JPH0712170Y2 - Loom floor lifting device for lorries - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bed floor lifting device for a freight vehicle that lifts and lowers a lift floor to load and unload cargo. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo floor raising / lowering device for a freight vehicle that can be used as a part of a lift floor or a road plate or a shock absorbing plate by providing an extension plate and fixing the extension plate horizontally and vertically.

[Conventional technology]

Various types have been proposed for the bed floor lifting device of a lorry.

BACKGROUND ART Conventionally, a cargo floor lifting device for a lorry has been provided at the rear of the cargo bed. The lower chassis frame at the rear of the platform has been removed and an opening is provided in the floor.
A lift floor is provided so as to block this opening. The lift floor was lifted and lowered by a lifting mechanism composed of cylinders, chains, pulleys and the like.

[Problems to be solved by the device]

However, since the conventional lift bed lifting device has a limited lift floor area, many loads cannot be loaded and unloaded at one time. At the descending end of the lift floor, there will be a step between the lift floor and the road surface.Therefore, it is necessary to prepare a separate road board so that the heights of the lift floor and the road surface are the same so that luggage can be loaded and unloaded smoothly. It was Therefore, there is a problem that the unloading work requires a lot of time and labor.

Also, since the rear chassis frame was removed so that the lift floor could be raised and lowered, it was not possible to provide a rear impact absorbing plate (rear bumper) for a freight vehicle. Therefore, when another vehicle collides with the rear part of the lorry or comes into contact with a building or the like, the impact cannot be absorbed, which is very dangerous.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide a cargo floor raising / lowering device for a freight vehicle, which can reduce working time and labor and can improve the safety of the freight vehicle.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a cargo bed floor lifting device according to the present invention is a cargo bed floor lifting device for lifting and lowering a lift floor provided on a part of a cargo bed, wherein An extension plate rotatably attached to one side of the rear end of the floor, a horizontal fixing mechanism for fixing the extension plate at a substantially horizontal position, and a vertical fixing mechanism for fixing the extension plate at a substantially vertical downward position. When the lift floor is raised or lowered, the extension plate extends rearward horizontally by the horizontal fixing mechanism to become a part of the lift floor, becomes a road plate between the lift floor and the road surface at the descending end, and becomes the above at the rising end. It is configured to serve as a shock absorbing plate by being fixed substantially vertically downward by a vertical fixing mechanism.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

1 to 4 are views showing an embodiment of a bed floor lifting device for a freight vehicle according to the present invention. FIG. 1 is a perspective view of the whole, and FIG. 2 is a view of the device of the same embodiment. Sectional views, FIGS. 3 and 4 are views for explaining the extension plate, the horizontal fixing mechanism, and the vertical fixing mechanism used in the apparatus of the embodiment.

In each figure, 1 is a packing box, 2 is a lift floor, 3 is an extension plate,
4 is a horizontal fixing mechanism, 5 is a vertical fixing mechanism, and 6 is a lifting mechanism.

The lift bed lifting device for a freight vehicle according to the present invention is provided with a lift floor 2 on the bottom surface at the rear side of the cargo box 1, an extension plate 3 is rotatably attached to the lift floor 2, and a lift floor 2 is lifted by a lifting mechanism 6.
Is going up and down.

The luggage box 1 has an opening / closing door 11 attached to the rear surface thereof and is supported by a chassis frame 13. A chassis frame 14 is provided on the rear side of the chassis frame 13 and below the side surface of the packing box 1.

A support frame 15 is attached to the upper side of the chassis frame 14. Guide grooves 14a and 15a are formed inside the chassis frame 14 and the support frame 15, respectively. The guide grooves 14a and 15a serve as guides for vertically moving a post 21 described later. The support frame 15 further contains a sliding frame 16.

The sliding frame 16 slides in the support frame 15 by expansion and contraction of a cylinder 17 provided in the chassis frame 14. A protrusion 16a is formed on the sliding frame 16, and the protrusion 16a supports the lift floor 2 when positioned below the lift floor 2. Reference numeral 18 is a cover for covering the chassis frame 14, the support frame 15, and the like.

The lift floor 2 is provided so as to be able to close the opening 1a of the floor surface 12 of the luggage box 1. Two columns 21 are attached to each of the left and right ends of the lift floor 2.
The lower side of 21 has a tapered surface corresponding to the above-mentioned protrusion 16a. The lift floor 2 is moved up and down by an elevating mechanism 6 described later to load and unload cargo.

As shown in FIG. 3, the extension plate 3 is rotatably attached to the rear end of the lift floor 2 via a two-stage hinge 22. The extension plate 3 is rotated by the two-stage hinge 22 in a range from a substantially horizontal position to a substantially vertical position. An inclined surface 3a is formed at the tip of the extension plate 3.

