JP2023102858A - Load-receiving platform lifting device - Google Patents

Abstract

To be unnecessary for delivering a guide plate between a load-carrying platform and a load-receiving platform by manual work, efficiently perform loading/unloading work using a carrier, and effectively narrow a gap by draining.SOLUTION: A load-receiving platform lifting device that is installed on a vehicle having a step part lower than a floor surface on the end of the floor plate of a load-carrying platform includes a lift arm vertically rotated to the load-carrying platform, a load-receiving platform connected to the tip of the lift arm, and a guide plate provided on an opposite part to the load-carrying platform of the load-receiving platform, wherein the guide plate includes a fixed part that is formed of a plate material thinner than a load-receiving plate of the load-receiving platform and is fixed to the rear face of the load-receiving plate, a rising part rising along the opposite end face to the load-carrying platform of the load-receiving plate, and a main part which is connected to the load-receiving surface of the load-receiving plate and is positioned between the load-carrying platform and the load-receiving plate, and the main part is constituted to overlap the upper side of a step part of the cargo-carrying platform, in the state where the load-receiving platform draws a circular track and is lifted up to the height of the floor surface of the load-carrying platform.SELECTED DRAWING: Figure 4

Description

The present invention relates to a load-receiving platform lifting device for supporting cargo handling work on a vehicle loading platform by elevating a loading platform, and preferably to a load-receiving platform lifting device mounted on a vehicle having a step below the floor surface at the rear end of the floor plate of the loading platform and for raising and lowering the load-receiving platform by a rotating arm.

A loading platform elevating device is a device that lifts and lowers a loading platform between the height of the floor surface of the loading platform of a vehicle and the height of the ground surface, thereby assisting loading and unloading of cargo onto and from the loading platform of the vehicle. In this type of load-receiving platform lifting device, it may be necessary to increase the area of the load-receiving platform depending on the load to be placed on the load-receiving platform. As a means for enlarging the area of the load-receiving stand, there is one in which an extended load-receiving stand is attached to the base of the load-receiving stand (Patent Document 1).

Japanese Patent No. 5714309

In the load receiving platform lifting device, a slight clearance is sometimes set in advance in order to prevent the lifting load platform from coming into contact with the loading platform during the lifting and lowering. In addition, a slight gap may occur unexpectedly between the loading platform and the loading platform when it is raised to the floor of the loading platform due to, for example, manufacturing accuracy or mounting accuracy. In some cases, a step called a water drain is provided at the rear end of the floor surface of the cargo bed of the vehicle. Therefore, if there are such gaps and drains, smooth movement of the truck between the loading platform and the receiving platform is hindered.

Therefore, in some cases, a member called a rotating and reversing road board is installed on the loading platform of the vehicle. When the load receiving platform is raised, the road board is manually reversed to protrude from the edge of the loading platform, so that the road board is hung between the loading platform and the loading platform. By providing the road board as necessary, the carriage can be smoothly moved between the loading platform and the 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 imposes a burden on the operator.

In addition, if an extended load receiving platform is attached to the base of the load receiving platform as in Patent Document 1, the gap between the load receiving platform and the loading platform can be filled by attaching an appropriate length of the extended load receiving platform to the base of the load receiving platform. However, even if the extended load-receiving table is installed, the load-receiving table is actually widened to the base side to narrow the preset clearance, but it is still insufficient in terms of correcting errors in mounting accuracy of the load-receiving table lifting device and narrowing the gap due to draining.

An object of the present invention is to provide a load-receiving table elevating device which eliminates the need to manually pass a road board between a load-receiving board and a load-receiving board, enables efficient cargo-handling work using a trolley, and effectively narrows a gap due to draining.

