Patent ID: 7392866
Filing Date: 2008-07-01
Classification: E21B

Abstract:
1. A heavy duty drill tool for performing a sequential series of roof boring operations for a roof bolting matrix in metal/non-metal mines, comprising: a drill bit section having a high fatigue-resistant steel body constructed and arranged with PCD cutter inserts for forming a bore hole diameter up to about 2¼ inches, said PCD cutter inserts being disc-shaped wafers and having a thickness up to about 0.290 inches, and said steel body including a heavy duty shank constructed for connecting the drill bit section, said shank having a connecting dimension in the range of 9/16 to ¾ inch; and a reamer section having a high fatigue-resistant steel body constructed and arranged with a cutting insert and being secured to the heavy duty shank to thereby form a coupler means for connecting the drill bit section to a drilling apparatus set at optimum drilling parameters for hard/soft rock formations.