the preferred embodiment of the invention is indicated in fig1 an elevation partly in section . the cooling container 10 comprises an inner wall 12 and an outer wall 14 , the inner wall 12 extending upwards to form an upper rim 16 of the container . the upper rim 16 has an annular depending flange 18 which is joined at annular junction 20 to an annular flange 22 extending upwardly from the outer wall 14 . the joining may be accomplished by any appropriate means , such as with a cyanoacrylate adhesive . in this preferred embodiment the inner wall 12 is generally fructo - conical in shape and the outer wall 14 is generally cylindrical in shape , forming an annular refrigerant cavity 24 which tapers or expands in volume from top to bottom of the container 10 . the inner wall 12 is cup shaped to form a receptacle 26 for receiving beverages . alternative combinations of shapes for the inner wall 12 and the outer wall 14 may be used , such as in fig2 and 3 . a resilient diaphragm 28 such as a cup - shaped unit is disposed on a base 30 which includes an ascending flange 31 connected by appropriate means , such as an adhesive , at annular junction 32 to the outer wall 14 . the diaphragm 28 may be made of any nonporous , flexible , reversibly deformable material such as rubber or plastics such as vinyl . the base 30 may include one or more air ports 34 to allow exhaustion of air from within the diaphragm cavity 36 upon compression of the cup - shaped unit 28 as the refrigerant in the refrigerant cavity 24 expands upon being frozen . the base 30 is provided with one or more refrigerant ports 38 to allow the refrigerant cavity 24 to be filled at time of manufacture . the refrigerant cavity 24 is filled by first inverting the cooling container 10 , which is completely assembled except for the insertion of plugs 40 . the plugs preferably are the length of the refrigerant ports 38 , so that each plug fills the port into which it is inserted without extending into the refrigerant cavity 24 . a refrigerant is introduced by means of a syringe or tapered nozzle through one or more of the refrigerant ports 38 , allowing any air within the refrigerant cavity 24 to escape through another refrigerant port or ports 38 . although a single refrigerant port 38 may be used both for introducing the refrigerant and for allowing air to escape , the filling process will be expedited if two or more ports are used . enough refrigerant is introduced into the refrigerant cavity 24 to fill same but not to extend into the volume described by the refrigerant ports 38 , which volume is to be filled by the plugs 40 , as aforementioned . preferably the refrigerant fluid is a liquid , such as water or an aqueous solution . after the refrigerant cavity is filled , the plugs 40 are inserted into the ports 38 , an appropriate adhesive being deposited therebetween to make the connection permanent . fig2 shows an alternative embodiment of the invention wherein elements corresponding to those of fig1 are identified by the same reference numerals . this embodiment is in the general shape of a bowl , in which the inner wall 12 generally fructo - conical in shape and upwardly concave for receiving foods in receptacle 26 . the outer wall 14 is generally cylindrical in shape , and the resilient diaphragm is in the general shape of an annular cylindrical cup - shaped unit 28 , forming an annular diaphragm cavity 36 . this embodiment is manufactured and filled with refrigerant in essentially the same manner as the embodiment of fig1 . fig3 shows another alternative embodiment of the invention in the general shape of a wine glass , with elements corresponding to those of fig1 and 2 designated by the same reference numerals . the inner wall 12 is generally hemispherical in shape and upwardly concave for receiving food or drink in receptacle 26 . the outer wall is generally fructo - conical in shape and upwardly concave , the resilient diaphragm is in the form of a cylindrical cup - shaped unit 28 and is upwardly convex , and the base 30 and the outer wall 14 are formed of a single piece of material at manufacture . this embodiment also includes a sub - base 42 which has an ascending flange 44 which is attached by an adhesive to base 30 at annular junction 46 . the sub - base 42 may form an air cavity 48 which is in communication with diaphragm cavity 36 through the air port or ports 34 . the embodiment of the invention in fig3 is filled with refrigerant and sealed at ports 38 by plugs 40 in the manner hereinbefore described with respect of fig1 . after the plugs 40 are attached , the sub - base 42 is then attached by an adhesive to the base 30 , completing the manufacture . fig4 shows a resilient diaphragm in the form of a bellows 28 &# 39 ;, with pleats or corrugations 29 along the circumference thereof , as an alternative embodiment of the diaphragm in the form of a cup - shaped unit 28 &# 39 ; of fig1 . the bellows 28 of fig4 is the functional equivalent of the cup - shaped unit 28 of fig1 is disposed on the base 30 in the same manner , and is likewise made of a nonporous , flexible , reversibly deformable material . when the resilient diaphragm takes the form of a bellows , expansion of the refrigerant causes compression of the bellows at corrugations 29 . it will be appreciated that the resilient diaphragm of fig2 and 3 may also be bellows rather than the cup - shaped units shown in these embodiments . such bellows may take the same general shape as the cup - shaped units in fig2 and 3 , with the addition of corrugations along the circumference thereof , in the same fashion as the bellows 28 &# 39 ; of fig4 . other configurations of the container of the invention may be made which utilize the concepts behind this invention . for example , a pitcher or mug may be formed by attaching a handle to the outer wall 14 in the embodiment of the invention as shown in fig1 . a plate may be formed by manufacturing the embodiment shown in fig2 such that the height of the outer wall 14 is small relative to the diameter of the base 30 . an &# 34 ; old - fashioned &# 34 ; drink glass may be formed from the embodiment of the invention shown in fig3 by manufacturing said embodiment without the sub - base 42 . various modifications and alternative embodiments of the foregoing disclosure may be made without departing from the spirit and scope of this invention .
a container for cooling and / or keeping cold beverages and / or foods . the container has a double - walled structure , forming a refrigerant cavity for holding a fluid , such as water , which , when frozen , produces cooling of the beverage or food in the container . a stress - relieving diaphragm accommodates the expansion of the fluid upon chilling to prevent breakage of the container .