US2617348A - Ventilating unit - Google Patents

Description

Nov. 11, 1952 0, A SUTTON 2,617,348

VENTILATING UNIT Filed Dec. 2, 1949 3 Sheets-Sheet 1 5MM/wam ffm/AME .5' /4 2/ Nov. 11, 1952 o. A. SUTTON VENTILATING UNIT 3 Sheets-Sheet 2 Filed Dec. 2,v 1949 Nov. 1l, 1952 o, A, SUTTON 2,617,348

VENTILATING UNIT Filed D60. 2, 1949 3 Sheets-Sheet 3 INVENTOR. l y l .-/l BYOULS'A. uton wwuvv Patented Nov. 11, 1952 VENTILATING UNIT oms A. Sutton, Wichita, Kans., assigner mijne 0. A. Sutton Corporation, Inc., Wichita, Kans.,y

a corporati'onofKansas ApplicationD'ecember 2, 1949',- Serial No. l130,621-

(c1.V sis-921).

Claims;

My present inventionrelates to window venti-Y lating units which are particularlyadapted to be associated with windows of the vertically moving type but which may be readily` associated'with other types of windows' or placedin openings in walls especially prepared for'thepurpose.

A principalobject of the'in'vention is to. provide a window Ventilating unit including av movable fan unitin which anairpropeller. and a directly connected motorv are so .arranged within a cowl surrounding the propeller4 as'.to create aV stream of moving ai): which maybe directed across a room in any desired .mannerthereby materially increasing the comfort'of occupants of the room by placingit within4 their power to direct the most rapidlymoving air horizontally in their direction or otherwise as desired, either downwardly across theoor or upwardly against the ceiling of the room.`

Another object of thev present invention is vto provide a construction of the foregoing type in which the position ofthefan'unit'includingv the surrounding cowlmay be rapidly reversed even while the propeller is in Operation' sothat air may be exhaustedfromthe.` room with a minimum of effort on the part of the occupant, thereby making it p ossible'to clearstale air orV odors from the room at any time without'requiring the use of tools or specialknowledgeof `mechanical operations. v

A further object of the present inventionis to provide a window Ventilating unitV in'which'the direction of the airstreamv across a'roonr may be changed from the horizontaltozany upwardinclination up to substantially 60Y degrees while the window is rpartially closedbehind the vvVentilating unit, thereby making itv possibleforthe windowA to be opened slightly duringver-y cold weather and the cold stream of air-*to be directedupwardly into thewarmer'l stratasA of 'air iny the ceiling area of a room beforegently circulating downwardly through thevzone. ofoccupancy vof the room, thereby avoiding.thercreation of kcold drafts while permitting-,constant fresheningY of the air in a substantially closed froom;

A further object of the present invention isgto provide al window Aventilatingunit ofvthe char-- acter described inv which at all times air from the interior of the room is .caused torecirculate and becomeadmixed withthe streamV of fresh air being drawn into the room throughan open-window, thereby maintaining moreeven tempering of the air within a. room.A I

A further object of the present invention is to provide a window Ventilating unit which is easy to installV andN which may be'readil'y adjusted to;

nt windows and the like ofvarying'widthsf A further z object ofy the present invention i s to provide aiwindow'VentilatingV unit in which meansr are providedto limit' the extent of' downward inclination of thefstream of air produced thereby sok asA to aidl the creationfof; comfortable conditions within the room5in=spiteof the lacl;` of technical knowledge-off proper airconditioning procedure-by the average ovccupantfoftheroom.

A further objectof the present inventionfis` to provide-a sturdy construction vof` theforegoing character *withfa minmumfamount '-of lfabricated partsg-jinwhichj thepositiony the fanlmay be instantaneously adjusted and `by. means-of which the fan may be retained in any-adjusted position without being` dislodged therefrom due to vibration.

