JPS628352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting and lowering device for a trailer that transports long and extremely heavy raw materials and products.

Traditionally, trailers for transporting long and heavy objects are
Various removable attachments such as containers, flats, and pallets were used to load and transport various long and heavy objects.

However, in order to attach or detach these attachments to a trailer, it is necessary to lower the chassis of the trailer, crawl under the attachment, and then raise and lift it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for raising and lowering the chassis of a trailer by using a piston engine to adjust the height of the wheels of the trailer and changing the stroke by hydraulic and pneumatic operations.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below with reference to the drawings showing one embodiment.

1 and 2 show a trailer 2 being towed by a towing vehicle 1, in which a plurality of elevating devices 4 of the present invention are arranged in two stages at the rear of a chassis frame 3. .

The lifting devices 4 are each installed on beams 5 installed on the chassis frame 3.

Frames 6, 6 are fixed to both sides of the lower end of the beam 5, and a moving port 8 for a piston engine 7 is formed in the center.

Each of the frames 6, 6 has a wheel 9 at the tip,
The inner parts of brackets 10, 10, which rotatably hold the bracket 9, are pivotally supported.

The piston engine 7 is disposed passing through the moving port 8, and pivotally supports connecting portions 13, 13 provided on the upper portions of the brackets 10, 10 on the cylinder 11 side and the piston 12 side.

Incidentally, since the piston engine 7 is operated by hydraulic pressure, air pressure, etc., a power circuit such as a hydraulic circuit is provided, although not shown.

Further, the towing vehicle 1 is equipped with a lifting mechanism 14 at a position where it is connected to the trailer 2.

This elevating mechanism 14 has a post 15 erected upward at the center position of the front end of the chassis frame 3.
Two frames 16, 16 are provided protruding in the front direction, and they are attached to the post 15 erected in the upward direction.
It is arranged so that it is on both sides of the front.

A bracket 18 is provided protruding from the rear end of the chassis 17 of the towing vehicle 1. The lower end of this bracket 18 is pivotally connected to the frame 16, and the upper end of this bracket 18 and the post 15 are connected to each other.
A piston engine 19 is mounted on the shaft at the upper end, and the piston 20 side is mounted on the upper end of the bracket 18.
The cylinder 21 side is pivotally supported by the upper end of the post 15, respectively.

Note that this piston engine 19 is also operated by hydraulic pressure, air pressure, etc., and is therefore provided with a power circuit such as a hydraulic circuit, although not shown.

A driver's seat 22 that can move up and down and rotate is installed at one of the left and right positions at the front end of the chassis frame 3.

Next, the operating state of the trailer lifting device of the present invention will be explained based on the above-mentioned configuration. .

First, when attaching an attachment (not shown) such as a pallet to the trailer 2, the chassis frame 3 is lowered.

In that case, the piston engine 7 of the lifting device 4 is activated, the piston 12 is pushed into the cylinder 11, and its stroke is shortened.

Then, the piston engine 7 moves the moving port 8 of the beam 5
At the same time, the bracket 10 and the wheel 9 held thereon are raised using the shaft attachment part of the frame 6 as a fulcrum.
, they move from the position indicated by the one-dot chain line to the position indicated by the two-dot chain line shown in FIG. 3, and the rear portion of the chassis frame 3 descends.

As the rear part of the chassis frame 3 descends, the piston engine 19 of the lifting mechanism 14 also operates in the front part of the chassis frame 3, and the piston 20 is pushed into the cylinder 21 and its stroke is shortened.

Although details will not be described here, the chassis frame 3 moves from the position indicated by the one-dot chain line to the position indicated by the two-dot chain line, as shown in FIG. 4, and the front portion of the chassis frame 3 also descends.

In this state, the tow vehicle 1 is driven and the trailer 3 is pushed under an attachment (not shown) such as a pallet carrying a long or heavy object.

Therefore, the piston engine of the lifting device 4 is operated again to push the piston 12 out of the cylinder 11 and extend its stroke.

Then, the piston engine 7 moves down the moving port 8 of the beam 5 in the opposite manner to that described above, and uses the shaft attachment part of the frame 6 as a fulcrum to push down the bracket 10 and the wheels 9 held thereon, so that they are moved as shown in FIG. The chassis frame 3 moves from the position indicated by the two-dot chain line to the position indicated by the solid line, and the rear portion of the chassis frame 3 rises.

As the rear part of the chassis frame 3 rises, the front part of the chassis frame 3 also moves from the position of the two-dot chain line shown in FIG. The front part of the chassis frame 3 also rises.

That is, the front and rear parts of the chassis frame 3 are raised horizontally, and the attachments (not shown) are lifted and attached to the trailer 2.

The reason why the chassis frame 3 does not recover to the position indicated by the dashed-dotted line in the raised state is that the load of an attachment (not shown) is applied thereto.

Furthermore, in addition to attaching and detaching various attachments to and from the trailer 2, the trailer elevating device of the present invention also uses the chassis frame 3 to prevent the trailer 2 from riding on convexities on the road surface when the trailer 2 is towed by the towing vehicle 1.
When the trailer 2 is stopped on a slope, the lifting and lowering states of the plurality of lifting devices 4 can be set separately, and the trailer 2 can be stopped while remaining horizontal on the slope. In addition to the above, it can also be used for various other purposes.

As described above, according to the trailer elevating device of the present invention, the chassis of the trailer can be freely raised and lowered by using a piston engine and changing its stroke through hydraulic and pneumatic operations. The piston engine 7 is always disposed inside the wheels 9, 9 and passes through the moving port 8 formed in the beam 5, so it can be used by setting the state as appropriate. It has very excellent effects, such as making the entire device more compact and protecting it from obstacles on the road surface.

[Brief explanation of the drawing]

The figure shows one embodiment of the invention,
Fig. 1 is a side view of a towing vehicle and a trailer being towed by it, Fig. 2 is a plan view of a towing vehicle and a trailer being towed by it, and Fig. 3 is a lifting/lowering system of the present invention installed at the rear of the trailer. FIG. 4 is an explanatory diagram of the device, and is an explanatory diagram of the lifting mechanism installed at the connection position between the towing vehicle and the trailer. 3... Chassis frame, 5... Beam, 7...
...Piston engine, 9,9...Wheel, 10,10...
... Bracket, 13, 13... Connection part.

Claims (1)

[Claims] 1 A set of two wheels 9, 9 are arranged at an appropriate interval in the lower part of the chassis frame 3, and both wheels 9, 9 are rotatably held by brackets 10, 10. bracket 10,10
It is attached to the beam 5 installed on the chassis frame 3 so that the inside part thereof is rotatable, and furthermore, it passes through the moving opening 8 formed in the beam 5 between the connecting parts 13, 13 provided at the upper part of both the brackets 10, 10. A trailer elevating device characterized in that the piston engine 7 is provided so as to be extendable and retractable.