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:
Apr. 07, 1992
Filed:
Sep. 14, 1990
Gerhard Grund, Dusseldorf, DE;
Rainer Kempken, Erkrath, DE;
Paul Forkardt GmbH & Co. KG, Dusseldorf, DE;
Abstract
A chuck for clamping workpieces or tools is provided. The chuck has a chuck body and at least two clamping jaws are radially displaceably guided in the chuck body and are operable, via wedge surfaces, by a driven chuck piston that is axially displaceable. The chuck piston is in the form of a closed, first annular piston having an outer surface that is guided all the way around in a bore of the chuck body, with a forward region of the outer piston surface being provided with tangentially extending wedge surface, the number of which corresponds to the number of clamping jaws, with these wedge surfaces cooperating with correspondingly shaped counter-surfaces of the clamping jaws. A second annular piston, which operates in an opposite direction, is disposed in the chuck body concentric to the first annular piston. The second annular piston is also provided with tangentially extending wedge surfaces that cooperate with corresponding counter-surfaces of the clamping jaws.