Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1976-06-23
1977-06-21
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
425403, 425438, 249184, 425DIG58, B29C 1704
Patent
active
040308715
ABSTRACT:
An apparatus for molding plastic sheet and the like by a thermoforming process, wherein an overhanging hollow portion is formed in the molded sheet by a retractable mold portion having a plurality of resiliently connected elements which may be moved relative to each other as the mold portion is withdrawn from the overhanging, formed sheet portion. In the illustrated embodiment, a plurality of spring means are provided for providing different positioning functions in arranging the movable mold portion in the desired configuration.
REFERENCES:
patent: 994643 (1911-06-01), Johnson
patent: 2784455 (1957-03-01), Pulaski
patent: 3126582 (1964-03-01), Scott
patent: 3237913 (1966-03-01), Sellers
patent: 3279739 (1966-10-01), Long
patent: 3302245 (1967-02-01), Scott
patent: 3467741 (1969-09-01), Kesling
patent: 3577593 (1971-04-01), Jackson
Flint, Jr. J. Howard
Whirlpool Corporation
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