Folding transport vehicle

Abstract

The utility model relates to the field of transport vehicles, in particular to a folding transport vehicle which comprises a plurality of stand columns, a bottom frame, two first side frames and two second side frames. The second side frame comprises a middle connecting rod assembly and shear fork type connecting rods arranged on the two sides of the middle connecting rod assembly. The lower side ends, close to the side of the stand column, of the shear fork type connecting rods can rotate and axially slide relative to the stand column. The middle connecting rod assembly comprises a vertical rod, two first connecting rods, two second connecting rods and two third connecting rods; the first ends of the two first connecting rods are hinged to form a movable hinge point, and the second ends of the two first connecting rods are hinged to the lower side ends of the scissor-type connecting rods on the two sides correspondingly. The movable hinge point can axially slide relative to the vertical rod, and is positioned relative to the vertical rod in the first direction and the second direction; after the transport vehicle is folded, the height of the whole vehicle frame is basically not increased compared with the height of the vehicle frame in an unfolded state, so that the size of the folded vehicle frame is reduced, and the vehicle frame is convenient to package and transport.

Description

Technical Field

[0001] This application relates to the field of transport vehicles, and more particularly to a folding transport vehicle. Background Technology

[0002] Folding transport vehicles, as a convenient means of transportation, are widely used in daily life.

[0003] Folding transport vehicles are currently mainly divided into bundled folding vehicles and flat folding vehicles. These two types of folding vehicles are mainly composed of foldable side frames and foldable base frames. The difference is that for bundled folding vehicles, the base frame and side frames can be folded together in the middle, and the frame presents a bundled shape when folded; while for flat folding vehicles, the side frames and base frames can only be folded together in one direction, generally along the length of the frame, and present a flat state when folded.

[0004] Some existing folding transport vehicles are taller when folded compared to when unfolded, which is not conducive to packaging and transportation, and therefore needs to be improved. Utility Model Content

[0005] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide a folding transport vehicle.

[0006] To achieve the above objectives, this application provides the following technical solution.

[0007] This application provides a folding transport vehicle, including:

[0008] Several columns, each with rollers at its bottom;

[0009] The base frame is hinged to each column and can be folded and retracted along the first direction;

[0010] Two first side frames arranged opposite each other along a first direction;

[0011] Two second side frames are arranged opposite each other along a second direction and both can be folded and retracted along a first direction; the first direction is perpendicular to the second direction;

[0012] The second side frame includes a middle connecting rod assembly and scissor-type connecting rods on both sides of the middle connecting rod assembly. Each side of the scissor-type connecting rod has an upper end and a lower end. The upper end of the scissor-type connecting rod near the column is hinged to the column, and the lower end near the column can rotate and slide axially relative to the column.

[0013] The intermediate link assembly includes:

[0014] The uprights extend vertically, with their lower ends hinged to the middle of the base frame;

[0015] Two first links are provided, with their first ends hinged together to form a movable hinge point, and their second ends respectively hinged to the lower ends of the scissor links on both sides; wherein, in the axial direction of the upright, the movable hinge point can slide relative to the upright, and in the first direction and the second direction, the movable hinge point maintains a relative position with the upright.

[0016] Two second links, the first end of each second link is hinged to the top of the upright, and the second end is respectively hinged to the scissor links on both sides;

[0017] Two third links, the first end of which is hinged to the middle of the second link, and the second end of which is hinged to the upper end of the scissor links on both sides respectively.

[0018] As an optional embodiment of this application, the first ends of the two first connecting rods are hinged together by a hinge shaft, which constitutes the movable hinge point; the upright is provided with a sliding groove extending along the axial direction of the upright; the hinge shaft passes through the sliding groove and can slide along the extension direction of the sliding groove; in the second direction, the upright is located between the first ends of the two first connecting rods.

[0019] As an optional embodiment of this application, the top wall of the chute forms a limiting surface, and when the transport vehicle is in the unfolded state, the hinge shaft abuts against the limiting surface.

[0020] As an optional embodiment of this application, the upright is provided with a slide block that can slide along the upright axis, and the first ends of the two first connecting rods are hinged to the slide block.

