Loading platform lifting device

Abstract

To provide a loading platform lifting device which can prevent a sub plate from being supported in a floating state with respect to a main plate.SOLUTION: A loading platform lifting device 1 comprises: a slide rail 4 which is fixed to a cargo vehicle and extends in the horizontal direction; a loading platform 19 which has a main plate 191 and a sub plate 192, and which can select an unfolded state in which the main plate and the sub plate are unfolded side by side in the extension direction of the slide rail so as to allow a cargo to be placed thereon, and a folded state in which the sub plate is folded so as to be placed on the main plate; lifting means 18 which supports the loading platform in an ascending / descending manner; and a loading platform support part 25 which has a support upper surface for supporting the sub plate on the loading platform in the folded state. The loading platform and the loading platform support part can move in the extension direction and the loading platform support part is configured such that the height of the support upper surface can be adjusted.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, a load receiving platform lifting device as described in Patent Document 1 is known. The load receiving platform lifting device includes a load receiving platform having a main plate and a sub-plate. The load receiving platform is stored with the sub-plate folded onto the main plate. The load receiving platform lifting device also includes a support plate attached to a slide rail and slidable in the fore-and-aft direction of the vehicle by a cylinder, a roller support plate attached so as to protrude rearward from the support plate, and a guide roller rotatably attached to the rear end of the roller support plate. The guide roller is provided in a position on which the tip of the sub-plate can be placed when stored.

[0003] According to the load-receiving-table lifting device configured as above, when the load-receiving table is stored, the tip of the sub-plate folded onto the main plate can be placed on the guide roller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-64447 A Summary of the Invention [Problem to be solved by the invention]

[0005] The guide rollers described in Patent Document 1 are attached to roller support plates. However, if the height of the guide rollers is not appropriate, when the tip of the sub-plate is supported by the guide rollers, the sub-plate may be supported in a floating state relative to the main plate. In this way, when the sub-plate is floating relative to the main plate, it may not be possible to store it properly.

[0006] Therefore, an object of the present invention is to provide a loading platform lifting device that can prevent the sub-plate from being supported in a floating state relative to the main plate. [Means for solving the problem]

[0007] The loading platform lifting device of the present invention is a loading platform lifting device that can be stored under a cargo vehicle and can be raised and lowered with cargo loaded, and comprises a loading platform that is fixed to the cargo vehicle and has a slide rail extending horizontally, a main plate and a sub-plate, and can be selected between an expanded state in which the main plate and the sub-plate are expanded in line in the extension direction of the slide rail so that cargo can be loaded, and a folded state in which the sub-plate is folded so that it is placed on top of the main plate, a lifting means for supporting and raising and lowering the loading platform, and a loading platform support part having a support upper surface that supports the sub-plate in the loading platform in the folded state, and the loading platform and the loading platform support part are movable in the extension direction, and the loading platform support part is configured so that the height of the support upper surface is adjustable.

[0008] According to this configuration, since the height of the upper surface of the loading platform support part is adjustable, the height at which the loading platform support part supports the tip part of the sub-plate in the folded state can be adjusted, thereby preventing the sub-plate from floating relative to the main plate.

[0009] In addition, the loading platform support portion includes a pad portion having the support upper surface against which the sub-plate abuts in the folded state, and an adjustment portion provided below the pad portion, and the adjustment portion can include a plurality of plate-shaped members, which can make it possible to adjust the height of the support upper surface.

[0010] According to this configuration, the height of the supporting upper surface of the pad portion can be adjusted by changing the number of plate-like members, so that the height of the pad portion can be easily adjusted.

[0011] In addition, the main plate and the subplate each have a base end and a tip end that face the extension direction, the base end of the subplate is connected to the tip end of the main plate so that the subplate can rotate relative to the main plate between the folded state and the unfolded state around a horizontal direction that is approximately perpendicular to the extension direction, and the lifting means is connected to the main plate and is capable of raising and lowering the main plate, the pad portion has a horizontal portion extending horizontally to support the subplate in the folded state, and a leaning portion that supports the subplate in an intermediate state of rotation of the subplate, and the leaning portion has base end and tip end that face the extension direction, and has a base end that is positioned closer to the horizontal portion and a tip end that is positioned further away from the horizontal portion, and the tip end of the leaning portion can be configured to be downwardly inclined so that the tip end of the leaning portion is positioned lower than the base end of the leaning portion.

