Folding cart

Abstract

The utility model relates to the technical field of trolleys, in particular to a folding trolley which comprises two vertical frames, a bottom frame and side frames. The bottom frame comprises two bottom frames of which one ends are hinged; the two side frames are arranged on the two sides of the vertical frame respectively. Each side frame comprises a second connecting rod and a first connecting rod of a V-shaped connecting rod structure. The first connecting rod comprises two first rod bodies of which one ends are hinged; the second connecting rod comprises a second rod body and a third rod body, one end of the second rod body is hinged to the bottom frame, the other end of the second rod body is arranged on the vertical frame to form a movable end, and the movable end can rotate relative to the vertical frame and can slide in the length direction of the vertical frame; one end of the third rod body is hinged to the end of the first rod body, and the other end is hinged to the middle of the second rod body; according to the scheme, the whole cart has good stability and is not prone to shaking in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of trolleys, in particular to a folding trolley. Background Art

[0002] In the related art, some folding trolleys are designed with a frameless structure, that is, the two sides of the trolley are designed with a basically frameless structure. For example, the simple hand-pulled folding trolley disclosed in the patent document with the application number 202222858521.3. However, there are still disadvantages in the use of such trolleys. The two sides mainly use a four-bar linkage mechanism to fix the trolley after it is unfolded. However, the four-bar structure is not stable enough, so that the stability of the trolley is poor when it is unfolded and used, and it is easy to shake when walking, so it needs to be improved. Summary of the Utility Model

[0003] In order to solve at least one technical problem mentioned in the background art, the purpose of the utility model is to provide a folding trolley.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] On the one hand, the utility model provides a folding trolley, including:

[0006] Two vertical frames, which are arranged oppositely and are both provided with rollers at the bottom;

[0007] A chassis, including two bottom frames hinged at one end, and the two ends of the two bottom frames away from each other are respectively hinged to the two vertical frames;

[0008] Two side frames, which are respectively arranged on both sides of the vertical frames; the side frame includes:

[0009] A first connecting rod, which has a V-shaped connecting rod structure and includes two first rod bodies hinged at one end, and the middle parts of the two first rod bodies are respectively hinged to the two bottom frames;

[0010] Two second connecting rods, which are respectively hinged to the two ends of the first connecting rod. The second connecting rod includes a second rod body and a third rod body. One end of the second rod body is hinged to the bottom frame, and the other end is arranged on the vertical frame to form a movable end. The movable end can rotate relative to the vertical frame and can slide along the length direction of the vertical frame; one end of the third rod body is hinged to the end of the first rod body, and the other end is hinged to the middle part of the second rod body.

[0011] As an optional implementation manner of the utility model, a sliding sleeve is hinged to one end of the second rod body close to the vertical frame, and the sliding sleeve is slidably arranged on the vertical frame along the length direction of the vertical frame.

[0012] As an optional implementation manner of the utility model, a convex part is further arranged on the vertical frame, and the convex part is arranged below the sliding sleeve for lower limit of the sliding sleeve.

[0013] As an alternative embodiment of the present utility model, one end of the two bottom frames close to each other is hinged through a hinge assembly. The hinge assembly includes two hinge heads. One end of the two hinge heads is hinged at the bottom, and the other ends are respectively fixed on the two bottom frames. When the folding cart is in the unfolded state, the hinged ends of the two hinge heads are in contact with each other.

[0014] On the other hand, the present utility model provides another folding cart, comprising:

[0015] Two vertical frames, which are arranged oppositely and are both provided with rollers at the bottom;

[0016] A chassis, comprising two bottom frames hinged at one end, and the other ends of the two bottom frames far from each other are respectively hinged to the two vertical frames;

[0017] Two side frames, which are respectively arranged on both sides of the vertical frame; the side frame includes:

[0018] A first connecting rod, which has a V-shaped connecting rod structure and includes two first rod bodies hinged at one end. The middle parts of the two first rod bodies are respectively hinged to the two bottom frames;

[0019] Two cross bars, which are respectively arranged at both ends of the first connecting rod. Among them, one end of the cross bar is hinged to the end of the first connecting rod, and the other end is hinged to the vertical frame.

