Abstract:
An ice cooled beverage dispenser with a cold plate and a tubular ice bin liner has an upstanding rim around a periphery of the cold plate. The bottom edge of the liner is pressed into and seated to the rim, and an L-shaped bracket is fastened to the outside of the liner and to the rim for positive securement of the liner to the cold plate in a sanitary and leak proof manner; a method of making the beverage cooler is also provided.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention pertains to the construction of an ice cooled beverage cooler and to a method of making an ice cooled beverage cooler. 
     2. The Prior Art 
     Beverage coolers having cold plates, ice bins, and thermal insulation have been in commercial use since the turn of the century. Specific examples of these prior devices are disclosed in the following patents 
     1943938 : W A Haydel 
     2673005 : C A Brown 
     2871675 : R T Cornelius 
     4651538 : R E Bull et al 
     4678104 : J D Prichett 
     4470522 : C M Lents et al 
     Each of these patents discloses use of a cold plate with sealing of an ice bin to the top of the cold plate so that ice and melt water cannot seep under the cold plate and cause growth of algae, mold and the like. The devices shown in Brown and Cornelius have proven to be too costly to be economically viable. Haydel is unable to satisfy National Sanitation Foundation (NSF) criteria for approval. Bull and Prichett have rotocast plastic ice bins that are NSF approved but are plastic. There is a specific segment of the market which demands a stainless steel ice bin rather than plastic. Certain sanitation departments insist upon stainless steel ice bins, and certain soft drink components and fast food franchisers insist likewise. 
     OBJECTS OF THE INVENTION 
     It is an object of the present invention to provide a new method and apparatus wherein a metal liner is secured to a cast beverage cooling cold plate. 
     It is an object of the present invention to provide an ice cooled beverage dispenser with a cold plate and an ice bin having improved structure affixing the bin to the cold plate. 
     SUMMARY OF THE INVENTION 
     An ice cooled beverage dispenser has a cold plate, a tubular liner mounted atop the cold plate, an upright rim around the cold plate, a generally L-shaped bracket fastened to the liner and the cold plate, and a plurality of fasteners securing the flange to the plate. 
     In a beverage cooler having an ice cooled cold plate, the improvement of a tubular bin liner spaced above an upper ice supporting surface of the cold plate, with the liner being sealed and fastened to an upstanding rim around a perimeter of the cold plate. 
     A method of making a beverage cooler has the steps of providing a cast metal cold plate with an upstanding rim around the perimeter, inserting an upright tubular ice bin liner into the cold plate rim, seating the liner to the rim, and fastening the liner to the plate on the outside of the liner. 
     Many other advantages, features and additional objects of the present invention will become manifest to those versed in the art upon making reference to the detailed description and accompanying drawings in which the preferred embodiment incorporating the principles of the present invention is set forth and shown by way of illustrative example. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG 1 is an elevational view, in section, through the preferred embodiment of an ice cooled beverage dispenser according to the present invention; 
     FIG. 2 is a top plan view of the cold plate and ice bin of the structure of FIG. 1; and 
     FIG. 3 is a detailed elevational sectional view through lines III--III of FIG. 2. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     According to the principle of the present invention, an ice cooled beverage dispenser is provided as shown in FIG. 1 as generally indicated by the numeral 10. The dispenser 10 has an improved ice bin assembly, generally indicated by the numeral 12, which has a cold plate 14 and a tubular ice bin liner 16. 
     In the complete dispenser 10, the ice bin 12 is encased with an outer shell 18, a top breaker strip 20, and foamed in-situ thermal insulation 22. A drain fitting 24 extends out of the dispenser 10 from a recessed low point 26 of the upper surface 28 of the cold plate 14. The cold plate 14 has at least one and usually several internal cooling coils 30 directly under the upper surface 28. Each coil 30 has an inlet end 32 connectible to a source of beverage 34 and an outlet end 36 connectible to an appropriate dispensing valve 38. Within the volume jointly defined by the cold plate upper surface 28 and the liner 16 is the ice bin cavity 40 for containing a quantity of ice (not shown) to rest upon the cold plate 14 and provide cooling for beverage in and/or flowing through the cooling coils 30. All drain water from melted ice is voided out the drain fitting 24. 
     Important features of this invention are the method of making and the improved structure of the ice bin 12 as more fully shown and described with specificity in reference to FIGS. 2 &amp; 3. The cold plate 14 is preferably cast aluminum of commercially grade high purity and thermal conductivity. The cold plate 14 has an upstanding rim generally indicated by the numeral 42 which extends completely around an outer perimeter 44 of the cold plate. The rim 42 has an upward facing annular mounting pad 46 which extends completely around the cold plate 14. Within the mounting pad 46 is a liner confinement ring 48 having an inward facing surface which is spaced upwardly from the cold plate upper surface 28. The surface of the ring 48 is preferably tapered; specifically it is larger on top and smaller at the bottom and is tapered inward toward the cold plate upper surface 28. 
