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:
Jul. 08, 1980
Filed:
Mar. 01, 1978
Applicant:
Inventor:
Pierre H Burnier, Longjumeau, FR;
Assignee:
BBC Brown Boveri & Cie., Baden, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F17C / ;
U.S. Cl.
CPC ...
62 555 ; 62268 ; 6251 / ;
Abstract
A device for maintaining a vacuum in a compartment of a rotating member includes a collector which is mounted over an orifice of the rotating member. The collector has an end wall with an annular aperture extending axially of the rotating member. The aperture is selectively sealed by an annular valve member which permits communication of the compartment with a high-vacuum pump. The valve member may be of a magnetizable material and may be moved axially by a fixed control coil. Sealing members are provided for sealing the compartment of the rotating member with respect to a fixed member when the compartment is in communication with the vacuum pump.