Sheet-metal closing lid with slightly inclined surface area...

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 51/44 (2006.01) B21D 22/02 (2006.01) B21D 51/38 (2006.01) B65D 17/32 (2006.01)

Patent

CA 2325419

The purpose of the present invention is to ensure the lowering of an opening area as well as the generation of a resistance to an upper compression in closing lids while avoiding buckling-type mechanical deformation of the lowered area during the application of an extended and high-pressure compression from below. To this end, a sheet-metal closing lid for beverage cans comprises from the inside towards the outside a lid surface (10), a peripheral groove (20) and a seamed collar (21). At the level of the lid surface, a flat area (40) is adapted to the shape of a gripping tab (9) and of an opening area (8), and is in a lower position relative to the plane of the lid surface (10). This flat area (40) comprises elongated (42, 43) and short (45, 46) edge areas for defining the same relative to the non-lowered remaining part. One at least of the short edge areas (45) rises slightly (.alpha.) from the plane of the lowered flat area (40) towards the plane of the lid surface (10) located above so as to define a transition area capable of elastic deformation upon the application of an extended compression from the lower side of the lid. This invention also relates to a tool comprising a plurality of individual punches (G, R, H, S) for deforming the lid.

L'invention vise à permettre, dans des couvercles de fermeture, un abaissement d'une zone d'ouverture et l'obtention d'une résistance à la compression supérieure, sans provoquer pour autant des déformations mécaniques par flambage de la zone abaissée lors de l'application d'une compression étendue, par le dessous, à des pressions élevées. A cet effet, il est prévu un couvercle de fermeture en tôle pour boîtes-boissons, comportant de l'intérieur vers l'extérieur, une surface de couvercle (10), une rainure périphérique (20) et une collerette sertie (21). Au niveau de la surface du couvercle, une zone plane (40) adaptée à la forme d'une languette de préhension (9) et d'une zone d'ouverture (8) est abaissée par rapport au plan de la surface de couvercle (10). Cette zone plane (40) présente des zones marginales longues (42, 43) et courtes (45, 46) qui la délimitent par rapport au reste non abaissé. Au moins une des zones marginales courtes (45) remonte légèrement (.alpha.) du plan de la zone plane abaissée (40) vers le plan de la surface de couvercle (10) situé plus haut, de façon à créer une zone de transition déformable élastiquement lors de l'application d'une compression étendue, par le côté inférieur du couvercle. L'invention concerne également un outil constitué de poinçons individuels (G, R, H, S) pour déformer ce couvercle.

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