Electric lamp and discharge devices – Spark plugs – Shaped electrode chamber – insulator end – shell skirt – baffle...
Patent
1989-04-24
1990-12-25
O'Shea, Sandra L.
Electric lamp and discharge devices
Spark plugs
Shaped electrode chamber, insulator end, shell skirt, baffle...
313141, H01T 1320
Patent
active
049806017
ABSTRACT:
An igniter plug is provided with a metallic shell, an insulator located within the metallic shell and a center electrode within the inner bore of the insulator. The front end of the electrode extends outside beyond the front end of the insulator. The insulator is made from sintered ceramic material which includes silicon nitride in an amount in the range 85-99% by weight. The front end of the insulator is axially retracted interiorally from the front end of the metallic shell from about 1.5 to about 2.5 mm.
REFERENCES:
patent: 2183696 (1939-12-01), Rohde
patent: 2406172 (1946-08-01), Smithells
patent: 4695758 (1987-09-01), Nishida et al.
Aoki Noboru
Suzuki Takahiro
NGK Spark Plug Co. Ltd.
O'Shea Sandra L.
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