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:
Jan. 08, 2019
Filed:
Mar. 28, 2016
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Takayuki Ito, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
A method for manufacturing a spark plug including a center electrode that extends in an axial direction, a metal shell that is provided around an outer periphery of the center electrode, and a rod-shaped ground electrode whose base end is joined to the metal shell and whose distal end is bent towards an axial-line side. The method comprises a bending step of bending an unbent ground electrode, which is the ground electrode that is not yet bent, by pressing against it a predetermined curved surface of a bend spacer, wherein the bend spacer is formed so as to be divisible into two or more members including a first member and a second member. The first member includes a mounting portion for mounting the bend spacer on a fixing tool and the second member includes the predetermined curved surface that comes into contact with the unbent ground electrode.