Abstract:
A beverage container having an inner core and an outer shell, relatively rotatable such that a spiral groove in the inner core can be rotationally aligned with cooling flanges on the outside of the outer shell for cleaning, or rotated to close the cooling flanges, forming a cooling tube from the inside of the inner core to a drinking tube at the top of the container, thereby cooling a beverage that is drawn through the cooling flanges by radiating heat into the ambient environment.

Description:
REFERENCE TO RELATED APPLICATIONS 
   This application claims an invention which was disclosed in Provisional Application No. 60/766,787, filed Feb. 11, 2006, entitled “Never Too Hot Mug”. The benefit under 35 USC §119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The invention pertains to the field of hot beverage containers. More particularly, the invention pertains to hot beverage containers that cool the liquid prior to consumption. 
   2. Description of Related Art 
   When I have made hot coffee, hot chocolate, or hot tea in the past I have always been annoyed that I had to wait several minutes until my beverage cools down. What should be a pleasant experience is marred by the need to take scalding test sips, or alternatively risk waiting too long and resulting in cold coffee. Having found no reusable mugs with such features, I was challenged to find a way to both keep the beverage hot, yet still allow for comfortable drinking immediately. 
   U.S. Pat. Nos. 6,488,173, 6,471,085, 6,318,584, 6,176,390, 5,964,379, 5,961,004, and 5,253,780 display methods of cooling a hot beverage by separating a portion of a hot beverage into cooling chambers where the beverage cools at a more rapid pace. These methods do not allow for immediate and continuous consumption allowed by my invention. Furthermore, they are significantly more complex and expensive to use or manufacture, two of them even incorporating valve systems. 
   U.S. Pat. Nos. 7,021,490, D360,558, U.S. Pat. Nos. 5,054,631, 5,005,717, 4,830,204, D279,250, U.S. Pat. Nos. 4,442,948, 4,428,490, D269,659, U.S. Pat. Nos. 4,291,814, 3,332,567, 2,885,134, and 2,013,475 display combinations of straws and drinking vessels. However, these designs suffer from one or more of the following deficiencies: lack sufficient straw length to cool a liquid, the tubes are not designed to maximize cooling, the tubes are permanently enclosed making cleaning impractical, require disassembly to clean, the tubes are arranged in vertical loops requiring additional sucking before beverage is consumed, and are not designed to hold hot beverages. 
   U.S. Pat. No. 4,442,948 is similar to an embodiment of my invention, but does not allow cleaning without disassembly. The articles described in U.S. Pat. No. 4,442,948 require removal of the inner cup to expose the tubing for cleaning, which in addition to being an extra step, adds risk of losing a piece and rendering the whole mug useless. 
   SUMMARY OF THE INVENTION 
   A beverage container which draws hot beverage from the insulated interior, through a tube network along the exterior of the cup, up to the rim of the cup, thereby cooling the beverage that is sucked through the tube network by radiating heat into the ambient environment. The preferred embodiment consists of two parts, such that the insulated interior core can be rotated in relation to the outer cup resulting in either an enclosed tube which can be used to draw liquid from the interior of the cup as described above, or exposure of the cooling flanges for cleaning. 
   Through this design, one can have an inexpensive, reusable, and easily cleaned mug that allows immediate and continuous consumption of hot beverages. Furthermore, by allowing immediate consumption without cooling the entire beverage at once, the window of optimal temperature for consumption is expanded. Once the beverage cools to the point that the tube cooling system is unnecessary, the cup can be sipped from in a normal fashion. 

   
     BRIEF DESCRIPTION OF THE DRAWING 
       FIG. 1  shows a cross section of the invention in cleaning orientation, with the tubes open. 
       FIG. 2  shows a cross section of the invention in consumption orientation, with the tubes sealed. 
       FIG. 3  shows a view of the inner core of the invention. 
       FIG. 4  shows a cross section of the exterior cup 
       FIG. 5  shows an exterior rear view of the invention with the tip structure. 
