CN221477239U - Cart - Google Patents

Abstract

The utility model discloses a cart, comprising: a chassis; a front wheel bracket, the rear part of which is rotatably connected to the front part of the chassis; a rear wheel bracket slidably provided at a rear portion of the chassis in a longitudinal extending direction of the chassis; the lower part of the upper bracket is rotationally connected with the front part of the underframe; and the linkage mechanism is configured to enable the front wheel bracket to turn backwards and fold below the underframe and enable the rear wheel bracket to slide forwards along the underframe in the process that the upper bracket is folded downwards relative to the underframe. When the cart is folded, the upper bracket can be linked to enable the front wheel bracket to turn backwards in the process of rotating and folding relative to the underframe, and the rear wheel bracket moves forwards along the underframe, so that the front wheel assembly and the rear wheel assembly are folded along the front-rear direction, and the folded size of the cart is reduced.

Description

Cart

Technical Field

The utility model relates to a cart.

Background technique

The stroller in the prior art includes a frame with an unfolded state and a folded state, a seat arranged on the frame, and a locking mechanism for locking the frame in the unfolded state. There are many types of strollers on the market, with various structures, and different shapes and sizes after folding. For some usage scenarios, such as when carrying a stroller into an aircraft cabin, there are rigid requirements for the overall size of the folded stroller. Therefore, how to make the stroller as compact and as small as possible after folding while ensuring the basic bearing function of the stroller has always been a goal pursued by those skilled in the art.

Summary of the invention

The utility model aims to provide a new cart.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a cart having an unfolded state and a folded state. In the unfolded state, the cart comprises:

A chassis, the chassis extending in a front-to-rear direction;

A front wheel bracket, the front wheel bracket extending in the front-to-back direction, a front wheel assembly being arranged at the front portion of the front wheel bracket, and a rear portion of the front wheel bracket being rotatably connected to the front portion of the chassis;

A rear wheel bracket, on which a rear wheel assembly is arranged, and the rear wheel bracket is slidably arranged at the rear of the base frame along the length extension direction of the base frame;

An upper bracket, the upper bracket extending in the up-down direction, the lower portion of the upper bracket being rotatably connected to the front portion of the base frame;

The linkage mechanism is configured to cause the front wheel bracket to flip backward and be retracted under the bottom frame, and cause the rear wheel bracket to slide forward along the bottom frame during the process of the upper bracket being retracted downward relative to the bottom frame.

Preferably, the linkage mechanism includes at least a support frame extending in the up-down direction, the support frame and the base frame intersect each other and are rotatably connected at the intersection, the upper part of the support frame is connected to the upper bracket, and during the conversion of the cart from the unfolded state to the folded state, the lower part of the support frame moves forward, so that the front wheel bracket and the rear wheel bracket are linked.

Furthermore, the linkage mechanism further comprises:

A swing frame, one end of which is rotatably connected to the rear portion of the front wheel bracket, and the other end of which is rotatably connected to the lower portion of the support frame;

A connecting frame extends along the front-to-back direction, a front portion of the connecting frame is rotatably connected to a lower portion of the supporting frame, and a rear portion of the connecting frame is rotatably connected to the rear wheel bracket.

In some embodiments, the base frame and the front wheel bracket are rotatably connected around a first center line, and the front wheel bracket and the swing frame are rotatably connected around a second center line, and when the cart is in an unfolded state, the first center line is located in front of the second center line; when the cart is in a folded state, the second center line is located in front of the first center line.

In some embodiments, the center line of the rotational connection between the lower portion of the upper bracket and the front portion of the base frame extends parallel to or colinearly with the first center line, and when the cart is in the unfolded state, the upper bracket extends tilted backward from bottom to top, and the support frame is located behind the upper bracket.

In some embodiments, the cart further includes a surrounding frame, which extends in the front-to-back direction when the cart is in the unfolded state, and is located above the base frame, wherein the front portion of the surrounding frame is rotatably connected to the rear portion of the front wheel bracket, and the surrounding frame is capable of relative sliding along its own length direction and is capable of relative rotationally connecting to the support frame.

In some embodiments, a sliding member is rotatably connected to the support frame, and the sliding member can be connected to the surrounding frame by relative sliding along the length extension direction of the surrounding frame. Along the length extension direction of the support frame, the sliding member is located above the connection position between the support frame and the base frame, and is located below the connection position between the support frame and the upper bracket.

