A flat-fold stroller with a double-jointed chassis

Abstract

The utility model discloses a flat folding cart with double hinged element chassis, including four bottom rollers of vertical pipe of symmetrical distribution in four corners, and the folding frame is established between the left and right side two vertical pipes, and the front and back side adjacent vertical pipe is connected through the lower cross pipe, still includes double hinged element chassis, the double hinged element chassis includes center hinge piece, four side hinge pieces and two bottom frames, and the left and right of bottom frame inboard are connected with a side hinge piece respectively, and the front and back side of center hinge piece is hinged with the side riveting piece of two bottom frames respectively, and the lower cross pipe of bottom frame outboard and front side or back side is movably connected. The combination of vertical pipe and folding frame, double hinged element chassis realizes the flat folding storage of whole cart, reduces the floor area of cart in the state of not using, also is favorable to storage and transportation, and is convenient for user to carry outside.

Description

Technical Field

[0001] This utility model belongs to the technical field of trolleys, specifically relating to a flat folding trolley with a double-hinged base frame. Background Technology

[0002] The main function of a handcart is to facilitate the carrying and transportation of goods, and it is generally a vehicle for moving goods by pushing or pulling. One existing type of handcart is a flatbed cart. For example, Chinese patent CN222611189U discloses a handcart with a reinforced structure, including a frame, a handle fixedly mounted on the top of the frame, and wheels at the bottom of the frame. Although this type of handcart can carry items, because the frame is fixed and cannot be folded, it occupies a large area when not in use, resulting in a high space utilization rate, which is not conducive to transportation and carrying, and has its drawbacks. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a flat folding trolley with a double-hinged base frame.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a flat folding trolley with a double-hinged base frame, comprising four vertical tubes symmetrically distributed at the four corners with rollers at the bottom, a folding frame between two adjacent vertical tubes on the left and right sides, and a lower horizontal tube connecting adjacent vertical tubes on the front and rear sides, and a double-hinged base frame, wherein the double-hinged base frame comprises a central hinge, four side hinges and two base frames, one side hinge is connected to the left and right sides of the inner side of the base frame, the front and rear sides of the central hinge are respectively hinged to the side riveting parts of the two base frames, and the outer side of the base frame is movably connected to the lower horizontal tube on the front or rear side.

[0005] Furthermore, the central hinge includes a central horizontal tube and two rivet joints located on the left and right sides of the central horizontal tube. The front and rear sides of the rivet joints are respectively provided with first lugs, and the side hinge is provided with second lugs. The first lugs and the second lugs are movably riveted together.

[0006] Furthermore, the rivet joint and the side rivet are U-shaped pieces with openings at the bottom.

[0007] Furthermore, the upper wall of the rivet joint or the upper wall of the side rivet joint is provided with front baffles that are folded downwards on both the front and rear sides, or the upper surface of the rivet joint is provided with a protrusion.

[0008] Furthermore, the sidewall of the rivet joint has a lower edge extending towards the center.

[0009] Furthermore, the bottom frame includes two symmetrical side tubes and a horizontal bottom tube connecting the two side tubes. The side riveting pieces are installed on the inner side of the side tubes, and the outer side of the side tubes are movably riveted to the lower horizontal tube.

[0010] Furthermore, a U-shaped connector is provided on the inner side of the lower horizontal tube, and the outer side of the side tube extends into the U-shaped connector for movable riveting.

[0011] Furthermore, the folding frame includes one or more movably riveted X-shaped cross tubes, the lower front and rear ends of the folding frame are longitudinally slidably connected to the vertical tube via a sliding seat, and the upper front and rear ends of the folding frame are movably riveted to the upper fixed seat at the top of the vertical tube.

[0012] Furthermore, upper horizontal tubes are provided on the front and rear sides, with each end of the upper horizontal tube connected to the upper end of two vertical tubes respectively.

[0013] Furthermore, a handle rod that can rotate back and forth is movably riveted to the lower horizontal tube on the front side.

