Sliding flat folding cart

Abstract

The utility model discloses a sliding flat folding cart which comprises a front frame, a rear frame, two side folding frames and a bottom folding frame, the two side folding frames are in bilateral symmetry, and the front end and the rear end of the bottom folding frame are movably connected with the lower end of the front frame and the lower end of the rear frame respectively. Each side folding frame comprises four X cross pipes which are sequentially riveted on the same plane, the upper ends and the lower ends of every two adjacent X cross pipes are respectively riveted to form an upper riveting point and a lower riveting point, and the longitudinal linear distance between the upper riveting point and the lower riveting point in the middle is larger than the longitudinal linear distance between the upper riveting point and the lower riveting point on the left side and the right side; and the upper end part of the outermost X-shaped cross pipe is riveted with the front frame or the rear frame, and the lower end part of the outermost X-shaped cross pipe is longitudinally and slidably connected with the front frame or the rear frame. The side folding frames formed by movably riveting the four X-shaped cross pipes are folded, the bottom frame is folded to drive the front frame and the rear frame of the cart to be close to each other to achieve flat folding, the lower ends of the side folding frames are longitudinally and slidably connected with the front frame and the rear frame, the folding design reduces the size of the cart, meanwhile, the folded height is not increased, and batch storage and transportation are facilitated.

Description

Technical Field

[0001] This utility model belongs to the technical field of trolleys, specifically relating to a sliding and folding trolley. Background Technology

[0002] Handcarts are transport vehicles pushed and pulled by human power. Although handcart material handling technology has continuously developed, handcarts remain an indispensable transport tool. Some existing handcarts have a fixed, non-foldable structure, while others are foldable for easy storage. For example, Chinese Patent Publication No. CN205469183 U discloses a fixed structure for a folding handcart. The cart frame includes two symmetrically arranged frames and a central support frame located between the two frames. The two frames can be pivoted towards the central support frame. Although this folding handcart structure can achieve folding, it causes a change in the height of the handcart during folding. The height of the central support frame is higher in the folded state compared to the unfolded state, which is also not conducive to storage and transportation. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a sliding and folding trolley.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a sliding folding trolley, comprising a front frame, a rear frame, two symmetrical side folding frames, and a bottom folding frame, wherein the front and rear ends of the bottom folding frame are respectively movably connected to the lower ends of the front frame and the rear frame;

[0005] The side folding frame includes four X-shaped cross tubes riveted sequentially to the same plane. The upper and lower ends of two adjacent X-shaped cross tubes are riveted to form two riveting points. The longitudinal straight distance between the upper and lower riveting points in the middle is greater than the longitudinal straight distance between the upper and lower riveting points on the left and right sides. The upper end of the outermost X-shaped cross tube is riveted to the front frame or the rear frame, and the lower end is longitudinally slidably connected to the front frame or the rear frame.

[0006] Furthermore, the front frame and the rear frame have the same structure, including two uprights with rollers at the bottom and a lower support tube that are symmetrically arranged on the left and right sides. The two ends of the lower support tube are respectively connected to the upper ends of the two uprights. The upper end of the X-shaped cross tube on the outer side of the side folding frame is riveted to the upper end of the upright, and the lower end is longitudinally slidably connected to the upright.

[0007] Furthermore, the side folding frame also includes a slider slidably mounted on the riser, with the lower end of the outer X-shaped cross tube in the side folding frame riveted to the slider; or, the front frame also includes an upper support tube, with both ends connected to the upper ends of the two risers respectively.

[0008] Furthermore, it also includes a pipe plug and a storage bag placed on the base frame. The upper edge of the storage bag is provided with an installation hole. The cylindrical part of the pipe plug passes through the installation hole and is embedded in the riser. The head of the pipe plug is larger than the diameter of the installation hole.

[0009] Furthermore, the plug has a fixing hole on its side and the riser has a hole on its side. The plug is embedded in the riser and a pin passes through the pin hole and the fixing hole.

[0010] Furthermore, it also includes a U-shaped hanger, with vertical grooves on the two vertical bars of the U-shaped hanger. Either vertical groove is slidably connected to the lower rivet point in the middle of the side folding frame, and the horizontal bar of the U-shaped hanger is located below the bottom folding frame.

[0011] Furthermore, the bottom folding frame includes two bottom frames, each including two side bottom tubes that are narrower on the inside and wider on the outside and arranged in a V-shape, and a horizontal bottom tube connecting the wide ends of the two side bottom tubes. The narrow ends of the two bottom frames are riveted together, and the wide ends of the two outer sides are riveted together with the front frame or the rear frame; or, a retractable handle is rotatably connected to the lower support tube of the front frame.

