US2177852A - Refrigerating apparatus - Google Patents

Description

5 Shets-Shet 1 \1 Illilllll llll- D. D. WILE REFRIGERATING APPARATUS Filed Jan. 2, 1936 INVENTOR fiv a, ATTORNEY Oct.

Oct. 31, 1939.

D. D. WILE REFRIGERATING APPARATUS Filed Jan. 2, 1936 5 Sheets-Sheet 2 IN'VENTOR JAL ATTORNEY Oct. 31, 1939. D. D. WILIE 2.177.852

REFRIGERATING APPARA'IUS Filed Jan. 2, 1956 5 Sheets-Sheet 3 lol INVENTOR BMD. (an

A ATTORNEY REFRIGERATING APPARATUS Filed Jan. 2, 1936 5 Sheets-Sheet 4 INVENTOR Z find/aw KM @ATTQRNEY Oct. 31, 1939. D. D. WILE I REFRIGERATING APPARATUS Filed Jan. 2, 1936 5 Sheets-Sheet 5 INVENTOR bum-be ze BY Maw/K 53% 4,414, ATTORNEY Patented Oct. 31, 1939 UNITED STATES REFRIGERATING APPARATUS Daniel D. Wile, Detroit, Mich, assignor to Detroit Lubricator Company, Detroit, Mich., a corporation of Michigan Application January 2, 1936, Serial No. 57,138

21 Claims.

My invention relates generally to refrigerating apparatus and more particularly to refrigerating apparatus of the type in which a liquid circulatory system is employed for conveying heat from a region to be cooled to a heat abstracting medium.

One of the objects of my invention is to provide a new and improved refrigerating apparatus having a liquid circulatory system for conveying heat from a region to be cooled to a heat abstracting medium and to provide an apparatus of this character in which the rate of circulation of the liquid, and therefore the rate of heat transfer, is governed in accordance with the heat con- 1 tent of the air in the region to be cooled to maintain the temperature of said region substantially constant.

Another object of my invention is to provide a refrigerating apparatus having a new and improved heat exchanger for maintaining a region to be cooled at the desired temperature.

Another object of my invention is to provide a new and improved cooling apparatus of the type having a liquid circulatory system for conveying heat from a region to be cooled to a heat abstracting medium and to provide an apparatus 'of this character having a new and improved heat absorbing means for absorbing heat from said region for transfer by the liquid to the heat ab- 30 stracting medium.

Another object of my invention is to provide a new and novel control means for systems of the above mentioned character and one which is sensitively responsive to the temperature of the 3 air in a region to be cooled for controlling circulation of the heat transfer liquid.

Another object of my invention resides in the provision of a new and improved supporting -means for supporting a solidified refrigerant medium and of a character such that the refrigerant medium is in good heat transfer relation thereto to obtain more efficient refrigeration.

Another object of my invention is to provide a new and novel sealing means for sealing a space 45 between two spaced walls from the exterior of said walls.

Another object of my invention is to provide a new, and improved sealing means for refrigerating apparatus for preventing the passage into a 5) food storage compartment of the gas of a solidified refrigerant medium which is disposed in the cabinet for abstracting heat from the food storage compartment.

In the accompanying drawings, to be taken as a partof thisspecification, I have fully and clearly illustrated my invention, 'in which drawings- Figure 1 is a view shown in perspective of my refrigerating apparatus, the cabinet of the device being brokenaway to show its construction and the arrangement and construction of parts and 5 devices associated therewith; I

Fig. 2 is a view shown incross section and taken along the line 22 of Fig. 1;

Fig. 3 is a view shown in cross section illustrating a modified form of the structure shown in 10 Fig. 2; 1

Fig. 4 is a top plan view of the cooling apparatus with parts thereof removed to show certain details of its construction and with portions of the cabinet walls shown to illustrate the preferred arrangement of the cooling apparatusin the cabinet;

Fig. 5 is a view shown partly in cross section and partly in elevation and taken along the line 5-5 of Fig. 4;

Fig. 6 is an elevational view of the cooling apparatus taken in the direction of the arrows 6,6 of Fig. 4 and having portions broken away to show its construction;

Fig. 7 is a view in perspective of the cooling g5 apparatus removed from the cabinet and having portions broken away to show its construction; Fig. 8 is a plane view shown in cross section and taken along the line 8-8 of Fig. 6; Fig. 9 is a detailed view taken along the line 9--9. of Fig. 5;

Fig. 10 is an enlarged view in cross section showing a detail of the cabinet construction;

,Fig. 11 is an enlarged detailed view shown in cross section; 1

Fig, '12 is a view shown in perspective of a modified form of a; refrigerant medium supporting member of .my apparatus, and i Figs. l3, l4 and 15 are similar views in cross section and showing modified forms of the con- 40 struction shown in Fig. 2.

Referring to the drawings by characters of reference and first to Fig. 1, my refrigerating apparatus includes a cabinet, theouter walls of which are preferably formed by a substantially 4'5 rectangular shaped metallic casing or container I having a bottom wall 2, side walls ,3, end walls 4 and a removable top wall or cover 5. The cover 5 preferably has a depending flange 6 which fits or telescopes over an. u per end portion of the side and end walls but which preferablydoes not have a sealing fit with the walls, for a purpose which is hereinafter described. The inner walls of the cabinet are preferably formed by a metallic, substantially rectangular shaped removable casing or container I positioned concentric relative to the outer container I and having a bottom wall 8, end walls 9, side walls I0 and a removable top wall or cover II. The inner walls of the container I define the region to be cooled, or food storage compartment, as at I 2, and the inner container is made suiflciently smaller than the outer container or casing I so that their corresponding walls will be spaced for containing therebetween a suitable amount of heat insulating material for insulating the compartment I2 against the entrance of heat. The heat insulating material employed between the bottom, side and end walls of the containers, as at I3, is preferably of a fibrous character such as the material commonly known as kapok while the insulating material employed between the removable covers 5 and II is preferably a thick sheet or board of coarse grade cork, or so-called rock cord, as at I4, and which may rest on the removable cover II, as shown. In the outer container I, adjacent its bottom wall 2, there is provided a supporting structure for the inner container I which supporting structure may comprise wooden cross members I5 on which the bottom wall of the container I rests, and which cross members may in turn rest on longitudinally extending wooden supporting members I 6. Fixed to the cross members I5 there may be provided upright wooden pieces I1 which serve as abutment or stop members to facilitate proper or concentric positioning of the inner container I relative to the outer casing I and to prevent lateral movement of the inner container.

