The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 2006
Filed:
Jun. 24, 2003
Shigeo Fujita, Nagoya, JP;
Shinichiro Mitsumatsu, Nagoya, JP;
Shigeo Fujita, Nagoya, JP;
Shinichiro Mitsumatsu, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
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 gand measuring a difference (ggt) between the measured spark gap gand the final target gap gt, and pressing the ground electrode toward the center electrode when the difference (ggt) is positive. An apparatus for carrying out the method is also provided.