Tamper-evident cap

Details Tamper-evident cap Tamper-evident cap

1989-09-14

1991-02-19

Marcus, Stephen

Bottles and jars

Closures

Frangible member or portion

215256, B65D 4134

Patent

active

049935712

ABSTRACT:
An improved plastic tamper-evident cap is molded on an internal mold member. The cap is adapted for use with a container having a threaded neck portion at a radially inwardly extending shoulder disposed below the threaded neck portion and facing axially away therefrom. The cap has a top wall, a depending skirt with an internal threading for engagement with the threaded neck portion of the container and a tamper-evident ring connected to the lower end of the skirt by frangible means. The tamper-evident ring has radially inwardly extending locking means adapted to slide over the shoulder. The improvement comprises a trapazoidal frangible member having a narrow top and a wide base. The top adjoins the skirt of the cap at sharp corners. The frangible member has curved adjoining portions between the frangible member at its base and the tamper-evident ring.

REFERENCES:
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patent: 3329295 (1967-07-01), Fields
patent: 3455478 (1969-07-01), Fields et al.
patent: 3463341 (1969-08-01), Fields
patent: 4345692 (1982-08-01), Obrist et al.
patent: 4352436 (1982-10-01), Chartier et al.
patent: 4452363 (1984-06-01), Davis
patent: 4461390 (1984-07-01), Csasar
patent: 4555039 (1985-11-01), Conti
patent: 4664278 (1987-05-01), Barriac
patent: 4667836 (1987-05-01), McLaren
patent: 4715506 (1987-12-01), McLaren
patent: 4744480 (1988-05-01), Luch et al.
patent: 4878589 (1989-11-01), Webster et al.

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