ROTATABLE CUTTING BIT ASSEMBLY WITH WEDGE-LOCK RETENTION ASSEMBLY

摘要

A cutting bit has a bit body (180) which has a forward end (182) and a rearward end (216). The bit body (181) contains a seat at the forward end (182) thereof. The bit body (181) contains a bore intersecting the seat wherein a bore wall defines the bore. A cutting insert (196) is received by the seat wherein the cutting insert presents a side surface (198) facing the bore. A wedge (206) has a generally longitudinal seating surface. The wedge (206) has a support surface opposite to the longitudinal seating surface. The wedge (206) is received within the bore so that the longitudinal seating surface of the wedge (206) contacts the side surface (198) of the cutting insert (196) and for at least a portion of the length of the wedge (206) the entire support surface contacts the bore wall so as to frictionally retain the cutting insert (196) in the seat.