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. 09, 2016
Filed:
Oct. 10, 2012
Applicant:
Kabushiki Kaisha Riken, Tokyo, JP;
Inventors:
Masahiro Nakazawa, Kashiwazaki, JP;
Tadahiko Watanabe, Kashiwazaki, JP;
Satoshi Koizumi, Kashiwazaki, JP;
Assignee:
KABUSHIKI KAISHA RIKEN, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J 9/00 (2006.01); F16J 9/12 (2006.01); F16J 9/06 (2006.01);
U.S. Cl.
CPC ...
F16J 9/12 (2013.01); F16J 9/068 (2013.01);
Abstract
To provide a combined oil control ring with a function of preventing the separate rotation of side rails for a long period of time even under fretting fatigue, seating tabs of a spacer expander are provided with substantially longitudinal projections and recesses on their side-rail-pushing surfaces in a circumferential direction, the width m of a bottom surface being larger than the circumferential length m' of the top surface in each projection, and a surface connecting the top surface to a recess surface having a bulging shape.