Can closure arrangement

Abstract

The present can closure arrangement is applied to cans of the type which comprises: a tubular body carrying an annular upper wall having an inner edge which defines a closure seat whose profile is in the form of a convex arc; and a lid comprising a base portion, a peripheral portion provided with a circumferential cradle in the form of a concave arc, to be fitted and retained in the closure seat, upon closure of the lid; and an annular portion projecting radially outwardly from the peripheral portion, at least one of the parts of annular upper wall of the tubular body and annular portion of the lid carrying an annular gasket to be pressed by the other part, upon closure of the lid, in order to define a respective annular sealing region between the lid and the tubular body.

1 . Can closure arrangement of the type which comprises:
 a tubular body made of sheet metal and which is inferiorly closed and carries an annular upper wall having an inner edge defining an upper opening for the can and which is bent so as to define a closure seat in the form of a convex arc, and   a lid comprising, in a single piece: a base portion, a peripheral portion provided with a circumferential cradle, whose cross section is in the form of a concave arc and which is dimensioned to be fitted and axially retained against the closure seat, upon the seating of the lid on the upper opening of the can; and   an annular portion projecting radially outwardly from the peripheral portion and to be seated onto the annular upper wall, upon closure of the lid, wherein at least one of the parts of annular upper wall of the tubular body and annular portion of the lid carries an annular gasket to be pressed by the other part, upon closure of the lid, in order to define a respective annular sealing region between the lid and the tubular body.   
   
   
       2 . The arrangement as set forth in  claim 1 , wherein the annular gasket is pressed by at least one circumferential rib incorporated to the other of said parts of annular upper wall of the tubular body and annular portion of the lid, upon closure of the latter. 
   
   
       3 . The arrangement as set forth in  claim 2 , characterize herein the annular gasket is attached to the annular portion of the lid, the circumferential rib being defined by deformation of the annular upper wall of the tubular body. 
   
   
       4 . The arrangement as set forth in  claim 1 , wherein the annular gasket is attached into a circumferential recess provided in one of the parts of annular upper wall of the tubular body and annular portion of the lid. 
   
   
       5 . The arrangement as set forth in  claim 4 , wherein the annular gasket axially projects slightly outwardly from the circumferential recess, so as to be pressed by the other of said parts, upon closure of the lid. 
   
   
       6 . The arrangement as set forth in  claim 5 , wherein the annular upper wall of the tubular body carries an upper circumferential projection projecting upwardly to define a barrier against the radial expansion of the material of the annular gasket towards the closure seat, upon molding the annular gasket directly onto the annular upper wall. 
   
   
       7 . The arrangement as set forth in  claim 6 , wherein the upper circumferential projection is defined by a radially inner wall of the circumferential recess. 
   
   
       8 . The arrangement as set forth in  claim 6 , wherein the annular upper circumferential projection of the tubular body is defined close to the inner edge of the annular upper wall. 
   
   
       9 . The arrangement as set forth in  claim 1 , wherein the lid is molded in a single piece of plastic material, with the annular portion inferiorly incorporating a circumferential rib to be pressed against the annular gasket affixed to the annular upper wall of the tubular body. 
   
   
       10 . The arrangement as set forth in  claim 1 , wherein the peripheral portion of the lid presents a generally cylindrical outer face incorporating a circumferential projection which defines, superiorly and jointly with said outer face, the circumferential cradle whose cross section is in the form of a concave arc. 
   
   
       11 . The arrangement as set forth in  claim 1 , wherein the side wall of the tubular body is provided with an upper edge in which is peripherally double-seamed the annular upper wall. 
   
   
       12 . The arrangement as set forth in  claim 1 , wherein the tubular body comprises a side wall provided with an upper edge, the annular upper wall being defined by a radial circumferential rib formed by a recess on the side wall, radially projecting to the interior of the tubular body under the upper edge of the side wall. 
   
   
       13 . The arrangement as set forth in  claim 12 , wherein the radial circumferential rib presents an inner edge configured to define a closure seat in the form of a convex arc. 
   
   
       14 . The arrangement as set forth in  claim 13 , wherein the inner edge of the radial circumferential rib is configured to define an upper circumferential projection projecting upwardly from the annular upper wall of the tubular body, so as to define a barrier against the radial expansion of the material of the annular gasket to the closure seat, upon molding said annular gasket directly onto the annular upper wall. 
   
   
       15 . The arrangement as set forth in  claim 12 , wherein the upper edge of the side wall of the tubular body is outwardly, downwardly and inwardly bent, so as to define a tubular rib externally incorporated to the upper edged of the side wall and extending downwardly, beyond the radial circumferential rib, covering the recess which forms the latter. 
   
   
       16 . The arrangement as set forth in  claim 15 , wherein the tubular rib presents a free lower end portion that is inwardly and upwardly bent and disposed adjacent to the peripheral side wall of the tubular body, under the circumferential rib. 
   
   
       17 . The arrangement as set forth in any one of the  claim 11 , wherein the lid is molded in a single piece of plastic material, with the annular portion peripherally incorporating, by means of breakable bridges, a seal portion comprising a skirt to be seated around the tubular body and axially retained under the upper edged of the side wall. 
   
   
       18 . The arrangement as set forth in  claim 17 , wherein the seal portion presents an interruption extending by at least part of the height of the skirt, the annular portion of the lid radially incorporating a grip tab extending over said interruption, the skirt incorporating the ends of a seal bridge circumferentially extending over the interruption of the seal portion and over the grip tab, one of the ends of the seal bridge being incorporated to the skirt by connecting means to be ruptured when said end is forced away from the skirt. 
   
   
       19 . The arrangement as set forth in  claim 1 , wherein the annular gasket is formed in polymeric resin, such as plastisol, directly molded to one of the parts of annular upper wall and annular portion of the lid.