MINER CUTTING BIT HOLDING APPARATUS

摘要

Apparatus for supporting a cutting bit having an extended shank on a rotatable cutting drum is provided. The support apparatus includes a bit holder having an upper body portion and a shank portion and a generally rectangular mounting base having rear, side and front members. The upper body of the bit holder includes a bore for receiving the cutting bit shank and upper rear abutment surfaces perpendicular to the bit axis. The shank of the bit holder has a lower rear abutment surface parallel to the bit axis and a threaded bore which extends into the shank intermediate the upper and lower abutment surfaces. The rear portion of the mounting base includes upper abutment surfaces perpendicular to the bit axis and a lower abutment surface parallel to the bit axis. A draw bolt passes through the rear portion of the mounting base and serves to draw the upper and lower abutment surfaces of the bit holder and mounting base, respectively, into engagement.