[0020] As an alternative embodiment of the present utility model, one end of the two bottom frames close to each other is hinged through a hinge assembly. The hinge assembly includes two hinge heads. One end of the two hinge heads is hinged at the bottom, and the other ends are respectively fixed on the two bottom frames. When the folding cart is in the unfolded state, the hinged ends of the two hinge heads are in contact with each other.

[0021] Compared with the prior art, the advantages of adopting this solution are as follows:

[0022] In this solution, by setting the first connecting rod with a V-shaped structure to connect the two bottom frames, so that when the vehicle frame is in the unfolded state, the two first rod bodies constituting the first connecting rod will form a triangular support structure with the two bottom frames, so that a certain self-locking force is formed at the hinged part of the two bottom frames, restricting the upward flipping of the two bottom frames. Thus, when the cart is in the unfolded state, the two bottom frames are in a stable state, and further stably support the vertical frames on both sides, so that the whole cart has good stability and is not easy to shake during use. Description of the Drawings

[0023] Figure 1 It is a schematic structural view of the cart in the unfolded state in Embodiment 1;

[0024] Figure 2 It is the front view of Embodiment 1;

[0025] Figure 3 It is a schematic structural diagram of the trolley in the folding process in Embodiment 1;

[0026] Figure 4 It is a schematic structural diagram of the trolley in the fully folded state in Embodiment 1;

[0027] Figure 5 It is a schematic structural diagram of the trolley in the deployed state in Embodiment 2;

[0028] Figure 6 It is the front view of Embodiment 2. Detailed implementation manners

[0029] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0030] In the following description, terms such as "inside", "outside", "above", "below", "left", "right", etc., indicating orientation or positional relationship are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0031] Embodiment 1

[0032] Please refer to Figure 1-4 As shown, this embodiment provides a folding trolley, including a vertical frame 1, side frames 3, a bottom frame 2, etc. The following will specifically describe each component:

[0033] As Figure 1 shown, two vertical frames 1 are provided, and the two vertical frames 1 are arranged opposite to each other along the length direction of the trolley; and rollers 11 are provided at the bottom of each vertical frame 1. The number of rollers 11 can be selected according to actual needs. For example, in this embodiment, the case where two rollers 11 are provided at the bottom of each vertical frame 1 is shown.

[0034] Correspondingly, two side frames 3 are also provided, and the two side frames 3 are respectively arranged on both sides of the vertical frame 1. Specifically, the two side frames 3 are arranged opposite to each other along the width direction of the trolley.

[0035] It can be understood that in some embodiments, the structures of the two vertical frames 1 are basically the same, generally in the shape of a rectangular frame; the structures of the two side frames 3 are also basically the same, both being link mechanisms.

[0036] In addition, for ease of understanding, in this embodiment, the length direction of the cart is recorded as the first direction, and correspondingly, the width direction of the cart is recorded as the second direction.

[0037] The base frame 2 mainly serves as the bottom wall of the cart, and mainly includes two base frames 21 hinged at one end. In some embodiments, the two base frames 21 are basically rectangular frame structures; wherein the rotation axis of the hinge point of the two base frames 21 is parallel to the second direction, so that the two base frames 21 can be relatively flipped up and down around the hinge point to achieve folding or unfolding.

[0038] In some embodiments, in combination Figure 2 and Figure 3 As shown, the mutually hinged structure of the two bottom frames 21 is: the ends of the two bottom frames 21 that are close to each other are hinged to each other through a hinge assembly 4, and the hinge assembly 4 includes two hinge joints 41, and the bottoms of one end of the two hinge joints 41 are hinged to each other, and the other ends are respectively fixed on the two bottom frames 21, and the rotation axis of the mutual hinge point of the two hinge joints 41 is parallel to the second direction, so that the two bottom frames 21 can be flipped synchronously following the two hinge joints 41.

[0039] Since the hinge points of the two hinged joints 41 are located at their lower parts, when the folding cart is in the unfolded state, the hinged ends of the two hinged joints 41 will contact each other, thereby limiting the two hinged joints 41 from further flipping downward relative to each other, so that the two bottom frames 21 remain in a relatively unfolded state.

