Abstract:
The lid of a beverage can has two punched segments, breaking of which forms the respective openings for allowing the liquid to flow out and the air to enter. Breaking of these punched parts is performed by pivoting upwards a main ring mounted on a rivet of the lid and, after breaking open the punched part, pushing downwards a secondary lever with cutting pressure pieces which cut into the punched parts so as to cause breakage thereof. The said secondary lever is mounted on the same rivet, having an end segment which rests against a stop of the ring in order to prevent in the rest condition the pressure pieces cutting into the punched parts. In another simpler embodiment, the secondary lever is dispensed with, so that the pressure piece is incorporated along the contour of the associated main ring.

Description:
OBJECT OF THE INVENTION 
     The present invention, as the title of this specification states, relates to a double opening system for beverage cans for carrying out the execution of two openings in the corresponding upper lid of the beverage container or can being dealt with, with the object of allowing the exit of the liquid during its consumption and, in turn, the entrance of air for preventing the liquid to gush out messily. 
     Another object of the present invention is to be able to perform the opening of the orifice for the entrance of air with a minimum effort by the user, further preventing the accidental opening of that orifice for air entrance. 
     BACKGROUND OF THE INVENTION 
     Beverage containers or cans generally present an upper lid for closing the mouth, the lid having a die cut determining a weakening line for obtaining, when the time comes, a beverage discharging orifice, a rivet for fastening a ring also existing next to this die cut whose retraction carries therewith the opening, when the tilting and pressing of said ring is carried out on the die cut area, producing the ripping thereof and therefore the opening of the can is established for allowing the liquid to exit. 
     Clearly, the opening or orifice made in the mentioned manner, in addition to constituting the liquid exit means, also constitutes the means for air entrance, wherewith the liquid and the air collide and the liquid gushes out messily. 
     DESCRIPTION OF THE INVENTION 
     In order to achieve the objectives and avoid the drawbacks mentioned in the previous paragraphs, the invention consists of a new double opening system for beverage cans which is centred, in principle, on the fact that the ring used for carrying out the tearing of the die cut which establishes the liquid outlet orifice, is complemented with a secondary lever pivotally mounted on the same rivet which mounts the main opening ring, with the special feature that that secondary lever always actuates subsequently to the main ring, to carry out the tearing of the die cut or die cuts corresponding to the air entrance, these being distanced from the die cut corresponding to the liquid outlet, with the special feature that the main ring has a wide window for allowing the tearing lever of the die cut to be placed thereon, which will lead to the air entrance orifice, the free end of this lever being supported on a buffer provided for this purpose on the main ring, for precisely preventing that lever from not acting until the tearing of the die cut which establishes the liquid outlet orifice by means of the main ring has been carried out. 
     The secondary lever for tearing the die cut for the air entrance, and which is mounted on the same rivet as the main ring for tearing the die cut for liquid to exit, features one or two pointed hammers for perforating the lid, so that only a centred hammer would be desirable for the object of minimizing the user&#39;s efforts, although if not perfectly pressed in the direction perpendicular to the lid, the lever would twist without achieving tearing of the die cut, hence two hammers are arranged in a preferred embodiment, thus achieving that the lever is more stable in the pressing operation thereof to establish the orifice corresponding to the air entrance, with the possibility that one of the hammers can be blunt, so that it can only be used to stabilize the mechanism. 
     The die cut or die cuts which are designed to be perforated or torn by the referred to hammer or hammers, shall either be arranged centrally when being a single die cut, or on one side and another of a deep-draw which provides rigidity to the zone and thus prevents the bulge of the lid in the opening processes, in the case of there being two die cuts. 
     The hammer or hammers of the referred to secondary lever have a cutting profile for initiating a puncture of the die cut, and a subsequent pushing of the respective tongue for widening the initial break and increasing the orifice width. 
     As mentioned previously, the main ring whereby the tearing of the die cut for liquid exit is made, has a buffer for the free end of the aforementioned secondary lever, so that when the ring is pulled upward to carry out the correspondent opening during its tilting, it is dragged in tilting to the referred to lever to a point wherein this is released due to the fact that both elements (ring and lever) have different turning radii, so that when it is tilted upward from the main ring it takes the lever therewith, the lever being tilted until the end of said lever is released from the buffer established on the main ring for this purpose, whereby one side of the buffer prevents the accidental perforation of the die cuts for air entrance from being made, and on the other hand, once the tilting of the ring has been performed and the liquid outlet opening has been made, the lever can be pressed downward and its hammers can perform the corresponding opening. 
