Abstract:
A system and method for dispensing a predetermined portion of a beverage or drink additive using a cost effective portion control valve that replaces electrical components with mechanical components. The present invention dispenses a controlled portion of a beverage when a lever is activated. A magnetically coupled linkage system can control the exact amount of fluid dispensed. A valve block contains a beverage input, a beverage outlet, and a valve seal. A lever arm is connected to the valve seal and connected to a magnetic housing containing a valve magnet. A yoke pivots about the valve block where the yoke contains a yoke magnet aligned to interface with the valve magnet. A lever arm return spring is connected to the lever arm and the valve block to bias the lever arm return spring to a resting position. As the yoke pivots beyond a predetermined distance, the yoke magnet separates from the valve magnet allowing the lever arm to return to the resting position closing the valve.

Description:
[0001]    This is a continuation of application Ser. No. 13/229,632 filed Sep. 9, 2011, now U.S. Pat. No. 8,523,022 issued Sep. 3, 2013. Application Ser. No. 13/229,632 is hereby incorporated by reference in its entirety. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates generally to the field of beverage dispensers and more particularly to an advanced control valve for a beverage dispenser. 
         [0004]    2. Description of the Prior Art 
         [0005]    Portion control valves are used in beverage dispensers to control the portion of a beverage being dispensed. There are numerous considerations in the design and manufacture of portion control valves, including the cost and maintenance of the device. Prior art devices use an electric solenoid, or other electric motors, to control the opening and closing of a valve. The electric solenoid or electric motor may contain a timing device for keeping the valve open for a predetermined time. Such electric devices are costly, especially in beverage dispensers having multiple valves and therefore requiring multiple electric devices. Moreover, the prior art devices require electricity and therefore may only be used where electricity is available. Electric devices may also require periodic maintenance, which further increases the cost of operating a prior art device. 
         [0006]    It would be extremely advantageous to have an advanced portion control valve which dispenses controlled portions at a reduced cost by eliminating all electronic components. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention relates to a valve for dispensing a predetermined portion of a beverage. One aspect of the invention recognizes that a more cost effective portion control valve can be achieved by replacing the electric components with mechanical components for dispensing a controlled portion of a beverage when a lever is activated. A pair of magnets or a magnet with mating magnetic material, i.e. metal tab, screw head, etc., in a mechanical system control an amount of fluid dispensed. A valve block contains a beverage inlet, a beverage outlet, and a valve seal. A lever arm is connected to the valve seal and connected to a magnetic housing containing a valve magnet. A yoke pivots about the valve block where the yoke contains a yoke magnet or magnetic material, i.e. metal tab, aligned to interface with the valve magnet. A lever arm return spring is connected to the lever arm and the valve block to bias the valve seal to a resting/closed position. As the yoke pivots beyond a predetermined distance, the yoke magnet separates from the valve magnet allowing the valve arm to return to the resting position closing the valve. 
     
    
     
       DESCRIPTION OF THE FIGURES 
         [0008]    Attention is now directed to several drawings that illustrate features of the present invention: 
           [0009]      FIG. 1  is a side perspective view of an embodiment of the present invention. 
           [0010]      FIG. 2  is a front perspective view of the embodiment of  FIG. 1   
           [0011]      FIG. 3  is a rear perspective view of the embodiment of  FIG. 1   
           [0012]      FIG. 4A  is a top view showing the location of Section Z-Z. 
           [0013]      FIG. 4B  is a sectional view taken along Section Z-Z. 
           [0014]      FIG. 5A  is a front view of the lever arm mechanism. 
           [0015]      FIG. 5B  is a perspective view of the lever arm coupling piece. 
           [0016]      FIG. 5C  is a top view of a lever arm rod. 
       
    
    
