Flat folding trolley with adjustable space

Abstract

The utility model discloses a flat folding trolley with adjustable space, a frame comprises a front frame, a rear frame, a plurality of folding units and a hinge mechanism for connecting any two adjacent folding units, and the head folding unit and the tail folding unit are movably riveted with the front frame and the rear frame respectively; the folding unit comprises a bottom support and two side supports symmetrically distributed on the left side and the right side of the bottom support, the front end and the rear end of the bottom support are movably riveted to the hinge mechanism, the front frame or the rear frame respectively, and the bottom support comprises two bottom frames hinged to the same plane; each side support comprises one or more X-shaped cross pipes which are sequentially hinged to the same plane, the upper ends of the X-shaped cross pipes are movably riveted with the hinge mechanism and the front frame or the rear frame, the lower ends of the X-shaped cross pipes are longitudinally connected with the front frame or the rear frame or the hinge mechanism in a sliding mode, and the folding unit can be used for adjusting the size of the carrying space of the trolley and changing the occupied area of the trolley when the trolley is used.

Description

Technical Field

[0001] The utility model belongs to the technical field of trolleys, and in particular relates to a flat-folding trolley with adjustable space. Background Art

[0002] A trolley is a transport vehicle that is pushed or pulled by manpower. It can work in places where motor vehicles are inconvenient to use and is very convenient for transporting lighter items over short distances. Existing trolleys are either non-foldable or foldable. Foldable trolleys can be folded and stored when not in use. For example, a Chinese patent with publication number "CN219312839U" discloses a foldable trolley. Although this trolley occupies a smaller area when folded than when not folded, in actual use, since the size of the trolley's cargo space is fixed, and the size and quantity of the items transported each time are different, the user cannot adjust the size of the cargo space, resulting in a larger area occupied by the entire vehicle when transporting a small amount of items, which is not conducive to use in some narrow environments. Therefore, this trolley is not very flexible. Summary of the invention

[0003] The utility model aims to address the defects of the prior art and provides a flat-folding trolley with adjustable space, so that the user can adjust the size of the carrying space of the trolley and change the floor space occupied by the trolley when in use.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a flat-folding trolley with adjustable space, including a frame, the frame including a front frame, a rear frame, a plurality of folding units and a hinge mechanism connecting any two adjacent folding units, the first and last folding units are respectively movably riveted to the front frame and the rear frame; the folding unit includes a bottom bracket and two side brackets symmetrically distributed on the left and right sides of the bottom bracket, the front and rear ends of the bottom bracket are respectively movably riveted to the hinge mechanism, the front frame or the rear frame, and the bottom bracket includes two bottom frames hinged on the same plane; the side bracket includes one or more X-shaped cross tubes hinged in sequence on the same plane, the upper end of the X-shaped cross tube is movably riveted to the hinge mechanism, the front frame or the rear frame, and the lower end is longitudinally slidably connected to the front frame or the rear frame or the hinge mechanism.

[0005] Furthermore, the articulated mechanism includes two articulated cross seats, a horizontal branch pipe and two pairs of vertical branch pipes that are symmetrical on the left and right. The upper and lower ends of each pair of vertical branch pipes are respectively connected to an articulated cross seat and the end of the horizontal branch pipe. The upper ends of adjacent X-shaped cross pipes are movably riveted to the articulated cross seats, and the sliders at the lower ends are slidably connected to the vertical branch pipes.

[0006] Furthermore, the transverse branch pipes include two, the ends of the two transverse branch pipes on the same side are connected by a limit piece, and the bottoms of a pair of vertical branch pipes on the same side are respectively installed on the upper surfaces of the two transverse branch pipes.

[0007] Furthermore, a limiter for limiting the upward sliding height of the slider is installed in the middle and upper section of the vertical branch pipe.

[0008] Furthermore, the front and rear ends of the inner surface of the limiting member are provided with clamping grooves, a protrusion is provided between the two clamping grooves, and the vertical branch pipe is embedded in the clamping groove and contacts with the protrusion.

[0009] Furthermore, the front frame and the rear frame have the same structure, including two vertical tubes, a lower cross tube connecting the two vertical tubes and a roller arranged at the bottom of the vertical tube; in the first and last folding units, the slider at the lower end of the X-shaped cross tube is slidably connected to the vertical tube, and the other side of the bottom frame is movably riveted to the lower cross tube.

