Frame and cart

Abstract

The utility model discloses a frame and a cart, and relates to the technical field of carts, a support assembly comprises a push rod, a front support and a rear support, the front support and the rear support rotate relative to the push rod, two of the front support, the rear support and the push rod are rotationally connected, and the third part is rotationally connected with at least one of the two parts; the linkage assembly comprises a connecting rod assembly and a push rod connecting rod which are rotationally connected with the front support and the rear support respectively, the connecting rod assembly can be folded to enable the front support and the rear support to be close to each other, one end of the push rod connecting rod is movably connected with the push rod, and the other end of the push rod connecting rod is movably connected with the connecting rod assembly. The joint position of the push rod connecting rod and the push rod is closer to the first end of the push rod than the second end of the push rod; according to the technical scheme provided by the utility model, the push rod can automatically fold the frame under the action of gravity, so that the simplicity and convenience of the folding process of the conventional cart are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carts, in particular to a frame and a cart. Background Art

[0002] In order to facilitate the carrying and storage of the existing strollers, the stroller frames constituting the strollers are generally foldable. During the folding process, different parts of the stroller need to be folded separately, and during the unfolding process, different parts of the stroller also need to be operated separately to unfold the stroller as a whole. The whole operation is relatively cumbersome, and even if some strollers can be automatically folded, the user still needs to lift the frame upwards or press down the frame during the folding process, and the stroller cannot be folded into place quickly, that is, the folding process is complicated. Utility Model Content

[0003] The main purpose of the utility model is to provide a frame and a cart, aiming to improve the simplicity of the folding process of the existing cart.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a frame, comprising:

[0005] A bracket assembly includes a push rod, a front bracket and a rear bracket that rotate relative to the push rod, two of the three components of the front bracket, the rear bracket and the push rod are rotatably connected, and the third component is rotatably connected to at least one of the two components; and,

[0006] A linkage assembly, the linkage assembly comprising a connecting rod assembly and a push rod connecting rod respectively rotatably engaged with the front bracket and the rear bracket, the connecting rod assembly can be folded to bring the front bracket and the rear bracket closer; one end of the push rod connecting rod is movably connected to the push rod, and the other end of the push rod connecting rod is movably connected to the connecting rod assembly; when the push rod moves closer to the rear bracket, the push rod connecting rod drives the connecting rod assembly to fold;

[0007] The push rod has a first end and a second end arranged opposite to each other along its extension direction, the first end of the push rod is rotatably connected to the front bracket and / or the rear bracket, and the engaging position of the push rod connecting rod and the push rod is closer to the first end of the push rod than the second end of the push rod, so that the push rod can move toward the rear bracket under the action of its own gravity and drive the push rod connecting rod to move.

[0008] In one embodiment, the push rod assembly includes two rotatably arranged connecting rods, and the two connecting rods are rotatably connected to the front bracket and the rear bracket respectively;

[0009] The push rod link is movably connected to one of the connecting rods, so that when the push rod approaches the rear bracket under its own gravity, the two connecting rods are driven to approach and fold by the push rod link.

[0010] In one embodiment, the two connecting rods include a first connecting rod connected to the front bracket and a second connecting rod connected to the rear bracket;

[0011] The push rod link is movably connected to the first connecting rod;

[0012] Compared with the second connecting rod, the joint position of the push rod link and the first connecting rod is located on the first connecting rod at a position closer to the rear bracket.

[0013] In one embodiment, the connecting rod has a first side and a second side oppositely arranged along its width direction. The first side of the connecting rod is arranged towards the joint of the three components, and the second side of the connecting rod faces away from the joint of the three components;

[0014] The joint position of the push rod link and the connecting rod is closer to the first side of the connecting rod compared with the second side of the connecting rod.

[0015] In one embodiment, an installation portion is convexly provided outward on the first side of the connecting rod, and the push rod link is movably connected to the installation portion.

[0016] In one embodiment, the bracket assembly has a folded state and an unfolded state. In the unfolded state, the two connecting rods extend along the same direction, and at least one of the connecting rods extends substantially along a direction parallel to the transverse direction.

[0017] In one embodiment, the vehicle frame further includes a seat post and a linkage rod. The seat post is rotatably installed on the bracket assembly;

[0018] Both ends of the linkage rod are respectively movably connected to the linkage assembly and the seat post, so that when the linkage assembly folds, the seat post is driven to approach the front bracket through the linkage rod;

[0019] The vehicle frame further has a backrest rotatably connected to the seat post. The connection position of the linkage rod and the seat post and the connection position of the backrest and the seat post are respectively located on both sides of the rotation connection position of the seat post and the bracket assembly.

[0020] In one embodiment, the push rod assembly includes two connecting rods rotatably arranged. The two connecting rods are respectively rotatably connected to the front bracket and the rear bracket;

[0021] The linkage rod is movably connected to at least one of the connecting rods;

[0022] The joint position of the linkage rod and the connecting rod coincides with the joint position of the two connecting rods.

[0023] In one embodiment, the projection of the center of gravity of the push rod on the bottom surface of the vehicle frame is located outside the projection of the linkage assembly on the bottom surface of the vehicle frame.

[0024] To achieve the above object, the present application further provides a trolley, including the vehicle frame described above.

[0025] According to the technical solution of the present utility model, by providing the linkage assembly to connect the push rod, the front bracket and the rear bracket, when the user needs to store and fold the vehicle frame, since the joint position of the push rod link and the push rod is closer to the first end of the push rod than the second end of the push rod, therefore, the push rod can move closer to the rear bracket under its own gravity. At the same time, it can drive the push rod link to move, so as to drive the link assembly to fold. Under the folding of the link assembly, the front bracket and the rear bracket move closer to each other, realizing the folding of the entire vehicle frame. During the entire folding process, the push rod can complete the folding of the entire vehicle frame relying on its own gravity, without the need for the user to perform additional operations, improving the simplicity of the existing trolley folding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the vehicle frame provided by the present utility model;

[0028] Figure 2 For Figure 1 the side view of the vehicle frame in

[0029] Figure 3 For Figure 1 the schematic structural diagram of the vehicle frame in the semi-folded state in

[0030] Figure 4 For Figure 3 the three-dimensional schematic diagram of the vehicle frame in

[0031] Figure 5 For Figure 1 the schematic structural diagram of the vehicle frame in the fully folded state in

[0032] Figure 6 is Figure 5 a three-dimensional schematic diagram of the vehicle frame in

[0033] Explanation of the reference numerals in the attached drawings:

[0034] 100, vehicle frame; 1, support assembly; 11, push rod; 12, rear support; 13, front support; 16, first side; 17, second side; 18, mounting portion; 19, ejector rod; 20, vertical rod; 2, linkage assembly; 21, first connecting rod; 22, second connecting rod; 23, push rod linkage; 3, mounting bracket; 4, seat post; 41, linkage rod; 42, first push rod section; 43, second push rod section.

