US2027192A

US2027192A - Refrigerating system

Info

Publication number: US2027192A
Application number: US557476A
Authority: US
Inventors: Muffly Glenn
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-08-17
Filing date: 1931-08-17
Publication date: 1936-01-07
Anticipated expiration: 1953-01-07

Description

G. MUFFLY REFRIGERATING SYSTEM Jan. 7, 1936.

4 Sheets-Sheet l Filed Aug. 17, 1931 INVENTOR BY #iM/1. Mmaw Jan. 7, 1936.

G. MUFFLY REFRIGERATING SYSTEM Filed Aug. 1'7, 1951 INVENTOR 4 Sheets-Sheet 2 ooooooco GZenw Maf/ly.

Jan. 7, 1936. G. MUFFLY REFRI GERATING SYSTEM Filed Aug. 17, 1931 4 Sheets-Sheet 4 mimmml,

Patented Jan. 7, 1936 PATENT OFFICE BEFBIGEBATING SYSTEM Glenn Mully, Scarsdale, N. Y. Application 'August 17, 1931, serial No. 557,476

17 Claims.

,The invention relates to refrigerating systems, and it has particular relation to a refrigerator of the mechanically operated type.

The invention in some respects constitutes an improvement over my co-pending application for patent on a refrigerator, Serial No. 455,741, filed May 26, 1930, and in some respects is related to my Patent 1,787,209 issued December 30, 1930.

The principal objects of the invention are to provide a refrigerator cabinetin which a refrig erating system is so mounted that it may be easily handled and manipulated by a single worklman without special equipment, and the system readily installed, removed, and transported; to

provide a refrigerator of this character in which the refrigerating system is movably connected to a wall of the cabinet other than the front wall thereof, whereby the system can be moved downwardly into the refrigerated space and the heat dissipating part of the system disposed in such position that it is accessible through the door of the refrigerator; to provide a refrigerator in which the heat' dissipating part of the refrigerating system is cooled in a novel and ecient manner; to provide a refrigerator in which a refrigerating system is provided with a thermal element which is adjustable with respect to the heat absorbing part of the system; to provide a refrigerating system in whichA clock control means are utilized for starting and stopping the system and maintaining it out of operation for a predetermined period of time; to provide a refrigerating system of the last mentioned character having control means for temporarily rendering the clock control inoperative if this is desired; to provide a refrigerator cabinet having a. refrigerating system therein which can bodily be removed from vthe cabinet through the door thereof, or bodily moved into the refrigerated space of the cabinet where various parts of the system will be accessible for adjustment and the like; and to provide a refrigerator having a drip pan and receptacle therefor which are constructed and arranged in the refrigerator cabinet in a novel manner.

For a better understanding of the invention, reference may be had to the accompanying drawings forming a part of the specification, in which:

Figure 1 is a fragmentary elevational view of a refrigerator constructed according to one form of the invention, with parts broken away for the purpose of illustrating the interior of the refrigerator;

Fig. 2 is a cross sectional View on a larger scale, taken substantially along line 2 2 of Fig. l;

Fig. 3 is a cross sectional View on a larger scale taken substantially along v the line 3 8 of Fig. 2;

Fig. 4 is a cross sectional View taken substantially along line 1 4 of Fig. 3;

Fig. 5 is a cross sectional view on a larger scale. 5 taken substantially along line 5 5 of Fig. 1;

Fig. 6 is a cross sectional viewon a larger scale taken substantially along line 6 6 of Fig. 5;

Fig. 7 is a cross sectional view taken substantially along line 'I I of Fig. 6; 10 Fig. 8 is a side view partly in cross section taken substantially along line 8 8 of Fig. 6;

Fig. 9 is a. cross sectional view on a larger scale, taken substantially along line 9 9 of Fig. l;

Fig. 10 is a diagrammatic illustration of an elec- 1.5 trical circuit utilized in the refrigerating system;

Fig. 11 is a fragmentary view taken interiorly of the refrigerator cabinet, illustrating a modified form of drip pan and receptacle therefor;

Fig. 12 is a1 fragmentary view of a modified form of clock controlling mechanism that may be employed in the system; a r.

Fig. 13 is a cross sectional view on a larger scale taken substantially on the line I3 I3 of Fig. 12; 25

Fig. 14 is a diagrammatic view with certain parts in cross section, illustrating the connection between the condenser and evaporator.

Referring to Fig. 1, a refrigerator cabinet is indicated generally at I0 which comprises a body 30 II, a covering element I2 for the top of the cabinet, and a pivoted door I3 at the front of the cabinet. Interiorly of the cabinet, conventional shelves I I are supported in a refrigerated space I5 provided in the lower region of the 35 cabinet.

