Drill bit with large inserts

Details Drill bit with large inserts Drill bit with large inserts

2005-07-19

2005-07-19

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S420100, C175S426000, C175S415000

Reexamination Certificate

active

06918455

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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Sandvik Rock Tools Percussive Hammers and Bits Trouble Shooting Guide, 1994;71-73,76-79, & 81-85; published in the USA.

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