JP7391489B2 - Loading platform lifting device - Google Patents

Description

The present invention relates to a loading platform lifting and lowering device that raises and lowers a loading platform to support cargo handling operations on a loading platform of a vehicle, and is preferably mounted on a vehicle having a step lower than the floor surface at the rear end of the floor plate of the loading platform. The present invention relates to a loading platform elevating device that raises and lowers a loading platform using a movable arm.

A loading platform elevating device is a device that lifts and lowers a loading platform between the height of the floor surface of a vehicle loading platform and the height at which it touches the ground, and supports loading and unloading work of cargo and the like onto the vehicle loading platform. In this type of loading platform lifting/lowering device, the area of the loading platform may need to be expanded depending on the cargo to be placed on the loading platform. As a device for expanding the area of a cargo receiving platform, there is a device in which an extension receiving platform can be attached to the base of the receiving platform (Patent Document 1).

Patent No. 5714309

In a loading platform elevating device, a certain amount of clearance may be set in advance to prevent the lifting platform from coming into contact with the loading platform while moving up and down. In addition, a slight gap may unexpectedly occur between the loading platform and the loading platform when the loading platform is raised to the floor level due to, for example, manufacturing accuracy or installation accuracy. In some cases, a step called a drainer is provided at the rear end of the floor surface of the vehicle's loading platform. Therefore, such gaps and drains impede the smooth movement of the cart between the loading platform and the loading platform.

Therefore, for example, a member called a rotary and reversible road board may be installed on the loading platform of the vehicle. When the cargo platform is raised, the road board is manually turned over and protruded from the edge of the cargo platform, so that the road board is suspended between the cargo platform and the cargo platform. By passing this road board as necessary, it is possible to smoothly move the cart between the cargo platform and the cargo receiving platform.

However, it is troublesome to manually pass the road board between the loading platform and the loading platform each time the loading platform lifting device is used, and it also imposes a burden on the operator.

In addition, if the configuration is such that an extended loading platform can be attached to the base of the loading platform as in Patent Document 1, by attaching an extended loading platform of an appropriate length to the base of the loading platform, the distance between the loading platform and the loading platform can be increased. can fill in the gaps. However, even if an extended loading platform is installed, the practical effect is simply expanding the loading platform toward the base and narrowing the preset clearance, which can correct errors in mounting accuracy of the loading platform lifting device, and It is still not enough to narrow the gap caused by draining.

It is an object of the present invention to eliminate the need to manually pass a road board between a loading platform and a loading platform, to enable efficient loading and unloading work using a trolley, and to effectively narrow the gap caused by draining. The purpose of the present invention is to provide a loading platform lifting and lowering device that can be used.

In order to achieve the above object, the present invention provides a loading platform elevating device mounted on a vehicle having a step portion lowered from the floor surface at the end of the floor plate of the loading platform, which can be rotated up and down with respect to the loading platform of the vehicle. a lift arm connected to the tip of the lift arm, and a road board provided at a portion of the cargo board facing the cargo board, the road board being fixed to the back surface of the cargo board. a fixed part that is bent from the fixed part and stands up along an end surface of the load receiving plate opposite to the loading platform; The main part is configured to include a main part located between the cargo platform and the cargo receiving plate, and in a state where the cargo receiving platform is raised to the height of the floor surface of the cargo platform while drawing an arcuate trajectory, the main part: A loading platform elevating device is provided, which is configured to overlap above a stepped portion of the loading platform and to be located between the floor surface of the loading platform and the loading platform. By providing a road plate with a shape suitable for lifting and lowering the loading platform via the lift arm, the structure not only narrows the gap between the loading platform and the loading platform, but also reduces weight by keeping the size to the minimum necessary. ing.

According to the present invention, there is no need to manually pass a road board between the loading platform and the loading platform, cargo handling work using a trolley can be performed efficiently, and gaps caused by draining can also be effectively narrowed. can.

A side view showing the overall structure of a vehicle equipped with a loading platform elevating device according to an embodiment of the present invention A side view of a loading platform elevating device according to an embodiment of the present invention A bottom view of the proximal loading platform of the loading platform lifting device according to an embodiment of the present invention Partial cross-sectional view taken along line IV-IV in Figure 3 Partial cross-sectional view taken along line V-V in Figure 3

Embodiments of the present invention will be described below using the drawings.