The foregoingandother objects and advantages of the` presentV inventiony may. bei more readily ascertainedfroniinspection of the following specication takenlin'connectionwith the accompanying, drawing wherein like numerals refer to like .partsthroughout,v while the features ofn'ovelty willbe more distinctly pointed out in the appen'c'led claims. l y

In the drawing, Fig; 1 isa front view, in elevation, of awndw-ventilating'unit conforming to the present invention; Y y

Fig. 2 is arear View, ir"1`1elevation,A .with parts broken away to show interio'rdetails;v

Fig.. 3 is a horizontal section, ,on an enlargedl scale, taken substantiallyy along line 3--3 of Fig'..2; y

Fig. Llis a horizontal section, on an enlarged scale, taken substantially along line' IIL-fl` of Fig. 1;

Fig. 5 is a sideview, in'elevation, with'aV corner broken away to showinterior details; ,K

Fig. 6" is a Vertical section, on'an enlarged scale, taken substantially' along line 6-6 of Fie. 2;

Fig. '7" is a sideview; in elevation; similar "to Fig. 5 but showing the fan unit in' reversed position in order that the Ventilating unit' may be used 'as anexh'aust'unit;v p n Fig.V 8 is ajschematic viewjshowing the normal operation ofthe unit as a Ventilating unit directing air horizontally across a roomjA y Fig. 9'isajviewv similar toFig;` lSjshowing the unit in operation asan exhaust unit; p

Fig. IO-is ja' View similar vto Y'Figr vshowing the unit in action as lan aircirculatingandwfresh vair admittingunit 'during'jcold` Weather; and"v Fig. 11 is a viewv similar to Fig. 8 showing the unit in'- operation duringhot weather.`

The 'window Ventilating Vunit comprises a housingv generally "indicated bythe numeral I 0 and inpreferably formed by bending the front wall rearwardly, a bottom wall I5 provided by a flanged plate having its flanges embracing the front and side wall lower edges, and a top wall I6 provided by a similar flanged plate. The upright rear edge of the side wall I3 is flanged inwardly to provide a vertical stiffener ange I1 and a, similar vertical stiffener flange I8 is provided at the rear edge of the side wall I4. Longitudinally extending top and bottom braces I9 and 20 are welded or otherwise affixed at their ends to the flanges I1 and I3 to provide a rigid housing structure in which the fan unit is mounted.

The fan unit comprises a cowl formed of an outer, annular shell 2| having its end edges bent inwardly to embrace the end edges of an inner, annular shell 22, the outer shell being outwardly convex and the inner shell being outwardly concave in order to provide an aerofoil construction of ring shape, as disclosed and claimed in my copending application, Serial No. 120,504, led October 10, 1949. A'plurality of radially extend- Ving arms 25 are attached to the inner surface of shell 22 as by means of screws 25, the arms being attached at their inner ends to a motor mounting ring 21 through resilient connections including rubber grommets 28 and screws 29. The ring 21 embraces the outer surface of a blower motor 30 and the grommets 28 tend to prevent the transmission of noise and vibrations through the arms 25. The arms 25 are offset slightly at intermediate points to provide means for concentrically locating an air directing funnel 3| through which the arms 25 pass and which are isolated therefrom by means of rubber grommets 32. The inner shell 22 and the funnel 3| provide highly eicient air directing means embodying the principles of the patent to Odor et al., No. 2,330,907, issued October 5, 1943, whereby air is most efficiently introduced to an air impeller comprising a hub 35 mounted upon the shaft 36 of the motor and having a plurality of radially extending blades 31 located within the constricted portion of the cowl and arranged to direct air forwardly through the constricted end of the cowl. A grille 38 is preferably mounted across the constricted end of the cowl as by means of spring -clips 39 and radial grille members 40, as set forth and claimed in my copending application, Serial No. 120,503, led October 10, 1949. A plurality of radially extending, substantially W-shaped rods 4| are mounted upon the inner end of the funnel 3| so as to prevent the entry of curtains or the like into engagement with the fan blades from the rear end of the fan unit.

The fan unit including the cowl, funnel, motor, propeller and associated parts, is pivotally mounted for rotation about a transverse axis normal to the longitudinal axis of the cowl. The pivotal axis of the fan unit is preferably horizontal for reasons to be described and is arranged close to the inner surface ofthe front wall I2 of the housing and substantially in alignment with the center of gravity of the fan unit. In order that the cowl may project through the front wall, the wall is provided with a circular opening 45 of slightly greater diameter than the largest diameter of the cowl, the edge thereof being preferably flanged rearwardly so as to prevent abrasion or cutting of fingers which might come in contact therewith. The means for providing the pivotal axis include a pair of horizontally extending trunnions 50 and 5I, which trunnions are preferably short sections of tubes having their inner ends reduced to provide shoulders against which the surface of the shell 2| may be seated when the reduced ends are passed through closely fitting openings in the shell. The reduced ends which protrude into the shell are peened over or welded or soldered to the inner surface of the shell so as to provide outwardly extending, tubular trunnion members lying along the horizontal diameter of the fan unit.