[0012] According to this configuration, the sub-plate can be supported by leaning against the leaning portion when the sub-plate is in the middle of pivoting between the folded state and the unfolded state.

[0013] In addition, the adjustment portion is configured to be positioned below the horizontal portion and support the horizontal portion, and the leaning portion is not supported by the adjustment portion, and the tip portion is a free end, so that it can be configured to bend when the sub-plate is leaned against it.

[0014] According to this configuration, the leaning portion can bend when the sub-plate is leaned against it, so that the leaning portion can bend and absorb the impact that occurs when the sub-plate is leaned against it. Effect of the Invention

[0015] According to the present invention, a load-receiving platform lifting device can be obtained that can prevent the sub-plate from being supported in a floating state relative to the main plate. [Brief description of the drawings]

[0016] [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. 4 is a side view showing the loading platform lifting device in a stored state. [Figure 4] 13 is a side view showing the loading platform lifting device with a movable part slid therein. FIG. [Diagram 5] FIG. 4 is a side view showing a state in which a part of the loading platform lifting device is grounded. [Figure 6] 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 state where it is on the ground by a solid line and in a state where it is raised by a two-dot chain line. [Figure 7] 4 is a side view showing a load-receiving-table support portion of the load-receiving-table lifting device. FIG. [Figure 8] FIG. [Figure 9] FIG. 11 is a side view showing a state in which a loading platform lifting device according to another embodiment of the present invention is attached to a freight vehicle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A description will be given of a loading platform lifting and lowering device 1 according to one embodiment of the present invention. In the following description, the front-rear direction and the vehicle width direction will be described based on the directions in a freight vehicle V on which the loading platform lifting and lowering device 1 is provided.

[0018] As shown in FIG. 1, the loading platform lifting device 1 according to an embodiment of the present invention is provided below the rear of a loading box B in a cargo vehicle V. The loading box B may be a box-shaped box that is a closed space when the entrance is closed, or may be a loading platform with an upper part always open. FIG. 2 shows a perspective view of the loading platform lifting device 1 according to this embodiment, and FIG. 3 shows a side view. The illustrated state shows a state in which the loading platform lifting device 1 is stored below the rear of the loading box B in the cargo vehicle V, that is, a state in which the cargo vehicle V is capable of traveling. On the other hand, FIGS. 4 to 6 are side views showing a usage state in which the moving side support member 13 of the loading platform lifting device 1 is slid from the slide front end position (forward position) in FIG. 3 to the rear of the loading box B, and then the loading platform 19 is unfolded and raised to load and unload cargo. As shown in FIG. 1, a loading box B is mounted on the vehicle body 2 of the cargo vehicle V. A so-called underfloor storage type loading platform lifting device 1 is stored below the rear end of the vehicle body 2.

[0019] 4 to 6, the pair of fixed support members 3 provided on the left and right sides in the vehicle width direction of the load-receiving platform lifting device 1 each include 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 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.

[0020] A cross member 9 made of a square pipe extending horizontally in the vehicle width direction (direction perpendicular to the extension direction of the slide rail 4) 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 of the support plates 8 in the vehicle width direction. These support brackets 10, 11 are also provided in pairs on the left and right.

[0021] 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 (see Figure 2). 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.

[0022] 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.

[0023] 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 as a pair on the left and right sides and form an arm-type lifting means 18 that raises and lowers the load receiving platform 19.

