Cutting by use of rotating axially moving tool – Tool of specific diverse material
Reexamination Certificate
2006-08-29
2006-08-29
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool of specific diverse material
C175S415000, C408S226000, C408S227000
Reexamination Certificate
active
07097396
ABSTRACT:
An object of the present invention is to provide a drill bit which is simple in design, high in rigidity, and superior in durability and whose drilling function is in no way inferior to that of conventional drilling bits. To this end, in a drill bit comprising a cutting blade tip2which is united tightly to a tip end of a bit body1and a plurality of cutting blade portions2a, 2band2cwhich are formed around the cutting blade tip2, a flat surface portion3is formed in a side surface of the drill bit from between adjacent cutting blade portions to a base portion of the bit body1so that the bit body1is formed into a straight configuration having an approximately polygonal cross section.
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Supplementary European Search Report (and Annex) by The Hague, dated May 27, 2004 for European Patent Application EP 00 97 9974.
Howell Daniel W.
Kabushiki Kaisha Miyanaga
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