[0012] Furthermore, the bottom folding frame also includes a tube cover and a central component. The tube cover covers the narrow ends of the two side bottom tubes in the bottom frame. The two bottom frames are symmetrically arranged on the front and rear sides of the central component. The tube cover, together with the narrow ends of the side bottom tubes, extends into the opening of the central component and is riveted.

[0013] Furthermore, it also includes an opening and closing frame and a pair of symmetrically mounted rotating limiters on the rear frame, wherein the opening and closing frame and the rotating limiters are rotatably connected; the inner end of the rotating limiters is movably connected to the rear end of the base frame.

[0014] Furthermore, the inner and outer sides of the rotation limiting member are respectively provided with longitudinal elongated holes and arc-shaped sliding grooves, and the lower end of the opening and closing frame is provided with a first through hole and a second through hole. The first shaft passes through the first through hole and is movably connected to the longitudinal elongated hole, and the second shaft passes through the second through hole and is movably connected to the arc-shaped sliding groove. When the opening and closing frame is opened and closed, the first shaft moves up and down along the longitudinal elongated hole, and the second shaft slides back and forth along the arc-shaped sliding groove.

[0015] Furthermore, a limiting groove is provided on the inner side of the arc-shaped slide groove. When the opening and closing frame rotates and fits into the rear frame in a vertical state, the second shaft slides into the limiting groove.

[0016] The advantages of this utility model are as follows: The folding of the side folding frame and the folding of the base frame, connected by four X-shaped interlocking tubes, allows the front and rear frames of the trolley to fold together and achieve a flat fold. The lower end of the side folding frame is longitudinally slidably connected to the front and rear frames. This sliding connection of the side folding frame reduces the trolley's volume while maintaining its height after folding, facilitating bulk storage and transportation. The sliding connection between the U-shaped hanging rod and the riveting points of the side folding frame enhances the support of the base folding frame and the stability of the trolley during use. The use of tube plugs that mate with the mounting holes on the storage bags allows the four corners of the storage bags to be fixed to the upright tubes. The opening and closing mechanism relative to the rear frame facilitates the placement of items exceeding the length of the base frame, increasing flexibility in use. Attached Figure Description

[0017] Figure 1 It is the first three-dimensional sliding folding cart. Figure 1 ;

[0018] Figure 2 It is the first three-dimensional sliding folding cart. Figure 2 ;

[0019] Figure 3 This is a side view of the first type of sliding folding cart;

[0020] Figure 4 It is a 3D diagram of the storage bag;

[0021] Figure 5 It is a three-dimensional version of the second type of sliding and folding trolley. Figure 1 ;

[0022] Figure 6 This is a breakdown diagram of the second type of sliding folding cart;

[0023] Figure 7 This is a 3D diagram of the bottom folding frame structure of the third type of sliding flat-folding trolley;

[0024] Figure 8 This is a breakdown diagram of the bottom folding frame structure of the third type of sliding flat-folding trolley.

[0025] In the diagram: 1 Front frame, 11 Vertical tube, 11a Pin hole, 12 Lower support tube, 13 Upper support tube, 2 Rear frame, 3 Side folding frame, 31X Cross tube, 32 Middle upper riveting point, 33 Middle lower riveting point, 34 Side riveting point, 35 Slider, 4 Bottom folding frame, 41 Bottom frame, 41a Side bottom tube, 41b Horizontal bottom tube, 5 Pipe plug, 5a Fixing hole, 42 Pipe cap, 43 Center piece, 6 Storage bag, 61 Mounting hole, 62 Mounting opening, 7 U-shaped hanging rod, 7a Vertical slide groove, 8 Opening and closing frame, 8a First through hole, 8b Second through hole, 9 Rotation limit piece, 9a Long longitudinal hole, 9b Arc-shaped slide groove, 9c Limiting groove, 10 Roller, 101 Handle. Detailed Implementation

[0026] The specific solutions and embodiments of this utility model will be further described in conjunction with the accompanying drawings, making the technical solution clearer and more understandable.

[0027] Example 1

[0028] like Figure 1-4 The illustrated sliding folding trolley includes a front frame 1, a rear frame 2, two symmetrical side folding frames 3, and a bottom folding frame 4. The front and rear ends of the bottom folding frame 4 are movably connected to the lower ends of the front frame 1 and the rear frame 2, respectively. The side folding frame 3 includes four X-shaped cross tubes 31 riveted sequentially on the same plane. The upper and lower ends of two adjacent X-shaped cross tubes are riveted to form two riveting points, respectively. The longitudinal straight-line distance h1 between the two middle upper and lower riveting points, namely the middle upper riveting point 32 and the middle lower riveting point 33, is greater than the longitudinal straight-line distance h2 between the two upper and lower side riveting points 34 on the left and right sides. The upper end of the outermost X-shaped cross tube is riveted to the front frame or the rear frame, and the lower end is longitudinally slidably connected to the front frame 1 or the rear frame 3.

