Lifting device of load-receiving platform

Abstract

To provide a lifting device of a load-receiving platform, which can improve strength when using the load-receiving platform also as a bumper.SOLUTION: A lifting device of a load-receiving platform is made into a storage state in which the lifting device is stored below a cargo box 19 by folding the load-receiving platform 19 with respect to the cargo box provided in a cargo vehicle. The lifting device develops the load-receiving platform 19 by being slid to the outside of the cargo vehicle from the storage state when loading / unloading a cargo and can be freely switched to a use state in which the lifting device is vertically moved by a lifting mechanism. The load-receiving platform 19 has frameworks 54, 55 which are connected to the lifting mechanism and extends along an outer end of the load-receiving platform 19 and a load- receiving plate which covers upper sides and outer end faces of the frameworks 54, 55 in the storage state.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a load-receiving platform lifting device that is provided so as to be storable under a cargo box, for example, in a freight vehicle having a cargo box. [Background technology]

[0002] The following Patent Document 1 describes a conventional loading platform lifting device. The loading platform lifting device is attached to the lower part of the rear end of the frame of a vehicle equipped with a loading platform, and can be folded and stored (contained) under the frame when traveling. When loading or unloading cargo onto the loading platform, the loading platform is slid toward the rear side of the frame and protruded, and can be raised or lowered between the height of the loading platform floor and the ground level, to assist in loading or unloading cargo or workers onto the loading platform depending on the task.

[0003] When the loading platform is folded over the base end of the loading platform in the stored position, the underside of the loading platform body faces upward. A torsion bar is attached to the underside of the loading platform body to reduce the force required to fold the loading platform body, and a cover is provided to cover the torsion bar.

[0004] The rear end surface of the cover when stored is exposed to the rear of the vehicle together with the rear end surface of the base end of the loading platform when the loading platform is stored. The base end of the loading platform exposed to the rear of the vehicle and the end surfaces of the loading platform main body including the cover form a bumper surface that functions as a bumper for the rear of the vehicle. The cover is formed in the width direction of the loading platform main body by, for example, extrusion molding. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-123620 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned load-receiving platform lifting and lowering device, as described above, the rear end surface of the cover in the stored state forms a bumper surface that functions as a bumper.

[0007] However, the cover is formed in the width direction of the load-receiving platform body by extrusion molding, and since the cover is often made of an aluminum alloy, it is easily damaged in the event of a collision or contact with another vehicle.

[0008] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a load-receiving platform lifting device that can improve the strength of the load-receiving platform when it is used also as a bumper. [Means for solving the problem]

[0009] The loading platform lifting device of the present invention is configured so that the loading platform is folded and stored beneath a loading box provided on a cargo vehicle, and when loading or unloading cargo, the loading platform is unfolded by sliding it outward from the stored state toward the outside of the cargo vehicle, and can be freely switched to a usage state in which it moves up and down using a lifting mechanism, and the loading platform, in the stored state, is characterized in that it comprises a framework connected to the lifting mechanism and extending along the outer end of the loading platform, and a loading platform plate covering the upper and outer end faces of the framework.

[0010] In the loading platform lifting device of the above configuration, when in the stored state, the loading platform also serves as a bumper for the cargo vehicle, and a framework is arranged extending along the outer edge of the loading platform, and a loading platform plate is provided to cover the upper and outer end faces of the framework. Therefore, when in the stored state, damage to the loading platform can be prevented, for example, in the event of a collision or contact with another vehicle.

[0011] In the loading platform lifting device of the present invention, the framework can be configured so that, in the stored state, when the loading platform lifting device is provided at the rear of the cargo vehicle, it extends in the vehicle width direction at the rear end of the vehicle of the loading platform, and when the loading platform lifting device is provided on the side of the cargo vehicle, it extends in the fore-and-aft direction of the vehicle at the vehicle side end of the loading platform.

[0012] In the loading platform lifting device of the above configuration, when in the stored state, the framework is arranged to extend in the vehicle width direction at the rear end of the loading platform when the loading platform lifting device is installed at the rear of the cargo vehicle, and to extend in the fore-and-aft direction of the vehicle at the vehicle side end of the loading platform when the loading platform lifting device is installed on the side of the cargo vehicle, thereby making the outer end of the loading platform strong.

