Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2008-04-08
2008-04-08
Ross, Dana (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C408S230000
Reexamination Certificate
active
11124095
ABSTRACT:
A drill including a chisel edge provided at a tip end portion, a spiral first chip discharging groove and a spiral second chip discharging groove, land portions provided between the first chip discharging groove and the second chip discharging groove, and a cut blade provided at an edge of a rake surface of the first chip discharging groove, characterized in that the first chip discharging groove and the second chip discharging groove are provided asymmetrically with respect to a drill rotational center and a land portion behind the first chip discharging groove is larger than a land portion behind the second chip discharging groove.
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Takahashi Shoichi
Wakui Hideo
Watanabe Hidehito
Ross Dana
Sughrue & Mion, PLLC
Talbot Michael W.
Union Tool Co.
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