Hull Corporation

William McDowall

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. However, if an obstacle or other impurity is present between the confronting mold surfaces, the resulting space between said surfaces allows gas pressure to leak into it, and the resulting drop in gas pressure at the pressure switch prevents the application of high closing pressure to the movable mold section.

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Girvan, United Kingdom

William McDowall