CN221068186U - Barrows - Google Patents

Abstract

The utility model discloses a trolley, which has an unfolding state and a folding state, wherein the trolley comprises two groups of side brackets arranged on the left side and the right side respectively, and a cross brace assembly arranged between the two groups of side brackets, each side bracket comprises a bottom bracket assembly which can be folded along the front-back direction, and a side connecting rod, a rear supporting rod, a backrest rod and a push rod which extend along the up-down direction respectively, the trolley is in the unfolding state, the push rod has a forward working state which extends obliquely from bottom to top and a reverse working state which extends obliquely from bottom to top, and the push rod is in the forward working state in the conversion process of the unfolding state and the folding state; the trolley is in a folded state, the bottom bracket assembly is folded in the front-back direction, the rear stay bar, the side connecting rod, the backrest rod and the push rod are folded at the rear of the bottom bracket assembly, and the folded trolley is compact and neat in structure and convenient to store and carry.

Description

Barrows

Technical Field

The utility model relates to a cart.

Background

The handcart is convenient for people's production life provider, among the prior art, in order to satisfy user's different user demand, partial handcart has forward and two kinds of use state in reverse, and current handcart that can realize two-way use, the handcart structure is different, and folding principle is also different, and this kind of shallow is mostly complicated, can occupy great volume after folding, inconvenient carry and accomodate, has brought very big inconvenience for the user.

Disclosure of Invention

The object of the present utility model is to provide a new trolley.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a cart having an unfolding state and a folding state, the cart comprises two groups of side brackets arranged on the left side and the right side, and a cross brace assembly arranged between the two groups of side brackets, the side brackets on each side comprise a bottom bracket assembly capable of being folded along the front-back direction, and a side connecting rod, a back brace, a backrest rod and a push rod which extend along the up-down direction respectively,

Wherein the upper part of the side connecting rod and the upper part of the rear supporting rod are respectively and rotatably connected to the backrest rod, the lower part of the side connecting rod and the lower part of the rear supporting rod are respectively and rotatably connected to the bottom bracket assembly, and the lower part of the push rod is rotatably connected to the lower part of the backrest rod or rotatably connected to the upper part of the rear supporting rod; the push rod is in a forward working state of obliquely extending from bottom to top and a reverse working state of obliquely extending from bottom to top and forwards in a unfolding state,

The push rod is in the forward working state in the process of converting the unfolding state and the folding state of the trolley; the trolley is in a folded state, the bottom bracket assembly is folded in the front-back direction, and the side connecting rods, the backrest rods and the push rods are folded behind the bottom bracket assembly.

Preferably, the lower part of the push rod is rotatably connected with the lower part of the backrest rod, and the backrest rod and the push rod are mutually fixed during the process of switching the trolley between the unfolded state and the folded state.

Further, the push rod comprises a lower push rod and an upper push rod which can slide and stretch along the length direction, the lower part of the lower push rod is rotationally connected with the lower part of the backrest rod, a handle which can be held is arranged on the upper part of the upper push rod, when the trolley is in the unfolding state, the handle is positioned above the backrest rod, and when the trolley is in the folding state, the handle is close to the upper part of the backrest rod.

Preferably, the upper part of the side connecting rod is rotatably connected to a first position on the backrest rod, the lower part of the push rod is rotatably connected to a second position on the backrest rod, the first position is higher than the second position, and a limiting structure for limiting the push rod in the reverse working state is further arranged on the side connecting rod.

Further, along the left-right direction, the push rod is located in the back rest rod and the outer side of the side connecting rod, the limiting structure is a stop block protruding outwards from the outer side of the side connecting rod, and when the push rod is in the reverse working state, the push rod is supported on the stop block.

Preferably, the bottom bracket component comprises a front supporting rod and a rear supporting rod, wherein the front supporting rod extends obliquely backwards from bottom to top in the unfolded state, the rear supporting rod extends obliquely forwards from bottom to top, a front wheel component is arranged at the bottom of the front supporting rod, a rear wheel component is arranged at the bottom of the rear supporting rod, two of the upper part of the front supporting rod, the upper part of the rear supporting rod and the lower part of the side connecting rod are rotationally connected, and a third one of the two is rotationally connected, or the upper part of the front supporting rod, the upper part of the rear supporting rod and the lower part of the side connecting rod are rotationally connected around the same rotation center line; the rear stay bar is intersected with the rear support bar in the middle part and is rotationally connected at the intersection,

The bottom bracket assembly further comprises a linkage mechanism configured to link the front strut and the rear strut in a front-rear direction in a process of rotating and folding the rear strut relative to the rear strut.

