Electric hoist

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

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Details

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

Patent

active

045083185

ABSTRACT:
An electric hoist includes an electric motor, a driving shaft connected to a rotor shaft of said electric motor, 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 between the driving shaft and the rotor shaft of the motor is arranged an overload safety device comprising a casing fitted through a one-way clutch onto the rotor shaft, a first support member fixed to the rotor shaft, a second support member slidably fitted on the driving shaft, a retainer member fixed to the casing, friction plates respectively arranged between the first and second support members and between the second support member and the retainer member, and dish-shaped springs for urging the retainer member against the first support member, thereby transmitting torque through one of the friction plates in raising a load and through both the friction plates in lowering the load and effecting such a changing-over by means of the one-way clutch. 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 raised 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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