Mold for and a method of producing large bodies of foamed polystyrene

Claim 1

A MOLD FOR THE MANUFACTURE OF LARGE RECTANGULAR BLOCKS OF FOAMED POLYSTYRENE BY HEATING AND EXPANDING PRE-FOAMED MATERIAL UNDER THE INFLUENCE OF STEAM COMPRISING AN OUTER CUBICAL MOLD FRAME COMPOSED OF TWO ADJACENT SIDE WALLS RIGIDLY CONNECTED TO THE MOLD BOTTOM, TWO FURTHER ADJACENT SIDE WALLS EACH OF WHICH BEING ARTICULATED TO ONE OF SAID RIGID SIDE WALLS, A COVER EQUALLY ARTICULAED TO ONE OF SAID RIGID SIDE WALLS, MEANS FOR LOCKING SAID ARTICULATED SIDE WALLS TO EACH OTHER AND TO THE BOTTOM AND FOR LOCKING SAID ARTICULATED COVER TO THE MOLD FRAME WHEN BEING IN CLOSED POSITION, A PLURALITY OF PARALLEL PERFORATED VERTICAL PARTITIONS WITHIN THE MOLD FRAME EXTENDING FROM THE MOLD BOTTOM TO THE MOLD COVER FOR SUBDIVIDING THE MOLD INTO A PLURALITY OF CHAMBERS OF SUBSTANTIALLY EQUAL DIMENSIONS SERVING AS EXPANSION CHAMBERS FOR THE DEVELOPMENT OF THE EXPANDABLE MATERIAL UNDER THE INFLUENCE OF HEAT, SAID VERTICAL PARTITIONS BEING LOOSELY CONNECTED TO OPPOSITE SIDE WALLS OF THE MOLD FRAME BY MEANS ALLOWING A RESTRICTED RECIPROCAL MOVEMENT OF THE PARTITIONS IN HORIZONTAL DIRECTION NORMALLY TO THEIR MAIN SURFACES, AND MEANS FOR CONNECTING AT LEAST SOME OF THE SIDE WALLS OF THE MOLD FRAME TO A STEAM CONNECTION SUPPLYING HOT STEAM INTO THE MOLD FOR THE DEVELOPMENT OF THE MATERIAL TO BE EXPANDED