An expandable capacity cart

Abstract

This utility model discloses an expandable handcart, including a frame comprising a symmetrical front frame, a rear frame, and a base frame. The front and rear frames have identical structures, including a pair of uprights, a pair of sliding tubes, and a lower cross tube. The pair of uprights are symmetrically distributed on the left and right sides of the lower cross tube. One end of each sliding tube is located at the lower end of an upright, and the other end is slidably connected to the lower cross tube. The front and rear ends of the base frame are respectively connected to the lower cross tubes of the front and rear frames. The front and rear frames on both sides can be expanded by sliding the sliding tubes outward relative to the lower cross tubes, thereby increasing the volume of the frame. This allows users to flexibly adjust the size of the frame according to the needs of transporting goods. When folded, the sliding tubes can slide inward relative to the lower cross tubes, reducing the volume of the frame.

Description

Technical Field

[0001] This utility model belongs to the technical field of trolleys, specifically relating to an expandable handcart. Background Technology

[0002] Handcarts, as a type of manually pushed and pulled transport vehicle, are used in places where motor vehicles are inconvenient to navigate. Most existing handcarts do not have adjustable capacity during use. For example, Chinese Patent Publication No. 222372913U discloses a small handcart including a base frame. Two base frames are symmetrically arranged, with connecting parts rotatably connected to both sides of the two base frames. A crossbar is fixedly connected between the two connecting parts. A side frame is rotatably connected to the side of the base frame away from the connecting parts. A telescopic rod is connected to the middle of one side of the side frame. A symmetrical support frame is fixedly connected to one side of the side frame. Rollers are rotatably connected to the lower end of the support frame. U-shaped brackets are rotatably connected to both ends of the side frame. Two U-shaped brackets are rotatably connected, and a cloth bag is placed inside the U-shaped bracket. This existing handcart, with its base frame, side frames, and U-shaped brackets forming the frame for holding the cloth bag, has a fixed capacity during use. When the amount of goods to be transported exceeds the fixed capacity, multiple trips are required, resulting in relatively poor flexibility. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an expandable handcart.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an expandable handcart, comprising a frame, wherein the frame comprises a symmetrical front frame, a rear frame and a base frame;

[0005] The front and rear frames have the same structure, including a pair of uprights, a pair of sliding tubes, and a lower horizontal tube. The pair of uprights are symmetrically distributed on the left and right sides of the lower horizontal tube. One end of the sliding tube is located at the lower end of the upright, and the other end is slidably connected to the lower horizontal tube. The front and rear ends of the base frame are respectively connected to the lower horizontal tubes of the front and rear frames.

[0006] Furthermore, the base frame includes two base frames and a pair of connectors. The left ends of the inner sides of the two base frames are movably connected to the front and rear ends of one connector, respectively, and the right ends of the inner sides of the two base frames are movably connected to the front and rear ends of the other connector, respectively. The outer sides of the two base frames are movably connected to the lower horizontal tubes of the front frame and the rear frame.

[0007] Furthermore, the front frame also includes a pair of connecting tubes, symmetrically arranged on the side of the lower horizontal tube facing the base frame, and the outer side of the base frame is movably connected to the connecting tubes.

[0008] Furthermore, the connector includes a hollow tube that runs through the front and rear, with notches on the lower sides of the front and rear ends of the hollow tube. The inner end of the bottom frame extends into the hollow tube and is riveted. When the two bottom frames are closed, they rotate downwards to approach and converge below the notches, and the inner end of the bottom frame passes through the upper windows of the front and rear ends of the hollow tube.

[0009] Furthermore, the bottom frame includes a pair of bottom vertical tubes symmetrically distributed on the left and right and a connecting bottom tube, the connecting bottom tube being located between the two bottom vertical tubes and connected to the bottom vertical tubes; the inner end of the bottom vertical tube extends into the hollow tube and is movably riveted.

[0010] Furthermore, the front frame also includes an upper horizontal tube and an upper limit seat installed on the top of the vertical tube. In the unfolded state, the two ends of the upper horizontal tube are detachably connected to the two upper limit seats on the left and right sides. In the retracted state, the upper horizontal tube is removed from the upper limit seats.

[0011] Furthermore, the upper limit seat has a limiting groove, and the end of the upper horizontal tube is inserted into the limiting groove.

[0012] Furthermore, the upper horizontal tube is a telescopic tube.

[0013] Furthermore, the bottom of the riser is detachably equipped with rollers, and the lower cross tube of the front frame is movably equipped with a retractable handle.

[0014] Furthermore, the rollers on the front frame are omnidirectional wheels, or the rollers on the rear frame are directional wheels.

[0015] Furthermore, the frame also includes a pair of side folding frames, the upper ends of the front and rear sides of the side folding frames being movably connected to the upper end of the riser, and the lower ends of the front and rear sides of the side folding frames being longitudinally slidably connected to the riser.

