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:
Apr. 19, 1994
Filed:
Jul. 09, 1992
Applicant:
Inventor:
David J Larkins, Brampton, CA;
Assignee:
Robbins & Myers, Inc., Dayton, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277-9 ; 277-95 ; 277 38 ;
Abstract
A shut-off seal for a rotatable shaft penetrating a fluid-holding tank through an opening below the fluid surface. The shut-off seal has a collar secured to the shaft inside the tank and a positionable annular shut-off ring which may be moved into engagement with the collar. The invention enables leakage-free shutdown for servicing an associated rotary seal without moving the rotary seal axially along the shaft.