Further, the upper portion of the front strut is rotatably connected with the upper portion of the rear strut about a first axis, the lower portion of the side link is rotatably connected with the upper portion of the rear strut about a second axis, the second axis is parallel to the first axis, the link mechanism includes a link lever extending in the front-rear direction, the front portion of the link lever is rotatably connected to the front strut, and the rear portion of the link lever is rotatably connected to the lower portion of the rear strut.

Preferably, the rear strut comprises an upper rod and a lower rod which slide and stretch along the up-down direction, the rear wheel assembly is arranged at the lower part of the lower rod, the upper part of the upper rod is rotationally connected with the upper part of the front strut and the lower part of the side connecting rod, the rear strut and the upper rod are mutually intersected and rotationally connected at an intersection, and a connecting rod is rotationally arranged between the lower part of the rear strut and the lower rod.

Preferably, the cross brace assembly comprises a plurality of cross bars extending in the left-right direction, the cross bars are respectively connected with different bars in the side brackets, one end of each cross bar is rotationally connected with the side bracket on one side around a first rotation center line, the other end of each cross bar is rotationally connected with the side bracket on the other side around a second rotation center line,

The folding state of the cart comprises a first folding state and a second folding state which is positioned behind the first folding state, the cart is in the first folding state, rods in the side brackets at each side are mutually folded, the side brackets at the two sides are respectively arranged at the left side and the right side of the cross rod, all the first rotation center lines extend in a collinear manner, all the second rotation center lines extend in a collinear manner, and the first rotation center lines and the second rotation center lines are mutually parallel; and when the trolley is in the second folded state, the two side brackets are overturned to the front sides or the rear sides of all the cross bars together.

Further, the cross bars are respectively arranged among the upper parts of the backrest rods, the upper parts of the push rods, the lower parts of the front support rods and the lower parts of the rear support rods on at least two sides, and/or the trolley is in the second folded state, and the front support rods, the rear support rods, the side connecting rods and the push rods are sequentially distributed from inside to outside.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: according to the trolley, in the unfolded state, the push rod has two different working states of forward and reverse, so that the bidirectional use function of the trolley is realized, the trolley can be folded, and the folded trolley occupies a small volume and is convenient to store and arrange.

Drawings

FIG. 1 is a schematic perspective view of a cart in an unfolded state according to an embodiment of the present utility model;

FIG. 2 is a schematic side view of FIG. 1;

FIG. 3 is a schematic side view of the cart in the folding process according to the present embodiment;

fig. 4 is a schematic perspective view of the cart in a first folded state according to the present embodiment;

FIG. 5 is a schematic side view of FIG. 4;

Fig. 6 is a schematic perspective view of the cart in the second folded state according to the present embodiment;

FIG. 7 is a schematic front view of FIG. 6;

fig. 8 is a schematic perspective view of the cart in the reverse working state of the push rod according to the present embodiment;

FIG. 9 is a schematic side view of FIG. 8;

Wherein: 1. a side bracket; 11. a bottom bracket assembly; 111. a front strut; 112. a rear strut; 112a, upper pole; 112b, lower rod; 12. a side link; 121. a stop block; 122. a sliding sleeve; 13. a rear stay; 131. a first pole segment; 132. a second pole segment; 14. a backrest rod; 15. a push rod; 151. a handle; 152. an upper push rod; 153. a push rod is downwards pushed; 16. a connecting rod; 17. a linkage rod; 18. a seat rod; 21. a cross bar; 3. a front wheel assembly; 31. a front wheel seat; 32. a front wheel body; 33. a front axle; 4. a rear wheel assembly; 41. a rear wheel seat; 42. a rear wheel body; 43. a rear axle; a1, a first shaft; a2, a second shaft; a3, a third shaft; a4, a fourth shaft; a5, a fifth shaft; a6, a sixth shaft; a7, a seventh axis; a8, an eighth shaft; a9, a ninth shaft; a10, a tenth axis; a11, an eleventh axis; x1, a first rotation center line; x2, a second rotation center line.

