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:
May. 27, 1980
Filed:
May. 01, 1978
Inge Johansson, Taby, SE;
Defibrator Aktiebolag, Stockholm, SE;
Abstract
A sealing device is provided for shafts passing through the wall of a housing containing a pressurized medium of a pressure differing from that of the environment external to the housing. The sealing device includes at least one ring of packing or sealing material formed in at least one annular layer around the outer surface of the shaft. A nonrigid sleeve is mounted around the outer surface of the ring of packing material. The sealing device further includes a duct for providing a source of pressurized medium to the outer surface of the nonrigid sleeve. The forces exerted by the pressurized medium on the outer surface of the sleeve are transmitted to the layer of packing material enclosed within the sleeve so that the packing material is maintained pressed in a close sealing relationship with the outer surface of the shaft.