[0035] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions such as "first", "second" in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0039] In order to facilitate the carrying and storage of the existing strollers, the stroller frames constituting the strollers are generally foldable. During the folding process, different parts of the stroller need to be folded separately, and during the unfolding process, different parts of the stroller also need to be operated separately to unfold the stroller as a whole. The whole operation is relatively cumbersome, and even if some strollers can be automatically folded, the user still needs to lift the frame upwards or press down the frame during the folding process, and the stroller cannot be folded into place quickly, that is, the folding process is complicated.

[0040] The utility model provides a frame 100, which is applied to a cart. Figure 1 A structural schematic diagram of an embodiment of a frame 100 provided by the utility model; Figure 2 for Figure 1 A side view of the mid-frame 100;

[0041] Figure 3 for Figure 1 A schematic diagram of the structure of the middle frame 100 in a semi-folded state; Figure 4 for Figure 3 A three-dimensional schematic diagram of a vehicle frame 100; Figure 5 for Figure 1 A schematic diagram of the structure of the middle frame 100 in a folded state; Figure 6 for Figure 5 For a perspective schematic diagram of the frame 100, please refer to Figures 1 to 6 In one embodiment of the utility model, the frame 100 includes a bracket assembly 1 and a linkage assembly 2, wherein the bracket assembly 1 includes a push rod 11, a front bracket 13 and a rear bracket 12 that rotate relative to the push rod 11, two of the three components of the front bracket 13, the rear bracket 12 and the push rod 11 are rotatably connected, and the third component is rotatably connected to at least one of the two components; the linkage assembly 2 includes a connecting rod assembly and a push rod connecting rod 23 that are rotatably engaged with the front bracket 13 and the rear bracket 12 respectively, and the connecting rod assembly can be folded to bring the front bracket 13 and the rear bracket 12 closer; one of the push rod connecting rods 23 One end is movably connected to the push rod 11, and the other end of the push rod connecting rod 23 is movably connected to the connecting rod assembly; when the push rod 11 moves toward the rear bracket 12, the push rod connecting rod 23 drives the connecting rod assembly to fold; the push rod 11 has a first end and a second end arranged opposite to each other along its extension direction, the first end of the push rod is rotatably connected to the front bracket 13 and / or the rear bracket 12, and the engaging position of the push rod connecting rod 23 and the push rod 11 is closer to the first end of the push rod than the second end of the push rod, so that the push rod 11 can move toward the rear bracket 12 under the action of its own gravity and drive the push rod connecting rod 23 to move.

[0042] The technical solution of the present utility model is to connect the push rod 11, the front bracket 13 and the rear bracket 12 by setting the linkage assembly 2. When the user needs to store and fold the vehicle frame 100, since the engagement position of the push rod link 23 and the push rod 11 is closer to the first end of the push rod than the second end of the push rod, therefore, the push rod 11 can move closer to the rear bracket 12 under its own gravity. At the same time, it can drive the push rod link 23 to move, so as to drive the folding of the link assembly. Under the folding of the link assembly, the front bracket 13 and the rear bracket 12 move closer, realizing the folding of the entire vehicle frame 100. During the entire folding process, the push rod 11 can complete the folding of the entire vehicle frame 100 relying on its own gravity, without the need for the user to perform additional operations, improving the simplicity of the existing folding process of the stroller.

[0043] Two of the three components of the front bracket 13, the rear bracket 12 and the push rod 11 are rotatably connected, and the third component is rotatably connected to at least one of the aforementioned two components. Specifically, it can be that the push rod 11, the front bracket 13 and the rear bracket 12 are rotatably connected to each other pairwise. For example, one end of the front bracket 13 and the rear bracket 12 is rotatably connected by a rotating shaft, and the first end of the push rod is rotatably connected to the front bracket 13 and / or the rear bracket 12. Of course, it is also possible to only set one rotating shaft for the three components of the front bracket 13, the rear bracket 12 and the push rod 11. Of course, it is also possible not to set a rotating shaft, and directly set two rotating protrusions at one end of the push rod 11, and set two rotating holes at one end of the front bracket 13 and the rear bracket 12. Through the cooperation of the rotating holes and the rotating protrusions, the rotation connection of the front bracket 13, the rear bracket 12 and the push rod 11 is realized. In an embodiment, the rear bracket 12 has a mounting bracket 3 and a rod portion, the rod portion is rotatably or fixedly mounted on the mounting portion 18, and the front bracket 13 and the push rod 11 are rotatably mounted on the mounting bracket 3. In this way, the mounting bracket 3 can support the rotation of the push rod 11 and the front bracket 13, improving the stability during the rotation process.

[0044] The specific implementation form of the linkage assembly 2 is not limited, as long as it can be folded and the front bracket 13 and the rear bracket 12 can be pulled closer to each other when folded. It can be in the form of a telescopic tube, for example, the telescopic tube has two telescopic tube sections, and the push rod connecting rod 23 is transmission-connected to one of the tube sections. When the push rod 11 moves toward the rear bracket 12, the push rod connecting rod 23 is driven to move in the lateral direction, thereby changing the lateral length of the telescopic tube to bring the front bracket 13 and the rear bracket 12 closer. Of course, it can also be in the form of two connecting rods, for example, the two connecting rods are rotatably connected to the front bracket 13 and the rear bracket 12 respectively; the push rod connecting rod 23 is movably connected to one of the connecting rods, so that when the push rod 11 moves toward the rear bracket 12 under the action of its own gravity, the push rod connecting rod 23 drives the two connecting rods to move closer and fold. It can also be in the form of three connecting rods rotatably connected to each other, etc., which are not limited here.