[0016] The beneficial effects of this utility model are as follows: the front and rear frames on both sides can slide outward relative to the lower horizontal tube through sliding tubes to expand the frame volume, making it convenient for users to flexibly adjust the frame size according to the needs of transported goods. When folded, the sliding tubes can slide inward relative to the lower horizontal tubes to reduce the frame volume. After the front and rear frames are reduced in size, combined with the foldable side folding frames and the base frame, the packaging volume of the entire frame is effectively reduced, which is conducive to batch packaging and transportation. In the unfolded state, the upper horizontal tubes can be installed on the front and rear frames to enhance their stability. The base frame is movably connected to the two bottom frames through hollow tubes. When folded, the two bottom frames rotate and fold downward towards the hollow tubes. After folding, the hollow tubes are in a horizontal position, reducing the height of the folded base frame. The viewing window allows for intuitive and quick observation of whether the side bottom tubes and hollow tubes of the base frame are installed in place during frame assembly in the production process. Attached Figure Description

[0017] Figure 1It is a three-dimensional trolley that can be expanded. Figure 1 ;

[0018] Figure 2 It is a three-dimensional trolley that can be expanded. Figure 2 ;

[0019] Figure 3 It is a three-dimensional trolley that can be expanded. Figure 3 ;

[0020] Figure 4 This is a breakdown diagram of an expandable handcart;

[0021] Figure 5 This is a folded diagram of a trolley that can be expanded and enlarged after the top horizontal tube is removed.

[0022] In the diagram: 1. Front frame, 11. Upright tube, 12. Sliding tube, 13. Lower horizontal tube, 14. Connecting tube, 15. Upper horizontal tube, 15a. Tube plug, 16. Upper limit seat, 16a. Limiting groove, 16b. Inner side of groove, 16c. Outer side of groove, 2. Rear frame, 3. Base frame, 31. Base frame, 31a. Bottom vertical tube, 31b. Connecting bottom tube, 32. Connector, 32a. Notch, 32b. Upper side window, 4. Roller, 5. Handle, 6. Side folding frame, 61X. Cross tube, 62. Sliding seat. Detailed Implementation

[0023] 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.

[0024] like Figure 1-5 The illustrated expandable handcart includes a frame comprising a symmetrical front frame 1, a rear frame 2, and a base frame 3. The front frame 1 and rear frame 2 have identical structures, including a pair of upright tubes 11, a pair of sliding tubes 12, and a lower horizontal tube 13. The pair of upright tubes 11 are symmetrically distributed on the left and right sides of the lower horizontal tube 13. One end of each sliding tube 12 is located at the lower end of an upright tube 11, and the other end is slidably connected to the lower horizontal tube 13. The front and rear ends of the base frame 3 are respectively connected to the lower horizontal tubes 13 of the front frame 1 and the rear frame 2. The expansion of the handcart's cargo space is achieved by sliding the front and rear frames left and right, increasing its flexibility.

[0025] The base frame 3 includes two base frames 31 and a pair of connectors 32. The left ends of the inner sides of the two base frames are movably connected to the front and rear ends of one connector, and the right ends of the inner sides of the two base frames 31 are movably connected to the front and rear ends of the other connector 32. The outer sides of the two base frames 31 are movably connected to the lower horizontal tubes of the front frame 1 and the rear frame 2.

[0026] The front frame 1 also includes a pair of connecting tubes 14, which are symmetrically arranged on the side of the lower horizontal tube facing the base frame, and the outer side of the base frame is movably connected to the connecting tubes 14.

[0027] The connector 32 includes a hollow tube that runs through the front and rear. The hollow tube has notches 32a on the lower side of the front and rear ends. The inner end of the bottom frame 31 extends into the hollow tube and is riveted. When the two bottom frames 31 are closed, they rotate downwards to close together below the notches. The inner end of the bottom frame passes through the upper window 32b of the front and rear ends of the hollow tube.

[0028] The base frame 31 includes a pair of symmetrically distributed bottom vertical tubes 31a and a connecting bottom tube 31b. The connecting bottom tube 31b is located between the two bottom vertical tubes 31a and connected to them. The inner end of the bottom vertical tube 31a extends into the hollow tube and is movably riveted. The connecting bottom tube 31b includes an I-shaped tube, and the four ends of the I-shaped tube are respectively fixed to the inner sides of the two bottom vertical tubes 31a. All the tubes of the entire base frame 31 are fixedly connected together, and the two base frames 31 are symmetrically distributed front and back and movably riveted to the front and rear ends of the connector 32.

[0029] The front frame 1 also includes an upper horizontal tube 15 and an upper limit seat 16 installed on the top of the vertical tube 11. In the unfolded state, the two ends of the upper horizontal tube 15 are detachably connected to the two upper limit seats 16 on the left and right sides. In the retracted state, the upper horizontal tube 15 is removed from the upper limit seat 16.

