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
1981-05-26
1984-05-08
Taylor, Billy S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
192 17A, 254310, 254315, 254322, 254347, 254370, B66D 114, B66D 508, B66D 526
Patent
active
044470444
ABSTRACT:
A control system for one or more hydraulically driven crane winch drums each having a hydraulically actuated clutch and a brake. Included is a negative braking mechanism having a brake cylinder of the single-acting, spring-return type for normally holding the brake applied by the force of the spring and releasing the brake on fluid pressure actuation. A mode selector valve selectively delivers hydraulic fluid under pressure from two separate sources to the clutch and the brake cylinder in order to condition the winch for a selected one of winching, brake-locking, and free-fall modes. The mode selector valve causes the negative braking mechanism to release the brake in the free-fall mode, so that a positive braking mechanism is also provided to permit the operator to arrest the free fall of the load, or the free running-out of the cable, in an exact position desired.
REFERENCES:
patent: 3780990 (1973-12-01), Edlund et al.
patent: 3871714 (1975-03-01), Behrend
patent: 4088305 (1978-05-01), Wineburner et al.
patent: 4185520 (1980-01-01), Henneman et al.
patent: 4312497 (1982-01-01), Whaley
Kabushiki Kaisha Komatsu Seisakusho
Taylor Billy S.
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