Twist drill
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United States of America Patent
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Jan 10, 2017
Grant Date -
Nov 5, 2015
app pub date -
Dec 5, 2013
filing date -
Dec 20, 2012
priority date (Note) -
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status (Latency Note)
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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°.
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