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:
Sep. 17, 2002
Filed:
Feb. 07, 2001
Applicant:
Inventors:
Udo Hauptmann, Landsberg/Lech, DE;
Josef Starkmann, Hurlach, DE;
Karl-Heinz Hofmann, Weil, DE;
Tim Pröls, Munich, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 1/044 ;
U.S. Cl.
CPC ...
E21B 1/044 ;
Abstract
A drill including a body having mortises ( ), and a solid hard metal head ( ) having a plurality of bits ( ) and secured to the drill body over the end surface ( ) of the head ( ) and additionally secured to the drill body over portions of side surfaces ( ) of the bits, which are located in a radially outer region of the head ( ), with the side surfaces ( ) extending into mortises and including first surfaces, which are associated with at least some of the bits ( ) and are subjected to pressure acting in a rotational direction of the drill during operation of the drill.