Snap locking device for a container with a cover

Receptacles – Closures – Removable closure retained by ductile in situ deformation

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Details

220268, B65D 4116

Patent

active

049663020

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention:
The invention concerns a snap locking device for a container with a cover, said cover being lockable to the container via a flange which is formed on the cover or the container and which may be caused to assume a loosened and a locked position, respectively, and is adapted to cooperate with a locking edge on the container or the cover, the loosening flange, which is thus bistable, being formed with substantially vertical weakened lines.
2. Discussion of the Art:
Containers of such a type are known e.g. from the French Patent Application No. 2 377 333 which concerns the principle of locking devices comprising bistable components. However, such a simple closing arrangement for packages above a certain size is not sufficient when a package is to be used for storing both high-viscous and low-viscous substances. These may be e.g. food products, such as butter, margarine, or jam, and paint, or they may be substances for use in the medical and pharmaceutical industries.
The Danish Published Application No. 145 194 describes a container/cover structure which operates with a bistable locking flange. However, this is a structure which has been found not to be stable in transport, storage and stacking. Further, the package is not provided with a seal device, which is increasingly demanded by many buyers.
The Danish Patent Application No. 3870/83 concerns a package which is formed with seal, but constructed in such a manner as to operate upon rupture of vertical wall constrictions; however, it has been found that this form of seal has a poor control function because the wall constrictions have very little information value. The information value of the seal state is particularly essential in the pharmaceutical industries, and in the other fields of use there is a tendency for more stringent demands on the opening and closing mechanism of packages.


SUMMARY OF THE INVENTION

The object of the invention is to provide a container structure which provides a hermetically tight package in an unloaded state and also when subjected to impact or pressure, and which moreover has the property in a situation of use that the cover can temporarily be protected against impacts from the surroundings and the contents.
This object is achieved by constructing a snap locking cover device which in addition to providing a hermetically tight package, this container structure also has the advantage that the pair of weakened lines, serving as a seal device for locking the cover to the container, is provided so that the flange portion disposed between them is integral with the stationary flange portion, so that the resulting, relatively rigid edge face serves as snap locking means in which the flange may be pivoted to snap the cover onto the container. When provided with an increased radial wall thickness said flange portion will have an increased rigidity so that the snap locking effect is improved. This snap locking device is used in connection with temporary closure of the container, which is thus kept tight in case of shock impacts and possible overturning.
Further, when the snap locking means on the cover is formed with radial wall reinforcements and incorporates an additional seal means, the visual impression of the container as a so-called pilfer-proof structure is improved.
In a preferred embodiment, the cover is provided with two snap locking devices so that two pairs of weakened lines are present, each of which extends over a relatively small part of the circumference of the cover and is disposed diametrically opposite each other. This entails that each of the cover circumference parts disposed between the snap locking devices extends through a circular arc of below 180.degree., and this discontinuity of the circumference causes the ring tension of the cover to be reduced, which contributes to easy upward and downward movement of the locking flange; moreover, opening of the container according to the invention will not result in part of the contents being ejected because of the

REFERENCES:
patent: 4165018 (1979-08-01), Giggard
patent: 4279358 (1981-07-01), Jacobs
patent: 4418833 (1983-12-01), Landis
patent: 4431113 (1984-02-01), Sims, Jr.
patent: 4444332 (1984-04-01), Widen et al.
patent: 4577756 (1986-03-01), Hennessy et al.
patent: 4721210 (1988-01-01), Lawrence et al.

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