JP2002347504A - Cargo lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo lift which is provided with a safety device for softly connecting a cargo mounted on a cargo mounting platform and an opening in a cargo compartment of a cargo carrying vehicle. SOLUTION: Hat-like guide bars 112, which extend in the vertical direction, are disposed at the right side as well as the left side of a frame 111 of an opening which constitutes sidal edges of the opening of a cargo compartment 10 of a cargo carrying vehicle. A safety device 50 comprises a ring-like fastening member 52 disposed at one end of the safety device 50, a hook-like engaging member 53 disposed at other end of the safety device 50 and a flexible string member disposed between and connecting the fastening member 52 and the engaging member 53. The fastening members 52 of the safety device are slidably fastened to the right side and the left side guide bars 112. When a pallet cart 60 containing cargo is mounted on a cargo mounting platform 30 for loading or unloading the cargo to or from the cargo compartment 10, the engaging members 53 of the both side of the safety device 50 are engaged to a cargo member 61 at a point which is higher than the gravity center G of the pallet cart 60 as well as remoter than the opening 11 of the pallet cart 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for loading and unloading cargo from a luggage compartment opening of a load carrying vehicle, between a position near a lower edge of the luggage compartment opening and a position in contact with a road surface. More particularly, the present invention relates to a load lifting device having a safety device for preventing a load from falling and falling on the lifting device.

[0002]

2. Description of the Related Art In order to facilitate loading and unloading of a load onto a load carrying vehicle, an opening and closing device which moves up and down between the same plane as the load floor and the road surface is often provided at the load opening. Then, in order to further facilitate loading and unloading of the load via the lifting device, a load is loaded on the pallet truck using a pallet truck with wheels (casters), and the pallet truck is put on the lifting device together with the pallet truck. By lifting the lifting device and stopping it on the same plane as the floor of the luggage compartment, transferring the pallet truck from the lifting device to the luggage compartment, loading the cargo on the transport vehicle,
Conversely, the pallet truck is transferred from the luggage compartment of the load carrying vehicle to the loading platform of the lifting device stopped on the same plane as the floor of the luggage compartment, and the loading device is lowered by the lifting device to load the cargo. It has been taken down.

[0003] This will be described with reference to an example of a cargo transport vehicle 1 shown in FIG.
The left and right sides of the opening frame 111 that constitutes 1 are formed as columns 21 formed by square pipes, and runners 22 that slide up and down inside the columns 21 by rollers are arranged. The lower ends of the left and right runners 22 are connected by a cross beam 23. The lifting device 20 is configured, and the loading table 30 is pulled out from under the floor of the luggage compartment 10 onto the cross beam 23 of the lifting device 20 to configure the loading lifting device 2.

The power mechanism of the lifting device 20 for raising and lowering the loading table 30 is not shown, but is provided in two rows attached to the tip of a piston rod of a hydraulic cylinder provided at the lower edge of the cargo compartment opening 11. And one row of pulleys provided at the upper end and the lower end of the left and right columns 21, respectively.
Under the floor of the runner, the wire having the other end fixed to the upper end of the runner 22 is routed to the left and right, and the wire is pulled by the extension of the piston rod due to the supply of oil to the hydraulic cylinder.
2, the hydraulic circuit of the cylinder is opened, and the runner 22 is lowered by shortening the hydraulic cylinder by the oil flowing out due to the compression of the piston rod through the wire due to the weight of the load table 30 and the weight of the load. It has become.

On the other hand, as shown in FIG. 8, a cargo portion 61 made of a pipe material is provided above a floor plate 62 in order to facilitate loading and unloading of the load on the load carrying vehicle 1.
In many cases, a load is placed on a pallet truck 60 having wheels 63 with casters attached to the lower surface of the pallet truck, and the pallet truck 60 is placed on the loading platform 30 and raised and lowered by the lifting device 20. However, when the pallet truck 60 is placed on the loading platform 30 and lifted / lowered by the lifting / lowering device 20, the wheels 63 with casters are likely to roll, and there is a risk that the pallet truck 60 falls from the loading platform 30. In order to prevent this drop, a caster stopper 40 is provided over substantially the entire width near the rear end of the loading table 30.

