Patent · US Active

Twist drill

US9539653B2 · kind B2 · utility

7Cited by

5References

15Claims

0Family size

Assignee

WALTER AG · DE

Inventors

Siegfried Rogalla · Gengenbach, DE
Stefan Thoma · Waldkirch, DE

Key dates

Filing date	Dec 5, 2013
Grant date	Jan 10, 2017
Priority date	—
Expiry date	Dec 5, 2033

Classification

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

Abstract

A twist drill has a shaft and a flute portion, which extends between a drill tip and the shaft and has at least two flutes, which run helically around it at an angle of twist, are separated from one another by two webs and have a land extending between the flutes on the circumference of the flute portion. In order to provide a twist drill that has the features mentioned at the beginning, has better lubrication of the round bevels, less wear, improved guidance and improved concentricity, at least two round bevels that are spaced apart from one another are provided on each land and extend on the land at an angle of inclination in relation to the drill axis that is greater than the angle of twist but less than 90°.

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