[0013] In the load-receiving platform lifting device of the present invention, the framework may be configured to extend along one of the outer ends of the load-receiving platform from one end to the other end.

[0014] In the loading platform lifting device configured as described above, the framework extends along the outer ends of the loading platform from one end to the other, making the outer ends of the loading platform sturdy when in the stored state.

[0015] In the load receiving platform lifting device of the present invention, the framework, in the stored state, includes a first framework arranged to extend along the outer end of the load receiving platform, and a second framework attached to the first framework and supporting the first framework, and the second framework can extend at an angle to the extension direction of the first framework, connecting the first framework with a predetermined location inside the load receiving platform.

[0016] The load-receiving-table lifting device having the above-described configuration is configured to include a second framework that diagonally connects the first framework to a predetermined location inside the load-receiving table, making the framework strong. Effect of the Invention

[0017] According to the load-receiving platform lifting device of the present invention, since it is provided with a framework extending along the outer edge of the load-receiving platform in the stored state, it is possible to improve the strength of the load-receiving platform when it is used also as a bumper for a cargo vehicle. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side view showing a state in which a loading platform lifting device according to an embodiment of the present invention is attached to a freight vehicle. [Diagram 2]FIG. [Diagram 3] FIG. 2 is a side view showing the loading platform of the loading platform lifting device in an expanded state, in which the loading platform is shown in a solid line in a state where it is on the ground, and the loading platform is shown in a raised state in a two-dot chain line. [Figure 4] FIG. 2 is a schematic diagram showing the overall configuration of the loading platform in use. [Diagram 5] FIG. [Figure 6] FIG. 4 is an enlarged cross-sectional view of a main part showing the loading platform in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, a retractable load-receiving platform lifting / lowering device (hereinafter referred to as a load-receiving platform lifting / lowering device) according to one embodiment of the present invention will be described.

[0020] 1, the loading platform lifting device 1 is provided below the rear of a loading box B in a freight vehicle V. The loading box B may be a box-shaped box that becomes a closed space when the carrying-in entrance is closed, or may be, for example, a loading platform whose upper part is always open.

[0021] 1 shows a state in which the loading platform lifting device 1 of this embodiment is stored under the rear of a cargo box B in a cargo vehicle V, i.e., the cargo vehicle V is capable of traveling. Meanwhile, FIG. 3 is a side view showing a usage state in which the movable support member 13 of the loading platform lifting device 1 is slid from the slide front end position (forward position) to the rear of the cargo box B and reaches a predetermined slide rear end position (rear position), and then the loading platform 19 is unfolded and raised and lowered to load and unload cargo. As shown in FIG. 1, a cargo box B is mounted on a vehicle body 2 of the cargo vehicle V. A so-called underfloor storage type loading platform lifting device 1 is stored under the rear end of the vehicle body 2.

[0022] Each of the fixed support members 3, provided in a pair on the left and right sides in the vehicle width direction of the load-receiving platform lifting device 1, is made up of a slide rail 4 extending horizontally in the front-to-rear direction of the vehicle, a plurality of mounting brackets 5 (three in this embodiment) for mounting the brackets 5 to the vehicle body 2, and a connecting member 6 made of a square pipe connecting the front ends of the pair of left and right slide rails 4. The slide rails 4 and each mounting bracket 5 are fastened together with bolts and nuts 7. A support plate 8 is attached to the slide rails 4 so as to be slidable in the front-to-rear direction of the vehicle.

[0023] A cross member 9 made of a square pipe extending horizontally in the vehicle width direction penetrates the pair of left and right support plates 8, and they are welded together as one piece. Support brackets 10, 11 are welded integrally to the cross member 9 on the outer side in the vehicle width direction of the support plates 8. These support brackets 10, 11 are also provided in pairs on the left and right.

[0024] The lower parts of the pair of left and right support plates 8 are connected by a connecting member 12 made of a channel material. The support plates 8, cross members 9, support brackets 10, 11, and connecting member 12 constitute a movable support member 13 that is slidable in the fore-and-aft direction of the vehicle relative to the fixed support member 3.

