Flat folding cart

Abstract

The utility model discloses a flat folding cart which comprises a cart frame, the cart frame comprises a front frame, a rear frame, two side folding frames and a bottom folding frame, the front frame and the rear frame are symmetrical, the bottom folding frame comprises two bottom frames and a connecting seat, notches are formed in the front end and the rear end of the connecting seat, and each bottom frame comprises two bent pipes. The inner side sections of the two bent pipes are parallel to each other and are embedded into the notches to be movably connected; each side folding frame comprises one or more X-shaped cross pipes movably connected to the same plane and a set of sliding bases, the upper end of the X-shaped cross pipe on the outer side is movably connected with one sliding base, and the lower end of the X-shaped cross pipe on the outer side is movably connected with the front frame or the rear frame. And the sliding seat is longitudinally connected with the front frame or the rear frame in a sliding manner. By adopting the bottom folding frame and the side folding frame, the cart can be flatly folded and stored when not in use, and occupied space is reduced; the connecting seat is movably connected with the two bottom frames, so that the overall height of the folded bottom folding frame is reduced; the side folding frames slide up and down through the sliding seats, so that the height of the folded side folding frames is not higher than that of the frame in the unfolded state, and the height of the folded frame is not changed.

Description

Technical Field

[0001] This utility model belongs to the technical field of handcarts, specifically relating to a flat-folding handcart. Background Technology

[0002] Handcarts are mainly used in daily life for places where it is inconvenient to transport goods by motor vehicles. Common handcart structures come in various forms, including foldable and non-foldable. For example, Chinese Patent No. CN205469183U discloses a fixing structure for a foldable handcart. This foldable handcart has a central support frame, which includes two I-shaped rods and a horizontal connecting rod connecting the two I-shaped rods. The horizontal rods of the cart frame are pivotally connected to the upper and lower short rods of each I-shaped rod. The frame horizontal rods pivotally connected to the lower short rods of the I-shaped rods are connected to the I-shaped rods through a pivot member. One end of each pivot member is fixed to the frame horizontal rod, and the other end is pivotally connected to the lower short rod of the I-shaped rod. Each pivot member has a slot on the side facing the lower short rod. At least one of the short rods of the I-shaped rod has a pin on both sides that cooperates with the slot. When the pin is placed in the slot, the unfolded state of the two frames is fixed. When the pin is disengaged from the slot, the two frames fold relative to each other with the pivot point of each pivot member as the center. The fixed structure of this handcart changes the height of the frame when folded, making it taller in the folded state than in the unfolded state, which is 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 flat-folding trolley.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a flat-folding trolley, comprising a frame, the frame including a symmetrical front frame and a rear frame, two side folding frames and a bottom folding frame, the bottom folding frame including two bottom frames and connecting seats with notches at both ends, the bottom frame including two bent tubes, the inner sections of the two bent tubes being parallel and movably connected by being embedded in the notches; the side folding frame including one or more X-shaped cross tubes movably connected on the same plane and a set of sliding seats, the upper end of the outer X-shaped cross tube being movably connected to a sliding seat, and the lower end being movably connected to the front frame or the rear frame; the sliding seat being longitudinally slidably connected to the front frame or the rear frame.

[0005] Furthermore, the bottom folding frame also includes a sleeve that covers the inner sections of the two bent tubes, with the inner sections and the sleeve being movably connected and embedded in the notch.

[0006] Furthermore, the bent tube also includes a middle section and an outer section. The middle sections of the two bent tubes are distributed in a structure that is narrower inside and wider outside, and the outer sections of the two bent tubes are parallel.

[0007] Furthermore, the bottom frame also includes a bottom tube, the two ends of which are connected to the outer sections of two bent tubes.

[0008] Furthermore, the connecting seat is made of square tubing, with notches provided on the lower sides of both the front and rear ends of the square tubing.

[0009] Furthermore, the frame also includes a lower connecting tube, which is located below the bottom folding frame, and its two ends are respectively movably connected to two side folding frames.