As is more clearly shown in Fig. 10, the upper end of the inner container I is formed having an outturned, horizontally disposed continuous or annular flange I8 on which the removable cover II rests. At its outer edge the outturned flange I B has downwardly directed flange portions 20 which extend along the sides and ends of the rectangular shaped container I and which are preferably not joined at the corners of the container. The cover II is formed having upturned flanges 2I which extend along its sides I and ends and which, like the flanges 20'of container I, are not joined at the comers. The flanges 20 which extend along the sides and ends of container I lie or extend in the same vertical planes with the corresponding and oppositely directed flanges 2| extending along the side and end edges of the cover I I. Between the cover II and the outturned flange I8 of the container I there is provided a gasket 22 which is preferably a continuous strip of resilient material such as rubber. The rubber gasket 22 may be tightly clamped between the cover II and flange I8 by removable clamping strips or keys 23 which engage the oppositely directed flanges 2B and 2I and hold the rubber gasket under compression to seal the food storage compartment I2. The clamping strips 23 are preferably metallic strips having their longitudinal edges bent over and inwardly or toward each other, as at I9, with the bent portions being spaced from the strip proper to provide channels for receiving the upturned flanges 2I and the downwardly directed flanges 20 of the cover and container, respectively. It will be understood at this point that the side and end flanges 20 of the container I, and the side and end flanges 2i of theicover II are not joined at their respective corners so that the ends of the clamping strips 23 can be fitted over the exposed end edges of the flanges and be slid into position. In c a pi g the cover II to the containe I the cover may be drawn toward the container flange I8 and the rubber gasket 22 held under compression while the ends of the clamping strips 23 are fitted over the flanges 20 and 2I and slid into position, the rubber gasket being held under a high compression force by the clamping strips so as to hermetically seal the compartment I2.

The cooling apparatus is disposed in the inner container I, intermediate and in spaced relation to the end walls 9 thereof, and divides the interior of the container or compartment I2 into two sections or compartments for the storage of foodstuff. In the present instance, the cooling apparatus is so constructed that it is removable as a unitary structure from the container I and this cooling apparatus includes a heat exchanger which is exposed to and absorbs heat from the air of compartment I2, and which heat exchanger is preferably in the form of a substantially rectangular shaped metallic housing or casing 24, Fig. '7. Preferably the housing 24 is constructed of sheet metal having a bottom wall 25, walls 26 and 21 which may be termed the side walls of the housing, and walls 23 and 29 which may be termed the front and rear walls, respectively, of the housing. The side walls 26 and 21 extend substantially parallel with the end walls 9 of compartment I2 and have outturned flanges 30 which extend along the side and bottom edges of the walls. The front, bottom and rear walls of the housing 24 are formed, in this instance, by a single sheet of sheet metal which'is of general U-shape as seen from the sides of the housing, and which wraps around or conforms in shape to the outer contour of the outturned flanges 30 of the spaced side walls 26 and 21. The U-shaped sheet of metal may be welded or otherwise suitably secured to the outturned flanges 30 of the side walls 26 and 21.

In the outturned flanges 30 of the housing side walls 26 and 21 there is provided a plurality of spaced apertures which align with other spaced apertures provided in the front, bottom and rear walls of the housing 24, exteriorly thereof and which aligned apertures are provided to receive screws 3| by means of which to rigidly secure the cooling apparatus to the walls of the cabinet. The rear wall 29 of the housing 24 is preferably disposed adjacent one of the side walls ID of compartment I2 and is preferably spaced therefrom by non-heat conducting tubular spacer members 32 which receive the screws 3 I. A relatively large space is provided between the front wall 28 of housing 24 and the adjacent side wall I 0 of compartment I2, and extending between these walls are space removable wall means or partitions 33 and 34 which cooperate with walls 28 and I0 and portions of the top and bottom walls of compartment I2 to provide an enclosed space or compartment 35, Fig. 4. The compartment 35 is suitable for the storage of package goods to be refrigerated. The partitions 33 and 34, and which extend substantially between the inner top and bottom walls of the cabinet, are each preferably formed having vertically extending side flanges provided with spaced apertures to receive the screws 3I for securing the partitions 33 and 34 to housing 24 and to the adjacent wall III of compartment I2. Tubular, non-heat conducting spacer member 32, which receives the screws 3|, may be provided between the partitions 33 and 34 and housing 24, and between the partitions and the wall II) of compartment I2 to prevent transfer of heat therebetween by conduction.

. The lower ends of the partitions 33.and 34 preferably terminate above the lower wall of compartment. I2 and partition 34 is preferably provided with a plurality of apertures 35 and partition 33 with a cut out portion 31 so that air can circulate more freely throughout the interior of the cabinet.

The cooling apparatus rests on the bottom wall 8 of the compartment l2 and preferably a sheet of heat insulating material such as cork, as at 40, shown in Figs. 5 and 6, is provided between the metallic bottom wall 8 of compartment I 2 and the metallic bottom wall 25 of housing 24 to prevent conduction of heat therebetween. The housing 24 may be secured to the bottom wall 8 by screws 3| which extend through aligned apertures in wall 8, the horizontal or bottom portion of the continuous flanges 30, and the bottom wall 25 of housing 24, the screws extending upwardly above the wall 25 to receive nuts 4|. In order to rigidly mount the cooling apparatus in the cabinet, I provide a supporting member 40 of rigid material, between the bottom wall 25 of housing 24 and the inner bottom wall 8 of the cabinet, the supporting member 40. preferably being in the form of a frame which surrounds the cork insulation 40. The supporting member 40 may be constructed of wood, or other rigid material having a high resistance to the conduction of heat, and is providedwith apertures to receive the screws 3|. When the nuts 4| are tightened, the cork insulation 40 will be compressed until housing 24 seats on thewood frame, the frame also serving to prevent peripheral expansion of the cork. The housing 24 has an open upper end which is disposed adJacent the underside of the top wall I l of compartment l2, the side, front and rear walls of housing 24 having inturned flanges at their upper edges which are preferably welded together at the corners of the housing to provide a continuous flange or upwardly facing seating surface 42. Disposed between the continuous flange or seating surface 42 and the underside of the top wall ll of compartment l2 there is provided a gasket 43 which is preferably a continuous, rectangular shaped strip of compressible material, such as rubber. In the top wall ll of compartment l2 there is an openingof preferably substantially rectangular shape which registers or is in alignment with the upper open end of housing 24, and this opening is preferably defined by an upturned continuous flange 44. Figs. 5 and 11. 1 As is more'clearly shown in Fig. 11, the rubber gasket 43 is clamped and held under compression, between the top wall 'll of compartment i2 and the continuous flange 42 of housing 24, by'clamping strips 45. The 'clamping strips 45 have their upper longitudinal edges curled or bent outwardly and downwardly, as at 46, for fitting over or receiving thuptumed flange 44, and have outturned longitudinally extending flanges 41 along their lower edges which position against the underside of the flanges 42 of housing 24. In its inert form, the rubber. gasket 43 is of such thickness that it must be compressed before the lower flanges 41 of the at each end of each clamping strip to keep the strip in place.