[0040] In some embodiments, when the two hinged joints 41 are in contact with each other (ie, the cart is in a fully unfolded state), an angle formed between the top surfaces of the two hinged joints 41 is between 170° and 180°.

[0041] In addition, the ends of the two bottom frames 21 that are away from each other are respectively hinged to the two vertical frames 1, that is, one bottom frame 21 is hinged to one vertical frame 1, and the other bottom frame 21 is hinged to the other vertical frame 1. The rotation axis of the mutual hinge point between the vertical frame 1 and the bottom frame 21 is parallel to the second direction.

[0042] Combination Figure 1 and Figure 2 As shown, the side frame 3 includes a first connecting rod 31 and two second connecting rods 32:

[0043] The first connecting rod 31 is a V-shaped connecting rod structure. Specifically, Figure 2 As shown, it comprises two first rod bodies 311 hinged at one end, and the two first rod bodies 311 together form a V-shaped connecting rod structure. The tip of the V-shaped first connecting rod 31 faces downward.

[0044] The middle parts of the two first rod bodies 311 are hinged to the two bottom frames 21 respectively. It can be understood that the middle part here can be understood as the position between the hinge points at both ends of the first connecting rod 31 .

[0045] Two second link rods 32 are respectively hinged to two ends of the two first link rods 31. Since the structures of the two second link rods 32 are basically the same, in this embodiment, one of them is taken as an example for specific description:

[0046] The second link rod 32 has a double-link structure, which includes a second rod body 321 and a third rod body 322. One end of the second rod body 321 is hinged to the bottom frame 21, and the other end is arranged on the vertical frame 1 to form a movable end.

[0047] The movable end is configured as follows: The movable end can rotate relative to the vertical frame 1 and can slide along the length direction of the vertical frame 1. Here, the length direction of the vertical frame 1 can also be understood as the height direction of the vertical frame 1.

[0048] One end of the third rod body 322 is hinged to the end of the first rod body 311, and the other end is hinged to the middle of the second rod body 321. Here, the middle can be understood as the position between the hinge points at both ends of the third link rod.

[0049] In the first link rod 31 and the second link rod 32, the rotation axes of each hinge point are all parallel to the second direction.

[0050] In some embodiments, in order to enable the movable end to rotate relative to the vertical frame 1 and slide along the length direction of the vertical frame 1, a sliding sleeve 323 is hinged to one end of the second rod body 321 close to the vertical frame 1. The rotation axis of the hinge point between the sliding sleeve 323 and the second rod body 321 is parallel to the second direction; the sliding sleeve 323 is slidably arranged on the vertical frame 1 along the length direction of the vertical frame 1. For example, the sliding sleeve 323 slidably sleeved on the side column of the vertical frame 1 can slide along the length direction of the column.

[0051] In order to limit the lower limit of the sliding sleeve 323, that is, to limit the maximum stroke position of the sliding sleeve 323 sliding down along the column, in this embodiment, a convex portion 12 is further provided on the vertical frame 1. The convex portion 12 is arranged below the sliding sleeve 323 to limit the lower limit of the sliding sleeve 323; that is, when the sliding sleeve 323 slides to the position of the convex portion 12, it will be blocked by the convex portion 12, thereby restricting the sliding sleeve 323 from continuing to slide down.

[0052] By setting the first link rod 31 with a V-shaped structure to connect the two bottom frames 21, in this way, when the vehicle frame is in the unfolded state, the two first rod bodies 311 constituting the first link rod 31 will form a triangular support structure with the two bottom frames 21, so that a certain self-locking force is formed at the hinge joint between the two bottom frames 21, restricting the upward flipping of the two bottom frames 21. Thus, when the trolley is in the unfolded state, the two bottom frames 21 are in a stable state, and further stably support the two side vertical frames 1, so that the entire trolley has good stability and is not easy to shake during use.

[0053] Embodiment 2

[0054] Combined Figure 5 and Figure 6 As shown, this embodiment provides another folding trolley, including a vertical frame 1, side frames 3, a bottom frame 2, etc. Specific descriptions of each component are as follows.

[0055] The difference between this embodiment and Embodiment 1 is that the structures of the side frames 3 of the two are different; the structures of the vertical frame 1, the bottom frame 2, etc. are basically the same, and the description of Embodiment 1 can be referred to.

