Aluminum ladders for loading and unloading of cargo vehicles

Abstract

The aluminum ladder for loading and unloading a cargo vehicle according to the present invention is made of aluminum and comprises support frames hinged to each other parallel to the cargo bed of the cargo vehicle, rotating frames rotatably installed at the ends of the support frames by a hinge unit, connecting frames installed at predetermined intervals on the support frames and rotating frames, and an actuator for folding or unfolding the support frames and connecting frames made of aluminum. The hinge unit comprises first and second support wing parts coupled to the lower surface and end side of the support frame and first bearing parts formed between them, third and fourth support wing parts coupled to the lower surface and end side of the connecting frame and second bearing parts formed between them, and a hinge pin that is connected using a hinge shaft while the first and second bearing parts are coupled in a mutually rotatable state.

Description

Technology Field

[0001] The present invention relates to a loading and unloading ladder, and more specifically, to a lightweight aluminum ladder for loading and unloading of a cargo vehicle, which is installed on the cargo vehicle for loading and unloading agricultural machinery, heavy equipment, etc. Background Technology

[0002] Generally, heavy equipment or agricultural machinery such as tractors, rice transplanters, and combines require loading and unloading onto cargo vehicles or trailers for movement. To this end, ladders, which are supports that connect to the ground at an angle, are used on cargo vehicles or trailers.

[0003] Korean Utility Model No. 20-0479977 discloses a ladder for a cargo truck's loading compartment, and Korean Utility Model No. 20-475578 discloses a ladder pull-out device for a truck. The disclosed pull-out device is configured to have ladder storage compartments provided on both sides of the truck's loading compartment to accommodate a pair of ladders that are installed along the length of the loading compartment on both sides of the truck's loading compartment and configured to be pull-out toward the rear of the loading compartment.

[0004] Korean Registered Patent No. 10-2323904 discloses a cargo bed ladder assembly for a truck, and Korean Registered Utility Model No. 20-0479977 discloses a mounting structure for a cylinder for a cargo bed ladder for a truck.

[0005] Korean Patent Registration No. 10-0358281 discloses a trailer equipped with a ladder storage device, and Korean Utility Model Registration No. 20-0207305 discloses a trailer equipped with a ladder and a cargo truck's loading section.

[0006] As described above, conventional ladders mounted on cargo trucks are made of steel and thus carry a relatively heavy load. This load presents a problem in that it reduces the cargo truck's payload capacity. Prior art literature

[0007] Republic of Korea Registered Utility Model No. 20-0483796, Republic of Korea Registered Utility Model No. 20-475578, Republic of Korea Registered Patent No. 10-2323904, Republic of Korea Patent Registration No. 10-0358281 The problem to be solved

[0008] The present invention aims to solve the problems described above by providing an aluminum ladder for loading and unloading cargo vehicles that can lighten the frame and improve structural strength when installing heavy equipment or agricultural machinery on a cargo vehicle or trailer.

[0009] Another objective of the present invention is to provide an aluminum ladder for loading and unloading cargo vehicles that can prevent the hinge portion from being deformed by a load by providing a hinge portion that can maintain a parallel state by means of a hinge portion for unfolding the ladder, and can increase the loading capacity of the cargo vehicle through lightweighting. means of solving the problem

[0010] The aluminum ladder for loading and unloading a cargo vehicle according to the present invention for achieving the above objective is made of aluminum and comprises support frames hinge-connected to the cargo bed of the cargo vehicle in a manner parallel to each other, rotating frames rotatably installed at the ends of the support frames by means of hinge units, connecting frames installed at predetermined intervals on the support frames and rotating frames, and actuators for folding or unfolding the support frames and connecting frames made of aluminum.

[0011] The above hinge unit comprises first and second support wing parts coupled to the lower surface and end side of the support frame, and a first bearing part formed between them, and

[0012] The third and fourth support wing parts coupled to the lower surface and end side of the connecting frame, and the second bearing parts formed between them, and

[0013] The first and second bearing parts are combined in a mutually rotatable state and are provided with a hinge pin that is connected using a hinge shaft.

[0014] In the present invention, the lower side of the hinge joint is further provided with a support unit for supporting the hinge portion of the support frame and the rotation frame when they are unfolded.

