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:
Jun. 23, 1981
Filed:
Jan. 29, 1979
Steffen Wunsch, Dettenhausen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In order to improve the holding power of a tool chuck, especially a tool chuck for use with percussion or impact drills, without the use of elastic friction elements that impede intentional opening and closing, the invention describes a tool chuck in which cooperating, preferably conical surfaces disposed respectively, on the stationary collet and the rotating structure of the chuck engage one another when the chuck is closed and clamps the inserted tool. Additional relative rotation imparted to the rotating structure with respect to the collet causes clamping forces to be applied to the inserted tool and further causes the cooperating conical surfaces to be pressed against one another, thereby generating high surface pressures which oppose the unintentional opening of the chuck even during the presence of axial percussion shocks.