[0014] The advantages of this utility model are as follows: The combination of a vertical tube, a folding frame, and a double-hinged base frame allows the entire trolley to be folded flat for storage, reducing its footprint when not in use and facilitating storage and transportation, making it convenient for users to carry when out and about; the double-hinged base frame, consisting of a central hinge and side rivets connecting two bottom frames, connects the front and rear sides of the trolley, providing better support stability; when folding, lifting the bottom horizontal tube on the central hinge pulls the front and rear sides closer together, causing the side folding frame to fold; the central hinge effectively reduces the height of the folded base frame; and the trolley is pulled by a handle, making it more convenient to use. Attached Figure Description

[0015] Figure 1 It is the first flat-folding trolley with a double-hinged base frame. Figure 1 ;

[0016] Figure 2 It is the first flat-folding trolley with a double-hinged base frame. Figure 2 ;

[0017] Figure 3 This is a demonstration diagram of a double-hinged base frame;

[0018] Figure 4 This is a bottom view of the central hinge.

[0019] Figure 5 It is a 3D diagram of the storage bag;

[0020] Figure 6 This is a three-dimensional diagram of the second type of flat-folding trolley with a double-hinged base frame.

[0021] In the diagram: 1. Vertical tube, 2. Roller, 3. Folding frame, 31X cross tube, 4. Lower horizontal tube, 5. Double hinge base frame, 51. Central hinge, 51a. Central horizontal tube, 51b. Rivet joint, 51c. First lug, 51d. Protrusion, 51e. Lower edge, f. Front baffle, 52. Side hinge, 52a. Second lug, 53. Base frame, 53a. Side tube, 53b. Horizontal bottom tube, 6. U-shaped connector, 7. Sliding seat, 8. Upper fixed seat, 9. Upper horizontal tube, 10. Handle rod, 11. Pipe plug, 12. Storage bag, 121. Mounting hole. Detailed Implementation

[0022] 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.

[0023] Example 1

[0024] like Figure 1-5 The folding trolley shown includes four vertical tubes 1 symmetrically distributed at the four corners, each with a roller 2 at the bottom. A folding frame 3 is provided between two adjacent vertical tubes 1 on the left and right sides. The adjacent vertical tubes on the front and rear sides are connected by a lower horizontal tube 4. The folding trolley also includes a double-hinged base frame 5. The double-hinged base frame includes a central hinge 51, four side hinges 52, and two base frames 53. A side hinge 52 is connected to the left and right sides of the inner side of the base frame 53. The front and rear sides of the central hinge 51 are hinged to the side rivets 52 of the two base frames 53 respectively. The outer side of the base frame 53 is movably connected to the lower horizontal tube 4 on the front or rear side.

[0025] The two support points on the front and rear sides of the central hinge connect the two base frames. Compared with the single-support point connection method where the two base frames are directly connected, the use of the central hinge effectively reduces the height of the folded base frame, resulting in better support stability of the base frame.

[0026] The central hinge includes a central horizontal tube 51a and two rivet joints 51b located on the left and right sides of the central horizontal tube. The front and rear sides of the rivet joints 51b are respectively provided with first lugs 51c. The side hinge 52 is provided with second lugs 52a. The first lugs 51c and the second lugs 52a are movably riveted together.

[0027] The rivet joint 51b and the side rivet 52 are U-shaped pieces with openings at the bottom.

[0028] The front and rear sides of the upper wall of the rivet joint 51b or the side rivet 52 are provided with front baffles f formed by downward folding; the upper surface of the rivet joint is provided with a protrusion 51d, which preferably adopts a number of parallel convex strips, and the length direction of the convex strips is distributed along the front and rear.

[0029] The rivet joint 51b has a lower edge 51e extending towards the center on its side wall.

[0030] The bottom frame 53 includes two side tubes 53a that are symmetrical on the left and right and a horizontal bottom tube 53b that connects the two side tubes. The side riveting member 52 is installed on the inner side of the side tube 53a and the outer side of the side tube 53a is movably riveted to the lower horizontal tube 4.

[0031] The lower horizontal tube 4 is provided with a U-shaped connector 6 on its inner side, and the outer side of the side tube 53a extends into the U-shaped connector 6 for movable riveting.