[0015] And the support frame and the rotating frame are made of aluminum profiles with support ribs formed to resist bending loads. Effects of the invention

[0016] The aluminum ladder for loading and unloading a cargo vehicle according to the present invention is made of aluminum, so it is possible to reduce weight. Furthermore, since the relatively weak hinge part can be prevented from being damaged by the load, the structural strength of the ladder made of a softer material than steel can be improved. In particular, the weight of the foldable ladder can be significantly reduced, thereby increasing the load capacity of the cargo vehicle. Brief explanation of the drawing

[0017] FIG. 1 is a perspective view of an aluminum ladder for loading and unloading a cargo vehicle according to the present invention. FIG. 2 is a perspective view showing the bottom surface of an aluminum ladder for loading and unloading a cargo vehicle illustrated in FIG. 1. FIG. 3 is an exploded perspective view of an aluminum ladder for loading and unloading a cargo vehicle shown in FIG. 1. FIG. 4 is a drawing showing the hinge part of the ladder in a folded state. FIG. 5 is a drawing showing the hinge part of the ladder in an unfolded state. Specific details for implementing the invention

[0018] The present invention relates to a ladder for loading and unloading cargo vehicles, and one embodiment is shown in FIGS. 1 to 5.

[0019] Referring to the drawings, the aluminum ladder (10) for loading and unloading a cargo vehicle according to the present invention is installed at an angle to the ground in the cargo box (100) of the cargo vehicle for loading and unloading heavy equipment, agricultural machinery, etc., and comprises support frames (11)(12) installed parallel to each other, connecting frame members (13) connecting the two at a predetermined interval, pivot frames (15)(16) installed to be folded or unfolded by the first support frames (11)(12) and hinge unit (50), and connecting frame members (13) installed between them. In addition, actuators are installed on the frame of the cargo vehicle, the support frames (11)(12), and the pivot frames (15)(16) to fold or unfold the ladder and to lift the cargo box.

[0020] Here, the support frame (11)(12), pivot frame (15)(16) and connecting frame member (13) are made of a material lighter than steel, which is made of aluminum or aluminum alloy.

[0021] The above support frame (11)(12) and pivot frame (15)(16) may be made of a profile having a reinforcing part capable of storing a load.

[0022] As shown in FIGS. 3 to 5, the hinge unit (50) comprises a first hinge member (60) having first and second support wing portions (61)(62) that are coupled to the lower surface and end side of the support frame (11)(12) and a first bearing portion (63) formed between them.

[0023] A second hinge member (70)d having third and fourth support wing portions (71)(72) that are coupled to the lower surface and end side of the rotating frame (15)(16) and second bearing portions (73) formed between them, and a hinge pin (51) that is coupled using a hinge shaft while the first and second bearing portions (63)(73) are coupled in a state where they can rotate mutually.

[0024] The first and second bearing parts (63)(73) on which the second and fourth supporting wing parts (62)(73) are installed are manufactured by injection molding of aluminum and have a structure with through holes formed to maintain thermal equilibrium so as not to shrink when cooled.

[0025] The above second and fourth support wing parts (62)(73) act as stoppers to prevent the support frames (11)(12) and rotation frames (15)(16) from sagging when unfolded.

[0026] And on the lower side of the hinge joint (50), a support unit (80) is provided to support the hinge portion of the support frame (11)(12) and the rotation frame (15)(16) when they are unfolded. The support unit has a folding structure that is linked to the support frame and the rotation frame.

[0027] As described above, the aluminum ladder (10) for loading and unloading a cargo vehicle according to the present invention can be made lightweight, so the loading capacity of the cargo vehicle's cargo box can be increased, and since the first and second support wing portions (61) (62) of the first hinge member (60) are in contact with the lower surface and front surface of the support frame, and the first and second support wing portions (71) (72) of the second hinge member (70) are in contact with the lower surface and front surface of the pivot frame, the supporting force against vertical load can be increased.

[0028] In particular, since a support unit is installed on the lower side of the installation area of ​​the hinge unit, the ability to respond to loads acting on the hinge unit area can be increased.

[0029] As explained above, the aluminum ladder for loading and unloading a cargo vehicle according to the present invention can reduce the weight installed in the cargo compartment of the cargo vehicle, thereby increasing the cargo loading capacity.

[0030] The present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

Claim 1 An aluminum ladder for loading and unloading a cargo vehicle is made of aluminum and comprises support frames hinged to each other parallel to the cargo bed of the cargo vehicle, rotating frames rotatably installed at the ends of the support frames by a hinge unit, connecting frames installed at predetermined intervals on the support frames and rotating frames, and an actuator for folding or unfolding the support frames and connecting frames made of aluminum, wherein the hinge unit comprises first and second support wing parts coupled to the lower surface and end side of the support frame and a first bearing part formed between them, third and fourth support wing parts coupled to the lower surface and end side of the connecting frame and a second bearing part formed between them, and a hinge pin that connects using a hinge shaft while the first and second bearing parts are coupled in a mutually rotatable state. Claim 2 An aluminum ladder for loading and unloading a cargo vehicle according to claim 1, further comprising a support unit for supporting the hinge portion of the support frame and the rotating frame when they are unfolded on the lower side of the installation portion of the hinge unit.

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