Rear door opening trailer with frame not rising

Abstract

The rear door opening trailer comprises the frame and wheels installed at the bottom of the frame, a handle frame is arranged at the front end of the frame, the frame comprises two front stand columns, two rear stand columns, a bottom folding frame and transverse folding frames on the two sides, a longitudinal folding frame is arranged at the front end of the frame, and the longitudinal folding frame is arranged at the rear end of the frame. The rear end of the frame is open and provided with the foldable opening and closing frame, the rear side of the vehicle is opened or closed by rotating the opening and closing frame, and a user can load and unload goods conveniently; the bottom folding frame, the transverse folding frame and the longitudinal folding frame are rotationally connected to the front stand column and the rear stand column and drive the front stand column and the rear stand column to be folded during folding. A telescopic first supporting rod and a foldable second supporting rod are arranged at the rear end of the frame, the first supporting rod and the second supporting rod are located at the upper end and the lower end of the frame respectively and connected to the rear stand columns on the two sides, the effect of supporting the frame is achieved, the connecting strength is enhanced, and the stability of the frame can also be improved; a locking mechanism is arranged between the opening and closing frame and the rear stand column, and the opening and closing frame is fixed through the locking mechanism after being closed.

Description

Technical Field

[0001] The utility model relates to the technical field of folding vehicles, in particular to a rear-door trailer with a frame that does not rise. Background Art

[0002] In our daily lives, we often need to move items. In many cases, this requires manual labor, which is both time-consuming and labor-intensive. Therefore, folding carts have been invented. They can be used to place large amounts of items on a cart and push or pull them to their destination. Furthermore, folding carts can be folded, so they don't take up much space when not in use.

[0003] Existing folding carts, such as Chinese patent CN218907292U, disclose the following: a cart having an unfolded state and a folded state, characterized in that the cart comprises: a frame having a accommodating space, including a horizontally arranged bottom support assembly, a connecting assembly arranged at a corner position of the frame, and a side guard assembly arranged between two adjacent connecting assemblies and enclosed with the bottom support assembly to form the accommodating space; a handle assembly, including a lower handlebar and an upper handlebar connected in a rotatable manner, the lower handlebar being rotatably connected to the frame, and in the folded state, each of the side guard assemblies is folded and close to each other, and a storage space is formed at the top of the frame, and the upper handlebar is rotatably placed in the storage space.

[0004] The rear end of the folding cart cannot be opened. When loading and unloading heavy goods, the user needs to lift the goods to a high height and slowly put them into the cart, which is quite laborious and the unloading is also quite troublesome. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a rear-door trailer with a frame that does not need to be raised. To solve the above technical problems, the present invention provides the following technical solutions.

[0006] A rear-door trailer with a non-elevated frame comprises a frame and wheels installed at the bottom of the frame, a handle frame is provided at the front end of the frame, the frame comprises two front columns, two rear columns, a bottom folding frame, and transverse folding frames on both sides, a longitudinal folding frame is provided at the front end of the frame, and the rear end of the frame is open and provided with a foldable opening and closing frame, and the rear side of the vehicle is opened or closed by rotating the opening and closing frame; the bottom folding frame, transverse folding frame, and longitudinal folding frame are rotatably connected to the front columns and the rear columns, and drive the front columns and the rear columns to be retracted when folded; a retractable first support rod and a foldable second support rod are provided at the rear end of the frame, and the first support rod and the second support rod are respectively located at the upper and lower ends of the frame and connected to the rear columns on both sides; a locking mechanism is provided between the opening and closing frame and the rear columns, and the opening and closing frame is fixed by the locking mechanism after being closed.

[0007] Furthermore, the frame includes at least two bottom folding frames and transverse folding frames, a connecting column is provided between the front column and the rear column, one end of two adjacent transverse folding frames and bottom folding frames is connected to the connecting column, and the other end is connected to the front column or the rear column.

[0008] Furthermore, upper and lower ends of the front column, rear column and connecting column are respectively provided with upper fixing parts and lower fixing parts, and sliders are also provided on the front column, rear column and connecting column. The upper and lower ends of the horizontal folding frame and the vertical folding frame are respectively hinged to the upper fixing parts and the sliders, and the sliders slide downward when folding; multiple ends of the bottom folding frame are hinged to the lower fixing parts at different positions.

