Pouring tube for pressure pouring apparatus

Claim 1

IN COMBINATION WITH PRESSURE POURING APPARATUS OF THE TYPE WHEREIN LIQUID MATERIAL IS FORCED BY THE EXERTION OF SUPER-ATMOSPHERIC GAS PRESSURE THEREAGAINST FROM A GAS-TIGHT CONTAINER TO A MOLD DISPOSED EXTERIOR THE CONTAINER, MEANS FOR INTRODUCING GAS UNDER PRESSURE, A MOUNTING MEMBER DISPOSED WITHIN AN APERTURE OF THE CONTAINER AND HAVING A BORE EXTENDING THERETHROUGH INTO THE CONTAINER, AN EROSION RESISTANT, REFRACTORY POURING TUBE HAVING ONE END DISPOSED TO EXTEND THROUGH THE BORE IN THE MEMBER AND INTO THE MATERIAL TO BE POURED AND HAVING THE OTHER END IN COMMUNICATION WITH THE MOLD, AND RELATIVELY THICK THERMALLY INSULATING JACKET ENVELOPING CONTIGUOUSLY A PORTION OF THE OUTER SURFACE OF SAID TUBE EXTENDING FROM THE MATERIAL TO THE CONTAINER APERTURE A SUFFICIENT DISTANCE TO MAINTAIN THE TEMPERATURE OF SAID OUTER SURFACE AS CLOSE AS POSSIBLE TO THE TEMPERATURE OF THE MATERIAL TO BE POURED TO THEREBY PREVENT A TEMPERATURE GRADIENT IN SAID TUBE PORTION AS WOULD CAUSE TENSILE FAILURE THEREOF DUE TO TANGENTIAL STRESS.