As a specific example of the caster stopper 40, Japanese Patent Laid-Open Publication No. Hei 10-53060 discloses that the caster stopper 40 is supported by a hinge 401 provided on a rear frame 32 of the loading table 30, and is upwardly moved by a coil spring 402, as shown in FIG. The rotatable caster stopper 40 is engaged with the guide pin 41 projecting from the side surface of the caster stopper 40 by a long hole, and one end is provided between the side frame 33 of the loading table 30 and the caster stopper 40. A guide lever 42 supported by a support shaft 44 protruding from the side frame 33 and a rotating shaft 45 protruding from the side frame 33 between the side frame 33 of the loading table 30 and the caster stopper 40 are also provided. A guide pin 41 supported at an intermediate portion and protruding at the upper end from a side surface of the caster stopper 40.
The loading recess 30 is provided at the lower end thereof so as to come into contact with a road surface when the loading table 30 lands.
A lock device 403 composed of a stop lever 43 for disengaging the guide pin 41 projecting from the side surface of the caster stopper 40 from the side of the caster stopper 40 and allowing the caster stopper 40 to fall down allows the loading table 30 to move from the road surface. There is disclosed a caster stopper 40 which is held in a state of protruding from the upper surface of the loading table 30 when it is located above, and which can fall on the same surface as the upper surface of the loading table 30 when the loading table 30 is in a landing state.

Therefore, the pallet truck 60 is moved by the caster stopper 40 while the loading table 30 is in a landing state.
When the loader 30 is put on the loader 30 via a slope plate 34 provided at the rear end of the loader 30 so as to bridge the road surface, the caster stopper 40 is stored in a downright state to allow the pallet truck 60 to pass. When the loading platform 30 is raised, the stop lever 43 engages with the guide pin 41 projecting from the side surface of the caster stopper 40, and the caster stopper 40 is held in a protruding state from the upper surface of the loading platform 30. 60 wheels 63 are caster stoppers 40
To prevent the pallet truck 60 from falling off from the loading table 30.

[0008]

However, the GL shown in FIG.
As shown by the line, when the vehicle is stopped on an inclined road surface such that the opening 11 side of the luggage compartment 10 of the cargo transport vehicle 1 becomes low and the unloading work is performed here, the pallet truck 60 is used.
Simply contacting the wheels 63 of the pallet wheel 60 with the caster stopper 40
Falls and falls off from the loading table 30, or when the double door 12 of the opening 11 is opened with the pallet truck 60 loaded in the luggage compartment 10, the pallet truck 60 in the luggage compartment 10 is not fixed. In this case, the loading table 30
There has been a problem that the pallet truck 60 rolls up and hits the caster stopper 40 vigorously, which may cause the pallet truck 60 to fall over.

For this reason, it is necessary to stop the load transport vehicle 60 by selecting a place where the road surface inclination is small, and to suppress the ascending and descending speed of the loading table 30 for unloading work as much as possible. However, if the stop position is selected or the lifting / lowering speed of the loading table is suppressed as described above, it takes a long time for the loading operation, and the delivery efficiency and the operating rate of the load transport vehicle are likely to be reduced.

[0010] Further, even if the loading / unloading vehicle 1 is stopped on a flat ground, the axis of the wheel 63 of the pallet truck 60 is positioned with respect to the front edge of the caster stopper 40 as shown in FIG. In the case where the caster stopper 40 abuts at an angle α in plan view, the angle θ2 of the caster stopper 40 becomes smaller as the apparent angle θ4 as shown in FIG. That is, the angle θ1 connecting the axis of the wheel 63 and the contact point between the wheel 63 and the caster stopper 40 is determined by the wheel 63
The angle of the caster stopper 40 becomes small even if the axis of the caster stopper 40 is not substantially changed like the angle θ3 when the axis is inclined at the angle α in a plan view. There is also a problem that the possibility of riding on the stopper 40 increases.