[0009] Furthermore, the locking mechanism includes a locking block at the top of the opening and closing frame and a card slot in the upper fixing part, the card slot is located in the upper fixing inner part of the rear column; a paddle is provided on the locking block, the center axis of the paddle is connected to the locking block, and can rotate at the axis joint and rebound through a torsion spring; a pressing part is provided at one end of the paddle, and a card block protruding toward the upper fixing part is provided at the other end, and the fixing block and the locking block are engaged by snapping the card block into the card slot, and the paddle is unlocked by pressing and rotating; a guide surface is provided on one side of the card block.

[0010] Furthermore, the locking block is provided with a protruding fixing column, and the upper fixing piece is provided with a fixing hole adapted to the fixing column. When the locking block and the upper fixing piece are buckled with each other, the fixing column is buckled into the fixing hole.

[0011] Furthermore, the first support rod includes an inner rod and an outer rod, the inner rod is movably inserted into the outer rod, and a mounting piece is provided at the upper end of the rear column, and the ends of the inner rod and the outer rod are connected to the mounting piece.

[0012] Furthermore, the second support rod includes a connecting block located in the center and connecting rods on both sides of the connecting block, the inner ends of the connecting rods are hinged to the connecting block, and the outer ends are hinged to the lower fixing member.

[0013] Furthermore, the bottom folding frame includes a central connecting seat and a plurality of bottom rods, one end of the bottom rod is hinged to the connecting seat, and the other end is hinged to the lower fixing piece.

[0014] Furthermore, the horizontal folding frame includes two hinged cross frames, and the vertical folding frame also includes two hinged cross frames. The cross frames are composed of two center movable riveted rods, and the two rods are respectively hinged to the upper fixing member and the slider.

[0015] Furthermore, the opening and closing frame includes two opening and closing rods and a longitudinal folding frame installed between the two opening rods. The opening and closing rods are hinged in the lower fixing part. A slider is provided on the opening and closing rods. The upper and lower ends of the longitudinal folding frame are respectively hinged in the locking block and the slider; a connecting belt is provided between the opening and closing frame and the rear column.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The rear end of the bicycle frame of the utility model is open and is provided with a foldable opening and closing frame. The rear side of the bicycle is opened or closed by rotating the opening and closing frame. When loading and unloading heavy goods, the opening and closing frame at the rear end can be opened, which is convenient for users to load and unload goods. When transporting relatively slender items, the opening and closing frame can also be opened to increase the length of the bicycle body, which is convenient for transportation. When folding, the slider slides down and the horizontal folding frame and the vertical folding frame are retracted, so the bicycle frame does not rise after folding. The bottom folding frame is connected by a connecting column, which has a better load-bearing effect when in use.

[0018] A locking mechanism is provided between the opening and closing frame and the rear column. The opening and closing frame is fixed by the locking mechanism after it is closed. After the opening and closing frame is closed, the locking mechanism fixes the opening and closing frame to prevent the opening of the opening and closing frame during use and causing the goods to fall. When the opening and closing frame needs to be opened, the locking state of the locking mechanism is manually released to open the opening and closing frame, which is more convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The three-dimensional Figure 1 .

[0020] Figure 2 It is a side view of the present utility model.

[0021] Figure 3 It is a top view of the utility model.

[0022] Figure 4 This is a three-dimensional diagram of the upper fixing member of the present utility model.

[0023] Figure 5 It is a three-dimensional diagram of the lock of the present utility model.

[0024] Figure 6 The three-dimensional Figure 2 .

