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:
Jul. 08, 2003
Filed:
Aug. 28, 2001
Applicant:
Inventor:
Udo Hauptmann, Landsberg/Lech, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 1/036 ;
U.S. Cl.
CPC ...
E21B 1/036 ;
Abstract
A rock drill has at least one hard material insert ( ) with at least two cutting edges ( ) consisting of hard material and extending radially to the drill axis (A), whereby, in a radial range of 20% to 50% of their drilling radius, at least two cutting edges ( ) each have an axial recess ( ), and the cutting edges ( ) rotating around the drill axis (A) extend with their cutting edges in their entirety without any gaps over the entire drilling radius.