       FIG. 6  shows an exterior view of opposite side of the invention from  FIG. 5   
       FIG. 7  shows a top view of the invention with tip structure. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The beverage container of the invention is designed to overcome the shortcomings described in the prior art. It is a drinking container formed from two main parts—an inner core ( 4 ), shown separately in  FIG. 3 , and an outer shell ( 10 ), shown separately in  FIG. 4 . The other figures show the assembled cup, made up of the inner core ( 4 ) inside the outer shell ( 10 ). 
   Referring to the figures, the first par of the container is an inner core ( 4 ) with an open top ( 20 ), an open (as drawn) or closed bottom ( 21 ), and side walls ( 22 ) enclosing a central chamber ( 23 ). The inner core ( 4 ) is roughly cylindrical with a long gap ( 6 ) spiraling down from the inner surface ( 31 ) of the side walls ( 22 ) through to the outer surface ( 32 ) of the side walls ( 22 ), from the top ( 20 ) to the bottom ( 21 ). At the bottom ( 21 ) is a large gap ( 5 ) on both sides of the core ( 4 ) connected on the sides ( 12 ) such that the bottom tubing is exposed regardless of whether it is in consumption or cleaning orientation. Preferably, the inner core ( 4 ) is made of insulating material 
   Optionally, one or more stabilizing rods ( 11 ) are attached to the interior wall ( 22 ) of the inner core ( 4 ) in order to hold the core together. This is not necessary if the insulation of which the inner core is made is constructed of sufficiently rigid materials. At the top ( 20 ) is a large tab ( 1 ) that extends over the rim of the cup. This allows for easy manipulation of how the interior core ( 4 ) is aligned with the outer shell ( 8 ). 
   The second main part of the invention is the outer shell ( 10 ). The outer shell ( 10 ) has an open top ( 25 ), a bottom ( 24 ), and walls ( 8 ), The walls are preferably insulated, enclosing a generally cylindrical central chamber ( 9 ) which is shaped and sized to tightly surround outer surface ( 32 ) of the inner core ( 4 ). 
   The walls ( 8 ) have non-insulated cooling flanges ( 7 ) spiraling up the walls to the open top ( 20 ) at the same rate as the gap ( 6 ) of the inner core ( 4 ), so that the flanges ( 7 ) and gap ( 6 ) can be aligned, as described in detail below. The flanges ( 7 ) are preferably divided into pairs ( 26 ) and ( 27 ) with the combined diameter slightly larger than gap ( 6 ) of the inner core ( 4 ), in order to present more surface area for cooling. Other arrangements with three or more divisions might be possible. As shown in  FIG. 5 , if the flange ( 7 ) is divided into two or more parallel cooling flanges, the cooling flange divisions ( 26 ) and ( 27 ) will preferably merge into one tube ( 2 ) at a point ( 14 ) immediately prior to reaching the rim of the mug ( 13 ). This tube ( 2 ) then protrudes above the top ( 20 ) of the container. 
   The outer shell ( 10 ) also has at least one handle ( 16 ) protruding from one side. This handle can either be molded as part of the outer shell ( 10 ) or can be attached from a separate piece. 
   The outer surface ( 32 ) of the inner core ( 4 ) and the central chamber ( 9 ) of the outer shell ( 10 ) are generally cylindrical and sized such that the inner core ( 4 ) fits tightly within the outer shell ( 10 ), but is free to rotate. In most applications it is likely that the inner surface ( 31 ) of the inner core ( 4 ) and the outside of the outer shell ( 10 ) will also be generally cylindrical, but other shapes would be possible within the teachings of the invention. In the context of this description, the term “cylindrical” will be understood to include cylinders with parallel walls and tapered cylinders as shown in the drawings. 
