Electric lamp and discharge devices – Spark plugs – Shaped electrode chamber – insulator end – shell skirt – baffle...
Reexamination Certificate
2008-03-07
2010-11-02
Patel, Ashok (Department: 2889)
Electric lamp and discharge devices
Spark plugs
Shaped electrode chamber, insulator end, shell skirt, baffle...
C313S135000, C313S145000
Reexamination Certificate
active
07825573
ABSTRACT:
A spark plug assembly (10) for engine applications where the combustion chamber is difficult to access when servicing or replacing a spark plug. The spark plug assembly (10) includes a fairly traditional spark plug component (28) to which an elongated tubular conduit (12) is attached, such as by welding, to a portion of the metallic shell (32). The conduit (12) contains an upper ceramic insulator (52) adjacent its top end (14) disposed in end-to-end abutting contact with an outer elastomeric insulator (58). The ceramic insulator of the spark plug component (28), herein referred to as a lower ceramic insulator (30), is surrounded by the outer elastomeric insulator (58) and held securely within the conduit (12) thereby. An inner elastomeric insulator (62) is disposed in a continuous passageway formed between aligned central bores formed in the respective upper ceramic (52) and outer elastomeric (58) insulators. The inner elastomeric insulator (62) supports and further electrically isolates an elongated electrically conductive center electrode extension (48) that is in direct electrical conductivity with the center electrode (44) of the spark plug component (28). An ignition lead wire makes electrical contact with the center electrode extension (48) and thereby delivers electrical energy at timed intervals to the spark gap.
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Callahan Richard E.
Freeman Robert D.
Dickinson Wright PLLC
Federal-Mogul Ignition Company
Patel Ashok
Stearns Roberts L.
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