Referring now to Fig. 5 particularly, that portion of the cabinet defining the refrigerated space I5 is provided with walls I 6 composed of insulating material, the'upper edges of which are 40 surrounded with a frame work indicated at I'l.

The inner and outer surfaces of the insulating material I6 and the frame I1 are lined in a conventional manner with suitable covering material indicated generally at I8. The frame I'l 45 is inclined at its upper and inner edge as indicated at I9 for the purpose of providing a support for a base 20'upon which the refrigerating system is mounted. A sealing element 2| preferably is disposed between the frame I1 and the 50 base 20 to seal the interior of the refrigerator or the refrigerating space. The outer peripheral portion of the base 20 has a frame 22, while the intermediate portion thereof is composed of insulating material indicated at 23, although it 55 should be understood that any suitable material may be used for the base. A U-shape bracket 24 secured to the lower' surface of the base 20 and at its rear edge, as indicated at 25, extends downwardly into the refrigerated space adjacent the rear wall of the cabinet and includes a laterally directed portion 26 which is pivotally seated in hinge elements 21 secured as indicated at 28 to the rear wall of the cabinet.

The front edge 22 of the base 2|] is inclined slightly to the vertical as indicated at 29 in a manner substantially complemental to an inclined rear edge surface 30 formed on a transversely extending member 3| forming a part of the cabinet and which is disposed at the upper edge of the door 3. 'Ihe front edge portion of the base 2|!v is adapted to be supported by a latch bolt 32 slidably disposed in a channel member 33 secured in the lower portion of the frame 22 at the front edge of the base 20. 'Ihis bolt is normally urged toward the member 3| by a spring 34 encircling the rear part of the bolt and engagingthe rear wall of the channel 33 at one end, and a fianged portion 35 on an intermediate part of the bolt at the other end. The front end of the bolt, when the base 20 is in position as shown by Fig. 5, projects into a keeper 36 attached to the member 3|. At one point the lower wall of the channel 33 is apertured as indicated at 31, which permits the insertion of a screw driver into the channel 33 in front of the anged portion 35 on the bolt, for the purpose vof moving the fianged portion and bolt rearwardly until the bolt is free of engagement with a keeper 36. For the purpose of positively preventing downward movement of the base 20 about the hinged connections 26 and 21, should the bolt 32 become broken, for example, a screw 39 projects through an opening in the channel 33, upwardly through the frame 22 at the front edge of the base 20, and is threaded into a plate 40 secured as indicated at 4| to the upper surface of the member 3| forming a stationary part of the cabinet. The screw in its operative position, is disposed immediately to the rear of the anged portion 35 of bolt 32, and hence positively prevents accidental movement of the bolt rearwardly and disengagement thereof with the keeper 36.` A resilient element 42 is disposed between the plate 40 and the upper surface of the member 3| for sealing the space above the base 29 against air circulation to or from the space below it.

The weight of the front portion of base 20 and parts mounted thereon will be supported by the screw 39 or by the bolt 32 or by both according to how tightly screw 39 is screwed home.

A heat absorbing unit or evaporator 45, is suspended from the lower surface of the base 26 and comprises the usual convolution of coils 46. The outlet end of the evaporator coil indicated at 46' extends through the base 20 and is connected to the intake side of a compressor located above the base, while the inlet end of the evaporator is connected to an expansion device which is in turn connected through the base to a condenser also mounted at the upper side of the base. 'I'he condenser, compressor, and associated apparatus above the base 20 presently will be described. The evaporator coil 46 serves as a support for ice trays 41, and is supported on a plate 48 having vertical side portion 49', secured at their upper edges to the lower surface of the base 2|). The open front end of the evaporator unit is substantially closed by a vertical plate 49 having a flange ice trays.

aos?, rea j 50 at its upper edge secured to the lower surface of the base 20 by means of the previously mentioned screw 39. The flange 50' normally covers or seals the openings 31 in the lower wall of the channel 33. y

The wall 49 is provided with suitable openings 50 by means of which the ice trays 41 may be removed and inserted into the evaporator unit. A cover 5| pivoted as indicated at 52 to the plate 49 immediately above the opening 50, normally 10 closes the latter although it can be readily moved about its pivot when it is desired to remove the 'Ihe lower edge of the plate 49 is integrally connected to a drip and baille pan 53 that tapers rearwardly to a point in proximity to a l5 rear corner of the refrigerator cabinet. At this point a drip cup 54, which is adapted to receive moisture dripping from the evaporator, is supported on the shelf I4. The rear end of the drip pan 53 terminates in a substantially vertically 2O projecting portion 55 which is provided with openings 56 adjacent its upper edge adapted to be releasably engaged with projecting end portions 51 of the hinge elements 21. It is apparent that the baille is secured at its front and rear ends to sta- 25 tionary parts of the cabinet, by means of the screw 39 threaded into the plate 40, and the hinge elements 21 connected to the rear wall of the cabinet. Hence the baiile would catch any falling part of the refrigerating system and prevent pos- 30 sible injury to the cabinet lining, to dishes contained in the cabinet or to a person removing or placing food in the refrigerated space below the baille.

