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. 13, 1978
Filed:
Jul. 14, 1976
Applicant:
Inventor:
Anthony Charles Back, Slough, EN;
Assignee:
Crane Packing Limited, Slough, EN;
Primary Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277 27 ;
Abstract
A rotary mechanical seal assembly for a shaft comprises a freely floating ring of flexible material which has inner and outer axially directed lips to bear against the surfaces of the shaft and housing, at least one of these lips being normally out of contact with its associated surface so that no wear takes place. The seal is brought into action by the application of pressure either applied from an outside source or created by leakage past an adjacent upstream face-type seal for which the seal of the invention forms an emergency back-up. There may be a detector to sense the leakage. There could be two such lip seals facing one another.