The horizontal fixing mechanism 4 horizontally fixes the extension plate 3 to the lift floor 2, and a fixing hook provided on the lift floor 2.
41 and a fixing bar 42 provided in the recess of the extension plate 3. When horizontally fixing the extension plate 3 to the lift floor 2, as shown in FIG. 3 (b), first, the extension plate 3 is rotated slightly above the horizontal with respect to the lift floor 2 for fixing. The hook 41 is hooked on the fixing bar 42. After that, when the extension plate 3 is returned to the horizontal position, the arm portion 41a of the fixing hook 41 hits the lift floor 2 and is fixed at this position.

The vertical fixing mechanism 5 uses the extension plate 3 for the chassis frame described above.
It is fixed at 14. In this example, the first mechanism 51
And a second mechanism 52 is additionally provided (see FIGS. 3 and 4).
Figure).

The first mechanism 51 includes a claw portion 51a provided in a concave portion of the extension plate 3.
And two connecting rods 51 urged toward the chassis frame 14
b and the connecting rod receiver 51c provided on the chassis frame 14
It consists of When removing the extension plate 3 from the chassis frame 14, first, the claw portion 51a is raised. The rotational movement of the claw portion 51a is converted into a parallel movement of the connecting rod 51b by a conversion mechanism (not shown), so that the tip of the connecting rod 51b is received by the receiving member 5.
It is pulled out from the 1c hole. When the extension plate 3 is fixed to the chassis frame 14, the extension plate 3 is rotated with respect to the lift floor 2 until the angle is slightly acute. A guide surface is formed at the tip of the connecting rod 51b, and the connecting rod 51b is pulled back inward against the urging force in the direction of the chassis frame 14 by riding over the projection of the receiving member 51c. Be done. After that, when the tip of the connecting rod 51b is aligned with the hole of the receiving member 51c,
The connecting rod 51b is inserted into the receiving member 51c by the urging force. In this way, the extension plate 3 is fixed to the chassis frame 14.

The second mechanism 52 includes a fixing rod 52a provided on the chassis frame 14 and a fixing hole 52b provided on the extension plate 3. When the extension plate 3 is fixed, as shown in FIG. 3 (c), the extension plate 3 is rotated slightly inward from the rear end of the chassis frame 14, and then the fixing rod 52a is fixed to the fixing hole 52b.
To insert.

The first mechanism 51 allows the extension plate 3 to be easily fixed to or removed from the chassis frame 14. Further, since the second mechanism 52 is locked, it can be securely fixed.

As shown in FIG. 1, the lifting mechanism 6 includes a cylinder 61, a chain 62, a pulley (not shown), and the like. The chain 62 has one end connected to a piston rod (not shown) of the cylinder 61, and the other end connected to a column 21 provided on the lift floor 2 via a pulley or the like in the middle.

Next, the operation of the embodiment of the bed floor lifting device for a freight vehicle according to the present invention will be described with reference to FIG.

When raising and lowering the lift floor 2 to load and unload cargo, as shown in FIG.
And the extension plate 3 is fixed to the lift floor 2 by the horizontal fixing mechanism 4 at a substantially horizontal position. After that, by extending the sliding cylinder 17, the sliding frame 16 moves forward, and the protrusion 16a is disengaged from the lower side of the column 21. For this reason, the column 21
Can be moved up and down by using the guide grooves 14a and 15a as guides. After that, the lift floor 2 and extension plate 3 are extended via the chain 62 by expanding and contracting the lifting cylinder 61.
Moves up and down (Fig. 5 (b)).

Therefore, since the extension plate 3 can be used as part of the lift floor 2 during lifting and lowering, a large amount of luggage can be loaded and unloaded at one time, and the working time can be shortened. A person can ride on the extension plate 3 to work. Further, since the extension plate 3 can be used as a road plate at the descending end, it is not necessary to separately prepare a road plate, and the work load can be reduced by loading and unloading using a trolley or the like.

On the other hand, when not loading and unloading luggage, the lifting mechanism 6
Thus, the lift floor 2 is raised to the floor surface 12. Next,
The cylinder 17 is contracted to slide the sliding frame 16 to the lower side of the lift floor 2, and the projection 16a supports the lift floor 2. For this reason, the lift floor 2 slides on the sliding frame 16,
It is supported by the chassis frame 14 via the support frame 15. After this, the vertical fixing mechanism 5
The extension plate 3 is fixed to 14 (Figs. 1 and 3). As a result, the extension plate 3 serves as a shock absorbing plate at the rear of the freight vehicle, so that the shock caused by an accident can be absorbed and the safety can be enhanced.

FIG. 6 is a view showing another embodiment of the horizontal fixing mechanism and the vertical fixing mechanism which constitute the loading platform raising / lowering device of the lorry of the present invention.