       [0017]    Several drawings and illustrations have been presented to aid in understanding the present invention. The scope of the present invention is not limited to what is shown in the figures. 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0018]    Referring now to the drawings, in which like numerals refer to like elements throughout the several views,  FIGS. 1-5  show an embodiment of the mechanical portion control linkage system of the present invention. The mechanical portion control linkage system may be used as part of a beverage dispenser for dispensing various types of beverages or other fluids. In particular, the beverage dispenser of the present invention can open two or more valves simultaneously to allow a predetermined flow of two or more different beverage fluids wherein a nozzle downstream of the valve can then mix the beverage fluids to produce a portion amount of a beverage drink or an additive such as flavor. 
         [0019]    Turning to  FIGS. 1-3 , a valve block  9  defines a passage way for the passage of fluid. The valve block  9  may include one or more such passageways. As previously stated, multiple passageways allow for the simultaneous dispensing of multiple fluids. The passageway has a fluid inlet for accepting a fluid to be dispensed, and a fluid outlet through which fluid is dispensed. A valve seal  11  is located between the fluid inlet and the fluid outlet. The valve seal  11  blocks the passageway when the valve seal is in its closed position and allows flow when the valve is in an open position. The valve seal  11  is operably coupled to a lever arm  14  which is an elongated rod, as specifically shown in  FIGS. 5A and 5C . The assembly can include one, two or more lever arms  14  attached to one, two or more valve seals  11  at a first end and to a stop tab member  16  at the other end. The stop tab member  16  holds the lever arms together. Rotation of the lever arm  14  causes the valve seal or seals  11  to partially open, thereby allowing passage of fluid through the passageway and to the fluid outlet. The stop tab member  16  can contain a magnet housing  10  with a magnet  4 . The lever arm can thus be magnetically, or otherwise, coupled to a yoke  5  and lever  6 . Therefore, activation of the yoke  5  and lever  6  causes the lever arm  14  to rotate and the valve seal  11  to open. After the lever  6  and yoke  5  have moved a particular predetermined distance, they disengage from the lever arm  14  (typically by pulling the magnets apart), allowing the lever arm to return to a resting position closing the valve seal  11 . 
         [0020]    The lever  6  and the yoke  5  may be permanently attached to each other, or the lever  6  may be detachable from the yoke  5 . In some embodiments, the lever  6  may be easily detached from the yoke  5 . Detaching the lever  6  from the yoke  5  allows for ease of cleaning the separate components. 
         [0021]    A yoke magnet  2  can be attached to the yoke  5 . Typically, the yoke magnet  2  is a magnetic screw which is screwed into the yoke  5 . While this is the preferred embodiment, the yoke magnet  2  may take many different forms and configurations. Any form of yoke magnet, and any form of coupling between the yoke and the lever arm is within the scope of the present invention. 
         [0022]      FIG. 4A  is a top view of an embodiment showing the location of section Z-Z. This section is shown in  FIG. 4B . As can be seen in  FIGS. 4A-4B , and in  FIG. 4B  in particular, the yoke  5  is fastened to a pivot point  13  on the valve block. The pivot point  13  is positioned such that the yoke magnet  2  interfaces with a lever arm magnet  4  in the magnetic housing  10  when the yoke  5  is in a rest position. Activating the lever  6  causes the yoke magnet  2  to rotate about the pivot point  13 . In  FIG. 4B , the yoke  5  is shown in its activated position, with the yoke magnet  2  and the lever arm magnet  4  being decoupled. A yoke spring  7  causes the yoke  5  and handle  6  to return to a relaxed position after being pulled. 
         [0023]    As shown in  FIGS. 5A-5C , a magnetic housing  10  can be attached to a stop tab member  16 , which can be a flange that protrudes from the magnetic housing  10 . The magnetic housing  10  and stop tab member  16  can be connected to at least one lever arm  14 . Each lever arm  14  is normally pivoted about a valve in the valve block and configured to open the valve seal when the lever arm  14  rotates away from its rest position. In this way, rotation of the magnetic housing  10  and stop tab member  16  causes each connected lever arm  14  to rotate away from its rest position, thereby opening its associated valve. The number of lever arm and valves can be varied to allow a desired number of liquids to be dispensed. For example,  FIG. 5A  shows two lever arms  14 , each coupled to a separate valve seal  11  and also coupled to the magnetic housing  10  and stop tab member  16 . The lever arm assembly of  FIGS. 5A-5C  can be used to control two passageways, thereby enabling the system to dispense predetermined portions of two separate beverage fluids. These fluids are usually mixed in a nozzle further downstream to produce a beverage drink. In turn, lever arm assembly of  FIGS. 5A-5C  can be used to control one passageway, thereby enabling the system to dispense predetermined portions of an drink additive directly into a drink or cup. 
         [0024]    Returning to  FIG. 2 , a lever arm return spring  15  biases the lever arm  14  to its rest position. The lever arm return spring  15  may be a compression spring having two end points. One end point may be connected to the lever arm  14 , and the other end point may be connected to a connection point on the valve block. The connection point on the valve block is typically positioned between the lever arm  14  and the direction of rotation of the lever arm  14 . In this embodiment, the lever arm return spring  15  compresses between the lever arm  14  and the valve block as the lever arm  14  rotates to open the valve. The load of the compressed spring acts as a force that biases the lever arm  14  to its rest position. 
