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. 05, 2006
Filed:
Dec. 17, 2003
Bernhard W. Borschert, Bamberg, DE;
Jerome C. Hanna, Greensburg, PA (US);
Tilo Krieg, Fürth, DE;
Larry R. Meenan, Greensburg, PA (US);
Michael D. Shultz, Derry, PA (US);
Bernhard W. Borschert, Bamberg, DE;
Jerome C. Hanna, Greensburg, PA (US);
Tilo Krieg, Fürth, DE;
Larry R. Meenan, Greensburg, PA (US);
Michael D. Shultz, Derry, PA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A twist drill including a cutting tip having a front flank face, a substantially cylindrical tool body extending rearwardly from the cutting tip, and a shank. The tool body includes a rotational axis therethrough and at least one flute formed on an outer peripheral surface thereof and extending to the front flank face. The at least one flute includes a first helical portion opening to the front flank face and a second helical portion extending from the rear end of the first helical portion toward the rear portion of the tool body. The second helical portion twists in a direction opposite of the first helical portion.