Handling: hand and hoist-line implements – Utilizing fluid pressure – Frames
Patent
1986-03-06
1987-06-23
Marbert, James B.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Frames
294 641, B66C 102, B25B 1100
Patent
active
046747850
ABSTRACT:
A vacuum lifting arrangement for flat workpieces, such as lumber boards, lumber planks and the like includes a vertically and horizontally displaceable housing which forms a vacuum chamber, and an elastic sealing element arranged at the underside of the housing for conformingly contacting the workpiece and constituted either by a foamed material mat with suction apertures or by individual suction cups. The vacuum chamber is constructed as a vacuum accumulator and a valve plate is interposed between the housing and the sealing element. The interior of the valve plate is subdivided into a plurality of individual vacuum compartments each equipped with a valve and is connected with the vacuum chamber by a suction opening which can be selectively opened and closed. Each of the vacuum accumulator and the valve plate is provided with its own admission opening which communicates with the ambient atmosphere, such openings being openable and closable in unison. A high vacuum is built up in the vacuum accumulator and is supplied in the case of need through the individual vacuum compartments to the suction apertures or suction cups. The valves are automatically opened or closed in dependence on the configuration of the workpiece so that the suction portions of the sealing element which are fully covered by the workpiece are subjected to the full vacuum and the remaining suction portions are cut off from the vacuum by the action of the respective valves, thus avoiding vacuum loss and operation disruptions.
REFERENCES:
patent: 3865359 (1975-02-01), Caroli
patent: 4362461 (1982-12-01), Cathers
Lewecke Maschinenbau GmbH
Marbert James B.
Teltscher Erwin S.
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