Earth-boring bit having improved cutting structure
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United States of America Patent
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Dec 16, 1997
Grant Date -
N/A
app pub date -
Aug 7, 1996
filing date -
Jun 30, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bit body has 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 on the cutter, the rows including a heel row. The cutting elements in the heel row include at least one chisel-shaped cutting element having a crest oriented transversely to the axis of rotation of the cutter. The remainder of the cutting elements in the heel row have a configuration different from the chisel-shaped elements. All of the cutting elements have approximately the same projection from the surface of the cutter.
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