G - Physics – 01 – F
Patent
G - Physics
01
F
294/2
G01F 23/24 (2006.01) B25B 11/00 (2006.01) B65G 47/91 (2006.01) B66C 1/02 (2006.01) G01F 23/22 (2006.01)
Patent
CA 1248159
ABSTRACT OF THE DISCLOSURE 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 pro- vided with its own admission opening which communicates with the ambient atmosphere, such openings being openable and clos- able in unison. A high vacuum is built up in the vacuum ac- cumulator 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.
503982
Lewecke Maschinenbau G.m.b.h.
Mcfadden Fincham
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