Bottles and jars – Closures – With pressure-responsive seal
Patent
1995-10-30
1998-04-28
Cronin, Stephen
Bottles and jars
Closures
With pressure-responsive seal
215344, 215350, B65D 5300
Patent
active
057434204
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a plastic closure for closing a mouth region of a container, with a cover allocated to the container mouth, an annular side wall proceeding from the cover and connected thereto, as well as a sealing arrangement closing the container.
BACKGROUND
Plastic closures of the type here addressed, in particular for the closing of bottles, are known. They have the disadvantage that they cannot always ensure the secure closing of a container.
It is an object of the invention, therefore, to provide a plastic closure that ensures a secured closing of a container.
SUMMARY OF THE INVENTION
This problem is solved in the case of a plastic closure of the type mentioned at the outset with the aid of the features listed in claim 1. The closure is distinguished, accordingly, in that the sealing arrangement has a pivotable sealing lip which projects from a support. In the closing of the container the sealing lip is swung out of a rest position into a sealing position, in which it is clamped between the support and the side wall of the container so that it is subjected to a compression. By the compressive forces arising there the sealing lip is pressed firmly against a side wall of the container, so that there is ensured a tight closure even with an excess pressure in the container. By reason of the pivotability of the sealing lip, the latter, however, can execute a yielding movement: With an especially high excess pressure in the interior of the container the sealing lip is swung back in the direction of its rest position, in which the container is no longer closed, so that the excess pressure can be dissipated.
In a preferred example of execution, the sealing lip springs over a distance to the cover from the inner surface of the side wall, which then, as it were, forms the support of the sealing lip. Such a closure can be produced especially simply and economically, because the formation of a separate support can be omitted.
In a further preferred embodiment of the plastic closure the sealing lip is provided with an operating arrangement which arises at the end of the sealing lip which lies opposite the support. The pivotal movement of the sealing lip is supported by the operating arrangement in the closing of the container. By such a construction dimensional tolerances between closure and container can be compensated for especially well. If, therefore, a closure with especially great inside diameter is emplaced on a container with especially small outside diameter, at least the operating arrangement still enters into engagement with the mouth region, respectively the side wall of the container, so that the sealing lip is swung in the closing of the container and brought into its sealing position. In the equipping of the sealing lip with an operating arrangement the sealing lip can be clamped and compressed between its support and the operating arrangement, so that the sealing effect is therewith achieved.
There is preferred an embodiment of the closure as a surrounding flange in which the operating arrangement formed of the sealing lip, after the emplacement of the closure, is bent over regionally on the container and lies flush against the side wall of the container. In this manner the sealing effect of the sealing arrangement is increased with rising internal pressure of the container. If the internal pressure of the container exceeds a certain measure, then the sealing lip with the flange can yield following the pressure, possibly even flip over. At any rate the interior of the container is freed and a venting is brought about so that a bursting of the container can be excluded with certainty. The venting pressure of the closure can be varied by the length of the sealing lip, respectively of the bent-over region of the flange.
A further embodiment of the closure is preferred for the reason that its sealing arrangement has at least one press-on web which presses the flange of the sealing lip in the closed state of the container against its side wall. In this manner there is en
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patent: 5285913 (1994-02-01), Morton
patent: 5423444 (1995-06-01), Druitt
Loffler Manfred
Preuss Hans-Joachim
Alcoa Deutschland GmbH
Cronin Stephen
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