Snap-on screw-off closure
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United States of America Patent
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-
Oct 23, 2001
Issued Date -
N/A
app pub date -
Oct 7, 1999
filing date -
Oct 30, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a closure with a thread configuration adapted for snap-on or screw-on application to a container neck finish. The present invention preferably provides at least one annular sealing bead depending from the outer surface of the closure valve which are compressed against the inner surface of the container neck to form a seal as the closure is snapped onto the container neck. The present invention also preferably provides plurality of elevated areas extend upwardly from the tamper-evident band in spaced relation to the bottom edge of the closure body to support the tamper evident band in resisting vertical movement imparted by insertion of the closure on the bottle neck, thereby protecting the frangible elements during assembly. At least one and preferably a plurality of circumferentially spaced lugs optionally extend from the exterior wall of the container neck to facilitate breaking the frangible elements on the tamper-evident band of the closure by engaging the frangible elements as the closure is twisted off the container neck following initial snap-on application. The closure is optionally provided with at least one member attached to the tamper-indicating ring which cooperates with the arcuate projection to assist in breaking said tamper indicating ring during removal of the closure from the container neck. A second preferred embodiment of the present invention provides a threaded tamper-evident plastic closure having a tamper-evident band containing the above-described features, for use with a tamper evident push-pull resealable pour spout which is substantially leak proof. The present invention also optionally provides a dust cover which encloses the push-pull pour spout closure when inserted on the container. When the dust cover is provided with a tamper-evident sealing band, the use of a band on the lower edge of the pour spout closure for providing tamper-evidency may be eliminated.
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