[0025] Figure numerals: 1, frame, 2, wheel, 3, front column, 4, rear column, 5, handle frame, 6, bottom folding frame, 7, horizontal folding frame, 8, vertical folding frame, 9, opening and closing frame, 10, first support rod, 11, second support rod, 12, locking mechanism, 13, connecting column, 14, upper fixing member, 15, lower fixing member, 16, slider, 17, locking block, 18, slot, 19, paddle, 20, pressing part, 21, block, 22, guide surface, 23, fixing column, 24, fixing hole, 25, inner rod, 26, outer rod, 27, mounting member, 28, connecting block, 29, connecting rod, 30, connecting seat, 31, bottom rod, 32, cross frame, 33, vehicle rod, 34, opening and closing rod, 35, connecting belt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figure 1-6 As shown, a rear-door trailer with a non-elevated frame includes a frame 1 and wheels 2 mounted on the bottom of the frame 1. A handle frame 5 is provided at the front end of the frame 1, and the trailer is driven by manually pushing and pulling the handle frame 5. The frame 1 includes two front columns 3, two rear columns 4, a plurality of bottom folding frames 6, and a plurality of transverse folding frames 7 on both sides. A longitudinal folding frame 8 is provided at the front end of the frame 1, and the rear end of the frame 1 is open and provided with a foldable opening and closing frame 9. By rotating the opening and closing frame 9, the rear side of the trailer can be opened or closed, which facilitates the loading and unloading of heavy or fragile goods. The bottom folding frame 6, transverse folding frame 7, and longitudinal folding frame 8 are rotatably connected to the front columns 3 and rear columns 4. When folded, they drive the front columns 3 and rear columns 4 to be folded together for easy storage. When not in use, they occupy a small area and are convenient for users to carry.

[0028] The rear end of the frame 1 is provided with a retractable first support rod 10 and a foldable second support rod 11. The first support rod 10 and the second support rod 11 are respectively located at the upper and lower ends of the frame 1 and are connected to the rear columns 4 on both sides, which support the frame 1, strengthen the connection strength of the frame 1, and increase the stability of the frame 1. When the frame 1 is folded, the first support rod 10 at the upper end is retracted, and the second support rod is retracted, which reduces the volume after folding. A locking mechanism 12 is provided between the opening and closing frame 9 and the rear column 4. After the opening and closing frame 9 is closed, it is fixed by the locking mechanism 12 to prevent the opening of the opening and closing frame 9 during use from causing the goods to fall. When the opening and closing frame 9 needs to be opened, the locking mechanism 12 is moved to release the limit state with the opening and closing frame 9, and then it can be opened, which is more convenient to operate.

[0029] Example 1, as Figure 1 As shown, two bottom folding frames 6 are installed at the bottom of the frame 1, and two transverse folding frames 7 and a connecting column 12 located between the front column 3 and the rear column 4 are installed on both sides of the frame 1. One end of the two adjacent transverse folding frames 7 and the bottom folding frames 6 is connected to the connecting column 12, and the other end is connected to the front column 3 or the rear column 4. The transverse folding frame 7 is composed of two cross frames 32 hinged together.

[0030] Example 2, as Figure 6As shown, three bottom folding frames 6 are installed at the bottom of the frame 1, and three transverse folding frames 7 and two connecting rods 12 located between the front column 3 and the rear column 4 are installed on both sides of the frame 1. One end of the two transverse folding frames 7 and the bottom folding frames 6 located at both ends are connected to the connecting column 12, and the other end is connected to the front column 3 or the rear column 4. The two ends of the transverse folding frame 7 and the bottom folding frame 6 located in the middle are respectively connected to two connecting columns 12 at different positions. The transverse folding frame 7 is folded by a cross frame 32.

[0031] The upper and lower ends of the front column 3, the rear column 4 and the connecting column 13 are respectively provided with an upper fixing part 14 and a lower fixing part 15. The front column 3, the rear column 4 and the connecting column 13 are also provided with a slider 16, which can slide between the upper fixing part 14 and the lower fixing part 15. The upper and lower ends of the horizontal folding frame 7 and the vertical folding frame 8 are respectively hinged to the upper fixing part 14 and the slider 16, and the upper end is fixed by the upper fixing part 14. When folding, folding is achieved by sliding the slider 16 downward; the four ends of the bottom folding frame 6 are hinged to the lower fixing parts 15 at different positions, and rotation and folding are achieved by hinged means, and the structure is relatively simple.

