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:
Jan. 24, 2006
Filed:
May. 16, 2002
Bernhard Borschert, Bamberg, DE;
Dieter Mühlfriedel, Ebermannstadt, DE;
Bernhard Borschert, Bamberg, DE;
Dieter Mühlfriedel, Ebermannstadt, DE;
Kennametal Inc., LaTrobe, PA (US);
Abstract
The invention relates to a drill bit (), having main cutting edges () which are connected together by a transversal cutting edge (). An open surface () which extends into a flute () lies adjacent to each main cutting edge. The drill bit () is ground, in particular, during a continuous three-dimensional grinding process in such a way that the open surface () forms a continuous curved surface which follows a radius of curvature (R) running from the main cutting edge () in the direction of the flute (). The continuous grinding process, in comparison to a conventional two-stage process, produces an improved drill bit geometry which is devoid of ridges (). The ridge-free configuration reduces the mechanical stress during drilling to a minimum.