Foldable trolley bottom trundle structure

Abstract

The utility model relates to the technical field of small handcart trundles, in particular to a foldable small handcart bottom trundle structure, and aims to solve the technical problems that an existing small handcart bottom trundle structure is of a fixed structure, cannot be folded and is not beneficial to storage of a small handcart. According to the technical scheme, the foldable trolley bottom trundle structure comprises a supporting plate, a first containing groove, universal wheels, common wheels, a sliding assembly and an elastic assembly; an original trundle structure fixedly installed in the bottom end of the supporting plate is changed into a sliding connection structure, the direction of the universal wheel and the direction of the common wheel are changed by rotating the sliding block, and the universal wheel and the common wheel are rotated from a vertical state to a horizontal state which is flush with the interior of the first containing groove. The universal wheels and the common wheels are folded and stored in the first storage grooves, so that the situation that the wheels in the vertical state occupy part of space when the trolley is stored is avoided, and the problem that bottom trundle structures of existing trolleys are fixed structures, cannot be folded and are not beneficial to storage of the trolleys is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheelbarrow casters, and in particular relates to a foldable wheelbarrow bottom caster structure. Background Art

[0002] Trolleys with casters at the bottom are widely used in production and life due to their low cost, simple maintenance, easy operation, light weight, etc. They are convenient for short-distance transportation of items in places where motor vehicles are inconvenient to use instead of manpower.

[0003] At present, the casters at the bottom of the existing trolleys are generally fixedly installed at the bottom of the trolley board, and the height of the four wheels occupies a part of the space. When the trolley is stored, the wheels will expand the space volume occupied by the trolley, which is not conducive to storing the trolley.

[0004] Therefore, in view of the problem that the caster structure at the bottom of the existing trolley is a fixed structure, cannot be folded, occupies part of the space, and is not conducive to the storage of the trolley, the existing caster structure at the bottom of the trolley is improved, and a foldable caster structure at the bottom of the trolley is designed, so that it can be folded and stored, thereby reducing the volume of the trolley. Utility Model Content

[0005] In order to overcome the problem that the caster structure at the bottom of the existing trolley is a fixed structure and cannot be folded, which is not conducive to the storage of the trolley.

[0006] The technical solution of the utility model is: a foldable bottom caster structure of a trolley, comprising a support plate, a No. 1 storage slot, a universal wheel, an ordinary wheel, a sliding component, and an elastic component; a No. 1 storage slot is provided at the bottom end of the support plate, a universal wheel is arranged in the No. 1 storage slot, an ordinary wheel located to the right of the universal wheel is arranged in the No. 1 storage slot, a sliding component for horizontally moving the universal wheel and the ordinary wheel is installed in the No. 1 storage slot, and an elastic component for fixing the sliding component is installed on the sliding component.

[0007] Preferably, the original caster structure fixedly installed on the bottom of the trolley is improved into a sliding assembly, and the ordinary wheels and universal wheels are rotated to a horizontal state by rotating the sliding assembly, and the ordinary wheels and universal wheels are folded and stored. The elastic assembly can fix the universal wheels and ordinary wheels in the vertical state to prevent the ordinary wheels and universal wheels from moving horizontally at the bottom of the support plate when the support plate is pushed.

[0008] Preferably, two groups of No. 1 steel beams are installed in the No. 1 storage slot, arranged from left to right and facing each other front and back. A No. 2 steel beam is welded between the two front and back No. 1 steel beams. The diagonal width of the square slider is greater than the length of the square slider. When the square slider is rotated to 45 degrees, there is a height difference between the No. 2 steel beam and the No. 1 steel beam, which will not hinder the rotating square block.

[0009] Preferably, the sliding assembly includes a limit plate and a square column; the limit plate is welded on the No. 1 steel beam, and the square columns are fixedly connected on the opposite sides of the left and right No. 1 steel beams. The limit plate can limit the moving position of the universal wheel and the ordinary wheel, and the square column can prevent the slider moved to this area from rotating, thereby preventing the universal wheel and the ordinary wheel from changing their angles.

