Apparatus for air-pressure forming thermoplastic resin sheets

Details Apparatus for air-pressure forming thermoplastic resin sheets Apparatus for air-pressure forming thermoplastic resin sheets

1975-07-29

1977-11-08

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including shaping means comprising fluid pressure contacting...

264 93, B29C 1704

Patent

active

040573826

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.

REFERENCES:
patent: 910735 (1909-01-01), Sill
patent: 1963013 (1934-06-01), Breth
patent: 2850966 (1958-09-01), Dohm, Jr.
patent: 3740182 (1973-06-01), Wunning
patent: 3933562 (1976-01-01), Cruckshank et al.

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