JPH0120197Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention was developed to maintain the horizontal loading platform of a transportation vehicle in order to prevent the cargo from collapsing due to the tilting of the loading platform when lifting or lowering a load to a high place using a transportation vehicle on a slope. It is related to the device.

[Conventional technology]

As a conventional device for leveling the loading platform of a transport vehicle, the Utility Model Application No. 1983-11 proposed earlier by the present applicant et al.
There is something disclosed in No. 56181. In this method, two guide rods are provided between the main body frame of the carrier and the loading platform, and support rods are provided that are guided at one end by the guide rods and intersect with each other, so that the intersection point can be freely rotated. The loading platform can be raised and lowered by connecting the supporting rods and extending and contracting one of the supporting rods using a driving device, and by providing a second driving device that supports both ends of these intersecting supporting rods. It is designed to maintain horizontality by tilting in the opposite direction to the slope on which the transport vehicle travels.

[Problem that the invention attempts to solve]

In the above conventional technology, there is a problem that each drive device is large because the drive device for lifting and lowering the platform and the drive device for tilting the platform and maintaining it horizontal are provided separately. The problem is that the piping and wiring for driving the second drive device that tilts the shaft must be installed taking into account the expansion and contraction of the support rods, since the drive device is installed between two support rods. There is.

[Means for solving problems]

This idea was made in view of the above-mentioned circumstances, and the specific technical means is that both ends of two support rods are rotatably attached to the main body frame and the loading platform, and two support rods are separately provided. A rod intersects with the support rods, one end of which is rotatably attached to the main body frame, and the other end of the rod is movably and rotatably attached to a fixed guide provided on the loading platform. A fluid cylinder, one end of which is supported by the body frame, is connected to each of the two support rods so that each of the two support rods can rotate freely around the attachment point with the body frame. be.

[Effect]

According to the above-mentioned technical means, since each support rod freely rotates in the vertical direction around the attachment point rotatably attached to the main body frame by the fluid cylinder, fluid is supplied and discharged to and from the fluid cylinder. By adjusting the amount, in addition to being able to lift the loading platform in a horizontal state, it is also possible to freely tilt it forward or backward in the direction opposite to the direction of inclination of the inclined surface of the transport vehicle. Therefore, the cargo platform can always be kept horizontal even while driving.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

The transport vehicle 1 is composed of a main body frame part 2 and a loading platform 3, and the main body frame part 2 is provided with a crawler running part 4, a control part 5, etc.

A support rod 6 is provided between the main body frame portion 2 and the loading platform 3.
is provided. These support rods 6 have one ends of the two left and right support rods 6 rotatably supported on fixed bearings 7 provided at the rear of the main body frame portion 2 on the opposite side from the control portion 5, and the other ends of the support rods 6 are rotatably supported by the control rods 6. An inner frame 9 rotatably supported on a fixed bearing 8 provided at the lower part in front of the loading platform 3 on the side of the section 5, and a left and right 2 that is different from the support rod 6.
One end of the two support rods 10 is rotatably supported by a fixed bearing 11 provided in front of the main body frame part 2 on the side of the control part 5, and a rotatable roller 12 is provided at the other end to support the support rod 10 at the rear of the loading platform 3. Fixed guide 13 provided at the bottom
An outer frame 14 is formed so as to be movable. These inner frame 9 and outer frame 14 are attached so as to rotate about the fixed bearings 7 and 11 as fulcrums while intersecting with each other. Further, fixed bearing crosspieces 15 and 16 are provided below the respective support rods 6 forming the inner frame 9 and the outer frame 14, and fixed bearing crosspieces 17 and 18 are supported by the fixed bearing crosspieces 15 and 16, respectively. There is. The fixed bearings 17, 18 and the rods 21, 22 of the fluid cylinders 19, 20 are rotatably mounted, and the other ends of the fluid cylinders 19, 20 are fixed bearings 23, 24 provided on the main body frame portion 2.
It is rotatably mounted.

According to this embodiment configured as described above, as illustrated in FIG. The front end on the side of the control section 5 is lifted up as a fulcrum, and the loading platform 3 is tilted rearward. On the other hand, as illustrated in FIG.
1 as a fulcrum, the rear end on the side opposite to the control section 5 is lifted to tilt the loading platform 3 forward. At this time,
The roller 12 at the tip of the support rod 10 is a fixed guide 13
Move inside from the back to the front.

Next, when lifting the loading platform 3 horizontally upward, fluid is simultaneously supplied to the two fluid cylinders 19 and 20. Then, the inner frame 6 and the outer frame 14 simultaneously rotate upward around the fixed bearings 7 and 11, respectively, and simultaneously lift the lower portions of the front and rear ends of the loading platform 3 upward, thereby maintaining the loading platform 3 horizontally. The operation at this time is a combination of each of the individual operations described above. When it is desired to stop at a predetermined height, it is sufficient to stop the supply of fluid to the two fluid cylinders 19 and 20 at the same time.

Note that the shape and attachment of the inner frame 9 and the outer frame 14 are not limited to those in the above embodiments, and may be used as long as the loading platform 3 can be freely moved to a predetermined position, or the fixed guide 13 can be moved. need not be the rollers 12, but may be other rotating pairs or sliding pairs. Further, the fluid cylinder 19,
20 may be driven manually using a lever (not shown) provided in the control unit 5, or automatically using a horizontal sensing device 25 installed on the loading platform 3.

[Effect of idea]

As is clear from the above explanation, in order to maintain the loading platform horizontally when the transport vehicle is running on a slope or stopped, it is easy to maintain the loading platform horizontally by simply driving the fluid cylinder installed on the opposite side of the slope. In addition, by driving two fluid cylinders simultaneously, it is possible to lift the loading platform to a high position and maintain the loading platform horizontally. Furthermore, since lifting and tilting of the loading platform can be performed simultaneously or separately using two fluid cylinders, the diameter of each cylinder can be reduced. In addition, the fluid cylinder is
Since it is attached to the main body frame, maintenance of piping, wiring, etc. for driving the fluid cylinder becomes easy, and safety is improved.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a partially omitted front view, Fig. 2 is a partially omitted right side view, Fig. 3 is an explanatory diagram showing the operation of the inner frame, and Fig. 4 is an outer frame. An explanatory diagram showing the operation of. 1... Transport vehicle, 2... Body frame part, 3...
Loading platform, 6, 10...Support rod, 13...Guide, 1
9, 20...Fluid cylinder.

Claims (1)

[Scope of utility model registration request] Both ends of two support rods are rotatably attached to the main body frame portion and the loading platform, two separately provided support rods are crossed with the support rods, one end is rotatably attached to the main body frame portion, and the other end is rotatably attached to the loading platform. A fluid cylinder, which is movably and rotatably attached to a fixed guide provided in the main body frame portion, is attached to each of the two support rods and the two separately provided support rods, and one end of the fluid cylinder is supported by the main body frame portion, respectively. A loading platform leveling device for a transport vehicle, characterized in that two support rods are connected so as to be rotatable about the attachment point with the main body frame.