In order to achieve the above object, the present invention provides a load receiving platform lifting device mounted on a vehicle having a stepped portion below the floor surface at the end of the floor plate of the loading platform, comprising: a lift arm that rotates up and down with respect to the loading platform of the vehicle; a load receiving platform connected to the tip of the lift arm; a main portion that bends from the fixed portion and rises along the end face of the load receiving plate facing the load bed; and a main portion that bends from the rising portion toward the load bed, continues to the load receiving surface of the load receiving plate and is positioned between the load bed and the load receiving plate. Provided is a load-receiving platform lifting device configured to be positioned between the floor surface of a platform and the load-receiving platform. By equipping the road plate with a shape suitable for lifting and lowering the load receiving platform via the lift arm, not only does it narrow the gap between it and the loading platform, but it is also designed to be the minimum size necessary to reduce weight.

According to the present invention, there is no need to manually pass a road board between a loading platform and a loading platform, cargo handling work using a truck can be efficiently performed, and a gap due to draining can be effectively narrowed.

1 is a side view showing the overall structure of a vehicle equipped with a load receiving platform lifting device according to an embodiment of the present invention; 1 is a side view of a loading platform lifting device according to one embodiment of the present invention; A bottom view of the base end side load receiving stand of the load receiving stand lifting device according to one embodiment of the present invention. Partial cross-sectional view taken along the IV-IV line in Fig. 3 Partial cross-sectional view taken along line VV in FIG.

Embodiments of the present invention will be described below with reference to the drawings.

－Loading tray lifting device－
1 is a side view showing the overall structure of a vehicle equipped with a load-receiving table lifting device according to an embodiment of the present invention, FIG. 2 is a side view of the load-receiving table lifting device of FIG. 1, and FIG. 4 is a partial sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a partial sectional view taken along line VV in FIG. In the specification of the present application, left and right in FIGS. 1 to 5 are defined as the front and rear of the load receiving tray lifting device. This embodiment exemplifies the case where the load-receiving table lifting device is loaded on the rear part of the vehicle and the load-receiving table lifting device is pulled out to the rear side of the vehicle. However, there are cases in which the load-receiving table lifting device is loaded on the side of the vehicle so that the load-receiving table is pulled out. In that case, the front-rear direction of the load-receiving table lifting device is perpendicular to the front-rear direction of the vehicle.

The vehicle shown in FIG. 1 includes a vehicle frame (chassis frame) F and a cab C provided in front of the vehicle frame F. A loading platform L is mounted on the upper part of the frame F. A cargo box is also a type of carrier. In this embodiment, the loading platform lifting device 1 is mounted on the rear lower side of the vehicle frame F. As shown in FIG. For example, when the vehicle is running, the load receiving platform (platform) 20 of the load receiving platform lifting device 1 is folded and retracted to the lower side of the vehicle frame F for storage. On the other hand, during cargo handling work (loading and unloading work on the cargo bed), the cargo receiving bed 20 is pulled out to the outside of the vehicle frame F (rear in this embodiment) and deployed, and is raised and lowered between the floor surface height of the cargo bed and the ground height (Fig. 1).

As shown in FIG. 2, the load receiving platform lifting device 1 includes a load receiving 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 load receiving table 20 and the like in the front-rear direction. The lifter unit 40 is a unit that includes an actuator that raises and lowers the load receiving table 20 . A power unit is a system that drives the slider unit 30 and the lifter unit 40 . The control device is a device that controls the power unit. The slider unit 30, the lifter unit 40, and the load receiving table 20 will be described 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 forward and backward in parallel with each other. The slider 32 is slidably attached to the left and right guide rails 31 and can move 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 supporting members. The extension and contraction of the slide cylinder 33 causes the slider 32 to move back and forth along the guide rail 31, and the load receiving table 20 supported by the slider 32 via the lifter unit 40 moves back and forth. The slider 32 is provided with storage support rollers 34 for supporting the load receiving table 20 when the load receiving table 20 is retracted. The storage support roller 34 is positioned in the center of the load receiving platform lifting device 1 in the left-right direction.