[0025] An auxiliary link 14 is attached to the support bracket 10 so as to be rotatable within a certain range, and an upper arm 15 and a lift cylinder (lifting drive device) 16 are rotatably attached to this auxiliary link 14. The tip of the lift cylinder 16 is connected to a predetermined position of the upper arm 15, and applies torque to the upper arm 15 by extension and retraction. In addition, a lower arm 17 is rotatably attached to the support bracket 11. The lift cylinder 16 is, for example, a single-acting hydraulic cylinder.

[0026] The upper arm 15 and the lower arm 17 form a parallel link with a quadrangle connecting their fulcrums and points of application forming a parallelogram, and the tip side of the parallel link is raised and lowered by the extension and contraction of the lift cylinder 16. The auxiliary link 14, upper arm 15, lift cylinder 16 and lower arm 17 are provided in pair on the left and right sides and form an arm-type lifting mechanism 18 that raises and lowers the load receiving platform 19.

[0027] The load receiving platform 19 includes a main plate (base load receiving platform) 191 attached horizontally to pins 15a, 17a (see FIG. 4) arranged at the tips of the upper arm 15 and the lower arm 17, a sub-plate (front load receiving platform) 192 connected to the main plate 191 so as to be foldable and unfoldable, and a connecting part 193 connecting the main plate 191 and the sub-plate 192. The connecting part 193 has one end rotatably connected to the tip of the main plate 191 and the other end having a hinge 193a (see FIG. 4) rotatably connected to the base end of the sub-plate 192.

[0028] The load receiving platform 19 (main plate 191 and sub-plate 192) is formed by connecting a plurality of hollow aluminum alloy members 50 in parallel to form a load receiving surface (corresponding to a load receiving plate) 19A. In the stored state shown in Fig. 4, the hollow members 50 have a pair of upper and lower members 50A and 50B. The hollow members 50 are formed by extruding an aluminum alloy into a hollow plate-like body, and their overall length is approximately equal to the width of the load box B.

[0029] In particular, the main plate 191 has a hollow profile 50 as a framework extending along the outer edge of the load receiving platform 19, and is equipped with steel horizontal stiffeners (first framework) 51, vertical stiffeners 52, and inclined brackets (second framework) 53 connecting the horizontal stiffeners 51 and vertical stiffeners 52, thereby supporting the load receiving surface 19A.

[0030] 5, in the stored state, the lateral stiffener 51 is disposed at the rear of the cargo vehicle V, and is disposed at the vehicle rear end of the main plate 191. The lateral stiffener 51 extends in the vehicle width direction of the cargo receiving platform 19, and extends from one end to the other end of the cargo receiving platform 19. In this case, "from one end to the other end" refers to the right end to the left end in the vehicle width direction.

[0031] Specifically, the lateral stiffener 51 includes a central stiffener 54 in the center in the vehicle width direction and end stiffeners 55 on both sides thereof. The central stiffener 54 is disposed between vertical stiffeners 52 described below. The end stiffeners 55 are disposed in the vehicle body width direction (left and right) relative to the vertical stiffeners 52, and each end stiffener 55 is set slightly shorter than the left and right ends in the vehicle width direction.

[0032] 6, the cross section of the lateral stiffener 51 has an upper surface 51a, a lower surface 51b, and side surfaces 51c and 51d. The upper surface 51a of the lateral stiffener 51 is fixed to the rear part of the hollow section 50 by a bolt 61 (see FIG. 5).

[0033] An upper surface 51a of the lateral stiffener 51 is located rearward of the rib 56 at the rearmost end of the hollow shape material 50, and is in contact with an upper portion 50A of the hollow shape material 50 from below.

[0034] Moreover, the upper part of one side surface 51c (at the front of the vehicle) abuts from behind against the rib 56 at the rearmost end of the hollow profile 50. The other side surface 51d (at the rear of the vehicle) abuts from the front against an extension 57 that extends downward from the rear end of the load receiving surface 19A. Furthermore, a bottom surface 57a that extends toward the front of the vehicle is formed at the lower end of the extension 57, and the rear lower corner of the bottom surface 51b is slightly covered by the bottom surface 57a.

