Flexible mold having internal seams

Details Flexible mold having internal seams Flexible mold having internal seams

1975-04-28

1976-12-21

Shore, Ronald J.

Static molds

Container-type molding device

249127, 264313, 264334, 425440, 425DIG44, B28B 706, B28B 720

Patent

active

039984222

ABSTRACT:
Molding apparatus for molding articles which are free of seams and parting lines even though the articles may have severe backdraft portions. The apparatus includes a one-piece distensible flexible mold of relatively thick and self-supporting wall construction which is deformable by fluid pressure in order to release the molded article. The flexible walls of the mold include internal slits extending from the mold cavity and partially through the walls for facilitating increased expansion of the mold. The ends of the slits include transversely extending slits in order to prevent tearing of the mold wall at the end of the slit and to further facilitate expansion of the mold.

REFERENCES:
patent: 1551603 (1925-09-01), Melosi et al.
patent: 1983602 (1934-12-01), Daubenmeyer
patent: 3776683 (1973-12-01), Putzer et al.
patent: 3937438 (1976-02-01), Fox et al.

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