－Lifter unit－
The lifter unit 40 includes a pair of left and right tilt arms 41, lift arms 42, compression arms (not shown), and lift cylinders (not shown). 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 its front end and to the load receiving platform 20 at its rear end via a laterally extending shaft, and rotates up and down with respect to the slider 32 and the cargo bed L of the vehicle. 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 at its front end to the slider 32 and at its rear end to the load receiving platform 20 via shafts extending laterally. The lift cylinder is a single-acting hydraulic cylinder (or a double-acting type), and in this embodiment, the front end (rod side) is rotatably connected to the lower portion of the tilt arm 41, and the rear end (bottom side) is rotatably connected to the lift arm 42. The lift arm 42 and compression arm form a parallel link that hoistably couples the load cradle 20 to the slider 32 . This parallel link is driven to rotate up and down with the expansion and contraction of the lift cylinder, so that the load receiving table 20 maintains a horizontal posture and moves up and down along an arcuate trajectory O (FIG. 2).

－Receiving table－
The load-receiving table 20 is a table that moves up and down to receive a load or the like, and includes a proximal-side load-receiving table 21 connected to the ends of the lift arm 42 and the compression arm, and a tip-side load-receiving table 22 rotatably connected to the rear portion of the proximal-side load receiving table 21 via a hinge (not shown). The tip-side load receiving platform 22 is rotatable about the hinge, and is reversed counterclockwise (rotated 180 degrees) in a left side view from the unfolded posture (two-dot chain line in FIG. 1), folded over the proximal-side load receiving platform 21, and stored below the loading platform L (solid line in FIG. 1). A rear end face of the load receiving platform 20 in a folded state constitutes a bumper of the vehicle. The left and right widths of the load receiving platform 20 are, for example, about 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 non-foldable. That is, the load receiving tray 20 has a two-fold structure including only one front end side load receiving tray 22 .

The base end side load receiving base 21 and the tip end side load receiving base 22 each have a load receiving plate 23, and the upper surfaces of these load receiving plates 23 constitute the load receiving surface S1. The load-receiving surface S1 is an upward surface for receiving a load or the like, and the load-receiving surface S1 of the base-end-side load-receiving table 21 is always upward. The load-receiving surface S1 of the tip end-side load-receiving table 22 faces upward when deployed, but faces downward when retracted. The load-receiving plate 23 is made of aluminum and formed in the air by extrusion molding. For example, in the front part (near the front end) of the base end load receiving table 21, as shown in FIG. In this embodiment, the cavity 23a is also opened downward, that is, to the rear surface S2 by means of the slit 23b. The slit 23b is provided on the rear surface S2 along the cavity 23a and passes through the load receiving plate 23 in the left and right direction.

A pair of left and right stiffeners 24 are provided on the rear surface S2 of the load receiving plate 23 . These stiffeners 24 are provided on the base end side load receiving base 21 and the tip end side load receiving base 22, and when the load receiving base 20 is unfolded, the stiffeners 24 provided on the base end side load receiving base 21 and the ones provided on the tip end side load receiving base 22 are joined together, forming a triangular shape that becomes thinner from the base end to the tip end (rearward) when viewed from the left and right.

A pair of left and right cutouts 25 (FIG. 3) corresponding to the positions of the left and right lift arms 42 are formed in the front edge of the load receiving plate 23 of the load receiving table 20 so that the lowered load receiving table 20 does not interfere with the lift arms 42. FIG. 3 shows the left half of the base end side load receiving tray 21, showing only the notch 25 on the left side. These notches 25 are covered with flaps 26, respectively. The left and right flaps 26 are formed in 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 base end-side load-receiving table 21 via a laterally extending rotating shaft 27 , and the front part of the flap 26 rotates up and down to open and close the notch 25 . The flap 26 is opened upward with respect to the load receiving surface S1 of the base end side load receiving base 21 . The lower limit of the rotation range of the flap 26 is the angle at which the load receiving surface S1 of the base end load receiving base 21 and the flap 26 are flush with each other (horizontal if the load receiving surface S1 is horizontal), and the rotation range of the flap 26 is defined by a stopper so that the flap 26 does not rotate downward beyond this angle.

