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:
Jun. 04, 2002
Filed:
Aug. 21, 2000
Jon J. Radosav, Norridge, IL (US);
John Crane Inc., Morton Grove, IL (US);
Abstract
A mechanical face seal comprising two seal rings for use in water pumps and other fluids, including a resilient bellows for providing a secondary seal between one seal ring and either a housing or a rotating shaft extending through an aperture in the housing. The resilient bellows preferably comprises an elastomeric material, such as molded rubber, and has a single convolution having a general cross-sectional shape of an inverted “omega.” A finger spring member comprises a plurality of generally “U” shaped spring fingers which are adapted and deformed upon installation to provide an axial biasing force against the seal ring attached to the resilient bellows so as to urge it toward the other ring. In a preferred embodiment, the resilient bellows includes a ferrule for providing radially inward force on a flange portion of the bellows to maintain the secondary seal between the bellows and the seal ring, and a corresponding second ferrule at a flange portion disposed opposite the axial end of the bellows which provides a secondary seal between the bellows and either the shaft or the housing. Preferably, the seal elements are associated with a shaft sleeve and a retainer to present the seal as a cartridge for easy installation.