Mold for forming a plastic article having an undercut or negativ

Details Mold for forming a plastic article having an undercut or negativ Mold for forming a plastic article having an undercut or negativ

1977-03-11

1978-07-18

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Shaping surface including means to release or remove product...

By movable mold sections

425388, 425DIG58, 249184, 425403, B29C 1704

Patent

active

041012569

ABSTRACT:
A mold for forming a plastic article having an undercut or negative draft portion adjacent a narrow wall spacing, such as a card rack, wherein the hollow projection extends outwardly from an article wall which is substantially normal to a rear wall of the article so that the projection and the rear wall are in facing relation. The mold is particularly adapted for vacuum forming an article and includes a mold member that may be heated and cooled to form and release a plastic article and a frame for holding peripheral edges of a plastic sheet in overlying relation with the mold and a heater for heating the plastic sheet for vacuum forming to the shape of the mold. The mold includes an undercut forming member resiliently and hingedly mounted on and extending outwardly from certain of mold portions so that the undercut forming members during initial separation of the mold from the formed article main mold member moves away from the undercut forming member and provides a cavity for retractive movement of said undercut forming member permitting pivoting and removal thereon as the mold is fully removed from the formed article, said undercut forming member automatically returning to molding position.

REFERENCES:
patent: 2784455 (1957-03-01), Pulaski
patent: 3642416 (1972-02-01), Muller
patent: 4030871 (1977-06-01), Cobb

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