[0021] As an optional embodiment of this application, the upright is provided with a limiting protrusion on the upper side of the slide block, and when the transport vehicle is in the unfolded state, the slide block abuts against the limiting protrusion.

[0022] As an optional embodiment of this application, the scissor link includes one or more first X-shaped links that are sequentially hinged along a first direction; the first X-shaped link includes a fourth link and a fifth link that are hinged together at the middle; wherein, in the first X-shaped link near the column, the first end of the fifth link is hinged to the top of the column, and the first end of the fourth link is rotatable and axially sliding relative to the column; in the first X-shaped link near the middle link assembly, the second end of the fifth link is hinged to the second end of the first link, and the second end of the fourth link is hinged to the second end of the third link.

[0023] As an optional embodiment of this application, the column is provided with a sliding sleeve that can slide along the column axis; the lower end of the scissor link near the column is hinged to the sliding sleeve.

[0024] As an optional embodiment of this application, the first side frame can be folded and retracted along the second direction, and the base frame can be folded and retracted along the second direction.

[0025] As an optional embodiment of this application, the first side frame includes one or more second X-shaped links that are sequentially hinged along a second direction; the second X-shaped links include a sixth link and a seventh link that are hinged together at the middle; the end of the sixth link near the column can slide synchronously along the column axis with the lower end of the scissor link near the column, and can rotate relative to the column; the end of the seventh link near the column is hinged to the top of the column;

[0026] And / or the base frame includes two X-shaped folding frames arranged sequentially along a first direction; the X-shaped folding frame includes a connecting seat and four base rods with their first ends hinged to the connecting seat; wherein the second ends of two base rods are respectively hinged to two uprights on the same side, and the second ends of the other two base rods are respectively hinged to the bottom of the two uprights.

[0027] As an optional embodiment of this application, the base frame includes two bottom frames arranged sequentially along a first direction and hinged to each other; the ends of the two bottom frames that are far apart from each other are hinged to two columns on the same side; the upright is hinged to one of the bottom frames at the hinge point between the two bottom frames.

[0028] The bottom frame includes two frames arranged sequentially along a first direction and hinged to each other at their ends. When the frame is in the unfolded state, the hinged ends of the two frames abut against each other to prevent the two frames from flipping downwards.

[0029] Compared with the prior art, this application has the following advantages:

[0030] The second side frame of this application includes a central connecting rod assembly and scissor-type connecting rods located on both sides of the central connecting rod assembly. Through the cooperation of the connecting rods in the second side frame, the height of the entire frame will not increase significantly after the transport vehicle is folded compared to the height of the frame in the unfolded state. This helps to reduce the volume of the folded frame, making it easier to package and transport.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0032] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, wherein:

[0033] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0034] Figure 1 This is a schematic diagram of the structure in the unfolded state of Embodiment 1 of this application (the movable hinge point R2 is constructed according to Embodiment 1).

[0035] Figure 2 for Figure 1 The main view;

[0036] Figure 3 This is a schematic diagram of the structure during the folding process of Embodiment 1 of this application;

[0037] Figure 4 This is a schematic diagram of the structure in the folded state of Embodiment 1 of this application;

[0038] Figure 5 This is a schematic diagram of the structure in the unfolded state of Embodiment 1 of this application (the movable hinge point R2 is constructed according to Embodiment 2).

[0039] Figure 6 for Figure 5 The main view;

[0040] Figure 7 This is a schematic diagram of the structure in the unfolded state of Embodiment 2 of this application (the movable hinge point R2 is constructed according to Embodiment 1).

[0041] Figure 8 for Figure 7 The main view;

[0042] Figure 9 This is a schematic diagram of the structure during the folding process of Embodiment 2 of this application;

[0043] Figure 10 This is a schematic diagram of the structure in the folded state of Embodiment 2 of this application;

[0044] Figure 11 This is a schematic diagram of the structure in the unfolded state of Embodiment 2 of this application (the movable hinge point R2 is constructed according to Embodiment 2).