In some embodiments, the front portion of the surrounding frame is rotatably connected to the rear portion of the front wheel bracket and one end portion of the swing frame around the same rotation center line.

In some embodiments, when the cart is in the unfolded state, the front wheel bracket and the surrounding frame extend along the same length direction from front to rear and tilt upward.

Preferably, the upper portion of the support frame is connected to the upper frame so as to be both relatively rotatable and slidable along the length extension direction of the upper frame. During the conversion of the cart from the unfolded state to the folded state, the upper portion of the support frame slides downward along the upper frame and rotates relatively with the upper frame to be folded.

In some embodiments, the upper portion of the support frame is rotatably connected to a sliding seat, and the sliding seat can be slidably disposed on the upper bracket along the length extension direction of the upper bracket; the cart also includes a foldable seat device, and the seat device is disposed on the sliding seat and can be rotatably disposed relative to the sliding seat. When the cart is in a folded state, the seat device and the upper bracket are folded together and folded above the base frame.

In some embodiments, the front wheel assembly and the rear wheel assembly each have two groups arranged on the left and right sides. When the cart is in a folded state, the front wheel bracket is retracted under the base frame, and the front wheel assembly and the rear wheel assembly on the same side are close to each other in the front-to-back direction, and the base frame is not higher than the front wheel assembly and the rear wheel assembly in the height direction.

Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art: when the cart provided by the embodiment of the utility model is folded, the upper bracket can drive the support frame to rotate relative to the bottom frame during the process of rotating and retracting relative to the bottom frame, thereby linking the front wheel bracket to flip backward and the rear wheel bracket to move forward along the bottom frame, so that the front wheel assembly and the rear wheel assembly are retracted in the front-to-back direction, reducing the size of the cart after folding, bringing convenience to the user's daily travel.

Furthermore, in the stroller, when a seat device is installed, the arrangement of the seat device will not increase the volume of the stroller after it is folded, so that the user can install the seat device on the stroller and fold it together without the need to store it separately.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the overall structure of a cart in an unfolded state according to an embodiment of the utility model;

Figure 2 is a schematic diagram of the cart of Figure 1 with the rotation center line marked;

FIG3 is a schematic diagram of the three-dimensional structure of the cart of FIG1 with the seat device removed;

Figure 4 is a schematic side view of the cart of Figure 1;

Figure 5 is a side view structural schematic diagram 1 of the cart of Figure 4 during folding;

Figure 6 is a second side structural schematic diagram of the cart of Figure 4 during folding;

Figure 7 is a third side structural schematic diagram of the cart of Figure 4 during folding;

Figure 8 is a fourth side structural schematic diagram of the cart of Figure 4 during folding;

Figure 9 is a schematic diagram of the three-dimensional structure of the cart of Figure 8;

Figure 10 is a side view of the structure of the cart in Figure 4 after being converted to a folded state;

Among them: 1. bottom frame; 11. bottom bar;

2. Front wheel bracket; 21. Front cross bar; 22. Front connecting rod;

3. Rear wheel bracket; 31. Rear cross bar; 32. Rear connecting rod;

4. Upper bracket; 41. Upper support rod;

5. Support frame; 51. Support rod; 52. Support cross bar;

6. Swing frame; 61. Swing rod;

7. Connecting frame; 71. Connecting rod;

8. surrounding frame; 80. sliding member;

9. Sliding seat; 10. Push rod frame; 101. Push rod; 102. Push handle;

20. Front wheel assembly; 30. Rear wheel assembly;

40. Seating device; 401. Seat; 402. Backrest; 403. Mounting seat.

Detailed ways

The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

The following descriptions of the front, rear, left, right, top, and bottom directions are all defined with reference to the directions observed by the user when the stroller is in the unfolded state, and are intended only to clearly illustrate the relative positional relationship of the various rods/components in the stroller.

Referring to the cart shown in Figures 1 to 10, it has an unfolded state and a folded state, and the cart includes a base frame 1, a front wheel bracket 2, a rear wheel bracket 3, and an upper bracket 4, wherein when the cart is in the unfolded state, the base frame 1 extends in the front-to-back direction; the front wheel bracket 2 also extends in the front-to-back direction, and a front wheel assembly 20 is provided at the front portion of the front wheel bracket 2, and the rear portion of the front wheel bracket 2 is rotatably connected to the front portion of the base frame 1; a rear wheel assembly 30 is provided on the rear wheel bracket 3, and the rear wheel bracket 3 can be slidably provided at the rear portion of the base frame 1 along the length extension direction of the base frame 1; the upper bracket 4 extends in the up-down direction, and the lower portion of the upper bracket 4 is rotatably connected to the front portion of the base frame 1.