[0035] That is, the upper surface 51a of the lateral stiffener 51 is covered from above by the hollow shape material 50, and the other side surface 51d is covered from the rear by the extension portion 57. In this case, the other side surface 51d indicates the rear surface since it indicates the stored state in the vehicle.

[0036] As shown in Fig. 5, the vertical stiffeners 52 are arranged in pairs at a predetermined interval from the end in the vehicle width direction. The vertical stiffeners 52 are formed by combining sheet metal members to have a substantially rectangular tubular cross section. When in use, the vertical stiffeners 52 have a tapered shape such that the lower surface gradually approaches the rear end side relative to the horizontally extending upper surface. The hollow material 50, the main plate (base load receiving platform) 191, and the sub-plate 192 are arranged along the upper surface of the vertical stiffener 52.

[0037] In particular, in the stored state, the vertical stiffener 52 arranged on the main plate 191 extends in the vehicle front-rear direction to the rear end in the lower portion 50B of the hollow material 50. In addition, as shown in Fig. 5, a bracket 52a is integrated with the base end of the vertical stiffener 52 by welding or the like, and the vertical stiffener 52 is connected to the lifting mechanism 18 (hinge 193a) via this bracket 58.

[0038] The lower portion 50B of the hollow shape member 50 is attached by a bolt 59 passing through the upper portion of the vertical stiffener 52, so that the hollow shape member 50 and the vertical stiffener 52 are integrally formed. In addition, the upper rear portion of the vertical stiffener 52 is covered by the hollow shape member 50, and the rear end of the vertical stiffener 52 is covered from the rear by an extension portion 57.

[0039] The tilt brackets 53 are arranged in a pair on the left and right in the vehicle width direction as shown in Fig. 5. In the stored state, the tilt bracket 53 is composed of an upper surface 53a, a side surface 53b on the front side of the vehicle body, a side surface 53c on the rear side of the vehicle body, and a bottom surface 53d connecting the two side surfaces 53b, 53c to each other.

[0040] The bottom surface 53d of the inclined bracket 53 is attached at its end by bolts 60 to the outer side in the vehicle width direction of the lower surface 51b of the horizontal stiffener 51 and to a bracket 58 provided on the vertical stiffener 52 at the rear in the vehicle width direction. As a result, the horizontal stiffener 51 and the vertical stiffener 52 are connected in an oblique direction by the inclined bracket 53. That is, the inclined bracket 53 is a member added to the horizontal stiffener (first framework) 51 and supports the horizontal stiffener 51, and the inclined bracket 53 extends at an angle to the extension direction of the horizontal stiffener 51, connecting the horizontal stiffener 51 and the vertical stiffener 52 (bracket 58) located inside the load receiving platform 19. In addition, the attachment portion of the inclined bracket 53 to the lower surface 51b of the horizontal stiffener 51 is covered by the hollow member 50 at the top and the extension portion 57 at the rear.

[0041] With the above configuration, as shown in Fig. 1, the sub-plate 192 is folded onto the main plate 191 during storage. Also, as shown in Fig. 3, the sub-plate 192 is unfolded during use, forming a receiving surface 19A on the receiving platform 19 that is continuous from the upper surface of the main plate 191 to the upper surface of the sub-plate 192. Baggage to be loaded and unloaded from the cargo box B is placed on this receiving surface 19A.

[0042] When the lift cylinder 16 is driven to extend and retract with the cargo receiving surface 19A configured in this way, the cargo receiving platform 19 can be raised and lowered between a raised position (position of the imaginary line at the top of FIG. 3) where the floor surface (not shown) of the cargo box B and the cargo receiving surface 19A are at substantially the same height, and a grounded position (position of the solid line in FIG. 3) where the cargo receiving platform 19 touches the ground. As a result, cargo can be loaded and unloaded from the cargo box B of the freight vehicle V by raising and lowering the cargo receiving platform 19 behind the cargo box B.

[0043] A roller mounting plate 20 is attached to each of the pair of left and right support plates 8 so as to protrude rearward, and a guide roller 21 is rotatably attached to the rear end of the roller. The tip of the sub-plate 192 can be placed on the guide roller 21.

[0044] Next, a description will be given of the slide cylinder (front-rear drive device) 22 that slides (moves back and forth) the load-receiving platform lifting device 1 between the front position and the rear position. Fig. 3 corresponds to the state in which the slide cylinder 22 is fully contracted.

