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
1987-08-28
1990-04-17
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
200298, 250211K, 318480, B66D 112, H02P 506
Patent
active
049173600
ABSTRACT:
An operating device for an electric chain block having an electric motor for a raising and lowering operation comprises a cylinder body interposed between one end of a chain for raising and lowering an object and a hook for hanging the object, a cylindrical grip fitted on the cylinder body and slidable upwardly and downwardly over predetermined distances relative to the cylinder body. The device further comprises a movement detecting device provided in the cylinder body for detecting upward and downward movements of the cylindrical grip, a moved distance detecting device provided in the cylinder body for detecting distances of the upward and downward movements of the cylindrical grip, and control device for energizing the electric motor to rotate it in normal and reverse directions in response to output of the movement detecting devce according to the upward and downward movements of the cylindrical grip, respectively, and controlling rotating speeds of the electric motor in response to output of the moved distance detecting device. Changing the raising and lowering operations and controlling the speeds of the operations are effected by an operator in the same sense as the operator raises and lowers a heavy object by himself.
REFERENCES:
patent: 2939680 (1960-06-01), Powell
patent: 3580157 (1971-05-01), Casebeer
patent: 3859617 (1975-01-01), Oka et al.
patent: 3902104 (1975-08-01), Freeman
patent: 3921959 (1975-11-01), Ulbing
patent: 3940110 (1976-02-01), Motoda
patent: 3948487 (1976-04-01), Motoda
patent: 3998432 (1976-12-01), Uldricks et al.
Hail III Joseph J.
Kabushiki Kaisha Kito
Levy Stuart S.
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