Expandable core-former

Claim 1

AN EXPANDABLE CORE-FORMER, COMPRISING A PLURALITY OF CORE SEGMENTS MOVABLE IN RESPECT TO EACH OTHER AND EACH HAVING A CONCAVE INWARDLY PRESENTED FACE PROVIDED WITH A PLURALITY OF SPACED RECESSESLYING IN THE PLANE OF AN OBLIQUE CORE-FORMER AXIS, A ROLLER CARRIED IN EACH OF SAID RECESSES, A FIRST SHAFT HAVING MEANS SLIDABLY CONNECTED TO SAID CORE SEGMENTS FOR GUIDING THE MOVEMENTS OF SAID CORE SEGMENTS WITH RESPECT TO EACH OTHER, SAID FIRST SHAFT BEING AXIALLY MOVABLE FOR MOVING THE CORE-FORMER TO AND FROM AN OPERATIVE POSITIONIN THE MOLD, A SECOND SHAFT CARRIED IN SAID FIRST SHAFT IN A FIXED AXIAL POSITION WITH RESPECT TO SAID CORE SEGMENTS AND ROTATABLE WITH RESPECT TO SAID FIRST SHAFT, SAID SECOND SHAFT PROJECTING BEYOND SAID FIRST SHAFT AND INTERPOSED BETWEEN THE CORE SEGMENTS AND HAVING CAN MEANS MOUNTED IN A FIXED AXIAL POSITION THEREON AND ROTATABLE THEREWITH, SAID CAM MEANS COMPRISING CAM LOBES DISPOSED IN THRUST-TRANSMITTING ENGAGEMENT WITH SAID ROLLERS UPON ROTATION OF SAID SECOND SHAFT IN ONE DIRECTION TO FORCE SAID CORE SEGMENTS UNIEXPAND THE CORE-FORMER AND INTERPOSED BETWEEN SAID ROLLERS IN THE PLANES OF THE TRANSVERSE CORE-FORMER AXES UPON ROTATION OF SAID SECOND SHAFT IN AN OPPOSITE DIRECTION, MEANS OPERATIVELY INTERCONNECTING SAID CORE SEGMENTS AND MOVING THEM TOWARD EACH OTHER TO COLLAPSE THE COREFORMER UPON ROTATION OF SAID SECOND SHAFT IN SAID OPPOSITE DIRECTION, A PLURALITY OF FACE PLATES ON SAID CORE SEGMENTS BRIDGING THE SPACES THEREBETWEEN WHEN THE CORE SEGMENTS ARE IN SPACED RELATION TO EACH OTHER, AND A PILOT PLATE SLIDABLY ENGAGEABLE WITH ONE END OF THE CORE SEGMENTS WITH A PILOT PROJECTING OUTWARDLY THEREFROM FOR RELEASABLY RETAINING THE CORE-FORMER IN A FIXED NONROTATABLE POSITION IN A MOLD, SAID FACE PLATES HAVING COVER PLATES AT EACH OF THEIR ENDS EXTENDING INWARDLY OVER THE MEANS ON SAID FIRST SHAFT AND PILOT PLATE TO CLOSE THE ENDS OF THE COREFORMER.