Bottles and jars – Closures – Frangible member or portion
Patent
1988-09-13
1990-04-03
Norton, Donald F.
Bottles and jars
Closures
Frangible member or portion
B65D 4134
Patent
active
049133004
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a closure for containers, having a guarantee ring on its lower side which is provided on its interior wall with hook-like protrusions that extend inwardly and upwardly and engage the container when the closure is removed, effecting in this manner a separation of the guarantee ring from the body of the closure.
These protrusions or hooks are below the mouth of the closure when the closure is mounted. As a rule said mouth has a larger diameter than the adjacent neck of the container. The free ends or tips of these hooks are at such a distance from the longitudinal axis of the container and thus also of the closure that this distance is inferior to the radius of said container mouth. When the closure is removed, the hooks therefore engage the lower side of the container mouth. The guarantee ring, linked to the closure body by means of thin bridge-like strips, thus becomes separated from the latter. The first opening of the closure is therefore indicated.
Hooks of this kind are known from the prior art, e.g. from U.S. Pat. No. 4 488 655. The hooks are formed as individual protrusions spread over the periphery. An annular hook, i.e. a hook extending over the entire periphery, has also been proposed. Both the upper and the lower side of the hooks have a distinctive inclination with regard to the interior wall of the guarantee ring from which they protrude. The angle of inclination is rather wide, as a rule between 50 and 60 degrees. However, the upper side may even have a still wider angle, up to 90 degrees.
Besides hooks of this shape, others have been proposed which protrude not obliquely in an axially upward direction but horizontally from the interior wall. They have so to say a smaller radius than one of the interior wall. Their resistance against the removal of the closure, however, is lower as on the hooks extending obliquely upwards so that they were not successful. Above all there aue problems arising with them during the placing of the closures onto the containers. The hooks must namely slip over the container mouth which has a larger diameter, and they are required to snugly lie against the interior wall of the guarantee ring. Only after having reached the thinner neck of the container, they can resume their original position in which they protrude again from the interior wall. It is obvious that the wedge-like hooks extending obliquely in an upward direction are better than the embodiments previously referred to.
However, even with the oblique hooks just mentioned, problems arise in daily use when the closure is mounted. The container filling machines, in particular those used in the beverage industry, are laid out for such extreme high hourly ratings that only very little time is allowed for mounting the closure. Within this brief period the closure is required to slip over the container mouth and the guarantee ring, having a smaller diameter but meeting the container mouth first during mounting, must widen itself elastically. The thin strips connecting the guarantee ring with the closure body are in fact required to push the guarantee ring in front of them without becoming damaged.
Experience has shown that the present hooks obstruct or block the mounting procedure of the closure. Obviously they were inclined too much with regard to the direction of the mounting movement and thus acted like rigid obstacles. An elastic widening within the brief period just mentioned was not possible or, at the most, in an insufficient manner. The guarantee rings therefore piled up at the container mouths which led to the upsetting of the connecting strips. The closures could no longer be mounted because their space was taken up by the guarantee rings which had not slipped over the container mouths. Troubles during the filling process were the result of it. Other troubles, too, could occur such as e.g. a bursting of guarantee rings.
It is an object of the invention to avoid these difficulties, which utterly hamper the filling procedure, by providing a closure whose characteristic features app
REFERENCES:
patent: 4322012 (1982-03-01), Conti
patent: 4488655 (1984-12-01), Itsubo et al.
patent: 4511054 (1985-04-01), Shank
patent: 4526282 (1985-07-01), Dutt
patent: 4530436 (1985-07-01), Wiedmer
patent: 4667838 (1987-05-01), Yeager
Wiedmer Ernst
Wiedmer Walter
Norton Donald F.
Walter Wiedmar AG Plastikform
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