Electrical brush-wear indicator

Details Electrical brush-wear indicator Electrical brush-wear indicator

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.

REFERENCES:
patent: 3908142 (1975-09-01), Gaudry
patent: 4316186 (1982-02-01), Purdy et al.
patent: 4542374 (1985-09-01), Kollmannsberger
patent: 4636778 (1987-01-01), Corkran et al.
patent: 4652783 (1987-03-01), Cheesmore
patent: 4837920 (1989-06-01), Sweet et al.
patent: 5020741 (1991-06-01), Ziegler et al.
patent: 5131812 (1992-07-01), Boyd et al.

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