     The buffer provided on the main ring for preventing the lever hammers from accidentally perforating and/or tearing the die cuts which establish the air entrance orifice or orifices, can be projected either inclining upward or downward, so that in any case the upward tilting of the main lever drags the lever along therewith to a point wherein the end thereof is released from the referred to buffer, as a consequence of the different turning radii of the ring and lever. 
     In a variant of embodiment, said buffer can consist of a bridge lift of the end of the main ring, so that in addition to performing the buffer functions, it allows the introduction of the tip of one&#39;s finger for facilitating the pulling or upward pushing of said main ring. 
     The arrangement and structure of the secondary lever permits one to increase the effort of tearing the die cut which will establish the opening or orifice for air entrance. This increased effort is achieved using the lever concept, strictly speaking. 
     In a simpler embodiment, the secondary lever is dispensed with, so that in this case the main ring has a lower end portion which will fall on an area outlined by the die cut of the lid, executing the tearing thereof and thus releasing the air entrance orifice, after having previously released the liquid outlet orifice. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to complement the description which is made below and with the object of helping towards a better understanding of the characteristics of the invention, the present specification is accompanied with a set of drawings whereby the innovations and advantages of the system made according to the object of the invention are more easily understood. 
       FIG.  1 —Shows a representation according to an upper perspective of a beverage can or container lid, with the double opening system for beverage cans. 
       FIG.  2 —Shows a plan view of the lid wherein the double opening system of the invention is applicable, and in whose lid the die cuts are made for both the opening of a liquid outlet orifice and air entrance openings. 
       FIG.  3 —Shows a sectional view of the opening system applied on the lid represented in the previous figure, in a non-operative situation. 
       FIG.  4 —Shows a sectional view such as that of the previous figure but after initiating the tilting of a main ring, dragging therewith a secondary lever, the position shown corresponding to the specific release point of said secondary lever with respect to the main ring. 
       FIG.  5 —Shows a representation such as that from  FIG. 1 , in a variant of embodiment of the shape or design of the double opening system, wherein a buffer of the main ring is projected inclining downward. 
       FIG.  6 —Shows a sectional view such as the one from  FIG. 3 , but with a buffer of the main ring projected downward, according to the embodiment of the previous figure. 
       FIG.  7 —Shows a view equivalent to that of  FIG. 4 , but with the version of the buffer represented in  FIGS. 5 and 6 . 
       FIG.  8 —Shows a representation such as that from  FIG. 1 , wherein the secondary lever has a window, and the buffer of the main ring for said secondary lever consists of a bridge lift. 
       FIG.  9 —Shows a plan view of a beverage can lid with a double opening system which is simpler than the one represented in the previous figures. 
       FIG.  10 —Shows an elevational view of that represented in the previous figure. 
       FIGS.  11  to  13 —Show respective views of the opening process of a can corresponding to the double opening system shown in  FIGS. 9 and 10 . 
       FIGS.  14  to  16 —Show perspective views of a double opening system for beverage cans different from those shown in the previous figures. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As can be seen from the aforementioned figures, the double opening system for beverage cans according to the object of the invention, comprises a main ring  1  wherethrough the tearing or cutting the die cut  2  is performed, established in the corresponding lid  3  of the beverage container or can, die cut  2  which delimits a tongue  4  which, upon the main ring  1  being tilted, through the rivet  5  as articulation mounting element thereof, loosens that tongue  4  towards the interior to establish the liquid outlet orifice. 
     On the same rivet  5  for tilting and mounting the main ring  1 , a secondary lever  6  is mounted with cutting hammers  7 , lever  6  which is located in a window provided for this purpose in the main ring  1 , the end whereof presenting a narrower small sector  8 , which rests on a buffer  9  emerging from the main ring  1 , as clearly represented in  FIGS. 1 ,  3  and  4 , so that in the resting position the main ring  1 , as is conventional, remains attached on the top surface of the lid  3 , and the end sector  8  of the lever  6  rests on the vertical flap of the buffer  9 , preventing the hammer  7  from falling on the lid  3 , and specifically on die cuts  10  established on said lid  3 , the breaking or tearing whereof, as explained later, carries therewith the formation of orifices for air entrance, allowing consumption of the liquid contained inside the can or container at the same time that the air enters through those orifices caused by detachment of the tongues delimited by die cuts  10 , these being distant from the die cut  2  corresponding to the liquid outlet orifice, which makes it impossible for said liquid to exit through those orifices of the die cuts  10  when the consumption is carried out. 