Each of the trunnions is rotatably mounted in pivot means including an arcuate bearing 52 formed in the upper end of a fixed bracket 53 having its lower end connected to an inwardly offset portion of the lower portion 54 of the lower horizontal member 20 by means of a screw 55 and having its upper end attached to the front wall I2 by means including a pair of long studs 56 passing through the wall I2 and having nuts 51 thereon for engaging the bracket 53. The trunnion is retained in the arcuate bearing 52 by a strap including an arcuate intermediate portion and having a pair of holes at its ends through which the studs 56 pass. The ends of the strap 60 are resiliently urged toward the front wall I2 by strong springs 6I compressed between the ends of the strap and washers 62 retained on the ends of studs 56 by outer nuts 63, the nuts providing means whereby the compression of f springs 6I may be adjusted to the extent required to prevent accidental rotation of the fan unit but to permit rotation thereof upon the application 0f manual pressure to any protruding portion of the fan unit.

The bearing portion 52 of the bracket 53 is defined by axially extending edge portions 65 adjacent the upper edge of the trunnion and 66 adjacent the lower edge thereof, said axially extending portions being engageable by the protruding end of a limiting pin 61 which is shown in full line (Fig. 6) as limiting the position of the fan unit by engagement with the axial edge 65, and in dash line as limiting the movement of the unit at the opposite extreme. The arcuate bearing 52 or the angular distance between the axial portions 65 and 66 is less than 180 degrees and the arrangement of the pin 61 to the fan unit is such that the fan unit may be rotated to face outwardly at one extreme, and may be inclined downwardly at about 30 degrees at the other.

The pin 61 during rotative movement travels through a longitudinally extending slot 68 in the strap 60, thereby providing means for preventing lateral displacement of the fan unit ,with respect to the housing.

- mounted in the inner shell 22 and a rubber grommet 12 mounted in the funnel 3| to reach the motor. The cable is conveniently held against the flange I8 by a tongue clip 13 fastened thereto, and from there extends to a control box 14 retained againstthe inner surface of the front wall I2 by a bracket 15. A switch knob 16 is connected to the operating shaft (not shown) of the control box which extends forwardly through an opening in the front wall and is preferably of the type which may be moved t0 a plurality of different positions in order to control the speed of the motor, the motor preferably being of a type which may be operated at different speeds. Power is led to the control box through a supply cable 11, also retained by the tongue 13, which passes through a rubber grommet 18 in theside wallV I4 to a source of-power such`r as a plug-in connector (not shown) so that the unit may be moved from window to window. The opposite flange vIl is preferably providedwwith ya clip tongue i9 so that units may be fabricated with right or left-hand connector, cables asdesired. The construction isA such that rotation of thevfan unit about itshorizontalaxisvmay be accomplished without interference and without requiring stoppage of the motor, the cable 'IIJ merely slipping Withinthe trunnion 5B as the fan unit is rotated.

In order that the unit may be mountedv inv a window opening as quickly and conveniently as possible, the rear edges of. the upperv and lower flanged plates land I6 areattached to longitudinally extending, horizontal channels 8l and 8'2 respectively,l with the channels facing each other across the outer surface of the housing.A A pair of side wing panels 83 and84 are mounted on the unit by having upper andllower channeled edges thereof, 85 and 86jrespectivelyslidably engaged within the upper and lowerl channels 8| and 82 vfixed to the housing.A The inner edge of each panel has a pair of horizontally extending bars 8l welded thereto and projectingtinwardly therefrom. The inner end ofY each bar 81 is notched at 88 to provide means for attachingone end of a long tension spring 89,'the oppositev end of which is attached to a hook tongue SUstruck inwardly from the inner stiiener flangevat the vertical edge of the adjacent side wall. A pair of studs 9| projecting inwardly from the side wing panel engage the inner edge of the side wall flange to limit outward movement of the side wings. Inward movement of the panels islimited by a pair of handles 95 which'project forwardly from the outer edges of the side wing panels. The outer edge of each panel is flanged rearwardly at 95, the upper end of the flange projecting upwardly and being provided with ar keyhole slot 9i. which may be engaged with a lscrew or the like mounted in the window casing or the like so as to prevent the unit from falling forwardly from an opening in which itis mounted. Of course, with some windows the flanges 96 -of the side wing panels may extend into sash grooves or the like in the window opening, thus eliminating the necessity for engagement of screws withthe keyhole slots 91. The inner edge of eachvof the side wing panels is provided with an arcuate` recess 98 of substantially the same diameter as the opening 45 and aligned therewith so that the side wing panels may be moved inwardly toward the center of the unit to a substantial extentwithout interfering with air movement through the housing.