[0010] Preferably, the sliding assembly further includes a circular column; a circular column is fixedly connected between the left and right square columns, and the cross-section of the circular column is inscribed in the cross-section of the square column. When the slider moves to the position of the circular column, the slider can be rotated to switch the universal wheel and the ordinary wheel between the vertical state and the horizontal state.

[0011] Preferably, the sliding assembly also includes a slider; the slider is sleeved on the outside of the circular column, and a through groove matching the outer diameter of the square column is opened on the inside of the slider, the through groove matches the outer diameter of the square column, and the cross-section of the circular column is in an inscribed relationship with the cross-section of the square column, so that the slider can slide left and right on the square column and the circular column conveniently.

[0012] Preferably, the bottom end of the slider located on the front side is screwed with a universal wheel by bolts, and the bottom end of the slider located on the rear side is screwed with an ordinary wheel by bolts. The ordinary wheel and the universal wheel move as the slider moves and rotate as the slider rotates. The universal wheel is responsible for changing the angle of the trolley.

[0013] Preferably, the elastic component includes a card slot and an elastic buckle; a card slot is opened on the opposite sides of the front and rear sliders, and a slide groove is opened on the opposite sides of the front and rear square columns, and an elastic buckle is installed in the slide groove. When the slider moves to the point where the card slot is concentric with the slide groove, the elastic buckle pops out of the slide groove and snaps into the card slot to be fixed due to the loss of extrusion of the inner wall of the slider.

[0014] Preferably, a group of slots penetrating the No. 1 storage slot and opposite to each other are provided on the support plate, the slots are located on the opposite side of the No. 1 steel beam, the mounting frame is fixedly connected to the slots, a handle is provided in the mounting frame, a rotating shaft penetrating the mounting frame and the handle is provided on the support plate, a No. 2 storage slot matching the handle is provided on the support plate, the mounting frame is installed in the No. 1 storage slot through the slots, and the handle can be rotated to a horizontal state and stored in the No. 2 storage slot when not in use, which will not increase the height of the support plate and reduce the space occupied by the cart when it is stored.

[0015] Preferably, a U-shaped groove is provided on the mounting frame, a fixing rod is inserted into the U-shaped groove, a spring is fixed on the fixing rod from bottom to top, the other end of the spring is fixed to the bottom of the vehicle plate, a fixing clamp matching the fixing rod is fixedly connected inside the handle, the rotating shaft passes through the fixing clamp, one side of the fixing clamp has a longer clamp foot, and the other side of the fixing clamp has a shorter clamp foot, which is convenient for clamping on the fixing rod, and when the handle is rotated to a vertical state, the fixing clamp will squeeze the fixing rod to move toward the bottom end, and when the handle is rotated to a vertical state, the fixing rod moves to the jaw position of the fixing clamp, and after the external force squeezing is lost, the spring pops out to clamp the fixing rod into the jaw of the fixing clamp, thereby fixing the handle.

[0016] Beneficial effects of the utility model:

[0017] 1. By changing the caster structure originally fixed at the bottom of the support plate to a sliding connection, the direction of the universal wheel and the ordinary wheel can be changed by rotating the slider, so that the universal wheel and the ordinary wheel can be rotated from a vertical state to a horizontal state flush with the No. 1 storage slot, and the universal wheel and the ordinary wheel can be folded and stored in the No. 1 storage slot to avoid the wheels in the vertical state occupying part of the space when the trolley is stored;

[0018] 2. When the universal wheels and ordinary wheels in the vertical state move to the corresponding positions, the elastic buckles pop out from the slots to fix the sliders, preventing the universal wheels and ordinary wheels from moving back and forth at the bottom of the support plate;

[0019] 3. A No. 2 storage slot for storing the handle is provided on the support plate. The handle can be stored therein after being rotated to avoid the problem that the vertical handle occupies a large amount of space. The fixing clamp and the elastic fixing rod can fix the vertical handle to prevent the handle from rotating at will when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The first three-dimensional structural diagram of the bottom caster structure of the foldable trolley of the utility model is shown;

[0021] Figure 2 The second three-dimensional structural schematic diagram of the bottom caster structure of the foldable trolley of the utility model is shown;

[0022] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the bottom end of the support plate of the bottom caster structure of the foldable trolley of the utility model;

[0023] Figure 4 The present invention shows a schematic diagram of the three-dimensional structure of the caster structure of the bottom of the foldable trolley;

[0024] Figure 5 The following is a schematic diagram of the three-dimensional structure of the common wheels of the bottom caster structure of the foldable trolley of the present invention;

[0025] Figure 6 The three-dimensional structure diagram of the bottom caster structure handle of the foldable trolley of the utility model is shown.

