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. 24, 2012
Filed:
Dec. 17, 2009
Christoph Wetter, Feldkirch, AT;
Roland Foser, Schaan, LI;
Jens Schneider, Feldkirch, AT;
Markus Meierhofer, Grabs, CH;
Christoph Wetter, Feldkirch, AT;
Roland Foser, Schaan, LI;
Jens Schneider, Feldkirch, AT;
Markus Meierhofer, Grabs, CH;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A drill head extending along a drill axis made of hard metal for rock drills is disclosed. The drill head features at least one major cutting edge and at least one minor cutting edge, where the major cutting edge extends from a first radially inner end to a first radial outer end which lies on a first diameter and where the minor cutting edge extends from a second radially inner end to a second radially outer end which lies on a second diameter that is smaller than the first diameter. A first enveloping surface defined by the minor cutting edge projects completely axially over a second enveloping surface defined by the major cutting edge.