Disposed within housing 24 and concentric therewith is a container or ice bunker for containing a solidified refrigerant medium such as carbon dioxide, which is designated generally by the numeral 5|, Fig. 6. The construction of the ice'bunker 50 preferably includes a metallic, substantially rectangular shaped open ended sleeve or tubular member which forms the side walls 52 and 53 and end walls 54 and 55 of the bunker 50. The lower end of the sleeve member is formed having an inturned continuous flange or seating surface 56 which seats on one leg 51 of an L-shaped platelike supporting member. The leg 51 forms the bottom wall of the bunker 50 and has bent portions or corrugations, as at 58, providing an extended surface on which the carbon dioxide rests. By having an irregular or corrugated supporting surface for the carbon dioxide, the carbon dioxide will have a larger surface area in contact with its support than it would have if a flat support were employed. The I extended or corrugated surface provides for increased pressure on the carbon dioxide and good heat exchange relationship between the carbon dioxide and its support. 51 and'the continuous flange 56 around the lower end of the bunker-50 may be provided with a plurality of aligned apertures for receiving rivets 5!, or other suitable attaching means for securing the sleeve member to the bottom wall of the bunker, or leg 51 of the L-shaped supporting member. The L-shaped plate or supporting member is preferably substantially as wde as the'bunker and is constructed of metal) having a high degree" of heat conductivity, such as copper. The L-shaped supporting member has a vertically extending leg in the form of a plate Gil which extends upwardly from the leg 51 and which is disposed between the end wall 55 of the bunker and the front wall 28 of housing 24. In the housing 24 and resting on the bottom wall 25 thereof is a reenforcing member which may he a w oden board, as at 6|, and sup orted on the board Bl there is preferably provided lon itudinally extending supporting members 62 and cross members 63 on which the bunker 50 rests and which space the bottom wall of the bunker from the bottom wall of housing 24. Heat insulating The leg or bottom wall material and preferably so-called kapok, is provided between the outer walls of the bunker 5'1 and the inner wallsof housing 24. as indicat d at 64. Fig. 4. for insulating the walls of the bunker 5'! f om the walls of housing 24,

The bunker 50 is preferably rigidly mounted within the housing 24 in anv suitable manner. such as by means of tie rods 65, the e preferably being four of such rods. as shown. The tie ro s 65 preferably have threaded end portions for receiving nuts 66. the threaded end portions of the rods preferably extending through apertures in brackets 51 which may be welded or otherwise suitably secured to the bunker and which are preferably located adjacent its corners and at its upper end. Brackets 63 may be welded to the inner side walls of housing 24 adjacent its lower end, and have outturned flanges provided with apertures for receiving the lower ends of the rods 55 which may be formed having hooked ends, as shown. Preferably the brackets 61 and 68 are located so that the rods 65 extend at oblique angles relative to the walls of the bunker 50, so that the bunker is held down against its wooden supporting members and also held against lateral movement in any direction.

A liquid circulatory system is provided for transferring the heat absorbed by the walls of I housing 24 to the heat abstracting medium, or

' together.

carbon dioxide 5!, and includes a header member, designated generally by the numeral I0. The header member ID is preferably a casting formed of a metal having a high degree of heat conductivity, such as copper, and the header member is carried or supported by the vertically extending leg or extension 69 of the bottom wall of bunker 50. The header member I9 is thus in good heat conductive relation with the refrigerant medium in the bunker 50 through the copper L- shaped supporting member. The header member ID is disposed withinhousing 29 intermediate its side walls 26 and 21, and in the space between the end wall 55 of the bunker and the front wall 28 of housing 24. The header member I has a lower, hollow end portion II which, in the present instance, is rectangular. in form and which defines a vertically extending chamber or passage I2 for liquid. Spaced, apertured bosses I3 are formed on the tubular portion II to receive screws I4 which thread into threaded apertures provided in the vertically extending leg or plate 69 of the 'L-shaped supporting member. The header I9 may thus be secured to the L- shaped supporting member in good heat conductive relation therewith. In addition to the screws I I, the header I9 and its supporting member may be soldered, welded, or otherwise suitably secured The tubular portion II extends up- Wardly and has an upper end portion I which projects partway into an integral and relatively larger tubular portion 79 whose inner wall is in spaced relation to the outer wall of portion I5 to provide an annular chamber I9 therebetween. Threaded into the upper end of the tubular portion I5 there is an open ended, vertically adjustable, tubular shaped extension TI. The adjustable extension II extends upwardly through the relatively larger tubular portion I6 and its top edge I9 constitutes the high point or elevated portion of the liquid circulatory system and which may be termed an overflow edge or dam. The relatively larger tubular portion I9 of the header member I9 extends upwardly and leads or opens into a hollow, substantially rectangular shaped casing 80 which is preferably integral with tubular portion I5 and which is disposed within and adjacent the upper end of housing 24. The casing 89 has a top wall 8I,- side walls 82 and 93, end walE 89 and 85, and a bottom wall 86. The tubular portion It opens through the bottom wall 86 of casing 89 intermediate its end walls 84 and 85, the latter walls being disposed toward the side walls 2'I and 26, respectively, of housing 24.

The side walls 29 and 21 of housing 29 are each provided with duct means 99 which constitute portions of the liquid circulatory system and through which a heat absorbing liquid circulates in good heat conductive relation with the metallic heat absorbin walls 26 and 21. The ducts 88 may be provided, by welding or otherwise suitably securing, a ribbed sheet of metal or plate 89 to each of the side walls 26 and 21, the plates 89 preferably being fixed, as shown, to the inner surfaces of the side walls. In the present instance, the plates 89 are each formed having a continuous rib spaced from their outer peripheral edges and which forms a substantially rectangular shaped passage, the continuous rib comprising spaced, substantially horizontally extending upper and lower rib portions 90 and 9I, respectively, connected by spaced, substantially vertically extending rib portions 92 and 93. The plates 89 are also preferably formed having a plurality of spaced, vertically extending ribs 99 disposed between the vertically extending ribs 92 and 93, and which connnect or intersect the upper and lower substantially horizontally extending ribs 99 and 9|. The ducts 88 extend along the side Walls 26 and 21, substantially from front to rear of the housing 24 and are preferably located near its upper end where the housing is relatively warmer. The substantially horizontally extending upper and lower ribs 90 and 9I converge toward each other and the vertically extending ribs 94 decrease in height from the front to the rear of housing 24, as seen in Fig. 6. The upper rib is preferably disposed at an angle extending upward toward the header casing 80 so that in the event air or other gas should get into the ducts, it will escape to the header casing 80.

The duct means 88 and the header member I9 constitute heat exchange portions of the liquid circulatory system, or systems, and are connected by flow passages which preferably comprise upper, oppositely extending conduits or pipes 95 and lower oppositely extending conduits or pipes 96. The header member ID is provided with oppositely disposed inlet passages 96 and 91 which lead into the annular chamber I9 in the upper or relatively larger portion I6 of header I9 and which passages are preferably defined by externally extending tubular bosses 98 and 99, respectively. End portions of the upper conduits 95 extend or telescope into the hollow bosses 98 and 99 and are preferably secured and sealed therein by a suitable sealing material, such as solder. The other ends of the upper conduits 95 are connected to the continuous ducts 88 adjacent the front wall 29 of housing 24 and preferably at the corners or junctions of the duct portions 90 and 92, as shown. At these corners or junctions of the continuous ribs there may be provided outlet passages defined by tubular extended portions I90 which receive the outer end portions of the conduits 95 and in which the conduits are preferably sealed and secured by a suitable sealing material, such as solder. The header member ID is provided with oppositely disposed outlet passages NH and I92 which lead out of the chamber I2 of header Ill and adjacent the bottom thereof. The outlet passages IM and I02 are preferably defined by externally extending tubular bosses I03 and I04 formed integral with the header 'III and which receive ends portions of the lower connecting conduits 96, the end portions of the conduits 96 being sealed in the tubular bosses I03 and I04, such as by solder. The outer ends of the lower conduits 96 may be connected to, and sealed and secured in tubular bosses I95 formed out of the metal of the continuous ribs at the lower corners thereof and adjacent the front wall 29 of housing 24.

