stroller

Abstract

The utility model discloses a kind of carts, including collapsible chassis, and with the chassis movable connection's push rod frame, the chassis includes upper rotationally connected front support and rear support, and the support rod group can be supported between the front support and the rear support in front-back direction, when the chassis is folded, the front support and the rear support are mutually folded in front-back direction, the support rod group is folded between the front support and the rear support, wherein, the push rod frame and the support rod group are linked to set, to when the push rod frame is folded relative to the chassis, drive the support rod group movement to make the chassis fold. The structure of the cart is simple, and each rod on the cart after folding can be tightly folded together, and the structure is very flat and compact.

Description

Technical Field

[0001] This utility model relates to a trolley, specifically a foldable trolley. Background Technology

[0002] In existing technologies, strollers typically have a foldable frame to reduce space occupation when folded up for daily carrying or when not in use. However, the structures of strollers on the market vary widely, with different folding principles and operation methods. Simplifying the structure of strollers as much as possible while ensuring their load-bearing capacity, and making their folded size as small, compact, and easy to operate as possible, has always been a goal pursued by those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide a new foldable trolley with a novel structure and folding principle.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a trolley having an unfolded state and a folded state, the trolley including a foldable base frame and a push rod frame movably connected to the base frame, the base frame including a front support and a rear support rotatably connected at the upper part, and a support rod assembly capable of supporting the front support and the rear support in the front-rear direction, when the base frame is folded, the front support and the rear support retract towards each other in the front-rear direction, and the support rod assembly retracts between the front support and the rear support, wherein the push rod frame and the support rod assembly are linked together so that when the push rod frame retracts relative to the base frame, it drives the support rod assembly to move, thereby causing the base frame to fold.

[0005] Preferably, the support rod assembly includes a first support rod and a second support rod rotatably connected to each other. The front part of the first support rod is rotatably connected to the front bracket, and the rear part of the second support rod is rotatably connected to the rear bracket. When the trolley is folded, the rear part of the first support rod and the front part of the second support rod move upward, causing the first support rod and the second support rod to fold in the front-rear direction and drive the front bracket and the rear bracket to close.

[0006] In some embodiments, the lower part of the push rod frame is rotatably connected to the rear support about a first axis. The trolley also includes a linkage between the push rod frame and the second support rod. When the push rod frame flips and retracts relative to the rear support, the linkage drives the second support rod to flip relative to the rear support, causing the support rod assembly to fold in the front-back direction.

[0007] In some embodiments, the linkage is rotatably connected to the lower part of the push rod frame about a second axis, and the linkage is also slidably connected to the second support rod along the length direction of the second support rod, wherein the second axis is parallel to the first axis and the second axis is located below the first axis.

[0008] In some embodiments, the push rod holder includes a push rod body and an extension disposed on the push rod body. The lower part of the push rod body is rotatably connected to the rear bracket about the first axis. The extension is fixedly disposed relative to the push rod body. The lower part of the extension extends below the first axis. The linkage is rotatably connected to the lower part of the extension about the second axis.

[0009] In some embodiments, the rear support includes a rear support body and a connecting seat fixed to the upper part of the rear support body and extending obliquely upward and backward; the push rod bracket further includes an adapter seat, the lower part of the push rod body and the adapter seat are rotatably connected to the connecting seat around the first axis, wherein the adapter seat is provided with a mounting hole, and the extension is fitted into the mounting hole; in the unfolded state, the push rod body and the connecting seat extend in the same direction.

[0010] In some embodiments, the push rod frame is movably connected to the rear support. When the trolley is in an unfolded state, the first support rod and the second support rod unfold relative to each other and support each other in the front and rear directions between the front and rear supports. A seating device is formed between the support rod assembly and the push rod frame.

[0011] In some embodiments, the trolley further includes a backrest frame, the lower part of which is rotatably connected to the rear support or rotatably connected to the push rod frame; or, the lower part of the backrest frame and the lower part of the push rod frame are rotatably connected to the rear support about the same rotation center line; or, the lower part of the backrest frame is rotatably connected to the support rod assembly.

[0012] Preferably, the trolley further includes a side frame movably connected between the base frame and the push rod frame, wherein the side frame and the base frame retract in conjunction when the push rod frame is retracted relative to the base frame.

