Spark plug including electrode with protruding portion for holdi

Details Spark plug including electrode with protruding portion for holdi Spark plug including electrode with protruding portion for holdi

1996-10-10

1998-09-22

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313140, 313141, 445 7, H01T 1320, H01T 2102

Patent

active

058119159

ABSTRACT:
Center and earth electrodes are melted at the predetermined regions on the tip thereof where noble metallic chips are fixed. Then, the noble metallic chips are sunk in the melted portions of these center and earth electrodes so as to form protruding portions along outer peripheries of the noble metallic chips. Thus, the noble metallic chips are fixed to the electrodes through the protruding portions. Next, the noble metallic chips are irradiated by energy-condensing light through the protruding portions thus formed. With this irradiation, the center electrode is welded to one noble metallic chip, while the earth electrode is welded to the other noble metallic chip.

REFERENCES:
patent: 4853582 (1989-08-01), Sato et al.
patent: 5488262 (1996-01-01), Takamura

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