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:
Jul. 09, 2002
Filed:
Apr. 19, 1999
Günter Pöschl, Schwaikheim, DE;
Kurt Stoll, Esslingen, DE;
Festo AG & Co., Esslingen, DE;
Abstract
The description relates to an actuator for use at high and low temperatures, with a cylinder block ( ), a piston ( ) movable therein and a piston rod ( ) secured to the piston. A first and a second flange cover ( ) and a sleeve ( ) in the cylinder block ( ) in which the piston ( ) can move to and fro are made of ceramic. The piston rod ( ) is secured to the piston ( ), also of ceramic, by a head bearing ( ) movable transversely to the longitudinal axis of the piston. The seal between the piston ( ) and the sleeve ( ) is provided solely by a close fit, without the need for additional sealing components. The low thermal expansion of the ceramic components used also means that the tolerances change little even at great temperature fluctuations. The radial head bearing ( ) prevents the piston ( ) from jamming during forces transverse to the longitudinal axis of the piston possibly arising at the piston rod ( ).