The stroller further includes a linkage mechanism, which is configured to cause the front wheel bracket 2 to flip backward and be folded under the bottom frame 1, and cause the rear wheel bracket 3 to slide forward along the bottom frame 1, when the upper bracket 4 is rotated and folded downward relative to the bottom frame 1. In this way, when the stroller is folded, the front wheel assembly 20 can be flipped backward and the rear wheel assembly 30 can be moved forward, so that the size of the stroller after folding is greatly reduced.

Specifically, the linkage mechanism includes at least a support frame 5 extending in the up-down direction, the support frame 5 and the base frame 1 intersect with each other and are rotatably connected at the intersection, and the upper part of the support frame 5 is connected with the upper bracket 4, so that during the process of the upper bracket 4 rotating and retracting relative to the base frame 1, the support frame 5 can be driven to rotate relative to the base frame 1, thereby causing the lower part of the support frame 5 to move forward, and the front wheel bracket 2 and the rear wheel bracket 3 are linked to move relative to the base frame 1.

In the cart, the upper portion of the support frame 5 is rotatably connected at least relative to the upper frame 4, so that when the upper frame 4 is rotated and retracted relative to the bottom frame 1, the support frame 5 can rotate relative to the upper frame 4 and retract with the upper frame 4 and the bottom frame 1. In this embodiment, the upper portion of the support frame 5 can be relatively rotated and can be slidably arranged on the upper frame 4 along the length extension direction of the upper frame 4. Specifically, the upper portion of the support frame 5 is rotatably provided with a sliding seat 9, and the sliding seat 9 can be slidably arranged on the upper frame 4 along the length extension direction of the upper frame 4. When the cart is converted from the unfolded state to the folded state, the sliding seat 9 slides downward along the upper frame 4.

In this embodiment, the linkage mechanism further includes a swing frame 6 and a connecting frame 7, wherein one end of the swing frame 6 is rotatably connected to the rear of the front wheel bracket 2, and the other end of the swing frame 6 is rotatably connected to the lower part of the support frame 5; the connecting frame 7 extends in the front-to-back direction, the front part of the connecting frame 7 is rotatably connected to the lower part of the support frame 5, and the rear part of the connecting frame 7 is rotatably connected to the rear wheel bracket 3. In this way, during the folding process of the cart, when the support frame 5 rotates relative to the base frame 1 so that the lower part of the support frame 5 moves forward, the swing frame 6 swings and pushes the rear part of the front wheel bracket 2 to move upward, so that the front part of the front wheel bracket 2 turns downward and backward, thereby causing the front wheel assembly 20 to gradually move backward; when the lower part of the support frame 5 moves forward, the connecting frame 7 moves forward and rotates and retracts relative to the base frame 1, and drives the rear wheel bracket 3 to move forward along the base frame 1, so that the rear wheel assembly 30 retracts forward.

As shown in the drawings, the cart of this embodiment further includes a surrounding frame 8. When the cart is in the unfolded state, the surrounding frame 8 extends in the front-to-back direction and is located above the base frame 1. The front portion of the surrounding frame 8 is rotatably connected to the front wheel bracket 2. The surrounding frame 8 can slide relatively along its own length direction and can be relatively rotatably connected to the support frame 5. Here, a sliding member 80 is rotatably connected to the support frame 5. The sliding member 80 can be relatively slidably connected to the surrounding frame 8 along the length extension direction of the surrounding frame 8. Along the length extension direction of the support frame 5, the sliding member 80 is located above the connection position between the support frame 5 and the base frame 1, and is located below the connection position between the support frame 5 and the upper bracket 4. In the process of the support frame 5 rotating and retracting relative to the base frame 1, the sliding member 80 slides forward along the surrounding frame 8 and rotates relative to the support frame 5, so that the surrounding frame 8, the support frame 5 and the base frame 1 are retracted relative to each other.