[0045] Figure 12 for Figure 11 The main view.

[0046] Explanation of the labels in the diagram:

[0047] 1. Column; 11. Roller; 12. Sliding sleeve;

[0048] 2. Second side frame; 21. Intermediate connecting rod assembly; 210. Upright; 2101. Slide groove; 211. First connecting rod; 212. Second connecting rod; 213. Third connecting rod; 22. First X-shaped connecting rod; 221. Fourth connecting rod; 222. Fifth connecting rod;

[0049] 3. First side frame; 31. Second X-shaped link; 311. Sixth link; 312. Seventh link; 32. Connecting rod;

[0050] 4. Base frame; 41. X-shaped folding frame; 411. Connecting seat; 412. Base rod; 42. Base frame; 421. Frame body; 422. Hinge seat;

[0051] 51. Hinge shaft; 52. Shaft body; 53. Slide block; 54. Limiting protrusion. Detailed Implementation

[0052] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Example 1

[0054] Reference Figure 1-6 As shown, this embodiment provides a folding transport vehicle, which mainly includes several uprights 1, a base frame 4, two first side frames 3, two second side frames 2, etc.

[0055] Among them, such as Figure 1 As shown, two first side frames 3 are arranged opposite each other along a first direction, and two second side frames 2 are arranged opposite each other along a second direction. The first direction and the second direction are perpendicular to each other. For example, if the first direction is understood as the length direction of the entire transport vehicle, then the second direction can be understood as the width direction of the entire transport vehicle.

[0056] Thus, the two first side frames 3 and the two second side frames 2 together form a rectangular frame structure, serving as the four side walls of the transport vehicle; and preferably, there are four uprights 1, which are respectively located at the four corners of the aforementioned rectangular frame to connect the first side frames 3 and the second side frames 2. It is understood that each upright 1 is equipped with a roller 11 at its bottom to ensure that the transport vehicle can move.

[0057] The base frame 4 serves as the bottom wall of the entire transport vehicle, and its end near the column 1 is hinged to the lower part of each column 1.

[0058] In order to enable the entire transport vehicle to be folded in the first direction, in this embodiment, both the base frame 4 and the second side frame 2 can be folded and folded in the first direction.

[0059] Combination Figure 2As shown, in order to enable the second side frame 2 to be folded and retracted in the first direction, in this embodiment, the second side frame 2 includes a middle connecting rod assembly 21 and scissor-type connecting rods disposed on both sides of the middle connecting rod assembly 21.

[0060] The scissor link has an upper end and a lower end on both sides. It can be understood that the scissor link is similar to a movable X-shaped structure, so each side will have two ends. Of the two ends on the same side, the one on the upper side is the upper end, and the one on the lower side is the lower end.

[0061] For example, in some embodiments, the scissor link includes one or more first X-shaped links 22 that are sequentially hinged along a first direction.

[0062] For example, such as Figure 2 As shown in the figure, the scissor link shown in this embodiment includes only one first X-shaped link 22, that is, a first X-shaped link 22 is provided on both sides of the intermediate link assembly 21; the following is a specific description using this case as an example.

[0063] The first X-shaped link 22 includes a fourth link 221 and a fifth link 222 that are hinged together in the middle. For ease of explanation, the hinge point between the two is referred to as the first hinge point R1, so that the fourth link 221 and the fifth link 222 can rotate relative to each other based on the first hinge point R1 to achieve mutual folding and retraction.

[0064] Taking a scissor link consisting of only one first X-shaped link 22 as an example, the two sides of the scissor link are respectively referred to as the first side and the second side. In this case, the upper end and the lower end of the scissor link can be understood as follows:

[0065] like Figure 2 As shown, the first end of the fifth link 222 (the end closest to the column 1) constitutes the upper end of the first side of the aforementioned scissor link, and the first end of the fourth link 221 (the end closest to the column 1) constitutes the lower end of the first side of the aforementioned scissor link.

[0066] Accordingly, the second end of the fifth link 222 constitutes the lower end of the second side of the aforementioned scissor link; the second end of the fourth link 221 constitutes the upper end of the second side of the scissor link.

