Patent Publication Number: US-8973777-B2

Title: Beverage can with disc

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the National Stage of International Application No. PCT/EP2011/050364, filed Jan. 12, 2011, which claims the benefit of EP application number 10150507.1, filed Jan. 12, 2010, the disclosures of which are incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     The present invention includes a conventional beverage can having a body, which incorporates an integrally domed base and a side-wall, and an end, which is fixed to the open end of the body using conventional techniques, a double seam for example. 
     BACKGROUND ART 
     It is already known to internally reform the domed base of a beverage can to provide a re-entrant profile. This technique is primarily used to increase the strength of the base, which in turn allows light weighting. For example, EP 0482581 A (BALL CORP) 29.02.1992 describes an apparatus suitable for reforming the base of a beverage can in this way. In particular,  FIG. 11  of this application shows an enlarged cross-section view through a portion of the base of a beverage can after such reforming. 
     WO 96/24539 (KOHORN INTERNATIONAL PTY LIMIT) 15.08.1996 describes a container formed with an open void separate from the main containment volume. Examples of such containers are metal cans, which are formed with a generally concave or domed void in the base, as commonly used for soft drinks, beer etc. This document describes removal means that are provided to substantially close this void, thereby creating a second containment volume that may be used for promotional goods, a second active ingredient or such like. 
     Both these ideas are combined in EP 0958182 B (SCHMALBACH LUBECA) 24.11.1999 which describes a two piece beverage can made substantially of sheet metal having a base that is drawn-in to the inner side of the container, so that the diameter of the base is evidently smaller than the diameter of the container. This document also describes a separate disc-shaped component that is adapted to be fixed into the base. The separate disc-shaped component (“false bottom part”) is separately produced and may therefore be easily decorated etc. 
     SUMMARY OF INVENTION 
     The present invention provides a beverage can ( 1 ) having a base ( 10 ) defining a re-entrant bead ( 17 ) in which a resilient disc ( 50 ) is held captive, characterised in that 
     the diametric dimension of the disc ( 50 ) is larger than the internal diameter of the re-entrant bead ( 17 ) and when the resilient disc ( 50 ) is fitted into the re-entrant bead ( 17 ), the disc ( 50 ) adopts a concave, domed shape. 
     According to the present invention, a resilient disc is snapped into the re-entrant bead at the base of a beverage can. The disc has a means of removal, by which it can be prised out of the re-entrant bead by a user. For example, the disc may have a cut-out that allows it to be prised out of the re-entrant, bead using a tab or a coin. 
     The disc and domed base of the beverage can together define a compartment, which can be used to store additives for the contents of the container or an item such as seeds, a compass, USB device etc. The disc is preferably stamped from a printed sheet of thermoplastic material e.g. PP, PET or other polymer, although other materials such as metal or card are also possible 
     The disc may be fitted into the base of the beverage can either before or after filling the can with product, by a canmaker or packer respectively. Preferably, cut-outs are provided in the disc to allow drainage of any liquid that has collected in the compartment. This allows the disc to be optionally fitted prior to pasteurising or rinsing on the filling line. 
     The inventors have found that the disc can be manufactured to a much tighter tolerance than may be achieved for the diameter of the re-entrant bead and thus, during trials the disc was found to fit tightly in the reformed base of some cans, whereas it only fitted very loosely in the reformed base of other cans. Upon further investigation the inventors found that if the diametric dimension of the disc (i.e. the maximum points of the disc plotted within a circle) was larger than the diameter of the re-entrant bead, the disc could be snapped into the reformed base, but the stresses exerted on the disc by the re-entrant bead, causes the disc to and flex into a concave, dome configuration. Depending upon the dimensions of the disc and the diameter defined by the re-entrant bead of the reformed base (as manufactured), the domed disc takes up a lesser or greater degree of doming. 
     This variable shaped dome has a number of advantages. Firstly, the degree of doming can accommodate any variance between the dimensions of the disc and that of the reformed base of the can. For example, the disc can be manufactured having a tolerance of +−0.1 mm whereas the reformed base conventionally has a tolerance of +−0.3 mm. 
     The disc proposed by the invention includes one or more cut-outs arranged on its periphery. The concave, domed shape of the disc once fitted in the reformed base of the can, assists with the drainage of water from the internal surface of the disc and the stressed/fitted disc is more difficult to remove from the base of the can, reducing the risk of accidental separation from the can. 
     The disc is provided with a removal means, which is sized and shaped to allow a user to remove the disc from the base of the can. The removal means takes the form of a cut-out, which allows a user to insert a lever e.g. a coin or tab, to prise the disc out of the base of the can. 
     In an embodiment of the invention, the disc and base of the can together define three contact points and the removal means is provided by a cut-away, which allows a user to apply a lever under the disc. The two contact points located on either side of the cut away serve as energising prongs. These energising prongs may be located immediately adjacent to the cut-away or they may be displaced from the cut-away, but they must be located within the same half of the disc as the cut-way. The contact point located diametrically opposite the cut away acts as a pivot. In combination, the energising prongs and the pivot causes the disc to spin upon release from the base of the can, much like the flipping of a coin. This provides the opportunity for a simple decision based game. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: 
         FIG. 1  is an isometric view of an upturned beverage can having a reformed base suitable for use in the invention. 
         FIG. 1   a  is a section taken through the base of the beverage can shown in  FIG. 1 . 
         FIG. 2  is a section view of the beverage can according to the invention having a reformed base (as shown in  FIG. 1   a ) with a disc constrained therein, illustrating where a user may apply a lever to prise the disc out of the beverage can base. 
         FIG. 3  is an isometric view of an upturned beverage can having a disc according to a first embodiment of the invention, illustrating how a tab may be used as a lever to prise the disc out of the beverage can base. 
         FIG. 3   a  is a plan view of the disc shown fitted in the reformed base of the beverage can shown in  FIG. 3 . 
         FIG. 4  is an isometric view of an upturned beverage can having a disc according to a second embodiment of the invention, illustrating how a coin may be used as a lever to prise the disc out of the beverage can base. 
         FIG. 4   a  is a plan view of the disc shown fitted in the reformed base of the beverage can shown in  FIG. 4 . 
         FIG. 4   b  is an isometric view of the disc shown in  FIGS. 4 and 4   a.    
         FIG. 5  is an isometric view of an upturned beverage can having a disc according to an enhanced third embodiment of the invention. 
         FIG. 5   a  is a plan view of the disc shown fitted in the reformed base of the beverage can shown in  FIG. 5 . 
         FIG. 5   b  is an isometric view of the disc shown in  FIGS. 5 and 5   a.    
         FIG. 6  is a section view of the beverage can according to the enhanced third embodiment of the invention where the diametric dimension of the disc is larger than the maximum diameter of the cavity formed in the reformed base of the beverage can and when the disc is constrained therein, the disc adopts a concave, domed shape. 
     