[0026] Figure 7 Shown is a schematic diagram of the three-dimensional structure of the caster structure support plate and the handle at the bottom of the foldable trolley of the present invention.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Support plate; 2. Storage slot No. 1; 3. Universal wheel; 4. Ordinary wheel; 5. Steel beam No. 1; 6. Steel beam No. 2; 701. Limiting plate; 702. Square column; 703. Round column; 704. Slider; 801. Slot; 802. Elastic buckle; 9. Mounting frame; 10. Handle; 11. Rotating shaft; 12. Storage slot No. 2; 13. Fixing rod; 14. Fixing clamp. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] See also Figure 1-2 The utility model provides an embodiment: a foldable bottom caster structure of a trolley includes a support plate 1, a No. 1 storage slot 2, a universal wheel 3, an ordinary wheel 4, a sliding component, and an elastic component; a No. 1 storage slot 2 is provided at the bottom of the support plate 1, a universal wheel 3 is arranged in the No. 1 storage slot 2, an ordinary wheel 4 located to the right of the universal wheel 3 is arranged in the No. 1 storage slot 2, a sliding component for horizontally moving the universal wheel 3 and the ordinary wheel 4 is installed in the No. 1 storage slot 2, and an elastic component for fixing the sliding component is installed on the sliding component. The original caster structure fixedly installed at the bottom of the trolley is improved into a sliding component, and the ordinary wheel 4 and the universal wheel 3 are rotated to a horizontal state by rotating the sliding component, and the ordinary wheel 4 and the universal wheel 3 are folded and stored. The elastic component can fix the universal wheel 3 and the ordinary wheel 4 in a vertical state to prevent the ordinary wheel 4 and the universal wheel 3 from moving horizontally at the bottom of the support plate 1 when the support plate 1 is pushed.

[0030] See also Figure 2-5In this embodiment, two groups of No. 1 steel beams 5 arranged from left to right and facing each other are installed in the No. 1 storage slot 2, and a No. 2 steel beam 6 is welded between the two No. 1 steel beams 5 facing each other, and the sliding assembly includes a limiting plate 701 and a square column 702; a limiting plate 701 is welded on the No. 1 steel beam 5, and a square column 702 is fixedly connected to the opposite side of the left and right No. 1 steel beams 5, and the sliding assembly includes a circular column 703; a circular column 703 is fixedly connected between the left and right square columns 702, and the cross section of the circular column 703 is inscribed in the cross section of the square column 702, and the sliding assembly also includes a slider 704; a slider 704 is sleeved on the outer side of the circular column 703, and a through groove matching the outer diameter of the square column 702 is opened on the inner side of the slider 704, and the diagonal of the square slider 704 The line width is greater than the length of the square slider 704. When the square slider 704 rotates to 45 degrees, there is a height difference between the No. 2 steel beam 6 and the No. 1 steel beam 5, which will not hinder the rotating square block. The limit plate 701 can limit the moving position of the universal wheel 3 and the ordinary wheel 4. The square column 702 can prevent the slider 704 moved to this area from rotating, and prevent the universal wheel 3 and the ordinary wheel 4 from changing their angles. When the slider 704 moves to the position of the circular column 703, the slider 704 can be rotated to switch the universal wheel 3 and the ordinary wheel 4 between the vertical state and the horizontal state. The through groove matches the outer diameter of the square column 702, and the cross-section of the circular column 703 is inscribed with the cross-section of the square column 702, which facilitates the slider 704 to slide left and right on the square column 702 and the circular column 703.

