Static molds – Container-type molding device – And an inner removable core to form recess or opening
Patent
1974-07-08
1978-06-06
Husar, Francis S.
Static molds
Container-type molding device
And an inner removable core to form recess or opening
249177, 264313, 425DIG44, 425440, B28B 716, B28B 728, B28B 730
Patent
active
040931757
ABSTRACT:
Molding apparatus for molding articles without a seam or parting line even though the articles may have severe backdraft portions. The apparatus includes a flexible mold of relatively thick and self-supporting wall construction which is deformable by the application of fluid pressure differential to thereby release the finished article from the mold. One modification of the mold also has a thick radially extending flange which forms a seal with a vacuum pot when the mold is simply set in the pot. One modification is directed to a male and female type mold in which the outer female mold is expanded to be withdrawn from the article and the inner mold portion collapses inwardly so as to be withdrawn from the article. Another modification relates to a mold having inner portions which define an aperture or opening in the article to be molded, and which inner portions are separable from one another when the mold is expanded to thereby withdraw the inner portions from the aperture in the article and permit withdrawal of the mold.
REFERENCES:
patent: 1817545 (1931-08-01), Copeman
patent: 2218260 (1940-10-01), Forbes
patent: 2660776 (1953-12-01), Miller
patent: 3166792 (1965-01-01), Goldfarb
patent: 3480251 (1969-11-01), Pietrzak
patent: 3576930 (1971-04-01), Watters
patent: 3815863 (1974-06-01), Andeweg
Maurino William J.
Putzer Raymond M.
Brown John S.
Husar Francis S.
Nilles James E.
Precision Flexmold, Inc.
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