Receptacles – Closures – Superposed closures for common opening
Patent
1982-08-23
1984-06-12
Hall, George T.
Receptacles
Closures
Superposed closures for common opening
220270, 220306, 220307, B65D 5122
Patent
active
044536461
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a jug shaped container of thermoplastic material, as used as a sales packing e.g. for paint or for foodstuff products in a dressing, the container having a lid of substantial diameter and secured to the container by snap lock action between complementary holding means along the edge of the lid and the top edge of the container, respectively. With the conventional jug designs the holding effect on the lid shall have to be a compromize between a safe closure which is resistant against an internal overpressure as caused e.g. by impacts during shipping and handling and a closure which is reasonably easy to open, and generally, in practice, it is the closing safety which is hereby compromized. An internal overpressure does not necessarily cause the lid to be forced off the jug, but a leakage may occur at one or more places along the edge.
The container according to the invention is based on the idea that the lid is caused to be held with such a firm locking that it will resist a considerable internal overpressure in a fully sealed manner, while an easy opening of the lid is secured by a tear up arrangement preferably based on weakened rupture lines in the lid inside the edge portion thereof. In a preferred embodiment of the invention the tear up arrangement includes the entire lid portion inside a narrow rim as locked to the top edge of the jug, such that the jug is opened to the full internal mouth diameter thereof, with the said rim portion of the lid being left permanently on the jug edge apparently as a fully integral part thereof. When the rim portion is thus left as a part simply constituting the uppermost portion of the side wall of the open jug, then the interacting snap locking means may be designed solely from an efficiency point of view or rather from any point of view but the appearance of the interacting surfaces themselves, since these will remain hidden and without functional or other importance in the opened jug.
It may be desirable to reclose the jug in a less firmly sealed manner upon the first opening thereof, and to this end the closed jug may be provided with a separate top lid which is fairly easy to remove from the jug and to replace on the opened jug. According to the invention it is of special advantage if the reclosing lid is mounted in holding engagement with the said rim portion of the first mentioned sealing lid, because the two lids may then in an industrial jug filling and closing station be applied to the jug as a single preassembled unit.
When the sealing lid itself shall not be adapted so as to be manually remountable on the jug it will be practically possible to design the interacting snap locking means of the lid and the jug in such a manner that the mounting of the sealing lid shall require a pressing force higher than normally expectable by a manual closing; such an increased pressing force is readily available in connection with the use of automatic handling equipment in the industrial filling and closing plant, and an important consequence is that a very firm and highly sealed snap lock engagement is achievable by means of a snap lock arrangement which requires a very short mutual locking movement between the lid and the jug. The shortness of this relative movement, as explained in more detail below, will involve a possibility of closing a liquid filled jug with only a neglectible amount of air remaining therein, this being of importance for many kinds of products to be sold in jugs of the type in question.
As will also be explained in more detail below, the said possibility of shaping the interacting snap locking means without any special attention to the appearance of the locking means individually will equally account for advantages with respect to the achievement of a closure which is resistant against an excessive internal overpressure in the closed jug, because respective portions of the rim of the lid and the top edge of the jug may be designed to support each other for counteracting a cross sectional tilting and loosening of the sn
REFERENCES:
patent: 3300081 (1967-01-01), Muhlhoff
patent: 3434620 (1969-03-01), Lavrizio
Hall George T.
Nigu-Pack A/S
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