Apparatus for producing seamless pipe

Claim 1

A CASTING AND EXTRUDING APPARATUS, COMPRISING, IN COMBINATION, A CONTAINER HAVING INLET MEANS FOR INTRODUCING A METAL INTO SAID CONTAINER, AND AN OUTLET NOZZLE; FIRST CLOSURE MEANS FOR CLOSING SAID INLET MEANS; AN ELONGATED MEMBER EXTENDING INTO SAID CONTAINER AND HAVING A PROJECTING PORTION PROJECTING OUT OF THE SAME; SECOND CLOSURE MEANS FOR CLOSING SAID OUTLET NOZZLE; MEANS ON SAID CONTAINER FOR VARYING THE TEMPERATURE OF A METAL THEREIN; MEANS FOR INTRODUCING A GAS UNDER HIGH PRESSURE INTO THE CONTAINER SO THAT THE METAL ASSUMES A SELECTED VISCOUS CONDITION AT A SELECTED TEMPERATURE AND PRESSURE; A MOTOR OPERATIVELY CONNECTED TO SAID PROJECTING PORTION OF SAID ELONGATED MEMBER FOR RECIPROCATING THE SAME SO THAT THE RESISTANCE ENCOUNTERED BY SAID ELONGATED MEMBER IN THE METAL INCREASES AS THE METAL ASSUMES A VISCOUS CONDITION; MEASURING MEANS CONNECTED TO SAID MOTOR FOR MEASURING THE SPEED OF SAID MOTOR SO THAT THE REDUCTION OF THE MOTOR SPEED DUE TO THE GREATER RESISTANCE OF THE VISCOUS METAL IS A MEASURE OF THE VISCOSITY OF THE METAL; AND MEANS FOR OPENING SAID SECOND CLOSURE MEANS WHEN SAID MEASURING MEANS INDICATE SAID SELECTED VISCOUS CONDITION WHEREBY THE METAL IS EXTRUDED THROUGH SAID OUTLET NOZZLE AND ASSUMES A SOLID STATE UNDER ATMOSPHERIC PRESSURE.