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

The loading board lifting device 1 of this embodiment is provided with road boards 60 and 70 . These road boards 60 and 70 are provided at a portion facing the loading platform L of the loading platform 20 (base end loading platform 21). Here, the portion of the load receiving platform 20 facing the loading platform L is a portion facing the edge of the floor surface SL of the loading platform L when the load receiving surface S1 of the loading platform 20 is at the height of the floor SL of the loading platform L, specifically, the front part of the base end side load receiving platform 21. The road boards 60 and 70 play a role of narrowing the gap between the floor surface SL of the loading platform L and the loading surface S1 when the loading platform 20 is positioned at the height of the floor SL of the loading platform L. The road boards 60 and 70 are made of a material different from that of the load receiving board 23 of the load receiving base 20, which is stainless steel in this embodiment. However, the road boards 60 and 70 can also be made of the same material as the load receiving board 23 .

As shown in FIG. 4, the road plate 60 is formed by bending a plate material thinner than the load receiving plate 23 of the load receiving base 20 (at least the front end portion of the load receiving plate 23 of the base end side load receiving base 21), and includes a fixed portion 61, a raised portion 62, and a main portion 63. In this embodiment, the fixing portion 61, the rising portion 62 and the main portion 63 are formed flat except for the bent portions. The road plate 60 has a non-movable structure with no movable parts, and is cantilevered on the load receiving plate 23 by means of bolts 68 and nuts 69 . A board material constituting the road board 60 is preferably selected to be thin in a range that does not buckle even when the road board 60 having a cantilever support structure is subjected to an assumed maximum load, considering the lateral width, the longitudinal length, the fulcrum position, etc. of the road board 60. - 特許庁In this embodiment, the thickness of the plate material forming the road plate 60 is about the thickness t (for example, about 4.5 mm) of the wall portion surrounding the cavity 23a of the load receiving plate 23, and is thinner than the head of the bolt 68 and the nut 69.

The fixing portion 61 is a portion for fixing the road board 60 to the load receiving base 20 , and is fixed to the back surface S<b>2 of the load receiving plate 23 of the base end side load receiving base 21 with bolts 68 and nuts 69 . The fixed part 61 extends rearward from the front end of the back surface S2 of the base end side load receiving table 21 and has a rear end at a position slightly exceeding the slit 23b, and its longitudinal length is slightly longer than the diameter of the head of the bolt 68 and the nut 69.

The head of the bolt 68 or the nut 69 (the nut 69 in this embodiment) is housed in the cavity 23a of the load receiving plate 23, and the shaft (threaded portion, etc.) of the bolt 68 extends vertically through the slit 23b of the load receiving plate 23. The maximum protrusion amount of the bolt 68 or nut 69 (the protrusion amount of the bolt 68 in this embodiment) from the rear surface S2 of the load receiving plate 23 is smaller than the vertical thickness of the stiffener 24 .

The rising portion 62 is a portion that connects the fixed portion 61 and the main portion 63 that are vertically offset, and is bent from the front end of the fixed portion 61 and rises 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.

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 rising portion 62 toward the loading platform L (that is, forward). A main part 63 of the road board 60 rises along an arcuate trajectory O together with the load receiving platform 20 as the lift arm 42 rotates, and approaches the floor surface SL of the loading platform 20 beyond the end surface (rear end surface) SR of the load carrying platform L in the process of reaching the height of the floor surface SL of the loading platform L. When the load receiving platform 20 is positioned at the height of the floor surface SL of the loading platform L, the main part 63 of the road board 60 overlaps the upper side of the stepped part ST (upward surface) of the loading platform L and is positioned between the floor surface SL of the loading platform L and the load receiving surface S1 of the load receiving plate 23. When the load receiving platform 20 is positioned 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 load receiving surface S1 of the load receiving platform 20 are positioned at substantially the same height (errors are allowed), and the gap between the floor surface SL and the load receiving surface S1 is narrowed by the main portion 63 of the road plate 60. Specifically, the main portion 63 eliminates the gap L2 between the base end side load receiving tray 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 portion 63 is desirably set as long as possible within a range in which the main portion 63 does not interfere with the rear end X of the stepped portion ST of the loading platform L (the upper end of the end surface SR of the loading platform L) when the load receiving platform 20 moves up and down along the arc trajectory O. Therefore, the thinner the plate material forming the road board 60, the longer the front-to-rear length of the main portion 63, and the narrower the gap between the floor surface SL and the load receiving surface S1.