Detailed Description

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

Referring to fig. 1, a cart having an unfolded state and a folded state includes two sets of side frames 1 disposed on left and right sides, and a cross brace assembly disposed between the two sets of side frames 1, the side frames 1 of each side including a bottom frame assembly 11 capable of being folded in a front-rear direction, and side links 12, rear braces 13, backrest bars 14 and push rods 15 each extending in a top-bottom direction.

The upper part of the side link 12 and the upper part of the rear stay 13 are respectively and rotatably connected to the backrest rod 14, the lower part of the side link 12 and the lower part of the rear stay 13 are respectively and rotatably connected to the bottom bracket assembly 11, the lower part of the push rod 15 is rotatably connected to the lower part of the backrest rod 14 or rotatably connected to the upper part of the rear stay 13, the upper part of the push rod 15 is provided with a handle 151 for holding, and the handle 151 is positioned above the backrest rod 14. The trolley is in the deployed condition and the push rod 15 has a forward operating condition extending obliquely backward from bottom to top and a reverse operating condition extending obliquely forward from bottom to top.

In the process of converting the unfolding state and the folding state of the trolley, the push rod 15 is in a forward working state; when the trolley is in a folded state, the bottom bracket assembly 11 is folded in the front-rear direction, and the side connecting rods 12, the backrest rod 14 and the push rod 15 are folded behind the bottom bracket assembly 11.

Referring to the drawings, in this embodiment, the specific structure of the cart is as follows:

The bottom bracket assembly 11 comprises a front strut 111 and a rear strut 112, wherein the front strut 111 extends obliquely backwards from bottom to top, the rear strut 112 extends obliquely forwards from bottom to top in a unfolded state, the front strut 111 is provided with a front wheel assembly 3 at the bottom, and the rear strut 112 is provided with a rear wheel assembly 4 at the bottom. In this embodiment, the front wheel assembly 3 is a universal wheel, which includes a front wheel seat 31 and a front wheel body 32, wherein the front wheel seat 31 is rotatably connected to the bottom of the front strut 111 about a rotation axis (not shown) extending in the up-down direction, and the front wheel body 32 is rotatably connected to the front wheel seat 31 about a front wheel shaft 33 extending in the horizontal direction. The rear wheel assembly 4 is a directional wheel, and comprises a rear wheel seat 41, a rear wheel body 42 and a rear wheel shaft 43, wherein the rear wheel shaft 43 extends along the left-right direction, the rear wheel seat 41 is fixedly arranged at the bottom of the rear supporting rod 112, and the rear wheel body 42 is rotationally connected to the rear wheel seat 41 around the rear wheel shaft 43.

Two of the upper portion of the front strut 111, the upper portion of the rear strut 112 and the lower portion of the side link 12 are rotatably connected and a third is rotatably connected to one of the two, or the upper portion of the front strut 111, the upper portion of the rear strut 112 and the lower portion of the side link 12 are rotatably connected about the same rotation center line. In the present embodiment, the upper portion of the front strut 111 is rotatably connected to the upper portion of the rear strut 112 about the first axis A1, and the lower portion of the side link 12 is rotatably connected to the upper portion of the rear strut 112 about the second axis A2, the second axis A2 being parallel to the first axis A1.

In the present embodiment, the rear strut 112 includes an upper rod 112a and a lower rod 112b that slide and retract in the up-down direction, and a locking mechanism for locking the two, and the rear wheel assembly 4 is provided at the lower portion of the lower rod 112b, and the upper portion of the upper rod 112a is rotatably connected to the upper portion of the front strut 111 and the lower portion of the side link 12. Specifically, referring to fig. 1 and 2, the upper rod 112a is T-shaped and includes a rod body fixedly connected to the connecting portion, and in the unfolded state, the rod body extends obliquely forward from bottom to top, the connecting portion is fixedly connected to the front end portion of the upper rod 112a and extends obliquely backward from bottom to top, the lower portion of the connecting portion is rotatably connected to the upper portion of the front strut 111 about the first axis A1, the lower portion of the side link 12 is rotatably connected to the upper portion of the connecting portion about the second axis A2, the first axis A1 and the second axis A2 both extend in the left-right direction, and the second axis A2 is located above the first axis A1 in the up-down direction.

