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Oct. 8, 1946. A. H. EBERHART 2,408,972 AIR CONDITIONING APPARATUS Filed Dec. 6, 1944 2 Sheets-Sheet 1 26 MIN 0.4 Se 7 Plant SE 84 INVENTOR ‘ nmua h’. Essa/mar. ‘ AQZZRNEY Get $9 3946. _ A, H, EBERH-ART ' AIR 7 2,408,972 CONDITIONING APPARATUS ' Filed Dec. 6, 1944 2 Sheets-Sheet 2 :1 INVENTOR ' ! HRTHUR H. EBERHFI RT. 55 BY 7?‘ / Wyh - ATTORNE‘Y- I 2,408,972 Patented Oct. 8, 1946 UNITED STATES PATENT OFFICE 2,408,972 AIR CONDITIONING APPARATUS Arthur H. Eberhart, Spring?eld, Mass, assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a. corporation of Pennsylvania Application December 6, 1944, Serial No. 566,797 5 Claims. (01. 62-129) 1 My invention relates to an air conditioning unit of'the type adapted to be mounted on the window sill of a room. One object of my invention is to produce an improved unit of the type set forth, Another object of my invention is to produce 2 rear ?anges 34 and 36. A removable decorative cover including a top wall 38, side walls 48 and 42, and front and rear walls 44 and 46, coacts with the tray to form a casing completely enclosing the refrigerating apparatus. The casing is di vided transversely by a partition 48 to form an outer compartment extending into, or in the an improved air conditioning unit which is capa direction of, the outside atmosphere, and an inner ble of being readily adjusted to condition and compartment extending into, or in the direction recirculate room air only, to introduce condi tioned outside air only to the room, to condition 10 of, a room the air of which is to be conditioned. The partition 48 extends upwardly from the bot a mixture of outside air and room air and deliver tom wall 28 of the tray to Within a short distance the conditioned mixture to the room, or to ex of the top wall 38 of the decorative cover. As haust air from the room to the outside atmos will be seen from Fig, 1, the outer compartment phere. Another object of my invention is to produce 15 houses the compressor, the condenser, the motor M and the condenser fan 22. The inner com an air conditioning unit which can be adjusted partment houses the evaporator, the fan 24 and to effect the various air ?ows above set forth by other parts which will be later described. The the manipulation or setting of a single readily inner compartment is also provided with a-top accessible control knob or handle. Another object of my invention is to produce 20 wall 50, which coacts with the top wall 38 of the decorative cover to form a passage 52, and a front an inexpensive construction for attaining the wall 56 which coacts with the front wall 44 of foregoing objects. the decorative cover to form a passage 56. The These and other objects are effected by my in passage 52 and. passage 56 communicate with the vention as will be apparent from the following room through an inlet 58. The outer end of 25 description and claims taken in connection with the passage 52 communicates with the top of the the accompanying drawings, forming a part of outer compartment, as clearly shown in Figs. 3 this application, in which: Fig. 1 is a diagrammatic view, partly in top plan and partly in horizontal section, of an air conditioning unit embodying my invention; Fig. 2 is a vertical section of the unit shown in Fig. 1, the view being approximately on line II-II of Fig. 1; and Figs. 3, 4 and 5 are diagrammatic views illus trating three positions of the dampers for con~ trolling the air flow through the unit. ' In Figs. 1 and 2 of the drawings, I illustrate a refrigeration system including an evaporator it, a compressor I2 and a condenser 14. The liquid refrigerant flows from the condenser to the evaporator through a pipe it of small diameter and the evaporated refrigerant is sucked from the evaporator by the compressor through a pipe it. The compressed refrigerant gas flows through a pipe 29 to the condenser where it is cooled, lique?ed and returned to the evaporator in the to 5. ' - The side wall 42 of the decorative cover adja cent the blower 22 is provided with an'outside air inlet 60 through which the condenser fan22, under certain conditions of operation, draws out side air for cooling the refrigerant gas flowing through the condenser. The condenser fan is adapted simultaneously to draw outside air through an opening 62 in registration with the compressor 50 that ‘the air drawn through the opening 52 serves to cool the compressor. Under other conditions of operation, the condenser fan is also adapted to draw air from the room. The air moved by the condenser fan 22, be it drawn through either or both of the. openings 60 and 62, or from the room in a manner hereinafter explained, is blown over the condenser and is discharged to the outside atmosphere through an outlet 64. The evaporator fan 24 is provided