Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab
Patent
1991-09-25
1994-02-08
Werner, Frank E.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Grab
294 641, 901 40, B66C 102
Patent
active
052844161
ABSTRACT:
The invention concerns a vacuum lifter to transport loads with an adhesion surface, comprising at least one suction head suspended from a hoist, said suction comprising at least one annular seal projecting from its suction side, the vacuum chamber(s) enclosed by the annular seal(s) communicating with a vacuum source, a valve furthermore being provided which can be switched between a suction position wherein the vacuum source communicates with the pressure chamber or vacuum chambers and a venting position wherein the communication with the vacuum source is interrupted and the vacuum chamber(s) is (are) vented or fed with compressed air. To assure venting or compressed-air supply immediately upon deposition of the load, the hoist is connected by a fitting 55 to the suction plate 5, said fitting being guided in vertically displaceable manner between two end positions, a sensor or a limit switch 59 being provided to detect the lower end position of the fitting 55 and so cooperating with a control means that following lowering of the fitting 55, the valve 20 shall be switched into the venting position if previously having been in the suction position.
REFERENCES:
patent: 2665013 (1954-01-01), Socke
patent: 3351370 (1967-11-01), Olson
patent: 3785691 (1974-01-01), Sperry
patent: 4114939 (1978-09-01), Burt
patent: 4266905 (1981-05-01), Birk et al.
Rechener Karl-Heinz
Schmidt Adolf
Berenato, III Joseph W.
Werner Frank E.
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