[0013] In some embodiments, one end of the side frame is rotatably connected to at least one of the upper part of the front support and the upper part of the rear support, and the other end of the side frame is rotatably connected to a slider, which is slidably disposed on the push rod frame along the length direction of the push rod frame. When the trolley is in a folded state, the side frame is folded up to the rear side of the rear support.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The trolley provided by this utility model, when the push rod frame is retracted relative to the base frame, can drive the support rod assembly to move, thereby causing the front and rear supports to retract in the front-to-back direction, thus folding the base frame and achieving the folding of the trolley. The trolley has a simple structure; after folding, all the rods on the trolley can be tightly retracted together, resulting in a very flat and compact structure. During the folding process, operation basically only requires driving the push rod frame to rotate to achieve the folding of the trolley, making operation very convenient. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of a trolley in an unfolded state according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 Enlarged diagram of section A in the middle;

[0018] Figure 3 for Figure 1 A side view of the trolley's structure;

[0019] Figure 4 for Figure 1 A three-dimensional structural diagram of the folding process of the stroller;

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of section B in the middle;

[0021] Figure 6 for Figure 4 A side view of the trolley's structure;

[0022] Figure 7 for Figure 1 A three-dimensional structural diagram of the trolley in its folded state;

[0023] Figure 8 for Figure 7 A side view of the trolley's structure;

[0024] In the attached diagrams above:

[0025] 1. Front bracket; 11. Front strut; 10. Front wheel assembly;

[0026] 2. Rear bracket; 21. Rear support rod; 22. Connecting seat; 23. Rear crossbar; 20. Rear wheel assembly;

[0027] 3. Support rod assembly; 31. First support rod; 32. Second support rod; 33. Crossbar;

[0028] 4. Push rod bracket; 41. Push rod body; 42. Extension section; 43. Adapter seat; 5. Linkage component;

[0029] 6. Side frame; 61. Side rod; 7. Sliding component; 8. Backrest frame; 81. Backrest rod; 9. Push handle bracket;

[0030] X1, First axis line; X2, Second axis line; X3, Third axis line; X4, Fourth axis line; X5, Fifth axis line; X6, Sixth axis line. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to 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 for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, 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.

[0032] In this document, the terms "up," "down," "left," "right," "front," and "back" indicate the orientation based on the orientation observed by the person pushing the cart while it is in its unfolded state, standing on one side of the cart and facing it. They are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Figures 1 to 8 The diagrams are drawn to scale. To keep the instructions concise, the proportions of each component are not listed individually. However, the proportions and positions of each component should be considered part of the contents of this instruction manual.

[0034] See Figures 1 to 8The illustrated trolley has an unfolded state and a folded state. The trolley includes a foldable base frame and a push rod frame 4 movably connected to the base frame. The base frame includes a front support 1 and a rear support 2 rotatably connected at their upper parts. A front wheel assembly 10 is located at the bottom of the front support 1, and a rear wheel assembly 20 is located at the bottom of the rear support 2. The base frame also includes a support rod assembly 3 that supports the front support 1 and the rear support 2 in a front-to-back direction. When the base frame is folded, the front support 1 and the rear support 2 retract towards each other in a front-to-back direction, and the support rod assembly 3 retracts between the front support 1 and the rear support 2. In this trolley, the push rod frame 4 and the support rod assembly 3 are linked, so that when the push rod frame 4 retracts relative to the base frame, it drives the support rod assembly 3 to move, thereby folding the base frame. Thus, when folding the trolley, only the push rod frame 4 needs to be moved relative to the base frame to retract, which drives the base frame to fold, achieving the overall folding of the trolley. The folding operation is very simple and convenient.

[0035] Specifically, the support rod assembly 3 includes a first support rod 31 and a second support rod 32 that are rotatably connected to each other. The front part of the first support rod 31 is rotatably connected to the front support 1, and the rear part of the second support rod 32 is rotatably connected to the rear support 2. When the trolley is folded, the rear part of the first support rod 31 and the front part of the second support rod 32 move upward, causing the first support rod 31 and the second support rod 32 to flip relative to each other and fold in the front-back direction, and causing the front support 1 and the rear support 2 to rotate and fold together.

[0036] In this embodiment, the lower part of the push rod frame 4 is rotatably connected to the rear support 2 around the first axis X1. The trolley also includes a linkage 5 disposed between the push rod frame 4 and the second support rod 32. When the push rod frame 4 flips backward relative to the rear support 2, the linkage 5 causes the second support rod 32 to flip relative to the rear support 2, thereby causing the support rod assembly 3 to flip and fold, and further driving the front support 1 and the rear support 2 to retract in the front-rear direction.