[0067] Specifically, the upper end of the scissor link near the column 1 (i.e., the first side) is hinged to the column 1. In particular, the first end of the fifth link 222 is hinged to the top of the column 1.

[0068] Furthermore, the lower end of the scissor link near the column 1 (i.e., the first side) can rotate and slide axially relative to the column 1. Here, axial direction can be understood as the length direction or extension direction of the column 1. Specifically, the first end of the fourth link 221 can rotate and slide axially relative to the column 1.

[0069] In some embodiments, in order to enable the first end of the fourth link 221 to rotate and slide axially relative to the column 1, such as Figure 1 As shown, a sliding sleeve 12 that can slide along the axial direction of the column 1 is fitted onto the column 1; the lower end of the scissor link near the column 1 (i.e., the first side) is hinged to the sliding sleeve 12, that is, the first end of the fourth link 221 is hinged to the sliding sleeve 12. Thus, the sliding of the sliding sleeve 12 drives the first end of the fourth link 221 to slide axially, and the fourth link 221 rotates relative to the sliding sleeve 12, thereby realizing the rotation of the fourth link 221 relative to the column 1.

[0070] In this embodiment, the intermediate connecting rod assembly 21 is specifically constructed as follows: Figure 1 and Figure 2 As shown, the intermediate link assembly 21 includes a vertical rod 210, two first links 211, two second links 212, and two third links 213.

[0071] The upright 210 extends vertically, which can be understood as the height direction of the transport vehicle; and the lower end of the upright 210 is hinged to the middle of the base frame 4.

[0072] Among them, such as Figure 2 As shown, the first ends of the two first links 211 are hinged to each other to form a movable hinge point R2, allowing the two first links to rotate relative to each other based on the movable hinge point R2. At the same time, the second ends of the two first links 211 are respectively hinged to the lower ends of the second side of the scissor links on both sides; specifically, the second end of the first link 211 is hinged to the second end of the fifth link 222, and the hinge point between the two is denoted as the fifth hinge point R5.

[0073] Furthermore, the movable hinge point R2 is configured such that it can slide relative to the upright 210 along its axial direction; that is, it can slide on the upright 210 along its axial direction. In both the first and second directions, the movable hinge point R2 maintains a relative position with the upright 210. This relative positioning can be understood as meaning that the movable hinge point R2 is essentially unable to undergo relative displacement with the upright 210 in both directions. In short, the movable hinge point R2 is configured such that it can only undergo relative displacement along the axial direction of the upright 210.

[0074] It is worth noting that the axial direction of the pole claimed in this embodiment can also be understood as the length direction of the pole.

[0075] In order to enable the movable hinge point R2 to slide relative to the upright 210 in the axial direction of the upright 210, and to maintain a relative position with the upright 210 in the first and second directions, the movable hinge point R2 can be implemented in two ways, namely, Embodiment 1 and Embodiment 2. The two embodiments are described in detail below:

[0076] Implementation method one: such as Figures 1-4 As shown, the first ends of the two first connecting rods 211 are hinged together by a hinge shaft 51, at which time the hinge shaft 51 constitutes the movable hinge point R2; in the second direction, the upright rod 210 is located between the first ends of the two first connecting rods 211, which is equivalent to the upright rod 210 being clamped between the first ends of the two first connecting rods 211, so that the first ends of the two first connecting rods 211 and the hinge shaft 51 (i.e., the movable hinge point R2) cannot be relatively displaced relative to the upright rod 210 in the second direction.

[0077] At the same time, such as Figure 1 and Figure 2 As shown, a groove 2101 extending axially along the upright 210 is provided on the upright 210, and the groove 2101 passes through the upright 210 in the second direction. The hinge shaft 51 passes through the groove 2101 and can slide along the extension direction of the groove 2101 (i.e., the length direction of the groove 2101). The two ends of the hinge shaft 51 extend out of the inner and outer sides of the groove 2101 respectively to be hinged to the first ends of the two first connecting rods 211 respectively. In addition, the width of the groove 2101 is basically the same as or close to the diameter of the hinge shaft 51, so as to restrict the relative displacement of the hinge shaft 51 in the first direction within the groove 2101, that is, to make the movable hinge point R2 relative to the upright 210 in the first direction. Moreover, the hinge shaft 51 can also slide in the groove 2101 along the length direction of the groove 2101, so that the movable hinge point R2 can slide relative to the upright 210 in the axial direction of the upright 210.

