Land vehicles – Wheeled – Attachment
Patent
1993-07-23
1995-03-21
Johnson, Brian L.
Land vehicles
Wheeled
Attachment
2807661, 254423, B60S 912
Patent
active
053989694
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for swinging up a vehicle or truck support, which can be moved in and out hydraulically, around a swivelling axis that is mounted stationarily to the vehicle.
When larger loads are to be lifted by a loading crane mounted on a truck, it is customary to take the load off of the wheels of the truck by means of telescopically extendable supports. These supports, which are usually hinged to booms which can be extended to the side, are supposed to be swung upwardly, if possible, when the vehicle is travelling. As the height of the vehicle increases and the mass of the support increases, such swivelling is soon impossible without the aid of machinery.
SUMMARY OF THE INVENTION
The object of the invention is to enable the support to swing up automatically with as little additional machinery as possible, in particular without additional hydraulics. This problem is solved by the invention in that a free end of the support is hinged to a telescopic rod, which exhibits limited retractability and which can be swivelled at a swivel member, which can be swivelled around an axis mounted stationarily on the vehicle up to a stop, which is mounted stationarily on the vehicle, in the direction of the support.
The swivel member provided according to the invention allows the telescopic rod steering the support upwardly to move first around its swivel axis at the swivel member and then together with the swivel member around its swivel axis, a feature that virtually doubles the amount of swivelling that is possible, as shall be explained in detail below.
One particular advantage of the proposed device lies in the fact the force to swing up the support is delivered by the hydraulics necessary in any event to retract the support. The proposed device enables not only a simple swinging up of the support but also avoids the risk of an uncontrolled dropping of the support, which in view of its mass ranging on the order of 100 kg should not be underestimated.
BRIEF DESCRIPTION OF THE DRAWINGS
Other details of the invention are explained with reference to the drawings, wherein:
FIGS. 1a-1d are elevation views depicting a first embodiment of the device according to the invention, in four respective stages of motion thereof;
FIG. 2 is an enlarged view of that part of the device of FIG. 1a that determines the kinematics thereof; and
FIGS. 3a-3d are schematic drawings of the sequence of motion of another embodiment.
DETAILED DESCRIPTION OF THE INVENTION
In order to swing up a support 1 of a truck, the support is rendered swivelable around a bolt forming a first swivel axis 5 by loosening another bolt, which in the working position according to FIG. 1a holds a bore 8 in the support 1 and a bore 8' in a supporting structure 9 mounted stationarily on the truck in alignment with one another. The support 1 then swivels into the position shown in FIG. 1b and in which its center of mass is below the swivel axis 5. To move from such position into that of FIG. 1c, it is merely necessary to further shorten the support 1 by operating hydraulics thereof. This shortening results in a swivelling of the support, because the support 1 is hinged at point or third swivel axis 10 to a telescopic rod 2 which is in its shortest position when the support is swung up. Telescopic rod 2 is connected in turn, as is clear in the detail view of FIG. 2, by way of a fourth swivel axis 11 to a swivel member 3 which can be swivelled around a second swivel axis 4 mounted stationarily on the vehicle.
In the position shown in FIG. 1b, the axes 5, 11 and 10 form a triangle, in which the connecting lines of the axes 5 and 11 or 11 and 10 have constant lengths. Shortening the base line, thus the distance of the axes 5 and 10, by pulling the support 1 in even further, results necessarily in a decrease in the angle between the connecting lines of the axes 5 and 11 on the one hand, and 11 and 10 on the other hand. Swivelling the swivel member 3 during this transition from FIG. 1b to FIG. 1c is ruled out by the f
REFERENCES:
patent: 2837312 (1958-06-01), Trouche
patent: 3549125 (1970-12-01), Hamilton
patent: 3627268 (1971-12-01), Wills
patent: 3826450 (1974-07-01), Currey et al.
patent: 4593932 (1986-06-01), Miyazawa
patent: 4865295 (1989-09-01), Holloway
patent: 5013011 (1991-05-01), Halloway
Johnson Brian L.
Palfinger Aktiengesellschaft
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