[0045] It should be emphasized that the linkage assembly 2 can be provided with only one group or two groups, which is not limited here. Considering that the existing push rod 11 generally includes a top rod 19 and two vertical rods 20, the two vertical rods 20 are respectively connected to the left and right sides of the rear bracket 12, and the push rod connecting rod 23 is drivingly connected to the vertical rods 20. When the linkage assembly 2 is provided with only one group, only one side of the front bracket 13 and the rear bracket 12 can be driven to fold or unfold, and the other side of the front bracket 13 and the rear bracket 12 can only follow the The front bracket 13 and the rear bracket 12 are provided with one side of the linkage assembly 2 for movement, and the overall stability of the frame 100 during folding and unfolding is poor. Therefore, in a further embodiment, the linkage assembly 2 is provided with two groups, and the two groups of the linkage assembly 2 are respectively arranged on both sides of the rear bracket 12, and the push rod connecting rods 23 of the two groups of the linkage assembly 2 are respectively connected to the two vertical rods 20, so as to drive the front bracket 13 and the two sides of the rear bracket 12 at the same time through the rotation of the push rod 11, thereby improving the overall stability of the frame 100 during folding and unfolding.

[0046] Specifically, the specific implementation form of the push rod 11 is not limited. When the cart is actually used, the push rod 11 is used for the user to push it. Therefore, when the cart is in the unfolded state, the push rod 11 is located above the front bracket 13 and the rear bracket 12 in the longitudinal direction, and the front bracket 13 and the rear bracket 12 constitute the lower half of the frame 100, which plays a role in supporting and moving the cart.

[0047] The specific longitudinal direction is not limited. It can be the up-down direction, the left-right direction, or the front-back direction, without limitation here. In the actual use of the trolley, the longitudinal direction is the up-down direction, and the transverse direction is the horizontal direction.

[0048] Moreover, in the solution of this embodiment, during the folding process, under the action of its own gravity, the push rod 11 rotates in the direction close to the rear bracket 12. At this time, both the front bracket 13 and the rear bracket 12 are standing on the ground, and under the action of the two link assemblies, the front bracket 13 and the rear bracket 12 also rotate in the direction of approaching each other. During the entire rotation process, the front bracket 13 and the rear bracket 12 also remain in the state of standing on the ground. Therefore, the vehicle frame 100 can realize the function of folding and standing on its own and will not fall down during the folding process.

[0049] Further, the push rod 11 assembly includes two connecting rods rotatably arranged, and the two connecting rods are respectively rotatably connected to the front bracket 13 and the rear bracket 12; the push rod link 23 is movably connected to one of the connecting rods, so that when the push rod 11 approaches the rear bracket 12 under the action of its own gravity, the two connecting rods are driven to approach and fold through the push rod link 23.

[0050] In the solution of this embodiment, the push rod 11 assembly is composed of two connecting rods. Compared with the solutions of three or four connecting rods, its structure is simpler, which can improve the stability during the rotation process. During the folding process, the push rod 11 can approach the rear bracket 12 under the action of its own gravity and drive the push rod link 23 to move. The push rod link 23 drives one of the connecting rods to move towards the other connecting rod, so that the included angle between the two connecting rods becomes smaller, and the link assembly folds, and the length of the link assembly in the transverse direction becomes smaller, so that the front bracket 13 and the rear bracket 12 approach each other.

[0051] Specifically, the two connecting rods include a first connecting rod 21 connected to the front bracket 13 and a second connecting rod 22 connected to the rear bracket 12. One end of the push rod link 23 is connected to one of the connecting rods, which can be connected to the first connecting rod 21 or the second connecting rod 22. Please refer to Figure 2 , Figure 2Points C and F are the connection points of the two connecting rods with the rear bracket 12 and the front bracket 13 respectively. Point D is the connection point of the push rod link 23 and the connecting rod. In other words, point D can be set at any position between C and F, which is not limited here. It can be understood that if one end of the push rod link 23 is connected to the second connecting rod 22, at this time, the length of the push rod link 23 needs to be relatively long, and the stability of the transmission when the push rod 11 is pressed down is poor. Moreover, in the unfolded state, the angle between the push rod link 23 and the second connecting rod 22 is also small, which correspondingly leads to that at the beginning of folding, the longitudinal component of the force exerted by the push rod link 23 on the second connecting rod 22 is also relatively small, resulting in a relatively slow folding process and poor folding stability.

[0052] Therefore, in a further embodiment, Figure 2 Point G in the middle is the rotation connection point of the two connecting rods. One end of the push rod link 23 is connected to the first connecting rod 21, that is, point D is set between Figure 2 C and G in. Compared with the scheme of connecting to the second connecting rod 22, when one end of the push rod link 23 is connected to the first connecting rod 21, the first connecting rod 21 is closer to the push rod 11, so that the length of the push rod link 23 can be made smaller, so that the strength of the push rod link 23 is greater, which can better drive the movement of the push rod 11, improving the folding stability of the frame 100. Moreover, in the unfolded state, the angle between the push rod link 23 and the connecting rod is larger, and correspondingly, at the beginning of folding, the longitudinal component force is greater, which can better drive the movement of the first connecting rod 21 and accelerate the entire folding process, improving the stability during the folding process.

[0053] Furthermore, when the length of the push rod link 23 is constant, when one end of the push rod link 23 is connected to the first connecting rod 21, the connection position of the other end with the push rod 11 can be farther from the rotation center point of the push rod 11 than when one end of the push rod link 23 is connected to the second connecting rod 22. That is, when one end of the push rod link 23 is connected to the first connecting rod 21, the other end of the push rod link 23 can be farther away from the rotation center point of the push rod 11. Thus, during the rotation of the push rod 11, the end of the push rod link 23 connected to the push rod 11 has a larger longitudinal movement range, and further, the longitudinal movement range of the other end of the push rod link 23 is also larger, so that the rotation range of the front bracket 13 and the rear bracket 12 in the direction of approaching or separating from each other is also larger, enabling the front bracket 13 and the rear bracket 12 to be closer to each other during the folding and storage process, and the folded volume is smaller.

