Drill bit with large inserts
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United States of America Patent
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Jul 19, 2005
Grant Date -
Dec 6, 2001
app pub date -
Jun 25, 1998
filing date -
Jun 30, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystalline diamond layer located at least in the gage row and a plurality of smaller inserts located at least in the inner rows.
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