At its upper side, the base 26 supports a motor 35 60 and a compressor 6| which are secured to the! base by means of bolts 62. A discharge4 pipe 63 extending from the compressor 6| is connected to an upper coil of a condenser 64 located at the rear edge of the base 20 and supported thereby. o As best shown by Figs. 5 and 9, the condenser comprises end plates 65 and 66 which respectively have slots 61 at their front and rear edges, adapted to support front and rear, upwardly converging rows of condenser tubes. In one method of 5 construction each opening initially has a front straight portion 68 through which a tube of the condensing unit is adapted to pass, which opening terminates in a circular portion adapted to receive the tube and retain it in position. After 50 the tube is so positioned, a lip 69 which initially has been turned into a horizontal position, is reverted to a vertical position and in the latter position prevents movement of the tube outwardly through the slot. The condenser tubing is pref- 55 erably supplied with ns 10. f

A trough shaped element 1| attached to the parts 65 and 66 makes the assembly more rigid and directs air flow over the tubes. 'I'he condenser is so positioned on the rear of the base 60 20 that the rear row of tubes is disposed rearwardly of the plane of the rear surface I8 of the refrigerator cabinet. Vertically extending

corner posts

15 and 16 at the rear of the refrigerator cabinet adjacent to its sides are provided as part 65 'of the frame structure and to maintain the cabinet spaced from any room wall to which the rear of the cabinet is disposed in adjacent relation. This space between the rear wall of the cabinet and the Awall of the room adjacent there- 70 to, permits cool air from the lower part of the room to flow upwardly between the rear wall of the cabinet and the room wall toreplace air that has been heated by the condenser and thus caused to ow upward. The trough 1| project- '15 monarca V 3 ing as it does downwardly between the convolu tions of the condenser, constitutes a guide for deilecting the flow of cool air around the tubes of the condenser. For facilitating this manner 5 of cooling the condenser, the cover portion I2 at the top of the refrigerator cabinet, is provided with a flue 18, at the rear cdge thereof, which is located mainly above the condenser. Air surrounding the motor 60 andthe compressor 6| is also caused to circulate due to its thermal expan'- sion, the heated air passing rearward and upward through the flue 18 and cool air coming in at the front of the cabinet through the louvers The condenser 64 is connected tothe evaporator 46 by means of a capillary tube 69' extending through the rear of the base 20 as shown particularly by Figs. 2, 9 and 14. The condenser end of the tube 69 is provided with an elongated,

20 fine mesh screen 10' which has its outer end retained in an opening 1| formed in the flare union part 12' which coacts with the flare union tion 14' and then projects through a flare unionv 15' which coacts with the flare nut 16' on the end of the evaporator coil 46.

It should be understood that the refrigerating system includes the motor 60, compressor 6|, condenser 64 and evaporating unit 45 and that the ilrst three mentioned parts of the system are mounted on the upper side of the base 20 while the evaporator is suspended from the lower side of the base 20. Hence the system 40 moves with the base 20, either when the latter is pivoted about the hinge connections 26 and 21 or is bodily removed from the refrigerator. `When it is desired to inspect the system or make repairs thereon, the screw 39 is removed, and '45 then the drip pan is disengaged from the hinge connections 21 and removed from the cabinet. Also the shelf I4 and drip cup 54 are removed from the cabinet. Then the latch bolt 32 is moved rearwardly by a screw driver or other suitable tool, until it is disengaged from the keeper f 36 and then the base 20 with the system mounted thereon is Aallowed to move downwardly about the hinge pivot 26 into the refrigerated space until the evaporator rests against the rear wall of vt-he cabinet. This movement positions the motor, compressor and condenser at the door opening where ready access may be had to such parts of the system. A single workman can bodily remove the base and system through the door way, by means of handles 80 and 8| provided on the upper side of the base and when the base and system have been moved downwardly into the refrigerated spaces, the handles serve as a means for manually lifting the base and disengaging hinge element 26 from hinge elements 21,

