Invention Grant
- Patent Title: Twist drill
- Patent Title (中): 麻花钻
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Application No.: US14649318Application Date: 2013-12-05
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Publication No.: US09539653B2Publication Date: 2017-01-10
- Inventor: Siegfried Rogalla , Stefan Thoma
- Applicant: Walter AG
- Applicant Address: DE Tübingen
- Assignee: Walter AG
- Current Assignee: Walter AG
- Current Assignee Address: DE Tübingen
- Agency: Morgan, Lewis & Bockius LLP
- Priority: DE102012112781 20121220
- International Application: PCT/EP2013/075676 WO 20131205
- International Announcement: WO2014/095395 WO 20140626
- Main IPC: B23B51/02
- IPC: B23B51/02

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°.
Public/Granted literature
- US20150314378A1 TWIST DRILL Public/Granted day:2015-11-05
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