[0024] The load receiving platform 19 includes a main plate 191 (base load receiving platform) 191 attached horizontally to the tip of the upper arm 15 and the lower arm 17, a sub-plate 192 (front load receiving platform) 192 connected to the main plate 191 so as to be foldable and unfoldable, and a connecting portion 193 connecting the main plate 191 and the sub-plate 192. The connecting portion 193 has a hinge 193a whose one end is rotatably connected to the tip of the main plate 191 and whose other end is rotatably connected to the base end of the sub-plate 192. The sub-plate 192 of this embodiment is longer in the front-rear direction than the main plate 191. That is, when the sub-plate 192 is rotated relative to the main plate 191 around the connecting portion 193 and folded so that the sub-plate 192 overlaps the main plate 191, the tip of the sub-plate 192 extends forward beyond the base end of the main plate 191. In this embodiment, the sub-plate 192 is made of a metal such as an aluminum extrusion material. Furthermore, in this embodiment, the main plate 191 and the sub-plate 192 are each a single plate-shaped body.

[0025] With the above configuration, as shown in Figs. 1 to 3, the sub-plate 192 is folded onto the main plate 191 in the folded state during storage. Also, as shown in Figs. 4 to 6, the sub-plate 192 is unfolded during use, so that the cargo receiving platform 19 is in an unfolded state in which a cargo receiving surface 19a is formed that continues from the upper surface of the main plate 191 to the upper surface of the sub-plate 192. Cargo to be loaded and unloaded from the cargo box B is placed on this cargo receiving surface 19a. Also, in the stored state, the protrusion 1931 provided on the sub-plate 192 fits into the fitted portion 3a provided at the rear end of the fixed-side support member 3.

[0026] 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 (upper position in FIG. 6) 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 (lower position in FIG. 6) where the cargo receiving platform 19 is in contact with the ground. This allows cargo to 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.

[0027] Next, 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 will be described. Fig. 2 corresponds to the state in which the slide cylinder 22 is fully contracted. Figs. 4 to 6 correspond to the state in which the slide cylinder 22 is fully extended.

[0028] 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 the opposite directions to each other, and are integrally connected at the front and rear positions. Such a cylinder body 24 has a front end connected to the connecting member 6 and a rear end connected to the cylinder mounting member 21 connected to the cross member 9. Therefore, when the slide cylinder 22 is extended, the cylinder mounting member 21, the cross member 9, and the support plate 8 connected to the cross member 9 move rearward away from the connecting member 6.

[0029] The cylinder mounting member 21 is a member extending in the front-rear direction and connected at its front end to the cross member 9. A mid-front-rear portion of the cylinder mounting member 21 is supported by the connecting member 12. That is, the cylinder mounting member 21 is connected to a pair of support plates 8 via the cross member 9 and the connecting member 12. Specifically, as shown in Figs. 7 and 8, the cylinder mounting member 21 includes a mounting base 211 extending in the front-rear direction and a cylinder mounting portion 21A protruding above the mounting base 211. The cylinder mounting member 21 of this embodiment also includes, at its rear end, a load receiving platform support mounting portion 21B to which a load receiving platform support portion 25 (described later) can be attached.

[0030] The cylinder mounting part 21A is a part to which the rear end of the cylinder can be attached. The cylinder mounting part 21A in this embodiment is composed of a pair of protrusions 212 protruding upward from the mounting base 211. The cylinder mounting part 21A is provided at a midway part of the mounting base 211 in the front-rear direction. Specifically, the rear end of the slide cylinder 22 (specifically, one cylinder 23) is disposed between the pair of protrusions 212 in the cylinder mounting part 21A, and the cylinder 23 is fixed by inserting a bolt through a hole formed in the protrusions 212 and fixing with a nut, for example. Note that the configuration of the cylinder mounting part 21A is not limited to this configuration, and various configurations capable of fixing the rear end of the cylinder 23 can be adopted.

[0031] The receiving platform support mounting portion 21B is a portion to which the receiving platform support portion 25 can be attached. In this embodiment, the receiving platform support mounting portion 21B is provided at the rear end portion of the cylinder mounting member 21. Specifically, the receiving platform support mounting portion 21B includes a plate-shaped mounting plate portion 213 to which the receiving platform support portion 25 is attached, and a reinforcing portion 214 provided below the mounting plate portion 213 and reinforcing the mounting plate portion 213. The mounting plate portion 213 is a plate-shaped portion extending rearward from the cylinder mounting portion 21A. In this embodiment, a hole is formed in the mounting plate portion 213 through which a bolt serving as a fixing device 28 can be inserted.

