Earth-boring bit with improved cutting structure
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United States of America Patent
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Oct 13, 1998
Issued Date -
N/A
app pub date -
Aug 6, 1996
filing date -
Jul 8, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one scraper cutting element is secured at least partially to the heel surface of the cutter. The scraper cutting element includes an outermost surface, generally aligned with the gage surface of the cutter, that defines a plow edge or point for shearing engagement with the sidewall of the borehole while redirecting cuttings up the borehole.
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