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. 29, 1993
Filed:
Dec. 19, 1991
Applicant:
Inventor:
Michael C Roberts, Bristol, GB;
Assignee:
Rolls-Royce plc, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ;
U.S. Cl.
CPC ...
277-3 ; 277 53 ; 4151745 ;
Abstract
An air seal is disposed between high and low pressure zones and includes an annular static arm and coaxial annular sealing arm which rotates relative to the static arm. The static arm, is scalloped to form a series of cavities and the sealing arm is formed with angled through holes opposite the cavities. A seal is provided between the static arm and the sealing arm. In use, a ram pressure rise is generated in the holes by the rotation of the sealing arm and the pressure rise creates a flow of air which offsets the leakage past the seal.