Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1995-03-16
1997-03-25
Noland, Kenneth
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
254 10B, A66F 706
Patent
active
056135750
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flat lift assembly with a lift platform, which is articulated on a lifting arm, which is pivotably supported on a base frame, wherein the lifting arm is pivotable about a pivot axis on the base frame by a drive means being connected with the lifting arm and wherein the drive means is connected with the lifting arm via an arm with a joint above the pivot axis of the lifting arm on the base frame, which joint lies in the reeled-in position of the lifting arm higher than the joint of the drive means on the arm.
Lift assemblies which should be constructed in that in the reeled-in position of the platform or the lift platform there remain no parts in a position projecting in height direction above the lift platform are known from WO 89/11437 or WO 89/11438 for example. This known devices are moving devices, with which a lifting of a motor vehicle about a predefined lift of stroke is possible, for example for changing the tires. The known constructions need a relatively large drive means, if loads should be lifted from the extended position of the drive means. Normally a load is grasped and lifted with such devices only after an predefined stroke.
A further lift assembly, which is known from DE-OS 36 04 456, allows to lift a platform via a scissors-type arrangement with hydraulic cylinder-piston units, which are arranged essentially parallel to a base area. With such scissor-type jacks the introduction of force is relatively unfavourable in the first part of the extending movement, so that a relatively great construction height is needed for lifting loads also from the reeled-in position. This is in analogeous manner also correct for the lift platforms guided by parallelogram arms, as they are known from U.S. Pat. No. 3,865,214 and U.S. Pat. No. 5,040,637. Also with such lift platforms, whose parallel guidance relatively to the floor is guaranteed by parallelogram arms, the introduction of force is very unfavourable in a first part of the extending movement so that great loads can only be lifted, if a relatively great construction height and an overdimensioned drive means are provided.
Therefore, the invention aims to provide a flat lift assembly as mentioned above, with which heavy loads may also be safely lifted with a substantial smaller construction height and smaller drive aggregates from the fully reeled-in position. The flat construction should make it especially possible that such a lift assembly may be installed also subsequently in floor constructions or ceiling constructions of a workshop without a strengthening of the floor or the ceiling being necessary and without being necessary to build openings in the floor or the ceiling for providing the necessary room for the drive aggregates.
For solving this problem the present lift assembly is characterized in that the arm is formed as a pivotable two-armed lever in the form of an articulated lever, whose pivot axis lying between the free ends of the two-armed lever is pivotably supported at the base frame via at least one further arm in height direction. Because the drive means is connected with the lifting arm via an arm with a joint above the pivot axis of the lifting arm on the base frame, a type of articulated lever is formed, wherein, if the drive means is extended, at the beginning a first partial rotation of the lifting arm is provided under the action of the articulated arm. The transmission of the articulated arm allows the use of a substantially smaller drive means and therefore a flatter construction, if the drive means should be arranged under the lift platform in the base frame. Because the drive means is connected under the joint of the arm on the lifting arm on the arm and because the same drive means is connected with its other end on the lifting arm it is secured that the joint of the drive means on the arm is always biased in direction to the base frame because of the introduction of force, whereas the other end of the arm, which is connected with the lifting arm above this joint, is moving up, when the lower j
REFERENCES:
patent: 3275297 (1966-09-01), Bloch
patent: 4248405 (1981-02-01), Kameda
patent: 4798266 (1989-01-01), Finkbeiner
Ackermann Inter Ltd.
Noland Kenneth
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