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:
Nov. 25, 2014
Filed:
Feb. 21, 2012
Yoshihiro Nakamura, Komaki, JP;
Shunsuke Maeda, Toyota, JP;
Masayoshi Matsui, Ichinomiya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A seal member () has a dual-tube structure consisting of an outer tubular seal member () and an inner tubular seal member (); the outer tubular seal member () is welded, at its rear end portion, to the inner circumferential surface of a forward-end housing (), thereby forming a housing-side joint W; the inner tubular seal member () is welded, at its forward end portion, to a forward end portion of the outer tubular seal member (), thereby forming an inter-tubular-seal-member joint W; and the inner tubular seal member () is welded, at its portion located rearward of the joint W, to the outer circumferential surface of the heater (), thereby forming a heater-side joint W. An action of pressing the heater forward is effected on the basis of an axial dimension Lbetween the joints Wand Wshorter than an axial dimension between the joints Wand Wand is, therefore, mitigated.