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. 12, 1981
Filed:
Aug. 17, 1978
Gunter Wahl, Leinfelden-Echterdingen, DE;
Gerhard Kuhlmann, Stuttgart, DE;
Ernst Kranzler, Leinfelden-Echterdingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A tool chuck, especially for holding tool bits, for example twist drills, and for use with a machine tool, in particular a portable electric drill. The chuck is so constructed as to permit secure holding of the tool bit even when used in percussion drills or impact hammer drills, while at the same time providing protection for the elastic internal element which provides axial movement. The tool chuck has a core or mandrel surrounded by a hollow conical collar which includes at least two chuck jaws and the elastic member is located between the core and the collar to apply an axial force between these two parts when the chuck is closed on a tool bit while being protected against direct exposure to the impacts sustained by the chuck jaws.