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

A space Z between the road boards 60b and 60c is a space secured for avoiding interference with a lock part (box fitting of a bar lock) of the rear door of the loading platform L when the loading platform 20 rises to the height of the floor surface of the loading platform L. This space Z can be replaced by a notch provided in the leading edge of the road plate 60 . In this case, it is not necessary to divide the road board 60 to secure the space Z.

A space between the road plates 60a and 60c is a space for avoiding interference with the lift arm 42 when the load receiving platform 20 is lowered. The road board 70 is arranged in the space Z, and is blocked by the road board 70 when the load receiving platform 20 is raised and is at the height of the floor surface of the loading platform L. - 特許庁

A road plate 70 is connected to the front portion of the flap 26 via a joint plate 71 . The road plate 70 and the flap 26 are jointed by a joint plate 71 to form an integral plate-like structure, which rotates up and down integrally about the rotation shaft 27 . The road board 70 is configured to be closed (set horizontally) integrally with the flap 26 by its own weight. Otherwise (for example, when the load-receiving surface S1 is positioned 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 operation－
The cargo handling operation is performed on the condition that the cargo receiving tray 20 is in the unfolded state, specifically, 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, and the lift cylinder extends to raise the load tray 20 . When a lowering operation is performed by the operating device, a control signal is output from the control device in response to the lowering operation signal, the lift cylinder is contracted, and the load receiving platform 20 is lowered.

Since the load receiving platform 20 is connected to the lift arm 42 , it moves up and down along an arcuate track O centered on the pivot point of the lift arm 42 . Since the rear end of the loading platform L has a stepped part ST, even if the loading platform 20 rises to the height of the floor surface SL of the loading platform L, there is a gap between the load receiving surface S1 of the loading platform 20 and the floor surface SL of the loading platform L, which is the front-rear length of the stepped part ST or wider (FIG. 4). However, the main portion 63 of the road board 60, which is made of a thin plate material as described above, bypasses the rear end X of the stepped portion ST of the loading platform L and enters the area above the stepped portion ST in the process of ascending the loading platform 20, narrowing the gap between the floor surface SL of the loading platform L and the loading surface S1 of the loading platform 20 (FIG. 4). Of course, even when the load receiving platform 20 descends from the height of the floor surface SL of the loading platform L, the main part 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 load receiving board 20 is offset from the back surface S2 of the load receiving board 23 and bent so that the thin plate-like main portion 63 connected to the load receiving surface S1 protrudes forward of the load receiving board 20. By manufacturing the road board 60 by bending the thin plate in this manner, the inner diameter of the track drawn by the road board 60 is enlarged as the load receiving platform 20 is raised and lowered, and the main part 63 of the road board 60 can be moved in and out of the area above the stepped part ST by avoiding the rear end X of the loading platform L.

As a result, 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 stepped part ST at the rear end of the loading platform L can be closed with the main part 63 of the road board 60.例文帳に追加By narrowing the wide gap of the road board 60 by the stepped portion ST in this way, cargo handling work using the trolley can be efficiently performed.

In addition, since the rising portion 62 has a shape that rises 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, the main portion 63 can enter the gap L1 while avoiding interference with the end surface SR of the loading platform L that accompanies the up-and-down movement of the loading platform 20, compared to the structure that extends from the height of the fixed portion 61 toward the front side of the vehicle.

In addition, since the road board 60 is a non-movable member mounted on the load receiving platform 20, it is not necessary to manually open and close the road board unlike the conventional reversible road board provided on the loading platform, and the burden on the operator can be reduced. There is no problem caused by forgetting to put away the board after use. Another great merit is that the road plate 60 does not have a complicated movable mechanism and that the road plate 60 is easy to manufacture.

