Earth-boring bit with improved cutting structure
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United States of America Patent
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Aug 6, 1996
Issued Date -
N/A
app pub date -
Jan 17, 1995
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 chisel-shaped cutting element is secured to the gage surface. The chisel-shaped cutting element has a pair of surfaces converging to define a circumferential crest and is tilted toward the heel surface such that a line drawn through the center of the cutting element and its crest defines an acute angle of between about 15 and 75 degrees with the gage surface of the cutter.
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