A quantity of expansible-contractible liquid, such as acetone, is contained in the liquid circulatory system and flows over the high portion or overflow edge I8 at a rate depending upon the volume of the liquid, which in turn is governed by the temperature of the air .in compartment I2. Circulation of the liquid in the circulatory system is due to the liquid in the header chamber I2 having a greater density than the liquid in the ducts 88, which is caused by a corresponding difference in temperature between these portions of the system. Preferably the upper conduits 95 and also the lower conduits 86 are angularly disposed relative to the header member I8 and extend downwardly to the header from the ducts 88. The lower conduits 96 are preferably angularly disposed so that the liquid will not flow by gravity from the header to the ducts 88 while the upper conduits 95'are angularly disposed so as to induce flow of liquid therethrough into the upper chamber of the header longitudinally of and substantially coextensive with the chamber 12.

In order to facilitate the transfer of heat from the air of compartment I2 to the liquid circulating through ducts 88, I provide each of the side walls 26 and 21, in this instance, with a plurality of plate members I86- which overlie the ducts 88 in good heat transfer relation with the liquid therein and which are preferably constructed of copper, or other suitable material which has a low resistance to the conduction of heat. The plates I86 are preferably fixed to the outer surface of the side walls 26 and 21 and may be welded, soldered or otherwise secured thereto., In the present instance the plates are rectangular in shape and are arranged so that they extend vertically with their adjacent side edges preferably in abutment and with their upper ends disposed adjacent the upper end of housing 24 where the temperature is relatively high. Each of the plates I86 is formed having oppositely disposed side flanges I86 which extend outwardly from the side walls 26 and 2 1, and preferably these flanges I86 are formed out of the plates and only at their upper end portions with the lower ends of the flanges terminating adjacent the upper duct portion 88. By this arrangement the lower end portions of the plates I86 completely cover that portion of each side wall overlying the ducts 88 while the upper end portions have spaced flanges or extended surfaces I88 which constitute fins and which are located adjacent the warmest part of the housing 24. Air circulating in compartment I2 will engage the fins I86 and its heat will be transferred thereto, from whence the heat will be conducted downwardly by the plates I86 to the heat absorbing liquid passing through the ducts 88.

The ducts 88 are preferably connected to the casing 88 of the header member by conduits I81 so as to vent the ducts and equalize pressure throughout the liquid containing system. The

end walls 84 and of the header casing 88 may be provided with. apertures in which end. portions of the conduits I81 may be secured and sealed, such as by solder, while end portions of the other ends of the conduits I81 may be secured and sealed in tubular bosses I88 formed out of the duct walls. Preferably the tubular bosses I88 are located, as shown, at the junctions of duct portions 98 and vertical duct portions 92, which points are the high points of the duct system. The conduits I81 are preferably constructed of a material having a high resistance to the concooperate to form the chamber I25.

duction of heat so as to prevent transfer of heat by the conduits from the ducts 88 to the header casing 88.

In the top wall 8| of the header casing 88 there is provided an aperture II8 through which the expansible-contractible liquid is introduced into the liquid containing system and which aperture is preferably in alignment with the adjustable extension member 11 of the header 18. The aperture H8 is internally threaded, in this instance, to receive an externally threaded tubular member or nut III which is also internally threaded for receiving one end of a filler tube structure. The filler tube structure may comprise a central tubular member II2 having portions of its opposite ends sleeve fitting or telescoping into tubular end members H3 and H4, the end member I I4 being externally threaded for screw threading into the internally threaded nut III. Preferably the opposite ends of the central tubular member II2 are sealedand secured in the end members H3 and H4, such-as by solder or other suitable means. The filler tube extends upwardly from casing 88 through aligned apertures in the cork insulation I4 and outer cover 5 and preferably projects slightly above the outer wall of cover 5. The upper tubular end member H3 is preferably internally threaded for receiving an externally threaded closure plug I I5 which, in the present instance, is provided with two spaced recesses H6 ,in its outer end to receive a key (not shown) but which may be constructed having two prongs for insertion in the recesses 6 for engaging and turning the plug. The adjustment or extension member I1 is provided adjacent its upper end with a laterally extending pin II8 whose opposite ends may be supported in the vertical wall of member 11 and the pin H8 is provided for cooperation-with a pronged key (not shown) by means of which the extension member may be vertically'adjustedas desired. The closure plug II5 may be removed and the key for rotating the extension member inserted longitudinally through the filler tube for engaging the cross pin I I8 and rotating member I1 and in this manner the extension member may be adjusted from exteriorly of the cabinet. In the side wall 83. of header casing 88 there is provided an aperture in whichds positioned a plug I22 whose inner end portion projects into the casing 88 above theupper end of extension member TI and serves as a stop therefor to limit upward movement of the exten sion 11.

Disposed within the compartment I2 and sensitively responsive to the temperature of the air therein there is a control means for controlling circulation of the liquid in the circulatory system and this control means includes a container or chamber I25. The chamber I25 is formed between the partition 33 and a sheet of metal, or plate I26, which have oppositely directed indented portions or ribs I21 and I28, respectively, which The plate I26 and partition 33,may be welded or otherwise suitably secured together so that the chamber I25 will be fluid tight. The chamber I25 is in communicationwith the header member 18 by means of a conduit ortube I38 which has a portion of one end sealed and secured in an aperture in the lower end of chamber I25 and has an end portion of its other end sealed and secured in an aperture I3I in the bottom wall of the header site end portions of the conduit I30 to the wall of chamber I25 and bottom wall of the header III. The chamber 525 contains a large body of the expansible-contractible fluid which completely fills the chamber and which, in accordance with changes in its heat content, varies in volume and in so doing varies the volume of the liquid in the liquid circulatory system to control the rate of circulation of the liquid therein. Preferably the chamber I25, like the ducts 88, is vented to the header casing 80 so that the pressure throughout the liquid containing system will be equalized, and to this end a conduit or tube I33, preferably of low heat conductivity, may be employed. The conduit I33 may have one end sealed and secured by solder in the end wall 84 of the header casing 80 or at some point preferably above the liquid level in the header, and have its other end sealed and secured by solder in an aperture in the wall of chamber I25 preferably adjacent the upper end of chamber I25, as shown. In the wall of chamber I25 and at its lower end there is preferably provided an aperture through which a tubular member I34 extends and projects into chamber I25. The tubular member I34 may be fixed to the wall-of chamber I25 in any suitable manner such as by securing the wall in an external annular groove in the member I34, as shown. The tubular inember I34 may be formed having an internal, outwardly facing shoulder providing a seat for the conically formed inner end of a screw I35 for closing the opening through the tubular member. By removing the screw I35 the liquid in chamber I25 and also the liquid in the liquid circulatory system can be drained therefrom.

