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:
Jul. 24, 1990
Filed:
Aug. 09, 1988
Applicant:
Inventors:
Tooru Matsuura, Nagoya City, JP;
Yoshinori Narita, Nagoya City, JP;
Assignee:
NGK Spark Plug Co., Ltd., Nagova City, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
92212 ; 92222 ; 1231 / ; 123270 ; 123279 ;
Abstract
A piston head has a cavity and a central projection projecting into the cavity. A ceramic insert is cast in a piston body so as to cover a piston head portion defining the cavity except the central projection-and-its adjacent piston head portion. The ceramic insert has an edge defining a hole through which the central projection projects into the ceramic insert. In one form of the embodiment, a clearance is provided between the edge of the ceramic insert and the central projection-and-its adjacent piston head portion.