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, 1997
Filed:
Oct. 28, 1994
Horst Oppitz, Dittelbrunn, DE;
Bernhard Schmitt, Wasserlosen, DE;
Fichtel & Sachs AG, Schweinfurt, DE;
Abstract
A rotary actuator having a cylinder and a motor shaft as well as end caps which define a working area, a number of ribs on the inside surface of the cylinder and an equal number of vanes on the motor shaft which divide the working area into work chambers, and seals inside grooves in the ribs and the vanes. The work chambers are alternately supplied with hydraulic medium, and the seals hydraulically separate the working chambers from one another. The seals are in the form of one-piece gasket members and there is a space between the seals and the side walls of the groove in the static rest position. The gasket member, via its end surfaces, its surfaces which define the height of the gasket member, and one side wall, perform a sealing function during operation of the rotary actuator.