In the outer cover 5, cork insulation I4, and the inner cover or top wall I I of compartment I2 there are provided aligned openings which are located above and overlie the package compartment 35 and through which access may be had thereto. The openings in the covers and II are preferably rectangular, or conform in shape 1 to the shape of compartment 35. In order to seal the space between the covers 5 and II from compartment I2 and the exterior of the cabinet, I provide an open ended tubular member I36 of rectangular form which is positioned concentric with the openings in the covers and which extends therebetween with one end attached to the outer cover and the other end attached to the inner cover. The opening in the outer cover 5 is defined by an upwardly extending continuous flange I31 and the opening in the inner cover I I is also defined by an upwardly extending continuous flange I36 which, however, has a rebent, inwardly disposed continuous portion I36 to provide a downwardly facing channel. The sealing member 136', the construction of which is more clearly shown in Fig. 2, is preferably molded of a resilient material, such as rubber, and the upper end thereof is preferably formed having an external annular flange portion or bead I40 having a downwardly facing shoulder or seating surface I M which seats on the outer wall of cover 5. Preferably the downwardly facing seating surface or shoulder I has an inwardly facing portion spaced from the outer wall of the tubular member to provide an annular groove or recess I42 for receiving the upturned continuous flange I 31 of the outer cover 5. The lower end of the tubular sealing member I36 is formed having an outwardly extending continuous flange-like portion or bead I43 which positions in the continuous channel formed by the upturned flange I38 and its rebent portion I39, the portion I43 being spaced from the outer wall of the tubular member to provide an upwardly facing annular recess I44 for receiving the depending-or rebent flange portion I39. Preferably the upper end of the rubber tubular member I36 is rounded or has a convex surface around its periphery, as at M5, and in this upper portion of the tubular sealing member I36 there is preferably embedded a rigid, metallic, rectangular shaped reenforcing member I46 for giving greater rigidity to the upper end of the rubber sealing member I36. The reenforcing member I46 preferably conforms in shape to the upper end of the tubular member I36 and has an outwardly curved flange portion I41 and a straight portion I48 which extends downwardly partway along the sides of the tubular member. The rubber tubular member I36 is so made that it must be stretched or elongated from its inert form in order to position its opposite ends over the upturned and downturneti flanges I31 and I 39, respectively, of the covers 5 and I I so that when in position the member I36 is under tension and its opposite end flanges are held tightly against the opposite walls of the covers to hermetically seal the space therebetween from the compartment I2 and the exterior of the cabinet. The convexly formed continuous-upper end of the tubular member I36 provides a resilient seat for supporting a removable cover I50 which is also preferably constructed of rubber having tapered side edges I 5I which fit within the upper end of the tubular member and engage portions of its wall to seal the interior of compartment I2 from the exterior of the cabinet. If desired, instead of embedding the reenforcing member I46 in the rubber tubular member I36, as shown in Fig. 2, the reenforcing member may be folded to the outer upper end of the member I36, as shown in Fig. 3. In the construction shown in Fig. 3, the reenforcing ring I46 provides a metallic seat for the cover I56 besides serving to increase the rigidity of the tubular member I36 at its upper end.

In the outer cover 5 and in the cork insulation I4 there are provided aligned openings which overlie or are in alignment with the upper open end of the bunker 50 and through which access may be had to the interior thereof, the openings preferably being rectangular in shape or substantially the same shape as the upper open end of the bunker. The bunker 50 has upper end portions of its side and end walls bent or offset outwardly, as atv I54, and rebent inwardly, as at I 55,

to provide downwardly facing channels along Positioned concentric tubular sealing member. I51 which extends therebetween and which may be the same in construc-,

tion as the sealing member I36 previously described. The tubular sealing member I51, and which is preferably rectangular in shape to conform to the shape of the bunker-50, has its lower end formed having an externally extending annular flange portion or bead which positions in the channels formed by the rebent flange portions I55 and which has an upwardly facing annular groove or recess to receive the rebent flange portions I55 which provide a holding means for i receiving the upturned flange I58 of cover 5.

,portion I10.

Seated on the upper end of the tubular member I51 there is a cover I62 which may be similar in shape and construction to the cover I50. To provide a good seal between the cover I62 and its seat, I provide a clamping means for tightly holding the cover I82 against its seat and, in the present instance, this clamping means includes a metallic strip "53.. Intermediate its ends, the clamping strip I63 is preferably provided with a downwardly extending intended portion I65, the underside surface of which engages the upper face of cover I62 when the clamping strip is in operative position. One end portion I66 of the clamping strip I63 projects beyond the edge of the cover I62 and is formed having a downwardly disposed bent or ofiset portion I61 which has a rebent portion I68 disposed below and in spaced relation to offset portion I61. In the present instance I employ the closure plug II5 of the filler tube for securing one end of the clamping strip I63. The rebent portion I68 of the clamping strip may be provided with an aperture for receiving the shank of the closure plug, the clamp ing strip being secured or held between the head of the closure plug and the upper end member II3 of the filler tube. other end of the clamping strip .I63 has an offset portion I10 which is disposed below the strip proper and which has an aperture therein for receiving a lug "I which is fixed to the wall of the cabinet. The lug "I has a laterally extending aperture in which may be positioned apin I12 of sufficient length so that it projects beyond the lug to engage the upper face of the clamping strip offset When the. Pin is in the position shown, the clamping strip I63 is held under tension with its extended bearing portion engaging the upper face of the cover I62 to urge the cover tightly against its seating surface. When it is desired to remove the cover I62, the pin I12 is first removed after which the clamping strip I63 may be moved to one side or pivoted about the closure plug until it is out of the way.

The type of cabinet shown is suitable for the storage of ice cream in cans, as at I15, and in the top wall orouter cover 5 of the cabinet there is provided a plurality of hand hold openings through which access maybe had to the cans I15. In the present instance there are four of such hand holds with two leading into the compartment I2 each side of the cooling apparatus. The hand holds are each provided by providing aligned apertures in the outer cover 5, cork insulation I 4, and inner cover II, these apertures being circular in shape, in the present instance. Each of the hand holds is provided with an open ended, tubular, resilient sealing member I16 which is positioned concentric with the circular apertures in the outer and inner covers and extends therebetween to seal the space between the outer and inner covers from the compartment I2 and from the exterior of the cabinet.

The tubular sealing members I16, except for be-.

ing cylindrical in shape, are constructed and attached to the outer and inner covers in the same manneras the tubular members I36 previously described. I I

In Fig. 12 there is shown another and preferred form of supporting member for supporting a solidified refrigerant medium in good heat transfer relation with the header of a, "efrigerating apparatus of the character described. The supporting member, and which is designated in general by the numeral I is also L-shaped and has a vertically extending leg or plate portion I8I for contact with theheader of the system and has a horizontally extending leg or plate portion I82 on which the refrigerant medium rests. The supporting member I 80 differs from the previously described supporting member in that the corrugations, as at I83, extend longitudinally of the leg I82 instead of transverse thereto. The corrugations preferably extend longitudinally of the horizontal leg I82, for whenso positioned they do not increase the actual length of the leg I82 as much as it is increased when they extend transverse, or across the leg or plate portion I82. As a result, a more rapid transfer of heat from the header to therefrigerant'medium is obtained through the relatively shorter leg I82 than through the relatively longer leg 51. of the previously described supporting member.

