Expandable core-former

Claim 1

AN EXPANDABLE CORE-FORMER, COMPRISING A PLURALITY OF CORE SEGMENTS HAVING L-SHAPED CROSS-SECTIONS MOVABLE WITH RESPECT TO EACH OTHER BETWEEN A RETRACTED POSITION IN WHICH THEY ABUT EACH OTHER AND AN EXTENDED POSITION IN WHICH THEY ARE IN SPACED RELATION TO EACH OTHER, EACH OF SAID CORE SEGMENTS HAVING A THRUST-RECEIVING FACE ON AN OBLIQUE AXIS OF THE CORE-FORMER, A FIRST SHAFT MOVABLE FOR MOVING THE CORE-FORMER TO AND FROM AN OPERATIVE POSITION IN A MOLD AND HAVING MEANS SLIDABLY CONNECTED TO SAID CORE SEGMENTS FOR GUIDING THE MOVEMENTS OF SAID CORE A FIXED AXIAL POSITION ON SAID SECOND SHAFT WHEREBY ROTATABLY CARRIED IN SAID FIRST SHAFT AND INTERPOSED BETWEEN SAID CORE SEGMENTS, A PLURALITY OF CAM FACES ON SAID SECOND SHAFT, SAID CAM AND THRUST-RECEIVING FACES EXTENDING SUBSTANTIALLY THE LENGTHS OF SAID CORE SEGMENTS, A PLURALITY OF CAM FOLLOWERS SWINGABLY CONNECTED TO SAID SECOND SHAFT AND SAID CORE SEGMENTS ENGAGEABLE WITH SAID CAM FACES AND THRUST-RECEIVING FACES IN ABUTTING FACE TO FACE RELATION ALONG SUBSTANTIALLY THE LENGTHS THEREOF UPON ROTATION OF SAID SECOND SHAFT IN ONE DIRECTION TO SIMULTANEOUSLY FORCE SAID CORE SEGMENTS OUTWARDLY INTO SPACED RELATION OF EACH OTHER TO EXPAND THE CORE-FORMER AND TO PULL SAID CORE SEGMENTS INWARDLY UPON ROTATION OF SAID SECOND SHAFT IN AN OPPOSITE DIRECTION TO COLLAPSE SAID COREFORMER, AND MEANS BRIDGING AND CLOSING THE SPACES BETWEEN TOPS, BOTTOMS, AND SIDES OF SAID CORE SEGMENTS.