Earth-boring bit having shear-cutting inner row elements
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United States of America Patent
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May 5, 1998
Issued Date -
N/A
app pub date -
Aug 12, 1996
filing date -
Jun 6, 1996
priority date (Note) -
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Abstract
An earth-boring bit has a bit body and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows, including inner heel rows, of cutting elements. At least one of the cutting elements in one of the inner rows has a crest at least partially formed of super-hard material that defines a cutting edge and cutting surface for shearing engagement with the bottom of the borehole during drilling operations, the remainder of the cutting end of the element is formed of hard, fracture-tough material for crushing engagement with the bottom of the borehole.
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