Expandable core-former

Claim 1

AN EXPANDABLE CORE-FORMER, COMPRISING A PLURALITY OF CORE SEGMENTS MOVABLE WITH RESPECT TO EACH OTHER AND HAVING CAM FOLLOWERS PROJECTING INWARDLY ON THE OBLIQUE CORE-FORMER AXES, A FIRST SHAFT MOVABLE FOR MOVING THE CORE-FORMER TO AND FROM AN OPERATIVE POSITION IN A MOLD, A FIRST SPIDER BLOCK MOUNTED ON SAID FIRST SHAFT AND HAVING A PLURALITY OF OUTWARDLY PROJECTING ARMS SLIDABLY RECEIVED IN OPENINGS FORMED IN THE CORE SEGMENTS ADJACENT ONE OF THEIR ENDS, A SECOND SHAFT ROTATABLY CARRIED IN SAID FIRST SHAFT AND FIRST SPIDER BLCOK AND INTERPOSED BETWEEN SAID CORE SEGMENTS, CAM MEANS ON SAID SECOND SHAFT ROTATABLE THEREWITH IN ONE DIRECTION TO ENGAGE SAID CAM FOLLOWERS AND FORCE SAID CORE SEGMENTS UNIFORMLY OUTWARDLY FROM EACH OTHER TO EXPAND THE CORE-FORMER, A SECOND SPIDER BLOCK ROTATABLY MOUNTED ON SAID SECOND SHAFT AT THE END OF SAID CAM MEANS REMOTE FROM SAID FIRST SPIDER BLOCK AND HAVING A PLURALITY OF OUTWARDLY PROJECTING ARMS PARALLEL WITH THE ARMS ON SAID FIRST SPIDER BLOCK AND SLIDABLY RECEIVED IN OPENINGS FORMED IN THE CORE SEGMENTS ADJACENT THEIR ENDS REMOTE FROM SAID FIRST SPIDER BLOCK, SPRING MEANS INTERCONNECTING EACH OF SAID CORE SEGMENTS TO SAID SPIDER BLOCKS TO MOVE SAID CORE SEGMENTS INWARDLY UPON ROTATION OF THE CAM MEANS IN AN OPPOSITE DIRECTION, SAID SPIDER BLOCK ARMS AND SPRING MEANS LYING IN THE PLANES OF THE OBLIQUE CORE-FORMER AXES, AND MEANS ON SAID SPIDER BLOCKS AND CORE SEGMENTS BRIDGING AND CLOSING THE SPACES BETWEEN TOPS, BOTTOMS, AND SIDES OF SAID CORE SEGMENTS.