Method of forming tamper evident closures

Details Method of forming tamper evident closures Method of forming tamper evident closures

1984-08-07

1985-10-15

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Bending or twisting of work

264310, 264318, B29C 1702

Patent

active

045473323

ABSTRACT:
The method of forming a tamper-evident closure having a threaded cap and a tamper-evident ring removably connected to each other by break-away tabs. The method includes the steps of molding the threaded cap and tamper-evident ring as an integral unit in a side-by-side relationship to each other and with the break-away tabs integrally connecting them. A retaining lug is also molded on the ring and has a substantially inwardly directed surface. An outwardly directed shelf and cam means are also molded on the cap. After the molding operation, the integrally molded part is removed from its mold and the tamper-evident ring and the threaded cap are moved relative to each other with the break-away tabs acting as a hinge to enable the cap and tamper-evident ring to be brought into substantial vertical alignment with each other while the inwardly directed surface of the retaining lug is snapped over the shelf to hold the cap and ring in alignment. The closure can then be secured onto a cooperating container so that the rotation of the cap to remove it causes the surface means to cause the cap to rotate with respect to the tamper-evident ring so that the tabs break and the ring remains on the container but unsecured to the cap, thereby providing evidence of the opening of the closure.

REFERENCES:
patent: 4022352 (1977-05-01), Pehr
patent: 4042105 (1977-08-01), Taylor
patent: 4340352 (1982-07-01), Hayberg

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