Note that the loading platform lifting device 1 may be mounted on a vehicle in which the loading platform does not have the step portion ST. In this case, the longitudinal length of the main part 63 of the road board 60 can be adjusted as necessary, and the main part 63 of the road board 60 can be used to fill the gap between the floor surface SL of the loading platform L and the load receiving surface S1 to facilitate carriage work.

(2) Since the road plate 60 is fixed to the base end side load receiving base 21 with bolts 68 and nuts 69, it is easy to attach and detach. Therefore, for example, when the load receiving platform lifting device 1 is mounted on a vehicle that does not require a road plate 60 because there is no step at the rear end of the loading platform, the road plate 60 can be easily removed, and the form of the load receiving platform lifting device 1 can be flexibly changed according to the vehicle on which the load receiving platform lifting device 1 is mounted.

At this time, if the road board 60 is simply bolted to the base end side load receiving base 21, the road board 60 can be formed flat and bolted to the load receiving surface S1. However, when the road board 60 is bolted to the load receiving surface S1, the road board 60 and the head of the bolt protrude from the load receiving surface S1, causing unnecessary steps, but the present embodiment can prevent such steps.

Further, according to this embodiment, since the slit 23b through which the bolt 68 is passed opens downward (vertically downward in this example), rainwater or the like can be efficiently discharged from the space between the bolts 68 adjacent to each other on the left and right. In particular, the loading platform according to the present embodiment is preferable not only when it is used for loading and unloading cargo, but also when it is 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 are opened on the left and right sides of the load receiving plate 23, the head of the bolt 68 or the nut 69 can be easily inserted into and removed from the narrow cavity 23a.

(4) A stiffener 24 is attached to the back surface S2 of the load receiving plate 23, and the load receiving board 20 is grounded by the stiffener 24. Therefore, when the load receiving board 20 is grounded, the stiffener 24 secures a space between the ground and the load receiving board 23.

Therefore, a configuration is employed in which the road plate 60 is bolted to the rear surface S2 of the load receiving plate 23 of the load receiving table 20. As shown in FIG. In this case, the bolt 68 or the nut 69 protrudes from the back surface S2 of the load receiving plate 23, but the stiffener 24 secures a space between the ground and the load receiving plate 23 even when the load receiving base 20 is grounded, so the bolt 68 or the nut 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 load receiving table 20 . In addition, since the road plate 60 is a thin plate and has a small volume, various materials are allowed in terms of specific gravity. Therefore, the material for the road plate 60 can be selected from a wide range of options. In the case of this embodiment, stainless steel is selected as the material of the road plate 60 while the load receiving table 20 is made of aluminum. As a result, the road plate 60 can be a part having high strength and excellent corrosion resistance.

-Modification-
INDUSTRIAL APPLICABILITY The present invention can be applied to a load-receiving stand lifting device that lifts and lowers a load-receiving stand by rotating an arm regardless of the folding structure or storage form of the load-receiving stand. For example, in the above-described embodiment, the tip end side load receiving stand 22 is one (the load receiving stand 20 is broken at one point), but the tip end side load receiving stand 22 may be configured with a plurality of front and rear load receiving stands, and the load receiving stand 20 may be configured to be folded at two or more places. The deck boards 60 and 70 described above can also be applied to a load receiving platform lifting device employing such a load receiving platform. Further, if the load receiving table can be stored in the lower portion of the vehicle frame F simply by pulling it in with the slide cylinder 33 without folding, the folding mechanism itself for the load receiving table 20 can be omitted. In addition to the load receiving platform lifting device that stores the load receiving platform under the vehicle frame, there is also a device that allows the user to select a storage posture in which the loading platform is erected along the wall surface (for example, the rear surface) of the vehicle loading platform. The present invention can also be applied to a loading platform lifting device that employs two types of storage postures. The present invention can also be applied to a load receiving platform lifting device that does not have a mechanism for storing the load receiving platform under the vehicle frame and stores the loading platform in an upright position along the wall surface of the loading platform of the vehicle.

