Lever ring having a slanted flat strip

A lever ring for seaming to a body (20) and for receiving a closure layer (1) affixed with an edge by means of sealing and for bridging an inner space of the lever ring, to close the body (20) in a seam-connected position, wherein

• (i) the lever ring comprises a continuous flat web (3a, 3b, 3c) which radially outwardly changes into an edge rim (2) of the lever ring, a continuous groove (N1, N2, N3) extending between the edge rim and the flat web;
• (ii) the flat web extends upwardly inclined from a horizontal plane and is provided with an inner curling (4) on its radially inner end so that a closure layer (1) affixed to it by sealing (30) introduces a substantial force component (z) into a sealing seam (30), so that the force component extends in an extension direction of the sealing seam, upon a pressure force (Fi) acting vertically to a plane of extension of the closure layer.