Removable closure device for metal containers

A metal container comprising a removable closure device and a container body defining an internal volume adapted to be accessed via an opening, the closure device being located in a position in which it closes the opening, the removable closure device comprising:

• a lid delimited by a peripheral edge and closing the container body;
• a pull tab having a connecting end connected to the lid near a first portion of the peripheral edge and extending in a longitudinal direction toward a second portion of the peripheral edge opposite to the first portion, the tab having a grip end opposite the connecting end, located between the first and second portions of the peripheral edge;
• two stiffening elements placed on the lid on opposite side of the tab, each stiffening element comprising:
• an inner wall having a first curved section closely surrounding the grip end of the tab to prevent the tab from rotating relative to a plane containing the lid, the concavity of the first curved section facing the tab,
• an outer wall extending along a curvilinear path mainly in the longitudinal direction between a first tip facing the first portion of the peripheral edge and a second tip facing the second portion of the peripheral edge,
• wherein tangents lines to the outer walls of each stiffening element at the second tip converge proximate the second portion of the peripheral edge.