[0032] The locking mechanism 12 includes a locking block 17 at the top of the opening and closing frame 9 and a slot 18 within the upper fixing member 14. The slot 18 is located within the upper fixing member 14 of the rear pillar 4. A paddle 19 is mounted on the locking block 17. The paddle 19 is centrally connected to the locking block 17 and can rotate at the pivot point and rebound via a torsion spring. One end of the paddle 19 is provided with a pressing portion 20, and the other end is provided with a locking block 21 protruding toward the upper fixing member 14. The locking block 21 snaps into the slot 18 to engage the upper fixing member 14 with the locking block 17. The paddle 19 is unlocked by pressing and turning. Manually pressing the pressing portion 20 on the paddle 19 rotates one end of the pressing portion 20, causing the locking block 21 to rotate and disengage from the slot 18, completing the unlocking process. When the paddle 19 is released, the rebound force of the torsion spring returns it to its original position. A guide surface 22 is provided on one side of the card block 21. The guide surface 22 is an inclined surface that guides the card block 21 when it is inserted into or removed from the card slot 18. The pressing portion 20 is provided with anti-slip grooves to increase friction with the finger when pressed to prevent slipping.

[0033] The locking block 17 is provided with a raised fixing column 23, and the upper fixing piece 14 of the rear column 4 is provided with a fixing hole 24 adapted to the fixing column 23. When the locking block 17 and the upper fixing piece 14 are buckled with each other, the fixing column 23 is buckled into the fixing hole 24 to increase the connection strength. After unlocking, the opening and closing frame 9 needs to be manually pried to disengage the fixing column 23 from the fixing hole 24 to prevent the opening and closing frame 9 from automatically rotating downward and opening after unlocking.

[0034] The first support rod 10 includes an inner rod 25 and an outer rod 26. The inner rod 25 is movably inserted into the outer rod 26. A mounting member 27 is provided at the upper end of the rear pillar 4, and the ends of the inner rod 25 and outer rod 26 are connected to the mounting member 27. The second support rod 11 includes a central connecting block 28 and connecting rods 29 on either side of the connecting block 28. The inner ends of the connecting rods 29 are hinged to the connecting block 28, and the outer ends are hinged to the lower fixing member 15. When folded, the rear pillars 4 on both sides are retracted, and the upward displacement of the connecting block 28 drives the connecting rods 29 on both sides to rotate downward and move closer. The lower second support rod 11 is designed to fold upward. If the first support rod 10 is designed to fold upward, it will occupy a large space. If it is designed to fold downward, it may collide with the second support rod. Therefore, the upper first support rod 10 is designed to be telescopic to save space.

[0035] The bottom folding frame 6 includes a central connecting base 30 and four bottom rods 31. One end of the bottom rod 31 is hinged to the connecting base 30, and the other end is hinged to the lower fixing member 15. The opening of the connecting base 30 is downward. When folding, the front column 3 and the rear column are retracted, the connecting base 30 moves upward, and the bottom rods 31 rotate downward to fold and retract.

[0036] The horizontal folding frame 7 includes two cross frames 32 connected by hinges, and the longitudinal folding frame 8 also includes two cross frames 32 connected by hinges. The cross frames 32 are composed of two center movable riveted rods 33 to form an X shape. The two rods 33 are respectively hinged to the upper fixing member 14 and the slider 16. When folding, the cross frames 32 rotate at the riveted points, driving the front column 3 and the rear column 4 to move toward the center.

[0037] The opening and closing frame 9 includes two opening and closing rods 34 and a longitudinal folding frame 8 mounted between the two opening and closing rods 34. The opening and closing rods 34 are hinged in the lower fixing member 15 and can be rotated up and down to open and close. Sliders 16 are mounted on the opening and closing rods 34. The longitudinal folding frame 8 is composed of two cross frames 32. The upper and lower rods 33 of the cross frames 32 are hinged in the locking block 17 and the slider 16, respectively. When folding, the opening and closing rods 34 on both sides are retracted, the slider 16 slides, and the longitudinal folding frame 8 folds. A connecting belt 35 is installed between the opening and closing frame 9 and the rear column 4. One end of the connecting belt 35 is connected to the upper fixing member 14 and the other end is connected to the locking block 17. When the opening and closing frame 9 is fully opened, it is aligned with the bottom folding frame 6. The connecting belt 35 is also in a fully straightened state, which prevents the opening and closing frame 9 from opening too far or even touching the ground.

[0038] The handle frame 5 is hinged to the lower fixing member 15 of the front column 3 and can be rotated up and down to adapt to people of different heights.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention, and any reference numerals in the claims should not be construed as limiting the claims to which they relate.

