Safety brake device for theatre hoist
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United States of America Patent
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Oct 20, 2015
Grant Date -
Aug 22, 2013
app pub date -
Mar 18, 2013
filing date -
Sep 25, 2009
priority date (Note) -
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Abstract
A safety brake device for a theatre hoist to prevent the uncontrolled release of a load that is suspended above or below people includes an overrunning clutch and a torque disc. The torque disc only rotates with the overrunning clutch when the load is lowered, but must overcome friction forces applied to the surface of the torque disc to do so. The friction forces are constantly applied to the torque disc by maintaining friction material in contact with the torque disc. The friction material is a non-asbestos, non-metallic composite saturated with a lubricant.
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