CUTTING BIT USEFUL FOR IMPINGEMENT OF EARTH STRATA

摘要

A cutting bit (20) for impinging earth strata wherein the cutting bit includes a highly wear-resistant elongate cutting bit body (22), which has an axial forward end (24) and an axial rearward end (26), an enlarged dimension head portion (30) at the axial forward end and a reduced dimension shank portion (32) at the axial rearward end (26). The highly wear-resistant elongate cutting bit body (22) has a maximum transverse dimension (E) and a longitudinal axial length (B). The cutting bit includes a superhard insert (40), which is affixed to the head portion (30) at the axial forward end (24) of the cutting bit body (22). The cutting bit (40) has a slimness ratio, which comprises the ratio of the maximum transverse dimension (E) to the longitudinal axial length (B) wherein the cutting bit (40) exhibits a slimness ratio ranging between about 0.15 and about 0.60.