Method of making metallic shell for spark plug, method of...

Details Method of making metallic shell for spark plug, method of... Method of making metallic shell for spark plug, method of...

2007-02-06

2007-02-06

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C313S118000, C072S356000, C123S1690EB

Reexamination Certificate

active

10759281

ABSTRACT:
A method of making a metallic shell for a spark plug. The metallic shell includes a multi-stepped through hole, an intermediate tubular portion, a tip end side tubular portion and a base end side tubular portion. The through hole includes a large diameter hole section, an intermediate diameter hole section and a small diameter hole section. The method includes the steps of cutting a metal pipe that is used as a starting material to a predetermined length and thereby preparing a pipe-shaped blank, and subjecting the blank to a deformation process and thereby forming the blank into the metallic shell. A spark plug and a method of making the same are also disclosed.

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Computer translation of Kiyoshi taken from http://www19.ipdl.ncipi.go.jp/PA1/cgi-bin/PA1DETAIL on Apr. 28, 2006.
European Search Report for EP 04 25 0241 dated Apr. 22, 2004.

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