[0054] It should be emphasized that one end of the push rod link 23 is connected to one of the connecting rods, and the other end is connected to the push rod 11. It can be fixedly connected, so as to transmit a greater driving force, or it can be rotatably connected, so that the folding degree can be greater. Of course, the push rod link 23 can also be elastically arranged by itself, and the two ends are respectively fixedly connected to the push rod 11 and the connecting rod. At this time, not only can the rotation range of the front bracket 13 and the rear bracket 12 be guaranteed, but also sufficient driving force can be transmitted. This is not limited here. Considering that when the push rod link 23 is a rigid part and is fixedly connected to the push rod 11 and the connecting rod, after the push rod 11 rotates a certain stroke, it will interfere with the further rotation of the push rod 11, preventing it from further rotating towards the rear bracket 12, resulting in insufficient folding degree of the vehicle frame 100 and a large volume in the folded state, which requires a large amount of space. Therefore, in a further embodiment, the two ends of the push rod link 23 are respectively rotatably connected to the connecting rod and the push rod 11. Similarly, when one end of the push rod link 23 connected to the connecting rod is connected to the first connecting rod 21, in order to make the volume of the vehicle frame 100 small enough after folding, the push rod link 23 is rotatably connected to the first connecting rod 21.

[0055] At the same time, the connecting rod has a first end and a second end oppositely arranged along its length direction. The second ends of the two connecting rods are rotatably connected, and one end of the connecting rod is rotatably connected to the rear bracket 12. The connection position of the push rod link 23 on the first connecting rod 21 is not restricted, as long as it is not located at the connection position of the first connecting rod 21 and the rear bracket 12, that is, any position other than the first end of the first connecting rod 21 is acceptable. It can be the middle position in the length direction of the first connecting rod 21 or the second end of the first connecting rod 21. When it is located at the second end of the first connection, the second end of the first connecting rod 21 can be driven to move longitudinally with the smallest force. However, at this time, the longitudinal movement stroke of the second end of the first connecting rod 21 is synchronized with the longitudinal movement stroke of the end of the push rod link 23 connected to the first connecting rod 21, which will result in a smaller longitudinal movement stroke of the second end of the first connecting rod 21. The size of the longitudinal movement stroke of the second end of the first connecting rod 21 will also determine the size of the change in the transverse length of the first connecting rod 21, and at the same time determine the size of the rotation stroke of the front bracket 13 and the rear bracket 12 in the direction of approaching or separating from each other, and finally will determine the size of the volume of the vehicle frame 100 in the folded state.

[0056] When at the midpoint position in the length direction of the first connecting rod 21 at the connection between the push rod link 23 and the first connecting rod 21, the midpoint position of the first connecting rod 21 and the longitudinal movement stroke of the end of the push rod link 23 connected to the first connecting rod 21 are synchronized. Therefore, if the end of the push rod link 23 connected to the first connecting rod 21 moves 5 cm longitudinally, the midpoint position of the first connecting rod 21 will also move 5 cm longitudinally. At this time, according to the principle of similar triangles, it can be calculated that the longitudinal movement distance of the second end of the first connecting rod 21 is twice that of 5 cm, that is, 10 cm. Obviously, the greater the distance between the push rod link 23 and the second end of the first connecting rod 21, correspondingly, when the longitudinal movement stroke of the push rod link 23 is fixed, the longitudinal movement stroke of the second end of the first connecting rod 21 is greater.

[0057] Therefore, in a further embodiment, compared with the second connecting rod 22, the joint position of the push rod link 23 and the first connecting rod 21 is at a position on the first connecting rod 21 closer to the rear bracket 12, that is, at a position between the midpoint position in the length direction of the first connecting rod 21 and the second end of the first connecting rod 21 at the connection between the push rod link 23 and the first connecting rod 21. The distance from the connection between the push rod link 23 and the first connecting rod 21 to the second end of the first connecting rod 21 is less than half of the overall length of the first connecting rod 21. Correspondingly, the longitudinal movement distance of the second end of the first connecting rod 21 is more than twice the longitudinal movement distance of the connection between the push rod link 23 and the first connecting rod 21.

[0058] Specifically, please refer to Figure 2 , the connection between the push rod link 23 and the first connecting rod 21 is point D in the figure, the first end of the first connecting rod 21 is point C in the figure, and the second end of the first connecting rod 21 is point G in the figure. Since point D is between the midpoint position in the length direction of the first connecting rod 21 and the second end of the first connecting rod 21, that is, closer to point C compared with point G. At this time, if point D moves 5 cm longitudinally, point G can move at least more than 10 cm longitudinally.

[0059] Therefore, in the technical solution of this embodiment, by setting the joint position of the push rod link 23 and the first connecting rod 21 at a position on the first connecting rod 21 closer to the rear bracket 12, on the premise that the longitudinal movement range of the push rod link 23 remains unchanged, the longitudinal movement range of the second end of the connecting rod can be increased, so that the length change amount of the two connecting rods in the transverse direction is larger, and the front bracket 13 and the rear bracket 12 can be closer to each other, so that the overall volume of the vehicle frame 100 is smaller after folding.

[0060] Meanwhile, please refer to Figure 2 and Figure 4 . The connecting rod has a first side 16 and a second side 17 that are oppositely arranged in its width direction. Among them, the first side 16 of the connecting rod is arranged towards the joint of the three components, and the second side 17 of the connecting rod faces away from the joint of the three components. It can be understood that when the length of the push rod link 23 is constant, the closer the connection position of the push rod link 23 and the connecting rod is to the push rod 11, the greater the distance between the connection position of the push rod link 23 and the push rod 11 and the position where the push rod 11 is rotatably installed. Correspondingly, when the push rod 11 rotates by the same angle, the longitudinal movement distance of the end of the push rod link 23 connected to the push rod 11 is greater. At the same time, the distance change amount of the two connecting rods in the transverse direction will also be greater, and the overall volume of the vehicle frame 100 will be smaller when folding.