[0056] In this embodiment, the two side frames 3 are respectively arranged on both sides of the vertical frame 1; the side frame 3 includes a first connecting rod 31 and two cross bars 33.

[0057] As Figure 5 and Figure 6 shown, the first connecting rod 31 has a V-shaped connecting rod structure, including two first rod bodies 311 hinged at one end. The first connecting rod 31 as a whole has a V-shaped connecting rod structure. Specifically, the first connecting rod 31 includes two first rod bodies 311 hinged at one end, and the two first rod bodies 311 together form a V-shaped connecting rod structure; the first connecting rod 31 with a V-shaped structure has its tip facing down; the middle parts of the two first rod bodies 311 are respectively hinged to the two bottom frames 21.

[0058] The two cross bars 33 are respectively arranged at both ends of the first connecting rod 31. Among them, one end of the cross bar 33 is hinged to the end of the first connecting rod 31, and the other end is hinged to the vertical frame 1. Taking one of the cross bars 33 as an example, one end of the cross bar 33 is hinged to the upper end of the first rod body 311, and the other end is hinged to the vertical frame 1.

[0059] In this embodiment, a triangular support structure can also be formed by the two first rod bodies 311 between the two bottom frames 21, which can also ensure that the trolley has good stability in the unfolded state and is not easy to shake.

[0060] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A folding trolley, characterized in that, Comprising: Two vertical frames, which are arranged oppositely and are both provided with rollers at the bottom; A chassis, comprising two bottom frames hinged at one end, and the mutually remote ends of the two bottom frames are respectively hinged to the two vertical frames; Two side frames, which are respectively arranged on both sides of the vertical frames; the side frames comprise: A first connecting rod, which has a V-shaped connecting rod structure and comprises two first rod bodies hinged at one end, and the middle parts of the two first rod bodies are respectively hinged to the two bottom frames; Two second connecting rods, which are respectively hinged to both ends of the first connecting rod. The second connecting rod comprises a second rod body and a third rod body. One end of the second rod body is hinged to the bottom frame, and the other end is arranged on the vertical frame to form a movable end, and the movable end can rotate relative to the vertical frame and can slide along the length direction of the vertical frame; one end of the third rod body is hinged to the end of the first rod body, and the other end is hinged to the middle part of the second rod body.

2. The folding trolley according to claim 1, wherein, A sliding sleeve is hinged to one end of the second rod body close to the vertical frame, and the sliding sleeve is slidably arranged on the vertical frame along the length direction of the vertical frame.

3. The folding trolley according to claim 2, wherein A protruding part is further arranged on the vertical frame, and the protruding part is arranged below the sliding sleeve for downward limiting of the sliding sleeve.

4. A folding trolley according to claim 1, characterized in that, The mutually close ends of the two bottom frames are hinged through a hinge assembly. The hinge assembly comprises two hinge heads, one end of the two hinge heads is hinged at the bottom, and the other ends are respectively fixed on the two bottom frames. In the unfolded state of the folding trolley, the mutually hinged ends of the two hinge heads are in contact with each other.

5. A folding trolley, characterized in that, Comprising: Two vertical frames, which are arranged oppositely and are both provided with rollers at the bottom; A chassis, comprising two bottom frames hinged at one end, and the mutually remote ends of the two bottom frames are respectively hinged to the two vertical frames; Two side frames, which are respectively arranged on both sides of the vertical frames; the side frames comprise: A first connecting rod, which has a V-shaped connecting rod structure and comprises two first rod bodies hinged at one end, and the middle parts of the two first rod bodies are respectively hinged to the two bottom frames; Two cross bars, which are respectively arranged at both ends of the first connecting rod. Wherein, one end of the cross bar is hinged to the end of the first connecting rod, and the other end is hinged to the vertical frame.

6. The folding trolley according to claim 5, characterized in that, The mutually close ends of the two bottom frames are hinged through a hinge assembly. The hinge assembly comprises two hinge heads, one end of the two hinge heads is hinged at the bottom, and the other ends are respectively fixed on the two bottom frames. In the unfolded state of the folding trolley, the mutually hinged ends of the two hinge heads are in contact with each other.

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