   Finally, at the top ( 25 ) of the outer shell ( 10 ) are two small tabs ( 3 ) protruding above the rim ( 13 ) and extending slightly toward the center of the mug, over the inner core ( 4 ). The tabs ( 3 ) serve to hold the inner core ( 4 ) within the outer shell ( 10 ) while allowing the inner core ( 4 ) to rotate relative to the outer shell ( 10 ) from a cleaning position ( FIG. 1 ) wherein the flange ( 7 ) is aligned with the gap ( 6 ), to a consumption position ( FIG. 2 ) wherein the flange ( 7 ) is aligned with the wall ( 22 ) forming a closed tube. If desired, the tabs ( 3 ) may be made small enough to allow the inner core ( 4 ) to be inserted into and removed from the outer shell ( 10 ) by the user, or they may be formed after initial assembly to be large enough to permanently lock the inner core ( 4 ) in place within the outer shell ( 10 ). 
   When aligned for consumption ( FIG. 2 ), tab ( 1 ) is moved to the consumption position ( 29 ). The cooling flanges ( 7 ) are sealed by the walls ( 22 ) of the inner core ( 4 ). When the user sucks at the tip ( 2 ), fluid is drawn from the exposed tubing section ( 5 ) at the bottom ( 24 ), through the sealed spiral flange ( 7 ) up to the tube ( 2 ) opening at the top ( 25 ). Along the way, the hot fluid radiates heat through the thin tubing into the surrounding air, such that the fluid is less hot when it reaches the mouth. 
   However, when tab ( 1 ) is moved to the cleaning position ( 28 ), the gap ( 6 ) of the inner core ( 4 ) is aligned with the outer shell&#39;s ( 10 ) cooling flanges ( 7 ). In this position, the cooling flanges ( 7 ) are completely opened to the interior ( 23 ) of the inner core ( 4 ), allowing for easy cleaning. The small section of tube ( 2 ) at the top is short enough to effectively be cleaned without opening fully. 
   The container of the invention can also come with a lid ( 30 ) to further keep the liquid insulated and hot until consumption and to minimize spills. 
   The container of the invention addresses the shortcomings noted in prior art in the following ways: 
   First, it allows immediate and continuous consumption of hot beverages. Upon pouring the hot beverage into the container, the user can suck on the end of the tube ( 2 ) at the top of the cup. The liquid is drawn out of the insulated inner core ( 4 ) into the external flanges ( 7 ) where it is immediately and continuously cooled by the ambient environment while in transit to the end of the tube ( 2 ) at the top of the container. There is no waiting for the beverage to cool down in a secondary chamber, and no need to go through a cycle of filling and emptying a cooling chamber. 
   Second, unlike other straw/cup designs the cup is made easy to clean as one simply twists the inner core ( 4 ) relative to the outer shell ( 10 ) to expose the tubing. No disassembly is required. 
   Third, since the invention is formed from two parts (the inner core ( 4 ) and outer shell ( 10 )) or three (if the handle ( 16 ) is attached separately) it is very cheap and easy to manufacture. No assembly is required aside from attaching a handle if that method is chosen. 
   Accordingly, it is to be understood that the embodiments of the invention herein described are merely illustrative of the application of the principles of the invention. Reference herein to details of the illustrated embodiments is not intended to limit the scope of the claims, which themselves recite those features regarded as essential to the invention. 
   LIST OF REFERENCE NUMBERS 
   
       
         1 . Tab 
         2 . Drinking tube 
         3 . Small tabs 
         4 . Inner core 
         5 . Larger gap at bottom of inner core 
         6 . Small gaps in inner core 
         7 . Cooling flanges 
         8 . Insulated wall of outer shell 
         9 . Central chamber of outer shell 
         10 . Outer shell 
         11 . Stabilizing rod of rigid material 
         12 . Material connecting the top portion of the inner core with the final ring 
         13 . Rim of container 
         14 . Point where the dual cooling flanges join single tube 
         16 . Handle 
         20 . Open top of inner core 
         21 . Bottom of inner core 
         22 . Walls of inner core 
         23 . Central chamber of inner core 
         24 . Bottom of outer shell 
         25 . Top of outer shell 
         26 . and  27 . divisions of flange ( 7 ) 
         28 . Tab ( 1 ) in consumption position 
         29 . Tab ( 1 ) in cleaning position 
         30 . Lid 
         31 . Inner surface of inner core 
         32 . Outer surface of inner core