Spark plug

Details Spark plug Spark plug

1992-01-24

1993-11-23

Demeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Ring or disk electrode

313140, 313142, H01T 1332, H01T 1346

Patent

active

052647544

ABSTRACT:
Disclosed is a spark plug for an internal combustion engine including an annular end portion with a central electrode having an end within the annular end portion. A ground electrode extends from the annular end portion and has a portion extending over and spaced a predetermined distance above the end of the central electrode. The improvement comprises the end of the central electrode having cross-grooves therein defining four end faces and the ground electrode having diverging prongs at its end over the central electrode, a portion of each prong being over two adjacent end faces of the central electrode. Improved ignition is provided without critical manufacturing problems of prior art spark plugs.

REFERENCES:
patent: 4268774 (1981-05-01), Forkum, Jr.
patent: 4288714 (1981-09-01), Yamada
patent: 4329615 (1982-05-01), Tanaka et al.
patent: 4336477 (1982-06-01), Yamada
patent: 4910428 (1990-03-01), Strumbos
patent: 4916354 (1990-04-01), Forkum, Jr.

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