Kennametal Inc.
ROOF DRILL BIT AND CUTTING INSERT THEREFOR

Abstract:

A roof drill bit has an elongate roof drill bit body having a forward end and a rearward end. The bit body includes at least one helical twisted surface terminating at a dust port and a feeder ledge proximate the at least one helical twisted surface. A hard insert is affixed to the bit body at the axial forward end thereof. The hard insert includes a plurality of leading cutting edges for cutting the earth strata. The at least one helical twisted surface and the feeder ledge enhance the flow of debris into the dust port.