Safety device for an air balancing hoist
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United States of America Patent
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Sep 10, 1996
Issued Date -
N/A
app pub date -
Aug 2, 1994
filing date -
Mar 12, 1993
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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.
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