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:
Aug. 18, 2009
Filed:
Aug. 26, 2003
Jacek Kruszynski, Stuttgart, DE;
Helmut Morlok, Loechgau, DE;
Henry Schuett, Sachsenheim, DE;
Peter Leuze, Walheim, DE;
Jacek Kruszynski, Stuttgart, DE;
Helmut Morlok, Loechgau, DE;
Henry Schuett, Sachsenheim, DE;
Peter Leuze, Walheim, DE;
Komet Group Holding GmbH, Besigheim, DE;
Abstract
The invention relates to a dual-cutting drilling tool. The drilling tool comprises a base body () which is rotatable about a drill axis () and in which two plate seats () are arranged on the front face thereof for receiving identically configured alternating cutting plates (). The alternative cutting plates are respectively provided on a main cutting edge () thereof with an adjacent first face (), forming a cutting wedge, and a free surface (). The main cutting edges () of the alternating cutting plates () complement each other in the region of a central, offset cutting part ('), forming a cross-cutting edge which is interrupted by a center hole (). The aim of the Invention is to reduce the risk of breakage in the center area of the alternating cutting plates and to provide better guidance for the tool. According to the invention, slanting guiding inclinations () are provided on the free surface of the alternating cutting places (), extending from an apex line () to the center corner () of the plates. The free surfaces () are positively inclined in a radially outer region in the direction of advancement and are negatively inclined in the region of the guiding inclinations () thereof.