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. 11, 2007
Filed:
Feb. 19, 2004
Applicant:
Miyuki Usui, Kashiwazaki, JP;
Inventor:
Miyuki Usui, Kashiwazaki, JP;
Assignee:
Kabushiki Kaisha Riken, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J 9/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil ring body thus making the mounting operation cumbersome. To overcome such a drawback, a relationship L<Lis established. Here Lmeans a axial distance between open peripheries of the groove portion and Lmeans a maximum axial distance between peripheries of the groove portion.