[0078] In the first embodiment, when the second side frame 2 is folded along the first direction, as the folding action proceeds, the hinge shaft 51 slides down the slide groove 2101, and at the same time the first connecting rod 211 rotates around the hinge shaft 51, thereby driving the entire second side frame 2 to retract and fold along the first direction, and finally be completely folded.

[0079] Conversely, when the second side frame 2 is gradually unfolded from the folded state, as the unfolding action proceeds, the hinge shaft 51 will slide up along the slide groove 2101, and at the same time the first connecting rod 211 will rotate around the hinge shaft 51, thereby driving the entire second side frame 2 to gradually unfold along the first direction, and finally be fully unfolded.

[0080] To ensure the second side frame 2 can be stably maintained in the deployed state, in this embodiment, the top wall of the slide 2101 forms a limiting surface. When the transport vehicle is in the deployed state, such as Figure 1 and Figure 2 In the indicated state, the hinge shaft 51 abuts against the limiting surface, thereby restricting the hinge shaft 51 from continuing to slide upward in the slide groove 2101.

[0081] Implementation Method Two: Combining Figure 5 and Figure 6 As shown, the upright 210 is provided with a slide block 53 that can slide along the axial direction of the upright 210. In some embodiments, the slide block 53 has a sleeve-like structure and is slidably mounted on the upright 210, so that the slide block 53 can only slide relative to the upright along the axial direction of the upright 210; and the first ends of the two first connecting rods 211 are hinged to the slide block 53, for example, as Figure 6 As shown, the first ends of the two first connecting rods 211 are hinged together by a shaft 52. One end of the shaft 52 is fixed on the slide block 53. At this time, the shaft 52 is equivalent to the movable hinge point R2. It is relatively fixed with the slide block 53. The slide block 53 slides along the upright, causing the movable hinge point R2 to slide along the length direction of the upright 210, so that the movable hinge point R2 can slide along the axial direction of the upright 210. In addition, since the slide block 53 is relatively positioned relative to the upright 210 in the first and second directions, the movable hinge point R2 is convenient for the upright to maintain relative positioning in the first and second directions.

[0082] Similar to the implementation method, in order to ensure that the second side frame 2 can be kept relatively stably in the unfolded state, in this embodiment, as follows: Figure 6 As shown, a limiting protrusion 54 is fixedly connected to the upper side of the slide block 53 on the upright 210. When the transport vehicle is in the unfolded state, the slide block 53 abuts against the limiting protrusion 54, thereby restricting the slide sleeve from continuing to slide upward on the upright 210.

[0083] In this embodiment, the specific formation of the movable hinge point R2 can be any one of the above-described embodiments one and two. Of course, it can also be other structures that can achieve the same effect, and no specific limitation is made here.

[0084] Based on the aforementioned active hinge point R2, in this embodiment, as follows: Figure 2 As shown, the first ends of the two second links 212 are both hinged to the top of the upright 210. Preferably, the first ends of the two second links 212 are hinged to the top of the upright 210 about the same axis of rotation. In other words, the first ends of the two second links 212 are hinged to the top of the upright 210 at the same third hinge point R3.

[0085] In addition, the second ends of the two second links 212 are respectively hinged to the scissor links on both sides. Specifically, the second end of the second link 212 is hinged to the fifth link 222, and the hinge point between the two is denoted as the fourth hinge point R4, where the fourth hinge point R4 is located between the first end of the fifth link 222 and the fifth hinge point R5.

[0086] The first ends of the two third links 213 are respectively hinged to the middle of the two second links 212. The hinge point between them is denoted as the sixth hinge point R6, which is located between the third hinge point R3 and the fourth hinge point R4.

