for the purposes of promoting an understanding of the principles of the invention , reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same . it will nevertheless be understood that no limitation of the scope of the invention is thereby intended . referring now to the drawings in detail , a frozen beverage freezer machine 11 , which may be floor - mounted , table - mounted , or otherwise mounted , has two beverage freezer cylinders 12 and 29 which can be of conventional construction and mounted side - by - side to the freezer . each of the cylinders , such as cylinder 12 for example in fig2 , has an open end at the face 16 of the freezer . dispenser head 14 is secured to the front 16 of the freezer by fasteners ( not shown ) through holes 61 in the head and anchored in the freezer . therefore , at each cylinder the open end is exposed to back face 33 ( fig2 ) of a shallow , cylinder - receiver recess defined by flange 34 . a seal ring 31 is received in groove 32 to seal the head to the cylinder 12 . as shown in fig2 , 5 and 6 , a passage 18 opens at face 33 and communicates directly with the bore 21 of valve 22 of the dispenser head . thus , a supply a soft - frozen beverage from cylinder 12 is always available for dispensing from the valve 22 by pulling down the handle 23 which lifts the piston 24 to discharge the beverage from the valve assembly downward in the direction of arrow 26 to dispense the beverage into a user &# 39 ; s cup or other container when the valve is opened by pulling down the handle . a valve closing return spring 27 maintains a downward force on the valve to close the valve when the user releases the handle 23 . the same type of arrangement as described for the cylinder 12 and valve 22 is provided for cylinder 29 and valve assembly 28 . a rectangular boss 36 projects to the rear from the face 33 and receives a post 37 which is a part of the cylinder and remains stationary as a stirrer ( not shown ) rotates in the cylinder . the stirrer is a conventional part of the freezer cylinder and it functions to scrape the wall as well as affecting ice crystal size . the stirrer rotates in the cylinder to keep the frozen beverage in the freezer cylinder in a state where it can readily flow . as described above , the beverage in the cylinder 12 is exposed to the back face 33 of the dispensing head 14 . referring to fig2 and 6 , a passageway 18 is provided in the head and has an entrance 18 e in face 33 and extends to an exit at the bore 21 of valve assembly 22 . the passageway entrance appears as a double opening . that is because there is a partition 19 which extends in the passageway 18 from the entrance 18 e to the passageway exit opening at the bore 21 . it serves to prevent a person who might be servicing or cleaning the equipment from getting a finger into the path of the stirrer in the freezing cylinder or the path of the piston 24 in the bore at any time that the piston is being moved down in the bore 21 by the piston return spring 27 . the piston seal in the bore is by o - ring 38 above the exit port of passageway 18 into the bore 21 , and by o - ring 39 , below the exit port . the additional function of the partition 19 is to help maintain the o - ring seal 39 in its groove as the seal crosses the passageway 18 exit port during the opening and closing of the valve 22 . with the apparatus as described to this point , dispensing a soft - frozen beverage from freezer cylinder 12 is accomplished by simply pulling down on knob 23 as discussed above . this raises the piston 24 enough to enable the beverage to flow through the inlet port 18 e , through the passageway into the bore 21 , and down in the direction of arrow 26 and out the beverage dispensing port 41 . dispensing of the soft - frozen beverage from cylinder 29 is accomplished in the same way by pulling the knob 42 to open the valve assembly 28 to discharge soft - frozen beverage from cylinder 29 through valve 28 and out through dispensing port 43 . to enable dispensing soft - frozen beverage from both cylinders simultaneously and , thereby providing a mix of the two beverages , the third valve assembly 46 is provided . this valve assembly is in communication with both cylinders at the same time by passageways opening in the back wall of the head at each of the cylinder receiver recesses , such as wall 33 for reception of cylinder 12 . for cylinder 12 , an opening 47 e into passageway 47 provides entry of beverage from cylinder 12 down and forward to a side of piston 44 in bore 49 in head 14 . the same arrangement in a mirror image is provided for freezer cylinder 