Pressure lid container

Details Pressure lid container Pressure lid container

1992-09-28

1994-03-22

Shoap, Allan N.

Receptacles

Closures

Removable closure retained by ductile in situ deformation

220284, 220285, B65D 3900

Patent

active

052956032

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a pressure lid can or container with an at least one-part body member and a lid member, which together with the closure-side end of the body member forms a tight closure, in which a lever gap is left free between the body member and the lid member for the engagement of a lever enabling the lid member to be levered up and in which the lid member has an all-round, resilient engagement lip, which engages from the inside under pretension in a closure crease of the body member adapted to the engagement lip shape. Such a pressure lid can or container is the subject of co-pending U.S. patent application Ser. No. 865,057, the disclosure of which is incorporated herein by reference.


SUMMARY AND OBJECTS OF THE INVENTION

The the foregoing pressure lid container makes it possible in an advantageous manner to resiliently engage the lid member in the closure crease of the body member, so that the lid member can be kept under pretension in the closure crease plane, in that the engagement lip presses with spring tension into the closure crease. The essential advantage of such a closure is that such a pressure lid container can be opened easily and in non-destructive manner without using any special tool, in that by engaging a lever in the lever gap, the engagement lip is drawn radially inwards, whereas the body element is pressed outwards, so that the engagement lip is disengaged from the closure crease in the vicinity of the lever. An extremely good seal can be obtained through the engagement of the closure with high spring tension. Another important advantage is that the pressure lid container can be reused, so that it can be employed in the form of a multiuse pack.
The problem to which the present invention is directed is to the further development of the foregoing pressure lid container with a lid closure which can be levered up, so that while retaining all the aforementioned advantages, in particular, the production of the body member is simplified and the filling and closing of the container are optimized.
According to the invention this problem is solved in that, instead of the engagement lip of the cover member engaging in a separately produced closure crease, it resiliently engages below an inwardly rolled, upper circumferential edge bead of the body element.
This measure makes it possible to use the upper circumferential edge bead which is normally present on all container body members (provided that the bead is inwardly rolled) directly as the closure element for the novel pressure lid container according to U.S. patent application Ser. No. 865,057 without having to make a separate closure crease for this purpose. In addition, with such a construction, the volume of the container body member can be utilized in an optimum manner for filling purposes, because the engagement lip of the lid member engages directly on the upper circumferential edge of the body member. As is described in greater detail hereinafter, it is also possible to further optimize the container closure process.
According to a special embodiment of the invention, below the circumferential edge bead and at a distance essentially corresponding to the external diameter of the engagement lip, is provided an inwardly impressed body crease. This additional body crease makes it possible to support the lid member on the side facing the lever application point during the opening of the lid and simultaneously prevents an accidentally excessively deep pressing of the lid into the body member on closing.
Alternatively to this, below the circumferential edge bead at a distance essentially corresponding to the external diameter of the engagement lip, the body member diameter is so reduced so that there is a step offset into the interior of the body member. This embodiment has the equivalent effect to the aforementioned additional, lower body crease and is preferred if the body member is a more flat or shallow container, e.g. in the form of a dish or tray.
Preferably a sealant is provided below the circumfer

REFERENCES:
patent: 2107437 (1938-02-01), Forsyth
patent: 3912110 (1975-10-01), Hammes
patent: 3979015 (1976-09-01), Arfert

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