Bottles and jars – Closures – With means to facilitate closure removal
Patent
1993-09-20
1996-12-10
Cronin, Stephen K.
Bottles and jars
Closures
With means to facilitate closure removal
215305, 215328, B65D 3900
Patent
active
055823092
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a closing cap, preferably a bottle closing cap of the Crown-Cork type. These caps have already proven their good qualities with regards to cheapness, facility of handling, closing efficiency and reasonable facility of opening, and it is a well-established practice that special opening means are used for opening the caps, which means in the shape of special cap openers are a permanent part of kitchen equipment and even to a great extension of personal equipment similarly to combs, cigarette, etc. It is fully acceptable that opening the cap closed bottles by means of cap openers requires a certain force.
BACKGROUND OF THE INVENTION
However, it has previously been realized that another, simpler method of opening the caps is possible, viz. by a downwards finger pressure against the central area of the cap. This method of opening can be used when the cap is previously prepared in the simple manner that the downwardly projecting cap skirt is provided with three or more slits placed along the circumference of the cap. The skirt portions which cooperate with the bottle head will hereby appear as segments of e.g. 120.degree. or 90.degree., and if the top surface of the cap is just slightly domed, it will be obtained through the downward pressure on the central area of the cap that the individual segments are swung outwards from their engagement with the bottle neck, such that the cap is loosened from the bottle with no need for a usual cap opener.
This would be a particularly attractive opening method, but it has been observed that the slits of the cap skirt diminish the ability of the cap to resist a positive pressure in the bottle to such an extent that this technique has not been usable in practice. Most bottled products are subject to a considerable positive pressure in the production phase, and the caps should also be able to resist such positive pressure in the bottles which may occur later on, e.g. by climatic heat.
SUMMARY OF INVENTION
It is the purpose of the invention to provide a cap closure which may be opened in the said simple manner by depressing a central portion of the cap, and which may however resist such a considerable pressure in the bottle that the cap closure will be usable in practice.
The invention is based on the consideration that the curved cap skirt segments actually should be able to secure the cap despite a great inner pressure in the bottle, if the segments are in the same firm holding engagement with the bottle as the usual, unbroken cap skirts, as the round segments are still in a strong holding engagement with the upper portion of the cap. Thorough examinations have shown that the cause of the weakened holding engagement is not the segmentation as such, but rather the fact that by the mounting of the capsule and the subsequent radial constriction of its skirt for establishing the holding engagement with the bottle neck, the individual segments are not compressed peripherally sufficiently for the undulated engagement portions of the cap skirt to assume a fully efficient holding engagement with the expansion on the bottle neck. The cause hereof is that the segments, at their free end flanges facing each other, are brought to overlap slightly when the cap skirt is effected to constrict about the bottle neck.
By the invention it is an aim to achieve such a strong closing of the segmented cap that the closing is efficient in connection with such high inner pressure in the bottles that it is usable in practice in connection with bottles with positive pressure, e.g. beer bottles. According to the invention this may be realized by shaping the cap members in such a manner that the material right next to the segmenting slits is embossed to form a serrated or undulated course of the associated slit edges, such that associated, opposing slit edges are undulated in mutual counter-phase. Even though the material is thin it will hereby be obtained that the two edges of material at each slit may be pressed very strongly against each o
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patent: 1605708 (1926-11-01), Clark
patent: 1671015 (1928-05-01), Deny
patent: 1715882 (1929-06-01), Wygonik
patent: 2695720 (1954-11-01), Faccou
patent: 3269577 (1966-08-01), Stuart
patent: 3382997 (1968-05-01), Tsuji
patent: 3675805 (1972-07-01), Shane
Cronin Stephen K.
Ribi Invest ApS
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