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:
Oct. 15, 1996
Filed:
Feb. 15, 1995
Keith E Lawrence, Peoria, IL (US);
Tsu P Shyu, Dunlap, IL (US);
Donald J Waldman, Brimfield, IL (US);
Ross P Wietharn, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An oil control ring assembly having a sealing ring and a scraping is disposed within a groove in a piston. The scraping ring assembly has a scraping end portion and spaced apart ends defining a gap. The sealing ring has a sealing end portion and mated spaced apart radially stepped ends defining a stepped gap. The stepped gap on the sealing ring is offset from the gap on the scraping ring. A spring positioned between an inner wall of the groove and the scraping ring biases the scraping ring at a specified tension. An alignment wire maintains misalignment between the stepped gap and the gap.