Claims

1. A rear-door trailer with a non-elevated frame, comprising a frame and wheels mounted on the bottom of the frame, a handle frame being provided at the front end of the frame, characterized in that: The frame includes two front pillars, two rear pillars, a bottom folding frame, and transverse folding frames on both sides. The front end of the frame is provided with a longitudinal folding frame, and the rear end of the frame is open and provided with a foldable opening and closing frame, and the rear side of the vehicle is opened or closed by rotating the opening and closing frame; the bottom folding frame, the transverse folding frame, and the longitudinal folding frame are rotatably connected to the front pillars and the rear pillars, and drive the front pillars and the rear pillars to be folded when folded; the rear end of the frame is provided with a retractable first support rod and a foldable second support rod, and the first support rod and the second support rod are respectively located at the upper and lower ends of the frame and connected to the rear pillars on both sides; a locking mechanism is provided between the opening and closing frame and the rear pillars, and the opening and closing frame is fixed by the locking mechanism after being closed.

2. The rear-door trailer with a non-elevated frame according to claim 1, characterized in that: The frame includes at least two bottom folding frames and a transverse folding frame. A connecting column is provided between the front column and the rear column. One end of two adjacent transverse folding frames and bottom folding frames is connected to the connecting column, and the other end is connected to the front column or the rear column.

3. The rear-door trailer with a non-elevated frame according to claim 2, characterized in that: The upper and lower ends of the front column, rear column and connecting column are respectively provided with upper fixing parts and lower fixing parts. The front column, rear column and connecting column are also provided with sliders. The upper and lower ends of the horizontal folding frame and the vertical folding frame are respectively hinged to the upper fixing parts and the sliders. When folding, the sliders slide downward; multiple ends of the bottom folding frame are hinged to the lower fixing parts at different positions.

4. The rear-door trailer with a non-elevated frame according to claim 3, characterized in that: The locking mechanism includes a locking block at the top of the opening and closing frame and a card slot in the upper fixing part, the card slot is located in the upper fixing inner part of the rear column; a paddle is provided on the locking block, the central axis of the paddle is connected to the locking block, and can rotate at the axis joint and rebound through the torsion spring; one end of the paddle is provided with a pressing part, and the other end is provided with a card block protruding toward the upper fixing part, and the fixing block and the locking block are engaged by snapping the card block into the card slot, and the paddle is unlocked by pressing and rotating; a guide surface is provided on one side of the card block.

5. The rear-door trailer with a non-elevated frame according to claim 4, characterized in that: The locking block is provided with a raised fixing column, and the upper fixing piece is provided with a fixing hole adapted to the fixing column. When the locking block and the upper fixing piece are buckled with each other, the fixing column is buckled into the fixing hole.

6. The rear-door trailer with a non-elevated frame according to claim 3, characterized in that: The first support rod includes an inner rod and an outer rod, the inner rod can be movably inserted into the outer rod, and a mounting piece is provided at the upper end of the rear column, and the ends of the inner rod and the outer rod are connected to the mounting piece.

7. The rear-door trailer with a non-elevated frame according to claim 3, characterized in that: The second support rod includes a connecting block located in the center and connecting rods on both sides of the connecting block. The inner ends of the connecting rods are hinged to the connecting block, and the outer ends are hinged to the lower fixing member.

8. The rear-door trailer with a non-elevated frame according to claim 2, characterized in that: The bottom folding frame comprises a central connecting seat and a plurality of bottom rods, one end of the bottom rod is hinged to the connecting seat, and the other end is hinged to the lower fixing piece.

9. The rear-door trailer with a non-elevated frame according to claim 3, characterized in that: The horizontal folding frame includes two hinged cross frames, and the vertical folding frame also includes two hinged cross frames. The cross frames are composed of two center movable riveted rods, and the two rods are respectively hinged to the upper fixing member and the slider.

10. The rear-door trailer with a non-elevated frame according to claim 9, characterized in that: The opening and closing frame includes two opening and closing rods and a longitudinal folding frame installed between the two opening rods. The opening and closing rods are hinged in the lower fixing piece. A slider is provided on the opening and closing rods. The upper and lower ends of the longitudinal folding frame are respectively hinged in the locking block and the slider. A connecting belt is provided between the opening and closing frame and the rear column.

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