[0010] Furthermore, the front frame includes an n-shaped bend and a lower horizontal tube, with two sliding seats longitudinally slidingly connected to two symmetrical sections of the n-shaped bend, and both ends of the lower horizontal tube connected to the two symmetrical sections of the n-shaped bend. Rollers are detachably installed on the two lower ends of the n-shaped bend. The rear frame has the same structure as the front frame.

[0011] Furthermore, the front frame's rollers are omnidirectional wheels with brakes; or the rear frame's rollers are directional wheels.

[0012] Furthermore, a tie rod is movably mounted on the lower cross tube of the front frame.

[0013] Furthermore, the pull rod is a telescopic rod.

[0014] The beneficial effects of this utility model are as follows: by using a bottom folding frame and a side folding frame, the trolley can be folded flat and stored when not in use, reducing space occupation; by using the connecting seat to the two bottom frames for movable connection, the overall height of the bottom folding frame after folding is reduced; the side folding frames slide up and down through the sliding seat, so that the height after folding is not higher than the height of the frame in the unfolded state, and the height of the frame after folding does not change; the lower connecting tube connects the two side folding frames, providing auxiliary support for the bottom folding frame, enhancing the load-bearing capacity of the bottom folding frame, and improving the stability of the trolley during use. Attached Figure Description

[0015] Figure 1 It is a three-dimensional flat-folding trolley Figure 1 ;

[0016] Figure 2 It is a three-dimensional flat-folding trolley Figure 2 ;

[0017] Figure 3 This is a state diagram of the bottom folding frame;

[0018] Figure 4 This is a diagram showing the frame in its unfolded state;

[0019] Figure 5 This is a diagram of the frame in its folded state.

[0020] In the diagram: 1. Front frame, 11. N-shaped bend, 12. Lower horizontal tube, 2. Rear frame, 3. Side folding frame, 31. X-shaped cross tube, 32. Sliding seat, 4. Bottom folding frame, 41. Bending tube, 41a. Inner section, 41b. Middle section, 41c. Outer section, 42. Connecting seat, 42a. Notch, 43. Tube sleeve, 44. Bottom tube, 5. Pull rod, 51. Handle, 52. Telescopic rod, 6. Roller, 7. Lower connecting tube. Detailed Implementation

[0021] 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.

[0022] like Figure 1-5 As shown, a flat-folding trolley includes a frame, which includes a symmetrical front frame 1 and a rear frame 2, two side folding frames 3, and a bottom folding frame 4. The bottom folding frame 4 includes two bottom frames and connecting seats 42 with notches 42a at both the front and rear ends. The bottom frames include two bent tubes 41, and the inner sections 41a of the two bent tubes are parallel and movably connected in the notches 42a. The side folding frames include one or more X-shaped cross tubes 31 movably connected on the same plane and a set of sliding seats 32. The upper end of the outer X-shaped cross tube 31 is movably connected to a sliding seat 32, and the lower end is movably connected to the front frame 1 or the rear frame 2. The sliding seats 32 are longitudinally slidably connected to the front frame 1 or the rear frame 2.

[0023] The bottom folding frame 4 also includes a sleeve 43 that covers the inner sections 41a of the two bent tubes. The inner sections 41a and the sleeve 43 are movably connected by being embedded in the notch 42a. Specifically, the rivet passes through the sleeve 43 and the inner section 41a and is then movably riveted into the notch 42a.

[0024] The bent tube 41 further includes a middle section 41b and an outer section 41c. The middle sections 41b of the two bent tubes are arranged in a narrow inner and wide outer structure, and the outer sections 41c of the two bent tubes are parallel. The outer sections 41c are riveted to the lower ends of the front frame 1 and the rear frame 2. The bent tube is preferably made of square tubing.

[0025] The bottom frame also includes a bottom tube 44, the two ends of which are connected to the outer sections 41c of two bent tubes. The bent tubes 41 and the bottom tube 44 are fixedly connected in the entire bottom frame, and the inner side is fitted with a tube sleeve 43. The two bottom frames are symmetrically and movably riveted and assembled on the connecting seat 42, completing the independent assembly of the entire bottom folding frame.

