Patent ID: 6764141
Filing Date: 2004-07-20
Classification: E21C,E21F

Abstract:
An assembly for mounting a cutter bit on a driven mechanism, said assembly comprising:a bit, a bit holder including a holding portion adapted to receive said bit, said bit holder having a bit mounting base having a forward portion and a mounting base rear portion having an internal water passageway, and a rear surface having a spray nozzle cavity in the rear surface and open in a rearward direction, said spray nozzle cavity having an internal spray nozzle cavity water passageway in communication with the mounting base rear portion internal water passageway, a dust reduction unit including a spray nozzle comprising a base received in said spray nozzle cavity and having a spray nozzle base water passageway through said spray nozzle base and in communication with said spray nozzle cavity water passageway, and a spray orifice in communication with said spray nozzle base water passageway, and means for connecting the spray nozzle to the mounting base rear portion.