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. 08, 2015
Filed:
Mar. 13, 2013
Applicant:
Westinghouse Electric Company Llc, Cranberry Township, PA (US);
Inventors:
Phillip J. Hawkins, Irwin, PA (US);
Judith E. Hodgson, Irwin, PA (US);
Assignee:
Westinghouse Electric Company LLC, Cranberry Township, PA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J 15/16 (2006.01); F04B 7/00 (2006.01); F04D 29/12 (2006.01); F03G 7/06 (2006.01);
U.S. Cl.
CPC ...
F04B 7/00 (2013.01); F03G 7/06 (2013.01); F04D 29/12 (2013.01); F16J 15/164 (2013.01);
Abstract
A thermal actuator for a rotating shaft shutdown seal that has a piston with a portion of its axial length enclosed within a chamber shell with a material that expands upon a rise in temperature. The portion of the actual length of the piston within the chamber has at least two different diameters with the larger diameter leading in the direction of travel of the piston. Upon a rise in temperature, expansion of the material surrounding the piston within the chamber creates a force on the piston in the desired direction of travel.