Patent ID: 8066334

Claim:
Tool for cutting coke and other hard material in drums, comprising: a casing ( 2 ) having flow channels ( 10 , 13 ) leading to outwardly oriented boring and cutting nozzles ( 15 , 11 , 12 ); a valve mechanism rotatable relative to the casing about a coupling angle for releasing and closing ports ( 31 , 32 , 33 ) of the flow channels ( 10 , 13 ), wherein in a first boring coupling position of the valve mechanism the ports ( 33 ) of the flow channels ( 13 ) running to the boring nozzles ( 15 ) are released and the ports ( 31 , 32 ) of the flow channels ( 10 ) running to the cutting nozzles ( 11 , 12 ) are closed, and wherein in a second cutting coupling position of the valve mechanism the ports ( 31 , 32 ) of the flow channels ( 10 ) running to the cutting nozzles ( 11 , 12 ) are released, and the ports ( 33 ) of the flow channels ( 13 ) running to the boring nozzles ( 15 ) are closed; wherein the valve mechanism can be switched between the first boring coupling position and the second cutting coupling position at a water pressure reduced to a coupling pressure by rotating the valve mechanism about the coupling angle; wherein the valve mechanism comprises a cylindrically shaped valve body ( 7 ) positioned in a water intake area ( 6 ) of the casing ( 2 ), wherein the valve body defines a section ( 8 a ) of the water flow path for water entering the casing ( 2 ), wherein the casing ( 2 ) has an inner wall ( 9 ) defining a cylindrical section ( 8 ) and wherein the valve body ( 7 ) can be lifted and lowered between an upper and a lower position in the cylindrical section ( 8 ), and wherein the valve body ( 7 ) is moved at working pressure, against tension from a spring ( 22 ) to the lower position wherein the valve mechanism switches to one of the boring or cutting function, and wherein at coupling pressure the valve body ( 7 ) is moved by tension from the spring to the upper position, and wherein each upward and downward motion of the valve body ( 7 ) relative to the cylindrical section ( 8 ) controls rotation of the valve body ( 7 ) about the coupling angle.