Spade drill bit
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United States of America Patent
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-
Sep 11, 2007
Grant Date -
Apr 20, 2006
app pub date -
Mar 11, 2003
filing date -
Mar 11, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A spade drill bit (202) comprises a shaft (204) having one end (205) configured to be engaged to a driving tool and a cutting head (206) attached at an opposite end of said shaft (204). The cutting head (206) includes a center point (216) having threads (240) defined thereon, including continuous threads (247) adjacent the tip and discontinuous threads (242) thereafter toward the base.
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