Cart

Abstract

The invention relates to a cart which comprises a front support, a rear support, a push rod frame, a connecting frame, a front wheel assembly and a rear wheel assembly, when the cart is in an unfolded state, the upper portion of the rear support is rotationally connected to the front support, and the lower portion of the push rod frame is rotationally connected to the rear support; the front portion of the connecting frame is rotationally connected with the upper portion of the front support, the rear portion of the connecting frame is rotationally connected to the push rod frame, the front wheel assembly is arranged at the bottom of the front support, the rear wheel assembly is arranged at the bottom of the rear support, and the stroller is folded when the stroller is in a folded state. The front support, the rear support, the push rod frame and the connecting frame extend in the up-down direction and are folded in the front-back direction. The number of rod pieces of the stroller is small, the structure is simple, folding operation is convenient, the size of the folded stroller is relatively small, the structure of the folded stroller is relatively flat, and great convenience is brought to daily carrying, storage and the like of a user.

Description

Technical Field

[0001] The invention relates to the field of children's products, and in particular to a stroller. Background Art

[0002] In the prior art, there are various structures of baby strollers, and the stroller frame generally includes a front bracket, a rear bracket and a push rod frame that are rotatably connected to each other, and a connecting rod assembly arranged between the front bracket, the rear bracket and the push rod frame to realize the linkage between the front bracket, the rear bracket and the push rod frame, so as to realize the unfolding and folding of the stroller frame. At present, the number of rods of baby strollers is generally large, and the size after folding is still large, and the overall weight is large, which is not conducive to daily carrying, and is also not conducive to reducing production costs. Summary of the invention

[0003] The object of the present invention is to provide a new stroller to solve one or more problems of the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a cart, the cart has an expanded state and a folded state, the cart comprises a front bracket, a rear bracket, a push rod frame, a connecting frame, a front wheel assembly and a rear wheel assembly, when the cart is in the expanded state, the upper part of the rear bracket is rotatably connected to the front bracket, the lower part of the push rod frame is rotatably connected to the rear bracket, the front part of the connecting frame is rotatably connected to the upper part of the front bracket, the rear part of the connecting frame is rotatably connected to the push rod frame, the front wheel assembly is arranged at the bottom of the front bracket, and the rear wheel assembly is arranged at the bottom of the rear bracket, when the cart is in the folded state, the front bracket, the rear bracket, the push rod frame and the connecting frame all extend in the up-down direction and are retracted together in the front-back direction.

[0005] Preferably, the cart further includes a support seat and a seat mechanism, the seat mechanism includes at least a seat, and the seat is mounted on the support seat, wherein the support seat is rotatably connected to the upper portion of the front bracket or is rotatably connected to the front portion of the connecting frame, or the support seat is rotatably connected to the upper portion of the front bracket and the front portion of the connecting frame around the same rotation center line, and when the cart is in a folded state, the support seat and the seat mechanism are together folded at the front side of the front bracket or folded at the rear side of the connecting frame.

[0006] In some embodiments, the seat mechanism also includes a backrest, the lower portion of the backrest is rotatably connected to one end portion of the seat, and the seat can be rotatably connected to the support seat around a rotation centerline extending in the up-down direction. When the cart is in the unfolded state, the seat mechanism has at least a forward use position and a reverse use position. In the forward use position, the backrest is located between the seat and the push rod frame; in the reverse use position, the seat is located between the backrest and the push rod frame.

[0007] In some embodiments, the seat mechanism also includes a backrest, the lower portion of which is rotatably connected to one end portion of the seat, the push rod frame extends upward from front to rear, and when the cart is in the unfolded state, at least part of the structure of the push rod frame extends behind the backrest.

[0008] In some embodiments, when the stroller is in the unfolded state, the push rod frame is substantially parallel to the backrest.

[0009] In some embodiments, when the cart is in the unfolded state, the angle between the extension direction of the push rod frame and the horizontal plane is 75°±10°.

[0010] In some embodiments, when the stroller is in the unfolded state, the connecting frame extends downwardly from front to rear, and the connecting frame has an extension portion located behind the push rod frame. When the seat mechanism is in the reverse use position, the extension portion forms a support portion that can provide support for the feet of the sitter.

[0011] In some embodiments, the cart further includes a connecting member, one end of which is connected to the front bracket or the rear bracket, and the other end of which is connected to the connecting frame to enclose a accommodating space.

