Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab
Patent
1982-03-10
1983-11-01
Spar, Robert J.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Grab
414627, B66F 1100
Patent
active
044127758
ABSTRACT:
A machine for assisting in the support of a load. A suction head having a downwardly facing opening supports the load. A conduit is connected to the hollow interior of the suction head and suction is impressed on the conduit so that the load can be held at the opening. A cable supports the suction head. A pressure cylinder is provided with a piston connected to urge the cable upwardly to support the suction head and the load. Fluid under pressure can be supplied to the cylinder at two selected pressures, one selected pressure being sufficient to substantially counterbalance the weight of the load and of the suction head, the other selected pressure being a lesser pressure sufficient to substantially counterbalance the weight of the suction head. A pressure operated switch is connected to be actuated by pressure in the conduit. Operation of the switch impresses the first selected pressure on the cylinder when the opening in the suction head is closed by the load and there is a reduced pressure in the conduit. The lesser selected pressure is impressed on the cylinder when the opening in the suction head is free of the load and the suction is released.
REFERENCES:
patent: 3933388 (1976-01-01), Conboy
Crowe Norman P.
Lampe Guy W.
Molitor Edwin A.
Multifold-International, Inc.
Pearce James W.
Schaeperklaus Roy F.
Spar Robert J.
Underwood Donald W.
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