In order to mount the unit within a window opening or the like, the handles 95 may be employed to lift the unit, in so doing the hands being forced toward each other to slide the side wing panels toward each other. When the unit is resting upon a window sill or the lower edge of an opening, the springs 89 will force the side'wing panels away from each other until the anges 99 engage the sides of the openingfthusproviding means for blocking the opening eXceptAfor-the passage provided through the fan unit. andthe opening d.

The shape of the outer shell 21 is substantially that of a spherical Zone, the greatest chord of the zone being of lesser length .thanthe diameter of the openingll. The .pivot meansliealong a chord of the cowl closely adjacent the larger. end ofthe cowl and the. pin 6`lfiassociatedwithi the 6. slot r68Y holds the surface Yof the cowlV iti-spaced` relationl to" the edge of the opening 4iso that -all portions, of the fan-unit may pass i through the opening A57-to various angular positions as illustrated in Figs. 8-to 1 1, inclusive. In these-figures the housing IUis shown inits-position-of use upon a 4window sill 99 with the-keyhole slotsV 91v inthe side wing flanges engaging screws |90 -irrtheinner surface of the window frame.

OperationV In Fig. 8 theunitis shown. in. operation as La Ventilatingy unit bringing fresh air fromftheex-l terior and projecting it. horizontally across. the room, in thiscase the lower window beingr raised to the upper edge of the housing Ill so as .to obtain the greatest possible amount of fresh air.

In Fig. 9 the fan unit has been reversed within the housing by swinging it about the pivot means so that the unit is operating as an exhaust unit to discharge the greatest amountV of air possible from the interior of the room through the openl window. It willbe appreciated that the unit may be so located with respect to the house that cool air may be drawn from the basement up to the top bedroom floors so as to cool the interior of the whole house, or that a single room may be ventilated by the exhaust of stale air through the open window.

In Fig. 10 the unit is illustrated in the position in which it would be placed in order to recirculate a large proportion of the air inthe roomiwhile adding thereto a smaller percentage of fresh air drawn inwardly through the crack between the partially lowered inner window and the bottom of the window sill, this being a preferred position of usage when the room is occupied by sleeping persons in thewinter. When so positioned a stream of mixed recirculated and fresh air is directed toward the ceiling to become tempered byadmixture with the Warmer air near the ceiling before circulating down through the Zone of occupancy. Thus strong drafts are avoided and the sleepers are contacted only by gently moving currents of warmed air to which is constantly being added a percentage of fresh air. Itv will be noted in this diagram that the axis of the fan unit has been tilted substantially 60 degreesy from the horizontal, which is aboutthe limit to which theA fan could be tilted without interferingwith the panes of the lower window unless the depth of housing I0 were increased beyond reason. If tilted upwardly to a slightly lesser extent, the window could be raised and lowered completely Without interference from the cowl or the funnel. In this position recirculated air is drawn upwardly into the outerportions of the cowl and funnel and fresh air is drawn into the intermediate and inner portions thereof, the two streams of air being mixed by the beating action of the fan blades before being projected into the room.

In Fig. 11 the fanunit is illustrated when arranged for the introduction of some fresh air to be mixed with recirculated room air as, for eX ample, during the summer when it is desirableto introduce fresh air. to replace the air which has been devitalized by human use, but it is not desirable to introduce the full volume of air possible. The inner window is illustrated as `being fully lraised but, of course, it may be moved downward to any positionsuch as that illustratedy in Fig. 10 in order to limit the volume of rvfresh air admitted. This, arrangement might bepref erred during the 4summer;` particularlyin fair" condi;

tioned enclosures, since the fresh air is directed into the cooler air near the oor.

