Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1994-03-17
1996-10-08
O'Shea, Sandra L.
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313144, H01T 1320
Patent
active
055634680
ABSTRACT:
Method of producing a spark plug having a center electrode 1 provided with precious metal chips 31 and 32 on the tip 10. Production of the center electrode 1 is composed of a flat area formation process wherein a cylindrical center electrode 1 is formed by extrusion of metal material and wherein flat areas 111 and 113 are formed on the sides of the tip 10 of the same, a tip bonding process wherein precious metal chips 31 and 32 are bonded to the flat areas, and a plastic machining process wherein the tip 10 whereupon the precious metal chips are bonded is formed into an abbreviated cylinder by means of plastic machining. By applying an identification mark to the tip surface of the tip 10, the precious metal chips 31 and 32 can accurately and easily be arranged opposite the ground electrodes when mounting the center electrode in a metal housing.
REFERENCES:
patent: 2251179 (1941-07-01), Weinerth
patent: 2630107 (1953-03-01), Field
patent: 3958144 (1976-05-01), Franks
patent: 4743793 (1988-05-01), Toya et al.
patent: 4893051 (1990-01-01), Kondo
patent: 4904216 (1990-02-01), Kagawa et al.
patent: 4970426 (1990-11-01), Bronchart
Abe Nobuo
Katoh Akio
Nippondenso Co. Ltd.
O'Shea Sandra L.
Patel Vip
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