Abstract:
The beverage can presents immediately below the lid a first chamber not initially containing beverages ready for use, but intended to receive the final beverage, the first chamber being separated by a sealed baffle from a second chamber which already contains, a drinkable liquid; the sealed baffle presenting a housing constructed to receive a filtering device provided with a tube intended to dip into the interior of the second chamber. Elements are provided to enable the consumer to dispose the filtering device in the utilization condition in which communication is established between the two chambers via the filtering device such that, when the can is subjected to the action of a heat source, the liquid contained in the lower chamber is transferred into the first chamber ( 38 ) by passing through the substance, to give rise to the formation of the beverage.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a can for beverages, i.e. a container of a material suitable for food use within which the beverages are sealed for preservation and large scale distribution to the final consumer, which, besides performing said preservation and large scale distribution function for the foods contained therein, enables an extracted and/or infused beverage to be produced at the moment of use by the said can, the thus formed beverage collecting within a cavity in the interior of the can, to be consumed directly from it. 
     It has been statistically shown that coffee is one of the most consumed beverages in the world, a coffee beverage being that beverage formed when ground coffee transfers to hot water the soluble and aromatic substances contained therein, both by the effect of extraction when the water heated to a temperature close to its boiling point is passed through the ground coffee, and by infusion when a certain quantity of ground coffee is left for some minutes in water at a temperature close to its boiling point. 
     In public premises such as hotels, cafeterias, refreshment rooms (for example in offices and stations), this beverage is commonly produced by equipment of considerable size, known as “coffee machines” which require the presence of an operator. 
     In private houses this beverage is commonly prepared using equipment known as “coffee pots”, composed of relative parts; when required, the consumer fills the appropriate parts with tap water and coffee powder, then assembles the parts, places the combination on a source of heat, awaits the formation of the coffee beverage and pours it into cups, finally separating the pieces of the combination and cleaning them to enable another beverage to be prepared. Numerous small coffee machine are also available for household use, these reproducing on a small scale the coffee machines of public premises. 
     For many years the need has been felt by the consumer to be able to obtain the beverage when required, even if he has no coffee pot or large or small coffee machine available; this happens mostly when the consumer is far from home, for example while travelling, when practising sports, or when far from inhabited centres. 
     DESCRIPTION OF THE RELATED ART 
     In attempting to satisfy this requirement, powders instantaneously soluble in water have been marketed, such as that known by the trademark NESCAFE®, however the beverage obtained thereby does not satisfy the palate of the consumer to the same extent as that produced by extraction or infusion. In any event, this makeshift solution does not solve the problem of overcoming the lack of water, a situation which can occur in particular when the consumer is far from inhabited centres (for example during excursions or in a boat), or even more so in countries in which water is not easily available or its drinking quality is uncertain. 
     In an attempt to overcome this drawback, cans containing an already prepared coffee beverage have been marketed for same years, the final consumer heating them when required. However it is well known that the coffee taste alters considerably as a result of subsequent heating after the cooling which the beverage has undergone on preparation, this being shown by the poor distribution which such cans have encountered commercially. 
     An object of the present invention is therefore to satisfy the aforesaid requirements while at the same time obviating the aforedescribed drawbacks. 
     Another object of the present invention, of primary importance (and of evident usefulness) even if expressed subsequent to the first stated object, is to achieve a mass distribution (similar to that currently achieved for COCA COLA®) which enables any person wherever located, provided a heat source is available, to enjoy the invigorating and refreshing properties of a true coffee beverage produced at that moment, while at the same time preserving those elements necessary for preparing the beverage until the moment of their use. 
     A further object is to provide a can which, besides enabling a true coffee beverage to be produced at the moment of need, can be arranged to also produce other beverages obtainable from various substances by extraction and/or infiltration. 
     SUMMARY OF THE INVENTION 
     The aforespecified objects are attained according to the present invention by a beverage can, i.e. a container of the type commonly used for the preservation and large scale distribution of foods and intended to be disposed of after use, said can comprising a side wall, a base and a lid, and allowing access to the foods contained in the can by removing or perforating the lid, characterised in that:
         immediately below the lid there is a first chamber not initially containing beverages ready for use, but intended to receive the final beverage, said first chamber being separated by a sealed baffle from a second chamber which already contains, when the can is supplied to the user, a suitable quantity of drinkable liquid;   said sealed baffle presenting a housing constructed to sealedly receive the non-permeable portion of a filtering device consisting of an envelope enclosing a suitable quantity of a substance able to produce a beverage by extraction and/or infusion and provided with a tube intended to dip into the second chamber containing the liquid;   means being provided to enable the user to dispose the filtering device in the utilization condition in which communication is established between the two chambers via the filtering device such that, when the can is subjected to the action of a heat source by the user, the liquid contained in the second chamber, on attaining a temperature close to boiling point, is transferred into the first chamber by passing through the substance contained in the filtering device, to give rise to the formation of the beverage.       