Referring to FIG. 1 to FIG. 4 , in this embodiment, the components in the cart are specifically arranged in the following manner:

The bottom frame 1 includes two bottom bars 11 disposed on the left and right sides and extending in the front-to-back direction. When the pushcart is in the unfolded state, the bottom bars 11 extend obliquely from the back to the front and upward, that is, the front part of the bottom bar 11 is higher than the rear part thereof;

The front wheel bracket 2 includes a front cross bar 21 located at the front, and two front connecting rods 22 respectively arranged at the left and right ends of the front cross bar 21 and extending backward from the front cross bar 21. The front cross bar 21 is a U-shaped rod with an opening facing forward, and a front wheel assembly 20 is respectively arranged at both ends of the front part thereof. The two front connecting rods 22 are located between the two bottom rods 11 along the left-right direction, and the front connecting rod 22 on each side is rotatably connected to the front part of the bottom rod 11 on the same side around the first center line X1;

The rear wheel bracket 3 includes a rear cross bar 31 extending in the left-right direction, and two rear connecting rods 32 respectively arranged at the left and right ends of the rear cross bar 31 and extending forward from the rear cross bar 31. A rear wheel assembly 30 is respectively arranged at the left and right ends of the rear cross bar 31. The rear connecting rod 32 on each side can be slidably arranged on the bottom bar 11 on the same side along the length extension direction of the bottom bar 11. Here, the rear connecting rod 32 is set as a sliding sleeve rod, which is slidably sleeved on the bottom bar 11 on the same side.

The upper bracket 4 includes two upper support rods 41 disposed on the left and right sides, and the upper support rod 41 on each side is rotatably connected to the front part of the bottom rod 11 on the same side. The rotation center line between the upper support rod 41 and the bottom rod 11 and the first center line X1 can be arranged parallel to each other, or can be arranged to extend colinearly as in the present embodiment;

The support frame 5 is located between the two upper support rods 41 and between the two bottom rods 11 along the left-right direction. The support frame 5 includes two support rods 51 respectively arranged on the left and right sides and extending in the up-down direction, and a cross bar 52 fixed between the two support rods 51. On each side, the support rods 51 and the bottom rods 11 on the same side intersect with each other and are rotatably connected around the rotation center line X0 at the intersection. The upper part of the support rod 51 is rotatably connected to the sliding seat 9, which is specifically a sliding sleeve, which is slidably sleeved on the upper support rod 41 on the same side.

The swing frame 6 includes two swing rods 61 disposed on the left and right sides. When the cart is in the unfolded state, the swing rod 61 is approximately in the shape of a letter "7" and extends roughly in the up-down direction. Here, the upper part of the swing rod 61 is rotatably connected to the rear part of the front link 22 on the same side around the second center line X2, and the second center line X2 is located behind the first center line X1; the lower part of the swing rod 61 is rotatably connected to the lower part of the support rod 51 on the same side around the third center line X3, and along the length extension direction of the support rod 51, the third center line X3 is located below the rotation center line X0;

The connecting frame 7 includes two connecting rods 71 which are respectively arranged on the left and right sides and extend in the front-to-back direction. The front portion of the connecting rod 71 is rotatably connected to the lower portion of the support rod 51 on the same side around a fourth center line X4. Along the length extension direction of the support rod 51, the fourth center line X4 is located below the rotation center line X0, and here the fourth center line X4 is also located below the third center line X3; the rear portion of the connecting rod 71 is rotatably connected to the rear connecting rod 32 on the same side. When the cart is in the unfolded state, the connecting rod 71 as a whole is located below the base frame 1.

The surrounding frame 8 is a U-shaped rod with an opening facing forward, and the front parts of the side rods on the left and right sides are rotatably connected to the front support rod 22 on the same side. Specifically, the front parts of the side rods of the surrounding frame 8, the upper part of the swing rod 61 and the rear part of the front support rod 22 are rotatably connected together around the second center line X2; the middle part of the support rod 51 on each side is rotatably connected with a sliding member 80, which is also in the shape of a sliding sleeve and is slidably mounted on the side rod on the corresponding side of the surrounding frame 8. When the cart is in the unfolded state, the surrounding frame 8 is arranged above the bottom frame 1 at a distance, so that a storage space for accommodating items can be formed between the bottom frame 1 and the surrounding frame 8. By arranging components such as a cloth cover on the surrounding frame 8, a storage basket can be formed.