[0030] The upper limit seat 16 has a limiting groove 16a, and the end of the upper horizontal tube 15 is inserted into the limiting groove 16a. In one structure, the limiting groove 16a is a groove connecting the inner side and the upper side. The diameter of the inner side 16b of the groove is smaller than the diameter of the outer side 16c of the groove. The end of the upper horizontal tube 15 is provided with a tube plug 15a. The end face size of the tube plug 15a is larger than the inner diameter of the groove but smaller than the outer diameter of the groove. When the frame is unfolded, the upper horizontal tube 15 is placed from top to bottom, and the end of the upper horizontal tube 15 together with the tube plug 15a is directly inserted into the limiting groove 16a.

[0031] In one embodiment, the upper horizontal tube is a telescopic tube adapted to the sliding deployment or folding of the front or rear frame.

[0032] The bottom of the riser 11 is detachably equipped with a roller 4, and the lower horizontal tube 13 of the front frame 1 is movably equipped with a retractable handle 5. The handle 5 is movably riveted to the lower horizontal tube 13 and can rotate back and forth, getting closer to or away from the front frame 1.

[0033] The rollers on the front frame 1 are omnidirectional wheels, and the rollers on the rear frame 2 are directional wheels.

[0034] The frame also includes a pair of side folding frames 6. The upper ends of the front and rear sides of the side folding frames 6 are movably connected to the upper end of the riser tube 11 via upper limit seats 16. The lower ends of the front and rear sides of the side folding frames 6 are longitudinally slidably connected to the riser tube 11 via sliding seats 62. The side folding frames 6 include one or more X-shaped cross tubes 61 that are movably hinged on the same plane.

[0035] It also includes a rectangular storage bag with a top opening, which fits the fully unfolded frame. The bottom of the rectangular storage bag rests on the frame's base, and the bag is detachably connected to the frame. Specifically, when the folding frame includes two or more X-tubes, mounting openings can be provided on the left and right outer sides of the rectangular storage bag. These openings cover the upper movable riveting area between the two X-tubes in the side folding frame. The upper edges of the front and rear sides can be detachably connected to the upper cross tube using Velcro or similar methods. The vertical edges at the four corners of the rectangular storage bag can also be detachably connected to the riser using Velcro or similar methods.

[0036] 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. An expandable handcart, characterized in that, Includes a frame, which includes a symmetrical front frame, rear frame and underframe; The front and rear frames have the same structure, including a pair of uprights, a pair of sliding tubes, and a lower horizontal tube. The pair of uprights are symmetrically distributed on the left and right sides of the lower horizontal tube. One end of the sliding tube is located at the lower end of the upright, and the other end is slidably connected to the lower horizontal tube. The front and rear ends of the base frame are respectively connected to the lower horizontal tubes of the front and rear frames.

2. The expandable handcart according to claim 1, characterized in that, The base frame includes two base frames and a pair of connectors. The left ends of the inner sides of the two base frames are movably connected to the front and rear ends of one connector, respectively, and the right ends of the inner sides of the two base frames are movably connected to the front and rear ends of the other connector, respectively. The outer sides of the two base frames are movably connected to the lower horizontal tubes of the front frame and the rear frame.

3. The expandable handcart according to claim 2, characterized in that, The front frame also includes a pair of connecting tubes, which are symmetrically arranged on the side of the lower horizontal tube facing the base frame, and the outer side of the base frame is movably connected to the connecting tubes.

4. The expandable handcart according to claim 2, characterized in that, The connector includes a hollow tube that runs through the front and rear. The hollow tube has notches on the lower sides of its front and rear ends. The inner end of the bottom frame extends into the hollow tube and is riveted. When the two bottom frames are closed, they rotate downwards to close together below the notches. The inner end of the bottom frame passes through the upper windows of the front and rear ends of the hollow tube.

5. The expandable handcart according to claim 4, characterized in that, The bottom frame includes a pair of bottom vertical tubes symmetrically distributed on the left and right and a connecting bottom tube. The connecting bottom tube is located between the two bottom vertical tubes and connected to the bottom vertical tubes. The inner end of the bottom vertical tube extends into the hollow tube and is riveted.

6. The expandable handcart according to claim 1, characterized in that, The front frame also includes an upper horizontal tube and an upper limit seat installed on the top of the vertical tube. In the unfolded state, the two ends of the upper horizontal tube are detachably connected to the two upper limit seats on the left and right sides. In the retracted state, the upper horizontal tube is removed from the upper limit seats.

7. The expandable handcart according to claim 6, characterized in that, The upper limit seat has a limiting groove, and the end of the upper horizontal tube is inserted into the limiting groove; or the upper horizontal tube is a telescopic tube.

8. The expandable handcart according to claim 1, characterized in that, The bottom of the riser is detachably equipped with rollers, and the lower cross tube of the front frame is movably equipped with a retractable handle.

9. The expandable handcart according to claim 1, characterized in that, The rollers on the front frame are omnidirectional wheels, or the rollers on the rear frame are directional wheels.

10. An expandable handcart according to any one of claims 1-9, characterized in that, The frame also includes a pair of side folding frames, the upper ends of the front and rear sides of the side folding frames are movably connected to the upper end of the riser, and the lower ends of the front and rear sides of the side folding frames are longitudinally slidably connected to the riser.

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