Magnetic core latch

Claim 1

A CASTING APPARATUS COMPRISING A GENERALLY CYLINDRICAL MOLD MOUNTED ROTATABLY ABOUT ITS LONGITUDINAL AXIS, A STOP MEANS OF FERROMAGNETIC MATERIAL ATTACHED TO AN END OF THE MOLD, AN ELECTROMAGNETIC COIL MOUNTED IN FIXED FIXED POSITION ADJACENT SAID END OF THE MOLD COAXIALLY WITH THE AXIS OF ROTATION, A FERROMAGNETIC CLADDING AROUND SAID COIL HAVING A CIRCUMFERENTIAL GAP ALONG THE INSIDE PERIPHERY OF THE COIL, SAID ELECTROMAGNETIC COIL BEING POSITIONED IN RELATION TO THE END OF THE MOLD SO THAT THE STOP MEANS EXTENDS INSIDE THE COILL AND PROJECTS BEYOND THE INNER EDGE OF THE GAP IN SAID CLADDING, A RING OF FERROMAGNETIC MATERIAL POSITIONED INSIDE THE COIL SO AS TO PORJECT INWARD BEYOND THE OUTER EDGE OF THE GAP IN THE CLADDING, SAID RING BEING PULLED AGAINST THE STOP WHEN THE COIL IS ENERGIZED WHEREBY THE GAP IN THE CLADDING IS BRIDGED BY FERROMAGNETIC MATERIAL, SAID STOP AND SAID RING BEING FREE TO ROTATE WITH SAID MOLD, AND MEANS ATTACHED TO SAID RING FOR SUPPORTING AN END FORMING MEANS IN SEALING ENGAGEMENT WITH THE END OF THE MOLD WHEN SAID RING IS PULLED AGAINST SAID STOP.