Core drill
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United States of America Patent
Stats
-
Jan 24, 2012
Grant Date -
Dec 4, 2008
app pub date -
Mar 11, 2005
filing date -
Mar 11, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To provide a user-friendly core drill which, when forming a large-diameter cut hole by the core drill with respect to an object to be drilled, such as concrete, is able to easily form, for example, a chamfered portion or a countersunk portion with respect to an opening end portion of the cut hole. In a core drill comprising a base body including a shank and a drill core body including a drill cutting blade, a connection opening portion of the drill core body being attached to the base body, the connection opening portion of the drill core body is provided with a concave portion forming member including a large-diameter hole cutting blade, and the large-diameter hole cutting blade is provided outside the drill cutting blade in a radial direction of the connection opening portion.
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