Hydraulic apparatus for grab device

Details Hydraulic apparatus for grab device Hydraulic apparatus for grab device

1975-09-29

1976-10-12

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

37183R, 214147G, 214656, 294 70, B66C 316

Patent

active

039853845

ABSTRACT:
A new and improved apparatus for a grapple or clam shell bucket having a plurality of pivoted tines or bucket elements which are actuated to a closed or holding position by a first predetermined hydraulic pressure and which are held in closed position by a second predetermined pressure, and wherein the second predetermined pressure has a value lower than the first predetermined pressure to provide sufficient flexibility to a hydraulic hose supplying the hydraulic pressures to facilitate reeling the hose while maintaining the grapple or clam shell bucket in closed position.

REFERENCES:
patent: 2557575 (1951-06-01), Simanek
patent: 3479077 (1969-11-01), Martin et al.
patent: 3574387 (1971-04-01), Hahn

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