Apparatus for injection molding a tamper-proof plastic cap

Details Apparatus for injection molding a tamper-proof plastic cap Apparatus for injection molding a tamper-proof plastic cap

1975-02-07

1976-02-24

Flint, Jr., J. Howard

Static molds

Including means to apply force to remove or release product...

Pin or sleeve means

249 59, 249 74, 425438, 425443, B29F 114

Patent

active

039401030

ABSTRACT:
This invention relates to a plastic closure or cap-type stopper of which the outer skirt has formed on its inner surface a plurality of ribs adapted to engage the top ring and the grooves of the neck of the container to be stopped, on either side of a partially tearable guaranty strip bounded by circular thinning grooves formed in the inner surface of the skirt.
The mold for manufacturing this closure comprises underneath a fixed plate formed with holes for the passage of the ejection ring and ejection shaped sleeve of a sliding plate perforated like the fixed plate and actuated by a pusher, and above a sliding impression plate of which the perforation corresponding to the preceding ones bounds the injection chamber for the closure skirt on the core, said sliding impression plate being actuated by a pusher for releasing the closure from the mold impression at the end of its stroke.

REFERENCES:
patent: 2583093 (1952-01-01), Emmert et al.
patent: 2799049 (1957-07-01), Wilson
patent: 2860374 (1958-11-01), Harrison et al.
patent: 3125801 (1964-03-01), Fields
patent: 3482814 (1969-12-01), Hedgewick
patent: 3555606 (1971-01-01), Hedgewick
patent: 3660001 (1972-05-01), Roehr
patent: 3853451 (1974-12-01), Bendzick

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