whereupon the base and system can be withdrawn through the doorway. Re-positioning the base and system in the cabinet is effected in a reverse manner. The electrical meansl for controlling the operation of the system now will be described. Re-

ferring to Figure 9, this electrical means includes a clock mounted in the front wall of the refrigerator cabinet above the door I3, and a ther- 75 mally responsive switch mounted in a box 86 secured to the upper side of the base 20 adjacent the motor 60. As best shown by Figures 3 and 4 the thermally responsive switch includes anv expensive bellows 81, and a capillary tube 89 which extends from one end of the bellows toward the 5 rear of the refrigerator cabinet along the base 20 at its upper side, (Fig. 2) and then downwardly between the frame 22 and the cabinet. Then the tube extends along the inner side of one of the walls 49' at the side of the evaporator unit tol0 ward the door I3, then is looped about a pin 9| secured in said wall 49', and then extends along an arm 92 mounted on the pin 9|, to a point near the door I3. At its forward end, the tube 89 terminates in a bulb 93 secured to the forward l5 end of the arm. This bulb is partially filled with a volatile liquid of a character conventionally used in thermal switches, and is adapted to be disposed in variable positions with respect to the evaporator coils 46, from which it follows that the vapor 20 pressure of the fluid in the bulb will be affected by the position of the bulb with respect to the evaporator coils. The forward end of the arm 92 has an offset portion 94 which, as best shown by Fig. 1, extends laterally beyond the end of the pivoted 25 cover 5I and the plate 49, and then terminates in a handle 95 accessible upon opening' the door of the refrigerator, for moving the arm 92 and consequently the bulb 93 vertically with respect to the evaporator coils. Spaced depressions 96 30 formed in the front edge portion of the plate 49' are adapted selectively to cooperate with a projection 91 on the arm 92 for securing the arm in any of its adjusted positions.l

Referring again to Figs. 3 and 4, the inner end. .5 of the bellows s1 is provided with a plate no hav;j ing a central projection IOI which retains one end of a spring |02 that at its other end abuts a collar I 03 adjustably maintained in position by a screw |04 threaded through the adjacent wall 40 of the switch box. Also the plate |00 is provided with a projection |05 pivoted upon a pin |06 secured at its ends to inwardly projecting lips |01 of the switch box. Hence upon expansion or con- 4- traction of the bellows, the plate |00 pivots about 'J the pin |06. The screw |04 serves as a means for adjusting the tension of the spring |02 and consequently permits a variable resistance to expansion of the bellows 81 and hence a variation in the thermal control. The upper edge of the plate |00 also is provided with a bifurcated, non-conducting projection I|0 which has a pin III projecting through an elongate slot I|2 formed in a switch operating arm II3 disposed between the legs of the projection. The outer end of arm |I3 is of cylindrical shape as indicated at II4 and a spring I I5 encircling this portion of the arm, abuts at its lower end a collar |I6 slidably movable on the arm. The outer surface of the bifurcated arm 00 I I0 is substantially cylindrical in shape and when the arm is moved, it is capable of moving the collar |I6 against the spring. The outer end of the spring abuts a second collar II8 which is rigidly mounted on the arm, and the outer end of 6" the arm is provided with a roller ||9. When the bellows contracts from its expanded position as shown in Fig. 4 the arm ||0 is moved toward the right and when the pin II I has moved to a certain position the spring I I5 acts to move the roller II!) and arm |I3 counterclockwise into the position shown in broken lines |20. Conversely when the bellows expands the pin III is noved to the left, and at a certain point in such movement, the 7 spring acts to move the roller ||9 back into its full line position as shown by Fig. 4.

When the roller ||9 is in its full line position, it engages a pair of electrical contact elements |2| and |22, as best shown by Fig. 3, which are secured to an insulating element |24 projecting downwardly through the upper wall oi' the switch box 86, one wall |25 of the insulating element serving as a stop when the roller IIS moves into its broken line position as shown by Fig. 4. Electrical conductors |26 and |21 projecting above the upper surface' of the insulating element |24 are respectively secured to the contact element |2| and a conductor |30 extending through a wall of the switch box. The element |22 in turn is connected to a second conductor |3| which also extends through the switch box wall and when the plates |2| and |22 are bridged by the roller H9, the conductor |26 is electrically connected to the conductor 3| and an electrical circuit through lthe switch box can be completed. Conductors |30 and |3| extend to the motor 60 which preferably has starting and running windings, the former of which is automatically rendered inoperative when the speed of the motor has reached a predetermined number of revolutions per minute.

