Spark plug

Details Spark plug Spark plug

2007-02-13

2007-02-13

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000

Reexamination Certificate

active

10964696

ABSTRACT:
A spark plug is disclosed as including a metal shell10formed with first and second bores10c,10dand a stepped section10ebetween the first and second bores, and a porcelain insulator20having a largest-diameter section20d, which is accommodated in the first bore and a small-diameter section20eaccommodated in the second bore. The first and second bores of the metal shell have a dimensional relationship, lying in a value equal to or less than 1.8 mm, which is expressed as (D1−D2)/2 where D1represents an inner diameter of the first bore of the metal shell and D2represents an inner diameter of the second bore of the metal shell.

REFERENCES:
patent: 1139529 (2001-10-01), None
patent: 1168547 (2002-01-01), None
patent: 5-55490 (1993-07-01), None

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