In this embodiment, the bottom bracket assembly 11 further includes a linkage mechanism configured to link the front strut 111 and the rear strut 112 in the front-rear direction during the process of rotating and folding the rear strut 13 relative to the rear strut 112.

The link mechanism includes a link 16 rotatably provided between the lower portion of the rear stay 13 and the lower rod 112b, the link 16 extending in the front-rear direction, the front portion of the link 16 being rotatably connected with the lower portion of the rear stay 13 about a third axis A3, the rear portion of the link 16 being rotatably connected with the rear wheel seat 41 about a fourth axis A4, the third axis A3 and the fourth axis A4 both extending in the left-right direction and in the up-down direction, the third axis A3 being located above the fourth axis A4.

Referring to fig. 1 and 2, the linkage mechanism further includes a linkage rod 17 extending in the front-rear direction, the front portion of the linkage rod 17 is rotatably connected to the front strut 111 about a fifth axis A5, the rear portion of the linkage rod 17 is rotatably connected to the lower portion of the rear strut 13 about a sixth axis A6, the fifth axis A5 and the sixth axis A6 both extend in the left-right direction and in the up-down direction, the sixth axis A6 is located above the fifth axis A5, and the sixth axis A6 is located above the third axis A3.

In the present embodiment, the rear stay 13 is located between the side links 12 on both sides and the bottom bracket assembly 11 on both sides in the left-right direction, and the rear stay 13 is intersected with the rear strut 112 at the middle and rotatably connected at the intersection, specifically, the rear stay 13 is rotatably connected with the upper rod 112a about the seventh axis A7. In this embodiment, the rear stay 13 includes a first rod segment 131 extending in the up-down direction, the middle portion of the first rod segment 131 is bent forward, the rear stay 13 further includes a second rod segment 132 extending forward from the bent portion of the first rod segment 131, the first rod segment 131 and the second rod segment 132 are integrally provided, and the rod main body and the middle portion of the first rod segment 131 are rotatably connected about a seventh axis A7. The lower portion of the first rod segment 131 is rotatably connected to the front end portion of the link 16 about the third axis A3, the front end portion of the second rod segment 132 is rotatably connected to the joint shaft 17 about the sixth axis A6, the seventh axis A7 also extends in the left-right direction, and the seventh axis A7 is located above the sixth axis A6 and the third axis A3 in the up-down direction.

The lower portion of the push rod 15 is rotatably connected to the lower portion of the backrest rod 14, specifically, the push rod 15 includes an upper push rod 152 and a lower push rod 153 that are slidably extendable and retractable in the longitudinal direction, the lower portion of the lower push rod 153, the lower portion of the backrest rod 14, and the upper portion of the rear stay 13 are rotatably connected together about an eighth axis A8, the eighth axis A8 extends in the left-right direction, and the handle 151 is provided at the upper portion of the upper push rod 152. In this embodiment, the lower part of the upper push rod 152 is inserted into the rod cavity of the lower push rod 153, a locking structure for locking the lower part of the lower push rod 153 and the lower part of the backrest rod 14 is arranged between the lower part of the lower push rod and the lower part of the backrest rod 14, and the locking structure is in a locking state in the process of switching the cart between the unfolded state and the folded state, so that the backrest rod 14 and the push rod 15 are mutually fixed.

Referring to fig. 1 and 2, the cart of the present embodiment is used for carrying a child, when the push rod 15 is in a forward working state, the handle 151 extends forward from the upper end of the push rod 152 and upward at the same time, and the caretaker holds the handle 151 and pushes forward to drive the cart forward, in this state, the child sitting on the cart is facing away from the caretaker, and the child faces the forward direction of the cart, so that the view is wide, and the caretaker can enjoy the scenery along the way.

When the push rod 15 is in the reverse working state, referring to fig. 8 and 9, the caretaker can push the cart to advance in the reverse direction, in this state, the child sitting on the cart faces the caretaker, and the caretaker can check the state of the child at any time, and meanwhile, the caretaker is always located in the field of view of the child, so that the caretaker has a safer sense.

In other embodiments, the cart can be used for transporting goods, and when the cart needs to be transported in the opposite direction, only the push rod 15 needs to be turned over to push the cart in the opposite direction, so that the operation that the conventional cart needs to be pushed and rotated by 180 degrees is avoided, and great convenience is provided for users.