As best shown by Fig. 9, an electric cable extends through the rear of the refrigerator cabinet adjacent an edge of the base 20, and comprises conductors |36 and |31, which lead directly to the clock 85. A flexible branch conductor |38 connected to conductor |31 extends laterally toward the switch box 86 and as best shown by Fig. 5 is connected to aconventional type of plug |39 having two terminals adapted to engage the terminals |26 and |21 on the switch box shown by Fig. 3. Another flexible conductor |40 extending from the plug |39 extends to the clock 85. as shown by Fig. 9.

Referring now to Figs. 6, 7 and 8, the clock 85 is provided with a synchronous motor |42 directly connected to the conductors |36 and |31 and it therefore operates continuously. Conductor |36 also is connected to binding post |44 mounted on an insulator |43 which is supported by the clock frame |42', and from this connection. a wire resistance |45 extends upwardly and is connected at its upper end, as indicated at |46, to a second similar binding post |46 on an insulator |41. A conductor |48 extending from connection |46 is connected to a commutator brush |50 by means of a bolt |49 securing the brush on an insulating block |5I. The latter is pivotally mounted on a pin |52 projecting from frame |42 of the clock. A second commutator brush |53 shown in Figs. 10 and 13, is secured to the insulating block |5| by a bolt |53', which also connects this brush to electrical conductor |40 extending from the female connector |39. The commutator brushes are mounted on the insulating element |5| in1 insulated relation and their free ends are adapted to have wiping engagement with a metal commutator sleeve |54 secured on an insulating element |55, which engagement is assured by virtue of the fact that the brushes are made of spring stock. The element |55 is mounted on a shaft |55' which is operatively connected to and driven by the synchronous motor |42. The metal sleeve |54 extends about a major portion of the periphery of insulating element |55 and is adapted to bridge the ends of the commutator brushes and |53 and complete the circuit between electrical conductors |36 and |40. Between the ends of the metal sleeve |54 insulating element |55 has a V shaped .ing the bi-metallic element |64 in the manner energica It will be noted that the' metal sleeve |54 has an 1o inwardly directed radial end portion |58 and consequently when the commutator has so moved that the tooth moves pastl the commutator` brushes, they will snap into engagement with such radial portion of the metal sleeve by their'l5 own spring action and be electrically connected; f An arm |60, also pivotally mounted on-the pin |52 is connected by a pin 6| to the insulating element |5| and accordingly when either of these elements is moved about the pivot |52, both ele- 2O Y,

ments will be moved together. -A part of arm |60 has a catch |62 which is adapted to engage under a struck out lip |63 formed on a bimetalllc element |64 extending between insulators |43 and |41 and retained by notches in said insulators. 25 The bi-metallic element is of such character, that when the resistance 45 becomes excessively heated the intermediate portion of the bi-metallic element will be movedv toward the resistance which will cause the struck out lip |63 to disen- 80 gage from the catch |62. When such disengagement occurs a spring |65 connected at one end as indicated at |66 to a stationary part of the clock, and at its other end to the arm |60, will cause the arm and insulating element |5| to turn 3.5 about the pivot |52, in a counterclockwise direction, which will result in a movement of the commutator brushes |50 and |53 away from the com mutator |54. For the purpose of manually mov- 40 just described, an arm |68 is pivotally mounted on the clock frame |42 as indicated at |69, and it is provided with a lip portion |10 disposed adjacent the bi-metallic element, which, upon turning the arm in a clockwise direction, moves the bi-metallic element in. the manner previously mentioned. The opposite end of the arm |68 indicated at |12 is disposed adjacent to a frustoconical element |13, rigidly secured on a plunger |14, projecting towards the front wall of the clock casing and which terminates in a button |15 projecting through such Wall. Inwardly of the front wall of the clock casing the button |15 is provided with a shoulder |16 adapted to prevent a complete movement of the button outwardly through the wall, and which also serves as an abutment for one end of a helical spring |11 encircling the plunger interiorly of the' clock casing. The opposite end of the spring lengages a bracket |18, stationarily mounted inthe clock casing and which serves as a means for limiting Ymovement of the frusto-conical element |13.

