Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1982-06-02
1985-05-14
Krizmanich, George H.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254361, 74848, B66D 100, B66D 130
Patent
active
045167559
ABSTRACT:
A hydraulic control system for a spooling drum of a reversible hoisting winch of the type having a bidirectional hydraulic motor for driving the drum via two planetary drives in series, with the final planetary drive having a spring-loaded brake which, when actuated hydraulically, allows the drum to freewheel. The control system comprises a shuttle valve connected between a pair of conduits through which the bidirectional drive motor is placed in selective communication with a first pump and a fluid drain by a motor control valve. Pilot-operated from the shuttle valve is a selector valve which, in response to the pilot signal supplied when the motor is in rotation in either direction, delivers pressurized hydraulic fluid from a second pump to a lubricating circuit of the planetary drives. When the motor control valve is neutralized, setting the drive motor out of rotation, the selector valve delivers the output of the second pump to the brake for freewheeling the winch drum.
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patent: 4328954 (1982-05-01), Logus
patent: 4345742 (1982-08-01), Morfitt
Kabushiki Kaisha Komatsu Seisakusho
Krizmanich George H.
Wright Dirk
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