with a spiral well-known manner. A motor M drives a con shroud 66, the discharge end of which leads to denser fan 22 for blowing air over the condenser, the bottom of the evaporator, as best shown in and an evaporator fan 24 for blowing air over the 50 Fig. 2. The air blown over the evaporator is dis evaporator. I charged to the room through an outlet 88 which The refrigerating system above described is is preferablyprovided with a grille ‘H3. The front mounted on or in a tray which may be secured Wall 54 of the inner compartment is provided with directly to the sill 26 of a window, or to other a fan inlet 12 communicating with the passage supporting means forming part of, or carried by the window structure. The tray includes a bot- 55 56 through a suitable ?lter ‘l4. In order to direct and regulate the ‘flow 'of air tom wall 23, side ?anges 30 and 32, and front and 2,408,972 3 4 conditioned by the unit thus far described, I provide a damper ‘I5 for controlling the inlet 58, treme right-hand position, and in Fig. 5, the arm is shown in its extreme left-hand position, it will be understood that intermediate adjustments of a damper ‘I8 for controlling the passage 52, and a damper 80 for controlling the outside air inlet the arm can be effected by appropriate rotation 80. Also, I so construct and arrange the dampers of the knob 84. and their adjuncts that they are all adjusted to For example, in the intermediate position of the desired position by a simple movement of a the arm 94 illustrated in Fig. 3, the dampers ‘I6 single, readily accessible control knob 84. As and 80 are partly open, the chain I I2 is slack and shown, the damper ‘I8 is hinged to a suitable sup the damper ‘I8 is closed by the spring 92. port 88 and is biased to a position Opening the Operation inlet 58 by a spring 88. The damper ‘I8 is hinged to a suitable support 90 and is biased to a posi When it is desired to condition and recirculate tion closing the passage 52 by a spring 92. room air only, the knob 84 is rotated to a posi In order to move the dampers ‘I6 and ‘I8 against tion indicated on an index plate, not shown, to the action of their respective springs, and in order 15 adjust the parts as shown in Fig. 3. In this posi— simultaneously to regulate the position of the tion, the evaporator fan 24 draws room air damper 80, I provide an actuating arm 94 which through the inlet 58 and ?lter ‘I4, passes the air includes a horizontal portion 90 and a pendant over the evaporator and discharges it into the vertical portion 98. The horizontal portion 98 room through the grille ‘I0. Also, in this posi extends through guide slots I80 formed in the tion, thedamper 80 is in partly open position front and rear walls of the inner compartment, and the condenser fan 22 draws outside air and the vertical portion 98 extends downwardly through the openings 60 and 82 and discharges through the passage 55. The actuating arm is it over the condenser and through the outlet 64. connected to one end of a chain or other ?exible The path of flow of the air is indicated by the element I02, the other end of which is secured to arrows in Figs. 1 and 3. a pulley I04 on a shaft I06 rotatable by the knob When it is desired to introduce conditioned, 84. The outer end of the horizontal portion of outside air only into the room, the knob 84 is the actuating arm is connected by a, pivoted link rotated to another indicated position to adjust I08 to the damper 80. The actuating arm as a the parts as shown in Fig. 4, in which the damper whole is biased to the right as viewed in Figs. 30 ‘I6 is in a position fully closing the inlet 58, the 3 to 5, by a spring I I 0. The lower end of the ver damper ‘I8 is in a position in which the passage tical portion 98 of the actuating arm abuts against 52 is unobstructed and, the damper 80 is in full the damper ‘I6 in all positions of said arm. The open position. The evaporator fan 24 now draws shaft I06 is provided with one ‘or more friction outside air through the opening 80, the passage washers, not shown, for retaining the shaft in any 35 52 and the ?lter ‘I4, passes it over the evaporator position to which it is adjusted. and discharges it into the room. The full open The-horizontal portion 96 of the actuating arm ing of the damper 80 permits admission of enough is also connected to one end of a chain or other air to satisfy the requirements of both the con ?exible element II2 which passes between guide denser fan 22 and the evaporator fan 24. The rolls I I4 and the other end of which is connected path of ?ow of the air is indicated by the arrows to one end of a lever IIG, the other end of which in Fig. 4. is secured to the damper ‘I8. A mixture of room air and outside air, in vari By turning the knob 84 so as to rotate the shaft ous proportions, for conditioning, may be