In this embodiment, the upper portion of the side link 12 is rotatably connected to a first position on the back rest lever 14, and the lower portion of the push rod 15 is rotatably connected to a second position on the back rest lever 14, the first position being higher than the second position. Specifically, as shown in fig. 1 and 2, the upper portion of the side link 12 is rotatably connected to the backrest bar 14 about a ninth axis A9, and both the eighth axis A8 and the ninth axis A9 extend in the left-right direction, and in the unfolded state, the ninth axis A9 is located above the eighth axis A8 in the up-down direction.

In this embodiment, the side link 12 is further provided with a limiting structure for limiting the push rod 15 in the reverse operation state. Referring to fig. 1 and 2, in the left-right direction, the push rod 15 is located at the outer sides of the backrest rod 14 and the side link 12, and the limit structure is a stop block 121 protruding outwards from the outer side of the side link 12, and when the push rod 15 is in a reverse working state, the push rod 15 is supported on the stop block 121.

In other embodiments, an angle positioning structure is disposed at the rotational connection position between the push rod 15 and the backrest rod 14, and the angle positioning structure can adopt the structure existing in the prior art, which is not described herein, and the positioning mechanism can lock the push rod 15 when the push rod 15 and the backrest rod 14 are in different angles, so that the push rod 15 can be kept in a forward working state and a reverse working state. Through adjustment angle positioning mechanism for no matter under forward operating condition or under reverse operating condition, push rod 15 can lock under a plurality of different angles, and the user can be according to self height and use habit, adjusts push rod 15 to the most comfortable angle.

The side bracket 1 further comprises a seat bar 18 extending in the front-rear direction, the seat bar 18 being rotatably connected to the first bar segment 131, while the seat bar 18 is relatively slidably connected to the side link 12 with respect to the side link 12. In this embodiment, the sliding sleeve 122 is disposed in the middle of the side link 12, the sliding sleeve 122 is rotatably connected with the side link 12 around the tenth axis a10, the seat bar 18 is inserted into the sliding sleeve 122, the rear portion of the seat bar 18 is rotatably connected with the upper portion of the first bar segment 131 around the eleventh axis a11, the tenth axis a10 and the eleventh axis a11 all extend in the left-right direction, and in the unfolded state, the eighth axis A8 is located above the eleventh axis a11 along the length extending direction of the rear stay 13, and in the up-down direction, the tenth axis a10 is slightly higher than the eleventh axis a11, so that the child is more comfortable when riding on the stroller.

The cross brace assembly includes a plurality of cross bars 21 extending in the left-right direction, the plurality of cross bars 21 are respectively connected with different bars in the side brackets 1, one end of the cross bar 21 is rotationally connected with the side bracket 1 on one side around the first rotation center line X1, the other end of the cross bar 21 is rotationally connected with the side bracket 1 on the other side around the second rotation center line X2, in this embodiment, the cross bars 21 are respectively arranged between the middle part of the rear stay 13 on both sides, the upper part of the backrest rod 14, the upper part of the push rod 15, the lower part of the front support rod 111 and the lower part of the rear support rod 112.

In this embodiment, the lower part of the front strut 11 is provided with a first extension section extending backward, and the cross bar 21 is connected between the rear ends of the first extension sections on both sides; the rear part of the lower rod 112b of the rear supporting rod 112 is provided with a second extending section extending upwards, and the cross rod 21 is connected between the upper ends of the second extending sections at the two sides; the cross bar 21 disposed between the middle portions of the rear stay 13 on both sides is located above the seventh axis A7 in the up-down direction.

The trolley is in a unfolding state, the side brackets 1 on two sides are unfolded relatively, the front support rod 111 and the rear support rod 112 are unfolded relatively along the front-rear direction, the front wheel assembly 3 and the rear wheel assembly 4 are supported on the ground in a front-rear mode, a riding space is formed between the seat rod 18 and the backrest rod 14, a child can sit in the riding space, a carer can convert the working state of the push rod 15 according to requirements, and the push rod 15 is pushed to drive the trolley to advance.