[0010] Furthermore, a fixing seat is provided on the top of the vertical pipe, and the upper ends of the X-shaped cross tubes adjacent to the front frame and the rear frame in the first and last folding units are movably riveted to the fixing seat.

[0011] Furthermore, the front frame or the rear frame also includes an upper cross tube, and two ends of the upper cross tube are respectively connected to the two upper fixing seats.

[0012] Furthermore, it also includes a pull rod rotatably connected to the front frame.

[0013] Furthermore, the pull rod includes a handle, an upper pull rod, a pull rod seat and two lower pull rods. The upper pull rod is slidably connected to the pull rod seat, and the upper ends of the two symmetrical lower pull rods are movably riveted to the left and right sides of the pull rod seat, and the lower ends of the two lower pull rods are movably riveted to the left and right sides of the front frame.

[0014] Furthermore, the bottom bracket also includes a bottom frame riveted part and a U-shaped part. The U-shaped parts are respectively installed at the bottom of the lower cross tube and the hinge mechanism, and one end of the bottom frame is movably riveted to the U-shaped part; the bottom frame riveted part includes two connecting parts with one end movably riveted, and the other ends of the two connecting parts are connected to the other ends of the two bottom frames.

[0015] Furthermore, universal wheels are provided on the left and right sides of the bottom of the articulated mechanism.

[0016] By adopting the technical scheme of the utility model, the beneficial effects of the utility model are as follows: when the trolley is unfolded for use, the user can adjust the loading space of the trolley according to the actual loading conditions of the goods and the conditions of the place of use, reduce the floor space of the trolley, independently adjust the size of the trolley, and use the trolley in its entirety or in part, with high flexibility and greater freedom in use; in the folding unit, since there is an articulated horizontal seat at the top of the two vertical branches in the articulated mechanism, and fixed seats are provided in the front frame and the rear frame, when folded, the upper end of the X-shaped cross tube cannot move upward, and the slider at the lower end can only slide down so that the gathered height does not exceed the height of the front frame and the rear frame when unfolded for use, and the packaging volume after being folded is small, and the use is convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a three-dimensional picture of the first type of flat-folding trolley at one angle;

[0018] Figure 2 It is a three-dimensional image of the flat-folding trolley from another angle;

[0019] Figure 3 is a side view of a flat-folding cart;

[0020] Figure 4 is a three-dimensional diagram of a flat-folding trolley in a half-folded state;

[0021] Figure 5 It is a three-dimensional picture of the flat-folding trolley in a fully folded state;

[0022] Figure 6 It is a three-dimensional diagram of the second type of flat-folding trolley;

[0023] Figure 7 is a side view of the second type of flat-folding trolley;

[0024] Figure 8 It is a three-dimensional diagram of the third type of flat-folding trolley;

[0025] Fig. 9 is a side view of the third type of flat-folding trolley;

[0026] Fig.10 It is a side view of the fourth type of flat-folding handcart.

[0027] In the figure: 1 front frame, 11 vertical tube, 12 lower cross tube, 13 upper cross tube, 14 fixed seat, 2 rear frame, 3 folding unit, 4 folding frame, 4a side bracket, 4b bottom bracket, 41 X-shaped cross tube, 42 bottom frame, 43 slider, 5 hinge mechanism, 51 hinged cross seat, 52 cross branch pipe, 53 vertical branch pipe, 54 limiter, 54a slot, 54b raised part, 6 roller, 61 universal wheel, 7 pull rod, 71 handle, 72 upper pull rod, 73 pull rod seat, 74 lower pull rod, 8 bottom frame rivet part, 9 U-shaped part. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are further described in conjunction with the accompanying drawings to make the present technical solution clearer and more understandable.

[0029] like Figure 1-10 As shown, a flat-folding trolley with adjustable space includes a frame, wherein the frame includes a front frame 1, a rear frame 2, and a plurality of folding units 3 connecting the front frame 1 and the rear frame 2, and any two adjacent folding units 3 are connected by a hinge mechanism 5. The front frame 1 and the rear frame 2 have the same structure, including two vertical pipes 11, a lower horizontal pipe 12 connecting the two vertical pipes 11, and a roller 6 arranged at the bottom of the vertical pipe 11.

[0030] The folding unit 3 of this embodiment includes a bottom bracket 4b and two side brackets 4a symmetrically distributed on the left and right sides of the bottom bracket 4b. Figure 1-3 As shown, the side bracket 4a includes an X-shaped cross tube 41 formed by riveting two side tubes, and the bottom bracket 4b is formed by riveting two bottom frames 42.