The push cart further includes a push rod frame 10, the lower portion of which is rotatably connected to the upper portion of the upper bracket 4, so that the push rod frame 10 can be rotatably folded relative to the upper bracket 4 when the push cart is folded. The push rod frame 10 itself can also be telescopically arranged along the length direction, so that the length of the push rod frame 10 is adjustable. Specifically, the push rod frame 10 includes two push rods 101 arranged on the left and right sides and extending in the up-down direction, and a push handle 102. The push handle 102 is a U-shaped rod with an opening facing downward, and the side rods on both sides thereof are slidably telescopically connected to the push rod 101 on the same side.

As shown in the drawings, the stroller further comprises a seat device 40, which is foldable and arranged on the sliding seat 9 and can be rotatably arranged relative to the sliding seat 9. When the stroller is folded, the seat device 40 folds itself and rotates relative to the sliding seat 9 to fold with the upper bracket 4, and is folded together with the upper bracket 4 and the bottom frame 1. Specifically, the seat device 40 comprises a rotatably connected seat 401, a backrest 402 and a mounting seat 403, the mounting seat 403 is fixedly arranged on the sliding seat 9, and is specifically arranged integrally or detachably arranged on the sliding seat 9, and a seat locking mechanism is arranged at the rotational connection between the seat 401, the backrest 402 and the mounting seat 403 to lock the seat device 40 in an open state for sitting and standing, and the seat 401 and the backrest 402 can be rotated and folded relative to the upper bracket 4 after unlocking.

The stroller of this embodiment is in the unfolded state, as shown in Figures 1 to 4, the bottom frame 1 extends downwardly from front to rear; the upper bracket 4 and the push rod frame 10 extend backwardly from bottom to top along the same length direction, the front cross bar 21 of the front wheel bracket 2 extends in front of the upper bracket 4 and the bottom frame 1, the front connecting rod 22 of the front wheel bracket 2 and the surrounding frame 8 extend upwardly from front to rear along the same length direction, the support frame 5 is located at the rear side of the upper bracket 4 and supported between the upper bracket 4 and the bottom frame 1 in the up-down direction, and the rear wheel bracket 3 is located at the rear of the bottom frame 1. The seat device 40 is located on the sliding seat 9 and is located at the upper part of the upper bracket 4.

When the stroller needs to be folded, as shown in FIG5 , the seat 401 and the backrest 402 of the seat device 40 are first rotated relative to each other so that the seat device 40 itself is folded and folded relative to the upper bracket 4; then, as shown in FIG6 , the push rod frame 10 is driven to shrink its length in the up-down direction, and the push rod frame 10 is driven to flip and fold relative to the upper bracket 4, and then, the upper bracket 4 and the push rod frame 10 are driven to move backward and downward as a whole, so that they are rotated relative to the base frame 1, as shown in FIGS. 7 to 9 , at this time, the support frame 5 rotates relative to the base frame 1 around the rotation center line X0, and the sliding seat 9 slides upward along the upper bracket 4, so that The seat device 40 moves upward along the upper bracket 4 as a whole; the lower part of the support frame 5 moves forward, which, on the one hand, drives the swing frame 6 to drive the front wheel bracket 2 to flip around the first center line X1, so that the front wheel assembly 20 moves backward toward the bottom of the base frame 1, and on the other hand, drives the connecting frame 7 to drive the rear wheel bracket 3 to slide forward along the base frame 1, so that the rear wheel assembly 30 moves forward. At the same time, it also makes the surrounding frame 8 slide along the sliding member 80 and rotate relative to the front wheel bracket 2, so that the upper bracket 4, the support frame 5, the surrounding frame 8 and the base frame 1 are gradually retracted in the up and down directions, and the front wheel assembly 20 and the rear wheel assembly 30 both move toward the middle.

The folded stroller is shown in Figure 10, the rear part of the front wheel bracket 2 is flipped to the front and upper part of the base frame 1, the second center line X2 is located in front of the first center line X1, the seat 401 and the backrest 402 of the seat device 40 overlap with the upper bracket 4 as much as possible in the length direction, and the front wheel assembly 20 and the rear wheel assembly 30 on the same side are close to each other in the front and rear direction, so that the length of the folded stroller is reduced as much as possible; the base frame 1 is not higher than the front wheel assembly 20 and the rear wheel assembly 30 in the height direction, and the folded upper bracket 4 and the seat device 40 partially overlap with the front wheel assembly 20 and the rear wheel assembly 30 in the height direction, so that the height dimension after folding is also reduced.

