Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1979-02-16
1981-07-14
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...
425DIG48, 425394, B29C 1700
Patent
active
042784140
ABSTRACT:
Apparatus for making skylights from thin polymer sheets. Heated clamp frames are provided for clamping the perimeter of a thin polymer sheet and preheating the perimeter thereof to a preselected first temperature. An oven is provided for further heating the preheated perimeter and for heating the center portion of the polymer sheet to a selected second temperature greater than the first temperature to soften the polymer for forming. Upper and lower perimeter platens are provided having a plurality of stepped edges therein which are clamped onto the softened polymer sheet to thereby form a plurality of steps within the perimeter of the polymer sheet. A vacuum forming chamber is provided for forming a dome in the center portion of the polymer sheet above the stepped portion thereof. A push member may also be provided adjacent the upper platen for forming a sharp rise or push around the perimeter of the dome and between the steps and the dome.
REFERENCES:
patent: Re27435 (1972-07-01), Shelby
patent: 2784455 (1957-03-01), Pulaski
patent: 2952875 (1960-09-01), Herrick
patent: 3025566 (1962-03-01), Kostur
patent: 3118182 (1964-01-01), De Muth
patent: 3238566 (1966-03-01), Koehler
patent: 3256375 (1966-06-01), Bolelli
patent: 3516122 (1970-06-01), Schwartz
patent: 3551954 (1971-01-01), Knowles
patent: 3599959 (1971-08-01), Asenbauer
patent: 3703255 (1972-11-01), Wode
patent: 3953273 (1976-04-01), Faller
patent: 4025275 (1977-05-01), Gournelle
patent: 4097035 (1978-06-01), Shuman
patent: 4127328 (1978-11-01), Mendors
patent: 4143587 (1979-03-01), Fuji
Walls, Jr. Lester L.
Weisner Kent A.
Flint, Jr. J. Howard
Kennedy Sky-Lites, Inc.
Wiggins Macdonald J.
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