Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1977-06-06
1979-02-20
Briggs, William R.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
264268, 425145, B29F 110
Patent
active
041404513
ABSTRACT:
An injection molding apparatus for forming a molded sealing ring along a peripheral region of a disk-shaped closure insert for a container. Each cavity of a plural cavity injection mold is formed to receive a disk-shaped insert to which a sealing ring is to be molded. Detection means is provided to sense the number of inserts missing from the mold, and a spring loaded pin is operative automatically to close the corresponding gate for each cavity from which an insert is missing. The detection means is operable to signal a molding compound supply means to inject into the mold only that volume of compound required for a cavity or cavities in which an insert or inserts are present.
REFERENCES:
patent: 2870479 (1959-01-01), Wickens et al.
patent: 2937404 (1960-05-01), Wickens et al.
patent: 3499396 (1970-03-01), Kaufman, Jr. et al.
patent: 3677680 (1972-07-01), Etherington
patent: 3788561 (1974-01-01), Vilagi et al.
Herdzina, Jr. Frank J.
Lasch John J.
American Can Company
Auber Robert P.
Briggs William R.
Dorman Ira S.
Hargis, III Harry W.
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