[0031] The folding unit 3 of this embodiment is independent. Two or more folding units are set during production. They can be folded separately to reduce the storage space, and then flexibly adjusted according to current usage requirements to reduce the footprint of the entire vehicle. Figure 1 The two folding units 3 shown in the figure and each side bracket 4a adopts an X-shaped cross tube 41, which can also be Figure 6-7 The three folding units 3 shown in the figure and each side bracket 4a adopts an X-shaped cross tube 41, as shown in the figure Figure 8-9 The figure shows that two folding units 3 are included and each side support 4a is composed of two X-shaped cross tubes 41 hinged on the same plane.

[0032] The front and rear sides of the upper end of the folding frame 4 are riveted to the top of the vertical pipe 11 and the top of the hinge mechanism 5 respectively, and the front and rear sides of the lower end are longitudinally slidably connected to the vertical pipe 11 and the hinge mechanism 5 respectively; the front and rear ends of the bottom bracket are riveted to the lower cross pipe 13 and the bottom of the hinge mechanism 5 respectively.

[0033] The front frame 1 and the rear frame 2 of the frame are provided with rollers 6 at the bottom. Figure 1-9 The hinge mechanism 5 shown has no rollers at the bottom. Another design is as follows Fig.10 A universal wheel 61 is provided at the bottom of the hinge mechanism 5 shown.

[0034] The articulated mechanism 5 includes an articulated cross seat 51, a cross branch pipe 52 and two parallel vertical branch pipes 53, and the upper and lower ends of the vertical branch pipes 53 are respectively connected to the articulated cross seat 51 and one end of the cross branch pipe 52; the upper end of one side of the X-shaped cross tube 41 is riveted to the articulated cross seat 51, and the lower end is slidably connected to the vertical branch pipes 53 through a slider 43.

[0035] The vertical pipe 11 is provided with a fixing seat 14 , the upper end of the other side of the X-shaped cross pipe 41 is riveted to the fixing seat 14 , and the lower end is slidably connected to the vertical pipe 11 via a slider 43 .

[0036] The front frame 1 or the rear frame 2 further includes an upper cross tube 12 , and both ends of the upper cross tube 12 are respectively connected and fixed to an upper fixing seat 14 .

[0037] The transverse branch pipe 52 includes two pipes (preferably square pipes) located on the same plane. The ends of the two transverse branch pipes 52 on the same side are fixedly connected by a stopper 54 , and the bottom of the vertical branch pipe 53 is installed on the upper surface of the transverse branch pipe 52 .

[0038] A limiter 54 for limiting the upward sliding height of the slider 43 is installed in the middle and upper section of the vertical branch pipe 53.

[0039] The inner surface of the limiting member 54 shown is provided with slots 54a on both sides, and a protrusion 54b is provided between the two slots. The outer end of the vertical branch pipe 53 or the horizontal branch pipe 52 is embedded in the slot 54a and contacts the protrusion 54b.

[0040] The bottom bracket 4b shown also includes a bottom frame rivet 8 and a U-shaped piece 9. The U-shaped piece 9 is respectively installed at the bottom of the lower cross tube 13 and the hinge mechanism 5. One end of the bottom frame 42 is riveted to the U-shaped piece 9. The bottom frame rivet 8 includes two left-right symmetrical connecting pieces. One end of the two connecting pieces is riveted. One end of the two connecting pieces is connected and fixed to the other end of the two bottom frames 42. The two bottom frames 42 are folded by the bottom frame rivet 8. The riveting involved in this embodiment is active riveting.

[0041] The flat-folding trolley also includes a pull rod 7 rotatably connected to the front frame 1. The pull rod 7 includes a handle 71, an upper pull rod 72, a pull rod seat 73 and two lower pull rods 74. The upper pull rod 72 is slidably connected to the pull rod seat 73. The upper ends of the two symmetrical lower pull rods are movably riveted to the left and right sides of the pull rod seat 73 and can rotate left and right around the pull rod seat 73. The lower ends of the two lower pull rods 74 are movably riveted to the two sides of the lower cross tube 12 (or can also be installed on two vertical tubes). The bottom of the pull rod 7 is movably riveted to the lower cross tube 12 and can rotate forward and backward, so that the pull rod 7 can be folded and stored in the front frame 1. The upper pull rod 72 can slide down along the pull rod seat to reduce the overall height of the pull rod 7, which is more conducive to storage.