[0031] See also Figure 1-7In this embodiment, the bottom end of the slider 704 located on the front side is screwed with a universal wheel 3 by bolts, and the bottom end of the slider 704 located on the rear side is screwed with a common wheel 4 by bolts. The elastic component includes a slot 801 and an elastic buckle 802; the front and rear sliders 704 have a slot 801 on the opposite side, and the front and rear square columns 702 have a slide groove on the opposite side, and the elastic buckle 802 is installed in the slide groove. A group of notches that penetrate the No. 1 storage slot 2 and are opposite to each other are opened on the support plate 1, and the notch is located at the No. 1 steel On the opposite side of the beam 5, the mounting frame 9 is fixedly connected in the slot, a handle 10 is arranged in the mounting frame 9, a rotating shaft 11 penetrating the mounting frame 9 and the handle 10 is provided on the support plate 1, a second storage slot 12 matching the handle 10 is provided on the support plate 1, a U-shaped slot is provided on the mounting frame 9, a fixing rod 13 is inserted in the U-shaped slot, a spring from bottom to top is fixed on the fixing rod 13, the other end of the spring is fixed to the bottom of the vehicle plate, a fixing clamp 14 matching the fixing rod 13 is fixedly connected inside the handle 10, and the rotating shaft 1 1 passes through the fixing clamp 14, the ordinary wheel 4 and the universal wheel 3 move with the movement of the slider 704, and rotate with the rotation of the slider 704. The universal wheel 3 is responsible for changing the angle of the trolley. When the slider 704 moves to the concentricity of the card slot 801 and the slide slot, due to the loss of the squeezing of the inner wall of the slider 704, the elastic buckle 802 pops out from the slide slot and snaps into the card slot 801 to form a fixation. The mounting frame 9 is installed in the No. 1 storage slot 2 through the notch. The handle 10 can be rotated to a horizontal state and stored in the No. 2 storage slot when not in use. 12, the height of the support plate 1 will not be increased, and the space occupied by the trolley when it is stored is reduced. The clamp feet on one side of the fixing clamp 14 are longer, and the clamp feet on the other side are shorter, which is convenient for clamping on the fixing rod 13. In the process of rotating the handle 10 to a vertical state, the fixing clamp 14 will squeeze the fixing rod 13 to move to the bottom end. When the handle 10 is rotated to a vertical state, the fixing rod 13 moves to the jaw position of the fixing clamp 14. After the external force squeezing is lost, the spring pops out and clamps the fixing rod 13 into the jaws of the fixing clamp 14 to fix the handle.

[0032] When working, the worker first takes out the support plate 1, and then rotates the handle 10 upward. The fixing clamp 14 squeezes the fixing rod 13 during the movement, so that the fixing rod 13 moves downward. When the handle 10 is rotated to a vertical angle, the jaws of the fixing clamp 14 are directly opposite to the fixing rod 13. The fixing rod 13 loses the external force squeezing, and the elastic potential energy of the spring drives the fixing rod 13 to reset, and the fixing rod 13 is clamped into the fixing clamp 14. The handle 10 is fixed on the top of the support plate 1 in a vertical state;

[0033] Pull the slider 704 to the other side to the circular column 703 area, then rotate the slider 704 to move the universal wheel 3 and the ordinary wheel 4 to a vertical state, then push the slider 704 back, the inner wall of the slider 704 squeezes the elastic buckle 802, so that the elastic buckle 802 retracts into the slide groove opened on the square column 702, when the slider 704 moves to the corresponding position, the position of the slot 801 is opposite to the front end of the slot, the elastic buckle 802 loses the squeezing of the external force, and pops out from the slot into the slot 801 to be fixed, then turn the support plate 1 over, place the universal wheel 3 and the ordinary wheel 4 on the ground, rotate the handle 10 to a vertical state, then place the object on the support plate 1, and push the support plate 1 to move by the handle 10;

[0034] After the movement is completed, it is necessary to fold up the support plate 1, pick up the support plate 1 and turn it over, then press and hold the elastic buckle 802, press the elastic buckle 802 back into the slide groove, and then pull out the slider 704. The slider 704 replaces the finger to apply force to the elastic buckle 802, move the slider 704 to the circular column 703, and then rotate the slider 704 to make the universal wheel 3 and the ordinary wheel 4 rotate to a translation state, and then push the slider 704 back. The square column 702 fixes the slider 704, and the slider 704 cannot continue to rotate, thereby realizing the folding and storage of the universal wheel 3 and the ordinary wheel 4, and then pull the fixing rod 13 upward to separate the fixing rod 13 from the fixing clamp 14, rotate the handle 10, and rotate the handle 10 into the No. 2 storage slot 12.