In view of the above, an object of the present invention is to provide a cargo lifting / lowering device provided with a safety device capable of preventing a load placed on a loading table from falling and falling off.

[0012]

SUMMARY OF THE INVENTION According to the present invention, there is provided a load elevating apparatus, comprising: a load table on which a load can be placed; and a load table mounted at a position close to a lower edge of an opening of a load room and a road surface. A lifting / lowering device capable of lifting / lowering between the contacting position and an engagement portion having one end connected to a side edge of the opening of the cargo room and the other end capable of engaging with the cargo on the cargo mounting table; And a safety device for preventing the cargo from falling and falling on the side opposite to and side from the opening while allowing the cargo to rise and fall.

[0013] Accordingly, by engaging the engaging portion of the safety device with the load, the load can be prevented from falling and falling at any position of the load-carrying table, whether it is raised or lowered.

The load elevating device according to the present invention is provided on the load table so as to be able to protrude and retract, and in the protruding state, the load is moved to a side opposite to the opening by contacting the load. A stopper for restricting the pressure is provided. Therefore, by installing the safety device in combination with the stopper provided on the loading table, it is possible to more securely prevent the load from falling and falling off, and thus to speed up the unloading of the load and the lifting operation of the loading table. As a result, the speed of unloading and loading operations can be increased safely.

Further, in the cargo lifting device according to the present invention, the safety device may include a pair of flexible cord-like portions each having one end connected to left and right side edges of the opening so as to be vertically movable; An engagement portion provided at the other end of the shape portion and capable of engaging with a load. Therefore, even if the position of the load with respect to the load mounting table is slightly shifted, the engagement portion can be engaged with the load flexibly corresponding to the position by the flexible cord-like portion. In addition, the cargo can be transferred from the loading table to the cargo room while the safety device is engaged with the cargo.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of a cargo lifting device according to the present invention will be described below with reference to the drawings. The cargo lifting device according to the present embodiment is provided at the rear of a dry-type cargo transport vehicle. Here, FIG. 1 is a side view of a load carrier equipped with the load lifting device according to the present invention, and FIG. 2 is a plan view of the load lift device of the load carrier. FIG. 3 is a perspective view of an example of a safety device provided in the load lifting device.

(Configuration) The configuration of the load lifting device according to the present invention will be described. However, the same components as those in the related art are denoted by the same reference numerals, and the description will be simplified. As shown in FIG. 1, the cargo lifting / lowering device 2 includes, as shown in FIG. 1, left and right sides of an opening frame 111 constituting a rear opening 11 of the cargo transporting vehicle 1 as columns 21 each formed of a square pipe. Runner 22 sliding up and down in this column 21
And a lifting device 20 in which the lower ends of the left and right runners 22 are connected by a cross beam 23, and a loading table 30 that is pulled out from under the floor of the luggage compartment 10 of the load transport vehicle 1 onto the cross beam 23. I have.

In order to facilitate loading and unloading of the load on the load transport vehicle 1, a load is loaded on the pallet truck 60, and the state in which the load is loaded on the pallet truck 60 is transported as a load. Also in the present embodiment, a state in which a load is loaded on the pallet truck 60 is defined as a load. As shown in FIGS. 1 and 2, the pallet truck 60 has vertical frames 611 of required heights erected at four corners of the floorboard 62, and adjacent vertical frames of the four vertical frames 611. 611 are connected by horizontal rails 612 arranged at required intervals in the vertical direction, and wheels 63 with casters are attached to the four corners of the lower surface of the floor plate 62.

Further, a caster stopper 40 which can be freely laid down is provided in the rear of the loading table 30 as in the prior art. The most significant feature of the load lifting device 2 is that one end is connected to the side edge of the opening 11 of the load room 10 and the other end is a pallet truck 60 (load on the pallet truck 60) as a load placed on the load table 30. Safety device which has an engaging portion engageable with the load and prevents the load from falling and dropping on the opposite side and side of the opening 11 while allowing the load to move up and down. 50 has been added. Hereinafter, the safety device 50 will be described in detail.