[0032] The folding frame 3 includes three movable riveted X-shaped cross tubes 31. The lower front and rear ends of the folding frame 3 are longitudinally slidably connected to the vertical tube 1 via a sliding seat 7. The upper front and rear ends of the folding frame 3 are movablely riveted to the upper fixed seat 8 at the top of the vertical tube 1.

[0033] The front and rear sides are also provided with upper horizontal tubes 9, and the two ends of the upper horizontal tubes 9 are respectively connected to the upper ends of the two vertical tubes 1.

[0034] A handle 10 that can rotate back and forth is movably riveted to the lower horizontal tube 9 on the front side. The handle 10 is preferably a telescopic rod, with a handle at the top for easy gripping.

[0035] It also includes a storage bag 12 with an opening at the top. The storage bag 12 has mounting holes 121 at its four corners. During installation, it is placed on the base frame, and the lower end of the pipe plug 11 passes through the mounting hole 121 and is embedded in the top of the riser 1.

[0036] The roller 2 can be used in different ways according to actual needs. One structure is that the front side with the handle rod uses a swivel wheel and the rear side uses a fixed wheel.

[0037] Example 2

[0038] like Figure 6 Another flat-folding trolley with a double-hinged base frame is shown. Unlike embodiment 1, the folding frame 3 in this embodiment includes four movable riveted X-shaped cross tubes 31.

[0039] 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 folding trolley with a double-hinged base frame, comprising four vertical tubes symmetrically distributed at the four corners, each with a roller at its bottom; a folding frame between adjacent vertical tubes on the left and right sides; and adjacent vertical tubes on the front and rear sides connected by a lower horizontal tube, characterized in that... It also includes a double-hinged base frame, which includes a central hinge, four side hinges and two base frames. A side hinge is connected to the left and right sides of the inner side of the base frame, and the front and rear sides of the central hinge are respectively hinged to the side rivets of the two base frames. The outer side of the base frame is movably connected to the lower horizontal tube on the front or rear side.

2. A folding trolley with a double-hinged base frame according to claim 1, characterized in that, The central hinge includes a central horizontal tube and two rivet joints located on the left and right sides of the central horizontal tube. The front and rear sides of the rivet joints are respectively provided with first lugs, and the side hinge is provided with second lugs. The first lugs and the second lugs are movably riveted together.

3. A folding trolley with a double-hinged base frame according to claim 2, characterized in that, The rivet joint and side rivet are U-shaped pieces with openings at the bottom.

4. A folding trolley with a double-hinged base frame according to claim 3, characterized in that, The upper wall of the rivet joint or the upper wall of the side rivet joint is provided with front baffles that are folded downwards on both the front and rear sides, or the upper surface of the rivet joint is provided with a protrusion.

5. A folding trolley with a double-hinged base frame according to claim 4, characterized in that, The rivet joint sidewall has a lower edge extending towards the center.

6. A folding trolley with a double-hinged base frame according to claim 1, characterized in that, The bottom frame includes two symmetrical side tubes and a horizontal bottom tube connecting the two side tubes. The side riveting parts are installed on the inner side of the side tubes, and the outer side of the side tubes are movably riveted to the lower horizontal tube.

7. A folding trolley with a double-hinged base frame according to claim 6, characterized in that, The lower horizontal tube is provided with a U-shaped connector on its inner side, and the outer side of the side tube extends into the U-shaped connector for movable riveting.

8. A folding trolley with a double-hinged base frame according to claim 1, characterized in that, The folding frame includes one or more movable riveted X-shaped tubes. The lower front and rear ends of the folding frame are longitudinally slidably connected to the vertical tube via a sliding seat. The upper front and rear ends of the folding frame are movablely riveted to the upper fixed seat at the top of the vertical tube.

9. A folding trolley with a double-hinged base frame according to claim 1, characterized in that, The front and rear sides are also equipped with upper horizontal tubes, and the two ends of the upper horizontal tubes are respectively connected to the upper ends of the two vertical tubes.

10. A folding trolley with a double-hinged base frame according to claim 8, characterized in that, A handle rod that can rotate back and forth is movably riveted to the lower horizontal tube on the front side.

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