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:
Sep. 23, 1986
Filed:
Jun. 20, 1984
Burton K Olsson, Park Ridge, IL (US);
Chicago Rawhide Manufacturing Co., Elgin, IL (US);
Abstract
The present invention is directed to a grit exclusion and oil retention seal for use in extremely hostile environments. These environments include, but are not limited to sealing oil within cavities forming parts of earth drilling bits and the like. Seals such as these, include the ability to seal oil within a cavity in a reliable manner even under extreme conditions of vibration, mechanical shock, and the presence of grit, sand, water, dirt and mixtures thereof. In order to function properly in this environment, the seal must also provide a certain amount of axial end play so that relative movement of the sealed parts will not permit the seal to leak. In this connection, a heavy duty seal of the type with which the invention is concerned must provide not only a primary or relatively moveable seal, but also a secondary seal. The seal assembly must include means for transmitting torque from the housing or carrier to the primary seal rings. Means must be present for applying and maintaining an axial end face load of the proper range.