Pattern plate device for vacuum sealed molding

A pattern plate device for forming vacuum sealed molds in which a flexible film is sucked to the surfaces of said pattern plate device and placed in tight contact therewith comprising a frame body having a bottom plate and an encircling side wall to form an opening above the bottom plate, a pattern plate adapted to be detachably attached to said frame body, to cover said opening and to define a hollow chamber inside said encircling side wall, said pattern plate being provided with first communicating means along the periphery of said pattern plate for communicating the upper surface of the pattern plate with said hollow chamber and at least one through hole for communicating the upper surface of the pattern plate with said hollow chamber, a pattern provided on the upper surface of said pattern plate, and pressure reducing means disposed in said frame body and adapted to render a reduced pressure to said hollow chamber for producing a sucking action in said first communicating means so that said flexible film is sucked and placed in tight contact with the upper surface of the pattern plate along the periphery thereof, said pattern consisting of second communicating means adapted to communicate with at least one of said through holes and to form open ends at positions along the peripheral edge of the lower surface of said pattern, so that said flexible film is adapted to be sucked and placed in tight contact with the peripheral edge of the lower surface of said pattern by said reduced pressure.

A pattern plate device for forming vacuum sealed molds in which a flexible film is sucked to the surfaces of said pattern plate device and placed in tight contact therewith comprising a frame body having a bottom plate and an encircling side wall to form an opening above the bottom plate, a pattern plate adapted to be detachably attached to said frame body, to cover said opening and to define a hollow chamber inside said encircling side wall, said pattern plate being provided with first communicating means along the periphery of said pattern plate for communicating the upper surface of the pattern plate with said hollow chamber, a pattern provided on the upper surface of said pattern plate, and pressure reducing means disposed in said frame body and adapted to render a reduced pressure to said hollow chamber for producing a sucking action in said first communicating means, so that said flexible film is sucked and placed in tight contact with the upper surface of the pattern plate along the periphery thereof, wherein said frame body has on said bottom plate an encircled projecting wall to form another opening above said bottom plate, said projecting wall having a sealing member thereon, said pattern plate has on the lower surface thereof covering means adapted to cover the another opening formed by said projecting wall, so that a sealed hollow chamber is defined inside said encircled projecting wall, and said frame body includes second pressure reducing means adapted to render a reduced pressure to said sealed hollow chamber, so that said pattern plate is sucked and attached to said frame body.