[0012] In some embodiments, the support seat is rotatably connected to the upper portion of the front bracket and the front portion of the connecting frame around a rotation center line. When the cart is in a folded state, the support seat and the seat mechanism are folded together on the front side of the front bracket.

[0013] In some embodiments, the push rod frame includes a lower push rod frame and an upper push rod frame, the lower push rod frame is rotatably connected to the connecting frame and the rear bracket, and the upper push rod frame can be expanded and folded relative to the lower push rod frame along the length direction.

[0014] In some embodiments, the lower portion of the upper push rod frame is rotatably connected to the upper portion of the lower push rod frame. When the cart is in an unfolded state, the upper push rod frame extends in an up-down direction and is located as a whole above the lower push rod frame; when the cart is in a folded state, the upper push rod frame is folded behind the lower push rod frame.

[0015] In some embodiments, the rear bracket includes a bracket body extending in the up and down directions, and a rear wheel joint fixed to the lower part of the bracket body, the rear wheel joint extends backward from the lower part of the bracket body, the rear wheel assembly is installed at the rear part of the rear wheel joint, and the lower part of the push rod frame is rotatably connected to the front part of the rear wheel joint.

[0016] In some embodiments, the rear wheel joints have two groups arranged on the left and right sides, and a rear wheel assembly is provided at the rear of each group of the rear wheel joints; when the cart is in a folded state, the front wheel assembly is folded between the two groups of the rear wheel assemblies, and the rear wheel assembly is located as a whole in front of the rearmost end of the front wheel assembly in the front-to-back direction.

[0017] In some embodiments, the upper portion of the rear bracket is rotatably connected to the front bracket around a first center line, the lower portion of the push rod bracket is rotatably connected to the lower portion of the rear bracket around a second center line, the rear portion of the connecting frame is rotatably connected to the push rod bracket around a third center line, the upper portion of the front bracket is rotatably connected to the front portion of the connecting frame around a rotation center line, and when the cart is in an expanded state, the first center line, the rotation center line, the second center line, and the third center line are parallel to each other and are distributed sequentially in the front-to-back direction.

[0018] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the cart provided by the present invention mainly includes a front bracket, a rear bracket, a connecting frame and a push rod frame, the overall number of rods is small, the structure is simple, and the folding operation is convenient. The size of the cart after folding is relatively small, and the structure after folding is relatively flat, which brings great convenience to users' daily carrying and storage.

[0019] Furthermore, by rotatably connecting the support seat to the upper part of the front bracket or the front part of the connecting frame and arranging a seat mechanism on the support seat, the seat mechanism can have a forward use position and a reverse position on the cart, and the seat mechanism can be folded relative to the front bracket or the connecting frame and folded together with other rods in the cart, which will not cause an excessive increase in the size of the cart after folding, and does not need to be disassembled and folded separately, which is convenient for users' daily use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Attached Figure 1It is a schematic diagram of the three-dimensional structure of a stroller frame of a child stroller according to a specific embodiment of the present invention in an unfolded state, wherein the seat mechanism is in a forward use position;

[0022] Attached Figure 2 For attachment Figure 1 A schematic diagram of the side view structure of a cart;

[0023] Attached Figure 3 For attachment Figure 2 A side view schematic diagram of the structure of the seat mechanism in the stroller being converted to a reverse use position;

[0024] Attached Figure 4 For attachment Figure 1 A front view structural diagram of a cart;

[0025] Attached Figure 5 For attachment Figure 1 A schematic diagram of the structure of a cart from a top view;

[0026] Attached Figure 6 For attachment Figure 2 Based on the above, a schematic diagram of the seat mechanism after the backrest is folded relative to the seat;

[0027] Attached Figure 7 For attachment Figure 6 Based on the above, a schematic diagram of the upper push rod frame after being shortened along the length direction;

[0028] Attached Figure 8 For attachment Figure 7 On the basis of, the upper push rod frame is flipped and folded relative to the lower push rod frame, and the structural schematic diagram of the relative folding process of each rod in the cart;

[0029] Attached Fig. 9 For attachment Figure 8 A schematic diagram of the structure of the cart after it is further folded;

[0030] Attached Fig.10 For attachment Fig. 9 A schematic diagram of the structure of the cart after further folding;

[0031] Attached Fig.11 For attachment Figure 1 A schematic diagram of the side view structure of the cart when it is converted into a folded state;

[0032] Attached Fig.12 For attachment Fig.11 A rear view structural diagram of ;