[0032] The receiving platform support portion 25 is a portion of the receiving platform 19 that can support the sub-plate 192. Specifically, the receiving platform support portion 25 can support the tip portion of the sub-plate 192. The receiving platform support portion 25 includes a pad portion 26 that contacts the sub-plate 192 and an adjustment portion 27 that can adjust the height of the upper surface (support upper surface 261a) of the pad portion 26. The receiving platform support portion 25 is attached to the rear end portion of the cylinder mounting member 21. That is, the receiving platform support portion 25 is provided behind the slide cylinder 22 in the front-rear direction. The receiving platform support portion 25 is provided so as to be movable in the front-rear direction by the operation of the slide cylinder 22. The mounting position of the receiving platform support portion 25 is not limited to the rear end portion of the cylinder mounting member 21, and can be attached to any position, such as behind the support plate 8. The load receiving platform support portion 25 also includes a horizontal portion 261, an adjustment portion 27, and a fastener 28 for fastening the mounting plate portion 213. The fastener 28 in this embodiment is a bolt and nut.

[0033] The pad portion 26 is a portion that abuts against the tip portion of the sub-plate 192 from below and supports the sub-plate 192. The pad portion 26 is a plate-shaped portion with a bent midway portion in the front-rear direction. Specifically, the pad portion 26 includes a horizontal portion 261 that extends horizontally, and a leaning portion 262 that extends rearward from the rear end portion of the horizontal portion 261. The pad portion 26 is made of a material that is softer than the tip portion of the sub-plate 192, and is made of resin in this embodiment.

[0034] The horizontal portion 261 is a plate-like portion extending substantially horizontally. The horizontal portion 261 can support the sub-plate 192 by contacting the lower surface of the sub-plate 192 of the load receiving platform 19 in the stored state. Specifically, the horizontal portion 261 includes a support upper surface 261a that can contact the lower surface of the sub-plate 192, and a fixture attachment portion 2611 to which the fixture 28 can be attached. The support upper surface 261a is made of a material softer than the tip of the sub-plate 192, and in this embodiment, is made of resin. The fixture attachment portion 2611 is a hole that penetrates in the vertical direction and through which a bolt can be inserted. In addition, the fixture attachment portion 2611 is a hole that prevents a bolt from protruding upward from the support upper surface 261a when a bolt is inserted and a nut is attached to the inserted bolt. Specifically, the fixture attachment portion 2611 includes a through hole 2611a through which a bolt is inserted, and a recessed portion 2611b that is provided radially outward of the through hole 2611a and can accommodate a nut screwed onto the bolt. In this manner, the fixture 28 is attached so as not to protrude above the support upper surface 261a, thereby preventing interference between the fixture 28 and the subplate 192. In addition, the rear end of the horizontal portion 261 is located rearward of the rear end of the load-receiving platform support attachment portion 21B.

[0035] The leaning portion 262 is a plate-like portion extending rearward from the rear end of the horizontal portion 261. The leaning portion 262 is also a plate-like portion that is inclined so that the rear side is located downward. Specifically, the leaning portion 262 is a plate-like portion whose front end is connected to the rear end of the horizontal portion 261 and whose rear end is a free end. That is, the leaning portion 262 is a downwardly inclined portion whose end (rear end) farther from the horizontal portion 261 in the front-rear direction is located lower than the end (front end) closer to the horizontal portion 261. Furthermore, the leaning portion 262 is made of a material that can bend when the load of the sub-plate 192 is applied. Specifically, the leaning portion 262 of this embodiment is made of resin. The leaning portion 262 has a support slope 262a that is continuous with the support upper surface 261a of the horizontal portion 261. The support slope 262a is a flat surface. In this embodiment, the leaning portion 262 is integrally formed with the horizontal portion 261 .