[0042] The unfolded state of a flat-folding trolley is as follows: Figure 1 As shown, at this time, the cargo space is the largest and can hold the most items; when transporting fewer items or using in a narrow environment, a folding unit 3 can be folded to reduce a portion of the storage space and also reduce the floor space occupied by the trolley when in use, such as Figure 4 When not in use, it can be completely folded, and all the folding units 3 are gathered together, as shown Figure 5 Since the two upper ends of the X-shaped cross tube 41 are restricted by the fixing seat 14 or the hinged cross seat 51 and cannot move upward, the X-shaped cross tube can only slide down through the lower end slider 43 when folding, so the height of the frame itself will not be higher than the height of the stand tube 11 after folding.

[0043] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A flat-folding trolley with adjustable space, comprising a frame, characterized in that: The frame comprises a front frame, a rear frame, a plurality of folding units and a hinge mechanism connecting any two adjacent folding units, and the first and last folding units are movably riveted to the front frame and the rear frame respectively; The folding unit includes a bottom bracket and two side brackets symmetrically distributed on the left and right sides of the bottom bracket. The front and rear ends of the bottom bracket are respectively movably riveted to the hinge mechanism, the front frame or the rear frame. The bottom bracket includes two bottom frames hinged on the same plane. The side bracket includes one or more X-shaped cross tubes hinged in sequence on the same plane, the upper end of the X-shaped cross tube is movably riveted to the hinge mechanism, the front frame or the rear frame, and the lower end is longitudinally slidably connected to the front frame or the rear frame or the hinge mechanism; The articulated mechanism includes two articulated cross seats, a cross branch pipe and two pairs of vertical branch pipes that are symmetrical on the left and right. The upper and lower ends of each pair of vertical branch pipes are respectively connected to an articulated cross seat and the end of the cross branch pipe. The upper ends of adjacent X-shaped cross pipes are movably riveted to the articulated cross seats, and the sliders at the lower ends are slidably connected to the vertical branch pipes.

2. A flat-folding trolley with adjustable space according to claim 1, characterized in that: The horizontal branch pipes include two, the ends of the two horizontal branch pipes on the same side are connected by a stopper, and the bottoms of a pair of vertical branch pipes on the same side are respectively installed on the upper surfaces of the two horizontal branch pipes; Alternatively, a limiting member for limiting the upward sliding height of the sliding block is installed in the middle and upper section of the vertical branch pipe.

3. A flat-folding trolley with adjustable space according to claim 2, characterized in that: The front and rear ends of the inner surface of the limiting member are provided with clamping grooves, a convex portion is provided between the two clamping grooves, and the vertical branch pipe is embedded in the clamping groove and contacts with the convex portion.

4. The flat-folding trolley with adjustable space according to claim 1, characterized in that: Universal wheels are arranged on the left and right sides of the bottom of the hinge mechanism.

5. A flat-folding trolley with adjustable space according to any one of claims 1 to 4, characterized in that: The front frame and the rear frame have the same structure, including two vertical tubes, a lower cross tube connecting the two vertical tubes and rollers arranged at the bottom of the vertical tubes; in the first and last folding units, the slider at the lower end of the X-shaped cross tube is slidably connected to the vertical tube, and the other side of the bottom frame is movably riveted to the lower cross tube.

6. The flat-folding trolley with adjustable space according to claim 5, characterized in that: A fixing seat is arranged on the top of the vertical pipe, and the upper ends of the X-shaped cross pipes adjacent to the front frame and the rear frame in the first and last folding units are movably riveted to the fixing seat.

7. The flat-folding trolley with adjustable space according to claim 6, characterized in that: The front frame or the rear frame also includes an upper transverse tube, and two ends of the upper transverse tube are respectively connected to two fixing seats.

8. The flat-folding trolley with adjustable space according to claim 1, characterized in that: It also includes a pull rod rotatably connected to the front frame.

9. The flat-folding trolley with adjustable space according to claim 8, characterized in that: The pull rod comprises a handle, an upper pull rod, a pull rod seat and two lower pull rods. The upper pull rod is slidably connected to the pull rod seat. The upper ends of the two symmetrical lower pull rods are movably riveted to the left and right sides of the pull rod seat. The lower ends of the two lower pull rods are movably riveted to the left and right sides of the front frame.

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