Monolithic roof cutting bit insert

Details Monolithic roof cutting bit insert Monolithic roof cutting bit insert

2005-03-01

2005-03-01

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S391000, C175S431000

Reexamination Certificate

active

06860344

ABSTRACT:
A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata. Each cutting edge is stepped.

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