[0036] The adjustment section 27 is a portion capable of adjusting the height of the support upper surface 261a. Specifically, the adjustment section 27 includes a plate-like member 271 provided between the pad section 26 and the load-receiving platform support attachment section 21B. In this embodiment, the adjustment section 27 is configured by stacking a plurality of plate-like members 271 (for example, three) of the same thickness. That is, the adjustment section 27 of this embodiment is capable of adjusting the height of the pad section 26 (support upper surface 261a) by changing the number of plate-like members 271. Depending on the height of the support upper surface 261a, the number of plate-like members 271 may be one.

[0037] The plate-shaped member 271 is a plate-shaped member that can be stacked vertically. Moreover, the plate-shaped member 271 is configured so that the rear end is located forward of the rear end of the horizontal portion 261 when the plate-shaped member 271 is attached below the horizontal portion 261. The plate-shaped member 271 of this embodiment is formed with a through hole 271a that penetrates in the vertical direction and through which a bolt as the fixing device 28 can be inserted. Moreover, the length from the through hole 271a to the rear end of the plate-shaped member 271 of this embodiment is shorter than the length from the through hole 2611a to the rear end of the horizontal portion 261. Therefore, when the leaning portion 262 bends, the plate-shaped member 271 can be prevented from interfering with the leaning portion 262. Moreover, the plate-shaped member 271 of this embodiment is made of an elastic body that can be compressed and restored in the vertical direction, specifically, made of rubber. Moreover, the length of the plate-shaped member 271 of this embodiment in the vehicle width direction is longer than or equal to the length of the horizontal portion 261 in the vehicle width direction. Therefore, the lower part of the horizontal portion 261 can be reliably supported.

[0038] The pad section 26 and the adjustment section 27 configured as above are fixed by the fixing device 28. Specifically, the through holes 2611a, 271a formed in the pad section 26 (horizontal section 261) and the adjustment section 27 (plate-like member 271) are overlapped, a bolt is inserted into the overlapped through hole, and a nut is tightened, so that the pad section 26 and the adjustment section 27 are fixed. In this embodiment, a bolt is inserted so as to penetrate the pad section 26, the adjustment section 27, and the load receiving platform support attachment section 21B, and fixed by a nut. In addition, if it is necessary to adjust the height of the support upper surface 261a after fixing with the fixing device 28, the fixing device 28 is removed, the number of the plate-like members 271 is adjusted, and then the fixing device 28 is attached again. In this way, since the fixing device 28 is detachable from the load receiving platform support section 25, it is easy to adjust the height of the adjustment section 27, and therefore it is easy to adjust the height of the support upper surface 261a.

[0039] According to the load receiving platform lifting device 1 as described above, the height of the supporting upper surface 261a is adjustable, so that the sub-plate 192 of the load receiving platform 19 in the folded state can be supported while preventing the sub-plate 192 from floating relative to the main plate 191.

[0040] 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.

[0041] With the above configuration, when the folded load receiving platform 19 stored in the state shown in Figs. 1 to 3 is to be used, the slide cylinder 22 is extended to slide backward and retreat to the rear position. This extension of the slide cylinder 22 moves the cylinder mounting member 21 and the lifting means 18 to the rear position. That is, the extension of the slide cylinder 22 moves the load receiving platform support part 25 attached to the cylinder mounting member 21 and the load receiving platform 19 connected to the lifting means 18 to the rear position. In this way, when moving from the front position to the rear position (or from the rear position to the front position), the load receiving platform 19 and the load receiving platform support part 25 move simultaneously, so that the tip of the subplate 192 maintains the folded state (supported by the support upper surface 261a).

[0042] After the load-receiving platform 19 moves to the rear position, the lift cylinder 16 is operated to move the load-receiving platform 19 from the folded state to an intermediate state in which the main plate 191 is lowered by the lifting means 18 and the sub-plate 192 can be unfolded. Specifically, when the lift cylinder 16 is contracted, the upper arm 15 and the lower arm 17 rotate downward, and the main plate 191 descends and lands. At this time, since the tip of the sub-plate 192 is supported by the load-receiving platform support part 25, the sub-plate 192 rotates clockwise in FIG. 5 around the connecting part 193. That is, as the main plate 191 descends, the sub-plate 192 moves from the horizontally extending folded state to an inclined state in which the base end is located downward and the tip end is located upward. Also, the tip end of the sub-plate 192 moves from the state in which it is placed on the support upper surface 261a to the rear side and is supported by the support slope 262a. In this manner, the sub-plate 192 is placed against the supporting portion 262 .