    
    
       FIG. 1  generally shows a conventional beverage can  1  according to the prior art, having a base  10  with a stand annulus  15 , a top  20  and a side-wall  30 . In particular,  FIG. 1   a  shows a cross section taken through the base  10  of the can illustrated in  FIG. 1 , which more clearly shows the stand annulus  15  and the concave dome  12  of the base  10 . 
     The base of the can according to the invention is illustrated in  FIG. 2 , where a resilient disc  50  is shown trapped in the re-entrant bead  17 . A compartment (not labelled) is clearly shown, defined between the disc  50  and the domed base of the can  12 . The disc  50  may be removed from the re-entrant bead  17 , using a lever  60  inserted under the disc  50  via a cut-away  55 .  FIGS. 3 and 4  show alternative examples of levers  60  suitable for use in the invention.  FIG. 3  illustrates how a tab  60 ′ may be used as a lever upon opening and after separation from the top of the can and  FIG. 4  illustrates the use of a coin  60 ″. 
       FIG. 3   a  illustrates a plan view of a disc  50  suitable for use in the invention. This disc  50  has a cut-away  55  to allow insertion of a suitable lever  60  and the disc  50  also defines two energising prongs  51  and a pivot  52 . Upon application of a lever  60 ′ by a user of the can (as shown in  FIG. 3 ), the disc  50  is prised from the re-entrant bead ( 17 ) and the combined action of the energising prongs  51  and the pivot  52 , causes the disc to spin (much like the flip of a coin) upon release from the re-entrant bead  17 . 
       FIGS. 4   a  and  4   b  show an alternative disc  50  suitable for use in the invention. This disc  50  has a cut-away  55  to allow insertion of a suitable lever  60 , but the disc  50  is modified to include three large cut-outs (not labelled) between the energising prongs  51  and the pivot  52 . These cut-outs minimise the amount of moisture trapped between the disc  50  and the base of the can  10  and also allow any moisture that is trapped to drain/dry out efficiently. 
       FIG. 5  shows a beverage can  1  according to the invention with an enhanced variant of the disc  50  illustrated in  FIGS. 4 ,  4   a  and  4   b  inserted into the re-entrant bead  17 .  FIGS. 5   a  and  5   b  show a plan view and isometric view of the enhanced disc  50 . Radiuses have been provided on the corners of the contact points (energising prongs and pivot) so there are no longer any sharp corners, as shown  FIG. 5   a . These smoothed corners provide a smooth release as the disc  50  is flipped out of the re-entrant bead  17 . This is independent of the degree of doming of the disc ( 50 ) caused by the variation in dimensions of the disc and the diameter defined by the re-entrant bead of the reformed base. 
     It will be apparent to those skilled in the art that the different examples of suitable lever devices or means to remove the disc from the can may be applied to any of the examples in the drawings. Furthermore, different cut-away designs and number and/or location of cut-outs may be employed without departing from the general teaching of the invention.