Drill bit
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United States of America Patent
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Jul 22, 2014
Grant Date -
Mar 15, 2012
app pub date -
Sep 9, 2010
filing date -
Sep 9, 2010
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A drill bit for a boring tool comprises a shank configured for engagement with the boring tool and a working tip having a first end attached to the shank and an opposite second end, and a conical helical thread extending substantially continuously from end to end. The thread root may include a rounded portion while the crest may be flat. The configuration of the helical thread, such as the crest width, thread depth, thread angle, cross sectional area and base width are adjusted as a function of the length of the threaded working tip to maximize bending strength and optimize thread wear and operability.
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