[0061] Taking Figure 2 as an example, point A is the rotational connection point of the push rod link 23 and the push rod 11, point B is the rotational connection point between the push rod 11 and the mounting bracket 3, and point D is the connection point of the push rod link 23 and the first connecting rod 21. During the rotation of the push rod 11, point A moves in a circular motion around point B. Therefore, the larger the distance AB, when the rotation angle of the push rod 11 is the same, the larger the longitudinal movement amount of point A. Similarly, the longitudinal movement amount of point D will also be larger, the length change amount of the two connecting rods in the transverse direction will also be larger, and the relative rotation amount of the front bracket 13 and the rear bracket 12 will also be larger. On the one hand, it can accelerate the folding process, and on the other hand, it can make the front bracket 13 and the rear bracket 12 closer to each other, so that the volume of the vehicle frame 100 after folding becomes smaller.

[0062] Therefore, in a further embodiment, the connecting rod has a first side 16 and a second side 17 which are oppositely arranged along its width direction. The first side 16 of the connecting rod is arranged towards the joint of the three components, and the second side 17 of the connecting rod faces away from the joint of the three components; the combination position of the push rod link 23 and the connecting rod is closer to the first side 16 of the connecting rod than the second side 17 of the connecting rod. In other words, point D is located Figure 2 in the upper half of the first connecting rod 21 in Figure 2 . Compared with the scheme where point D is located in the lower half of the first connecting rod 21, it can, on the premise that the length of the push rod link 23 remains unchanged, increase the distance between the connection position of the push rod link 23 and the push rod 11 and the position where the push rod 11 is rotatably installed. Thus, when the push rod 11 rotates by the same angle, the vertical movement of point G becomes larger, and the change in the lateral length of the two connecting rods also becomes larger. The front bracket 13 and the rear bracket 12 are closer to each other laterally, improving the folding effect of the frame 100.

[0063] Meanwhile, in order to further improve the folding effect of the frame 100, an installation portion 18 is convexly provided on the first side 16 of the connecting rod. The push rod link 23 is movably connected to the installation portion 18. In the solution of this embodiment, by providing the installation portion 18, the distance between the connection position of the push rod link 23 and the push 1 and the position where the push rod 11 is rotatably installed can be made larger, further improving the folding effect of the frame 100.

[0064] Specifically, the specific implementation form of the installation portion 18 is not limited and can be a boss, a protrusion, etc., which is not defined here.

[0065] In addition, two of the three components of the front bracket 13, the rear bracket 12 and the push rod 11 are rotatably connected, and the third component is rotatably connected to at least one of the two aforementioned components. Specifically, the push rod 11, the front bracket 13 and the rear bracket 12 may be rotatably connected in pairs. For example, the front bracket 13 and one end of the rear bracket 12 are rotatably connected via a rotating shaft, and the first end of the push rod is rotatably connected to the front bracket 13 and / or the rear bracket 12. Of course, only one rotating shaft may be provided, and the three components of the front bracket 13, the rear bracket 12 and the push rod 11 may also be rotatably connected. Therefore, instead of setting a rotating shaft, two rotating protrusions are directly set at one end of the push rod 11, and two rotating holes are set at one end of the front bracket 13 and the rear bracket 12. Through the cooperation of the rotating holes and the rotating protrusions, the front bracket 13, the rear bracket 12 and the push rod 11 are rotatably connected. In one embodiment, the rear bracket 12 has a mounting frame 3 and a rod portion, and the rod portion is rotatably or fixedly installed on the mounting portion 18. The front bracket 13 and the push rod 11 are rotatably installed on the mounting frame 3. With this arrangement, the mounting frame 3 can support the rotation of the push rod 11 and the front bracket 13, thereby improving the stability during the rotation process.

[0066] Specifically, the connection method between the mounting frame 3 and the push rod 11 and / or the front bracket 13 is not limited, and can be connected by a rotating shaft or by a rotating protrusion and a rotating hole. No limitation is made here. In a further embodiment, the mounting frame 3 has a mounting portion 18, and the mounting portion 18 is provided with a slot. The push rod 11 and / or the front bracket 13 are provided with a cam, and the cam is rotatably installed in the slot. By providing the cam and the slot, when the frame 100 is in the unfolded state, the bottom wall peripheral side of the cam can support the outer bottom wall of the slot, thereby improving the stability of the frame 100 in the unfolded state.

[0067] Furthermore, in the unfolded state, the first connecting rod 21 and the second connecting rod 22 can also be configured to be extended in the lateral direction as a whole. At this time, the first connecting rod 21 and the second connecting rod 22 can also play a role in supporting the front bracket 13 and the rear bracket 12, thereby improving the stability of the frame 100 in the unfolded state.

[0068] Therefore, in one embodiment, the bracket assembly 1 has a folded state and an unfolded state. In the unfolded state, the two connecting rods are extended in the same direction, and at least one of the connecting rods is extended in a direction substantially parallel to the transverse direction as a whole.

[0069] In this embodiment, in the deployed state, the first connecting rod 21 and the second connecting rod 22 extend horizontally as a whole, so that the two connecting rods, the front bracket 13 and the rear bracket 12 can form a triangle, and the triangle has stability, thereby improving the stability of the frame 100 in the deployed state.

[0070] It can be understood that during the rotation of the push rod 11, the whole rotates circumferentially around the connection point with the mounting bracket 3. When the extension direction of the line connecting the two connection points, namely the connection point of the push rod 11 and the mounting bracket 3 and the connection point of the push rod 11 and the push rod link 23, is inconsistent with the extension direction of the push rod 11, that is, when a Figure 2 midpoint B is used to draw an auxiliary line along the extension direction of the push rod 11, and the connection point of the push rod 11 and the push rod link 23 falls outside the auxiliary line, at this time, the driving stability of the push rod 11 on the push rod link 23 is relatively low.

[0071] Therefore, in order to improve the stability of the push rod 11 on the push rod link 23, the extension direction of the line connecting the two connection points, namely the connection point of the push rod 11 and the mounting bracket 3 and the connection point of the push rod 11 and the push rod link 23, is kept consistent with the extension direction of the push rod 11, thereby improving the driving stability of the push rod 11 on the push rod link 23.

