Spark plug manufacturing apparatus and method of...

Details Spark plug manufacturing apparatus and method of... Spark plug manufacturing apparatus and method of...

2007-08-28

2007-08-28

Bruce, David (Department: 2809)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C264S162000, C264S614000, C264S678000

Reexamination Certificate

active

11410947

ABSTRACT:
The spark plug manufacturing apparatus includes a holding plate formed with a plurality of mounting holes penetrating from a front surface to a rear surface thereof for holding therein hollow tubular insulators of spark plugs, each of which is fitted therein with a center electrode and a metal stem provided with a terminal part, and is charged with a powder resistance material between the center electrode and the stem, and an electric furnace for heating the insulators held in the mounting holes of the holding plate. The holding plate is made of a ceramic material containing not less than 50 wt % of silicon nitride.

REFERENCES:
patent: 2004-319335 (2004-11-01), None
patent: 2005-132691 (2005-05-01), None
patent: 200513691 (2005-05-01), None

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