Apparatus for forming a pilfer proof container closure

Details Apparatus for forming a pilfer proof container closure Apparatus for forming a pilfer proof container closure

1985-11-27

1987-06-16

Hoag, Willard E.

Static molds

Container-type molding device

And an inner removable core to form recess or opening

249175, 425577, 425436R, 425438, 425441, B29C 4526, B29C 4544

Patent

active

046731580

ABSTRACT:
Apparatus for forming a plastic pilfer-proof cap that comprises a ring, a plurality of inwardly directed hooks joined to one edge of the ring by hinge portions, and a weakened region is integrally molded with a main closure portion comprising a closed end and a skirt extending from the closed end and having an edge to which the pilfer-proof is attached during the molding. The hooks define sectors of a generally frusto-conical shell and extend inwardly and upwardly toward the closed end from the remote end of the ring. The hooks are released from the mold by rotating a mold portion that forms the respective hidden surfaces of the hooks and by pivoting the hooks radially outwardly toward the respective parts of the inner surface of the ring with respect to which the hidden surfaces are juxtaposed.

REFERENCES:
patent: 2921343 (1960-01-01), Mumford
patent: 3344942 (1967-10-01), Hedgewick
patent: 3737277 (1973-06-01), Uhlig
patent: 4044092 (1977-08-01), Spears
patent: 4155698 (1979-05-01), Aichinger
patent: 4496302 (1985-01-01), Brown
patent: 4502660 (1985-03-01), Luther et al.
patent: 4519569 (1985-05-01), Nolan
patent: 4521367 (1985-06-01), Underwood
patent: 4533312 (1985-08-01), Von Holdt
patent: 4552328 (1985-11-01), Dutt et al.

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