The horizontal fixing mechanism 7 of this example includes a fixing protrusion 71 provided on the lift floor 2 and a fixing notch 72 provided on the extension plate 3.
And a fixing pin 73 having one end bent into a crank shape and the other end bent into a substantially U-shape. When fixing the extension plate 3 to the lift floor 2, the extension plate 3 is rotated with respect to the lift floor 2 until the extension plate 3 becomes substantially horizontal, and the hole 72a is aligned with the hole 71a. By inserting the fixing pin 73 into the holes 71a and 72a in this state, the extension plate 3 is fixed horizontally (FIG. 6 (b)). Since the horizontal fixing mechanism 7 only needs to move the fixing pin 73 left and right, it becomes easy to fix the extension plate 3 to the lift floor 2.

The vertical fixing mechanism 6 includes a fixing rod 61 provided on the chassis frame 14 and a fixing hole 62 provided on the extension plate 3. The vertical fixing mechanism 6 can fix the extension plate 3 to the chassis frame 14 by substantially the same operation as the vertical fixing mechanism 5 described above.

FIG. 7 is a view showing still another embodiment of the horizontal fixing mechanism which constitutes the bed floor lifting device of the freight vehicle of the present invention.

The horizontal fixing mechanism of this example includes the horizontal fixing mechanism 4 described above,
It is a combination with the horizontal fixing mechanism 7. In this case, first, the extension plate 3 is rotated to a position slightly higher than horizontal, and then fixed by the horizontal fixing mechanism 4. At this time, since the fixing holes 71a and 72a of the horizontal fixing mechanism 7 are aligned with each other, the fixing pin 73 can be easily inserted into the fixing holes 71a and 72a. In this example, since the horizontal fixing mechanisms 4 and 7 are used for fixing, the strength is increased and it is suitable for lifting heavy loads.

Various modifications can be made without being restricted to the embodiments described in detail above.

Although a chain or a cylinder is used for the lifting mechanism for lifting the lift floor, other devices such as a belt or a winding mechanism may be used.

The position where the lift floor is provided is not limited to the rear part of the luggage box, but may be a side surface of the luggage box or the like depending on the form of the lorry and the convenience of loading and unloading the luggage.

Although an example of forming an inclined surface at the tip of the extension plate has been described,
If the extension plate is fixed slightly below the horizontal with respect to the lift floor, the inclined surface becomes unnecessary.

[Effect of device]

As described in detail above, the cargo floor lifting device according to the present invention can be provided with an extension plate on the lift floor, and the extension plate can be fixed horizontally or vertically as required.

By horizontally fixing the extension plate to the lift floor and raising and lowering it as a part of the lift floor, it is possible to load and unload a lot of luggage at a time. At the descending end, the extension plate serves as a road plate between the lift floor and the road surface, so that it is not necessary to separately prepare a road plate as in the conventional case. Therefore, the working time and labor can be reduced.

Further, by fixing the extension plate vertically, it becomes a shock absorbing plate at the rear part while the freight vehicle is running, so the safety is improved.

[Brief description of drawings]

1 to 4 are views showing an embodiment of a bed floor lifting device for a freight vehicle according to the present invention. FIG. 1 is a perspective view of the whole, and FIG. 2 is a view of the device of the same embodiment. Sectional views, FIGS. 3 and 4 are views for explaining the extension plate, the horizontal fixing mechanism, and the vertical fixing mechanism used in the apparatus of the embodiment. FIG. 5 is a view for explaining the operation of the embodiment of the bed floor lifting device for a lorry according to the present invention. FIG. 6 is a view showing another embodiment of the horizontal fixing mechanism and the vertical fixing mechanism which constitute the loading platform raising / lowering device of the lorry of the present invention. FIG. 7 is a view showing still another embodiment of the horizontal fixing mechanism which constitutes the bed floor lifting device of the freight vehicle of the present invention. 1 …… Package box 2 …… Lift floor 3 …… Extending plate 4 …… Horizontal fixing mechanism 5 …… Vertical fixing mechanism 6 …… Lifting mechanism

Claims (1)

[Scope of utility model registration request] 1. A cargo bed floor lifting device for a freight vehicle, which lifts and lowers a lift floor provided on a part of a cargo bed, and is rotatably attached to one side of a rear end of the lift floor. An extension plate, a horizontal fixing mechanism that fixes the extension plate at a substantially horizontal position, and a vertical fixing mechanism that fixes the extension plate at a lower substantially vertical position, and the extension plate is used when the lift floor moves up and down. It becomes a part of the lift floor by being horizontally extended rearward by a horizontal fixing mechanism, becomes a road plate between the lift floor and the road surface at the descending end, and is fixed substantially vertically downward by the vertical fixing mechanism at the rising end. A loading platform floor lifting device for a freight vehicle, characterized by being configured as a shock absorbing plate.