Injection mold assembly with means for shearing sprue from finished article

Claim 1

IN AN INJECTION MOLD ASSEMBLY FOR APPLYING BOTTOMS TO FOOTWEAR, A SOLE PLATE AND MOLD RING WHICH CONSTITUTE THE BOTTOM AND SIDE WALL OF THE MOLD CAVITY FOR RECEIVING AN ELASTOMER TO FORM A BOTTOM HAVING A TREAD SURFACE AND A PERIPHERAL EDGE, SAID MOLD RING EMBODYING SIDE WALL PARTS SEPARABLE TO PERMIT REMOVING THE FINISHED ARTICLE, TWO OF SAID SIDE WALL PARTS CONTAINING AT THEIR INTERFACES GROOVES WHICH COLLECTIVELY FORM AN INJECTION PASSAGE PART WAY THROUGH THE SIDE WALL; A CONDUCTOR EXTENDING FROM THE PASSAGE THE REMAINDER OF THE WAY THROUGH THE SIDE WALL THROUGH WHICH ELASTOMER SUPPLIED TO THE PASSAGE ENTERS THE MOLD CAVITY, SAID CONDUCTOR TERMINATING AT THE INTERIOR SURFACE OF THE SIDE WALL, SAID CONDUCTOR BEING EMBODIED IN ONE OF THE PARTS EXCLUSIVELY OF THE OTHER AND BEING OPERABLE, BY RELATIVE MOVEMENT OF THE PARTS, WHEN THEY ARE SEPARATED TO FREE THE ARTICLE FROM THE MOLD, TO SHEAR THE SPRUE FROM THE EDGE OF THE FORMED BOTTOM AT ITS PLACE OF JUNTION THEREWITH.