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:
Dec. 02, 2003
Filed:
Oct. 25, 2001
Applicant:
Inventors:
Werner Kleine, Achim, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 1/044 ;
U.S. Cl.
CPC ...
E21B 1/044 ;
Abstract
A helical drill bit ( ) for rock has an axially extending shank ( ) located between a chuck insert end ( ) and an opposite drilling head ( ) with at least one axially extending helical discharge groove ( ) extending radially inwardly from the outer circumferential surface of the shank. A radially projecting groove reinforcement ( ) is arranged in the base of the radial groove ( ), with the reinforcement changing its geometric form or its position within the discharge groove ( ) along the discharge groove ( ).