[0087] In addition, the second ends of the two third links 213 are respectively hinged to the upper ends of the second side of the scissor links on both sides. Specifically, the second end of the third link 213 is hinged to the second end of the fourth link 221.

[0088] Based on the aforementioned second side frame 2, when the second side frame 2 is folded and retracted along the first direction, the base frame 4 gradually retracts along the first direction, while the sliding sleeve 12 slides downward on the column 1, causing the scissor-type connecting rods to retract relative to each other along the first direction, such as... Figure 3 As shown, simultaneously, the intermediate connecting rod assembly 21 retracts along the first direction, ultimately completing the folding of the first side frame 3, presenting... Figure 4 The folded state is shown. Based on the above settings, when the transport vehicle is in a fully folded state, its overall height is basically not increased compared to the height of the transport vehicle in a fully unfolded state.

[0089] In this embodiment, the first side frame 3 and the base frame 4 cannot be folded in the second direction, but can only be folded in the first direction. Specifically, as shown... Figure 1 As shown, the first side frame 3 includes a connecting rod 32, the two ends of which are fixed to two adjacent columns 1 in the second direction. For example, the first side frame 3 includes two connecting rods 32, which extend along the second direction, one up and one down, to fix two adjacent columns 1 along the first direction.

[0090] The base frame 4 includes two bottom frames 42 arranged sequentially along the first direction and hinged to each other; the ends of the two bottom frames 42 that are far apart from each other are hinged to two columns 1 on the same side, specifically, they are hinged to the connecting rod 32 located on the lower side of the column 1.

[0091] The upright 210 is hinged to one of the two base frames 42 at the hinge point between them, that is, the hinge point between the upright 210 and the base frame 42 coincides with the hinge point between the two base frames 42.

[0092] The bottom frame 42 includes two frame bodies 421 arranged sequentially along a first direction and hinged to each other at their ends. When the frame is in the unfolded state, as... Figure 2As shown, the hinged ends of the two frames 421 abut against each other to prevent the two frames 421 from flipping downwards. Specifically:

[0093] like Figure 2 As shown, the bottom frame 42 also includes a hinge; the hinge includes two hinge seats 422 that are hinged to each other at one end of the bottom side, and the two hinge seats 422 are respectively fixed to the ends of the two frame bodies 421 of the bottom frame 42; when the frame is in the unfolded state, the ends of the two hinge seats 422 abut against each other, thereby restricting the two frame bodies 421 from flipping downwards relative to each other, so that the frame bodies 421 remain in the unfolded state to bear the load.

[0094] It is understood that in this embodiment, the rotation axis of each hinge point in the second side frame 2 is parallel to the second direction.

[0095] With the above configuration, the folding transport vehicle provided in this embodiment is essentially a flattenable folding transport vehicle. That is, the entire frame can only be folded along the first direction. When folding, the bottom frame 42 flips upward and folds together along the first direction, thereby causing the second side frame 2 to fold together along the first direction, ultimately allowing the entire transport vehicle to be folded into a flattened shape. Figure 4 The state shown.

[0096] Example 2

[0097] Reference Figure 7-12 As shown, this embodiment provides another type of folding transport vehicle based on embodiment 1. The difference between this embodiment and embodiment 1 is that the base frame 4 and the first side frame 3 are different.

[0098] In Embodiment 1, a flattenable and foldable transport vehicle was provided, while this embodiment provides a transport vehicle that can be folded in a bundle-like manner, such as... Figure 7-10 The image shows a transport vehicle in which the movable hinge point R2 in the intermediate connecting rod component adopts the method described in Embodiment 1. Figure 11 and Figure 12 The demonstration shows a transport vehicle using the second embodiment for the movable hinge point R2 in the intermediate connecting rod component. For details regarding the second side frame employing these two embodiments, please refer to the description in Embodiment 1.

