Molding apparatus

Claim 1

A MOLDING APPARATUS COMPRISING A BOOK FRAME OF TWO LEAVES CONNECTED AT ONE END OF EACH BY A HINGE ASSEMBLY, A PAIR OF LUGS AFFIXED TO AND PROJECTING INWARDLY FROM THE OPOSED INNER FACES OF EACH OF SAID LEAVES AT SIMILARLY SPACED POINTS LONGITUDINALLY THEREOF, RELEASABLE MEANS FOR HOLDING SAID LEAVES WITH THE LUGS OF EACH IN CONTACT WITH THE LUGS OF THE OTHER WHEREBY THE OPPOSED INNER FACES OF SAID LEAVES AND THE OPPOSED SURFACES OF SAID LUGS ENCLOSE FOUR SIDES OF A SPACE OPEN ALONG THE EDGES OF SAID BOOK FRAME, A PLURALITY OF REMOVABLE, INTERCHANGEABLE AND REUSABLE CAVITY-FORMING INSERT BLOCKS EACH HAVING A QUARTERMOLD-CAVITY-FORMING DEPRESSION OPENING OPON ONE PLANAR SURFACE THEREOF AND UPON A SURFACE PERPENDICULARLY DISPOSED TO SAID PLANAR SURFACE, ALL OF SAID BLOCKS BEING OF THE SAME CROSS SECTIONAL DIMENSIONS WHEREBY THEY MAY BE INTERCHANGEABLY PAIRED IN SIDE-BY-SIDE, HALF-CAVITY FORMING, ABUTTING RELATION TRANSVERSELY OF THE INNER FACE OF EACH OF SAID LEAVES AT ONE POSITION RELATIVE TO THE LENGTH OF THE LEAVES, AND WHEREBY THE MOLD CAVITY DEPRESSIONS OF AT LEAST FOUR OF SAIDBLOCKS THUS ARRANGED WILL BE IN REGISTRY TO DEFINE A COMPLETE MOLD CAVITY, THE SHAPE OF WHICH MAY BE CHANGED BY INTERCHANGING SAID BLOCKS WITHIN THE FOUR OR WITH OTHER SUCH BLOCKS WHICH ARE ALSO POSITIONED IN SIDE-BY-SIDE RELATION AGAINST THE INNER FACE OF SAID LEAVES AND WHICH COMPLETELY OCCUPY THE REMAINING SPACE BETWEEN SAID LUGS.