     The filtering device is preferably already contained in the first chamber, even if not located in its position of utilization, it then being brought into the utilization position by the user. 
     Different types of beverages formable by extraction or infusion can be obtained in the same manner using various substances such as ground coffee and barley, tea, cocoa; said substances can be ground to a more or less fine degree which can vary from very fine powders to pieces of chopped leaves and can be mixed with other foods, for example powdered milk, sugar; hereinafter the term “beverage” will always be used for the final liquid product and “substance” for that contained in the filtering device and able to give rise to the beverage. In the same manner the drinkable liquid will most commonly be water, but can be replaced by or enriched with other liquids such as milk, to give rise to the formation of beverages other than coffee, such as cappuccino; the final liquid product will in all cases be known as the “beverage”. 
     According to one embodiment of the present invention, the first chamber, intended to receive the final beverage, forms one piece with the hollow chamber containing the liquid. 
     According to a variant of the invention, the first chamber for collecting the beverage and the second chamber containing the liquid form one piece with each other and with a sealed baffle which separates them. 
     According to another variant of the invention, the first collection chamber is bounded by a container of roughly cup shape with its mouth facing upwards and having a shape and dimensions such as to be able to be inserted within the side wall of the can to form, between said container and said side wall, an interspace within which when the can is supplied to the user there is already interposed a determined quantity of liquid; the container and the side wall of the can having at least one perimetral region in contact and being sealedly joined together at least in this region. It should be noted that in the described example those walls of the cup-shaped container adjacent to the interspace act as a separation baffle, the interspace forming the second chamber. 
     According to one embodiment of the invention, the can is provided with a filtering device to be inserted into a housing disposed for this purpose on the separation baffle, said housing being initially closed by an impermeable membrane. Said filtering device can be sealedly inserted by the user into the housing such as to break the membrane and hence be in its working condition. The filtering device consists of an envelope which is closed or is closable in the manner of a capsule intended to retain the substance, one end of said envelope being provided with a tube intended to dip into the interior of the second chamber containing the liquid, the other end of said envelope presenting at least one filtering region, i.e. permeable only to liquids so that the liquid, having passed through the ground substance, can emerge into the first chamber acting as the collection chamber; at least one portion of the non-permeable region of the filtering device is shaped to insertingly mate with the housing disposed on said separation baffle, and vice versa. 
     If necessary, the stability and the seal of the filtering device at the perimeter of the housing in which said device has been inserted can be ensured by suitable gaskets. 
     Conveniently, when the can is supplied to the user, the filtering device is already contained in the first collection chamber so that the user, having removed or perforated the lid, has access to said filtering device and can operate on it to move it into its final working position. Alternatively, the filtering device could be not already located in the can, but instead accompany it, for example in a package containing a can with a filtering device next to it. 
     Conveniently the filtering device already contains a determined quantity of substance when the can is supplied to the user. Alternatively, said quantity of substance could be not contained in the filtering device but instead could accompany it (for example suitably packaged within the collection chamber), in which case the filtering device must be openable to enable the user to insert said substance into it. In particular the substance can be packaged within a permeable envelope (for example a sachet of filter paper) insertable into the filtering device. 
     According to one embodiment of the invention, the means for putting the substance contained in the filtering device into communication at the moment of use with the interior of the mass of liquid contained in the second chamber comprise:
         a tube forming part of the filtering device, one end of the tube being free;   a region of the sealed separation baffle pierceable by the free end of the tube by the intervention of the user;   and means for providing the outward seal between the second chamber already containing the liquid and the tube when the can is in its utilization condition.       

     According to a further variant of the invention, the means for putting the substance contained in the filtering device into communication at the moment of use with the interior of the mass of liquid contained in the second chamber comprise:
         a housing disposed on the sealed separation baffle and consisting of a circumscribed region which can be opened by the user by lifting a tab or by piercing, such as to create a through hole between the second chamber already containing the liquid and the first chamber intended to contain the final beverage, within which hole the filtering device can be received;   and means for providing the outward seal between the second chamber already containing the liquid and that portion of the filtering device which has been placed in the hole by the user.       