As shown in FIG. 3, the safety device 50 has a ring-shaped connecting portion 52 at one end and an engaging portion 53 at the other end, and connects the connecting portion 52 and the engaging portion 53 to each other. They are connected by a flexible string-like portion 51 of a required length. That is, the ring-shaped connecting portion 52 may be a string-shaped portion formed by rolling a steel round bar into a ring shape or a steel plate having a predetermined width rounded into a cylindrical shape as shown in FIG. A joint portion 521 connected to 51 is formed. Then, a guide rod 112, which will be described later, attached to the opening 11 of the luggage compartment 10 is inserted into the center of the ring-shaped or cylindrical coupling portion 52, and moves up and down the luggage compartment 10 along the guide rod 112. Attach so that you can. The guide bar 112 and the safety device 50 are provided as a pair on the left and right side edges of the opening 11 of the luggage compartment 10.

The engaging portion 53 is formed by two steel rods, each of which has a hook-like tip bent like a question mark, and is spaced apart from each other at predetermined intervals vertically with the hook shape as a plane. 531 and 532 integrally joined
The other end of the string portion 51 is connected to the root portion 533, and a leaf spring 534 for closing the root portion 533 and the tip of the hook 531 is attached to one hook 531.

As shown in FIG. 5 (A), a flexible string-like portion 51 for connecting the connecting portion 52 and the engaging portion 53 can be used as a webbing 511 used for an automobile seat belt or as shown in FIG. 5 (B). Fine braided steel wire or piano wire and cord 512
Or a chain 513 such as a tire chain
Such as those covered with a soft resin cover or canvas on the outside of
It is desirable to be made of a material that is lightweight and has sufficient strength.

The ring-shaped connecting portion 52 of the safety device 50
As shown in FIG. 3, the guide rod 112 for attaching the pallet to the luggage room 10 is formed by bending a steel pipe or a round bar into a hat shape, and is vertically attached to the indoor side of the opening frame 111 of the luggage room 10 with the mounting holes at both ends. Can be Further, as shown in FIG. 4, the vertical height of the guide rod 112 is equal to the vertical stroke H of the loading table 30 in the straight portion at the bottom of the hat.
That is, it is desirable that the height is set to about の of the ground height of the floor of the luggage compartment 10 of the load transport vehicle 1. The vertical mounting position of the luggage compartment 10 on the opening frame 111 is determined by the guide rod 112.
It is desirable that the center of the straight portion of the bottom of the hat shape is attached to the stroke H from the floor of the luggage compartment 10.

(Operation) Next, the operation of the load lifting device provided with the safety device configured as described above will be described.
First, as shown in FIG. 1 and FIG. 2, the engaging portion 53 of one safety device 50 is placed above the center of gravity G of the pallet truck 60 placed on the loading platform 30 of the Room 1
0 vertical frame 6 located far from opening 11
One of the hooks 531 is engaged with the vertical frame 611 above the horizontal rail 612 at a portion where the horizontal rail 11 and the horizontal rail 612 intersect,
The other hooks 532 are engaged with the vertical frame 611 below the horizontal rail 612, and are connected to the pallet truck 60 so that the hooks 531 and 532 do not slip down. The hook 531 of the other safety device 50 is also provided at a position where the left vertical frame 611 and the horizontal rail 612 located far from the opening 11 of the luggage compartment 10 of the pallet truck 60 intersect, at a vertical frame above the horizontal rail 612. One hook 531 is engaged with the vertical frame 611, and the other hook 532 is engaged with the vertical frame 611 below the horizontal rail 612.
1, 532 are connected to the pallet truck 60 so that the hooks 531 and 532 of the left and right safety devices 50 and 50 face each other.

