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
1979-10-12
1982-01-26
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
91 45, 192 3R, 254355, 254351, B66D 122
Patent
active
043124976
ABSTRACT:
A grooved winch drum is driven by a reversible hydraulic motor. A pump supplies fluid to the motor through a system using an electrically controlled four-way, flow direction valve associated with a counterbalance valve and a manually adjustable flow control valve. The four-way valve controls the direction of drum rotation and the flow control valve regulates the drum rotational speed. The motor drives the drum through a planetary gearing which includes a ring gear normally held from rotation by a friction clutch band, spring biased into engaged position but releasable by the application of hydraulic pressure from a separate pump supplied through a second system that includes a second flow control valve. The flow control valves for the motor and clutch are each associated with a cam operator mounted on a shaft rotated by a lever which also carries a three position electrical switch to control the four-way valve. The operator can use this control lever to rotate the winch drum over a continuous speed range in either direction or permit free drop of loads independent of the winch motor. The counterbalance valve provides a fail-safe device in case of fluid pressure drop in the drive system.
REFERENCES:
patent: 1946145 (1934-02-01), Johnson
patent: 1971351 (1934-08-01), Osgood
patent: 2163231 (1939-06-01), Smaltz et al.
patent: 2986884 (1961-06-01), Smith
patent: 3125819 (1964-03-01), Kaufmann
Morris Whaley, Inc.
Taylor Billy S.
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