With the structure of this stroller, the stroller not only provides stable support and meets national standards, and when the seat device 40 is installed, the size of the stroller after folding can reach within 500mm×440mm×200mm, and the sum of the three sides of the folded stroller is no more than 1150mm, which can meet the requirements of being carried on an airplane after being folded, bringing convenience to the user's daily travel.

The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims (10)

1. A cart having an expanded state and a collapsed state, wherein in the expanded state the cart comprises:

a chassis extending in a front-rear direction;

A front wheel bracket extending in a front-rear direction, a front wheel assembly being provided at a front portion of the front wheel bracket, a rear portion of the front wheel bracket being rotatably connected to a front portion of the chassis;

The rear wheel support is provided with a rear wheel assembly and is slidably arranged at the rear part of the underframe along the length extension direction of the underframe;

the upper bracket extends along the up-down direction, and the lower part of the upper bracket is rotationally connected with the front part of the underframe;

And the linkage mechanism is configured to enable the front wheel bracket to turn backwards and fold below the underframe and enable the rear wheel bracket to slide forwards along the underframe in the process that the upper bracket is folded downwards relative to the underframe.

2. The cart of claim 1, wherein: the linkage mechanism at least comprises a supporting frame extending along the up-down direction, the supporting frame is mutually intersected with the underframe and is rotationally connected at the intersection, the upper portion of the supporting frame is connected with the upper bracket, and the lower portion of the supporting frame moves forwards in the process of converting an unfolding state into a folding state of the cart, so that the front wheel bracket and the rear wheel bracket are linked.

3. The cart of claim 2, wherein: the linkage mechanism further includes:

The other end part of the swinging frame is rotationally connected to the lower part of the supporting frame;

The connecting frame extends along the front-back direction, the front part of the connecting frame is rotationally connected with the lower part of the supporting frame, and the rear part of the connecting frame is rotationally connected to the rear wheel bracket.

4. A cart according to claim 3, wherein: the chassis is rotationally connected with the front wheel bracket around a first central line, the front wheel bracket is rotationally connected with the swing frame around a second central line, and the first central line is positioned in front of the second central line when the trolley is in an unfolding state; the cart is in a folded state, and the second center line is positioned in front of the first center line.

5. The cart of claim 4, wherein: the central line of the rotary connection between the lower part of the upper bracket and the front part of the underframe extends parallel or collinear with the first central line, the upper bracket extends obliquely backwards from bottom to top when the trolley is in a unfolded state, and the support frame is positioned behind the upper bracket.

6. A cart according to claim 3, wherein: the cart further comprises a surrounding frame, the cart is in a unfolded state, the surrounding frame extends along the front-rear direction, the surrounding frame is located above the underframe, the front portion of the surrounding frame is rotationally connected to the rear portion of the front wheel support, and the surrounding frame can relatively slide along the length direction of the cart and relatively rotationally connected with the support frame.

7. The cart of claim 6, wherein: the sliding piece is rotationally connected to the supporting frame, can relatively slide along the length extension direction of the surrounding frame and is connected with the surrounding frame, and is positioned above the connection position between the supporting frame and the underframe and below the connection position between the supporting frame and the upper bracket along the length extension direction of the supporting frame;

And/or the front part of the surrounding frame is rotationally connected with the rear part of the front wheel bracket and one end part of the swinging frame around the same rotation center line;

And/or when the trolley is in the unfolded state, the front wheel bracket and the surrounding frame extend obliquely from front to back and upwards along the same length direction.

8. The cart of any of claims 2-7, wherein: the upper part of the support frame can rotate relatively and can slide along the length extending direction of the upper support frame to be connected with the upper support frame, and the upper part of the support frame slides downwards along the upper support frame and rotates relatively with the upper support frame to be folded in the process of converting the unfolded state of the cart into the folded state of the cart.

9. The cart of claim 8, wherein: the upper part of the support frame is rotationally connected with a sliding seat, and the sliding seat can be slidably arranged on the upper support frame along the length extension direction of the upper support frame; the trolley further comprises a foldable seat device, wherein the seat device is arranged on the sliding seat and can be rotatably arranged relative to the sliding seat, and in a folded state, the seat device and the upper bracket are mutually folded and folded above the underframe.

10. The cart of claim 1, wherein: when the cart is in a folded state, the front wheel support is folded below the bottom frame, the front wheel assembly and the rear wheel assembly on the same side are mutually close along the front-rear direction, and the bottom frame is not higher than the front wheel assembly and the rear wheel assembly along the height direction.