Assuming 'that the metal commutator sleeve |54 electrically connects commutator brushes |50 and |53, and that the bellows is expanded and therefore the roller ||9 electrically connects the terminals |2| and |22 in switch box 86, an electrical circuit is completed through the motor 60 and the refrigerating system will operate to reduce the temperature in the refrigerator. When this temperature has been reduced to a predetermined point, the vapor pressure in the bellows, will be suiliciently reduced to allow the bellows to collapse, which will cause the roller ||9 to move into its inoperative position thereby opening the motor circuit. When the temperature of the refrigerator is raised suil'iciently, it is apparent that the bellows 81 will again expand and complete the circuit through the motor, whereupon the refrigerating system again will operate to reduce the temperature in the refrigerator. If for any reason the motor becomes overloaded, the excessive current passing through the resistance |45 will suilciently heat this element that the bi-metallic element |64 will bend toward the resistance and disengage the lip from the catch |62 whereupon the spring |64 will move the insulating element |I, and the commutator brushes will be moved out of engagement with the commutator, whereupon the circuit through the motor will again be interrupted. Assuming however that no excessive loading of the electrical circuit occurs, manual interruption of the circuit may be effected by pushing button |15, which will cause the arm |68 to turn about pivot |69 and in turn the lip on the arm to move the bi-metallic element toward the resistance |45 and the lip |63 out of engagement with the catch |62 and then the spring |65 will act to move the commutator brushes way from the commutator and deenergize the motor.

Assuming that the commutator brushes are in contact with the metal sleeve |54, disengagement of the brushes with the metal sleeve will automatically occur at a predetermined time by rotary movement of the commutator by the clock Then the commutator brushes will engage the tooth |51 on the insulating element |55 of the commutator and be maintained out of engagement with the metal sleeve |54 until the clock motor has rotated the commutator into such position that the tooth moves past the ends of the commutator brushes when the latter, due

to their own spring action, will engage the radial end |58 of the metal sleeve on the commutator. Hence dring a predetermined interval of time, preferably at a time when most electrical energy is being used by a community, the clock will so function that the commutator brushes are engaging the insulating element on the commutator and the motor inthe refrigerator will be prevented from operating for a predetermined period of time regardless of temperature conditions within the cabinet.

From the above description, taken in connection with Fig. 10 illustrating the electrical circuit, it should be understood that the thermally responsive switch located in switch box 86 serves as ameans for automatically energizing and de-energizing the motor depending on the temperature in the refrigerator. It is also apparent that independently of the thermal control, the clock will interrupt the electrical circuit through the motor if it is completed through the thermally responsive switch, at a predetermined time and for a predetermined interval of time. Also it will be understood that regardless of the operation of the clock, the motor circuit may be opened by manual operation of push button' |15 which separates the commutator brushes from the commutator. Also, it will be understood that if the electrical circuit is so interrupted by pushing button |15, that it may be again completed insofar as the clock is concerned, by pushing button |80 which will cause the commutator brushes again to be brought into contactwith the commutator and retained in their positions by the catch |62 engaging the lip |63 on the bi-metallic element. Thus if it is desired to prevent operation of the refrigerating system at times when the thermally responsive switch is acting to complete the electrical circuit through the motor, it is only necessary to push button and the system may be de-energized for any period of time required -whereafter it again may be completed or energized by pushing button |80.

For the purpose of preventing interruption of the system by operation of the clock, when ior example it is desired to secure or maintain a low freezing temperature in the refrigerator during the time the clock normally would prevent energization of the motor, a modified arrangement shown in Figs. l2 and 13 is provided and in this construction an insulating element |90 is rotatably mounted on the commutator shaft |55 and connected to the shaft by means of an arcuate slot I9| in the insulating element,`which cooperates with a pin |92 secured to collar |92 rigid with the shaft. By means of this arrangement a partial rotary movement of the insulating element with respect to the shaft |55', within the limits of the length of the slot l9|, can be secured. Normally however, the pin |92 is located at the clockwise end of slot |9| and consequently shaft |55 will rotate the insulating element constantly. Assuming that the commutator brushes |50 and |53 are about to engage the exposed insulating tooth |51 on the insulating element |90, or that they are in engagement with the insulating tooth, and it is desired to prevent interruption of the electrical circuit. through the motor it is only necessary to rotate the insulating element |90 with respect to the shaft |55', and then the commutator brushes will be relatively moved over the exposed tooth |51 of the insulating element and brought into engagement again with the metal sleeve thereon. For the purpose of providing a manual means for so rotating the insulating ele. ment with respect to shaft |55', an arm I 93 is provided which has a projecting end portion |94 adapted to engage a pin |95 on the insulating -element. Arm |93 is slidably mounted in a bracket |95 secured to the clock casing interiorly thereof, and at its lower end is pivotally connected to a bell crank lever |96, which in turn is pivotally connected as indicated at |91, to the wall of the clock housing.' The opposite end of rthe bell crank engages the frusto conical elementV |8| and normally is maintained in such position that the projecting end portion |94 of arm |93 is disposed out of the path of movement of pin |95, by means of a spring |98 connecting the bell crank to the wall of the clock housing.

