Vehicle-mounted retrieval winch and control means therefor
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United States of America Patent
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-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Aug 24, 1987
filing date -
Aug 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compact retrieval winch and a control therefor are mounted on a recovery vehicle for pulling an immobilized heavy vehicle, such as a military tank, back onto suitable terrain. The winch comprises a support structure, a rotatable hollow cable drum with a cable wrapped thereon, a reversible variable displacement hydraulic motor for driving the drum through a multi-stage power transmission mechanism located within the drum, and a drum brake. The winch control comprises a sensing mechanism for sensing the number of layers of winch cable wrapped on the drum while the drum is operating in the pulling mode and the cable is connected to the tank. The winch control further comprises a hydraulic control circuit, including a constant line pull valve assembly responsive to movement of the sensing mechanism, for controlling the displacement of the hydraulic motor so as to maintain constant maximum cable pulling force regardless of the number of layers of cable on the cable drum.
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