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:
Aug. 27, 1991
Filed:
Nov. 15, 1989
Applicant:
Inventor:
Sumio Ono, Kashiwazaki, JP;
Assignee:
Kabushiki Kaisha Riken, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277139 ; 277141 ;
Abstract
A combined oil ring assembly including an expander and a pair of side rails. The expander is formed in the shape of a plurality of corrugations having a plurality of oil releasing bores and cut-out portions. The circumferential lengths of the oil releasing bores in the expander that are located at least between the opposed ends of the expander and the ear portions nearest to the opposed ends as well as between the nearest ear portions and the next ear portions are shorter than that of the other oil releasing bores.