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
1986-12-24
1988-05-24
Levy, Stuart 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
254328, 254349, 254368, 188 83, 188106F, 188170, B66D 526, F16D 6514
Patent
active
047461004
ABSTRACT:
In order to overcome the disadvantage of overspinning of a winch drum when a disconnect device adjacent the drum is disengaged, a drag brake apparatus is provided for limitedly restricting the rotation of the drum when an actuator having a braking element is continually urged against the drum by a spring. A control mechanism includes a control lever assembly movable to operate a hydraulic valve assembly for the primary control of the winch drum, and movable to operate an associated valve for controllably directing pressurized fluid to the actuator for supplementing the spring force. Thus, a first drag brake mode can be attained for substantially freespool operation of the drum, and a second drag brake mode can be attained for controlled load dropping operation of the drum.
REFERENCES:
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patent: 3848852 (1974-11-01), Therkildsen
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patent: 4406354 (1983-09-01), Barsted
patent: 4560148 (1985-12-01), Palmer
Cobb R. Paul
Davenport Richard G.
Smith Duane R.
Caterpillar Inc.
Levy Stuart S.
Matecki Katherine
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