Bottles and jars – Neck – Structure to receive a particular closure
Patent
1998-11-06
1999-12-28
Cronin, Stephen K.
Bottles and jars
Neck
Structure to receive a particular closure
215252, 215307, 215329, 215330, 220288, B65D 728
Patent
active
060069309
DESCRIPTION:
BRIEF SUMMARY
U.S. Pat. No. 5,462,186 discloses a closure having two threads which are circumferentially displaced at 180.degree. with respect to each other and having venting slots intersecting the threads. Each thread extends over more than 360.degree., such that in circumferential direction there are always disposed at least two threads.
This invention concerns a container finish and a closure cap with a twin-start thread according to the preamble to the independent patent claims.
Various closure arrangements with multi-start threads on the closure and the container finish are state of the art. U.S. Pat. No. 4,770, 306, for example, discloses a closure that possesses a twin-start thread. Each thread extends over an angle of approximately 180.degree., and both threads are displaced so as to be diametrically opposite each other. An advantage of such twin- or multi-start threads is that the engagement between the threads of the closure and of the neck of the container is greater when compared with single-start threads. This enables the provision of shorter threads, resulting in a considerably shorter opening or closing travel of the closure.
In the case of containers that are filled with beverages containing carbon dioxide, the internal pressure will be raised when such a container is in the closed condition. On opening the container, sudden ejection of the closure due to the raised internal pressure should be avoided before the internal pressure is reduced. Such ejection is accompanied by a risk of injury to the consumer.
Also in the case of containers or closures provided with means to vent the closure on unscrewing, there are certain risks associated with misuse by the consumer. It is conceivable that, despite generally sufficient venting arrangements, due to intentionally rapid unscrewing, closures of containers containing carbon dioxide can be removed so rapidly that venting time is too short. The high-speed ejection of closures in the manner of a projectile can be intentionally induced in this way.
The purpose of the invention is to avoid the drawbacks of the state of the art, and in particular to create a container finish and a closure cap with a multi-start thread which possesses improved venting properties for reduction of the internal pressure during the opening sequence of containers containing beverages with a carbon dioxide content.
A further purpose of the present invention is to create a container finish and a closure cap which prevent the induction of excessively rapid unscrewing by the user, and ejection of the closure.
A further purpose of the present invention is to create a closure and a container finish which can be economically manufactured, in particular which require a small amount of material and, when in the closed condition, are reliably engaged with each other.
According to the invention, these purposes are fulfilled with a closure and with a container finish according to the characterizing portion of the independent patent claims.
A container finish possesses in principle a cylindrical outer surface on which two outwardly protruding threads are arranged, displaced by 180.degree.. During opening, such an arrangement, displaced by 180.degree., prevents tilting or one-sided opening of the closure, and its ejection from the finish. The distribution of the force exerted from the container finish onto a closure is, with such an arrangement, point-symmetrical and diagonally opposed so that the risk of premature and one-sided ejection is reduced.
The threads are interrupted by venting recesses. During the opening sequence, the venting recesses permit reduction of a raised internal pressure within the container at a time when a closure is still firmly engaged with the container finish.
Each thread preferably extends over an angle of 240.degree. to less than 360.degree., preferably to 340.degree.. The selection of such an angular range will, in combination with a suitable selection of venting recesses, result in optimum venting behavior, as well as a secure interlock and force fit between the finish a
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Dreyer Lino
Jauslin Richard
Cronin Stephen K.
Crown Cork AG
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