At this time, as shown in the plan view of FIG. 2, the length of the string portion 51 of the safety device 50 is such that the pallet truck 60 is placed on the loading table 30 and its wheels 63 are loaded. The guide rod 112 and the pallet truck 6 are contacted by the safety device 50 in a state where the caster stopper 40 is provided on the table 30.
It is desirable that the setting is made so that when the vertical frame 611 is connected to the vertical frame 611 at a position distant from the opening 11, the line becomes substantially straight.

When the load carrying vehicle 1 is stopped on a flat road surface, loading of the pallet truck 60 into the luggage compartment 10 is as follows.
With the lifting device 20 lowered and the loading platform 30 in contact with the road surface, the pallet truck 60 is pushed and rides on the loading platform 30 over the slope plate 34 from the road surface, and the hooks 531 and 532 of the safety device 50 are moved. The vertical frame 611 and the horizontal bar 612 that are located above the center of gravity of the pallet truck 60 and far from the opening 11 of the luggage compartment 10 engage with each other. The upper surface is stopped so as to be flush with the floor surface of the luggage compartment 10. Thereafter, the hooks 531 and 532 of the safety device 50 are removed from the pallet truck 60, and the pallet truck 60 is pushed and transported into the luggage compartment 10. Then, the lifting device 20 is lowered to bring the loading table 30 into contact with the road surface, the next pallet truck 60 is mounted, and the above operation is repeated.

Then, the last pallet truck 60 is moved to the luggage room 10.
To the safety device 50, the hooks 531 and 53
2 is connected as it is without removing it from the pallet truck 60. However, in this state, the string portion 51 of the safety device 50 is connected in a loosened state.

Next, when unloading the pallet truck 60 from the cargo transport vehicle 1 which has loaded and transported the pallet truck 60 as described above, the cargo transport vehicle 1 is stopped on an inclined surface as shown in FIG. Therefore, when lowering the pallet truck 60, the loading platform 30 is pulled out from under the floor of the luggage compartment 10 and slightly raised, and the upper surface of the loading platform 30 is placed on the same plane as the floor surface of the luggage compartment 10. Open the door 12. Kannon door 1
2 open the luggage compartment 10 because the luggage compartment is inclined rearward.
The pallet truck 60 placed at the rear end of the pallet truck rolls out onto the loading platform 30 while abutting on the double doors 12, and the upper part of the pallet truck 60 is positioned above the safety device 5 where it rolls forward.
0 and the wheels 63 are caster stoppers 40 below.
, The pallet truck 60 is placed on the loading platform 30 without falling and falling, and the lifting device 20 can be safely lowered.

When the lowering operation of the lifting / lowering device 20 is completed and the loading platform 30 comes into contact with the road surface, the hooks 531 and 532 of the safety device 50 are removed from the pallet truck 60, and the caster stopper 40 is turned down to the loading platform 30. The pallet truck 60 is lowered. Then, the loading table 30 is lifted so that the upper surface thereof is positioned at the same height as the floor of the luggage compartment 10, and the safety device 50 is connected to the next pallet truck 60 in the same manner as described above, and the pallet truck 60 is loaded. It is mounted on the mounting table 30. However, the pallet truck 60 next to the last pallet truck 60
The luggage compartment 10 is also inclined, so that the luggage compartment 10 tries to exit from the luggage compartment 10, but before the opening 11 of the luggage compartment 10 by another means,
Since the safety device 50 is fixed in the luggage compartment 10, the safety device 50 is connected to the pallet truck 60 in a slack state. Then, the other fixing means is released and the pallet truck 60 is placed on the loading table 30.

