Modulation control valve for hydraulically operated winch

Details Modulation control valve for hydraulically operated winch Modulation control valve for hydraulically operated winch

1974-07-15

1976-11-16

Cohan, Alan

Fluid handling

Systems

Supply and exhaust

192 12C, F15B 1306

Patent

active

039917878

ABSTRACT:
A hydraulically operated winch of the type adapted for logging or towing operations and having a rotatable winch drum about which a cable or line is entrained, a normally disengaged clutch being hydraulically operable to provide a coupling between a power input member and a winch drum drive shaft, a normally engaged friction brake normally securing the winch drum drive shaft against rotation while being hydraulically disengagable and a normally engaged clutch providing a selective coupling between the winch drum drive shaft and the winch drum. A modulating control valve for the winch includes a valve body having an inlet chamber in communication with a source of fluid under pressure, a single regulating spool in the valve being operable to selectively communicate fluid under pressure from the inlet chamber with respective actuating chambers for the brake and the two clutches, the valve also including a modulating valve responsive to the positioning of the regulating spool for modulating fluid pressure in the inlet chamber.

REFERENCES:
patent: 3225781 (1965-12-01), Kruger et al.
patent: 3295420 (1967-01-01), Gleason
patent: 3468194 (1969-09-01), Horsch et al.
patent: 3529702 (1970-09-01), Eckstein
patent: 3722543 (1973-03-01), Tennis
patent: 3756564 (1973-09-01), Murray et al.

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