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be more easily understood from the ensuing description of two embodiments thereof given by way of example. In this description, reference is made to the accompanying drawings, in which: 
         FIG. 1  is a vertical axial section through a first embodiment of the can of the invention, this can being in the condition in which it is supplied to the user; 
         FIG. 2  is a section similar to that of  FIG. 1 , but with the can in its utilization condition achieved by the intervention of the user; 
         FIG. 3  is a partial section through a variant of the can of  FIGS. 1 and 2 , in the condition corresponding to that of  FIG. 1 ; 
         FIG. 4  shows the same variant as  FIG. 3 , but in the condition corresponding to  FIG. 2 ; 
         FIG. 5  shows a detail of another variant of the can of  FIGS. 1 and 2 ; and 
         FIG. 6  shows a detail of another variant. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As can be seen in  FIGS. 1 and 2 , the can  10 —indicated specifically by  10 A in the condition of  FIG. 1  and by  10 B in the condition of FIG.  2 —comprises an outer container  12  of cup shape and an inner container  14  also roughly of cup shape, the inner container  14  being inserted concentrically into the outer container  12 . In the illustrated example, the two cups  12  and  14  are of a suitable material (for example aluminium or plastic) to enable the relative upper edges to be turned over and clinched or welded together in conventional manner (as shown schematically in said figures), to obtain a seal between the two. Consequently a sealed intermediate chamber  16  is obtained, already containing a quantity of liquid (for example water). The inner container  14 , the walls of which also act in this case as the separation baffle, laterally and lowerly bounds an upperly open chamber  38  to act as the chamber for receiving the beverage produced in the can  10 . As can be seen in  FIG. 1 , an upperly open coaxial duct  20  extends downwards from the base of the inner container  14  and is closed lowerly by a sealing membrane (for example a sheet of aluminium of the type which closes the mouth of certain toothpaste tubes). As can be seen from  FIG. 1 , a tube  22  of a suitable material, for example plastic, and forming part of a filtering device indicated overall by  24 , is partially inserted by slight forcing into the duct  20 . The tube  22  has an outer diameter such that to insert the tube  22  into the duct  20  a force has to be exerted which besides serving to retain the tube  22  in the duct  20  (the condition shown in  FIG. 1 ), also provides the required seal between the tube  22  and the duct  20 . Consequently, by forcing the tube  22  of  FIG. 1  downwards into the duct  20 , the user obtains the situation shown in  FIG. 2  in which the lower end (preferably shaped as a flute mouthpiece, as in said figures) of the tube  22  has pierced the sealing membrane  34  which closes the lower end of the duct  20 . In addition to the tube  22 , the filtering device  24  also comprises a hollow part shaped as a capsule  26  (substantially spherical in the specific example) already containing a determined quantity of substance  28  (for example ground coffee). The substance  28 , which can also be in the form of granules or powder, cannot descend into the tube  22  because at its upper mouth, communicating with the interior of the spherical wall  26 , there is provided a liquid-permeable baffle, indicated in  FIG. 1  by  30  (for example formed from filter paper or a suitable mesh). As can be seen in  FIG. 1 , the spherical part  26  of the filtering device  24  presents a series of perforations  32  in its upper part so that the capsule is provided with a permeable region through which the final beverage can emerge. 
     When the can  10  is supplied to the user (i.e. when he purchases it), the filtering device  24  is in the condition  10 A of  FIG. 1 , as stated. 
     It should be noted that the can  10  could remain in the condition  10 A of  FIG. 1  even during use if the sealing baffle  34  is formed of a substance able to dissolve following heating. In that case the intervention of the user is limited to the operation of subjecting the can  10 A to the action of a source of heat. The same would apply if the sealing baffle consisted of a membrane pierceable by the effect of the pressure increase created within the second chamber  16  containing the liquid  18  when the can is subjected to the action of a heat source; this membrane would evidently have a resistance to pressure less than that of the wall of the chamber  38  and of the separation baffle  14 , and also less than that of the release pressure of a safety valve  36  with which the can is provided (and which will be described hereinafter). Again in this case the intervention of the user is limited to the operation of subjecting the can  10 A to the action of a heat source. 
     The can  10 A is conveniently provided with a removable lid  40 ; the edge of this lid can be turned over and joined by clinching or welding to the edges of the two containers  12  and  14 , the lid being for example provided with a known ring (not shown) for tearing off the lid. Alternatively, the can could be provided with a common cover (for example of plastic)  42  applicable by pressure to the upper edge of the can  10 . The can could also be provided with a further cover positioned (for example for hygienic reasons) above one of those already described. 
     As will be apparent from the aforegoing description, the can is of extreme simplicity and very low cost (especially if constructed of aluminium and/or plastic). This is important given that, as will be immediately apparent, the can cannot be reused in practice, so that it is of disposable type, to be thrown away after use. 
     It should be noted that the term “can” is commonly used to define food containers constructed of materials other than the tinplate formally used for the originally named “tin cans”, provided that they are suitable for food preservation, for example aluminium or plastic, hence in the present invention the can construction material is to be understood in the widest sense. For the same reason the term “can” also indicates containers of not exclusively cylindrical shape (for example parallelepiped). 
     Although apparent from the aforegoing description, a short description will now be given of the use of the can  10  for greater clarity. 
