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:
Dec. 22, 1981
Filed:
May. 27, 1980
Shoichi Honda, Tokyo, JP;
Yusuke Gotoda, Tokyo, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A piston ring for an oblong piston reciprocating in an oblong cylinder has side portions which merge at one end with a relatively long convex portion. Each side portion also merges with a relatively short convex end portion, respectively. The short convex end portions define a gap between them. Upon installation of the piston ring into a groove on the piston and within the wall of the oblong cylinder, the width of the gap is substantially reduced, thereby to stress the side portions and cause them to reduce pressure variations between the piston ring and the cylinder wall around the periphery of the piston ring. The oblong piston and cylinder may have straight side walls merging with arcuate end walls, or may be substantially elliptical in cross section.