Core drill
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United States of America Patent
Stats
-
Dec 24, 2013
Grant Date -
Jul 28, 2011
app pub date -
Sep 30, 2009
filing date -
Oct 15, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An outer peripheral surface of a tip end portion of the core body has a tapered surface which is thinner toward the tip end and is edged at the tip end. Recesses 2B are formed at an opening peripheral edge of the tip end portion to attach cutting chips 3. A portion of the core body 2 which is adjacent to a forward portion of each of the recesses in the rotational direction is bent radially inward. Each of the cutting chips 3 has a stepped portion such that a radially inner portion 3a of a forward end portion protrudes forward and a radially outer portion of the forward end portion recedes rearward. A radially inner portion of a rearward end portion of the stepped portion is located forward and a radially outer portion of the rearward end portion is located rearward.
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