From the above description it is apparent that if the clock motor has so moved the commutator that the commutator brushes are about to engage the exposed part of the insulating element on the and heat dissipating means, said system being 1 limits of the slot commutator, or that the commutator brushes are in engagement with the exposed insulating element, and it is desired to preventl engagement of the commutator brushes with the insulating ele ment or reconnect the commutator brushes with the metal sleeve of the commutator, it is only necessary to push button whereupon the insulating velement will be rotated within. the |9| and the brushes again brought into engagement with the metal sleeve at |58. Then the insulating element will remain in a stationary position until the clock so operates that the pin |92 reengages the insulating element at the clockwise end of the slot lili.

When a downward movement of the base 20 in the manner previously described has partially occurred the connector |39 is removed from the switch-box 86 although it should be understood that an automatic disengagement of the conne'ctor from the switch box may be effected when the base 20 is movedv downwardly and that an arrangement may be provided whereupon the plug will automatically reengage the switch box when the base again is moved into its operative position.

According to Fig. 1l the drip pan 53 is provided with a pair of

brackets

200 and 20| having flanged portions 202 and 203 which serve as guides and retaining means for the drip cup 5d. When it is desired to remove the drip cup 56 it is only necessary to move it toward the door I3 of the refrigerator and beyond the end of the

bracket members

200 and 20|. This arrangement is desirable because it provides a means separately of the shelf Hi in the refrigerator, for supporting the drip cup. l

It is apparent that the thermal control of the refrigerator may be adjusted by adjusting the tension on the spring |02 in the switch box as shown by Fig. 4 by moving the screw |06 through,

vshown by Fig. 2, with respect to the evaporating unit 46 which disposes the bulb 93 in variable positions with respect to the evaporator unit. It is also apparent that movement of the bulb 93 and arm 92 in this manner may easily be made by opening the door I3 of the refrigerator and manually moving the arm in the desired manner.

Formal changes may be made in the specific embodiment of the invention described without departing from the spirit or substance of the broad invention, the scope of which is commensurate with the appended claims.

I claim: Y

1. A refrigerator cabinet having a refrigerated space, a refrigerating system including a support swingably mounted within said cabinet having heat absorbing means on one side and heat dissipating means on the other side, said support being swingable about an axis adjacent the rear wall of said refrigerated space so as to bring the system into operative position with said heat absorbing means located in said refrigerated space and said heat dissipating means outside of said refrigerated space.

2. A refrigerator cabinet having a refrigerated space therein and an opening through whichv said refrigerated space is accessible, a refrigerating system pivotally mounted adjacent the rear inner wall of said cabinet on a substantially horizontal axis, and including heat absorbing means insertable through the opening and being swingaoa'mea able into horizontal operative position with said heat absorbing means located in said refrigerated vspace therein, a door opening through which said space is accessible, and a second opening above said refrigerated space, a removable wall section for closing said second opening and being removable through the door` opening, a hinge part attached to the inner rear wall of said refrigerated space, a hinge part attached to said removable wall section and adapted to detachably engage the first hinge part for coaction therewith, heat absorbing means mounted on said removable wall section on its refrigerated space side, heat dissipating means including a condenser, mounted on the opposite side of said wall section, said condenser being so positioned that when the wall section is hinged into position to close said second opening, said condenser will be positioned above and adjacent to the rear wall of said refrigerated space.

4. In a refrigerator cabinet having a refriger= ated space, a door opening and a unit opening, a removable refrigerating system, and detachable means on said cabinet and refrigerating system respectively for pivotallyl supporting the latter in the cabinet, said system being adapted to be pivoted into operating position by a forward and upward movement of said system from the interior of said refrigerated space and partially through said unit opening. l

5. In a refrigerator cabinet having a refrigerated space therein, a refrigerating system including heat absorbing and heat dissipating means adapted to be pivotally attached to said cabinet adjacent the rear wall thereof, said system being swingable so as to bring it into operative position with said heatv absorbing means located in the upper portion o'f -said refrigerated space and said heat dissipating means located outside of said space.

6. In a refrigerator cabinet having a refrigerated space therein, and a door for access to said space, a refrigerating system including heat absorbing and heat dissipating means adapted to be pivotally supported by said cabinet adjacent the rear wall thereof, said system being insertable through said door for such pivotal attachment and then swingable so as to bring it into operative position with said heat absorbing means located in the upper portion of said refrigerated space and said heat dissipating means located outside of said space.

7. A refrigerator cabinet, a removable refrigerating system installed in said cabinet for the purpose of cooling the same, a latch designed to hold said system in its operating position in said cabinet, a baffle in said cabinet adjacent to the heat absorbing portion of said system, and a common means for securing said baiile in said cabinet and locking said latch so that said unit is securely locked in position.

