Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including both heating and cooling means
Patent
1992-04-03
1995-04-25
Vargot, Mathieu D.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including both heating and cooling means
425403, 425808, B29C 5118, B29C 5142
Patent
active
054093694
ABSTRACT:
An apparatus and method for making a wide angle light diffusing lens of the type which includes a peripherally extending lip for supporting the lens in a downwardly opening light fixture. The lens includes a downwardly and inwardly converging light translucent side walls as well as downwardly and inwardly extending end walls and which are connected together. These walls effectively form a prismatically shaped lens which permits dispersion of light from planes at a wide angle. The apparatus of the invention includes a form or mold having an upwardly extending rib on its upper surface which generally defines a lower edge of the lens and aids in defining the other edges of the prismatically shaped lens. A plastic sheet as, for example, an acrylic plastic sheet, is heated to a temperature where it softens and is somewhat flowable, moldable and bendable and which is then draped over the rib on the mold. A mold top is then disposed over the mold encapsulating the plastic sheet therein. When the sheet is cooled, it will assume the form of the wide angle light diffusing lens.
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patent: 4115486 (1978-09-01), Cowman, Jr. et al.
Malcolite Corporation
Schaap Robert J.
Vargot Mathieu D.
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