[0037] Specifically, the linkage 5 is rotatably connected to the lower part of the push rod frame 4 around the second axis X2. The linkage 5 can also slide along the length of the second support rod 32 and is connected to the second support rod 32. The second axis X2 is parallel to the first axis X1, and the second axis X2 is located below the first axis X1. Thus, when the push rod frame 4 flips backward relative to the rear support 2 around the first axis X1, the position on the push rod frame 4 connected to the linkage 5 moves upward, the linkage 5 swings relative to the push rod frame 4 and slides along the second support rod 32, thereby driving the second support rod 32 to flip backward and upward toward the rear support 2; further causing the rear part of the first support rod 31 to move upward, the first support rod 31 to rotate relative to the front support 1, so that the first support rod 31 and the second support rod 32 flip and fold relative to each other in the front-back direction. In the above process, the front support 1 and the rear support 2 rotate relative to each other and gradually fold together in the front-back direction.

[0038] See Figures 1 to 6 As shown, in this embodiment, the push rod frame 4 includes a push rod body 41 and an extension 42 disposed on the push rod body 41. The lower part of the push rod body 41 is rotatably connected to the rear support 2 around the first axis X1. The extension 42 is fixedly disposed relative to the push rod body 41. The lower part of the extension 42 extends to below the first axis X1. The linkage 5 is rotatably connected to the lower part of the extension 42 around the second axis X2. In this way, when the push rod body 41 is connected to the rear support 2 at a higher position, it can also be connected to the linkage 5 at a lower position by extending downward by adding the extension 42. This can effectively utilize the space on the trolley and avoid the structure being too long and not simple enough.

[0039] In this embodiment, the push rod holder 4 also includes an adapter seat 43. The lower part of the push rod body 41 and the adapter seat 43 are rotatably connected to the rear support 2 around the first axis X1. The adapter seat 43 is also provided with a mounting hole. The extension 42 is inserted into the mounting hole along the length direction. The extension 42 can be fixedly connected to the push rod body 41 or rotatably connected to the push rod body 41. Under the action of the mounting hole on the adapter seat 43, the extension 42 and the push rod body 41 remain fixed to each other and rotate synchronously with the adapter seat 43 during the rotation of the push rod body 41 relative to the rear support 2. This makes the overall structure of the push rod holder 4 simpler to manufacture and form, and can reduce costs.

[0040] In this embodiment, with the trolley in its unfolded state, the first support rod 31 and the second support rod 32 unfold relative to each other and support each other between the front bracket 1 and the rear bracket 2 in the front-rear direction. The second support rod 32 is in a state of gradually upward tilting from back to front. In this way, when the push rod frame 4 flips and folds back relative to the rear bracket 2, it is easier for the rear part of the first support rod 31 and the front part of the second support rod 32 to move upward, thereby facilitating the smooth folding of the trolley. Here, the support rod assembly 3 is used as a seat frame. The first support rod 31 extends backward and slightly downward, mainly providing sitting support. A seat device is formed between the support rod assembly 3 and the push rod frame 4 for providing seating for passengers.

[0041] The trolley also includes a backrest frame 8, the lower part of which is rotatably connected to the rear support 2 or rotatably connected to the push rod frame 4; alternatively, the lower part of the backrest frame 8 and the lower part of the push rod frame 4 are rotatably connected to the rear support 2 around the same axis; or the lower part of the backrest frame 8 is rotatably connected to the support rod assembly 3. In the unfolded state, the backrest frame 8 is located entirely behind the support rod assembly 3, providing back support for the occupant when seated on the support rod assembly 3. In this embodiment, the lower part of the backrest frame 8 and the lower part of the push rod frame 4 are rotatably connected to the rear support 2 around a second axis X2, and can rotate together relative to the rear support 2 to change states.

[0042] Referring to the accompanying drawings, the trolley in this embodiment also includes a side frame 6 movably connected between the base frame and the push rod frame 4. When the trolley is in the unfolded state, the side frame 6 can form protection on both sides of the seating device. When the push rod frame 4 is retracted relative to the base frame, the side frame 6 is retracted in conjunction with the base frame. Specifically, one end of the side frame 6 is rotatably connected to the upper part of the front support 1 and the upper part of the rear support 2, and the other end of the side frame 6 is rotatably connected to a sliding member 7. The sliding member 7 is slidably disposed on the push rod frame 4 along the length direction of the push rod frame 4. During the process of the push rod frame 4 flipping backward relative to the rear support 2, the sliding member 7 slides along the push rod frame 4 and drives the side frame 6 to retract toward the rear side of the rear support 2.

