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:
Mar. 10, 2009
Filed:
May. 04, 2007
Bernhard Litscher, Buchs, CH;
Thomas Blecha, Feldkirch, AT;
Bernhard Litscher, Buchs, CH;
Thomas Blecha, Feldkirch, AT;
Vat Holding AG, Seelistrasse, CH;
Abstract
A vacuum valve drive for linear displacement of a valve closure along an adjustment axis between an opened and closed position, and a vacuum valve comprising the vacuum valve drive, are provided. The vacuum valve drive comprises a drive housing containing a gas tight working space, a piston inside the working space, and at least one connecting rod which is led from the working space in a gas-tight manner to the valve closure. A static guide rod extends centrally and parallel to the adjustment axis inside the working space and is led through the piston. A precision linear bearing is between the piston and the guide rod. The piston is linearly guided by the guide rod with high precision and centered in the working space so that the valve closure is moved with high precision and pressed onto the valve seat.