Plastic article or earthenware shaping or treating: apparatus – Press forming apparatus having opposed press members
Patent
1975-06-05
1976-08-17
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Press forming apparatus having opposed press members
425141, 425394, 425411, B29C 1700, B30B 116, B30B 928, B30B 1514
Patent
active
039751325
ABSTRACT:
In the application of working pressures, devices are used of the type having at least two members by which the working pressure is applied and a connection between them operable to vary the relationship of one of them relative to the work. Each connection includes first parts with the first part rotatably carried by the one member. Each part has an eccentric portion of a circular section with that of the first part rotatable within the eccentric portion of the second part and the second part is rotatably carried by the other pressure-applying member. Adjusting means are provided to turn the parts equally but oppositely with the members operatively connected and with the axis of the eccentric portion of the second part always in the plane of a predetermined line of force inclusive of the axis of the first part. The devices are shown as the toggle joints operable by means responsive to fluid under pressure to move one of the platens of the forming station of a thermoformer in opening and closing the molds, said station also desirably having means to assist in the reciprocation of the platens with the toggle joints desirably having an acute angular relationship when the molds are open. The adjusting means desirably but not necessarily includes a servo motor controlled by a gauge continuously monitoring the thickness of the sheet material being advanced through the thermoformer.
REFERENCES:
patent: 1333648 (1920-03-01), Wennberg
patent: 2624915 (1953-01-01), Corson
patent: 3504074 (1970-03-01), Snow
patent: 3543344 (1970-12-01), Hunt
patent: 3632250 (1972-01-01), Snow
patent: 3687586 (1972-08-01), Hara et al.
patent: 3816052 (1974-06-01), Schoppee et al.
Flint, Jr. J. Howard
United Industrial Syndicate, Inc.
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