[0099] In this embodiment, as in this embodiment, Figure 7 As shown, the base frame 4 can be folded and retracted not only along the first direction but also along the second direction; simultaneously, both first side frames 3 can be folded and retracted along the second direction. This allows the entire transport vehicle to be retracted simultaneously in both length and width directions, ultimately forming a bundled folded state, as shown... Figure 10 The state shown; specifically:

[0100] like Figure 7As shown, the first side frame 3 includes one or more second X-shaped connecting rods 31 that are sequentially hinged along the second direction; for example, this embodiment shows the case where the first side frame 3 includes two second X-shaped connecting rods 31 that are sequentially hinged along the second direction. The following is a detailed explanation using this example:

[0101] In order to enable the first side frame 3 to be folded and retracted along the second direction, such as Figure 7 As shown, the second X-shaped link 31 includes a sixth link 311 and a seventh link 312 hinged together in the middle; in the first side frame 3, the first ends of the two sixth links 311 are hinged to each other, the second ends of the two sixth links 311 are provided on the column 1, and the second ends of the sixth links 311 can slide along the axial direction of the column 1 and can rotate relative to the column 1. Specifically, as shown... Figure 7 As shown, the second end of the sixth link 311 is hinged to the sliding sleeve 12 so as to slide axially synchronously with the first end of the fourth link 221 on the same column 1.

[0102] The first ends of the two seventh links 312 are hinged to each other, and the second ends of the two seventh links 312 are respectively hinged to the top of the two columns 1.

[0103] In order for the base frame 4 to be folded and retracted simultaneously along the first and second directions, such as Figure 7 As shown, the base frame 4 includes two X-shaped folding frames 41 arranged sequentially along a first direction; each X-shaped folding frame 41 includes a connecting seat 411 and four base rods 412 whose first ends are hinged to the connecting seat 411, wherein, in the fully unfolded state of the base frame 4, as Figure 7 The top wall of the first end of the base rod 412 abuts against the connecting seat 411 to restrict the connecting seat 411 from flipping downward relative to the base rod 412, thereby keeping the base frame 4 in an unfolded state for load bearing.

[0104] Of the four base rods 412, the second ends of two base rods 412 are respectively hinged to the two uprights 1 on the same side, and the second ends of the other two base rods 412 are respectively hinged to the bottom of the two uprights 210.

[0105] Thus, when the transport vehicle provided in this embodiment is folded, the connecting seat 411 in the base frame 4 will flip upward relative to the base rod 412, as shown. Figure 9 As shown; this pulls the second side frame 2 to fold and retract along the first direction, and the first side frame 3 to fold and retract along the second direction, causing the entire transport vehicle to fold and retract towards the center, ultimately forming a bundle-like shape after folding, as shown. Figure 10 As shown.

[0106] The folding transport vehicle provided in this embodiment will not cause the height of the transport vehicle to increase after folding.

[0107] It is worth noting that, such as Figure 7-10 The diagram shows a transport vehicle in which the movable hinge point R2 in the intermediate connecting rod component is implemented as described in Embodiment 1; while Figure 11 and Figure 12 The vehicle shown is a transport vehicle in which the movable hinge point R2 in the intermediate connecting rod component adopts the method of implementation method two.

[0108] Figures 7-10 The transport vehicle on display, and Figures 11-12 The transport vehicles shown have essentially the same chassis 4 and first side frame 3 structure, both of which can be folded and stowed along the second direction. The difference lies in the construction of their movable hinge point R2: Figures 7-10 The movable articulation point R2 in the displayed transport vehicle adopts the construction described in Embodiment 1 of Example 1; while Figures 11-12 The movable articulation point R2 of the transport vehicle shown adopts the structure described in Embodiment 2 of Example 1. For details regarding the specific structures of Embodiment 1 and Embodiment 2, please refer to the description in the Embodiment 1 section; further details will not be repeated here.

