Molded plastic screw cap having anti-backoff thread

Details Molded plastic screw cap having anti-backoff thread Molded plastic screw cap having anti-backoff thread

1996-09-25

1998-02-03

Shoap, Allan N.

Bottles and jars

Closures

Cap type

215 44, B65D 4104

Patent

active

057134790

ABSTRACT:
An anti-backoff screw cap construction for a container neck having a thread with a downwardly-facing pressure face and an upwardly-facing relief face. The cap has a depending skirt having an internal thread with an upwardly-facing pressure face for engagement with the downwardly-facing pressure face of the container neck thread. Engagement results in tightening of the cap on the container neck when the cap is turned in a screwing-on direction. The cap thread has a downwardly-facing relief face having as an anti-backoff structure, an elongate, substantially helical, resilient projecting bead which is integral with the cap thread, the bead being coextensive with an uppermost portion of its downwardly-facing relief face and being directly engageable by the upwardly-facing relief face of the container neck thread. The projecting bead is resiliently deformed by its engagement with the upwardly-facing relief face of the container neck thread when the cap is turned in its screwing-on direction. The deformed projecting bead elastically and frictionally grips the upwardly-facing relief face of the container neck thread so as to reduce the tendency for the cap to become inadvertently unscrewed from its fully screwed-on position. A highly effective retention of the cap results, without the need for complex molded locking lugs, teeth or the like.

REFERENCES:
patent: 2162880 (1939-06-01), Brown
patent: 3405831 (1968-10-01), Hudson
patent: 3682345 (1972-08-01), Baugh
patent: 3851784 (1974-12-01), Gryncewicz
patent: 4106654 (1978-08-01), Jones
patent: 4125201 (1978-11-01), Birch
patent: 4325487 (1982-04-01), Libit
patent: 4349116 (1982-09-01), Luesner
patent: 4461394 (1984-07-01), Sendel et al.
patent: 4697715 (1987-10-01), Beruvides

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