- Loading platform lifting device -
FIG. 1 is a side view showing the overall structure of a vehicle equipped with a loading platform elevating device according to an embodiment of the present invention, FIG. 2 is a side view of the loading platform lifting device of FIG. 1, and FIG. 3 is a proximal side loading device described later. It is a bottom view of the stand 21. 4 is a partial sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is a partial sectional view taken along the line V-V in FIG. 3. In the present specification, the left and right sides in FIGS. 1 to 5 are the front and rear of the loading platform lifting device. In this embodiment, a case is illustrated in which the loading platform elevating device is loaded in the rear of the vehicle and the loading platform is pulled out to the rear of the vehicle, and the front-rear direction of the loading platform lifting device coincides with the longitudinal direction of the vehicle. However, there are cases where a loading platform elevating device is loaded on the side of the vehicle so that the loading platform can be pulled out. In that case, the front-rear direction of the loading platform lifting device is orthogonal to the front-rear direction of the vehicle.

The vehicle shown in FIG. 1 includes a vehicle frame (chassis frame) F and a driver's cab C provided in front of the vehicle frame F. A loading platform L is mounted on the upper part of the vehicle frame F. A cargo box is also a type of cargo platform. In this embodiment, a loading platform elevating device 1 is loaded on the rear lower side of the vehicle frame F. For example, when the vehicle is running, the loading platform elevating device 1 folds up the loading platform 20 and draws it into the lower side of the vehicle frame F for storage. On the other hand, during cargo handling work (loading and unloading of cargo to and from the cargo platform), the cargo receiving platform 20 is pulled out to the outside of the vehicle frame F (to the rear in this embodiment), and is raised and lowered between the floor surface height of the cargo platform and the ground contact height. (Figure 1).

As shown in FIG. 2, the loading platform elevating device 1 includes a loading platform 20, a slider unit 30, a lifter unit 40, a power unit (not shown), and a control device (not shown). The slider unit 30 is a unit that includes an actuator that moves the cargo receiving platform 20 and the like in the front-back direction. The lifter unit 40 is a unit that includes an actuator that raises and lowers the loading platform 20. The power unit is a system that drives the slider unit 30 and lifter unit 40. The control device is a device that controls the power unit. The slider unit 30, lifter unit 40, and loading platform 20 will be explained in order.

-Slider unit-
The slider unit 30 includes left and right guide rails 31, a slider 32, and a slide cylinder 33. The left and right guide rails 31 are attached to the rear lower side of the vehicle frame F, and extend parallel to each other back and forth. The slider 32 is slidably attached to the left and right guide rails 31 and is movable back and forth along the guide rails 31. The slide cylinder 33 is a double-acting hydraulic cylinder, and both ends thereof are fixed to the guide rail 31 and the slider 32 via appropriate support members. The slider 32 moves back and forth along the guide rail 31 due to the expansion and contraction of the slide cylinder 33, and the cargo receiving platform 20 supported by the slider 32 via the lifter unit 40 moves back and forth. The slider 32 is provided with a storage support roller 34 for leaning the loading platform 20 during the storage operation of the loading platform 20. The storage support roller 34 is located at the center of the loading platform lifting device 1 in the left-right direction.

-Lifter unit-
The lifter unit 40 includes a tilt arm 41, a lift arm 42, a compression arm (not shown), and a lift cylinder (not shown), one set on each side. The tilt arm 41 has an upper portion connected to the slider 32 via a pin, and a lower portion that rotates back and forth. The lift arm 42 is rotatably connected to the tilt arm 41 at the front end and to the loading platform 20 at the rear end through shafts extending left and right, and is vertically connected to the slider 32 and the loading platform L of the vehicle. Rotate to. The left and right lift arms 42 are connected by a connecting bar extending left and right, thereby increasing the rigidity of the lifter unit 40. The compression arm is rotatably connected to the slider 32 at the front end and to the loading platform 20 at the rear end via a shaft extending left and right. The lift cylinder is a single-acting hydraulic cylinder (double-acting type is also acceptable), and in this embodiment, the front end (rod side) is connected to the lower part of the tilt arm 41, and the rear end (bottom side) is connected to the lift arm 42. Rotatably connected. The lift arm 42 and the compression arm form a parallel link that connects the load receiving platform 20 to the slider 32 so as to be movable up and down. This parallel link rotates up and down as the lift cylinder expands and contracts, so that the loading platform 20 maintains a horizontal position and moves up and down in an arcuate trajectory O (FIG. 2).