In the'form of cabinetconstruction shown in Fig. 13, the construction includes a number of vertically extending supports, of which one is shown at I85, the supports I85 preferably being constructed of wood or other suitable material having a high resistance to the conduction of heat. A cover I86 rests on the upper ends of the supports I85 and between this cover and an inner cover (not shown) but which may be like the cover II previously described, there is preferably provided suitable heat insulating material, as at I81. The cover I86 mayhave a plurality of openings therein for access to the in? terior of the cabinet and each of these openings may be defined by a downwardly extending continuous flange I88 having a spaced, rebent portion I89 providing an upwardly facing channel. As shown, the supporting member I85 is preferably positioned in abutting relation with the outor surface of the continuous flan e or as close v to the opening as possible and this supporting member I85 may be in the form of a partition or continuous wall means and completely surround the flange I88 in telescoping relation thereto. A tubular shaped sealing member I90 which is' preferably of rubber has an external continuous flange at one end whichpositions in the upwardly facing continuous channel formed by flange I88 and its rebent portion I89. The lower end (not shown) of the tubular shaped member I90 may have an outturned continuous flange and may be attached to the inner cover II in the manner shown in Fig. 2. The rubber tubular member I90 is stretched to position its flanges in the opposed channels of the covers so that under its contractional force the space between the covers is hermetically sealed from the interior and exterior of thecabinet. The upper end face of the tubular member I90 is substantially flush with the outer surface of the cover I86, in this instance, and seated thereon there is a rubber ring-like member I9I whose inner face aligns with the inner wall of the. tubular member. The rubber ring I9I has an upper convex surface therearound and on which a cover I92 seats. In the rubber ring thereis embedded a curled portion I93 of a reenforcing member which has a flat plate-like portion I94 which seats on the cover I86 and the upper end of the tubular member and extends therearound. The rubber ring I9I has an annular recess in its under face and which runs out at its outer edge, and this recess is provided to receive an annular border portion of an outer cover, or finishing plate I95. The finishing plate I95 seats on the flat portion I84 of the reenforcing member and is in spaced relation to .the cover I86.

In Fig. 14 there is shown a tubular sealing member I96 which is similar to the sealing member of Fig. 2, but differs therefrom in that its upper flanged end I91 has a wire ring I98 embedded therein for reenforcing the rubber. The wire ring I98 is preferably square in cross section and is located adjacent the seating face I89 of the flange of the tubular sealing member, as shown. In the construction shown in Fig. 15 there is a rubber sealing ring 288 which instead of having a reenforcing ring embedded in its flanged end 20I, has a wire-like ring 282 which is drawn tightly around the flange 28I, the ring 202 preferably being located adjacent the outer wall of a cover 203, as shown.

The operation of my refrigerating apparatus is as follows: The sublimation of the carbon di-. oxide in the bunker 50 maintains the temperature of the L-shaped support on which it rests, and the temperature of the header member III which is carried by the support, at a very low temperature and abstracts heat from the liquid in header Ill. The abstraction of heat from the liquid in header I0 results in the liquid therein being relatively colder than the liquid in the heat absorption part of the system, or ducts 88. The relatively colder liquid in header III will thus have a greater density than the warmer liquid'in ducts 88 and will cause circulation of the liquid through the circulatory system. The relatively cold liquid will flow from the header chamber I2 through the conduits 98 into the ducts 88 wherein it will absorb heat from the walls 25 and 21 and the finned plates I86 after which the liquid will flow through conduits 95 into the chamber 19 of the header I8 and give up its heat to the metal header I0. The rate of circulation of the liquid, and therefore the rate at which heat willbe removed from compartment I2 depends upon the height of the liquid level above the overflow edge'18. Since chamber I25 containing the relatively large body of expansiblecontractible liquid is disposed in chamber I2 and is insulated from the heat abstracting means, it will be understood that this large body of liquid is only subjected to the temperature of the air in compartment I2 and is therefore always at substantially the same temperature as the air in compartment I2. The body of liquid in chamber I25 expands and contracts in accordance with its heat content, and a slight change in its heat content will result in "a relatively large change in its volume. Upon an increase in the temperature of the air in compartment I2, and therefore in the liquid in chamber I25, the liquid will expand and some of the liquid will flow by gravity through conduit I30 into the chamber 12 of the header ID. This addition to the liquid in the circulatory system raises the level of the liquid in the header to a higher level above the overflow edge 18, with the result that the rate of circulation through the circulatory system is increased correspondingly. Thus it will be seen that the body of liquid in chamber I25 acts in accordance with the temperature of the food the leakage of heat into compartment I2.

storage compartment I2 to control the rate of circulation of the liquid through the circulatory system. As the temperature of compartment I2 is decreased the heat content of the relatively large body of liquid in chamber I25 will decrease with accompanying contraction of its volume. As the liquid in chamber I25 contracts, liquid flows from the header I0 to the chamber I25 which causes the amount of liquid flowing over the overflow edge I8 to decrease with accompanying decrease in the rate of circulation of liquid through the circulatory system. When the desired temperature has been reached in the compartment I2, some liquid will still flow over the overflow edge I8 to maintain the rate of circulation through the circulatory system just sufficient to overcome or balance the heat leakage into compartment I2. It will be seen that if relatively warm articles are placed in the compartment I2 that the liquid in chamber I25 will expand in accordance with the increase in heat in compartment I2 and will increase the rate of circulation of the liquid in the circulatory system to quickly lower the temperature of compartment I2. The temperature desired to be maintained in compartment I2 may be selected by adjustment of the member I1. Downward movement of the adjustment member 'I'I will increase the quantity of liquid above its overflow edge I8 which will require a greater reduction in the temperature of compartment I2 before the liquid in chamber I25 will have contracted sufficiently to reduce the rate of circulation through the circulatory system to the point where the rate of circulation is just sufiicient to balance Conversely, the higher the adjustment member IT is positioned, the higher the temperature that will be maintained in compartment I2 for the degree of expansion of the liquid in chamber I25 will have to be correspondingly higher in order to cause circulation of liquid through the circulatory system. The gas resulting from the sublimation of the solidified carbon dioxide escapes from the bunker 50 through the openings I58 in its corners at its upper end, permeates the insulation in the housing 24 and the insulation formingthe walls of the cabinet and escapes to atmosphere from under the loose fitting flange 8 of the outer cover 5 of the cabinet. The carbon dioxide gas, being dry, serves to keep the air dry and prevent corrosion of the metallic parts of the refrigerating apparatus.