[0033] Among them: 1. front bracket; 11. front support rod; 12. front cross bar; 2. rear bracket; 21. bracket body; 22. rear wheel joint; 3. connecting frame; 31. extension part; 3a. connecting rod; 3b. connecting cross bar; 4. push rod frame; 41. lower push rod frame; 411. lower push rod; 42. upper push rod frame; 5. support seat; 6. seat mechanism; 61. seat; 62. backrest; 10. front wheel assembly; 20. rear wheel assembly. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Herein, the directions or positional relationships indicated by "up", "down", "left", "right", etc. are defined based on the directions and positional relationships observed by the user when pushing the stroller. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0036] Figures 1 to 12 The drawings are drawn in true proportion. To keep the specification concise, the proportions of each component are not listed one by one. However, the proportions and positions of each component should be regarded as part of the content of this specification.

[0037] See also Figures 1 to 12 A cart shown has an unfolded state and a folded state, and the cart comprises a front frame 1, a rear frame 2, a push rod frame 4, a connecting frame 3, a front wheel assembly 10 and a rear wheel assembly 20. When the cart is in the unfolded state, the front frame 1 extends obliquely from front to rear and upward, the rear frame extends obliquely from rear to front and upward, the connecting frame 3 extends in the front-to-back direction, the push rod frame 3 extends in the up-down direction and extends obliquely from top to bottom and forward, wherein the upper portion of the rear frame 2 is rotatably connected to the front frame 1, the lower portion of the push rod frame 4 is rotatably connected to the rear frame 2, the front portion of the connecting frame 3 is rotatably connected to the upper portion of the front frame 1, the rear portion of the connecting frame 3 is rotatably connected to the push rod frame 4, the front wheel assembly 10 is arranged at the bottom of the front frame 1, and the rear wheel assembly 20 is arranged at the bottom of the rear frame 2. When the cart is folded, the front frame 1, the rear frame 2, the connecting frame 3 and the push rod frame 4 rotate with each other and retract with each other in the front-to-back direction; when the cart is in the folded state, as shown in FIG. Fig.11 , Fig.12As shown, the front bracket 1, the rear bracket 2, the connecting frame 3 and the push rod frame 4 are all converted to extend in the up-down direction and fold together in the front-back direction, and the front wheel assembly 10 and the rear wheel assembly 20 are folded together.

[0038] The cart further includes a support seat 5 and a seat mechanism 6, wherein the seat mechanism 6 includes at least a seat 61, which is mounted on the support seat 5. The support seat 5 is rotatably connected to the upper portion of the front bracket 1 or the front portion of the connecting frame 3, or the support seat 5 is rotatably connected to the upper portion of the front bracket 1 and the front portion of the connecting frame 3 around the same rotation center. When the cart is in the unfolded state, the seat 61 is roughly horizontal, providing the user with a sitting support; when the cart is folded, the support seat 5 rotates with the seat mechanism 6 relative to the front bracket 1 or the connecting frame 3, so that the support seat 5 can be flipped forward to the front side of the front bracket 1 or flipped backward to the rear side of the connecting frame 3. In this way, when the cart is in the folded state, the support seat 5 and the seat mechanism 6 are folded together at the front side of the front bracket 1 or the rear side of the connecting frame 3, and there is no need to remove the seat mechanism 6 and fold it separately.

[0039] The seat mechanism 6 also includes a backrest 62, the lower part of which is rotatably connected to one end of the seat 61. The seat 61 can be rotatably connected to the support base 5 around a rotation center line Y extending in the vertical direction, so that the seat mechanism 6 can be used in a reverse direction. Specifically, when the stroller is in the unfolded state, the seat mechanism 6 has at least a forward use position and a reverse use position. In the forward use position, as shown in FIG. Figure 1 , Figure 2 As shown, in the front-to-back direction, the backrest 62 is located between the seat 61 and the push rod frame 4, and the person sitting on the seat 61 faces away from the pusher and faces the direction of the stroller; in the reverse use position, as shown in FIG. Figure 3 As shown, the seat 61 is located between the backrest 62 and the push rod frame 4, and the person sitting on the seat 61 faces away from the direction in which the stroller travels and faces the pusher.