Regardless of the position to which the fan unit is adjusted, the tension of springs 6l holds the unit in the desired position. The pin 61, while permitting angular displacement from a limit such as illustrated in Fig. 8 through more than 180 degrees to a limit such as illustrated in Fig. 10, prevents complete rotation of the unit and twisting of the cable 'l0 beyond the breaking point.

Having illustrated and described preferred embodiments of the invention, it should be apparent to those skilled in the art that the invention permits of modication in arrangement and detail. I claim as my invention all such modifications as come within the true spirit and scope of the appended claims.

I claim:

1. A window Ventilating unit comprising a casing adapted to be mounted in a window frame and including a front wall having a circular opening therethrough, a fan assembly mounted in said casing, said fan assembly including an annular cowl including an outwardly convex outer shell and an outwardly concave inner shell, each of large diameter at the inlet end of the cowl and smaller diameter at the outlet end of the cowl, said shells being connected together at their large and small ends respectively, said cowl having a maximum external diameter slightly less than the diameter of said opening, and pivot means mounted on said front wall closely adjacent the inner surface of said front wall and supporting said cowl in said casing, the axes of said pivot means lying along a maximum diameter of said cowl and in a horizontal plane through the diameter of said opening whereby said fan assembly projects through said opening, all portions of said fan assembly lying within a distance from the center of said opening equal to the maximum radius of the cowl whereby said fan assembly may be pivoted about to propel air in opposite directions through said opening.

2. A window Ventilating unit comprising a casing adapted to be mounted in a window frame and including a front wall having a circular opening therethrough, a fan assembly mounted in said casing, said fan assembly including an annular cowl including an outwardly convex outer shell and an outwardly concave inner shell, each of large diameter at the inlet end of the cowl and smaller diameter at the outlet end of the cowl, said shells being connected together at their large and small ends respectively, said cowl having a maximum external diameter slightly less than that of said opening, pivot means mounted on said front wall closely adjacent the inner surface of said front wall and supporting said cowl in said casing, the axes of said pivot means lying along a maximum diameter of said cowl and in a horizontal plane through the diameter of said opening whereby said fan assembly projects through said opening, all portions of said fan assembly lying within a distance from the center of said opening equal to the maximum radius of the cowl whereby said fan assembly may be pivoted about to propel air in opposite directions through said opening, said pivot means including a pair of trunnions and a pair of bearing assemblies pivotally supporting said trunnions, and friction means resisting relative rotation of said trunnions and bearing assemblies whereby said fan assembly may be retained in various positions.

3. A window Ventilating unit comprising a casing adapted to be mounted in a window frame and including a front wall having a circular opening therethrough, a fan assembly mounted in said casing, said fan assembly including an annular cowl including an outwardly convex outer shell and an outwardly concave inner shell, each of large diameter at the inlet end of the cowl and smaller diameter at the outlet end of the cowl, said shells being connected together at their large and small ends respectively, said cowl having a maximum external diameter slightly less than the diameter of said opening, pivot means mounted on said front wall closely adjacent the inner surface of said front wall and supporting said cowl in said casing, the axes of said pivot means lying along a maximum diameter of said cowl and in a horizontal plane through the diameter of said opening whereby said cowl projects through said opening, all portions of said fan assembly lying within a distance from the center of said opening equal to the maximum radius of the cowl whereby said fan assembly may be pivoted about to propel air in opposite directions through said opening, said casing including means dening an enclosure of considerable depth behind said front wall and means dening an air inlet at the rear thereof, and mounting means at the rear of said enclosure adapted to engage opposed, vertical portions of a window frame whereby said casing may be mounted closely adjacent a window, said fan assembly being of such dimensions with respect to said casing that it may be swung through a substantial arc without projecting into the plane of the window.