What I claim and desire to secure by Letters Patent of the United States is:

1. Refrigerating apparatus comprising a liquid circulatory system having an elevated overflow portion, means for abstracting heat from one portion of said system, said system having another portion for absorbing heat from a region to be cooled, a liquid circulative in said system due to the difference between the temperatures of said portions and for conveying the absorbed heat to said heat abstracting means, the rate of circulation of said liquid being variable in accordance with its level above said overflow portion, and means providing a chamber for the liquid and connected in parallel with said circulatory system, said liquid being expansible and contractible in response to the temperature of said region to be cooled for varying the volume of the circulatory liquid to control the rate of circulation' thereof.

2. Refrigerating apparatus comprising a liquid circulatory system having an elevated overflow 7 2,177,852 portion, means for abstractingheat from one portion of said system, said system having another portion for absorbing heat from a region to be cooled, a liquid circulative in said system due to the difference between the temperatures of said portions and for conveying the absorbed heat to said heat abstracting means, the level of the liquid being above said overflow portion and raised relative thereto upon increase in the volume of the liquid with the rate of circulation of the liquid being correspondingly increased, means providing a chamber in communication with said liquid circulatory system and in heat transfer relation with said region to be cooled, means connecting said chamber adjacent its top and bottom to said circulatory system, and a quantity of liquid in said chamber expansible and contractible in response to the temperature of said region to be cooled to vary the volume of the liquid in said circulatory system.

3. Refrigerating apparatus comprising a liquid circulatory system having an elevated portion over which the liquid flows, means for abstracting heat from one portion of said system, said system having another portion for absorbing heat from a region to be cooled, a liquid circulative in said system due to the difference in temperatures between said portions and for conveying the absorbed heat to the heat abstracting means, the rate of circulation of said liquid being increased upon increase in its level above said elevated portion, means providing a chamber communicating with said system and in heat transfer relation with said region to be cooled, and a quantity of liquid in said chamber, the level of said circulating liquid being raised or lowered by the expansion or contraction of said liquid in said chamber resulting from the changes in temperature of said region to be cooled, thereby controlling the rate of flow of said circulating liquid in accordance with said temperature of the region to be cooled.

4. Refrigeratingapparatus comprising a liquid circulatory system, means for abstracting heat from said system at one portion thereof, said her being connected in-parallel to said circulatory system, said relatively large body of liquid being expansible and contractible in response to slight changes in its heat content for correspondingly varying the quantity of liquid in said circulatory system to control the. rate of circulation of the liquid.

5. Refrigerating apparatus comprising a closed liquid containingsystem having an elevated overflow means, means to abstract heat from said system at one portion thereof, said system hav-- ing another portion for absorbing heat from a region to be cooled and having a third portion in heat transfer relation with the region to be cooled, a quantity of liquid in said system with a variable quantity of said liquid being circulative through a portion of said system due to the difference in temperatures between said firstnamed and said second-named portions and with the remaining portion of said quantity of region to be cooled to vary the quantity of liquid in the circulatory portion of the system to control the rate of circulation of the liquid.

6. Refrigerating apparatus comprising a liquid circulatory system, a heat abstracting means for abstracting heat from one portion of said system, said system having another portion for absorbing heat from a region to be cooled, a quantity of expansible-contractible liquid circulative in said system due to diflerence in temperatures between said portions for conveying the absorbed heat to said heat abstracting means, said system including a substantially vertically extending header member having an overflow edge effective upon predetermined contraction of said liquid to interrupt flow thereof, said header memher having wall means extending substantially longitudinally therein providing extended surfaces in heat transfer relation to the liquid passing through said header member.

'7. Refrigerating apparatus comprising a liquid circulatory system including a substantially vertically extending header member having an overflow edge, a solidified refrigerant medium for abstracting heat from said system at said header member, said system havinganother portion for absorbing heat from a region to be cooled, a

metallic heat conductive supporting member for" said refrigerant medium and in heat conductive engagement with said header member, a liquid circulative in said system due to difference in temperatures between said header member and said heat absorbing portion for conveying the absorbed heat to said refrigerant medium, said liquid being expansible and contractible in accordance with its heat content with the rate of flow over" said overflow edge varying in accordance with the expansion and contraction of said liquid. A

8. Refrigerating apparatus comprising a cabinet having acompartment to be refrigerated, a

heat transfer system including a metallic wall means disposed in said compartment for absorbing heat therefrom-said wall means having duct means for the passage of a heat transfer liquid, duct means connected to said first-named duct means and cooperating therewith to provide a circulatory system for said liquid, a solidified refrigerant medium forabstracting heat from a portion of said last-named duct means, a liquid circulative through said circulatory system for conveying the heat absorbed by said wall means to said refrigerant medium, a plurality of heat conducting fins associated with said wall means, said fins being disposed'adjacent the top of said compartment and having portions overlying said first-named duct'means in good heat transfer relation with the liquid therein, and means for controlling the rate of circulation of said liquid to control the temperature of said compartment.

. 9. In a refrigerating system having a cabinet containing an insulated compartment to be refrigerated, a refrigerating apparatus disposed in said compartment comprising a container having a substantially vertically disposed heat absorbing wall means in said compartment, said wall means having duct means for the passage of a heat transferring liquid, a second container of heat conductive material and disposed within said first-named container for containing a solidified refrigerant medium, the walls of said second-named container being spaced from the walls of said first-named container, heat insulating material between the walls of said containers, a header member disposed within said first-named container and in heat conductive relation with said second-named container, conduit means connecting said duct means and said header member, said duct means, said header member and said conduit means cooperating to provide a liquid circulatory system, a liquid circulative through said system due to difference in temperatures between said wall means and said header member and for conveying the absorbed heat'to said refrigerant medium, and means forcontrolling the rate of circulation of said liquid.

10. In a refrigerating system having a cabinet containing an insulated compartment to be refrigerated, a refrigerating apparatus disposed in said compartment comprising a container having a heat absorbing wall with duct means for containing a heat transferring liquid, a second container disposed within said first-named container for containing a solidified refrigerant medium, heat insulating material between the walls of said containers, a header member disposed in said first-named container in heat conductive relation with the refrigerant medium in said second- ,named container, a conduit means disposed with- 1 in said first-named container with one end connected to said duct means and the other end connected to said header member adjacent its upper end, said conduit means being inclined and extending downwardly from said duct means to said header member to induce flow toward said header member, a second conduit means having one end connected to said duct means and the other end connected to said header member adjacent its lower end, said header member, conduit means and duct means cooperating to provide a liquid circulatory system, said header member having an overflow edge disposed above the point of connection of said first-named conduit means, an expansible-contractible liquid circulative in said system due to the difference in temperatures between said duct containing wall means and said header member for conveying the absorbed heat to said refrigerant medium, the rate of circulation of said liquid depending upon the height of fire liquid level above said overflow edge, means providing a chamber for containing a quantity of expansible-contractible liquid and disposed in heat transfer relation with saidv compartment, said chamber being connected to said header member and at a point below the liquid level therein, the liquid in said chamber being expansible and contractible in accordance with the temperature of said compartment for correspondingly raising and lowering the level of the liquid in said header member to control the rate of circulation of the liquid.

