Plastic article or earthenware shaping or treating: apparatus – Means treating shaped work
Patent
1978-01-12
1979-10-09
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Means treating shaped work
425388, 425DIG48, 269111, B29C 2500
Patent
active
041704495
ABSTRACT:
A clamping frame for use in plastic forming apparatus which includes a plurality of tubular elements joined together to define an opening over which a sheet of plastic material is mounted with the edges of the plastic sheet being held against supporting surfaces of the tubular elements by clamps. Each tubular element is formed of a thermally conductive material and includes an interiorly disposed heating element located adjacent the supporting surfaces of the tubular element. The tubular elements include a plurality of interconnections to permit selective positioning of the tubular elements with respect to one another for varying the size of the opening defined thereby, and these interconnections also electrically connect the heating elements within the tubular elements at all adjusted positions thereof to form a closed electrical circuit which may be connected to an electrical source whereby the edges of the plastic sheet between the clamps and the tubular element supporting surfaces may be heated.
REFERENCES:
patent: 3659991 (1972-05-01), Diamond
patent: 3841819 (1974-10-01), Diamond
patent: 4018551 (1977-04-01), Shuman
patent: 4083746 (1978-04-01), Thissen
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