[0072] In addition, in order to carry the object placed on the trolley, the frame 100 further includes a seat post 4. The seat post 4 is installed on the bracket assembly 1 and can carry the object placed on the trolley. Specifically, the seat post 4 can directly carry the object, or a seat cushion, a seat cover, etc. can be placed on the seat post 4, so that when the trolley is a baby carriage or an infant stroller, it can be used for children or infants to sit.

[0073] Specifically, the seat post 4 can be fixedly installed on the mounting bracket 3 or rotatably installed on the mounting bracket 3, which is not limited herein. The seat post 4 can be foldable and retractable or non-foldable and non-retractable.

[0074] The seat post 4 is rotatably installed on the bracket assembly 1 in a direction close to or away from the rear bracket 12. During the folding and retracting process, the user can operate the seat post 4 alone to achieve the folding and retracting of the seat post 4, or through the linkage of the linkage assembly 2, etc., which is not limited herein.

[0075] In a further embodiment, the frame 100 further includes a linkage rod 41. Two ends of the linkage rod 41 are respectively and movably connected to the linkage assembly 2 and the seat rod 4, so as to drive the seat rod 4 to move closer to the front bracket 13 through the linkage rod 41 when the linkage assembly 2 is folded.

[0076] Specifically, the linkage rod 41 is movably connected to at least one of the connecting rods. Please refer to Figure 2 , point G is the connection point of the linkage rod 41 and the connecting rod, point H is the connection point of the linkage rod 41 and the seat rod 4, and point is the rotational connection point of the seat rod 4 and the mounting bracket 3. During the folding process, the push rod 11 rotates downward, drives the push rod linkage 23 to rotate downward together through point A, and the push rod linkage 23 drives the first connecting rod 21 to rotate downward through point D. At this time, the connection point G of the first connecting rod 21 and the second connecting rod 22 also rotates downward, pulling the second connecting rod 22 to rotate in the direction close to the first connecting rod 21. When point G rotates downward, the linkage rod 41 also moves downward, pulling point H to rotate downward, thereby realizing the folding and storage of the seat rod 4.

[0077] In the technical solution of this embodiment, by rotatably mounting the seat rod 4 on the bracket assembly 1, it can rotate in the direction close to or away from the front bracket 13, and by providing the linkage rod 41, the linkage rod 41 is respectively connected to the connecting rod and the seat rod 4. Thus, during the rotation of the push rod 11, not only can the front bracket 13 and the rear bracket 12 approach each other, but also the seat rod 4 can approach the rear bracket 12, realizing the folding and storage of the seat rod 4. During the whole process, the user does not need to operate the seat rod 4, improving the user experience.

[0078] Meanwhile, in order to improve the stability of the stroller when supporting the baby during riding, the frame 100 further has a backrest rotatably connected to the seat rod 4. The connection point of the linkage rod 41 and the seat rod 4 and the connection point of the backrest and the seat rod 4 are respectively located on both sides of the rotational connection point of the seat rod 4 and the bracket assembly 1.

[0079] In the solution of this embodiment, by providing the backrest, the back of the baby sitting in the stroller can be supported, thereby improving the stability of the stroller when supporting the baby during sitting. Moreover, the connection between the linkage rod 41 and the seat rod 4 and the connection between the backrest and the seat rod 4 are respectively located on both sides of the rotational connection between the seat rod 4 and the bracket assembly 1. As a result, during the folding process, the linkage rod 41 pulls one side of the seat rod 4 to rotate downward, while the lower end of the backrest on the other side will tilt upward, enabling the backrest to rotate towards the seat rod 4 under its own gravity to complete the folding of the backrest, making the overall volume of the frame 100 smaller in the folded state.

[0080] Specifically, the push rod 11 assembly includes two connecting rods rotatably arranged, and the two connecting rods are respectively rotatably connected to the front bracket 13 and the rear bracket 12; the linkage rod 41 is at least movably connected to one of the connecting rods; the connection position between the linkage rod 41 and the connecting rod can be any position on the connecting rod except the first end, Figure 2 taking the position between C and F as an example, the connection position between the linkage rod 41 and the connecting rod can be any position between C and F except points C and F, and no limitation is made here.

[0081] Considering that during the folding and storage process, the movement amount of point G in the longitudinal direction is the largest, therefore, when the connection position between the linkage rod 41 and the connecting rod is set at the position of point G, the largest movement amount can be brought to the linkage rod 41. After folding is completed, the seat rod 4 can be made closer to the front bracket 13 to reduce the volume of the frame 100 after folding.

[0082] Therefore, in a further embodiment, the joint position between the linkage rod 41 and the connecting rod coincides with the joint position of the two connecting rods.

[0083] In the technical solution of this embodiment, by setting the connection position between the linkage rod 41 and the connecting rod at the rotational connection of the two connecting rods, compared with the solution of connecting to other positions, the movement stroke of the linkage rod 41 is larger, and the folding of the seat rod 4 is more complete.

[0084] In addition, it can be understood that during the folding process of the frame 100, the entire frame 100 is driven by the gravity of the push rod 11. During this process, if the projection of the center of gravity of the push rod 11 on the bottom surface of the frame 100 overlaps with the projection of the linkage assembly 2 on the bottom surface of the frame 100, at this time, the linkage assembly 2 will reversely support the push rod 11, and the push rod 11 may easily become stuck during rotation, so that the process of the frame 100 cannot proceed smoothly. Therefore, in order to allow the push rod 11 to rotate smoothly under the action of its own gravity, in one embodiment, the projection of the center of gravity of the push rod 11 on the bottom surface of the frame 100 is located outside the projection of the linkage assembly 2 on the bottom surface of the frame 100.

[0085] In the technical solution of this embodiment, the projection of the center of gravity of the push rod 11 on the bottom surface of the frame 100 is located outside the projection of the linkage assembly 2 on the bottom surface of the frame 100, so that a sufficient distance is maintained between the center of gravity of the push rod 11 and the linkage assembly 2, ensuring that when folding begins, the push rod 11 can rotate downward under the action of its own gravity to fold.