4. A window Ventilating unit comprising a casing adapted to be mounted in a window frame and including a front wall having a circular opening therethrough, a fan assembly mounted in said casing, said fan assembly including an annular cowl including an outwardly convex outer shell and an outwardly concave inner shell, each of large diameter at the inlet end of the cowl and smaller diameter at the outlet end of the cowl, said shells being connected together at their large and small ends respectively, said cowl having a maximum external diameter slightly less than that of said opening, pivot means mounted on said front wall closely adjacent the inner surface of said front wall and supporting said cowl in said casing, the axes of said pivot means lying along a maximum diameter of said cowl and all portions of said fan assembly lying within a distance from the center of said opening equal to the maximum radius of the cowl whereby said fan assembly may be pivoted about said axis to propel air in opposite directions through said opening, said fan assembly including a funnel located coaxially with respect to said cowl and having its smaller end extending partially into said cowl, a motor located coaxially within said funnel and including a shaft extending coaxially forward into said cowl, an impeller mounted on said shaft and including a plurality of blades extending radially in front of the smaller end of said funnel to within a short distance of said cowl, and a plurality of radially extending, elongated members of relatively small width spanning the spaces between said motor and funnel and between said funnel and cowl to provide a rear guard for said blades, said elongated members including a plurality of radially extending arms connected at their ends to said motor and to said cowl with intermediate portions thereof supporting said funnel, and a plurality of radially extending rods mounted at intermediate points thereof on the forward edge of said funnel and having their end portions extending freely across the spaces between 4said cowl and funnel and between said funnel' and motor.

5. Awindow 'Ventilating fan comprising a casopposite sides of said circular opening, each of saidbraces extending 'from the'lower rear portion of said casing to said front wall 'of isaid casing above the horizontal center line of said circular opening, that portion of each of said braces' ad- 'jacent to said front wall including an arcuate bearing portion facing away from said front wall, a fan assembly including a pair of trunnions extending horizontallyA on opposite sides thereof, said trunnions pairing with said arcuate bearings of said braces, respectively, a limit member on at least one of said ktrunnions extending radially thereof, a pair of straps, each of said straps including Van arcuate bearing portion adapted to bear against a different one of said trunnions, means positioning said straps substantially opposite said rst mentioned Abearing portions, respectively, the one of said straps engaging the trunnion having a limit 'member thereon having a slot therein through which said limit member displaces yupon turning said fan assembly, and means for spring tensioning said straps against said trunnions, respectively.

6. vIn a window Ventilating fan includinga motor and an air impeller driven by said motor, means for rotatably mounting said motor for selectively reversing the direction in which air is displaced, said means comprising: a pair of trunnions extending substantially horizontally from opposite sides of said motor, pivot means for one of said trunnions, a fixed bracket plate including an arcuate bearing having two axial edges and a bearing portion therebetween adapted to bear against less than 180 degrees of the other of said trunnions, a stop pin projecting substantially radially from said other trunnion and positioned for engagement with the two axial edges of said bearing, said other trunnion being turnable between the two positions determined by alternative contact of said stop pin with said two axial edges, two threaded studs extending from said bracket plate on opposite sides of said arcuate bearing surface, a strap having a pair of holes therethrough spaced for engagement with said threaded studs, said strap also including an arcuate bearing adapted to bear against said other trunnion opposite said first-mentioned bearing, said last-mentioned bearing having a slot therein through which said stop pin moves upon rotation of said other trunnion, two nuts, each of said nuts on a different one of said studs, two helical springs, each of said springs mounted on and concentric with a different one of said studs, and two washers, each of said washers on a different one of said studs interposed between said nut and said spring on said one stud, said springs being constrained between said strap and said washers, respectively.

7. In a window Ventilating fan including a motor and an air impeller driven by said motor, means for reversing the direction in which air is displaced, said means comprising: a pair of trunnions extending from opposite sides of said motor, pivot means for one of said trunnions, ya fixed bracket plate including a bearing having two axial edges and a bearing portion therebetween adapted to support the other of said trunnion-s through less than 180 degrees, a stop member projecting substantially radially from said other trunnion and positioned for engagement with the twoV axial edges of said bearing, said motorv being fturnablebetween the two positions determined by alternative contact of said stop member with'said two axial edges, a strap including a'bearing adapted to contact said other trunnion opposite Ysaid first-mentioned bearing, .said last-mentionedbearing having a slot therein positioned to provide clearance for said stop member as said Aother trunnion turns `between said two positions, means supporting said strap for movement toward and away from said other trunnion, and spring means operatively connected to said strap and urging said strap 'toward said other trunnion, whereby'said other trunnion is frictionally `clamped between said bearings.