29 . therefore , the piston 44 is operable by handle 50 to open the valve 46 and dispense soft - frozen beverages simultaneously from both of the cylinders 12 and 29 through passageway 47 for cylinder 12 and passageway 51 for cylinder 29 . passageways 47 and 51 are long enough between the faces such as 33 and the passageway exits into the valve bore 49 that if the handle 50 of the central valve 46 is not operated often enough to maintain a significant flow from the two beverage freezer cylinders , there is a possibility of ice accumulation in the passageways causing clogs . to inhibit development of clogging , or break a clog which has formed in one or the other of such passageways , two breakers are provided and extend outward from the piston 44 of the center valve assembly 46 toward the passageway entrances at cylinder receivers such as at 33 for cylinder 12 . referring to fig4 , 5 and 7 , for passageway 47 , for example , a breaker 53 extends from a mounting in the side of the piston to a distal ( tip ) end 53 e near the entrance 47 e of channel 47 at the face 33 of the head 14 . the proximal end 53 x of the breaker at the piston is secured to the piston by an o - ring of shape fitting a somewhat serpentine groove 64 in the piston and extending around an upstanding outer surface 53 s of a hub or key portion 53 k of breaker 53 and holding the proximal end portion of the breaker 53 in an outwardly opening , axially extending slot 44 s in the piston . accordingly , the breaker 53 is confined in the slot so that whenever the piston 44 is raised or lowered , the breaker will be raised and lowered in the passageway 47 sufficiently high and low to enable the breaker to be moved up and down in the passageway , whereby any packed volume of ice crystals in the passageway 47 can be agitated such that displacement of the packed crystals occurs . when the valve is opened by pulling the handle , this will allow soft frozen beverage to flow from the freezer cylinder 12 down and out the valve dispensing outlet 60 . the same arrangement is provided for the passageway 51 serving the freezer cylinder 29 , with a breaker 67 mounted in a slot in the piston 44 in the same way as breaker 53 is mounted in the piston . the breakers 53 and 67 are mirror images of one - another . therefore , upon pulling handle 50 , the piston 44 moves up to open the valve and the breakers will be pulled up in their respective passageways to loosen and move any potential ice clogs , and soft frozen beverages from both cylinders flow through their respective passageways into the valve bore 49 and downward and out through the dispensing port 60 into a cup or receiver placed under the port by the user . it can be noted in fig5 that the passageways 47 and 51 slope downward and forward from their entrance face ( such as 33 for passageway 47 ) to the bore for piston 44 . the currently preferred slope is eleven to approximately fifteen degrees from horizontal . referring to the breakers in more detail , breaker 53 is an example , and the description of it is useful for both 53 and 67 , as they are mirror images . as shown in fig7 and 8 and some others , breaker 53 is elongate from a proximal end 53 x outward to a distal end 53 e . there is the upstanding hub key 53 k at the proximal end . an upstanding post 53 p is adjacent the distal end . a broad and up - curved surface is provided at 53 b . the breaker is disposed in its respective passageway at slopes as mentioned above . referring to fig9 and 10 , fig1 shows a vertical slot 44 s opening outward in the piston 44 . this slot fittingly receives the key portion 53 k of the breaker 53 from the bottom 44 s of the slot to the top of the slot . therefore when the piston is raised and lowered to respectively open and close the valve 46 , the breaker captured in the slot will be raised and lowered likewise . the knob 53 n projecting laterally from the key 53 k is received in the groove 44 g in the piston . as shown in fig1 , a groove 44 r is provided in the piston surface . the groove follows a rectangular path in the surface of the piston resulting in a sort of knob 44 k in the piston . as shown in fig9 , the rounded top of the key 53 k projects slightly into the groove 44 r under knob 44 k . an o - ring is received in the groove 44 r around the knob 44 k and slightly covers the rounded side portion of the key 53 k adjacent the top of the key , helping retain the breaker 53 in the slot 44 s and groove 44 g . as shown in fig1 , a recess 45 is provided at a portion of the bottom of groove 44 r and extends down to groove 44 g . it facilitates