[0040] As shown in the drawings, in the cart provided in this embodiment, each rod is specifically arranged in the following manner:

[0041] The front support 1 includes a front support rod 11 extending in the up-down direction, and a front cross bar 12 provided at the lower part of the front support rod 11 and extending in the left-right direction. The lower part of the front support rod 11 is connected to the middle part of the front cross bar 12. There are two sets of front wheel assemblies 10, which are respectively installed at the left and right ends of the front cross bar 12. Here, the front cross bar 12 is configured as a footrest to provide support for the feet of the seated person when the seat mechanism 6 is in the forward use position.

[0042] The push rod frame 4 includes a lower push rod frame 41 and an upper push rod frame 42. The lower push rod frame 41 is rotatably connected to the connecting frame 3 and the rear bracket 2. The upper push rod frame 42 can be arranged to be unfolded or folded relative to the lower push rod frame 41 along the length direction. Here, the lower part of the upper push rod frame 42 is rotatably connected to the upper part of the lower push rod frame 41. The two can realize the unfolding and folding of the push rod frame 4 along the length direction by relative flipping. When the cart is in the unfolded state, the upper push rod frame 42 is located above the lower push rod frame 41 as a whole. Specifically, the upper push rod frame 42 and the lower push rod frame 41 extend along the same length direction. When the cart is in the unfolded state, the push rod frame 4 extends upward from front to back, and at least part of the structure of the push rod frame 4 extends behind the backrest 62. In some embodiments, the push rod frame 4 is substantially parallel to the backrest 62, and the cart looks more beautiful in structure when in the unfolded state. In specific configuration, when the push cart is in the unfolded state, the angle between the extension direction of the push rod frame 4 and the horizontal plane is 75°±10°, which makes it easier for the user to hold and apply force when pushing the push cart.

[0043] In this embodiment, the upper push rod frame 42 itself can be telescopically arranged along the length direction, so that the push rod frame 4 can meet the pushing requirements when fully unfolded, and its folded size can be as small as possible, which is conducive to reducing the size of the entire cart after folding.

[0044] The rear bracket 2 includes two bracket bodies 21 which are respectively arranged on the left and right sides and extend in the up-down direction. The upper parts of the two bracket bodies 21 are commonly connected to the front support rod 11 by rotation around the first center line X1. The two bracket bodies 21 extend outward from top to bottom along the left-right direction. The lower part of each bracket body 21 is fixedly provided with a rear wheel joint 22. When the cart is in the unfolded state, the rear wheel joint 22 extends backward from the lower part of the bracket body 21. The rear wheel assembly 20 is installed at the rear part of the rear wheel joint 22. The lower part of the push rod frame 4 is rotationally connected to the front part of the rear wheel joints 22 on both sides. Specifically, the lower push rod frame 41 has two lower push rods 411 which are respectively arranged on the left and right sides and extend in the up-down direction. The lower push rods 411 on both sides are respectively rotationally connected to the front part of the corresponding side rear wheel joint 22 around the second center line X2.

[0045] The front part of the connecting frame 3 is rotatably connected to the upper part of the front bracket 1 around the rotation center line X0, and the rear part of the connecting frame 3 is rotatably connected to the push rod frame 4 around the third center line X3. When the stroller is in the unfolded state, the connecting frame 3 extends downwardly from the front to the rear, and the connecting frame 3 has an extension part 31 located behind the push rod frame 4. When the seat mechanism 6 is in the reverse use position, the extension part 31 forms a support part that can be supported by the feet of the sitting person, that is, when the child sits facing the pusher, his feet can be supported on the extension part 31. The extension part 31 can also be used to fix the basket cloth cover for storage.

[0046] Specifically here, the connecting frame 3 has two connecting rods 3a respectively arranged on the left and right sides, and a connecting cross bar 3b arranged between the rear parts of the two connecting rods 3a. The connecting rods 3a on both sides are respectively rotatably connected to the lower push rods 411 on the corresponding sides around the second center line X2. The connecting rods 3a on each side are rotatably connected to the lower push rod 411 on the side where they are located. The rod section of the connecting rod 3a located on the second center line X2 and the connecting cross bar 3b together constitute an extension portion 31.

[0047] In this embodiment, the upper portion of the front frame 1, the front portion of the connecting frame 3 and the support seat 5 are connected to rotate around the rotation center line X0. When the stroller is folded, the support seat 5 and the seat mechanism 6 are flipped forward relative to the front frame 1 and the connecting frame 3, so that the seat mechanism 6 is folded in front of the front frame 1. The rotation center line X0, the first center line X1, the second center line X2, and the third center line X3 all extend in the left-right direction and are parallel to each other.