8. A window Ventilating unit comprising a supporting structure adapted to be placed in and substantially close 'a'window or other suitable opening inawall of a room, said structure 'having a vertical wall, said wall having a relatively large, circular opening therethrough, a pair of pivot means mounted onsaid wall at opposite sides of said opening, said pivot means defining a pivotal axis lying ina horizontal plane'including the horizontal diameter of' said opening and beingclosely adjacent to and parallel to the horizontal diameter of said opening, a cowl pivotally supported by said pivot means, said cowl comprising an annular outer member having a large open end and a small open end, said annular outer member being inwardly concave, the large end of said annular outer member being slightly smaller than the opening through said wall and said pivot means being attached to said cowl at opposite ends of a diameter thereof closely adjacent the large end whereby said cowl is pivotally supported for rotation about said pivotal axis, a motor concentrically mounted within said cowl adjacent the large end thereof, said motor including a shaft projecting toward the small end of said cowl, and a propeller xed to said shaft, said propeller being adjacent the small end of said cowl and being adapted to draw air into the large end of said cowl and discharge the air through the small end thereof.

9. A window Ventilating unit comprising a supporting structure adapted to be placed in and substantially close a window or other suitable opening in a wall of a room, said structure having a vertical wall, said wall having a relatively large, circular opening therethrough, a pair of pivot means mounted on said wall at opposite sides of said opening, said pivot means defining a pivotal axis lying in a horizontal plane including the horizontal diameter of said opening and being closely adjacent to and parallel to the horizontal diameter of said opening, a cowl pivotally supported by said pivot means, said cowl comprising an annular outer member having a large open end and a small open end, said annular outer member being inwardly concave, the large end of said annular outer member being slightly smaller than the opening through said wall and said pivot means being attached to said cowl at opposite ends of a diameter thereof closely adjacent the large end whereby said cowl is pivotally supported for rotation about said pivotal axis, a motor concentrically mounted within said cowl adjacent the large end thereof, said motor including a shaft projecting toward the small end of said cowl, a propeller fixed to said shaft, said propeller being adjacent the small end of said cowl and being adapted to draw air into the large end of said cowl and discharge the air through the small end thereof, said cowl being rotatable about said pivotal axis through an arc of at least 180 degrees from one position at which its axis is substantially horizontal and the small end thereof projects into the room from said wall to an opposite position at which its axis is substantially horizontal and the small end thereof projects outwardly from said wall, and friction means associated with said pivot means and resisting rotation of said cowl about said pivotal axis whereby said cowl will remain at either of the above-defined positions or in any selected intermediate position.

10. A Ventilating unit comprising a substantially rectangular supporting structure including adjustable means whereby the supporting structure may be slipped into a window opening or the like and adjusted to t said opening, said structure including a vertical wall having a circular opening therethrough, and a fan unit pivotally mounted on said wall for pivotal movement about a horizontal axis closely adjacent the horizontal diameter of said opening, said fan unit including a hollow, streamlined cowl having an inwardly concave outer surface and an inwardly convex inner surface, said cowl being in the shape of a ring having a uniform aerofoil cross-section and having one end larger than the other, the larger end of said ring being relatively sharp and the smaller end of said ring being relatively blunt, said larger end being slightly smaller than said opening and said fan unit being pivotally sup- 12 ported along a diameter of said cowl near the larger end thereof whereby said fan unit may swing about through said opening, a motor concentrically mounted within said cowl, a propeller xed to said motor and rotating about the axis of said cowl, said propeller lying adjacent the smaller end of said cowl and being rotatable in a direction to draw air through said cowl from the larger end and project the same through the smaller end, and said cowl being movable about its pivotal axis through at least degrees whereby the propeller may exhaust air from the room or supply air to the room.

OTTIS A. SUTTON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,011,799 Inglis Dec. 12, 1911 1,769,922 Harris July 8, 1930 2,123,448 Weber July 12, 1938 2,153,576 Kurth et al Apr. 11, 1939 2,203,491 Euwer June 4, 1940 2,285,161 Jenn June 2, 1942 2,330,907 Odor et al Oct. 5, 1943 2,378,012 Herbster June 12, 1945 2,418,760 Cucci Apr. 8, 1947

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