-Logging stand-
The loading platform 20 is a platform that lifts and lowers while receiving cargo, etc., and includes a proximal loading platform 21 connected to the tips of the lift arm 42 and the compression arm, and a hinge (not shown) at the rear of the proximal loading platform 21. It is provided with a tip-side load receiving stand 22 rotatably connected via a. The distal side loading platform 22 is rotatable about a hinge, and is reversed (rotated 180 degrees) counterclockwise from the unfolded position (double-dashed line in FIG. 1) when viewed from the left side, and rotates by 180 degrees. 21 and stored below the loading platform L (solid line in FIG. 1). The rear end surface of the cargo receiving platform 20 in the folded state constitutes a bumper of the vehicle. The left and right widths of the loading platform 20 are, for example, approximately the same as the width of the frontage of the loading platform L, and are wider than the outer dimensions of the left and right vehicle frames F. The tip side load receiving platform 22 of this embodiment is of a non-folding type. In other words, the loading platform 20 has a two-piece folded structure including only one loading platform 22 on the front end side.

The proximal loading platform 21 and the leading end loading platform 22 each have a loading receiving plate 23, and the upper surface of these loading receiving plates 23 constitutes a loading surface S1. The cargo receiving surface S1 is an upwardly facing surface that receives cargo and the like, and the cargo receiving surface S1 of the proximal cargo receiving platform 21 always faces upward. The load receiving surface S1 of the front end side load receiving stand 22 faces upward when unfolded, but faces downward when stored. The cargo receiving plate 23 is made of aluminum and is formed hollow by extrusion molding. For example, as shown in FIG. 4, a cavity 23a is provided in the front part (near the front end) of the base end cargo receiving stand 21, extending linearly from side to side and penetrating the receiving plate 23 from side to side. In this embodiment, the cavity 23a opens downward, that is, also to the back surface S2, through a slit 23b. The slit 23b is provided on the back surface S2 along the cavity 23a, and penetrates the cargo receiving plate 23 from side to side.

Further, a pair of left and right stiffeners 24 are provided on the back surface S2 of the cargo receiving plate 23. These stiffeners 24 are provided on the proximal loading platform 21 and the distal loading platform 22, and when the loading platform 20 is expanded, the stiffeners 24 are provided on the proximal loading platform 21 and the distal loading platform 22. When viewed from the left and right, they form a triangular shape that becomes thinner from the base to the tip (rearward).

In addition, in order to prevent the lowered load receiving platform 20 from interfering with the lift arm 42, the front edge of the load receiving plate 23 of the load receiving platform 20 has a pair of left and right notches 25 (FIG. ) is formed. FIG. 3 shows the left half of the proximal loading platform 21, and only the left notch 25 is shown. These notches 25 are each covered with a flap 26. The left and right flaps 26 are formed into a rectangular shape when viewed in the vertical direction according to the shape of the notch 25 (FIG. 3). The rear end of the flap 26 is connected to the load receiving plate 23 of the proximal load receiving platform 21 via a rotation shaft 27 extending left and right, and the front portion rotates up and down to open and close the notch 25. The flap 26 opens upward relative to the load receiving surface S1 of the base end side load receiving stand 21. The lower limit of the rotation range of the flap 26 is the angle at which the load receiving surface S1 of the proximal side load receiving stand 21 and the flap 26 are flush (horizontal if the load receiving surface S1 is horizontal), and beyond this angle, the flap 26 The rotation range of the flap 26 is defined by a stopper so that the flap 26 does not rotate downward.

- Road board -
Here, a stepped portion ST that is one step lower than the floor surface SL (the upper surface of the floor plate FL) is formed at the end portion (in this example, the rear end portion) of the floor plate FL of the loading platform L. This step ST is also called a draining step, and the door DR (FIG. 4) of the cargo platform L in a closed state is located at this step ST.