     As stated, the user purchases the can  10  in the condition  10 A of  FIG. 1 . 
     When he decides to use it to obtain the relative beverage, the user after removing any cover has merely to force the filtering device  24  inwards with the fingers so that the tube  22 , which has not yet been completely inserted into the duct  20 , enters it as far as possible. The result is that the flute mouthed tip of the tube  22  pierces the sealing baffle  34 , until it arrives in proximity to the base of the outer container  12  (the can being now in the condition  10 B of  FIG. 2 ) so that the tube  22  dips into the mass of liquid (for example water) contained in the second chamber  16 . The filtering device  24  is advantageously constructed of a plastic material suitable for contact with foods but sufficiently rigid to enable the tube  22  to be forced into the duct  20 , the forcing also ensuring the necessary seal between the tube  22  and the inner wall of the duct  20 . 
     With the can in the condition  10 B it need only be subjected to the action of a heat source (for example by placing it on a flame or in a microwave oven), until the liquid  18  contained in the chamber  16  boils, so that this liquid rises along the tube  22 , passes through the mass of substance  28  contained in the capsule  26 , to leave in the form of a beverage from the perforations  32 , and be finally collected in the inner container  14  which, as stated, acts as a collection chamber for the beverage; at this point the user can also drink the beverage directly from the can, as happens with other beverages (for example beer) commonly distributed in cans. When the beverage has been drunk or used, the can is disposed of. 
     It should also be noted that the can  10  can also be sold without the filtering device being located in the position of  FIG. 1 , it simply lying in the inner container  14  if sufficiently large. In that case a closure, for example a cover of the aforedescribed types, prevents the accidental escape of the filtering device from the can upper aperture while at the same time preserving its aroma. As an alternative to the aforedescribed covers, but for the same covering purpose, the can could be wrapped in a packaging wrapping, for example in a sheet of heat shrinkable plastic). It should be noted that the filtering device can also be disposed on the outside of any cover. If the filtering device  24  is not already disposed in the position of  FIG. 1 , breakage of the separation baffle  34  can take place in a pierceable region  34 , which can be pierced by other means instead of the lower end  33  of the tube  22 , and in particular by a plastic stick or pin with which the can may be provided. Another variant is that shown in  FIG. 5 , in which the duct  220  extends slightly above (portion  220 A) a separation baffle  214 , on the upper mouth of the portion  220 A there being applied a sealing membrane  234  which can be torn off by the user on utilization, this operation being facilitated by a gripping tab  235 . 
     According to a particularly simple variant ( FIG. 6 ) of the invention, the housing for the tube  22  and the pierceable region of the separation baffle are obtained simply by centrally providing in the separation baffle  314  a thin circular area  334  which is easily pierced by the tube  22  or by other means. According to a further variant of the can of the invention (shown partially in  FIGS. 3 and 4 , but for the rest similar to that of  FIGS. 1 and 2 ), the larger diameter upper part of the tube  122  is externally threaded, this thread being arranged to engage a female thread provided in the inner wall of the duct  120 . In  FIG. 3  the filtering device  124  (which in this case is of ovoidal shape) is in the condition (that in which the can is supplied to the user) in which only a part of the threaded portion of the tube  122  is screwed (preferably slightly forced) into the duct  120 . 
     When the user wishes to use this can, he merely screws the tube  122  completely into the duct  120 , with the result that the lower flute mouthpiece-shaped end  133  of the tube  122  pierces the sealing membrane  134 , to achieve the condition shown in  FIG. 4 , in which the lower end  133  of the tube  122  dips into the liquid contained in the second chamber (not shown). This embodiment is appropriate both if the filtering device is formed of a suitable plastic material, so that by appropriately choosing the dimensions and material of the tube  122  the seal can also be obtained between the tube  122  and the duct  120 , and if a suitable metal (such as aluminium) is used or a plastic material which does not enable said seal to be obtained. However in this latter case a seal gasket such as that indicated by  140  in  FIGS. 3 and 4  must be used to provide the seal. 
     It should be noted that if in addition to the filtering device  24  or  124  the two containers  12  and  14  are also constructed of an appropriate plastic suitable for contact with food, the can will not be suitable for placing on a flame or an electric hotplate, but can be used by insertion into a microwave oven. 
     Finally it should be noted that the can of the invention, and particularly the second chamber already containing the liquid, can be conveniently provided with a safety valve. This latter can be conveniently positioned to vent into the first chamber acting as the collection chamber. In this manner external projections are avoided so that the can does not differ externally in its shape and appearance from a normal commercially available food can and can be treated and handled as such. 
     With regard to the substance to be used in the can of the invention to obtain the relative beverage, in addition to chopped or powdered substances, substances of gelatinous form (including in capsules) can be used, provided they are suitable for producing the required beverage when located in the filtering device.