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
1987-08-24
1989-08-08
Hail, III, Joseph J.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254326, 254344, 254356, 254361, B66D 108, B66D 122, B66D 150
Patent
active
048545473
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.
REFERENCES:
patent: 2391580 (1945-12-01), Mackmann et al.
patent: 3309066 (1967-03-01), Carlson et al.
patent: 3319492 (1967-05-01), Magnuson
patent: 3606257 (1971-09-01), Wilson
patent: 4508281 (1985-04-01), Plater
Hail III Joseph J.
Harnischfeger Corporation
Ruppin Richard C.
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