The loading platform elevating device 1 of this embodiment is equipped with road boards 60 and 70. These road boards 60, 70 are provided at a portion of the loading platform 20 (base end loading platform 21) facing the loading platform L. Here, the portion of the loading platform 20 facing the loading platform L refers to the portion facing the edge of the floor surface SL of the loading platform L when the loading surface S1 of the loading platform 20 is at the height of the floor surface SL of the loading platform L. Specifically, it is the front part of the proximal loading platform 21. The road boards 60 and 70 serve to narrow the gap between the floor surface SL of the cargo platform L and the cargo receiving surface S1 when the cargo platform 20 is located at the height of the floor surface SL of the cargo platform L. The road plates 60 and 70 are made of a material different from that of the cargo receiving plate 23 of the cargo receiving platform 20, and in this embodiment, stainless steel. However, the road boards 60 and 70 can also be made of the same material as the cargo receiving board 23.

As shown in FIG. 4, the road board 60 is formed by bending a plate material that is thinner than the cargo receiving plate 23 of the cargo receiving platform 20 (at least the front end of the cargo receiving plate 23 of the proximal receiving platform 21). , a rising part 62 and a main part 63. In this embodiment, the fixed portion 61, the rising portion 62, and the main portion 63 are formed flat except for bent portions. The road board 60 has a non-movable structure with no movable parts, and is supported in a cantilever manner by the load receiving board 23 with bolts 68 and nuts 69. The board material constituting the road board 60 is thin enough that it will not buckle, taking into consideration the left and right width, front and back length, fulcrum position, etc. of the road board 60, even if the expected maximum load is applied to the road board 60, which has a cantilever support structure. are preferably selected. In this embodiment, the thickness of the plate material constituting the road board 60 is approximately the thickness t of the wall portion surrounding the cavity 23a of the cargo receiving plate 23 (for example, approximately 4.5 mm), and the thickness of the plate material composing the road board 60 is approximately the same as that of the wall portion surrounding the cavity 23a (for example, approximately 4.5 mm). thinner than the thickness of

The fixing portion 61 is a part for fixing the road board 60 to the load receiving platform 20, and is fixed to the back surface S2 of the load receiving plate 23 of the proximal end side receiving platform 21 with bolts 68 and nuts 69. The fixing part 61 extends rearward from the front end of the back surface S2 of the base-side loading platform 21, and has a rear end at a position slightly beyond the slit 23b, and its front-to-back length is slightly longer than the diameter of the head of the bolt 68 and the nut 69. It's about a long time.

The head of the bolt 68 or the nut 69 (in this embodiment, the nut 69) is accommodated in the cavity 23a of the load receiving plate 23, and the shaft (threaded portion, etc.) of the bolt 68 passes through the slit 23b of the load receiving plate 23 and moves up and down. It is extending. The maximum amount of protrusion of the bolt 68 or nut 69 from the back surface S2 of the load receiving plate 23 (the amount of protrusion of the bolt 68 in this embodiment) is smaller than the upper and lower thicknesses of the stiffener 24.

The rising part 62 is a part that connects the fixing part 61 and the main part 63 that are offset vertically, and is bent from the front end of the fixing part 61 and extends along the end surface S3 of the cargo receiving plate 23 facing the loading platform L to adjust the height of the cargo receiving surface S1. Stand up.

The main portion 63 is a portion connected to the load receiving surface S1 of the load receiving plate 23, and is bent from the upper end of the upright portion 62 toward the loading platform L (that is, forward). The main portion 63 of this road board 60 rises together with the loading platform 20 in an arcuate trajectory O as the lift arm 42 rotates, and in the process of reaching the height of the floor surface SL of the loading platform L, the main portion 63 of the loading platform L It approaches the floor surface SL of the loading platform 20 by passing over the end surface (rear end surface) SR. When the loading platform 20 is located at the height of the floor surface SL of the loading platform L, the main portion 63 of the road board 60 overlaps the upper side of the step ST (upward facing surface) of the loading platform L, and is in contact with the floor surface SL of the loading platform L. It is located between the receiving surface S1 of the receiving plate 23 and the receiving surface S1 of the receiving plate 23. When the loading platform 20 is located at the height of the floor surface SL, the upper surface of the main portion 63 of the road board 60, the floor surface SL of the loading platform L, and the loading surface S1 of the loading platform 20 are located at substantially the same height. (errors are allowed), and the gap between the floor surface SL and the cargo receiving surface S1 is narrowed by the main portion 63 of the road board 60. Specifically, the main portion 63 eliminates the gap L2 between the proximal loading platform 21 and the end surface SR of the loading platform L, and narrows the gap L1 caused by the stepped portion ST.