[0048] Although not shown in the figure, the cart further includes a connecting member, one end of which is connected to the front support 1 or the rear support 2, and the other end is connected to the connecting frame 3 to enclose a storage space, which can be used for storing items, so that users can carry some items with them.

[0049] The cart also includes a locking mechanism for locking it in the unfolded state. In this embodiment, the locking mechanism may include one or a combination of two or more of the following locking components: (1) a first locking component provided between the upper portion of the front bracket 1, the front portion of the connecting frame 3 and the support seat 5 to lock them with each other; (2) a second locking component provided on the push rod frame 4 to lock the upper push rod frame 42 relative to the lower push rod frame 41; (3) a third locking component provided between the seat 61 and the support seat 5 to lock the seat mechanism 6 in the forward use position or the reverse use position; (4) a fourth locking component provided between the backrest 62 and the seat 61 to lock the seat mechanism 6 in the unfolded state.

[0050] The stroller is in the unfolded state. Figures 1 to 5 As shown, the front bracket 1, the rear bracket 2, the connecting frame 3 and the push rod frame 4 are open relative to each other, and the upper push rod frame 42 of the push rod frame 4 is stretched along the length direction and unfolded relative to the lower push rod frame 41; the first center line X1, the rotation center line X0, the second center line X2, and the third center line X3 are distributed in sequence in the front-to-back direction, and the front wheel assembly 10 and the rear wheel assembly 20 are supported on the ground together, and there is a large distance between the front wheel assembly 10 and the rear wheel assembly 20, which can provide stable support. The seat mechanism 6 can be rotated around the rotation center line Y0 so that the seat mechanism 6 is in a position as shown in FIG. Figure 2 Forward use position as shown, or converted to Figure 3 The reverse use position shown is also convenient for conversion operation.

[0051] When the seat mechanism 6 is in the forward use position and the stroller needs to be folded up, the following steps can be followed: Figure 6 As shown, the backrest 62 is rotated and folded relative to the seat 61; then, see Figures 7 to 10 As shown, the upper push rod frame 42 is retracted along the length direction to reduce the length, and then the upper push rod frame 42 is driven to flip backward relative to the lower push rod frame 41, and the push rod frame 4 is driven to rotate as a whole, so that the front bracket 1, the rear bracket 2, the push rod frame 4 and the connecting frame 3 rotate relative to each other and gradually close in the front-to-back direction. Finally, the folded stroller is as shown in FIG. Fig.11 , Fig.12 As shown, the front bracket 1, the rear bracket 2, the connecting frame 3 and the push rod frame 4 are folded in the front-to-back direction, and the seat mechanism 6 is folded in front of the front bracket 1, wherein the front bracket 1, the rear bracket 2 and the connecting frame 3 are mostly folded between the lower push rods 411 on both sides of the push rod frame 4, so as to be as close as possible in the front-to-back direction, and the rear wheel assembly 20 is folded forward as much as possible, and is located in front of the rear end of the front wheel assembly 10 as a whole, which reduces the size of the cart in the front-to-back direction after folding. The structure of the folded cart is relatively flat, which brings convenience to the user's daily storage and carrying.

[0052] Not shown, when the seat mechanism 6 is in the reverse use position and the stroller needs to be folded up, Figures 6 to 10 The difference between the steps shown is that the seat mechanism 6 can be folded behind the connecting frame 3, and folded into a structure after the front bracket 1, the rear bracket 2, the connecting frame 3 and the push rod frame 4 are folded together in the front and rear directions. It can also realize the folding operation of the seat mechanism 6 and the size after folding is still small.

[0053] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. If there is any conflict or inconsistency between the definitions used in this article and the definitions contained in other public documents, the definitions used in this article shall prevail.

[0054] It should also be noted that the "rotational connection" in the above embodiments refers to a pivot connection, unless the context clearly indicates other rotational connection methods.

[0055] As shown in this specification and claims, the terms "comprises" and "includes" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0056] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A cart, characterized in that: The cart has an expanded state and a folded state, and the cart includes a front bracket, a rear bracket, a push rod bracket, a connecting frame, a front wheel assembly and a rear wheel assembly. When the cart is in the expanded state, the upper portion of the rear bracket is rotatably connected to the front bracket, the lower portion of the push rod bracket is rotatably connected to the rear bracket, the front portion of the connecting frame is rotatably connected to the upper portion of the front bracket, and the rear portion of the connecting frame is rotatably connected to the push rod bracket, the front wheel assembly is arranged at the bottom of the front bracket, and the rear wheel assembly is arranged at the bottom of the rear bracket. When the cart is in the folded state, the front bracket, the rear bracket, the push rod bracket and the connecting frame all extend in the up-down direction and are retracted toward each other in the front-to-back direction.

