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. 13, 1986
Filed:
Oct. 01, 1985
Hanns-Peter Berges, Cologne, DE;
Wolfgang Leier, Bergisch Gladbach, DE;
Leybold-Heraeus GmbH, Cologne, DE;
Abstract
An oil-sealed vacuum pump has an oil circuit which has an externally located oil filter that may be operatively connected to or disconnected from the oil circuit by a coupler. The coupler has a rotatably supported valve disc having a first face oriented towards oil circuit ports in the pump and a second face oriented towards the filter. The valve disc further has spaced first and second apertures passing therethrough and a groove provided in the first face and oriented approximately perpendicularly to an imaginary line connecting the first and second apertures with one another. A valve actuating mechanism is provided for rotating the valve disc into a first position in which the first and second apertures are in registry with the circuit ports to maintain communication between the filter and the oil circuit and for rotating the valve disc into a second position in which the first and second apertures are out of registry with the circuit ports to block communication between the filter and the oil circuit and in which the groove is in registry with the circuit ports to maintain a direct communication therebetween to thus short-circuit the oil circuit.