The longitudinal length of the main part 63 is such that the main part 63 does not interfere with the rear end X of the step ST of the cargo platform L (the upper end of the end surface SR of the cargo platform L) when the loading platform 20 moves up and down in an arcuate trajectory O. It is desirable to set it as long as possible within the range. Therefore, the thinner the plate material constituting the road board 60, the longer the longitudinal length of the main portion 63 can be, and the narrower the gap between the floor surface SL and the cargo receiving surface S1.

Further, the road board 60 can be divided into a plurality of locations in the left-right direction as necessary, and configured intermittently, depending on the presence or absence of obstacles that interfere with the lifting and lowering of the loading platform 20. In this embodiment, a configuration in which the road board 60 is divided into five parts in the left-right direction is illustrated in FIG. 3 . For the sake of explanation, here, the outermost road board 60 in the left and right direction is referred to as a road board 60a, the center road board 60 in the left and right direction is referred to as a road board 60b, and the road board 60 between the road boards 60a and 60b is referred to as a road board 60c. do.

The space Z between the road boards 60b and 60c is designed to prevent interference with the lock parts (box metal fittings of the bolt lock) of the rear door of the loading platform L when the loading platform 20 rises to the floor level of the loading platform L. This is a space reserved to avoid this. This space Z can also be replaced by a notch provided at the front edge of the road board 60. In this case, there is no need to divide the road board 60 in order to secure the space Z.

The space between the road boards 60a and 60c is a space for avoiding interference with the lift arm 42 when the loading platform 20 is lowered. The above-mentioned road board 70 is arranged in this space Z, and is blocked by the road board 70 when the loading platform 20 is raised and is at the level of the floor surface of the loading platform L.

The road board 70 is connected to the front part of the flap 26 via a joint plate 71. The road board 70 and the flap 26 are joined together by a joint plate 71 to form an integral plate-like structure, and rotate up and down together around the rotation axis 27. The road board 70 is configured to close (lie horizontally) under its own weight together with the flap 26, and is pushed up by the lift arm 42 and stands up when the load receiving platform 20 is near the ground. At other times (for example, when the load receiving surface S1 is located at the height of the floor surface SL of the loading platform L), the load receiving surface S1 falls horizontally and becomes flush with the road board 60.

-Cargo handling operations-
The cargo handling operation is performed on the condition that the cargo receiving platform 20 is in the unfolded state, specifically, that the rear end sensor (not shown) is on and the gate sensor (not shown) is off. When the operating device (not shown) is operated to raise under this condition, a control signal is output from the control device in response to the raising operation signal, the lift cylinder is extended, and the cargo receiving platform 20 is raised. When a lowering operation is performed using the operating device, a control signal is output from the control device in response to the lowering operation signal, the lift cylinder contracts, and the loading platform 20 is lowered.

Since the loading platform 20 is connected to the lift arm 42, it moves up and down while drawing an arcuate trajectory O centered on the pivot point of the lift arm 42. Since there is a step ST at the rear end of the loading platform L, even if the loading platform 20 rises to the height of the floor surface SL of the loading platform L, there is no space between the loading surface S1 of the loading platform 20 and the floor surface SL of the loading platform L. , a gap is created that is equal to or wider than the length of the stepped portion ST (FIG. 4). However, as mentioned above, the main part 63 of the road board 60 made of a thin plate material passes over the rear end X of the stepped portion ST of the loading platform L and enters the area above the stepped portion ST during the rising process of the loading platform 20. The gap between the floor surface SL of the loading platform L and the loading surface S1 of the loading platform 20 is narrowed (FIG. 4). Of course, even when the loading platform 20 is lowered from the height of the floor surface SL of the loading platform L, the main portion 63 of the road board 60 does not interfere with the structure of the loading platform L.

-effect-
(1) In the present embodiment, the road board 60 attached to the loading platform 20 is bent offset from the back surface S2 of the loading platform 23, and the thin plate-shaped main portion 63 connected to the loading surface S1 is projected forward of the loading platform 20. I'm letting you do it. By manufacturing the road board 60 by bending a thin plate in this way, the inner diameter of the track drawn by the road board 60 is expanded as the loading platform 20 moves up and down, and the main part of the road board 60 is bent to avoid the rear end X of the loading platform L. The portion 63 can be moved into and out of the area above the stepped portion ST.