ob I 06 in counterclockwise direction, as viewed in tained by rotating the knob 84 to bring the arm Figs. 3 to 5, the chain I02 is partly wound upon 45 94 to a suitable position intermediate the posi the pulley I04 and .the arm 94 is thus pulled to tions shown in Figs. 3 and 4. Upon moving the the left, against the action of the spring I I0, The arm 94 to the left from the position shown in vertical portion 98 of the arm is now somewhat Fig. 3, the damper ‘I8 gradually opens, to pro retracted from the damper ‘I6 and permits the vide an increasing amount of outside air, and the spring 88 to open the damper ‘I6 to a correspond 50 damper ‘I8 gradually closes, to reduce the amount ing extent, as shown in Fig. 3. of room air and to transfer the suction effect of Further rotation of the shaft I05 in counter the evaporator fan 24 to induce the ?ow of out clockwise direction, further winds the chain I02 side air through the passage 52 past the damper on the pulley I04. This moves the arm 84 still ‘I8. When the position of Fig. 4 is reached, the further to the left and further retracts the ver 55 admission of room air has been reduced substan tical portion 88 thereof so that the spring 88 tially to zero and the outside air has been in moves the damper 16 to its fully open position, creased substantially to 100 per cent. as shown in Fig. 5. When it is desired to exhaust air from the By turning the knob 84 so as to rotate the shaft room, the control knob 84 is rotated to still an I06 in clockwise direction, the chain I02 is un 60 other indicated position, to bring the parts to wound from the pulley I04, thus permitting the spring I I0 to move the arm 94 to the right. The spring IIO being stronger than the spring 88, the the position shown in Fig. 5 in which the dampers ‘I6 and 18 are moved to full open position. It will be noted that, in this position of the actuating vertical portion 98 of the arm moves the damper arm, the damper 80 is in its maximum closing ‘I5 in a direction to close the inlet 58. 65 position. Therefore, in order to satisfy the re The movement of the arm 94is transmitted to quirements of the condenser fan 22, air is drawn the damper ‘I8 through the chain H2 and to the from the room, through the inlet 58 and passages damper 80 through the link I08. Thus, if the arm 56 and 52, as well as from the outside atmosphere 94 is moved su?iciently to the right, the dampers through the inlet 62. The path of flow of the ‘I8 and 80 are moved to their respective fully air is partly indicated by the arrows in Fig. 5. open positions, as shown in Fig. 4. If the arm 94 If desired, the rod 94 may be omitted and the is moved su?iciently to the left, the damper ‘I8 shaft I06 may be provided with separate pulleys is opened and the damper 80 is closed, as shown which will be connected to the dampers ‘I6, ‘I0 in Fig. 5. . While in Fig. 4 the arm 84 is shown in its ex and 80 by chains or other ?exible elements in a 75 manner such as that illustrated in my prior Pat 2,408,972 6 ent No. 2,343,122‘ of February 29, 1944. Also, if desired, the damper 80 may be mounted for slid ing movement against the side wall 42 instead of the pivoted mounting of the damper illustrated. While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of vari ous changes and modi?cations without departing from the spirit thereof. What I claim is: 1. In a room air conditioning unit, a casing having a ?rst portion and a second portion, a ?rst heat exchanger in said ?rst portion, a second heat exchanger in said second portion, an outside air inlet for admitting air from the outside at mosphere to said ?rst portion, an air outlet lead ing from said ?rst portion to the outside atmos phere, a fan for drawing outside air through said outside air inlet into contact with said ?rst heat exchanger and discharging it through said outlet to the outside atmosphere, a room air inlet for ad mitting air from a room the air of which is to be conditioned to said second portion, a room air outlet leading from said second portion for dis means biasing said damper to a position in which said room air inlet is open, a second damper for controlling said passage, means biasing said second damper to a position in which said pas sage is closed, an actuating member adapted simultaneously to position both of said dampers, and means biasing said member to a position in which said first damper is moved to a position closing said room air inlet and said second 10 damper is moved to a position in which said passage is open. _ 3. The structure recited in claim 2 together with a third damper for controlling said out side air inlet, and means connecting said third damper to said actuating member, said means being so constructed and arranged that said third damper is moved to a position partly or wholly closing said outside air inlet according to the position of said member and in predeter mined relation to the position of said ?rst and second dampers. 