Electric lamp and discharge devices – Spark plugs – Non-conducting material in or adjacent gap
Patent
1988-02-16
1989-03-21
DeMeo, Palmer C.
Electric lamp and discharge devices
Spark plugs
Non-conducting material in or adjacent gap
313131A, 313130, 313138, 313139, 116208, H01T 1352, H01T 1332
Patent
active
048146641
ABSTRACT:
A wear indicator for an igniter of the type having a center electrode, an annular ground electrode surrounding the center electrode, and a spark gap between the electrodes extending along a surface of a ceramic material. An annular wear indicating groove is formed in the ground electrode to indicate when the ground electrode is sufficiently eroded to necessitate replacement of the igniter. For a low voltage igniter the ceramic material at the spark gap is a semiconductor material which also is subject to erosion during use. A wear indicating groove also may be formed on the center electrode at a location which becomes exposed to indicate when the semiconductor material is sufficiently eroded to necessitate replacement of the igniter.
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P. 12, "Turbine Engine Igniter Application & Service Manual", 1982.
Champion Spark Plug Company
DeMeo Palmer C.
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