         [0025]    In an alternative embodiment, the lever arm return spring  15  may be a tension/extension spring connected between the lever arm  14  and the valve block. In this embodiment, one end of the tension/extension spring is connected to the lever arm  14 , and the second end of the tension/extension spring is connected to a connection point on the valve block. The connection point on the valve block is located behind the lever arm  14  and away from the direction of rotation. The lever arm  14  rotates away from the connection point on the valve block, thereby creating a tension force in the tension/extension spring. The tension force biases the lever arm  14  to its rest position. The lever arm return spring  15  may be connected directly to the lever arm  14 , or it may act indirectly on the lever arm  14  by being connected to the magnetic housing  10 . 
         [0026]    As shown in  FIGS. 1-3 , in order to dispense a portion of a beverage, an operator activates the lever  6  by pushing on it. The lever  6 , yoke  5 , and yoke magnet  2  rotate about the pivot point  13 . The yoke magnet  2  is magnetically coupled to the magnetic housing  10 , thereby causing the magnetic housing  10  and the attached lever arm  14  to rotate with the yoke magnet  2 . The magnetic housing  10  and lever arm  14  rotate against the force of the lever arm return spring  15 . As the lever arm  14  rotates away from its rest position, it opens the attached valve seal  11  and beverage is dispensed through the valve outlet. The valve seal  11  remains open and beverage is dispensed as long as the lever arm  14  remains rotated away from its rest position. 
         [0027]    As the magnetic housing  10  rotates further from its rest position, the load or tension in the lever arm return spring  15  increases. Once the magnetic housing  10  rotates to a certain predetermined depression distance, the load or tension in the lever arm return spring  15  becomes greater than the magnetic force coupling the yoke magnet  2  and the magnetic housing  10 . Accordingly, the force of the lever arm return spring  15  causes the yoke magnet  2  and the magnetic housing  10  to decouple and disengage. With the magnetic coupling between the yoke magnet  2  and the magnetic housing  10  disengaged, the lever arm return spring  15  returns the lever arm  14  to its rest position. The valve seal  11  closes when the lever arm  14  is returned to its rest position, and the portion of beverage has been dispensed. 
         [0028]    The depression distance at which the yoke magnet  2  and the lever arm magnet  4  disengage may be adjusted, thereby adjusting the distance that the lever arm  14  rotates before disengaging from the magnetic housing  10 . A greater depression distance therefore causes the valve seal  11  to be open for a longer period of time, increasing the volume of the dispensed portion. The depression distance may be varied, for example, by altering the strength of the magnetic coupling, or the strength of the lever arm return spring  15 . 
         [0029]    A permanent stop  17  may optionally be attached to the valve block to disengage the magnetic housing  10  from the yoke magnet  2  at a depression distance. The permanent stop  17  can extend from the valve block to receive the stop tab member  16  protruding from the magnetic housing  10 . As the lever  6  is operated, the yoke magnet  2  and the magnetic housing  10  rotate towards the depression distance. At the depression distance, the permanent stop  17  engages the stop tab  16 , but does not engage the lever  6 , yoke  5 , or yoke magnet  2 . The yoke  5  decouples from the magnetic housing  10 , and the lever arm return spring  15  forces the magnetic housing  10  and the attached lever arm  14  to return to their rest position. 
         [0030]    The permanent stop  17  may be adjustable such that the depression distance at which the permanent stop  17  receives the stop tab  16  is varied. In one embodiment, the permanent stop  17  includes an adjustment screw  18 . The adjustment screw  18  can be screwed in to the permanent stop  17 . As the adjustment screw  18  is screwed in to the permanent stop  17 , it extends through the permanent stop  17  and acts to engage the stop tab  16 . In this embodiment, the depression distance is decreased as the adjustment screw  18  is screwed further into the permanent stop  17 , and the depression distance is increase as the adjustment screw  18  is unscrewed from the permanent stop  17 . The depression distance may be varied using many other permanent stop  17  configurations. 
         [0031]    The mechanical portion control linkage system may include a lever yoke return spring  7 . As shown in  FIG. 2 , the lever yoke return spring  7  is connected to the valve block. The lever yoke return spring  7  acts to return the yoke  5  and lever  6  to their rest position after the lever  6  is activated by the operator. In an embodiment, the lever yoke return spring  7  can be stainless steel. Any strong spring material is within the scope of the present invention. The yoke  5  and lever  6  may be biased to its rest position using many different springs and configurations, including through the use of a compression spring or a tension/extension spring. 
         [0032]    Several descriptions and illustrations have been provided to aid in understanding the present invention. One with skill in the art will realize that numerous changes and variations can be made without departing from the spirit of the invention. Each of these changes and variations is within the scope of the present invention. In particular, the present invention will work with any type of fluid if proper valves are used. This includes both liquids and gases.