Abstract: An inlet gas pressure passageway is associated with the movable mold section of a molding press and terminates at and therefore in the plane of the surface of said movable mold section which confronts the surface of the fixed mold section of the press. An outlet gas pressure passageway is associated with the fixed mold section and terminates at and therefore in the plane of the surface of said fixed mold section in alignment with the inlet passageway opening. Air or other gas under a predetermined superatmospheric is applied to the inlet passageway for delivery to the outlet passageway, and the latter is connected to a pressure switch operable at said predetermined gas pressure to effect application of high hydraulic closing pressure to the movable mold section.

Abstract: There is provided a form of assembled elements for pouring concrete, the form consisting primarily of elements made of synthetic materials. These elements include a molding face of elastomer, a rear face having grooves, an envelope filler of rigid foam, and edges having a reinforced lip and attachment points for assembly means. The form includes a reinforcing framework made of metallic profile members. It is maintained in place by a support scaffold of triangular trellis construction. The elements have a size and weight which permits them to be handled by a single person.