[0029] The front frame 1 and the rear frame 2 have the same structure, including two uprights 11 with rollers 10 at the bottom and a lower support tube 12 that are symmetrical on the left and right. The two ends of the lower support tube are respectively connected to the upper ends of the two uprights. The upper end of the X-shaped cross tube on the outer side of the side folding frame is riveted to the upper end of the upright, and the lower end is longitudinally slidably connected to the upright 11.

[0030] The side folding frame 3 also includes a slider 35 that is slidably mounted on the riser 11. The lower end of the outer X-shaped cross tube 31 of the side folding frame 3 is riveted to the slider 35. The front frame 1 also includes an upper support tube 13, the two ends of which are respectively connected to the upper ends of the two risers 11.

[0031] It also includes a tube plug 5 and a storage bag 6 placed on the base frame. The upper edge of the storage bag 6 is provided with a mounting hole 61. The column of the tube plug 5 passes through the mounting hole 61 and is embedded in the riser 11. The head of the tube plug 5 is larger than the diameter of the mounting hole 61. The storage bag 6 is fixed on the four risers. A downward mounting opening 62 can also be provided on the side of the storage bag to install the rivet points on the upper side of two adjacent X-shaped cross tubes in the side folding frame.

[0032] The plug 5 has a fixing hole 5a on its cylindrical side, and the riser 11 has a pin hole 11a on its side. The plug 5 is embedded in the riser 11, and the pin passes through the pin hole 11a and the fixing hole 5a. The upper surface of the head of the plug 5 is an upwardly arched arc surface.

[0033] It also includes a U-shaped hanger 7, with vertical grooves 7a on its two vertical rods. Either vertical groove 7a is slidably connected to the lower central riveting point 33 of the side folding frame. The horizontal rod of the U-shaped hanger 7 is located below the bottom folding frame 4. The pin of the lower central riveting point 33 passes through the vertical groove 7a, and slides within the vertical groove 7a during folding.

[0034] The bottom folding frame 4 includes two bottom frames 41 riveted on the inner side. The bottom frame 41 includes two side bottom tubes 41a that are narrower on the inside and wider on the outside and are distributed in a figure-eight shape, and a horizontal bottom tube 41b that connects the wide ends of the two side bottom tubes. The narrow ends of the inner sides of the two bottom frames 41a are riveted together, and the wide ends of the outer sides are riveted together with the lower support tube 12.

[0035] A retractable handle 101 is rotatably connected to the lower support tube 12 of the front frame 1. The handle 101 can rotate back and forth around the lower support tube 12. The retractable handle design allows the user to adjust the height of the handle, and the height can be reduced when not in use. Compared with the rotatable connection of the front frame, it is easier to fit the front frame more closely when stored.

[0036] In this embodiment, the riveting refers to movable riveting, which allows the two pipes to move relative to each other.

[0037] Example 2

[0038] like Figure 5-6 The sliding folding trolley shown differs from Embodiment 1 in that it further includes an opening / closing frame 8 and a pair of symmetrically mounted rotating limiters 9 on the rear frame 2. The opening / closing frame 8 and the rotating limiters 9 are rotatably connected. The rotating limiters 9 are fixed to the position where the lower horizontal tube and the vertical tube meet by welding or screws. When the opening / closing frame is opened...

[0039] The inner and outer sides of the rotation limiting member 9 are respectively provided with a longitudinal elongated hole 9a and an arc-shaped sliding groove 9b. The lower end of the opening and closing frame 8 is provided with a first through hole 8a and a second through hole 8b. The first shaft passes through the first through hole 8a and is movably connected to the longitudinal elongated hole 9a, and the second shaft passes through the second through hole 8b and is movably connected to the arc-shaped sliding groove 9b. When the opening and closing frame 8 is opened and closed, the first shaft moves up and down along the longitudinal elongated hole 9a, and the second shaft slides back and forth along the arc-shaped sliding groove 9b.

[0040] The inner side of the arc-shaped slide groove 9b is provided with a limiting groove 9c. When the opening and closing frame 8 rotates and fits into the rear frame 1 in a vertical state, the second shaft slides into the limiting groove 9c.

[0041] In this embodiment, the inner end of the rotation limiting member 9 is movably connected to the outer end of the side bottom tube 41a in the bottom folding frame 4.