     A preferred angle of taper on the ring 48 is at least four degrees from top to bottom. Below the ring 48 and spacing the ring 48 up from the cold plate upper surface 28 is an inward extending fillet so extending completely around the cold plate 14 between the ring 48 and the upper surface 28. A preferred fillet 50 is 1/4 inch (6 mm) high by forty-five degrees with a sharp intersection to the ring 48 and a radiused intersection to the upper surface 28. A plurality of downward extending holes 52 are provided through the mounting pad 46 and into the rim 42. 
     The tubular liner 16 is preferably sheet metal and a preferred sheet metal is stainless steel sheet of about 0.020 inch (0.5 mm) thickness. The liner 16 is preferably formed of one piece of contiguous sheet with four 90 degree corner bends 54 as best seen in FIG. 2, and has a single upright seam 56 in one side where opposite ends of the liner 16 are abutted against each other. On the outside of the seam 56 is a metal backing strip 58 to which both ends of the liner 16 are spot welded to close the tubular liner 16. On the outside of each side of the liner 16 and adjacent a bottom edge 60 of the liner 16, is a generally L-shaped bracket 62 which extends around the outside of the liner 16. The L-shaped bracket 62 is preferably in four discrete sections, one on each side of the liner 16. The bracket 62 has an upright flange 64 extending upward and which is spot welded to the outside of the liner 16. The bracket 62 further has a generally horizontal and outward extending outboard flange 66 which is uniformly spaced upward from and above the liner bottom edge 60 all around the outer surface of the liner 16 at a constant vertical spacing 68. 
     In the assembly of the dispenser 10, the pre-assembled and spot welded liner 16 with the backing strip 58 and four brackets 62 is placed atop of the cold plate 14. A bead of sealant 70, such as silicone, is placed around the liner 16 at the convex corner between the outboard flange 66 and the outside of the liner 16 immediately above the liner bottom 60. The liner 16 and the bottom edge 60 fit inside of the mounting pad 46 and freely starts into tapered ring 48. However, the liner bottom edge 60 is larger than the bottom of the ring 48 and will not freely fall completely into the ring 48. A press (not shown) is utilized to compressively drive the liner 16 downward into the ring 48 until the liner bottom 60 abuts against the fillet 50 and the outboard flange 66 abuts against the mounting pad 46. Note that the height of the space 68 is identical to the height of the ring 48. The liner bottom edge 60 is a press-fit in the bottom of the ring 48 and provides a very tight and pre-loaded/pre-stressed metal to metal contact between the liner 16 and cold plate 14. During the pressing of the liner 16 into the cold plate 14, the sealant 70 is squished around to form a complete sealing layer between the outboard flange 66 and mounting pad 46, between the liner 16 and the ring 48, and between the liner bottom edge 60 and the fillet 50. A plurality of rivet type fasteners 72, preferably drive screws, are then driven through the outboard flange 66 and into the fastener holes 52 in the cold plate rim 42 to permanently secure the liner 16 to the cold plate 14 in a fluid tightly sealed configuration. The thus assembled ice bin 12 is then placed in the outer shell 18 and the thermal insulation 22 is formed in-situ around the cold plate 14 and up and over rim 42 and outboard flanges 66 and to the outside of the liner 16 for further securement and stiffening of the liner 16 to the cold plate 14. 
     In the use and operation of the ice bin 12 and dispenser 10, a quantity of ice, usually ice cubes, is placed in the ice bin cavity 40. As beverage flows through the coils 30, the ice pressing against the cold plate upper surface 28 is melted to cool the beverage. As the ice melts, the melt water is voided out the drain 24. The liner bottom edge 60 is spaced well upward of the cold plate upper surface 28 so that the level of melt water on the plate upper surface 28 is always well below the liner 10. The liner 16 is very rigidly secured to the cold plate 14 and there is little or no probability of the sealant 70 being disturbed. The pre-stressed compression of the liner bottom edge 60 in metal-to-metal contact with the ring 48 further enhances the redundancy of the sealant 70. The abutment of the liner bottom edge 60 to the cold plate 14 is very reliably sealed, very sanitary and easily cleaned. There are no crevices for growth of algae, bacteria or mold. 
     This new and improved dispenser 10 satisfies all known sanitation codes, user criteria, and it is economically viable and competitive. 
     Although other advantages may be found and realized and various modifications may be suggested by those versed in the art, it should be understood that I wish to embody within the scope of the patent warranted hereon, all such embodiments as reasonably and properly come within the scope of my contribution to the art.