Spark plug

Details Spark plug Spark plug

2006-06-06

2006-06-06

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000

Reexamination Certificate

active

07057332

ABSTRACT:
A spark plug (30; 40) comprises an electrically-insulating sleeve (12), a first electrode (16), an electrically-conducting shell (20) surrounding said sleeve, and a second electrode (22) mounted on said shell. The electrodes (16and22) define a spark gap (G1) of the plug. The shell (20) has an end portion (20c) terminating at an end surface (20b) of the shell. The sleeve (12) extends past said end portion (20c) with a clearance therebetween and extends beyond said end surface (20b). The sleeve (12) has at least one projection (32) which projects from the sleeve (12) and reduces said clearance in the region of the end surface (20b), thereby forming a secondary spark gap (G2).

REFERENCES:
patent: 4211952 (1980-07-01), Iwata et al.
patent: 4289990 (1981-09-01), Mayumi et al.
patent: 100 15 916 (2001-10-01), None
patent: 759 221 (1934-01-01), None
patent: 188 874 (1922-11-01), None
patent: 9-139276 (1995-05-01), None

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