[0045] The slide cylinder 22 is composed of a pair of left and right cylinders 23 arranged between the left and right slide rails 4 in the vehicle width direction. The cylinders 23 are, for example, double-acting hydraulic cylinders. The cylinder bodies 24 of the left and right cylinders 23 are overlapped with their front and rear ends arranged in opposite front and rear directions, and are integrally connected at the front and rear positions.

[0046] With the above configuration, when the loading platform 19 stored in the freight vehicle V is used, the slide cylinder 22 is extended to slide backward and retreat to the rear position. Next, when the lift cylinder 16 is contracted, the upper arm 15 and the lower arm 17 rotate downward and the main plate 191 lands. At this time, since the tip of the sub-plate 192 is on the guide roller 21, the sub-plate 192 rotates clockwise in FIG. 3 around the connecting part 193.

[0047] Next, the sub-plate 192 is manually raised and laid horizontally behind the main plate 191. In this way, the load receiving platform 19 is deployed horizontally. In this state, by extending the lift cylinder 16, the load receiving platform 19 can be raised to the raised position shown in the upper part of Fig. 3 while maintaining the load receiving platform 19 horizontal. Furthermore, by contracting the lift cylinder 16 from the raised position, the load receiving platform 19 can be lowered to its original position.

[0048] When the lift cylinder 16 is further contracted after the lower arm 17 has landed, the load receiving platform 19 tilts so that its leading end (rear end) is lowered by the action of the auxiliary link 14, and moves along the ground as shown in the lower part of Fig. 3. This makes it possible, for example, to move a cart (luggage) with casters (not shown) from the rear to the front of the load receiving platform 19, so that the cart can be easily loaded and unloaded onto the load receiving surface 19A.

[0049] To store the load receiving platform 19, the lower arm 17 lands and the load receiving platform 19 is horizontal, and then the sub-plate 192 is raised and leaned against the guide roller 21. Next, the upper arm 15 and the lower arm 17 are raised, and the sub-plate 192 is folded onto the main plate 191 by its own weight. Then, the slide cylinder 22 is contracted, and the movable support member 13, the lifting mechanism 18 and the load receiving platform 19 are retracted to the front position, resulting in the stored state shown in FIG.

[0050] 2, a power unit 30 equipped with a control device that controls the drive of the load receiving platform lifting device 1 (specifically, the lift cylinder 16 and the slide cylinder 22) is attached to one longitudinal end of the cross member 9. In addition, a switch box 31 is attached to the other longitudinal end of the cross member 9 for outputting an operation command to lift, lower or slide the load receiving platform 19 to the control device.

[0051] Incidentally, the loading platform lifting device 1 of the cargo vehicle V in this embodiment can be freely switched between a stored state and a usage state, and in the stored state, the loading platform 19 is also used as a bumper for the cargo vehicle V. In this case, the framework extending to the outer end of the loading platform 19, i.e., in this embodiment, includes a horizontal stiffener (first framework) 51, a vertical stiffener 52, and an inclined bracket (second framework) 53 connecting the horizontal stiffener 51 and the vertical stiffener 52, and supports the loading surface 19A.

[0052] Specifically, in the stored state, the steel horizontal stiffener 51 is arranged to extend in the vehicle width direction at the vehicle rear end of the load receiving platform 19. The vertical stiffener 52 is formed into a square tube shape by combining sheet metal members, extends in the vehicle front-rear direction, and is arranged to the rear end of the load receiving platform 19. Furthermore, the inclined brackets 53 are arranged in pairs on the left and right sides of the vehicle width direction, and their ends are attached to the horizontal stiffeners 51 and the vertical stiffeners 52, and the horizontal stiffeners 51 and the vertical stiffeners 52 are connected by the inclined brackets 53. Among the horizontal stiffeners 51, the central stiffener 54 is strong because the vertical stiffeners 52 are on both sides, whereas the end stiffeners 55 are on the outside of the vertical stiffeners 52, and therefore the outer ends of the end stiffeners 55 are difficult to be strong unless there is something to support them. For this reason, the inclined brackets 53 are supported on the vertical stiffener 52 side to be strongly configured.

