Oil hydraulic circuit for gripping device

Details Oil hydraulic circuit for gripping device Oil hydraulic circuit for gripping device

1983-06-23

1985-03-05

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

91451, B66C 316, F15B 13042

Patent

active

045027234

ABSTRACT:
A gripping device includes a plurality of articulate gripping fingers coupled to a support structure turnable with respect to a neck structure. The articulate fingers respectively have first and second segments pivotally movable by oil hydraulic cylinders. Oil hydraulic pressure is applied to the oil hydraulic cylinders from an oil hydraulic pump. A pilot relief valve which can provide a variable relief pressure according to a pilot pressure, is provided on the discharge line leading from the oil hydraulic pump, and can be connected to a directional control valve to an oil hydraulic cylinder, which can provide a variable pilot pressure according to the extent of depression of a clamping force setting pedal provided in an operator's room.

REFERENCES:
patent: 3185175 (1965-05-01), Plate
patent: 3937128 (1976-02-01), Hicks et al.
patent: 4017221 (1977-04-01), Dezelan
patent: 4317466 (1982-03-01), Ikeda et al.
patent: 4452479 (1984-06-01), Terai et al.

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