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:
Dec. 15, 1981
Filed:
Apr. 28, 1980
Robert L Smith, Louisville, KY (US);
Chemetron Process Equipment, Inc., Jeffersontown, KY (US);
Abstract
A shaft seal assembly with open mode capabilities has markedly simplified construction. A shiftable ring on the shaft is axially biased against a complemental, stationary shoulder circumscribing the shaft to form a pair of radially spaced annular seals concentric to the shaft. A fluid pressure port on the shoulder intermediate the seals permits selective shifting of the ring away from the shoulder to open the annular seals and place the seal assembly in the open mode wherein the shaft may be rotated without wearing the seals. In preferred forms, the seal assembly is provided with a vent between it and the shaft bearing to relieve pressure against the bearing when the seal assembly is shifted to the open mode, and also to serve as a leak indicator.