[0026] In this embodiment, the connecting seat 42 is a square tube, and the notches 42a are provided on the lower sides of the front and rear ends of the square tube.

[0027] The frame also includes a lower connecting tube 7, which is located below the bottom folding frame 4. Both ends of the lower connecting tube 7 are movably connected to two side folding frames 3. When the frame is unfolded, the lower connecting tube 7 supports the bottom folding frame, improving the stability of the trolley when carrying people or goods.

[0028] The front frame 1 includes an n-shaped bend 11 and a lower horizontal tube 12. Two sliding seats 32 are longitudinally slidably connected to two symmetrical sections of the n-shaped bend 11. The two ends of the lower horizontal tube 12 are connected to the two symmetrical sections of the n-shaped bend 11. Rollers 6 are detachably installed on the two lower ends of the n-shaped bend. The rear frame 2 has the same structure as the front frame 1. The assembly of the front and rear sides is completed directly through this structure. Four X-shaped cross tubes are used for the side folding frame. Their front and rear ends are movably riveted to the sliding seats 32 on the front frame 1 and the rear frame 2, respectively. Then, the lower connecting tube 7 at the bottom is rotatably connected to the lower riveting points of the two middle X-shaped cross tubes.

[0029] The front frame 1 has casters with brakes; or the rear frame has casters with fixed wheels.

[0030] A pull rod 5 is movably mounted on the lower horizontal tube 12 of the front frame 1. The pull rod 5 is a telescopic rod 52, with a handle fixed at the top of the telescopic rod 52. The bottom of the telescopic rod 52 is rotatably connected to the lower horizontal tube 12. Specifically, the bottom is movably riveted to the U-shaped piece above the lower horizontal tube. The entire pull rod 5 is assembled independently.

[0031] 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, characterized in that, The vehicle includes a frame, which includes a symmetrical front frame and a rear frame, two side folding frames and a bottom folding frame. The bottom folding frame includes two bottom frames and connecting seats with notches at the front and rear ends. The bottom frame includes two bent tubes, and the inner sections of the two bent tubes are parallel and movably connected by being embedded in the notches. The side folding frame includes one or more X-shaped cross tubes movably connected to the same plane and a set of sliding seats. The upper end of the outer X-shaped cross tube is movably connected to a sliding seat, and the lower end is movably connected to the front frame or the rear frame. The sliding seat is longitudinally slidably connected to the front frame or the rear frame.

2. A folding trolley according to claim 1, characterized in that, The bottom folding frame also includes a sleeve that covers the inner sections of the two bent tubes, and the inner sections together with the sleeve are movably connected by being embedded in a notch.

3. A folding trolley according to claim 1, characterized in that, The bent pipe also includes a middle section and an outer section. The middle sections of the two bent pipes are distributed with an inner narrow and outer wide structure, and the outer sections of the two bent pipes are parallel.

4. A folding trolley according to claim 3, characterized in that, The bottom frame also includes a bottom tube, the two ends of which are connected to the outer sections of two bent tubes.

5. A folding trolley according to claim 1, characterized in that, The connecting seat is made of square tube, and the notches are provided on the lower sides of both the front and rear ends of the square tube.

6. A folding trolley according to claim 1, characterized in that, The frame also includes a lower connecting tube, which is located below the bottom folding frame, and its two ends are movably connected to two side folding frames respectively.

7. A folding trolley according to claim 1, characterized in that, The front frame includes an n-shaped bend and a lower horizontal tube. Two sliding seats are longitudinally slidably connected to two symmetrical sections of the n-shaped bend. The two ends of the lower horizontal tube are connected to the two symmetrical sections of the n-shaped bend. Rollers are detachably installed on the two lower ends of the n-shaped bend. The rear frame has the same structure as the front frame.

8. A folding trolley according to claim 7, characterized in that, The front frame rollers are omnidirectional wheels with brakes; or the rear frame rollers are directional wheels.

9. A folding trolley according to claim 7, characterized in that, A tie rod is movably mounted on the lower horizontal tube of the front frame.

10. A folding trolley according to claim 9, characterized in that, The tie rod is a telescopic rod.

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