8. A refrigerator cabinet, a refrigerating system removably installed in said cabinet to cool the same, a hinge part attached to the rear inner lining of said cabinet, and a hinge part attached to said system, said hinge parts being cooperative for the purpose of locating'said system in said cabinet and guiding it into operative position while it is being installed in said cabinet.

9. A refrigerator cabinet, a refrigerating system removably installed ln said cabinet by first inserting said system into the interior of said cabinet and then passing it partially through a Wall of the cabinet, andra baille attached to said cabinet adjacent to that part of said system which extends into the interior of said cabinet in such manner that in the event of said system becoming loosened from said cabinet said baille will prevent said system from falling into and damaging the interior of said cabinet.

10. In a refrigerator cabinet, a removable unit refrigerating system including an evaporator, a baille pan disposed below and in front of the evaporator and supported by the cabinet, and a drip storage receptacle suspended from the bafe pan.

11. A refrigerator comprising a cabinet having upper and lower substantially horizontal walls and' front and rear walls, said front wall having an access opening therein and one of the horizontal walls also having an opening, a heat insulating closure for the last-mentioned opening, means releasably but hingedly connecting the closure to the cabinet adjacent the rear edge of said second opening, heat absorbing means on that side of the closure next to the space within the cabinet, and heat dissipating means on the opposite side of the closure, said closure and heat dissipating and absorbing means being removable frontwardly through the access opening in the front wall, by swinging the closure vertically and about its hinge connection, into the space within the cabinet and then forwardly moving it through the access opening in the front wall.

l2. A refrigerator comprising a cabinet having upper and lower substantially horizontal walls and front and rear walls, said front wall having an access opening and the upper of the horizontal walls having an opening therein, a heat insulating closure for the last-mentioned opening, means releasably but hingedly connecting the closure to the cabinet adjacent the rear edge of the last-mentioned opening, heat absorbing means on that side of the closure next to the space within the cabinet, and heat dissipating means on the opposite side of the closure, said closure and heat dissipating and absorbing means being removable frontwardly through the access opening in the front wall, by swinging the assembly downwardly about the hinge connection and into the space within the cabinet, and then forwardly moving it through the access opening in the front wall.

13. A refrigerator comprising a cabinet having an opening in one of its Walls, a closure for such opening, means hingedly connecting the closure to the cabinet adjacent one edge of the opening, heat dissipating means on the outer side of the closure, heat absorbing means on the inner side of the closure, a spring pressed latch for normally and releasably holding the closure in its closing relation to the opening, and secondary means for holding the closure in a closed position in the event the latch fails to function.

14. A refrigerator comprising a cabinet havl ing an opening in one wall thereof, a closure for such opening, heat dissipating means on the outer side of the closure, heat absorbing means on the inner side of the closure, and means within the cabinet and hingedly connecting the clo- 1| sure to a wall of the cabinet so as to permit swinging movement of the closure and heat absorbing and dissipating means thereon into the space within the cabinet, said hinging means being located in substantially spaced relation to 1: the plane of the opening and the closure when the latter is in closed position, so as to prevent interruption to the normal swinging action of the closure by engagement of the heat absorbing means with a wall of the cabinet. 2(

15. A refrigerator comprising a cabinet having upper and lower walls, one of said walls having an opening therein, a closure for such opening, heat absorbing means on that side of the closure next to the space within the cabinet, heat 2: dissipating means on the other side of the closure, means with the cabinet and hingedly connecting the closure to a wall of the cabinet, substantially in alignment with the inner extremity of the heat absorbing means when the closure 3U is in its closing position, whereby upon swinglng the closure about its hinging axis, the heat absorbing means normally will not engage a wall of the cabinet and interrupt the normal swinging action. 35i

16. A refrigerator comprising a cabinet having an opening in one of its walls, a closure for such opening, means hingedly connecting the closure to the cabinet for swinging movement from its closed position into the interior of the cabinet, .143 heat dissipating means on the outer side of the closure, heat absorbing means on the inner side of the closure, releasable latching means for normally holding the closure in closing relation to the opening, and secondary means for holding .15 the closure in its closed position in the event the rst latching means fails to function.

17. In combination, a refrigerator cabinet, a removable refrigerating system installed in said cabinet, an electrical circuit leading to said sys- 5o tem and including contactors on the cabinet, and a temperature responsive switch in and mounted on the removable system, a housing for the switch, and exposed electrical contactors on the housing and connected to the switch, said last men- 55 tioned contactors mating with and adapted to be releasably connected to the rst contactors.

' GLENN MUFFLY.