[0086] Considering that the length of the push rod 11 of the existing stroller is generally longer than the length of the rear bracket 12, therefore, when the length of the push rod 11 cannot be changed, after folding, when the angle between the push rod 11 and the rear bracket 12 is relatively small, the push rod 11 will protrude a long portion of the rear bracket 12, and when the push rod 11 is not to protrude from the rear bracket 12, the angle between the push rod 11 and the rear bracket 12 is large, resulting in a larger overall volume of the folded frame 100.

[0087] Therefore, in order to reduce the volume of the space occupied by the frame 100 after being folded, the push rod 11 includes a first push rod segment 42 and a second push rod segment 43 sequentially arranged along its length direction, and the first push rod segment 42 and the second push rod segment 43 are rotatably connected.

[0088] In the technical solution of this embodiment, the push rod 11 is divided into a first push rod segment 42 and a second push rod segment 43 along its length direction, so that during the folding process, the first push rod segment 42 can be rotated in a direction close to the second push rod segment 43, thereby changing the overall length of the push rod 11 and shortening the length of the push rod 11, thereby making the volume of the frame 100 smaller after folding.

[0089] It should be emphasized that the specific implementation form of the push rod 11 is not limited. It can be a movable rod. The part of the movable rod away from the rear bracket 12 is the first push rod section 42, and the part where the movable rod is rotatably connected to the rear bracket 12 is the second push rod section 43. The push rod 11 can also be a combination of multiple rods. Please refer to Figure 1 and Figure 4 , the push rod 11 includes a top rod 19 and two vertical rods 20. Both ends of the top rod 19 extend towards the rear bracket 12 to form two extension sections. The two vertical rods 20 are rotatably connected to the two extension sections. The top rod 19 constitutes the first push rod section 42, and the two vertical rods 20 constitute the second push rod section 43.

[0090] It should be noted that the first push rod section 42 and the second push rod section 43 can be in a state where they can always rotate, or the rotation can be restricted by setting an unlocking component and a first locking member. Only when the user needs them to be able to rotate can they rotate. This is not limited here. Considering the state of always being able to rotate, when the vehicle frame 100 is in the unfolded state, it is inconvenient for the user to operate the push rod 11. Therefore, in an embodiment, the vehicle frame 100 assembly further includes an unlocking component and a first locking member. The first locking member is movably arranged at the rotational connection of the first push rod section 42 and the second push rod section 43, and the first locking member has a locking position and an unlocking position in its moving stroke. When the first locking member is in the locking position, the first push rod section 42 and the second push rod section 43 are locked so that relative rotation between them cannot occur, facilitating the user to push the stroller. When the first locking member is in the unlocking position, the first locking member releases the locking of the first push rod section 42 and the second push rod section 43, allowing the first push rod section 42 and the second push rod section 43 to rotate relative to each other. At this time, the first push rod section 42 rotates in the direction close to the second push rod section 43 under its own gravity or under the operation of the user, reducing the overall length of the push rod 11. When folding, the angle between the push rod 11 and the rear bracket 12 can become relatively small, or the push rod 11 does not protrude too much from the rear bracket 12 when folding, not occupying too much space.

[0091] It can be understood that the frame 100 has an unfolded state and a folded state. In the unfolded state, the push rod 11, the front bracket 13 and the rear bracket 12 cannot rotate relative to each other, which is convenient for users to place items or for smaller children to ride. In the folded state, the push rod 11, the front bracket 13 and the rear bracket 12 can rotate relative to each other, so as to reduce the overall size of the frame 100, reduce its volume and facilitate storage by users.

[0092] Therefore, in order to maintain the stability of the frame 100 in the unfolded state, the frame 100 further includes a second locking member for locking the push rod 11 and / or the front bracket 13 and / or the rear bracket 12, so as to lock the push rod 11 and / or the front bracket 13 and / or the rear bracket 12 through the second locking member, enabling the frame 100 to switch between the unfolded state and the folded state.

[0093] Specifically, the implementation forms of the first locking member and the second locking member are not limited. It can be in the form of a convex and a hole, such as a convex movably arranged towards the hole. When the frame 100 is in the unfolded state, the convex is located in the hole to achieve locking and positioning. When folding and storing is required, the unlocking assembly pulls the convex out of the hole to release the lock, enabling the first push rod section 42 and / or the second push rod section 43 to rotate for folding and storing. It can also be a combination of a hook and a convex, etc., which is not limited here. The specific implementation form of the unlocking assembly is not limited. It can be in the form of a button. For example, the button is connected to the convex through a pull rope. After the button is pressed, the convex is pulled through the pull rope to separate the convex from the hole. It can also be in the form of a lifting handle, and the lifting handle is connected to the convex through a connecting rope, etc., which is not limited here.

[0094] It should be emphasized that the unlocking of the first locking member and the second locking member can be carried out by the same unlocking assembly. For example, an unlocking assembly is connected to the first locking member and the second locking member through a connecting rope at the same time, so that operating one unlocking assembly can unlock the first locking member and the second locking member simultaneously, which is convenient for users. Of course, two unlocking assemblies can also be provided separately to unlock the first locking member and the second locking member respectively, which is not limited here.

[0095] In one embodiment, the unlocking assembly is used to unlock the first locking member, and the first push rod segment 42 is connected to the second locking member so that the second locking member can be unlocked when the first push rod segment 42 rotates. During the actual folding process, the user uses the unlocking assembly to unlock the first locking member, thereby enabling the first push rod segment 42 to rotate relative to the second push rod segment 43, and then rotates the first push rod segment 42 to fold the push rod 11, thereby changing the length of the push rod 11. During the rotation of the first push rod segment 42, the second locking member is unlocked, allowing the second push rod segment 43 to rotate in a direction close to the rear bracket 12, and the frame 100 is folded.

[0096] Compared with the solution of setting up one locking assembly to unlock the first locking member and the second locking member at the same time, it can prevent the second push rod segment 43 from rotating when the push rod 11 starts to be folded, thereby improving the folding stability of the first push rod segment 42. Compared with the solution of setting up two unlocking assemblies, only one locking assembly needs to be unlocked, which is simple for users to operate.

