Receptacles – Closures – Closure adaptable for various sizes or openings
Patent
1996-01-04
1998-02-24
Shoap, Allan N.
Receptacles
Closures
Closure adaptable for various sizes or openings
215319, 220717, 220718, 222570, B65D 2100
Patent
active
057204080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a sealing cap for cans of various diameters provided with an edge beading, whose lid contains a tear tab for forming a pouring opening, comprising a plate-shaped basic body made of plastic, which spans over the lid and extends under the edge beading with at least one oppositely arranged, elastic front edge web in a snap closure-like manner, wherein the elastic front edge web is radially displaceable in a sliding guide of the basic body, and wherein a ring seal surrounding the pouring opening of the lid can be clamped between the basic body and the lid.
BACKGROUND OF THE INVENTION
Sealing caps of this class have been known from DE-OS 34 25 920. A sliding guide, in which a complicated plastic sliding piece is movable, is located on the underside of a plate-shaped basic body extending over the can. A compression spring, which has the task of pressing the sliding element against the edge of the can, is clamped between the sliding piece and an edge area of the basic body. The sliding piece has two elastic legs, at whose ends facing the can a lug extending under the edge beading of the can is provided. To make it possible to detach the sealing cap from the can, the elastic legs must be pressed inward against each other to enable the lugs to become detached from the edge beading. Such an arrangement is complicated in terms of manufacturing technology, its assembly is complicated, and it is expensive, aside from the fact that the basic body can be guided only insufficiently in the basic body, and the compression spring is particularly susceptible to the deposition of contamination.
SUMMARY AND OBJECTS OF THE INVENTION
The basic object of the present invention is therefore to substantially simplify the above-mentioned prior-art sealing cap in terms of the design of the elastic front edge web, to make it less expensive, and to avoid the above-mentioned disadvantages.
Based on DE-OS 34 25 920, this object is accomplished according to the present invention by the elastic front edge web being designed as an intrinsically elastic spring element having a loop-shaped bulge, one loop web of which spring element is supported on the basic body and whose other loop web passes over into a gripping element with the elastic front edge web located thereon.
The advantages of this arrangement are that the spring element can be designed in one piece and that it generates a sufficiently strong intrinsic spring force as a consequence of the loop-shaped bulge, and therefore it can be manufactured at a low cost and can be assembled in a particularly simple manner. Better guiding can also be achieved on the underside of the basic body as a consequence of this design of the spring element.
Advantageous embodiments of the sealing cap according to the present invention are disclosed. The spring element preferably consists essentially of a rectangular cross section. A special design of the gripping element is also described. This gripping element is of particular significance for the attachment of the sealing cap to cans of various diameters and for the detachment of the sealing cap from the can, because when the gripping element is designed as a wedge-shaped thickening, it forms an oblique slide-up surface, which causes a displacement of the spring element against the spring force and the spring element to snap in during the attachment of the sealing cap to a can edge. On the other hand, this wedge-shaped thickening of the gripping element offers the possibility of retracting the spring element when the sealing cap is to be detached from the can, because the wedge-shaped thickening forms an acceptable surface for the finger to act upon.
The embodiment according to which the loop-like bulge extends at right angles to the plane of the plate-shaped basic body, is recommended to ensure that the spring element according to the present invention can exert a sufficient spring action. This means that the bulge comes to lie under the basic body. Therefore, it does not interfere with the
REFERENCES:
patent: 4387826 (1983-06-01), Heubl
patent: 4511057 (1985-04-01), Tontarelli
patent: 4579257 (1986-04-01), Brandlein
patent: 5062552 (1991-11-01), Heubel
Schmid Dieter
Schmid Oliver
Hylton Robin A.
Shoap Allan N.
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