In this embodiment, the folded state of the cart includes a first folded state and a second folded state located after the first folded state. When the cart is converted from the unfolded state to the first folded state, referring to fig. 3, the upper push rod 152 and the lower push rod 153 are folded together along the length direction, meanwhile, the locking between the upper rod 112a and the lower rod 112b is released, the push rod 15 is converted to the forward working state and the push rod 15 is pressed down, the push rod 15 drives the backrest rod 14 to move downwards together, the backrest rod 14 drives the rear support rod 13 and the side connecting rod 12 to turn backwards and fold towards the rear of the rear support rod 112, and the front support rod 111 and the rear support rod 112 are driven by the linkage mechanism to fold along the front and rear directions; during the backward overturning of the rear stay 13, the rear stay 13 drives the seat bar 18 to move backward and simultaneously downward, and the sliding sleeve 122 slides forward relative to the seat bar 13 along the length extension direction of the seat bar 13.

Referring to fig. 4 and 5, in the cart in the first folded state, the rods in the side brackets 1 are folded with each other, and the side brackets 1 on both sides are respectively disposed on the left and right sides of the cross bar 21, wherein the front strut 111, the rear strut 112, the side link 12, and the push rod 15 are folded sequentially from front to back, the rear strut 13 and the seat rod 18 are folded between the rear strut 112 on both sides and the side link 12 on both sides, and the backrest rod 14 is disposed between the push rods 15 on both sides; the handle 151 is closed up on the upper part of the backrest bar 14 in the up-down direction, and the handle 151 is positioned above the connecting part of the rear strut 112; the front wheel assembly 3 is located above the rear wheel assembly 4 and is folded between the rear struts 112 on both sides. In this state, the rotational connection of the rear wheel assembly 4 and the backrest rod 14 with the rear stay 13 is supported on the ground in common, and at the same time, all the first rotational center lines X1 extend in line, all the second rotational center lines X2 extend in line, and the first rotational center lines X1 and the second rotational center lines X2 are parallel to each other. The cart in the first folded state is compact in structure, neat in shape and approximately in a cuboid shape.

The side brackets 1 on both sides are turned inward around the first and second rotation center lines X1 and X2 so that the side brackets 1 are turned over to the front or rear sides of all the cross bars 21 together, and the cart in the first folded state can be converted into the second folded state. In the second folded state, as shown in fig. 6 and 7, the front strut 111, the rear strut 112, the side link 12 and the push rod 15 are sequentially distributed from inside to outside along the left-right direction; the front wheel axle 33 and the rear wheel axle 43 are converted to extend in the front-rear direction, and the front wheel assembly 3 is folded between the side brackets 1 and the cross brace assembly in the front-rear direction. The cart in the second folded state is further reduced in size and is more neat in shape.

To sum up, the handcart of this embodiment has the function of two-way use, just can realize the switching-over of shallow through upset push rod 15, and this handcart has two kinds of folding state, and the folding principle of shallow is simple, just can realize the conversion to first folding state through pushing down push rod 15, later inwards overturn the side stand 1 of both sides alright realize the conversion to the second folding state, and the shallow after folding occupies the small, and compact structure, portable and accomodate.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. A cart having an expanded state and a collapsed state, characterized by: the cart comprises two groups of side brackets arranged on the left side and the right side, and a cross brace assembly arranged between the two groups of side brackets, wherein each side bracket comprises a bottom bracket assembly which can be folded along the front-back direction, a side connecting rod, a rear brace rod, a backrest rod and a push rod which extend along the up-down direction respectively,

Wherein the upper part of the side connecting rod and the upper part of the rear supporting rod are respectively and rotatably connected to the backrest rod, the lower part of the side connecting rod and the lower part of the rear supporting rod are respectively and rotatably connected to the bottom bracket assembly, and the lower part of the push rod is rotatably connected to the lower part of the backrest rod or rotatably connected to the upper part of the rear supporting rod; the push rod is in a forward working state of obliquely extending from bottom to top and a reverse working state of obliquely extending from bottom to top and forwards in a unfolding state,

The push rod is in the forward working state in the process of converting the unfolding state and the folding state of the trolley; the trolley is in a folded state, the bottom bracket assembly is folded in the front-back direction, and the side connecting rods, the backrest rods and the push rods are folded behind the bottom bracket assembly.

