Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1996-01-04
1999-04-06
O'Shea, Sandra
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313118, 313123, 313139, 313140, 313143, H01T 1320, H01T 1346, H01T 1300, F02M 5706
Patent
active
058923195
ABSTRACT:
A spark plug derives an extended lifetime because a large plurality of sharp edges are provided on the center electrode, the ground electrode, or both to enhance spark propagation. In a first embodiment, the ground electrode has a conventional cantilever shape, but the center electrode extends into coplanar relation to a distal surface of the electrode so that sparks propagate from the cylindrical side walls of the center electrode. In variations of the first embodiment, the number of cantilevered ground electrodes is increased, with the ground electrodes being circumferentially and equidistantly spaced about the center electrode. In another embodiment, the ground electrode has an annular configuration and includes a cylindrical annular wall spaced radially outwardly of the cylindrical sidewall of the center electrode, in concentric relation to the center electrode. Variations of the second embodiment include screw threads, knurls, and various projections formed on the ground electrode, the center electrode, or both.
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patent: 1334135 (1920-03-01), Cuevas
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patent: 5502352 (1996-03-01), Katoh et al.
Haynes Mark
Lisa Steven G.
O'shea Sandra
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