Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Reexamination Certificate
2005-02-04
2008-09-09
Howell, Daniel W (Department: 3726)
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
C408S0010BD, C408S230000
Reexamination Certificate
active
07422396
ABSTRACT:
A drill which includes a cylindrical main body and a shank contiguous to each other, and which is to be rotated about an axis of the cylindrical main body in a predetermined rotating direction, for enlarging a hole previously formed in a workpiece through a die-casting process. The cylindrical main body has flutes which are formed in the cylindrical mainbody and extend from an axially distal end portion of the cylindrical main body toward the shank, so as to provide cutting edges in the axially distal end portion of the cylindrical main body. The cutting edges cooperate with each other to define a point angle which is larger than 170° and is smaller than 180°. Each of the cutting edges is substantially straight or is curved to be convexed as seen in the direction perpendicular to the axis.
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Howell Daniel W
Muramatsu & Associates
OSG Corporation
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