[0097] The utility model also proposes a cart, which includes a frame 100. The specific structure of the frame 100 refers to the above-mentioned embodiments. Since the cart adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Among them, the frame includes a support assembly 1 and a linkage assembly 2. The frame 100 includes the support assembly 1 and the linkage assembly 2. The support assembly 1 includes a push rod 11, a front support 13 and a rear support 12 that rotate relative to the push rod 11. Two of the three components of the front support 13, the rear support 12 and the push rod 11 are rotationally connected, and the third component is rotationally connected to at least one of the above-mentioned two components; the linkage assembly 2 includes a connecting rod assembly and a push rod connecting rod 23 that are rotationally engaged with the front support 13 and the rear support 12 respectively, and the connecting rod assembly can be folded to bring the front support 13 and the rear support 12 closer; the push rod connecting rod 2 One end of the push rod 3 is movably connected to the push rod 11, and the other end of the push rod connecting rod 23 is movably connected to the connecting rod assembly; when the push rod 11 moves toward the rear bracket 12, the push rod connecting rod 23 drives the connecting rod assembly to fold; the push rod 11 has a first end and a second end arranged opposite to each other along its extension direction, the first end of the push rod is rotatably connected to the front bracket 13 and / or the rear bracket 12, and the engaging position of the push rod connecting rod 23 and the push rod 11 is closer to the first end of the push rod than the second end of the push rod, so that the push rod 11 can move toward the rear bracket 12 under the action of its own gravity and drive the push rod connecting rod 23 to move.

[0098] The technical solution of the present utility model is to connect the push rod 11, the front bracket 13 and the rear bracket 12 by setting the linkage assembly 2. When the user needs to store and fold the vehicle frame 100, since the engagement position of the push rod link 23 and the push rod 11 is closer to the first end of the push rod than the second end of the push rod, therefore, the push rod 11 can move closer to the rear bracket 12 under its own gravity. At the same time, it can drive the push rod link 23 to move, so as to drive the folding of the link assembly. Under the folding of the link assembly, the front bracket 13 and the rear bracket 12 move closer to each other, realizing the folding of the entire vehicle frame 100. During the entire folding process, the push rod 11 can complete the folding of the entire vehicle frame 100 relying on its own gravity, without the need for the user to perform additional operations, improving the simplicity of the existing folding process of the stroller.

[0099] Specifically, the stroller can be a baby stroller, an infant stroller, or a shopping cart, which is not limited herein. In one embodiment, the stroller is a baby stroller.

[0100] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A frame, characterized in that: include: A bracket assembly includes a push rod, a front bracket and a rear bracket that rotate relative to the push rod, two of the three components of the front bracket, the rear bracket and the push rod are rotatably connected, and the third component is rotatably connected to at least one of the two components; and, A linkage assembly, the linkage assembly comprising a connecting rod assembly and a push rod connecting rod respectively rotatably engaged with the front bracket and the rear bracket, the connecting rod assembly can be folded to bring the front bracket and the rear bracket closer; one end of the push rod connecting rod is movably connected to the push rod, and the other end of the push rod connecting rod is movably connected to the connecting rod assembly; when the push rod moves closer to the rear bracket, the push rod connecting rod drives the connecting rod assembly to fold; The push rod has a first end and a second end arranged opposite to each other along its extension direction, the first end of the push rod is rotatably connected to the front bracket and / or the rear bracket, and the engaging position of the push rod connecting rod and the push rod is closer to the first end of the push rod than the second end of the push rod, so that the push rod can move toward the rear bracket under the action of its own gravity and drive the push rod connecting rod to move.

2. The frame according to claim 1, characterized in that The push rod assembly includes two rotatably arranged connecting rods, and the two connecting rods are rotatably connected to the front bracket and the rear bracket respectively; The push rod connecting rod is movably connected to one of the connecting rods, so that when the push rod moves toward the rear bracket under the action of its own gravity, the push rod connecting rod drives the two connecting rods to move closer and fold.

3. The frame according to claim 2, characterized in that: The two connecting rods include a first connecting rod connected to the front bracket and a second connecting rod connected to the rear bracket; The push rod connecting rod is movably connected to the first connecting rod; Compared with the second connecting rod, the engaging position of the push rod link and the first connecting rod is located at a position on the first connecting rod that is closer to the rear bracket.

4. The frame according to claim 2 or 3, characterized in that: The connecting rod has a first side and a second side which are arranged opposite to each other along the width direction thereof, wherein the first side of the connecting rod is arranged toward the joint of the three components, and the second side of the connecting rod is facing away from the joint of the three components; The combined position of the push rod connecting rod and the connecting rod is closer to the first side of the connecting rod than to the second side of the connecting rod.

5. The frame according to claim 4, characterized in that: A mounting portion is formed on a first side of the connecting rod and protrudes outwardly, and the push rod connecting rod is movably connected to the mounting portion.

6. The frame according to claim 2, characterized in that: The bracket assembly has a folded state and an unfolded state. In the unfolded state, the two connecting rods are extended in the same direction, and at least one of the connecting rods is extended in a direction substantially parallel to the transverse direction as a whole.

7. The frame according to claim 1, characterized in that: The frame further comprises a seat rod and a linkage rod, wherein the seat rod is rotatably mounted on the bracket assembly; The two ends of the linkage rod are movably connected to the linkage assembly and the seat rod respectively, so that when the linkage assembly is folded, the seat rod is driven by the linkage rod to move closer to the front bracket; The frame also has a backrest rotatably connected to the seat rod, and the connection between the linkage rod and the seat rod and the connection between the backrest and the seat rod are respectively arranged on both sides of the rotation connection between the seat rod and the bracket assembly.

8. The frame according to claim 7, characterized in that: The push rod assembly includes two rotatably arranged connecting rods, and the two connecting rods are rotatably connected to the front bracket and the rear bracket respectively; The linkage rod is movably connected to at least one of the connecting rods; The engaging position of the linkage rod and the connecting rod coincides with the engaging position of the two connecting rods.

9. The frame according to claim 1, characterized in that: The projection of the center of gravity of the push rod on the bottom surface of the frame is located outside the projection of the linkage assembly on the bottom surface of the frame.

10. A cart, characterized in that: Comprising a frame as claimed in any one of claims 1 to 9.

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