ROOF DRILL BIT, ROOF DRILL BIT BODY AND HARD CUTTING INSERT FOR ROOF DRILL BIT

摘要

A roof drill bit (18) has an elongate roof drill bit body (20), which has a forward end (22) and a rearward end (24). The roof drill bit body (20) contains a slot (28A) at the forward end (22). The roof drill bit body (20) contains a dust port (50A, 50B) wherein the dust port (50A, 50B) has a central longitudinal dust axis (D-D). The roof drill bit further has a hard insert (72) received within the slot (28) wherein the hard insert (72) has a leading surface (82). The leading surface (82) of the hard insert (72) is rotationally forward of the central longitudinal dust axis (D-D) of the dust port (50A, 50B).