Hoist

Details Hoist Hoist

1983-08-19

1985-01-29

Jillions, John M.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

254903, 192 483, 192 4892, 192 56R, 464 37, 464 46, B66D 114, F16D 700

Patent

active

044961367

ABSTRACT:
A hoist includes a shaft driven by external force, a driving shaft connected to the shaft, a reduction gear train for transmitting rotation of the driving shaft to a load sheave, and a mechanical brake assembly in the reduction gear train. According to the invention in the reduction gear train is arranged an overload safety device comprising a driven gear having a one-way clutch and rotatively driven by the driving shaft and radially inward and outward dual friction plates located between the driven gear and an element of the mechanical brake assembly so as to transmit torque through the radially outward friction plates in winding-up and through both the radially inward and outward friction plates in winding-off. With this arrangement, the electric hoist according to the invention is able to automatically prevent lifting, lowering and dragging a load under overload condition, and enables the once lifted load to be securely lowered irrespective of its light or heavy weight.

REFERENCES:
patent: 2501096 (1950-03-01), Robins et al.
patent: 3072234 (1963-01-01), Maurice et al.
patent: 3741527 (1973-06-01), Dahl
patent: 3953000 (1976-04-01), Zorbaugh
patent: 4023744 (1977-05-01), Shutt
patent: 4348011 (1982-09-01), Honda

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