This allows the main portion 63 of the road board 60 to close most of the gap between the floor surface SL of the loading platform L and the load receiving surface S1 of the loading platform 20 due to the presence of the step ST at the rear end of the loading platform L. I can do it. In this way, the wide gap formed by the step ST in the road board 60 is narrowed, so that cargo handling operations using the trolley can be performed efficiently.

In addition, since the rising portion 62 has a shape that rises up to the height of the load receiving surface S1 along the end surface S3 of the load receiving plate 23 facing the loading platform L, it extends from the height of the fixed portion 61 toward the front side of the vehicle. Compared to the configuration, the main portion 63 can enter the gap L1 while avoiding interference with the end surface SR of the loading platform L due to the vertical movement of the loading platform 20.

In addition, since the road board 60 is a non-movable member attached to the loading platform 20, there is no need to manually open and close it, unlike conventional reversible road boards installed on the loading platform, reducing the burden on the operator. can do. There are no problems caused by forgetting to put the board away after use. Another great advantage is that the road board 60 does not have a complicated movable mechanism, and the road board 60 is easy to manufacture.

Note that the loading platform elevating device 1 may be mounted on a vehicle whose loading platform does not have a stepped portion ST. In this case, the front and back length of the main part 63 of the road board 60 is adjusted as necessary, and the gap between the floor surface SL of the loading platform L and the cargo receiving surface S1 is filled with the main part 63 of the road board 60, so that the cart work etc. can be facilitated.

(2) Since the road board 60 is configured to be fixed to the proximal loading platform 21 with bolts 68 and nuts 69, it is easy to attach and detach. Therefore, for example, when mounting the cargo platform lifting device 1 on a vehicle that has no step at the rear end of the cargo platform and does not require the road plate 60, the road board 60 can be easily removed and the cargo platform lifting device 1 can be mounted on the vehicle. The configuration of the cargo platform lifting device 1 can be flexibly changed depending on the vehicle in which it is installed.

At this time, if the road board 60 is simply bolted to the proximal cargo receiving platform 21, the road board 60 may be configured flat and fastened to the cargo receiving surface S1 with bolts. However, when the road board 60 is fastened to the load receiving surface S1 with bolts, the road board 60 and the heads of the bolts protrude from the load receiving surface S1, creating unnecessary steps. However, in this embodiment, these steps are removed. Occurrence can be prevented.

Further, according to the present embodiment, since the slit 23b through which the bolt 68 is passed is opened downward (vertically downward in this example), rainwater etc. can be efficiently drained from the intervals between the bolts 68 adjacent to each other on the left and right. can. In particular, the loading platform according to this embodiment is preferable not only when used for loading and unloading cargo, but also when stored below the loading platform L, in that the slit 23b is opened vertically downward. In addition, since the cavity 23a and the slit 23b extend linearly and open on the left and right sides of the cargo receiving plate 23, it is easy to insert and remove the head of the bolt 68 or the nut 69 from the narrow cavity 23a. Contributes to facilitating the work of attaching and detaching the 60.

(4) A stiffener 24 is attached to the back surface S2 of the cargo receiving plate 23, and since the cargo receiving board 20 is grounded by the stiffener 24, there is a space between the ground and the cargo receiving plate 23 due to the stiffener 24 when the cargo receiving board 20 is grounded. is ensured.

Therefore, a configuration is adopted in which the road board 60 is bolted to the back surface S2 of the cargo receiving plate 23 of the cargo receiving platform 20. In this case, the bolt 68 or nut 69 protrudes from the back surface S2 of the load receiving plate 23, but even when the load receiving plate 20 is in contact with the ground, the stiffener 24 secures a space between the ground and the load receiving plate 23, so the bolt 68 or the nut 69 protrudes from the back surface S2 of the load receiving plate 23. 69 does not interfere with the ground.

(5) Since the road board 60 can be formed by bending a plate material, the material of the road board 60 is not limited to the material of the cargo receiving platform 20. Furthermore, since the road board 60 is a thin plate and has a small volume, various materials are acceptable in terms of specific gravity. Therefore, the material for the road board 60 can be selected from a wide range of options. In the case of this embodiment, the loading platform 20 is made of aluminum, but stainless steel is selected as the material for the road board 60. Thereby, the road board 60 can be made into a part with high strength and excellent corrosion resistance.

