Drag type drill bit
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United States of America Patent
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-
Apr 28, 1987
Issued Date -
N/A
app pub date -
Aug 6, 1985
filing date -
Feb 22, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drag-type drill bit comprises a bit body having an operating end face and a multiplicity of superhard cutting elements interlocked to the bit body. The cutting elements define a multiplicity of cutting areas dispersed over the operating end face of the bit body in a pattern adapted to cause the cutting areas to cut an earth formation to a desired three-dimensional profile as the bit body is rotated. The cutting areas have back rake angles which become more negative with distance from said profile.
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