Metallic lid for a can

Abstract

The present lid includes a bottom wall incorporating a side wall to be seated and axially retained in the interior of a seat (S) defined by an opening of the can. The bottom wall includes a peripheral annular portion, a median portion and a rib portion with the approximate form of an inverted U and joining the peripheral annular portion and the median portion. The median portion includes an annular panel and a central panel joined to each other by an axial step portion, an outer peripheral edge of the annular panel being incorporated to the annular rib portion, said axial step portion being constituted by a material that is plastically deformed from the adjacent annular panel portion and from the central panel portion.

1 . A metallic lid to be applied in a can having an opening which defines a seat (S), said lid comprising, in a single piece of metal sheet, a bottom wall which superiorly and peripherally incorporates a side wall provided with a free upper edge and to be frictionally seated and axially retained in the interior of the seat (S), said bottom wall comprising a peripheral annular portion adjacent to the side wall, a median portion and an annular rib portion presenting a cross section with the approximate form of an inverted U, whose lateral legs are inferiorly and respectively incorporated to adjacent edges of the peripheral annular portion and median portion of the bottom wall, said lid being characterized in that the median portion comprises an annular panel and a central panel joined by an axial step portion, an outer peripheral edge of the annular panel being incorporated to the adjacent lateral leg of the annular rib portion, said axial step portion being constituted by a material that is plastically deformed from the adjacent annular panel portion and from the central panel portion. 
     
     
         2 . The metallic lid, as set forth in  claim 1 , characterized in that the radial width (RL) of the annular panel corresponds to about half the radius (R) of the central panel. 
     
     
         3 . The metallic lid, as set forth in  claim 1 , characterized in that the axial step portion presents a height approximately equal to the thickness of the metal sheet used to form the lid. 
     
     
         4 . The metallic lid, as set forth in  claim 1 , characterized in that the annular rib portion projects upwardly from the peripheral annular portion and from the median portion of the bottom wall. 
     
     
         5 . The metallic lid, as set forth in  claim 4 , characterized in that the median portion of the bottom wall is disposed in an elevated plane in relation to a plane which contains the peripheral annular portion of said bottom wall. 
     
     
         6 . The metallic lid, as set forth in  claim 4 , characterized in that the annular rib portion is disposed inferiorly to a plane (Ps) containing the free upper edge of the side wall of the lid. 
     
     
         7 . The metallic lid, as set forth in  claim 1 , characterized in that the annular panel and the central panel are flat, the latter being disposed in a plane slightly superior to that of the annular panel. 
     
     
         8 . The metallic lid, as set forth in  claim 1 , characterized in that the central panel is provided with an inspection opening spaced from the axial step portion, defining a seat for seating and axially retaining a peripheral side wall of an auxiliary lid in a transparent plastic material, said inspection opening comprising a pending skirt formed to incorporate an inner circumferential rib to be fitted in a corresponding circumferential recess provided in the peripheral side wall of the auxiliary lid. 
     
     
         9 . The metallic lid, as set forth in  claim 1 , characterized in that the central panel of the median portion of the lid incorporates a plurality of radial extensions, angularly spaced from each other and which extend till the adjacent lateral leg of the annular rib portion to which they are incorporated. 
     
     
         10 . The metallic lid, as set forth in  claim 9 , characterized in that the radial extensions are coplanar to the central panel.