Plastic article or earthenware shaping or treating: apparatus – With indicator – signal – recorder – illuminator – or inspection... – Means permitting visual inspection by operator
Patent
1977-08-01
1979-06-12
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
With indicator, signal, recorder, illuminator, or inspection...
Means permitting visual inspection by operator
425388, B29C 1704
Patent
active
041578848
ABSTRACT:
A vacuum molding apparatus of simplified construction utilizing a vacuum cleaner as a vacuum source. The molding apparatus includes a tray with upstanding side walls having upper outturned flanges for mounting a pair of horizontally positioned holder frames which clamp a sheet of thermoplastic material therebetween directly above a highly reflective, bottom surface of the tray which upon being heated uniformly heats the plastic sheet mounted parallel thereabove.
The holder frames together with the sheet are manually transported and placed over a male mold pattern on a vacuum frame which comprises an air-tight box having a forominous top plate through which air is drawn beneath the heated plastic sheet which is draped over the plate, and the mold pattern thus forming the sheet about the mold pattern. The box has a vacuum chamber co-extensive with the perforated top plate which is connected to one end of a vacuum hose.
REFERENCES:
patent: 3072964 (1963-01-01), Tilden
patent: 3190945 (1965-06-01), Diamond
patent: 3207821 (1965-09-01), Jones-Hinton et al.
patent: 3307222 (1967-03-01), Baldwin et al.
patent: 3841819 (1974-10-01), Diamond
Popular Mechanics, Dec. 1961, pp. 174-177.
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