Spark plug with riveted sleeve

Details Spark plug with riveted sleeve Spark plug with riveted sleeve

2008-09-06

2010-11-16

Won, Bumsuk (Department: 2889)

Electric lamp and discharge devices

Spark plugs

C313S141000, C313S143000

Reexamination Certificate

active

07834529

ABSTRACT:
A spark plug comprising a housing, a ceramic insulator and a sleeve is provided. The housing has an inner cavity while the ceramic insulator encloses a central electrode. The ceramic insulator is disposed inside the inner cavity and maintain from the housing with a gap. The sleeve is provided enclosing an inner wall of the housing and corresponds to an opening of the inner cavity. The level of an edge surface of the housing corresponding to the opening of the inner cavity is disposed higher than the level of an edge surface of the central electrode, and the level of the center electrode is also higher than the level of the edge surface of the ceramic insulator.

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