[0053] Therefore, when the cargo receiving platform 19 is used as a bumper for the cargo vehicle V in the stored state, the lateral stiffeners 51 can strengthen the outer end of the cargo receiving platform 19 of the cargo vehicle V, and the inclined brackets 53 further strengthen the entire framework of the lateral stiffeners 51 and the inclined brackets 53, thereby strengthening the outer end of the cargo receiving platform 19 of the cargo vehicle V.

[0054] For example, in the event of a collision or contact at the center of the vehicle width direction, the collision or contact is mainly mitigated by the center stiffener 54 of the lateral stiffener 51 that abuts against the extension portion 57 of the hollow member 50, and in the event of a collision or contact at an end side in the vehicle width direction, the collision or contact is mitigated by the end stiffener 55. This makes it possible to prevent damage to the cargo receiving platform 19. It is also possible to prevent another vehicle from running under the cargo vehicle V.

[0055] In addition, the upper surface 51a and side surfaces 51c, 51d of the horizontal stiffener 51, the upper rear and rear surfaces of the vertical stiffener 52, and the attachment portion of the inclined bracket 53 to the lower surface 51b of the horizontal stiffener 51 are covered with the aluminum alloy hollow profile 50 and extension portion 57, and are therefore less likely to rust due to deterioration over time.

[0056] Although one embodiment of the present invention has been described above, the present invention can be modified in various ways without departing from the spirit and scope of the present invention. Furthermore, the specific configurations of each part are not limited to the above embodiment.

[0057] For example, in the above embodiment, the lateral stiffener 51 is provided with the central stiffener 54 in the center in the vehicle width direction and the end stiffeners 55 on both sides at the vehicle rear end of the load receiving platform 19. However, even if the lateral stiffener 51 is only the central stiffener 54 or the end stiffeners 55, it is possible to protect the load receiving surface 19A of the cargo vehicle in the stored state.

[0058] In addition, in the above embodiment, an example was shown in which each end stiffener 55 is set slightly shorter than the left and right ends in the vehicle width direction, but the end stiffeners 55 can also be arranged to extend from the vertical stiffeners 52 to the left and right ends of the vehicle.

[0059] In the above embodiment, the framework is described as extending in the vehicle width direction at the vehicle rear end side of the cargo receiving platform 19 when provided at the rear of the cargo vehicle V in the stored state. However, when provided at the side of the cargo vehicle V in the stored state, the framework can be configured to extend in the vehicle front-rear direction at the vehicle side end side of the cargo receiving platform 19. In the case where a framework extending in the vehicle front-rear direction is provided at the vehicle side end side of the cargo receiving platform 19, it is also possible to support a framework other than the framework at a predetermined location inside the cargo receiving platform 19, for example, by passing it through the ribs of the hollow shape material 50. Alternatively, the framework can be provided both in the case where it extends in the vehicle width direction at the vehicle rear end side of the cargo receiving platform 19 and in the case where it extends in the vehicle front-rear direction at the vehicle side end side of the cargo receiving platform 19.

[0060] In the above embodiment, the cross section of the lateral stiffener 51 had an upper surface 51a, a lower surface 51b, and side surfaces 51c, 51d, as shown in FIG. 6, but is not limited to this and, for example, may not include the lower surface 51b.

[0061] In the above embodiment, the upper surface 51a of the lateral stiffener 51 is disposed rearward of the rib 56 at the rearmost end of the hollow material 50. A protrusion may be formed below the rib 56 in the vehicle width direction to withstand a collision or contact.

[0062] In the above embodiment, the lateral stiffeners 51 (central stiffeners 54, end stiffeners 55) and the hollow profile 50 are in direct contact, but it is also possible for them to come into contact via other members, for example via cushioning materials such as rubber plates.

[0063] In the above embodiment, a case has been described in which the inclined bracket 53 is disposed on the end stiffener 55. However, it is also possible to dispose an inclined bracket, which is a member supporting the central stiffener 54, on the central stiffener 54. In this case, it is also possible to omit the inclined bracket 53 supporting the end stiffener 55.

[0064] In the above embodiment, the hollow mold member 50 is formed from a plate-like body having a hollow structure, but it may be a simple plate-like body.

