Apparatus for air-pressure forming thermoplastic resin sheets
AssigneeMitsubishi Monsanto Kasei Kabushiki Kaisha
InventorMasaji Yamamori
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Abstract
A method of and an apparatus for air-pressure forming of a sheet of thermoplastic resin wherein a sheet of thermoplastic resin is formed to a desired shape under a substantially constant controlled air pressure. The apparatus includes a compressed air generating device comprising an air cylinder having a first piston slidable therewithin, a hydraulic cylinder having a second piston slidable therewithin and connected mechanically to the first piston, whereby compressed air pressure produced by the first piston balances with hydraulic pressure so as to be maintained at a substantially constant level during the whole forming operation.
Claims7
In an apparatus for air-pressure forming of thermoplastic resin sheets comprising a set of mold means having a plurality of air purging holes and complementary means having a plurality of compressed air blowing holes and air compressing means for supplying air at a specific pressure to said compressed air blowing holes, said set of mold means and complementary means being disposed in mutually opposed state so adapted that at least one of said means can be moved toward and away from the other, the improvement wherein said air compressing means comprises compressed air generating cylinder means, first piston means movable slidably within said compressed air generating cylinder means, hydraulic cylinder means, and second piston means movable slidably in said hydraulic cylinder means, said first piston means being mechanically connected to and driven by said second piston means which is in turn operatively connected to means for generating a substantially constant hydraulic pressure.
Dependencies are inferred from the claim text.