Drill bit for drilling rock
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United States of America Patent
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Mar 9, 2004
Issued Date -
N/A
app pub date -
Jun 25, 2002
filing date -
Jul 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The drill bit is particularly suitable for drilling rock. An elongated shank carries at least one cutting insert at one end. Cutting edges are formed by adjoining flanks and rake faces which enclose a wedge angle .gamma.. The rake faces, between marginal segments at the circumference of the drill bit and segments at the center of the drill bit have one or more recesses which run right into the adjacent flanks. These recesses reduce the wedge angle .gamma., at least in a longitudinal section extending directly up to the cutting edges, relative to the remaining cutting-edge segments. In this way, an improved drilling capacity with good resistance to chipping of the cutting edges is achieved.
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