Aeronautics and astronautics – Aircraft structure – Ice prevention
Patent
1993-12-21
1996-04-23
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft structure
Ice prevention
310245, B64D 1512
Patent
active
055096255
ABSTRACT:
A monitoring system is disclosed to automatically indicate excessive wear of electrical brushes in deicer assemblies for aircraft. In the preferred embodiment, the indicator system includes an electrical brush with an initially insulated wire embedded in it; and an electrical detection circuit, connected to the brush, with a warning device such as a light. When the brush becomes worn, through excessive "end wear" and/or "flank wear", the insulated wire becomes exposed and eventually stripped at the point of wear. This creates a conductive path from the electrical brush, through the bare wire spot, to the detection circuit. This turns on the warning device to indicate that the brush has become worn and needs replacement.
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Oullette David A.
Rogers, Jr. George D.
Barefoot Galen L.
Holland Donald S.
United Technologies Corp.
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