Molding apparatus

Claim 1

A MOLD FOR CASTING CONCRETE STRUCTURAL ELEMENTS COMPRISING A RIGID BASE STRUCTURE, AN ELONGATED CHANNEL SHAPED MOLD MOUNTED ON SAID RIGID BASE STRUCTURE, SAID MOLD HAVING A BOTTOM WALL FORMED OF RELATIVELY FLEXIBLE SHEET METAL WITH SAID BOTTOM WALL BEING ATTACHED TO AND STIFFENED ALONG ITS LENGTH BY SAID BASE STRUCTURE, SAID MOLD HAVING A FIRST SIDE WALL MOUNTED ON SAID BASE STRUCTURE AND A SECOND SIDE WALL FORMED OF RELATIVELY FLEXIBLE SHEET METAL JOINTED TO AND UNITARY WITH SAID BOTTOM WALL, SAID RIGID BASE STRUCTURE HAVING EXTENSION MEANS PROJECTING LATERALLY PAST SAID SECOND SIDE WALL, SAID SECOND SIDE WALL BEING STIFFENED BY LONGITUDINALLY SPACED RIGID LEGS THAT EXTEND SUBSTANTIALLY FROM THE LOWER EDGE OF THE WALL TO ITS UPPER EDGE, THE JUNCTION OF SAID STIFFENED SIDE AND BOTTOM WALLS FORMING A RESILIENT HINGE, SAID HINGE NORMALLY POSITIONING SAID SECOND SIDE WALL IN AN OPEN-MOLD POSITION WHEREIN THE UPPER EDGES OF SAID WALLS HAVE A PREDETERMINED SPACING, LATERALLY PROJECTING LEVERS FIXED TO THE STIFFENING LEGS OF SAID SECOND SIDE WALL AND INCLINED AT AN ACUTE ANGLE OUTWARDLY AND UPWARDLY TO SAID BASE STRUCTURE, AND ACTUATING MEANS LOCATED BELOW SAID LEVERS AND MOUNTED ON SAID BASE STRUCTURE EXTENSION MEANS AND IN CONTACT WITH SAID LEVERS FOR FLEXING SAID RESILIENT HINGE TO DECREASE THE SPACING OF THE UPPER EDGES OF SAID SIDE WALLS AND BRING SAID SECOND SIDE WALL INTO A CLOSED-MOLD POSITION, SAID ACTUATING MEANS BEING LATERALLY ADJUSTABLE TO ADJUST THE CLOSED MOLD POSITION OF SAID SECOND SIDE WALL.