     I.e., based on the proposed characteristics and solution, the main ring  1  and namely its buffer  9 , block the movement of the lever  6  corresponding to the cutting hammers  7 , it being necessary for the main ring  1  to carry out its upward movement to perform the breaking or tearing of the die cut  2  corresponding to the liquid outlet orifice, in whose tilting the main ring  1  drags therewith the lever  6 , which will also tilt upward, pivoting on the rivet  5 , until releasing that lever  6  of the ring  1 , namely, from the buffer  9  thereof due to them having different turning radii, so that once the opening of the liquid outlet orifice is made, if the main ring  1  is pressed downward, the lever  6  is dragged and the hammers  7  fall on the die cuts  10  producing the tearing and the corresponding opening of the orifices to permit the entrance or air. 
     Between the die cuts  10  and to give a greater consistency to that area of the lid, a deep-draw  11  has been provided, as represented in  FIG. 2 . 
     In  FIGS. 5 ,  6  and  7 , a variant of embodiment of the buffer for the end sector  8  of the lever  6  is shown, so that in this case, said buffer is formed by a flap  9 ′ projected downward in an inclined manner, in order to constitute a ramp for the end edge of the end sector  8  which will initially retain this and therefore the lever  9 ′ until the release is produced in the upward tilting of the main ring  1  as can be seen in  FIG. 6 , which shows the rotating or tilting point wherein the aforementioned release is precisely produced. In this variant of embodiment, the secondary lever  6  remains arranged practically horizontally, as can be observed in  FIG. 6 , with less risk of being accidentally actuated or pressed. Additionally, it can be seen in  FIG. 5  how the design is different from the previous figures, since the main ring  1  has a double lobe shape and a big window, whereas the secondary lever  6  is ovally widened and is also provided with a window. 
     The secondary lever for making the opening of the orifices for air entrance may be made of aluminium, or even of a stamped iron strip, featuring a pre-fold at 10° directly above the rivet  5 , wherein the section for ensuring the folded axis has been reduced, while the hammers  7  of said lever  6  are bent at 90° with respect to the upper face of the lever  6 . 
     Finally, it must be said that the buffer for the secondary lever  6 , instead of being formed by a flap, it is determined by a bridge lift  9 ″ established at the end of the main ring  1 , permitting the positioning of the finger end below said bridge lift  9 ″ to facilitate the actuation or push upwards of said main ring  1  in the opening operation of the can or beverage container being dealt with. 
     In  FIGS. 9 and 10  a simpler embodiment is shown, although less advantageous than that shown in the previous figures. 
     In said embodiment, the main ring  1 ′ lacks the secondary lever  6 , so that in this case said main ring  1 ′ has a lower end portion in the form of hammer  7 ′ directed downward which will fall on the area of the lid outlined by the die cut  10 ′ producing the tearing and corresponding opening of the orifice to allow the entrance of air. 
     As in the previously described embodiment, in the case of the simple embodiment ( FIGS. 9 to 13 ), the tearing of the die cut  10 ′ is performed after having tilted the main ring  1 ′ upward to release the liquid outlet orifice, tearing which outlines the tongue  4 , so that upon tilting the main ring  1 ′ downward again until reaching its initial position and pressing on the end thereof, the lower end portion of the hammer  7 ′ of said main ring  1 ′, said hammer will fall on the area delimited by the aforementioned die cut  10 ′, producing its tearing and therefore the opening of the air entrance orifice. 
     In  FIGS. 14 and 15  a third, more advantageous embodiment is shown wherein, starting from the embodiment shown in  FIGS. 1 to 8 , a secondary lever  6 ′ is incorporated which has a central folding characteristic  12  formed by two downward converging planes which delimit a low relief projection constituting the corresponding hammer  7 ″ facing a die cut unit  10 ″ whose breaking determines the air entrance orifice. The secondary lever  6 ′ also incorporates a characteristic angular configuration end sector  8 ′, whereon the buffer  9 ′ of the main ring  1 ″ will fall. 
     In turn, the outline delimited by the main ring  1 ″ features a characteristic peripheral thickening of more ergonomic rounded cross-section, whose continuity is interrupted by a narrow portion  13  which facilitates the initiation of the lifting of the main ring  1 ″. 
     In  FIG. 16 , a characteristic bulge  14  in the shape of spherical cap delimited for the die cut  10 ″ is shown, corresponding to the air entrance inside the can. 
     Nevertheless, this bulge is also applicable to the die cuts  10 - 10 ′ of the other two embodiments.