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, 1977
Filed:
Mar. 04, 1976
Harold E McCormick, Ballwin, MO (US);
Ramsey Corporation, St. Louis, MO (US);
Abstract
A low friction piston ring of split annular construction has a circumferentially extending recess formed at its upper outer portion to define an outer radial ledge which divides the outer axial surface of the ring into a recessed outer face and a reduced (as compared to the total outer axial surface) bearing surface. The bearing surface preferably has a wear resistant coating thereon. The outside diameter of the recessed outer face is less than the outside diameter of the bearing surface by an amount at least equal to the radial wear depth of the bearing surface. A peripheral recess is also formed at the upper-inner portion of the ring to reduce or eliminate torsional twisting of the ring. The ring provides a reduction in frictional resistance between the ring and the cylinder wall, good sealing against gas blow-by and enhanced engine performance and exhaust emissions control.