Manual hoist with overload preventer

Details Manual hoist with overload preventer Manual hoist with overload preventer

1987-08-26

1988-09-06

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, 254357, 254903, B66D 114, G05G 112

Patent

active

047687541

ABSTRACT:
A manual hoist with overload preventer wherein rotation in the winding direction under overload is automatically arrested; however, when an overload develops after hoisting or pinching of a load, unwinding is possible. The apparatus includes an operation ring, and a friction ring and a drive ring both being capable of engaging the operation ring. When the driving ring is turned in the winding direction, the operation ring remains engaged with both the friction ring and the drive ring, enabling the relative rotation of the drive ring and the friction ring. When the drive ring is turned in the unwinding direction, the drive ring and the friction ring are rotated as a unit through the operation ring.

REFERENCES:
patent: 3741527 (1973-06-01), Dahl
patent: 3776514 (1973-12-01), Eggleton et al.
patent: 4251060 (1981-02-01), Suzuki et al.
patent: 4469308 (1984-09-01), Nakamura et al.
patent: 4474360 (1984-10-01), Maeda
patent: 4483519 (1984-11-01), Nakamura
patent: 4512555 (1985-04-01), Nakamura
patent: 4664357 (1987-05-01), Nishimura

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