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:
Jan. 21, 1986
Filed:
Apr. 29, 1985
Applicant:
Inventors:
Ernst Brennsteiner, Munich, DE;
Dieter Scholz, Unterpfaffenhofen, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan Furstentum, LI;
Primary Examiner:
Int. Cl.
CPC ...
B23B / ; B23B / ; E21B / ;
U.S. Cl.
CPC ...
408226 ; 175414 ; 279 19 ; 279 195 ;
Abstract
A drill is secured in percussion drilling machines and in tool holders of hammer drills by locking elements. The locking elements fit into axially extending grooves formed in the axially extending circumferential surface of the shank of the drill. Webs located intermediate the ends of the grooves divide the grooves into axially extending groove sections with the locking elements fitting into the groove sections. The outer surfaces of the webs are located in the circumferential surface of the shank and serve to support the jaws of the tool holder in the correct position.