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
1983-08-19
1985-04-02
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
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
Hail III Joseph J.
Jillions John M.
Kabushiki Kaisha Kito
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