Roof drilling system improvements

Details Roof drilling system improvements Roof drilling system improvements

2008-07-01

2008-07-01

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S425000, C175S421000, C405S259100

Reexamination Certificate

active

11553063

ABSTRACT:
The invention is embodied in a heavy duty drill bit for hard/soft rock drilling comprising a high fatigue-resistant, high alloy steel bit body having a PCD cutter member and an enlarged shank portion constructed to accommodate torsional forces at high thrust pressures, and reamer means for compensating the effect of bore hole rifling. The invention further involves the method of forming a roof bolting matrix in extremely hard rock formations having a compression strength up to about 50,000 psi using PCD wafers on a high tensile strength steel body coupled by a heavy duty shank through high fatigue-resistant reamer means to a high strength drive steel member.

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