, the seat mechanism 2 has a first operating state and a second operating state, and when the seat mechanism 2 is in the first operating state, as shown in fig. 1 to 16, the front swing link 221 and the rear swing link 222 both extend obliquely upward from front to rear and are supported below the seat 21, the seat 21 is located above the chassis 1 and has a high height, and at the same time, the seat 21 is located at a middle position of the stroller in the front-rear direction, and its rear portion has a large distance from the push rod frame 3 in the front-rear direction. Thus, on the one hand, when a child sits on the seat mechanism 2, the angle of the backrest 23 can be adjusted according to the use requirement, so that different leaning experiences are obtained; in the second aspect, the operator can rotate the seat 21 around the eighth axis X8 according to the need of care, so that the child on the seat mechanism 2 faces forward or backward, and the child does not need to be held off the seat 21 during the reversing operation, so that the reversing operation is very convenient; in the third aspect, the gravity center of the child on the child cart is positioned in the middle of the cart, so that the child cart is higher in stability during pushing.

When it is desired to switch the seating unit 2 to the second operational state, see fig. 17 and 18, wherein the seating unit 2 is first switched to forward use, i.e. the child is sitting on the seat 21 facing forward. At this time, the front swing link 221 and the rear swing link 222 are driven to be pivoted downward toward the chassis 1 to be folded, so that the seat mechanism 2 is folded downward and rearward toward the chassis 1. In this second operating state, the seat mechanism 2 extends in the front-rear direction and is accommodated in the accommodation chamber 41 of the housing 4 by the front swing link 221 and the rear swing link 222. The seat 21 is located at the upper portion of the accommodation chamber 41, the backrest 23 is located at the rear portion of the chassis 1 and in front of the push rod rest 3, and the space between the seat mechanism 2 and the push rod rest 3 in the front-rear direction is small. In this second operating condition, the child can sit on the seat 21 and lean against the backrest 23 with the legs supported in a substantially straightened form on the front of the housing 4 and sit on the seat mechanism 2 at a lower height for a different riding experience.

When the stroller needs to be folded, referring to fig. 21 to 28, the link assembly 22 is rotated backward to switch the seat mechanism 2 to the second working state, and then the armrests 24 and the backrest 23 are driven to flip forward and fold over the seat 21; then the upper push rod 31 and the lower push rod 32 are slid to shorten the length, the push rod frame 3 is rotated around the sixth axis X6, so that the push rod frame 3 is overturned and folded to the bottom of the underframe 1 and fixed on the fixing piece 14; pressing the unlocking operation pieces 131 of the left and right side locking mechanisms 13 releases the lock between the connecting rod 111 and the rotating rod 121, so that the both side wheel frames 12 are each rotated in opposite directions with respect to the main body frame 11, and the front wheel body 52 and the rear wheel body 62 are folded toward the bottom of the chassis 1.

In the folded state, referring to fig. 27 and 28, the seat 21 and the link assembly 2 are stacked up and down and are accommodated in the accommodating cavity 41 together with the armrest 24, the backrest 23 extends in the front-rear direction and closes the mouth of the accommodating cavity 41 from above, the push rod frame 3 is folded at the middle position of the chassis 1, the front wheel axle 5 and the rear wheel axle 6 are both converted into extending in the up-down direction, the front wheel body 52 and the rear wheel body 62 are folded at the bottom of the chassis 1, the two sets of front wheel bodies 52 are respectively arranged at the left side and the right side of the push rod frame 3, the two sets of rear wheel bodies 62 are respectively arranged at the left side and the right side of the push rod frame 3, and simultaneously, the front wheel assembly 5 and the rear wheel assembly 6 do not exceed the outside of the shell 4. The appearance of the stroller in the folded state is basically the appearance of the shell 4, and the whole appearance is smooth and regular, so that the stroller is very beneficial to daily carrying and storage of users.

