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
1983-02-25
1984-08-28
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
254352, 254353, 254357, 74577M, 192 431, 192 93A, B66F 1900, B66F 330, G05G 112, F16D 1342
Patent
active
044680058
ABSTRACT:
A lever hoist comprises a change gear for driving a sheave for winding-up a chain or rope for a load, an operating lever rockably driven by a hand, winding-up and winding-off driving pawls engageable with teeth of the change gear and changeable in response to the purpose of hoisting or lowering the load, and a braking assembly for preventing the change gear from being driven by a gravity of the load and having a spring for releasing the braking assembly. According to the invention, the winding-up and winding-off driving pawls are formed in a unitary member pivotally secured to the operating lever and opposite portions of the pawls of the unitary member are engageable with a holding member urged by a spring, and a distance between a center of the pivot shaft and the portion associated with the winding-off driving pawl is larger than a distance between the center of the pivot shaft and the portion associated with the winding-up driving pawl, so that the winding-off pawl is urged against the teeth with a larger force than that of the winding-up pawl urged against the teeth. With such an arrangement, when a light load is hoisting up, the return movement of the operating lever does not carry along the change gear. When a light load which does not operate the braking assembly is lowering, the large urging force of the winding-off driving pawl prevents the change gear from rotating against the winding-off driving pawl.
REFERENCES:
patent: 2165984 (1939-07-01), Schroeder
patent: 2531668 (1950-11-01), Briggs
patent: 3107899 (1963-10-01), Henneman
patent: 3939729 (1976-02-01), Brockelsby
Hail III Joseph J.
Kabushiki Kaisha Kito
Levy Stuart S.
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