[0043] In this embodiment of the trolley, the components are arranged as follows:

[0044] See Figure 1 , Figure 2 As shown, the front support 1 includes two sets of front support rods 11 located on the left and right sides and extending vertically, with a front wheel assembly 10 at the bottom of each set of front support rods 11. The rear support 2 includes a rear support body extending vertically and a connecting seat 22 fixed to the upper part of the rear support body and extending obliquely upwards and backwards. Here, the rear support body includes two sets of rear support rods 21 located on the left and right sides and extending vertically, and a rear crossbar 23 fixed between the lower parts of the two sets of rear support rods 21 and extending horizontally. A rear wheel assembly 20 is provided at the bottom of each set of rear support rods 21, and a connecting seat 22 is provided at the upper part of each set of rear support rods 21. When the trolley is in the unfolded state, there is a certain distance between the connecting seat 22 and the top of the rear support rod 21, and the connecting seat 22 extends obliquely upwards and backwards from the rear support rod 21.

[0045] The push rod body 41 of the push rod frame 4 is rod-shaped and has two sets on the left and right sides respectively; correspondingly, the extension 42 and the adapter 43 also have two sets on the left and right sides respectively; the first support rod 31 has two sets on the left and right sides respectively, and several crossbars 33 are fixed between the first support rods 31 on both sides, and the first support rods 31 on both sides and the several crossbars 33 together provide sitting support; the second support rod 32 and the linkage 5 also have two sets on the left and right sides respectively. The side frame 6 includes two side rods 61 on the left and right sides respectively, and each side rod 61 is rotatably connected to a sliding member 7 at its upper part. The sliding member 7 is specifically a sliding sleeve, which is slidably sleeved on the push rod body 41 on the side. The backrest frame 8 is a U-shaped frame with the opening facing downwards, and has two backrest rods 81 on the left and right sides respectively.

[0046] On the left and right sides of the trolley, the upper part of the front support rod 11, the upper part of the rear support rod 21, and the lower part of the side rod 61 are rotatably connected around the third axis X3. The front part of the first support rod 31 is rotatably connected to the front support rod 11 around the fourth axis X4. The rear part of the first support rod 31 is rotatably connected to the front part of the second support rod 32 around the fifth axis X5. The rear part of the second support rod 32 is rotatably connected to the rear support rod 21 around the sixth axis X6.

[0047] The lower part of the push rod body 41, the adapter seat 43, and the lower part of the backrest rod 81 are rotatably connected to the connecting seat 22 around the first axis X1. One end of the extension 42 is connected to the inner side of the push rod body 41, passes downward through the mounting hole on the adapter seat 43, and extends to the bottom of the adapter seat 43. The linkage 5 is slidably sleeved on the second support rod 32, and its upper part is rotatably connected to the lower part of the extension 42 around the second axis X2. When the trolley is in the unfolded state, the push rod body 41 and the connecting seat 22 extend in the same direction. In the left-right direction, the linkage 5 is located inside the connecting seat 22 and can be covered by the connecting seat 22. The structure is relatively simple when viewed from the side of the trolley.

[0048] The cart also includes a push handle frame 9, which is a U-shaped frame with the opening facing downwards. The lower parts of the push handles on both sides are rotatably connected to the upper part of the corresponding push rod body 41.

[0049] See Figure 1 , Figure 3 As shown, in the unfolded state of this embodiment, the front support 1 and the rear support 2 unfold relative to each other in the front-rear direction and are supported on the ground by the front wheel assembly 10 and the rear wheel assembly 20. The first support rod 31 and the second support rod 32 unfold relative to each other and are supported between the front support 1 and the rear support 2 in the front-rear direction, providing support for the occupant to sit upright. The push rod frame 4 and the push handle frame 9 unfold relative to each other and extend gradually upward from front to back along the same length direction. The backrest frame 8 extends in the vertical direction and is located behind the support rod assembly 3, providing support for the occupant to lean against. The side frame 6 extends from front to back and connects between the top of the rear support 2 and the push rod frame 4, providing protection on both sides of the occupant's body. The overall appearance of the unfolded trolley is simple.

[0050] When the trolley needs to be folded up, first flip the push handle frame 9 relative to the push rod frame 4 to fold it up, as shown below. Figure 4 , Figure 6As shown; subsequently, the push handle frame 9 and the push rod frame 4 are driven to flip backward relative to the rear support 2. The extension 42 at the lower part of the push rod frame 4 swings and drives the linkage 5 to move upward, thereby driving the second support rod 32 to flip relative to the rear support 2. This causes the first support rod 31 and the second support rod 32 to flip relative to each other and fold in the front-back direction, and further causes the front support 1 and the rear support 2 to retract towards each other. During the process of the push rod frame 4 flipping backward, the sliding member 7 slides along the push rod body 41, causing the side frame 6 to gradually retract towards the rear of the rear support 2.

