Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Coacting shaping surfaces
Patent
1975-09-17
1977-08-23
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Coacting shaping surfaces
425400, B29C 304
Patent
active
040437361
ABSTRACT:
In a thermoforming machine for forming products from plastic sheets or the like, two shuttles or sheet-carrying frames shuttle interchangeably between a feeding station and a forming and loading station, with the shuttle which carries the sagging heated sheet passing under the oppositely moving shuttle. At opposite ends of a transverse axis at the longitudinal center of each shuttle, pivotal connections are provided to vertically looped drive chains so that the shuttle can remain right-side up as it follows the looped path of its chains. Rails are provided which support the shuttles and maintain them horizontal as they move. At the forming and loading station, snorkels engage the shuttle stopped there to provide suitable air pressure and discharge connections for operating sheet clamps by double-acting cylinders. The snorkels thrust the shuttle rearwardly against a ratchet, for accurate stop-positioning between snug side-cams.
REFERENCES:
patent: 2369840 (1945-02-01), Nalbach et al.
patent: 3081489 (1963-03-01), Jackson et al.
patent: 3538211 (1970-11-01), Adomaitis
patent: 3669594 (1972-06-01), Brown et al.
patent: 3785762 (1974-01-01), Butzko
patent: 3787158 (1974-01-01), Brown et al.
Andres, IV Philip J.
Crisler John E.
Kalmich Sol I.
Lazarus Richard B.
Plastofilm Industries Inc.
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