4. The structure recited in claim 2 in which said actuating member is movable to three dif ferent positions and in which said dampers and said member are so constructed and arranged charging air to said room, a fan for drawing room 25 that in one position of said member said ?rst air through said room air inlet into contact with damper is partly open and said second damper said second heat exchanger and discharging it is fully closed, and in a second position of said through said room air outlet back into the room, member said ?rst damper is fully closed and said a passage connecting said room air inlet with second damper is fully open, and in a third posi said outside air inlet and said outside air outlet, 30 tion of said member said ?rst and said second and means for regulating the flow of outside air dampers are open. or room air into contact with either of said heat 5. In a room air conditioning unit, a casing exchangers and into the room or to the outside having a ?rst compartment and a second com atmosphere, comprising a ?rst damper for con 35 partment, a ?rst heat exchanger in said ?rst trolling said outside air inlet, a second damper compartment, a second heat exchanger in said for controlling said passage, and a third damper second compartment, an outside air inlet for for controlling said room air inlet, and actuating admitting air from the outside atmosphere to means for positioning said dampers, said actuat said ?rst compartment, an air outlet leading ing means and said dampers being so constructed 40 from said ?rst compartment for discharging air to the outside atmosphere, a room air inlet for and arranged that, in one position thereof said admitting air from a room to said second com inlets are open and said passage is closed, where partment, there being a discharge opening lead by outside air is circulated around said ?rst heat ing from said second compartment for discharg exchanger and room air isv circulated around said second heat exchanger, in a second position of 45 ing air back to said room, a ?rst fan for draw ing air through said outside air inlet into con said actuating means and said dampers said room tact with said ?rst heat exchanger and dis air inlet and said passage are open and said out charging it through said outlet, a second fan side air inlet is at least partly closed, whereby far drawing room air through said room air inlet room air is withdrawn through said room air in into contact with said second heat exchanger let and said passage and discharged to the at and discharging it back into the room through mosphere, and, in a third position of said damp said discharge opening, a wall structure de?n ers and said actuating means, said outside air ing a passage connecting said compartments, inlet and said passage are open and said room air and means for controlling the ?ow of outside air inlet is at least partly closed, whereby outside air is drawn through said outside air inlet and said 55 and room air into and through one or both of said compartments and through said passage, passage into contact with said second heat ex said means including a ?rst damper for con changer and is discharged into said room. trolling said passage, a second damper for, con 2. An air conditioning unit comprising a cas ing, means dividing said casing into an inner trolling said room air inlet, a member movable compartment and an outer compartment, re 60 through a range of movement from a ?rst posi tion to a second position and effecting move frigerant liquefying means disposed in said outer ment of said second damper from full open to compartment, refrigerant evaporating means full closed position upon movement from its disposed in said inner compartment and con ?rst to its second position, said member and nected in refrigerant flow relation to said re frigerant liquefying means, means providing a 65 said ?rst damper being interconnected so that, when said member is in an intermediate position passage connecting said compartments, there be between said ?rst position and said second posi ing an outside air inlet leading to said outer tion and said second damper is partly open, said compartment, an air outlet leading from said ?rst damper is closed and so that, as said mem outer compartment to the outside atmosphere, at room air inlet leading from a room, the air 70 ber is moved from said intermediate position to either said ?rst position or said second posi of which is to be conditioned, to said inner com tion, said ?rst damper is moved to open posi partment, and a conditioned air outlet leading tion. from said inner compartment to said room, a ?rst damper for controlling said room air inlet,~ ARTHUR H. EBERHART.