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. 18, 1994
Filed:
Dec. 02, 1992
Brian Simmons, San Ramon, CA (US);
Michael S Rivkin, San Leandro, CA (US);
Arnold Kholodenko, San Francisco, CA (US);
Rotoflex, Inc., Pleasanton, CA (US);
Abstract
A seal for preventing leakage around a rotary shaft extending through a structural casing comprising an annular stationary rigid seal secured to the structural casing for surrounding the rotary shaft. The stationary rigid seal has a smooth sealing surface for establishing a seal, and a resilient rotary seal adapted to be secured to the rotary shaft and having an annular projecting edge for contacting the smooth sealing surface under a biased pressure to form a seal in conjunction therewith. The projecting edge is formed by the convergence of inner and outer forward surfaces. A radial surface extends to the inner concentric forward surface from a torque point at its forward cylindrical base. An outer rearward surface extends to the outer concentric forward surface from a pivot point at its rearward cylindrical base. The outer forward surface forms an angle with the central axis of the seal in a plane through the central axis of the seal of from 40.degree. to 60.degree.. The inner concentric forward surface and the outer rearward surface forms angles with the central axis of the seal in a plane through the central axis of the seal which are individually within the range of from 45.degree. to 60.degree.. A line extending in a plane through the central axis of the seal from the pivot point to the projecting edge is within the range of from 16.degree. to 21.degree..