2. The cart of claim 1, wherein: the lower part of the push rod is rotationally connected with the lower part of the backrest rod, and the backrest rod and the push rod are mutually fixed in the process of switching the trolley between the unfolding state and the folding state.

3. The cart of claim 2, wherein: the push rod comprises a lower push rod and an upper push rod, the lower push rod and the upper push rod can slide and stretch along the length direction, the lower part of the lower push rod is rotationally connected with the lower part of the backrest rod, a handle capable of being held is arranged on the upper part of the upper push rod, when the trolley is in the unfolding state, the handle is positioned above the backrest rod, and when the trolley is in the folding state, the handle is close to the upper part of the backrest rod.

4. The cart of claim 2, wherein: the upper portion of the side connecting rod is rotatably connected to a first position on the backrest rod, the lower portion of the push rod is rotatably connected to a second position on the backrest rod, the first position is higher than the second position, and a limiting structure for limiting the push rod in the reverse working state is further arranged on the side connecting rod.

5. The cart of claim 4, wherein: along left and right directions, the push rod is located the back pole with the outside of side connecting rod, limit structure is the follow the outside portion of side connecting rod outwards protrusion extension's dog, when the push rod is in under the reverse operating condition, the push rod support in on the dog.

6. The cart of any one of claims 1 to 5, wherein: the bottom bracket component comprises a front supporting rod and a rear supporting rod, wherein the front supporting rod extends obliquely backwards from bottom to top in an unfolding state of the trolley, the rear supporting rod extends obliquely forwards from bottom to top, a front wheel component is arranged at the bottom of the front supporting rod, a rear wheel component is arranged at the bottom of the rear supporting rod, two of the upper part of the front supporting rod, the upper part of the rear supporting rod and the lower part of the side connecting rod are rotationally connected, a third party is rotationally connected to one of the two, or the upper part of the front supporting rod, the upper part of the rear supporting rod and the lower part of the side connecting rod are rotationally connected around the same rotation center line; the rear stay bar is intersected with the rear support bar in the middle part and is rotationally connected at the intersection,

The bottom bracket assembly further comprises a linkage mechanism configured to link the front strut and the rear strut in a front-rear direction in a process of rotating and folding the rear strut relative to the rear strut.

7. The cart of claim 6, wherein: the upper portion of front branch with the upper portion of back branch is rotationally connected around first axle, the lower part of side link with the upper portion of back branch is rotationally connected around the second axle, the second axle with first axle is parallel to each other, the link gear includes the gangbar that extends along fore-and-aft direction, the front portion of gangbar rotationally in on the front branch, the rear portion of gangbar rotationally connect in the lower part of back vaulting pole.

8. The cart of claim 6, wherein: the rear supporting rod comprises an upper rod and a lower rod which slide and stretch along the up-down direction, the rear wheel assembly is arranged at the lower part of the lower rod, the upper part of the upper rod is rotationally connected with the upper part of the front supporting rod and the lower part of the side connecting rod, the rear supporting rod is mutually crossed with the upper rod and rotationally connected at the crossing part, and a connecting rod is rotationally arranged between the lower part of the rear supporting rod and the lower rod.

9. The cart of claim 6, wherein: the cross brace component comprises a plurality of cross bars extending along the left-right direction, the cross bars are respectively connected with different rod pieces in the side brackets, one end part of the cross bar is rotationally connected with one side bracket around a first rotation center line, the other end part of the cross bar is rotationally connected with the other side bracket around a second rotation center line,

The folding state of the cart comprises a first folding state and a second folding state which is positioned behind the first folding state, the cart is in the first folding state, rods in the side brackets at each side are mutually folded, the side brackets at the two sides are respectively arranged at the left side and the right side of the cross rod, all the first rotation center lines extend in a collinear manner, all the second rotation center lines extend in a collinear manner, and the first rotation center lines and the second rotation center lines are mutually parallel; and when the trolley is in the second folded state, the two side brackets are overturned to the front sides or the rear sides of all the cross bars together.

10. The cart of claim 9, wherein: the upper parts of the backrest rods, the upper parts of the push rods, the lower parts of the front support rods and the lower parts of the rear support rods are respectively provided with the cross rods, and/or the trolley is in the second folded state, and the front support rods, the rear support rods, the side connecting rods and the push rods are sequentially distributed from inside to outside.