[0065] In the above embodiment, the load-receiving platform lifting device 1 is exemplified as an arm-type lifting mechanism 18. However, the lifting mechanism may be a vertical lifting mechanism in which a wire is attached to a lifting column erected at the rear of the cargo box B, and a link mechanism is formed on the wire to provide the load-receiving platform. [Explanation of symbols]

[0066] 1...load-receiving platform lifting device, 2...vehicle body, 15...upper arm, 15a, 17a...pin, 17...lower arm, 18...lifting mechanism, 19...load-receiving platform, 19A...load-receiving surface, 50...hollow member, 50A...upper portion, 50B...lower portion, 51...horizontal stiffener (first framework), 52...vertical stiffener, 53...inclined bracket (second framework), 54...central stiffener, 55...end stiffener, 56...rib, 57...extension, 191...main plate (base loading platform), 192...subplate (front loading platform), B...packing box, V...freight vehicle

Claims

1. A loading platform lifting device that can be switched to a usage state in which a loading platform is folded and stored under a loading box provided on a cargo vehicle, and in which the loading platform is unfolded by sliding it outward from the storage state to the outside of the cargo vehicle when loading or unloading luggage, and moves up and down by a lifting mechanism; The load receiving platform is characterized in that, in the stored state, the load receiving platform includes a framework connected to the lifting mechanism and extending along an outer end of the load receiving platform, and a load receiving plate covering an upper portion and an outer end surface of the framework, The outer end of the loading platform is When the loading platform lifting device is provided at the rear of the cargo vehicle, the loading platform lifting device is at the rear end of the cargo vehicle. When the loading platform lifting device is provided on the side of the cargo vehicle, the loading platform lifting device is at the side end based on the cargo vehicle.

2. In the stored state, When the loading platform lifting device is provided at the rear of the cargo vehicle, it extends in the front-rear direction of the vehicle, A vertical stiffener is disposed to a rear end of the load receiving platform, and the framework extends from the vertical stiffener; The loading platform lifting device of claim 1, wherein when the loading platform lifting device is installed on the side of the cargo vehicle, it is provided with a vertical stiffener extending in the vehicle width direction and positioned to the side end of the loading platform, and the framework extends from the vertical stiffener.

3. In the stored state, When the loading platform lifting device is provided at the rear of the cargo vehicle, the vertical stiffeners are arranged in a pair at a predetermined interval in the vehicle width direction, and the framework includes a central stiffener extending in the vehicle width direction between the pair of vertical stiffeners, A loading platform lifting device as described in claim 2, wherein, when the loading platform lifting device is provided on the side of the cargo vehicle, the vertical stiffeners are arranged in a pair at a predetermined distance in the fore-and-aft direction of the vehicle, and the framework is provided with a central stiffener extending in the fore-and-aft direction of the vehicle between the pair of vertical stiffeners.

4. In the stored state, the framework has: When the loading platform lifting device is provided at the rear of the cargo vehicle, an end stiffener is provided extending outward in the vehicle width direction relative to the vertical stiffener, A loading platform lifting device as described in claim 2 or claim 3, wherein when the loading platform lifting device is provided on the side of the cargo vehicle, it is provided with an end stiffener extending outward in the fore-and-aft direction of the vehicle relative to the vertical stiffener.

5. When the loading platform lifting device is provided at the rear of the cargo vehicle in the stored state, the framework extends in the vehicle width direction at the vehicle rear end side of the loading platform, A loading platform lifting device as described in any one of claims 1 to 4, wherein when the loading platform lifting device is provided on the side of the cargo vehicle, the loading platform lifting device is arranged so as to extend in the fore-and-aft direction of the vehicle at the vehicle side end side of the loading platform.

6. 6. The load-receiving platform lifting device according to claim 1, wherein the framework extends along one of the outer ends of the load-receiving platform from one end to the other end.

7. The framework includes a first framework disposed to extend along the outer edge of the load-receiving platform in the stored state, and a second framework attached to the first framework and supporting the first framework, A loading platform lifting device as described in any one of claims 1 to 6, wherein the second frame extends at an angle to the extension direction of the first frame and connects the first frame to a predetermined location inside the loading platform.

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