Also, the shape of the road plate 60 is not limited to the shape having the raised portion 62 between the fixed portion 61 and the main portion 63 as shown in FIG.

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

上記目的を達成するために、本発明は、荷台の床板の端に床面より下がった段差部を持つ車両に架装される荷受台昇降装置において、前記車両の荷台に対して上下に回動するリフトアームと、前記リフトアームの先端に連結され、荷受板の裏面に取り付けられて接地するスチフナを有する荷受台と、前記荷受台の前記荷台との対向部に設けられた非可動構造の道板とを備え、前記道板は、前記荷受台の前記荷受板よりも薄い板材で形成され、前記荷受板の裏面に着脱可能に固定される固定部と、前記固定部から折れ曲がり、前記荷受板の前記荷台との対向端面に沿って立ち上がる立上部と、前記立上部から前記荷台に向かって折れ曲がり、前記荷受板の荷受面に連なって前記荷台と前記荷受板との間に位置する主部とを含んで構成されており、前記荷受台が円弧軌道を描いて前記荷台の床面の高さまで上昇した状態で、前記主部が、前記荷台の段差部の上側に重なり、前記荷台の床面と前記荷受台との間に位置するように構成されており、前記道板は、前記リフトアームの回動に伴って前記荷受台と一体に円弧軌道を描いて上昇し、前記荷台の端面を超えて前記荷台の床面に接近するように構成されている荷受台昇降装置を提供する。 By equipping the road plate with a shape suitable for lifting and lowering the load receiving platform via the lift arm, not only does it narrow the gap between it and the loading platform, but it is also designed to be the minimum size necessary to reduce weight.

Claims (6)

In a loading platform lifting device mounted on a vehicle having a stepped portion below the floor at the end of the floor plate of the loading platform,
a lift arm that rotates up and down with respect to the bed of the vehicle;
a loading platform connected to the tip of the lift arm;
A road plate provided at a portion of the load receiving platform facing the loading platform,
The road board is
formed of a plate material thinner than the load-receiving plate of the load-receiving table,
a fixing portion fixed to the back surface of the load receiving plate;
a rising portion that bends from the fixed portion and rises along an end face of the load receiving plate facing the loading platform;
a main portion that bends from the rising portion toward the cargo bed and is continuous with the cargo receiving surface of the cargo receiving plate and positioned between the cargo bed and the cargo receiving plate;
A load receiving platform lifting device, wherein the main part overlaps an upper side of the stepped part of the loading platform and is positioned between the floor of the loading platform and the loading platform in a state in which the loading platform draws an arc and rises to the height of the floor surface of the loading platform. In the loading platform lifting device of claim 1,
The load-receiving platform lifting device is characterized in that the ramp rises integrally with the load-receiving platform along an arcuate trajectory as the lift arm rotates, crosses the end surface of the load-receiving platform, and approaches the floor surface of the load-receiving platform. In the load receiving table lifting device according to claim 1 or 2,
The road board is fixed to the load receiving platform with bolts and nuts,
The load-receiving plate has a cavity extending left and right, and a slit provided on the back surface along the cavity and opening the cavity downward,
A loading platform lifting device, wherein the head or nut of the bolt is accommodated in the cavity, and the shaft of the bolt extends vertically through the slit. In the loading platform lifting device of claim 3,
The load-receiving table has a stiffener attached to the back surface of the load-receiving plate,
A loading platform lifting device, wherein the amount of projection of the bolt or the nut from the rear surface of the loading plate is smaller than the vertical thickness of the stiffener. In the loading platform lifting device according to any one of claims 1-4,
The loading platform lifting device, wherein the road board is formed of a material different from that of the loading platform. In the loading platform lifting device of claim 5,
A loading platform lifting device, wherein the loading platform is made of aluminum, and the road plate is made of stainless steel.

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