-Modified example-
INDUSTRIAL APPLICATION This invention is applicable to the loading platform lifting device which raises and lowers a loading platform by the rotational movement of an arm, irrespective of the folding structure and storage form of a loading platform. For example, in the above embodiment, the structure in which the tip side loading platform 22 is one piece (loading tray 20 is folded at one point) is illustrated, but the tip side loading tray 22 is configured with a plurality of loading trays in the front and rear, and 20 may be bent at two or more places. The road boards 60 and 70 described above can also be applied to a cargo platform lifting device that employs such a cargo platform. Further, if the loading platform can be stored in the lower part of the vehicle frame F by simply pulling it in with the slide cylinder 33 without folding the loading platform, the folding mechanism of the loading platform 20 itself can be omitted. In addition to the loading platform lifting device that stores the loading platform under the vehicle frame, there are also devices that allow you to select a storage position in which the loading platform is erected along the wall surface (for example, the rear surface) of the loading platform of the vehicle. The present invention is also applicable to a loading platform lifting/lowering device that adopts such two storage postures. Further, the present invention is also applicable to a loading platform elevating device that does not have a mechanism for storing the loading platform under the vehicle frame, but stores the loading platform in an upright manner along the wall surface of the loading platform of the vehicle.

Further, the shape of the road board 60 is not limited to the shape having the raised part 62 between the fixed part 61 and the main part 63 as shown in FIG. It may be fastened with bolts (the upright part 62 also serves as the fixing part 61), that is, it may have an L-shape when viewed from the left and right.

DESCRIPTION OF SYMBOLS 1... Load receiving platform lifting device, 20... Load receiving platform, 23a... Cavity, 23b... Slit, 23... Load receiving plate, 24... Stiffener, 42... Lift arm, 60... Road board, 61... Fixed part, 62... Standing part, 63 ...Main part, 68...Bolt, 69...Nut, FL...Floor plate, L...Cargo platform, O...Circular track, S1...Load receiving surface, S2...Back surface, S3...Opposite end surface, SL...Floor surface, ST...Step part

Claims (6)

In a loading platform lifting device mounted on a vehicle that has a step lower than the floor surface at the end of the loading platform floor plate,
a lift arm that rotates up and down with respect to the loading platform of the vehicle;
a load receiving plate connected to the tip of the lift arm and having a stiffener attached to the back surface of the load receiving plate and grounded;
a road board of a non-movable structure provided at a portion of the loading platform facing the loading platform;
The road board is
a fixing part that is removably fixed to the back surface of the load receiving plate;
an upright portion bent from the fixed portion and rising along an end surface of the load receiving plate facing the loading platform;
The main portion is bent from the raised portion toward the loading platform, and is connected to the loading surface of the loading plate and is located between the loading platform and the loading plate,
In a state in which the loading platform draws an arcuate trajectory and rises to the height of the floor surface of the loading platform, the main portion overlaps the upper side of the stepped portion of the loading platform, and there is a space between the floor surface of the loading platform and the loading platform. It is configured to be located
The road board is configured to rise integrally with the loading platform in an arcuate trajectory as the lift arm rotates, and to approach the floor surface of the loading platform beyond the end surface of the loading platform. A loading platform lifting device featuring: In the loading platform elevating device according to claim 1,
The loading platform elevating and lowering device is characterized in that the rising portion is along the opposing end surface of the loading platform that stands up with an inclination toward the loading platform. The loading platform lifting device according to claim 1 or 2,
The road board is fixed to the loading platform with bolts and nuts,
The load receiving plate includes a cavity extending left and right, and a slit provided on the back surface along the cavity to open the cavity downward;
A loading platform lifting device characterized in that a head or a nut of the bolt is housed in the cavity, and a shaft of the bolt passes through the slit and extends up and down. In the loading platform lifting device according to claim 3,
The load receiving platform elevating device characterized in that the amount of protrusion of the bolt or the nut from the back surface of the load receiving plate is smaller than the upper and lower thicknesses of the stiffener. In the loading platform elevating device according to claim 1,
The load receiving platform elevating device is characterized in that the road board is formed of a material different from that of the load receiving platform. In the cargo platform elevating device according to claim 5,
A loading platform lifting device characterized in that the loading platform is made of aluminum and the road board is made of stainless steel.

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