[0043] Next, the sub-plate 192 is manually raised and horizontally laid 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 above 6 where the load receiving platform 19 is maintained horizontal. Furthermore, by contracting the lift cylinder 16 from the raised position, the load receiving platform 19 can be lowered to its original position.

[0044] 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. 6. 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.

[0045] 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 leaning portion 262. That is, the load receiving platform 19 is moved from the deployed state to the intermediate state. 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, bringing the load receiving platform 19 into the folded state. Then, the slide cylinder 22 is contracted, and the movable support member 13, the lifting means 18 and the load receiving platform 19 are retracted to the front position, bringing the load receiving platform 19 into the stored state shown in FIGS. 1 to 3.

[0046] When the sub-plate 192 is leaned against the leaning portion 262, the leaning portion 262 can bend. Therefore, the leaning portion 262 can bend to absorb the impact that occurs when the sub-plate 192 is raised and leaned against the leaning portion 262. In addition, since the plate-like member 271 is an elastic body that can be compressed and restored in the vertical direction, the plate-like member 271 can elastically deform to absorb the impact that occurs when the sub-plate 192 is folded onto the main plate 191.

[0047] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

[0048] For example, although the case where the loading platform 19 is deployed to the rear of the cargo vehicle has been described, it may be configured to be deployed to the side of the vehicle. In such a configuration, the slide rail is provided to extend in the vehicle width direction.

[0049] In addition, although the loading platform support part 25 is described as being provided behind the cylinder, the present invention is not limited to this configuration. For example, a member for mounting the loading platform support part 25 may be attached to the support plate 8, and the loading platform support part 25 may be attached to the member.

[0050] Furthermore, although the case where one loading platform support portion 25 is provided has been described, two or more may be provided spaced apart in the vehicle width direction.

[0051] In addition, the loading platform support portion 25 has been described as being capable of adjusting the height of the supporting upper surface 261a by changing the number of plate-like members 271. However, the height may be adjusted by other height-adjusting mechanisms, such as providing a long hole in the vertical direction and attaching the pad portion 26 to the long hole at any desired height, or by adjusting the thickness of the pad portion 26 (horizontal portion 261).

[0052] Furthermore, the pad portion 26 is described as being made of resin, but it is not limited to resin and may be made of other materials such as metal.

[0053] In addition, the plate-like member 271 is described as being made of an elastic material and absorbing impacts applied to the pad portion 26, but it is not limited to this configuration and can also be made of a material that does not elastically deform when an impact is applied.

[0054] Further, although the adjustment unit 27 has been described as being configured by stacking a plurality of plate-like members 271 having the same thickness, it may be configured by stacking plate-like members 271 having different thicknesses, or may be configured so that the thickness can be adjusted by selecting one plate-like member 271 having an appropriate thickness from a plurality of plate-like members 271 having different thicknesses. Also, the thickness may be adjustable by making it possible to select whether or not to stack another plate on one plate.

[0055] In addition, the pad portion 26 has been described as being in the form of a plate with a bent midway portion, but the present invention is not limited to this configuration and may be in various other shapes, such as an arc-shaped upper surface extending in the direction of extension of the slide rail. In the case of an arc-shaped pad portion 26, the upper end of the arc supports the tip of the sub-plate 192 in the folded state, and the portion rearward of the upper end in the vehicle direction supports the sub-plate 192 leaned up. Furthermore, the pad portion 26 may be in the form of a substantially rectangular parallelepiped plate without the leaning portion 262. In this configuration, the side surface and outer edge of the horizontal portion 261 support the sub-plate 192 in the midway state.

[0056] Furthermore, although the leaning portion 262 has been described as being a downwardly inclined member provided on the rear side of the horizontal portion 261, the present invention is not limited to this configuration. For example, as shown in Fig. 9, the leaning portion 262 can be configured as a cylindrical member with its axis in the vehicle width direction provided at the rear end of the horizontal portion 261. When the leaning portion 262 is cylindrical, the outer circumferential surface of the leaning portion 262 can reliably come into contact with the sub-plate 192 regardless of the angle at which the sub-plate 192 is leaned.

