Method and apparatus for making a spark plug with a...

Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making

Reexamination Certificate

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Reexamination Certificate

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07112112

ABSTRACT:
A method for making a spark plug is provided. The method comprises the steps of, for adjustment of a spark gap, provisionally pressing a ground electrode toward a leading end surface of a center electrode and thereby decreasing the spark gap to a predetermined value larger than a final target gap gt, after the step of provisionally pressing the ground electrode, performing an adjustment bending process for eliminating an eccentricity δ of the ground electrode in the widthwise direction thereof with respect to a target position, after the step of performing the adjustment bending process, measuring a spark gap g1and measuring a difference (g1−gt) between the measured spark gap g1and the final target gap gt, and pressing the ground electrode toward the center electrode when the difference (g1−gt) is positive. An apparatus for carrying out the method is also provided.

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patent: 6193575 (2001-02-01), Nakatani
patent: 6592418 (2003-07-01), Ito et al.
patent: 6893310 (2005-05-01), Nakatani
patent: 3-64882 (1991-03-01), None
patent: 8-153566 (1996-06-01), None
patent: 11-121143 (1999-04-01), None
patent: 2000-164320 (2000-06-01), None
patent: 2000-164322 (2000-06-01), None
patent: 2000-164322 (2000-06-01), None
patent: 2000-182749 (2000-06-01), None
patent: WO 01-93389 (2001-12-01), None

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