Safety device for an air balancing hoist

Details Safety device for an air balancing hoist Safety device for an air balancing hoist

1994-08-02

1996-09-10

Mansen, Michael R.

Implements or apparatus for applying pushing or pulling force

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

Device includes rotatably driven, cable contacting drum

188185, 188342, 254331, 254360, B66D 100, B66D 110, F16D 5100

Patent

active

055538320

ABSTRACT:
An air balancing hoist is described having an axially movable drum reel supported on a ball nut and screw with a piston defining a pressure chamber containing regulated air pressure acting on one end of the drum reel to counter the unwinding force of a load supported on a cable wound on the drum reel. A centrifugal brake retards drum rotation when there is a sudden release of the load tending to cause too rapid wind up of the cable by the regulated air pressure applied on the piston.

REFERENCES:
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patent: 2896912 (1959-07-01), Faugier et al.
patent: 3286989 (1966-11-01), Bangerter et al.
patent: 3457837 (1969-07-01), Powell
patent: 3504891 (1970-04-01), Ulbing
patent: 3715016 (1973-02-01), Frieder
patent: 4258832 (1981-03-01), Thorp
patent: 4530474 (1985-07-01), Nederman
patent: 4533026 (1985-08-01), Bernard
patent: 4846313 (1989-07-01), Sharp
patent: 5439200 (1995-08-01), Braesch et al.

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