[0035] Through the above steps, the caster structure originally fixedly installed in the bottom end of the support plate 1 is changed into a sliding connection, and the directions of the universal wheel 3 and the ordinary wheel 4 are changed by rotating the slider 704, so that the universal wheel 3 and the ordinary wheel 4 are rotated from a vertical state to a horizontal state flush with the No. 1 storage slot 2, and the universal wheel 3 and the ordinary wheel 4 are folded and stored in the No. 1 storage slot 2, so as to avoid the wheels in the vertical state occupying part of the space when the trolley is stored, so as to solve the problem that the caster structure at the bottom of the existing trolley is a fixed structure and cannot be folded, which is not conducive to the storage of the trolley.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A foldable bottom caster structure of a trolley, comprising a support plate (1), a first storage slot (2), a universal wheel (3), and a common wheel (4); characterized in that: The invention also comprises a sliding component and an elastic component; a No. 1 receiving groove (2) is provided at the bottom end of the support plate (1); a universal wheel (3) is arranged in the No. 1 receiving groove (2); a common wheel (4) is arranged in the No. 1 receiving groove (2) and is located to the right of the universal wheel (3); a sliding component for laterally moving the universal wheel (3) and the common wheel (4) is installed in the No. 1 receiving groove (2); and an elastic component for fixing the sliding component is installed on the sliding component.

2. A foldable bottom caster structure of a trolley according to claim 1, characterized in that: Two groups of No. 1 steel beams (5) arranged from left to right and facing each other are installed in the No. 1 storage groove (2), and a No. 2 steel beam (6) is welded between the two No. 1 steel beams (5) facing each other.

3. The foldable bottom caster structure of the trolley according to claim 2, characterized in that: The sliding assembly comprises a limiting plate (701) and a square column (702); the limiting plate (701) is welded on the No. 1 steel beam (5), and the square column (702) is fixedly connected on opposite sides of the left and right No. 1 steel beams (5).

4. The foldable bottom caster structure of the trolley according to claim 3, characterized in that: The sliding assembly further comprises a circular column (703); the circular column (703) is fixedly connected between the left and right square columns (702), and the cross section of the circular column (703) is inscribed in the cross section of the square column (702).

5. The foldable bottom caster structure of the trolley according to claim 4, characterized in that: The sliding assembly also includes a slider (704); the slider (704) is sleeved on the outside of the circular column (703), and a through groove matching the outer diameter of the square column (702) is opened on the inside of the slider (704).

6. The foldable bottom caster structure of the trolley according to claim 5, characterized in that: The bottom end of the slider (704) located at the front side is screwed with a universal wheel (3) via bolts, and the bottom end of the slider (704) located at the rear side is screwed with a common wheel (4) via bolts.

7. The foldable bottom caster structure of the trolley according to claim 6, characterized in that: The elastic component comprises a card slot (801) and an elastic card buckle (802); the card slot (801) is provided on the opposite sides of the front and rear sliding blocks (704), and the sliding groove is provided on the opposite sides of the front and rear square columns (702), and the elastic card buckle (802) is installed in the sliding groove.

8. The foldable bottom caster structure of the trolley according to claim 1, characterized in that: The support plate (1) is provided with a group of notches penetrating the first storage slot (2) and being opposite to each other on the left and right sides, the notches being located on the opposite side of the first steel beam (5), the mounting frame (9) being fixedly connected in the notches, the mounting frame (9) being provided with a handle (10), the support plate (1) being provided with a rotating shaft (11) penetrating the mounting frame (9) and the handle (10), and the support plate (1) being provided with a second storage slot (12) matching the handle (10).

9. The foldable bottom caster structure of the trolley according to claim 8, characterized in that: A U-shaped groove is provided on the mounting frame (9), a fixing rod (13) is inserted into the U-shaped groove, a spring is fixed on the fixing rod (13) from bottom to top, the other end of the spring is fixed to the bottom of the vehicle plate, a fixing clamp (14) matching the fixing rod (13) is fixedly connected inside the handle (10), and the rotating shaft (11) passes through the fixing clamp (14).

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