[0042] Example 3

[0043] Unlike Embodiment 1 or 2, a sliding folding trolley has a bottom folding frame as follows: Figure 7-8 As shown, the bottom folding frame also includes a tube cap 42 and a central component 43. The tube cap 42 covers the narrow ends of the two side bottom tubes 41a in the bottom frame 41. The central component 43 has openings on its front and rear sides. The two bottom frames 41 are symmetrically arranged on the front and rear sides of the central component 43. The tube cap 42, together with the narrow ends of the side bottom tubes 41a, extends into the opening of the central component 43 and is riveted. When folding, the two bottom frames 41 rotate downwards relative to the riveting points at the opening of the central component 43.

[0044] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A sliding folding trolley, characterized in that, It includes a front frame, a rear frame, two symmetrical side folding frames, and a bottom folding frame. The front and rear ends of the bottom folding frame are movably connected to the lower ends of the front frame and the rear frame, respectively. The side folding frame includes four X-shaped cross tubes riveted sequentially to the same plane. The upper and lower ends of two adjacent X-shaped cross tubes are riveted to form two riveting points. The longitudinal straight distance between the upper and lower riveting points in the middle is greater than the longitudinal straight distance between the upper and lower riveting points on the left and right sides. The upper end of the outermost X-shaped cross tube is riveted to the front frame or the rear frame, and the lower end is longitudinally slidably connected to the front frame or the rear frame.

2. The sliding folding trolley according to claim 1, characterized in that, The front frame and the rear frame have the same structure, including two symmetrical uprights and a lower support tube. Rollers are provided at the bottom of the uprights or on the lower support tube. The two ends of the lower support tube are respectively connected to the upper ends of the two uprights. The upper end of the X-shaped cross tube on the outer side of the side folding frame is riveted to the upper end of the upright, and the lower end is longitudinally slidably connected to the upright. The front frame also includes an upper support tube, with both ends connected to the upper ends of the two uprights.

3. A sliding folding trolley according to claim 2, characterized in that, It also includes a pipe plug and a storage bag placed on the base frame. The upper edge of the storage bag is provided with an installation hole. The cylindrical part of the pipe plug passes through the installation hole and is embedded in the riser. The head of the pipe plug is larger than the diameter of the installation hole.

4. A sliding folding trolley according to claim 3, characterized in that, The plug has a fixing hole on its side and the riser has a hole on its side. The plug is embedded in the riser and the pin passes through the pin hole and the fixing hole.

5. A sliding folding trolley according to claim 1, characterized in that, It also includes a U-shaped hanger, with vertical grooves on the two vertical bars of the U-shaped hanger. Either vertical groove is slidably connected to the lower rivet point in the middle of the side folding frame, and the horizontal bar of the U-shaped hanger is located below the bottom folding frame; or, a retractable handle is rotatably connected to the lower support tube of the front frame.

6. A sliding folding trolley according to claim 1, characterized in that, The bottom folding frame includes two bottom frames. Each bottom frame includes two side bottom tubes that are narrower on the inside and wider on the outside, arranged in a V-shape, and a horizontal bottom tube that connects the wide ends of the two side bottom tubes. The narrow ends of the two bottom frames are riveted together, and the wide ends of the two bottom frames are riveted together with the front frame or the rear frame.

7. A sliding folding trolley according to claim 6, characterized in that, The bottom folding frame also includes a tube cover and a central component. The tube cover covers the narrow ends of the two side bottom tubes in the bottom frame. The two bottom frames are symmetrically arranged on the front and rear sides of the central component. The lower openings on the front and rear sides of the central component are connected by the tube cover and the narrow ends of the side bottom tubes, which are riveted into the openings of the central component.

8. A sliding folding trolley according to any one of claims 1-7, characterized in that, It also includes an opening and closing frame and a pair of symmetrically mounted rotating limiters on the rear frame. The opening and closing frame and the rotating limiters are rotatably connected. The inner end of the rotating limiter is movably connected to the rear end of the base frame.

9. A sliding folding trolley according to claim 8, characterized in that, The inner and outer sides of the rotation limiting member are respectively provided with longitudinal elongated holes and arc-shaped sliding grooves. The lower end of the opening and closing frame is provided with a first through hole and a second through hole. The first shaft passes through the first through hole and is movably connected to the longitudinal elongated hole, and the second shaft passes through the second through hole and is movably connected to the arc-shaped sliding groove. When the opening and closing frame is opened and closed, the first shaft moves up and down along the longitudinal elongated hole, and the second shaft slides back and forth along the arc-shaped sliding groove.

10. A sliding folding trolley according to claim 9, characterized in that, The inner side of the arc-shaped slide groove is provided with a limiting groove. When the opening and closing frame rotates and fits into the rear frame in a vertical state, the second shaft slides into the limiting groove.

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