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:
May. 27, 2003
Filed:
Aug. 21, 2001
Jon J. Radosav, Norridge, IL (US);
John Crane Inc., Morton Grove, IL (US);
Abstract
A mechanical end face seal comprising two relatively rotatable seal rings, a resilient bellows for providing a secondary seal between one seal ring and either a housing or a rotating shaft and a finger spring element nested in the bellows. The resilient bellows comprises an elastomeric material, such as molded rubber, and has a single convolution having a general cross-sectional shape of an inverted “Omega.” The finger spring member comprises a plurality of generally “U” shaped spring fingers which provide the axial biasing force to urge the ring faces in sealing relation. In a preferred embodiment, the spring includes ferrules for providing radially inward force on a flange portion of each end of the bellows to maintain the secondary seal.