Patent · US Expired

Twist drill

US7101125B2 · kind B2 · utility

20Cited by

27References

20Claims

0Family size

Assignee

KENNAMETAL INC. · US

Inventors

Bernhard Borschert · Bamberg, DE
Jerome C. Hanna · Greensburg, US
Tilo Krieg · Bad Mergentheim, DE
Larry R. Meenan · Greensburg, US
Michael D. Shultz · Derry, US

Key dates

Filing date	Dec 17, 2003
Grant date	Sep 5, 2006
Priority date	—
Expiry date	Dec 26, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/9097
WIPO fieldMachine tools
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.