Bottles and jars – Closures – With separate applied fastener to hold closure in closed...
Patent
1991-05-10
1993-10-26
Shoap, Allan N.
Bottles and jars
Closures
With separate applied fastener to hold closure in closed...
215227, 215252, 215258, 215329, 215346, 215352, B65D 4104, B65D 4530, B65D 5302
Patent
active
052558053
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a screwcap for containers, particularly, the present invention relates to a screw cap for a container that has a thread, including a ring held by the screw cap and at least one projection that engages the thread of the container and which forms the "thread" of the screw cap.
Screw caps of the type described herein are used for containers, in particular for bottle, and for glass jars for liquids, pastes, or bulk material. The containers have a thread in the area of their opening or mouth, and this can also consist, for example, of short thread sections. Threads of this type are referred to as twist-off threads.
The screw caps that are intended for use with this type of container have a cap that is provided with a thread that engages with the thread on the container. The containers can be provided with, a continuous thread or with projections that form the thread. In particular, in the case of short thread sections, it is not necessary that these have a pitch. Threads of this kind that are used, for example, to close marmalade or jam jars, are also referred to as twist-off threads. In containers with twist-off threads, the cap has projections that work in conjunction with the thread sections on the container.
In the case of screw caps that are produced from material that can be deep drawn, for example, from aluminum or steel, the thread of the cap which engages with the thread on the container must be produced by deformation of the side walls of the cap. In conventional caps, the thread is frequently produced by a so-called rolling process. To this end, a cap blank without a thread is set on the already filled container and the outer wall of the screw cap is so pressed in by using a suitable apparatus that a thread that matches the thread on the container is produced in the screw cap. However, this can damage the container, in particular in the case of glass containers, as parts of the thread section can splinter off and get into the interior of the container. This can be dangerous for the user.
SUMMARY OF THE INVENTION
Thus, it is the task of the present invention to create a screw cap for a container that incorporates a thread, in which any damage to the container is avoided. In addition, the "thread" used for the screw cap should be simple and economical to produce. Furthermore, the forces necessary to open the cap should be transferred safely to the ring for a container that has a thread, including a ring held by the screw cap, said ring having at least one projection that engages the thread of the container and which forms the "thread" of the screw cap.
Because of the fact that the screw cap incorporates a ring, which in turn incorporates at least one projection that engages in the thread on the container, it is no longer necessary to provide the screw cap itself, which is to say the cap element of the screw cap, with a thread. This precludes the risk of any damage being done to the container and it becomes impossible for the user to be endangered, for example, by splinters of glass.
In a particularly preferred embodiment of the screw cap, the projection is arranged on a tab that merges into a standoff strip. This is so arranged between the cap of the screw cap and the container that is to be closed that the screw cap is properly centered. This ensures the reliable functioning of the projection of the ring "thread".
In order to make the engagement of the projections particularly reliable, in a preferred embodiment of the screw cap a standoff strip is arranged opposite a projection. This itself can incorporate a projection. In such a configuration of the screw cap forces that are so high can be ensured such that proper opening and closing of the container with the help of the screw cap is ensured.
Particularly preferred is a screw cap in which the ring is configured as a safety ring. This has at least one area which is permanently deformed or destroyed when the container is first opened. Such a safety ring ensures that the user can check whether the container has been
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Dubs Hans D.
Preuss Hans J.
Weiss Jurgen
Alcoa Deutschland GmbH
Caretto Vanessa
Shoap Allan N.
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