Material or article handling – Apparatus particularly adapted for charging or discharging a... – Including one or more movable sites
Patent
1989-11-28
1991-05-28
Werner, Frank E.
Material or article handling
Apparatus particularly adapted for charging or discharging a...
Including one or more movable sites
187 859, B66F 702
Patent
active
050189255
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lifting device for a platform for storage of motor vehicles.
Storage facilities for motor vehicles are known wherein the vehicles are stored on lifting platforms which are raised and lowered to a drive-in plane, as required, (Wohr Auto-Parksysteme Combilift 543 prospectus of Otto Wohr GmbH, February 1985).
Lifting devices are known wherein the platforms are held at all four corners on a chain or cable hoist, with the chain or cable hoists which engage the four corners being wound up and down synchronously. This requires a high degree of constructional expenditure since either each cable has to be provided with its own winding-up device or extensive deflection pulleys have to be arranged at the top for this purpose.
It is, furthermore, known to construct these individual cable hoists in accordance with the pulley block principle such that the chain or cable hoists are guided around additional deflection pulleys and so the forces required for the lifting can be reduced by increasing the winding-up path of the chain and cable hoists. When four separate chain or cable hoists are used, a considerable winding-up capacity is required, i.e., such arrangements involve high structural expenditure, apart from the fact that it is also difficult to ensure synchronous lifting motion of the four chain and cable hoists.
A motor vehicle parking system is described in WO87/0685 wherein the individual platforms are raised via carrying chains engaging one side of the platform, while a guiding chain above the platforms runs along the opposite side of the platform and is guided via deflection pulleys below the platform transversely to the latter.
In FR-A-713691, a lifting platform for motor vehicles is described which hangs in two carrying chains of loop-like design. Perpendicular supports are arranged on both sides of the platform to guide this platform and require considerable constructional expenditure.
DE-A-2 015 727 shows a parallel drive for lifting ramps or the like wherein two carrying chains are arranged on both sides of the lifting ramp or platform, each of which runs from a top point of attachment over two spaced deflection pulleys to a bottom point of attachment. The points of attachment are of stationary design; the lifting motion is brought about by the deflection pulleys being driven by a motor. For this purpose, the drive means must be arranged on the platform itself.
The object of the invention, proceeding from the lifting device known from FR-A-713691, is to create with simple structural means a lifting device wherein unwanted tilting of the platform about a platform axis extending transversely to the carrying chains is prevented, without elaborate guiding rods or the like being required therefor.
It is advantageous for the two deflection pulleys to be arranged at the front and rear corners of the platform. In this way, the vertical parts of the carrying chain can be arranged outside of the platform at the front and rear ends so that they are guided in the region of a frame or a wall of a building in which the installation is arranged. It is, furthermore, advantageous for the drive wheels of the carrying chains arranged on both sides of the platform to be held on a common drive shaft. This results in synchronism on both sides of the platform.
After winding around the drive wheels, the carrying chains can hang down loosely with their residual strand from the drive wheels. It is then advantageous for the ends of the residual strand to be held stationarily so that the residual strand forms between the drive wheel and the point of attachment a loop in which preferably a downwardly tensioned chain wheel is held. This tension can be achieved by, for example, simply suspending a counterweight on the loosely guided chain wheel.
If the gear which meshes with the toothed rack or the guiding chain has a pitch diameter which is identical with the diameter of the deflection pulley to which it is connected for common rotation, the inclination of the platform is maintained during the raising and lo
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Leaflet WOHR Auto-Parksystem COMBILIFT 543-Feb. 1985.
Lipsitz Barry R.
Otto Wohr GmbH
VandenBosche John
Werner Frank E.
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