removal of an o - ring from grove 44 r when desired . referring to fig1 , it shows the breaker 67 and its related mounting , the mirror image as that for breaker 53 . a groove 71 in the piston surface follows a rectangular path surrounding the area occupied by the breaker key 67 receiver slot , mirror image to fig1 . the groove 71 receives an o - ring 72 . this o - ring engages the top portion of key 67 k of breaker 67 to retain it in the piston . a groove 73 in the piston surface also follows a rectangular path surrounding the area of the breaker key receiver and retaining o - ring 72 . groove 73 receives o - ring 74 which serves as a piston - to - bore seal around the passageway 51 . a circumferential groove 75 in the piston receives o - ring 76 serving as a piston - to - bore seal around the entire circumference of the piston . referring back to fig5 , 10 and 11 , the post 53 p adjacent the distal end of the breaker 53 is useful to a person as a handle to grip when installing or removing the breaker 53 during servicing or cleaning the equipment . when the breaker 53 is in position in the passageway 47 , the post projects into the passageway as shown in fig5 and is accessible to a servicing person to pull the breaker out of the piston 44 . then the piston can be removed from the bore 49 if desired for servicing or cleaning . the post 53 p is also useful to push the breaker 53 in passageway 47 toward the piston and install the breaker key 53 k into the slot 44 s in the piston . while post 53 p is useful for installation or removal of a breaker relative to the piston , a screw driver or similar tool can be used if desired to facilitate displacement of the o - ring from groove 44 r ( fig9 and 10 ) or o - ring 72 from groove 71 ( fig1 ) which retains the proximal end of the breaker , to get the o - ring out of the way for insertion or removal of the breaker relative to the piston . so it is seen that these breakers are shaped in such a way that they provide for all the required functions of the parts : 1 ) a broad surface , preferably being substantially longer than it is wide to displace an optimum amount of the packed product along the path , 2 ) means , post 53 p for example , for easy insertion into and from the dispensing head during assembly and disassembly , 3 ) fool - proof assembly of the correct breaker into the correct side , since the two breakers are not identical , but are mirror images of one another , 4 ) proper retention of the breaker during all modes of operation , and 5 ) minimal disruption of the product flow path when the center valve assembly 46 is open for dispensing the two icy beverages from the two freezer cylinders and which beverages may have different characteristics in the nature of color or flavor or whatever differences are peculiar to them . a particular advantage of the illustrated embodiment of the current invention is a means to agitate this packed volume of ice crystals , such that displacement of the packed crystals occurs , allowing the mixed product from the main body of the freezing cylinder to flow through to the port of the dispensing valve . this enables the use of a relatively long flow channel to the center dispensing valve , allowing the centrally located beverage “ twist ” dispensing valve 46 and dispensing port 60 thereof to be located for maximum convenience for the user . a further advantage of this embodiment is the accomplishment of the agitation with a minimal number of parts and , therefore , optimum simplicity of the mechanism . while a preferred embodiment of the invention has been illustrated and described in detail in the drawings and foregoing description , the same is to be considered as illustrative and not restrictive in character . modifications that come within the spirit of the invention are desired to be protected .
a frozen beverage freezer machine is provided with two side - by - side freezer cylinders containing different flowable frozen beverage products . draw valves are provided to draw the beverages separately for dispensing separately from the two beverage freezer cylinders . an additional draw valve , generally centered relative to the freezer cylinders , is provided to draw beverages from the two cylinders simultaneously for dispensing a mix of the two beverages . clog breaker blades are coupled to the center draw valve assembly to inhibit clogging of passageways from the frozen beverage cylinders to the center valve , to facilitate reliable flow and mixing of the two beverages when the center valve is opened to dispense the mix into a user &# 39 ; s receiver cup .