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:
Sep. 21, 1993
Filed:
Mar. 17, 1992
Applicant:
Inventor:
Volker Drittel, Renningen, DE;
Assignee:
Hygrama AG, Rotkreuz, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ; F01B / ;
U.S. Cl.
CPC ...
92 88 ; 277D / ;
Abstract
A linear drive apparatus comprises a cylindrical casing having a longitudinal slot. A piston is located in an inner chamber of the apparatus and can be moved in longitudinal direction by differential pressures. This piston includes a projection extending through the longitudinal slot. The outer side and the inner side of the longitudinal slot are sealed off by a sealing strip. An air connector is in communication with the space between the two sealing strips, allowing the production of a vaccum or of an overpressure in the mentioned space.