Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1986-08-04
1988-11-08
Cherry, Johnny D.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
414621, B25J 1500, B66C 316
Patent
active
047831065
ABSTRACT:
The invention provides a method and apparatus for controlling the level of clamping pressure applied by a clamp to a load. A pump, whose output is controlled by a normally open valve, establishes an initial level of clamping pressure. Through the use of a number of controllable fluid discharge systems, this pressure is automatically increased in increments depending upon the resistance of the load to the clamping pressure exerted. In a preferred embodiment, the controllable fluid discharge systems include discharge cylinders that contain predetermined volumes of fluid dischargeable by free-floating pistons residing therein. The outputs of the discharge cylinders are controlled by pressure-responsive valves to produce the desired relationship between clamp pressure and load rigidity.
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patent: 2545260 (1951-03-01), Cole
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patent: 3905635 (1975-09-01), Esser
patent: 4313633 (1982-02-01), Muntjanoff et al.
patent: 4351553 (1982-09-01), Rovetta et al.
patent: 4367891 (1983-01-01), Wauer et al.
patent: 4502723 (1985-03-01), Kuromoto
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