In summary, in the unfolded state of the stroller of this embodiment, the user rotates the link assembly 22 supported between the chassis 1 and the seat 21, so that the seat mechanism 2 is switched between two working states, the use mode of the stroller is increased, the fun of riding children is improved, and in the folded state, the stroller is flat and regular in shape, thereby providing convenience for the caretaker to take in and carry.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A stroller having an expanded configuration, characterized in that: in the unfolding state, the child stroller comprises a bottom frame, a wheel assembly arranged at the bottom of the bottom frame, a seat mechanism arranged on the bottom frame, and a push rod frame extending in the up-down direction and positioned behind the seat mechanism, wherein the seat mechanism comprises a seat and a connecting rod assembly connected between the seat and the bottom frame, the child stroller is in the unfolding state, the seat mechanism has a first working state and a second working state, the seat mechanism is in the first working state, and the connecting rod assembly is supported between the bottom frame and the seat in the up-down direction; the seat mechanism is in the second working state, and the connecting rod assembly and the seat are folded relative to the underframe.

2. The stroller of claim 1, wherein: the connecting rod assembly comprises a front swing rod and a rear swing rod, one end part of the front swing rod is rotatably connected with the seat around a first axial lead, and the other end part of the front swing rod is rotatably connected with the underframe around a second axial lead; one end of the rear swing rod is rotatably connected with the seat around a third axial lead, the other end of the rear swing rod is rotatably connected with the bottom frame around a fourth axial lead, wherein the first axial lead, the second axial lead, the third axial lead and the fourth axial lead are mutually parallel and extend along the left-right direction, the first axial lead is positioned in front of the third axial lead, and the second axial lead is positioned in front of the fourth axial lead.

3. The stroller of claim 1, wherein: the seat comprises a base and a seat plate which can be arranged on the base in a rotating way around a rotation center line extending in the vertical direction, and the connecting rod assembly is connected between the base and the underframe.

4. The stroller of claim 1, wherein: the lower part of the push rod frame is connected with the rear part of the underframe, and the distance between the seat mechanism and the push rod frame along the front-rear direction in the first working state is larger than the distance between the seat mechanism and the push rod frame along the front-rear direction in the second working state.

5. The stroller of claim 1, wherein: the child stroller further comprises a shell fixedly arranged on the underframe, a containing cavity is formed in the upper portion of the shell, and when the child stroller is in the second working state, the connecting rod assembly is contained in the containing cavity.

6. The stroller of claim 5, wherein: the seat mechanism further comprises a backrest, the lower part of the backrest is rotationally connected with the lower part of the seat, the child stroller further has a folded state, the child stroller is in the folded state, the backrest is folded above the seat, and the backrest closes the opening of the accommodating cavity from the upper side.

7. The stroller of claim 1, wherein: the chassis comprises a main body frame and two groups of wheel frames which are respectively arranged at the left side part and the right side part of the main body frame and extend along the front-back direction, wherein a group of front wheel assemblies are arranged at the front parts of the wheel frames, a group of rear wheel assemblies are arranged at the rear parts of the wheel frames, and the wheel frames can be connected with the main body frame in a relative rotation mode around a rotation center line extending along the front-back direction.

8. The stroller of claim 7, wherein: the main body frame is provided with a connecting rod extending along the front-back direction, the wheel frame comprises a rotating rod extending along the front-back direction, the rotating rod can be rotatably inserted into a rod cavity of the connecting rod around the axis of the rotating rod, and a locking mechanism for locking the rotating rod and the connecting rod relatively is further arranged between the rotating rod and the connecting rod.

9. The stroller of claim 7, wherein: the lower part of the push rod frame is connected to the rear part of the bottom frame, the child cart is further provided with a folding state, when the child cart is in the folding state, the seat mechanism is in the second working state, the push rod frame is folded at the bottom of the bottom frame, and a fixing piece used for fixing the push rod frame is further arranged at the bottom of the bottom frame.

10. The stroller of claim 9, wherein: the push rod frame comprises a push rod which can stretch along the length direction of the push rod frame; the front wheel assembly comprises a front wheel seat connected with the wheel frame, a front wheel body rotatably mounted on the front wheel seat around a front wheel shaft, the rear wheel assembly comprises a rear wheel seat connected with the wheel frame, and a rear wheel body rotatably mounted on the rear wheel seat around a rear wheel shaft, the stroller is in a folded state, the push rod frame is folded at the middle position of the bottom frame, the front wheel shaft and the rear wheel shaft extend along the vertical direction, the two groups of front wheel bodies are respectively arranged at the left side and the right side of the push rod frame, and the two groups of rear wheel bodies are respectively arranged at the left side and the right side of the push rod frame.

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