As described above, a vertically long hat-shaped guide rod 112 is attached to the left and right sides of the opening frame 111 constituting the left and right side edges of the opening 11 of the luggage compartment 10 of the cargo transporting vehicle 1. The connecting device 52 of the safety device 50 in which a ring-shaped connecting portion 52 provided on one end and a hook-shaped engaging portion 53 provided on the other end are connected by a flexible cord portion 51 to the connecting device 112. When the pallet truck 60 is placed on the loading platform 30 and unloaded into the cargo room 10,
By engaging the engaging portions 53 of the left and right safety devices 50 with a cargo portion 61 located farther from the opening 11 of the pallet truck 60 and above the center of gravity G of the pallet truck 60, Since the safety device 50 is tensed and supports the pallet truck 60 when trying to fall or fall, it is possible to safely and quickly load and unload the cargo into the luggage compartment.

Note that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. As shown in FIG. 6, in addition to the various configurations and materials of the safety device 50 as shown in FIG. 5, the safety device 50 to be engaged with the guide rod 112 attached to the opening frame 111 of the luggage compartment 10 as shown in FIG. Connecting part 52,
Roller 5 having a concave circular surface between two triangular plates
26 are vertically supported in two rows on one side by a support shaft 527, the outer diameter of the guide rod 112 is separated, and the support shaft 528 is separated on the other side.
Bracket 525 supporting one roller 526 by
Of the string-shaped portion 5 on the support shaft 528 on the one roller 526 side.
The webbing 511 of No. 1 may be attached by branching into a Y-shape.

[0032]

According to the present invention, a loading table on which a load can be loaded, and the loading table can be moved up and down between a position close to the lower edge of the opening of the luggage compartment and a position in contact with the road surface. A loading device having one end connected to the side edge of the opening of the cargo compartment and the other end having an engaging portion capable of engaging with the load on the loading table, allowing the load to be raised and lowered. And a safety device for preventing the device from falling and dropping on the opposite side and side of the opening, so that the load is overturned and dropped by engaging the engagement portion of the safety device with the load. And safe and quick transportation and unloading of the cargo became possible.

[Brief description of the drawings]

FIG. 1 is a side view of a load carrying vehicle equipped with a load lifting device according to one embodiment of the present invention.

FIG. 2 is a plan view of the cargo lifting device according to one embodiment of the present invention.

FIG. 3 is a perspective view of an example of a safety device provided in the load lifting device according to one embodiment of the present invention.

FIG. 4 is a side view of a load lifting device according to an embodiment of the present invention on an inclined road surface.

FIG. 5 is a perspective view showing another embodiment of the safety device provided in the load lifting device according to one embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment showing a connecting portion of the safety device provided in the load lifting device according to one embodiment of the present invention.

FIG. 7 is a perspective view showing a conventional cargo carrying vehicle.

FIG. 8 is a side view showing a conventional cargo lifting device.

FIG. 9 is a partially cutaway side view showing an example of a conventional caster stopper.

FIG. 10 is a plan view showing a state where wheels of a pallet truck abut a caster stopper obliquely.

FIG. 11 is a schematic diagram showing a state of the wheels and the caster stopper in a state where the wheels of the pallet vehicle abut the caster stopper obliquely.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cargo transport vehicle 10 Load room 112 Guide rod 2 Loading elevating device 20 Elevating device 30 Loading stage 40 Caster stopper 50 Safety device 51 String part 52 Connecting part 53 Engaging part 60 Pallet truck (load)

Claims (3)

[Claims] 1. A loading table on which a load can be placed, and an elevating device which enables the loading table to be moved up and down between a position close to a lower edge of an opening of a luggage compartment and a position in contact with a road surface. One end is connected to the side edge of the opening of the cargo compartment, and the other end has an engaging portion capable of engaging with the load on the loading table, allowing the load to move up and down while opening the load. And a safety device for preventing the device from falling and falling on the opposite side and side. And a stopper that is provided on the loading table so as to be able to protrude and retract, and that in the protruding state, restricts the load from moving to the side opposite to the opening by contacting the load. The load lifting device according to claim 1, wherein: 3. The safety device includes a pair of flexible cords having one ends connected to left and right side edges of the opening movably, and a load provided at the other end of each cord. 3. An engaging portion which can be engaged with the vehicle.
The load lifting device according to item 1.