Bottles and jars – Closures – Frangible member or portion
Patent
1998-02-23
2000-09-12
Cronin, Stephen K.
Bottles and jars
Closures
Frangible member or portion
215275, 215305, B65D 3900
Patent
active
061164445
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a plastic closure cap according to the preamble to claim 1. These types of closure caps are mainly used for the closure of containers, and in particular of bottles with liquid contents.
2. Description of Related Art
If the closure cap is used on containers with beverages containing carbon dioxide, the closure cap must under certain conditions also remain reliably in contact with the container mouth under considerable gas pressure. For this reason, retaining means are anticipated on the countainer mouth and on the inner side of the closure cap by which means the closure cap can engage with the container mouth. As a result, however, intentional manual removal of the closure cap will also be hindered. In order to solve this problem, various suggestions are known.
For example, CH-PS-529 022 shows a plastic closure cap provided with a strap engaging around the outer wall, by which means the closure cap can be withdrawn from the container mouth under the exertion of force.
CH-PS-553 696 shows a closure cap which, on its casing, is provided with a press lug and frangible points. The closure cap can be removed by means of depressing the press lug. Through the extertion of pressure on the press lug, the frangible points will sever, permitting the retention element to be overcome more easily. Apart from that, severed frangible points will reveal unauthorized opening of the container.
DE-DO-1 782 059 shows a plastic closure cap which is provided with a pull-off ring and integrated zones of weakness on the cap casing. If, in order to open the closure, a force is applied to the pull-off ring, the said zones of weakness will break, by which means opening of the closure cap will be facilitated. The closure cap retaining elements possess additional sections of less thickness and if necessary also perforations, in order to impart increased flexibility to the cap.
However, all these closure caps suffer various disadvantages: either considerable force will still be required in order to open the cap, or the closure is so elastic that it can easily be ejected from the container mouth by the internal pressure. On the one hand, with solutions that recommend press elements or press lugs, the disadvantage is that only a relatively short lever arm can be created; on the other hand, the zones of weakness on the lower skirt edge are restricted, so that breaking of these zones of weakness will not facilitate opening to any degree.
The object of the invention is thus to avoid the disadvantages of the state of the art, and therefore in particular to create a plastic closure cap for beverages containing C0.sub.2 which can be removed from the container mouth with the least possible application of force. In addition, the closure cap shall also display initial opening of the container.
BRIEF SUMMARY OF THE INVENTION
According to the invention, this object is primarily fulfilled according to the characterizing section of claim 1.
The closure cap possesses a cap base and a cylindrical wall connected to said base. A retaining bead is provided on the inside of the cylindrical wall, said retaining bead being able to be brought into engagement with the retaining elements in the area of the container mouth. In order to open the closure cap, a pull-off ring is provided, said ring being connected to the edge area of the wall at at least one, preferably however two connecting points, said edge area being able to be placed upon the container opening. The pull-off ring runs concentrically to and surrounds the wall, and can be continuous or also open ended. In order to facilitate the opening procedure of the closure cap, the wall is provided with frangible lines. These frangible lines run vertically from the edge area of the wall upwards towards the closure base, and are arranged adjacently to the connecting points between the pull-off ring and the wall.
In order to open the closure cap, the pull-off ring is bent upwards and, with a pull of the finger, a force is exerted on
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patent: 4534481 (1985-08-01), Summers et al.
Bosl Udo
Kirchgessner Michael
Cronin Stephen K.
Crown Cork AG
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