[0051] The stroller is in a folded state, such as Figure 7 , Figure 8 As shown, the front support 1, rear support 2, side frame 6, push rod frame 4 and push handle frame 9 are folded together in the front-to-back direction. The support rod group 3 is folded between the front support 1 and the rear support 2. All the rods on the trolley are tightly folded together, and the structure is very flat and compact. During the folding process, the operation basically only requires driving the push rod frame 4 to flip to achieve the folding of the trolley, which is very convenient.

[0052] In the folding process of this embodiment, since the push rod frame 4 is basically suspended behind the rear support 2, under its own weight and the additional weight of the push handle frame 9, the push rod frame 4 can automatically flip backward relative to the rear support 2, and in conjunction with it, the rods on the trolley rotate relative to each other to achieve automatic folding or assisted folding of the trolley. This simplifies the folding steps of the trolley, and the entire folding operation of the trolley can be completed with one hand, bringing convenience to the user's daily use.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

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

[0055] As indicated in this specification and claims, the terms "comprising" and "including" 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 apparatus may also include other steps or elements.

[0056] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

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

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A trolley having an unfolded state and a folded state, characterized in that: The trolley includes a foldable base frame and a push rod frame movably connected to the base frame. The base frame includes a front support and a rear support rotatably connected at the top, and a support rod assembly that can support the front support and the rear support in the front-rear direction. When the base frame is folded, the front support and the rear support retract towards each other in the front-rear direction, and the support rod assembly retracts between the front support and the rear support. The push rod frame and the support rod assembly are linked together so that when the push rod frame retracts relative to the base frame, it drives the support rod assembly to move, thereby causing the base frame to fold.

2. The trolley according to claim 1, characterized in that: The support rod assembly includes a first support rod and a second support rod that are rotatably connected to each other. The front part of the first support rod is rotatably connected to the front bracket, and the rear part of the second support rod is rotatably connected to the rear bracket. When the trolley is folded, the rear part of the first support rod and the front part of the second support rod move upward, causing the first support rod and the second support rod to fold in the front-back direction and drive the front bracket and the rear bracket to close.

3. The trolley according to claim 2, characterized in that: The lower part of the push rod frame is rotatably connected to the rear support about the first axis. The trolley also includes a linkage between the push rod frame and the second support rod. When the push rod frame flips and retracts relative to the rear support, the linkage drives the second support rod to flip relative to the rear support, causing the support rod assembly to fold in the front-back direction.

4. The trolley according to claim 3, characterized in that: The linkage is rotatably connected to the lower part of the push rod frame around the second axis. The linkage can also be slidably connected to the second support rod along the length direction of the second support rod. The second axis is parallel to the first axis and is located below the first axis.

5. The trolley according to claim 4, characterized in that: The push rod holder includes a push rod body and an extension disposed on the push rod body. The lower part of the push rod body is rotatably connected to the rear bracket around the first axis. The extension is fixedly disposed relative to the push rod body. The lower part of the extension extends below the first axis. The linkage is rotatably connected to the lower part of the extension around the second axis.

6. The trolley according to claim 5, characterized in that: The rear support includes a rear support body and a connecting seat fixed to the upper part of the rear support body and extending obliquely upward and backward; the push rod frame also includes an adapter seat, the lower part of the push rod body and the adapter seat are rotatably connected to the connecting seat around the first axis, wherein the adapter seat is provided with a mounting hole, and the extension is inserted into the mounting hole; in the unfolded state, the push rod body and the connecting seat extend in the same direction.

7. The trolley according to claim 2, characterized in that: The push rod frame is movably connected to the rear support. When the trolley is in the unfolded state, the first support rod and the second support rod unfold relative to each other and support each other in the front and rear directions between the front and rear supports. The support rod group and the push rod frame form a seating device.

8. The trolley according to claim 7, characterized in that: The trolley also includes a backrest frame, the lower part of which is rotatably connected to the rear support or rotatably connected to the push rod frame; or, the lower part of the backrest frame and the lower part of the push rod frame are rotatably connected to the rear support around the same rotation center line; or, the lower part of the backrest frame is rotatably connected to the support rod assembly.

9. The stroller according to any one of claims 1 to 8, characterized in that: The trolley also includes a side frame movably connected between the base frame and the push rod frame, wherein when the push rod frame is retracted relative to the base frame, the side frame and the base frame retract in conjunction.

10. The trolley according to claim 9, characterized in that: One end of the side frame is rotatably connected to at least one of the upper part of the front support and the upper part of the rear support. The other end of the side frame is rotatably connected to a sliding member. The sliding member is slidably disposed on the push rod frame along the length direction of the push rod frame. When the trolley is in a folded state, the side frame is folded up to the rear side of the rear support.

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