11. Ina refrigerating apparatus, a cabinet having a compartment to be refrigerated and hav. ing a top wall formed by spaced inner and outer heat insulated walls, said walls having aligned openings with the opening in said inner wall being relatively larger than the opening in said outer wall, a container in said compartment having a heat absorbing surface, said container havng an open upper end registering with the opening in said inner wall and being in communication with the space between said walls, said container having a seating surface for said inner wall, compressible sealing means disposed between said seating surface and said inner wall, clamping means for clamping said inner wall to said seating surface to compress said sealing means for sealing the interior of said container from said compartment, 9. second container within said first-named container for containing a solidified sublimating refrigerant medium for abstracting heat from said compartment, the walls of said second-named container being spaced from the walls of said first-named container, said second-named container having an open upper end registering with the opening in said outer wall, a sleeve member positioned between said inner and outer walls and concentric with said openings, said sleeve member having one end sealed to the periphery of said second-named container and the other end sealed to said outer wall to seal the space between said inner and outer walls and the space between the walls of said containers from the exterior of said cabinet, removable closure means for closing the opening in said outer wall, said second-named container having an aperture providing communication between the interior of said second-named container and the interior of said first-named container for the passage of the gaseous refrigerant into the space between said inner and outer walls,

porous heat insulating material between said inner and outer walls and between the walls of said containers, and heat transfer means for transferring heat from said heat absorbing surface to said solidified refrigerant medium.

12. In a refrigerating apparatus, a cabinet having a compartment to be refrigerated defined by a container having an open upper end and a removable wall seating on the upper end of said container and forming the top wall of said compartment, compressible sealing means disposed between the upper end of saidcontainer and said removable top wall, clamping means for clamping said removable top wall to said container to compress said sealing means and hermetically seal said container from the exterior thereof, an outer container enclosing said firstnamed container and having an open upper end, a removable cover member closing the upper end of said second-named container and spaced from the top wall of said compartment, heat insulating material between the walls of said containers, said top walls having aligned openings with the opening in the top wall of said compartment being relatively larger than the opening in the top wall of said outer container, a third container and disposed within said second-named container, said third container having an open upper end registering with the relatively larger opening in the top wall of said compartment and communicating with the space between said cover member, and the top wall of said compartment, said third container having an annular supporting surface on which the top wall of said compartment seats, compressible sealing material between said annular seating surface and the top wall of said compartment, clamping means for clamping the top wall of said compartment against the seating surface of said third-named container for compressing said sealing means and hermetically sealing the interior of said third-named container from the interior of said second-named container, a fourth container disposed within said third-named container for containing a solidified sublimating refrigerant medium -for abstracting heat from said compartment, said fourth-named container having an open upper end registering with the opening in said cover member, a sleeve member having one end sealed to the periphery of said fourth-named container and the other end sealed to said cover member, said fourth-named container having an said gaseous refrigerant from said cabinet.

13. In a refrigerating apparatus, a cabinet having a compartment to be cooled, a cooling apparatus disposed in said compartment and including a liquid circulatory system, and a container disposed in said compartment providing an expansion chamber for a body of expansiblecontractible liquid operable to control circulation L of the liquid in said circulatory system, said container forming a partition in said compartment and being spaced from the walls of said compartment to provide for circulation of air.

14. In a refrigerating apparatus, a cabinet having a compartment to be cooled, a cooling apparatus disposed in said compartment including a metallic housing having heat absorbing walls and containing a liquid circulatory system for conveying the heat absorbed to a heat abstracting means, a partition in saidcompartment and containing an expansion chamber for a body of expansible-contractible liquid operable in response to the temperature of said compartment to control circulation of the liquid in said circulatory system, said partition and said housing cooperating to divide said compartment into two compartments with said partition being spaced from the walls of said cabinet to provide for the circulation of air between-said two compartments.

15. In a refrigerating apparatus, a cabinet, a cooling apparatus disposed in said cabinet and removable therefrom as a unitary structure, said cooling apparatus including a metallic housing having heat absorbing walls and containing a liquid circulatory system for conveying the absorbed heat to 'a heat abstracting means contained in said housing, spaced partitions extending from a wall of said housing and cooperating with walls thereof to divide the interior of said cabinet into three compartments for the storage of articles to be refrigerated, one of said partitions having an expansion chamber for containing a body of expansible-contractible liquid operable in response to the temperature of the air in said cabinet to control circulation of the liquid in said circulatory system, said partitions having provisionsfor the circulation of air between said three compartments.

16. In a refrigerating apparatus having a cabinet and a cooling apparatus therein having a vertical heat absorbing wall with a hollow portion for circulation of a heat abstracting means therethrough, a plate member of high heat conducting material fixed to said heat'absorbing wall, said plate member having a longitudinal portion having flanges formed out of said plate member and extending above said hollow portion and outwardly from said wall and intothe path of circulating air in said cabinet, said plate member having a flat lower end portion having substantially its entire area of one side in contact with said wall.

17. In a refrigerating apparatus having a cabinet and a cooling apparatus therein having a heat absorbing wall, a plurality of plate members of high heat conducting material fixed to said heat absorbing wall adjacent the upper end of said cabinet, each of said plate members having a fiat lower end portion having substantially its entire area of one side in contact with said wall, each of said plate members having a channel formed upper end portion with the sides of the channel formed portions being formed out of the plate members and extending vertically and also extending outwardly from said wall to absorb heat from air circulating in said cabinet.

18. In a cooling apparatus having a liquid circulatory system for conveying heat absorbed from a region to be cooled to a heat abstracting means, means disposed in and responsive to the temperature of the air in said region for controlling circulation in said system, said means comprising a container having an expansion chamber for a body of expansible-contractible liquid operable to control circulation in saidsystem, said container being formed by two sheets of metal fixed together and having oppositely extending indented portions cooperating to .form the expansion chamber, and means connecting said chamber at the top and bottom thereof to said circulatory system.

19. In a cooling apparatus, a housing having heat absorbing walls, a container disposed in said housing for containing a heat abstracting means for abstracting the heat absorbed by the walls of said housing, the walls of said container beingin spaced relation to the walls of said housing, means supporting said container with its bottom wall in spaced relation to the bottom wall of said housing, said supporting means being formed of a material having a high resistance to the conduction of heat, and tie rods for rigidly holding said container, said tie rods each having oneend connected to said container'and the other end connected to said housing, said tie rods being obliquely positioned relative to the walls of said housingvand said container whereby a component of the force exerted by each rod acts to hold said container down against its seat while other components of the force exerted by said rods oppose each other to prevent lateral movement of the container in any direction.

20. In a refrigerating apparatus, a cabinet having an inner metallic liner defining a compartment to be refrigerated, a cooling apparatus disposed in said compartment and seated on the bottom wall of said liner, said. cooling apparatus including a metallic housing having heat 1 to a wall of said compartment, means for securing said substantially vertically extending wall to the last-named wall of said compartment, and

spacer members disposed between said last-named walls and formed of material having a high rea sistance to conduction of heat.

21. In a liquid circulatory system, a header inlet chamber, said extension member being vertically adjustable with its upper end constituting an overflow edge, said header member including a casing portion at its upper end with said casing portion having an aperture through which 5 liquid is introduced into the header member and through which said tubular extension is accessible for adjustment.

DANIEL D. WILE.

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