Apparatus for forming concrete planks or slabs having acoustical properties

Claim 1

APPARATUS FOR MANUFACTURING AN ELONGATED CORED CONCRETE STRUCTURAL MEMBER COMPRISING: A HORIZONTAL CASTING BED HAVING LONGITUDINALLY EXTENDING BOTTOM AND SIDE WALLS, MEANS FOR FORMING A LAYER OF CONCRETE ON THE BOTTOM WALL OF SAID BED, A FRAME ADAPTED TO BE MOVED LONGITUDINALLY OF SAID BED, A CORE MOLD DEPENDING FROM SAID FRAME WITHIN THE SIDE WALLS OF SAID BED, SAID MOLD HAVING LONGITUDINALLY EXTENDING TOP AND SIDE WALLS, AN OPEN BOTTOM AND AN OPEN END, THE LOWER EDGES OF SAID SIDE WALLS BEING IN CONTACT WITH THE LAYER OF CONCRETE ON THE BOTTOM WALL OF SAID BED, MEANS FOR FEEDING A LIGHTWEIGHT, FINELY DIVIDED MATERIAL TO THE INTERIOR OF SAID MOLD AND THEREBY DEPOSITING DIRECTLY ONTO SAID LAYER OF CONCRETE A LONGITUDINALLY EXTENDING CORE OF SAID MATERIAL, MEANS FOR SIMULTANEOUSLY DEPOSITING CONCRETE ON TOP OF SAID MOLD AND BETWEEN THE SIDE WALLS OF SAID MOLD AND THE SIDE WALLS OF SAID BED IN CONTACT WITH THE PORTIONS OF SAID LAYER OF CONCRETE LYING OUTWARDLY OF THE SIDE WALLS OF SAID MOLD, AND MEANS FOR MOVING SAID FRAME LONGITUDINALLY OF SAID BED IN A DIRECTION OPPOSITE THE OPEN END OF SAID MOLD CONTINUOUSLY DURING THE FEEDING OF SAID CORE MATERIAL AND THE DEPOSIT OF SAID FLUID CONCRETE, WHEREBY SAID CORE MATERIAL IS CONTINUOUSLY EXTRUDED THROUGH THE OPEN END OF SAID MOLD AND SIMULTANEOUSLY COVERED ON THE TOP AND SIDES THEREOF BY SAID FLUID CONCRETE WHILE THE SIDE WALLS OF SAID MOLD PREVENT THE FLUID CONCRETE FROM FLOWING LATERALLY INWARDLY AND DISPLACING THE CORE MATERIAL DEPOSITED ON SAID LAYER OF CONCERETE.