[0057] Further, the pad portion 26 and the adjustment portion 27 are fixed with bolts and nuts in the above embodiment, but the present invention is not limited to this configuration and they may be fixed by other means such as adhesive.

[0058] Furthermore, although the loading platform 19 and the loading platform support portion 25 have been described as being moved in the fore-and-aft direction of the vehicle by the same slide cylinder 22, this is not limited to such a configuration and they may also be configured to be moved in the fore-and-aft direction of the vehicle by different slide cylinders 22.

[0059] Also, although the sub-plate 192 has been described as being a single plate-like body, it may be composed of two or more plate-like bodies and configured to be foldable and unfoldable by a hinge, etc. When configured in this way, the loading platform support portion 25 supports the front end portion of the folded sub-plate 192 in the vehicle direction. [Explanation of symbols]

[0060] 1...load-receiving platform lifting device, 2...vehicle body, 3...fixed-side support member, 4...slide rail, 5...mounting bracket, 6·12...connecting member, 7...bolt / nut, 8...support plate, 9...cross member, 10·11...support bracket, 13...movable-side support member, 14...auxiliary link, 15...upper arm, 16...lift cylinder, 17...lower arm, 18...lifting means, 19...load-receiving platform, 191...main plate, 192...subplate, 193... Connecting portion, 21...cylinder mounting member, 21A...cylinder mounting portion, 21B...load receiving platform support mounting portion, 211...mounting base, 212...projection portion, 213...mounting plate portion, 214...reinforcement portion, 22...slide cylinder, 23...cylinder, 24...cylinder body, 25...load receiving platform support portion, 26...pad portion, 261...horizontal portion, 261a...support upper surface, 262...leaning portion, 262a...support slope, 27...adjustment portion, 271...plate-shaped member, 28...fixing device

Claims

1. A loading platform lifting device that can be stored under a freight vehicle and can be raised and lowered while carrying luggage, A slide rail fixed to the freight car and extending in a horizontal direction; a load receiving platform having a main plate and a sub-plate, the platform being selectable between an expanded state in which the main plate and the sub-plate are expanded in a line in the extending direction of the slide rail so that a load can be placed thereon, and a folded state in which the sub-plate is folded so that it is placed on the main plate; A lifting means for supporting and lifting the loading platform; a load receiving platform support portion having a support upper surface for supporting the sub-plate in the folded load receiving platform, The load receiving platform and the load receiving platform support portion are movable in the extension direction, The loading platform support portion is configured so that the height of the support upper surface is adjustable, The loading platform support portion is a pad portion having the support upper surface against which the sub-plate in the folded state abuts; an adjustment portion provided below the pad portion, The adjustment portion includes a plurality of plate-shaped members, and the height of the upper support surface of the load receiving platform lifting device can be adjusted by using the plate-shaped members.

2. The main plate and the sub-plate each have a base end and a tip end that face each other in the extension direction, A base end of the subplate is connected to a tip end of the main plate so that the subplate can rotate relative to the main plate between the folded state and the unfolded state around a horizontal direction substantially perpendicular to the extension direction, the lifting means is connected to the main plate and is capable of lifting and lowering the main plate; The pad portion is A horizontal portion extending in a horizontal direction so as to support the subplate in the folded state; a support portion for supporting the subplate in a midway state of the rotation of the subplate, The loading platform lifting device of claim 1, wherein the leaning portion has a base end and a tip end that face each other in the extension direction, the base end being positioned closer to the horizontal portion and the tip end being positioned further away from the horizontal portion, and the leaning portion is configured with a downward inclination so that the tip end of the leaning portion is positioned lower than the base end of the leaning portion.

3. The adjustment portion is configured to be disposed below the horizontal portion and to support the horizontal portion, 3. The loading platform lifting device according to claim 2, wherein the supporting portion is not supported by the adjustment portion, the tip portion is a free end, and is configured to bend when the sub-plate is supported.

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