Spark plug having center electrode with columnar portion and...

Details Spark plug having center electrode with columnar portion and... Spark plug having center electrode with columnar portion and...

2006-09-19

2006-09-19

Guharay, K (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C313S144000, C123S14500A, C123S14500A

Reexamination Certificate

active

07109646

ABSTRACT:
A spark plug is composed of a main metal fitting having a cylindrical structure, an insulator disposed inside the cylindrical main metal fitting, a center electrode fitted in the insulator in a manner that a front end portion of the center electrode projects outward over one end of the insulator, and a grounding electrode mounted to the main metal fitting and having one end portion opposing to the front end portion of the center electrode through a discharge gap therebetween. The front end portion of the center electrode includes a conical portion having a tapered surface having a taper angle of less than 80°, and a columnar portion formed to a top end portion of the conical portion so as to have a diameter in a range of 0.4 mm to 0.8 mm.

REFERENCES:
patent: 5866972 (1999-02-01), Matsubara et al.
patent: 5877584 (1999-03-01), Kato et al.
patent: 6215235 (2001-04-01), Osamura
patent: 6597089 (2003-07-01), Matsutani
patent: 6762539 (2004-07-01), Klett et al.
patent: 2001/0029916 (2001-10-01), Kanao
patent: 1497641 (1976-05-01), None
patent: 51-140034 (1976-12-01), None
patent: 1-109675 (1989-04-01), None
patent: 9-260017 (1997-10-01), None
patent: 2001-345162 (2001-12-01), None

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