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:
May. 18, 1993
Filed:
Nov. 21, 1991
Applicant:
Inventor:
Hisakazu Muta, Kanagawa, JP;
Assignee:
Atsugi Unisia Corp., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
92208 ; 92172 ; 277136 ; 1231936 ;
Abstract
In a piston, a circumferential groove for a piston ring, a knock pin being inserted in a bore set radially relative to the piston ring groove. A head end of the knock pin protrudes into a space defined by the piston ring groove for interposing between ends of a piston ring for preventing turning, or rotation, thereof. Means for preventing mechanical interference between the walls of the piston ring groove and the head end of the knock pin is provided.