2. The cart according to claim 1, characterized in that: The cart also includes a support seat and a seat mechanism, the seat mechanism includes at least a seat, and the seat is installed on the support seat, wherein the support seat is rotatably connected to the upper portion of the front bracket or is rotatably connected to the front portion of the connecting frame, or the support seat is rotatably connected to the upper portion of the front bracket and the front portion of the connecting frame around the same rotation center line, and when the cart is in a folded state, the support seat and the seat mechanism are together folded at the front side of the front bracket or at the rear side of the connecting frame.

3. The cart according to claim 2, characterized in that: The seat mechanism also includes a backrest, the lower part of which is rotatably connected to one end of the seat, and the seat can be rotatably connected to the support seat around a rotation center line extending in the up-down direction. When the cart is in the unfolded state, the seat mechanism has at least a forward use position and a reverse use position. In the forward use position, the backrest is located between the seat and the push rod frame; in the reverse use position, the seat is located between the backrest and the push rod frame; And / or, the seat mechanism further comprises a backrest, the lower portion of the backrest is rotatably connected to one end portion of the seat, the push rod frame extends obliquely upward from front to rear, and when the stroller is in the unfolded state, at least a portion of the push rod frame extends behind the backrest; and / or, when the stroller is in the unfolded state, the push rod frame is substantially parallel to the backrest; And / or, when the cart is in the unfolded state, the angle between the extension direction of the push rod frame and the horizontal plane is 75°±10°.

4. The cart according to claim 3, characterized in that: When the stroller is in the unfolded state, the connecting frame extends obliquely downward from the front to the rear, and the connecting frame has an extension portion located behind the push rod frame, and when the seat mechanism is in the reverse use position, the extension portion forms a support portion capable of providing support for the feet of a sitter; and / or, The cart further comprises a connecting member, one end of which is connected to the front support or the rear support, and the other end of which is connected to the connecting frame to enclose a containing space.

5. The cart according to claim 2, characterized in that: The support seat is rotatably connected with the upper portion of the front bracket and the front portion of the connecting frame around a rotation center line. When the cart is in a folded state, the support seat and the seat mechanism are folded together at the front side of the front bracket.

6. The cart according to claim 1, characterized in that: The push rod frame comprises a lower push rod frame and an upper push rod frame, the lower push rod frame is rotatably connected to the connecting frame and the rear bracket, and the upper push rod frame can be arranged to be unfolded and folded along the length direction relative to the lower push rod frame.

7. The cart according to claim 6, characterized in that: The lower part of the upper push rod frame is rotatably connected to the upper part of the lower push rod frame. When the cart is in the unfolded state, the upper push rod frame extends in the up and down direction and is located above the lower push rod frame as a whole; when the cart is in the folded state, the upper push rod frame is folded behind the lower push rod frame.

8. The cart according to claim 1, characterized in that: The rear bracket includes a bracket body extending in the up-down direction, and a rear wheel joint fixedly arranged at the lower part of the bracket body, the rear wheel joint extends rearward from the lower part of the bracket body, the rear wheel assembly is installed at the rear part of the rear wheel joint, and the lower part of the push rod frame is rotatably connected to the front part of the rear wheel joint.

9. The cart according to claim 8, characterized in that: The rear wheel joints have two groups arranged on the left and right sides, and a rear wheel assembly is arranged at the rear of each group of the rear wheel joints; when the cart is in a folded state, the front wheel assembly is folded between the two groups of the rear wheel assemblies, and the rear wheel assembly is located as a whole in front of the rearmost end of the front wheel assembly in the front-to-back direction.

10. The cart according to claim 1, characterized in that: The upper portion of the rear bracket is rotatably connected to the front bracket around a first center line, the lower portion of the push rod bracket is rotatably connected to the lower portion of the rear bracket around a second center line, the rear portion of the connecting frame is rotatably connected to the push rod bracket around a third center line, the upper portion of the front bracket is rotatably connected to the front portion of the connecting frame around a rotation center line, and when the cart is in an expanded state, the first center line, the rotation center line, the second center line, and the third center line are parallel to each other and are distributed sequentially in the front-to-back direction.

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