[0109] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0111] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. Folding transport vehicle, including: Several columns, each with rollers at its bottom; The base frame is hinged to each column and can be folded and retracted along the first direction; Two first side frames arranged opposite each other along a first direction; Two second side frames arranged opposite each other along a second direction and both capable of being folded and retracted along a first direction; the first direction is perpendicular to the second direction; characterized in that: The second side frame includes a middle connecting rod assembly and scissor-type connecting rods on both sides of the middle connecting rod assembly. Each side of the scissor-type connecting rod has an upper end and a lower end. The upper end of the scissor-type connecting rod near the column is hinged to the column, and the lower end near the column can rotate and slide axially relative to the column. The intermediate link assembly includes: The uprights extend vertically, with their lower ends hinged to the middle of the base frame; Two first links are provided, with their first ends hinged together to form a movable hinge point, and their second ends respectively hinged to the lower ends of the scissor links on both sides; wherein, in the axial direction of the upright, the movable hinge point can slide relative to the upright, and in the first direction and the second direction, the movable hinge point maintains a relative position with the upright. Two second links, the first end of each second link is hinged to the top of the upright, and the second end is respectively hinged to the scissor links on both sides; Two third links, the first end of which is hinged to the middle of the second link, and the second end of which is hinged to the upper end of the scissor links on both sides respectively.

2. The folding transport vehicle according to claim 1, characterized in that, The first ends of the two first connecting rods are hinged together by a hinge shaft, which forms the movable hinge point; the upright is provided with a sliding groove extending along the axial direction of the upright; the hinge shaft passes through the sliding groove and can slide along the extension direction of the sliding groove; in the second direction, the upright is located between the first ends of the two first connecting rods.

3. The folding transport vehicle according to claim 2, characterized in that, The top wall of the chute forms a limiting surface, and when the transport vehicle is in the unfolded state, the hinge shaft abuts against the limiting surface.

4. The folding transport vehicle according to claim 1, characterized in that, The upright is provided with a slide block that can slide along the upright axis, and the first ends of the two first connecting rods are hinged to the slide block.

5. The folding transport vehicle according to claim 4, characterized in that, The upright has a limiting protrusion on the upper side of the slide block. When the transport vehicle is in the unfolded state, the slide block abuts against the limiting protrusion.

6. The folding transport vehicle according to claim 1, characterized in that, The scissor link includes one or more first X-shaped links that are sequentially hinged along a first direction; the first X-shaped link includes a fourth link and a fifth link that are hinged together at the middle; wherein, in the first X-shaped link near the column, the first end of the fifth link is hinged to the top of the column, and the first end of the fourth link is capable of rotating and sliding axially relative to the column; in the first X-shaped link near the middle link assembly, the second end of the fifth link is hinged to the second end of the first link, and the second end of the fourth link is hinged to the second end of the third link.

7. The folding transport vehicle according to claim 1, characterized in that, The column is provided with a sliding sleeve that can slide along the column axis; the lower end of the scissor-type connecting rod near the column is hinged to the sliding sleeve.

8. The folding transport vehicle according to claim 1, characterized in that, The first side frame can be folded and retracted along the second direction, and the base frame can also be folded and retracted along the second direction.

9. The folding transport vehicle according to claim 8, characterized in that, The first side frame includes one or more second X-shaped links that are sequentially hinged along a second direction; the second X-shaped links include a sixth link and a seventh link that are hinged together in the middle; the end of the sixth link near the column can slide synchronously along the column axis with the lower end of the scissor link near the column, and can rotate relative to the column; the end of the seventh link near the column is hinged to the top of the column. And / or the base frame includes two X-shaped folding frames arranged sequentially along a first direction; the X-shaped folding frame includes a connecting seat and four base rods with their first ends hinged to the connecting seat; wherein the second ends of two base rods are respectively hinged to two uprights on the same side, and the second ends of the other two base rods are respectively hinged to the bottom of the two uprights.

10. The folding transport vehicle according to claim 1, characterized in that, The base frame includes two bottom frames arranged sequentially along a first direction and hinged to each other; the ends of the two bottom frames that are far apart from each other are hinged to two columns on the same side; the upright is hinged to one of the bottom frames at the hinge point between the two bottom frames. The bottom frame includes two frames arranged sequentially along a first direction and hinged to each other at their ends. When the frame is in the unfolded state, the hinged ends of the two frames abut against each other to prevent the two frames from flipping downwards.

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