Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1977-12-23
1979-06-12
Spicer, Jr., Robert L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
425388, 264259, B29C 1704
Patent
active
041578856
ABSTRACT:
A mold construction, method and apparatus for forming backing shells for skating ring dasher boards out of a single piece of material is disclosed. The mold comprises a vacuum box and oppositely disposed forming members loosely positioned in the box to form a mold cavity. A sheet of plastic material is secured in a frame and is softened by radiant heat. The softened sheet is brought adjacent the mold cavity and is drawn into the cavity to assume the conformation thereof by air being withdrawn from the cavity through cracks therein resulting from the loosely fitting forming members. One or more layers of fiberglass and polyester resinous material applied to a face of the backing shell completes the dasher board.
REFERENCES:
patent: 2690593 (1954-10-01), Abercrombie
patent: 3025566 (1962-03-01), Kostur
patent: 3133314 (1964-05-01), Arnould et al.
patent: 3146143 (1964-08-01), Bolesky et al.
patent: 3553784 (1971-01-01), Shuman
patent: 3577593 (1971-05-01), Jackson
Baker Joseph J.
Ferguson Jr. Gerald J.
Spicer, Jr. Robert L.
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