Control device for an air hoist

Details Control device for an air hoist Control device for an air hoist

1985-03-05

1986-01-28

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

254377, B66D 108, B66D 502

Patent

active

045666750

ABSTRACT:
A control device for an air hoist drives an air motor rotated by an air supply. The air hoist lifts or lowers a load by rotating a chain wheel. When the chain wheel rotates to lower the load, a small amount of air is supplied to the air motor in order to drive it in the normal lifting direction so that the braking force generated by the motor may reduce the load lowering speed and may gradually lower the load utilizing its own weight. Also, a mechanism for restraining the rotation in the normal lifting direction, when the chain wheel is under slow speed control, is actuated to restrain the rotation of the air motor, thereby stopping the chain wheel in a safe and sure manner without using a mechanical brake.

REFERENCES:
patent: 2874989 (1959-02-01), Reynolds
patent: 3032016 (1962-05-01), Smith
patent: 3125200 (1964-03-01), Kaman
patent: 3758079 (1973-09-01), Workman et al.
patent: 3960362 (1976-06-01), Griffiths et al.

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