US2337325A

US2337325A - Air circulating device

Info

Publication number: US2337325A
Application number: US373990A
Authority: US
Inventors: Edward C Hach; Hersperger Herman
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1941-01-10
Filing date: 1941-01-10
Publication date: 1943-12-21
Anticipated expiration: 1960-12-21

Description

Dec. 21, 1943.- c, c AL 2,337,325

AIR 0 IRCULATING DEVICE Filed Jan. 10, 1941 6 Sheets-Sheet l ATTORNEY Dec. 21, 1943.

E. C. HACH EIAL AIR CIRCULATING DEVICE Filed Jan. 10, 1941 6 Sheets-Sheet 2 Dec. 21, 1943. E. c. HACH ETAL AIR CIRCULATING DEVICE 6 Sheeis-Sheet 3 Filed Jan. 10, 1941 ATTORNEY 4M ATTORNEY SheetsSheet 4 BY a:

E. C'. HACH EI'AL AIR CIRCULA'IING DEVICE Filed Jan. 10, 1941 w W WN Dec, 21, 1943.

Dec. 21, 1943. E. c. HACH ETAL I 3 5 I AIR cmcumwme DEVICE Filed Jan. 10, 1941 s Sheets-Sheet 5 INVENTORS [an/420 C #40:

ATTORNEY Dec. 21, 1943 E. c. HACH ETAL' AIR CIRCULATING DEVICE 6 Sheets-Sheet 6 Filed Jan. 10, 1941 ATTORNEY Patented Dec. 21, f

Edward 0. Each, Westfleld, and Herman Hersperger, Roselle, N. J., assignors to General Electric Company, a corporation of New York Application January 10, 1941. Serial No. 373,990 8 Claims. (01. 98-94) This invention relates to air circulating devices, and has for a general object to provide a device of this character which is of improved construction and arrangement of parts.

The invention consists in the novel construction and combination of parts, to be more fully described hereinafter, and the novelty of which will be particularly pointed out and distinctly claimed. K

In the accompanying drawings, to be taken as a part of this specification, we have fully and clearly illustrated a preferred embodiment of our invention, in which drawings- Fig. 1 is a perspective view illustrating our improved air circulating device as installed within a window opening;

Fig. 2 is an enlarged horizontal sectional view of the device illustrated in Fig. 1, the section being taken on the line 2-2 of Fig. 1;

Fig.- 3 is a vertical. sectional view of the device on a still further enlarged scale, the view being taken on the line 3-3 of Fig. 2;

Fig. 3 is a fragmentary horizontal section taken on the line 3 3 of Fig. 3;

Fig. 4 is a vertical sectional view similar to Fig. 3 and taken on the line 44-of Fig.2, and showing the motor blower unit as adjusted to discharge room air to the outside atmosphere;

Fig. 5 is a vertical longitudinal section of our improved air circulating device, the section being taken on the line 5- 5 of Fig. 3, and being on the same scale as Fig. 2, the intermediate portions of the device having been omitted so as to illustrate more clearly the detail structure at the op- I posite ends of the device;

Fig. 6 is a fragmentary transverse vertical section taken on the line 66 of Fig. 2, and

Fig. 11 is a detailperspective view of the rotatably adjustable damper;

Fig. 12 is an exploded view illustrating the various component parts of the damper shown in Fig. 11;

Figs. 13, 14, 15 and 16 are diagrammatic views illustrating the different positions of adjustment of the rotatable motor blower unit and the rotatable damper to secure the different operating illustrating the manner in which the blower housings are rigidly connected to the ends 'of the motor shaft;

Fig. '7 is'a fragmentary transverse vertical section .taken on the line 'l 1 of Fig.5;

Fig. 8 is an enlarged transverse section taken on the line.88 of Fig. 3, and illustrating the manner in. which the bars forming .the supply grille may be adjusted to direct air in diiferent' desired directions;

Fig. 9 is an exploded perspective view illustrating the two principal component parts of the air circulating device and 'how they may be readily attached and detached'from one another;

Fig. 10 is a detail perspective view showing the rotatable motor blower assembly which is one offthe principalelements of our improved device;

functions possible with our improved device; and

Fig. 1'7 is a fragmentary transverse section taken on the same plane as Fig. 3 and illustrating the manner in which certain of the parts may be ,removed and the remaining parts adjusted so as to provide a different type of window installation than is shown in the other views.

Referring now, in detail, to the construction illustrated, the reference numeral Ill indicates our improved ventilating device in its entirety. The particular embodiment which we have elected to show is adapted to be mounted in close proximity 'to a window opening of a room space,

. andis operable to introduce air into the roomspace from the exterior atmosphere, and is also operable to exhaust air from the room space to the exterior atmosphere. The device is also operable to discharge into the. room space air withdrawn from the room space along with the air from the outside atmosphere, and the device may be adjusted to vary the proportions of room air and outside air introduced into the room space.

In Figs. land 3 we have shown a typical installation of our .device in a double-hung window.

The device It) is shownas being supported by.

the window-sill II, and centrally located in the windowopening between the window jambs l2 andl3. The lower sash rail M of the window has a detachable/ sealing engagement with the top of the device l0, and filler panels or blocks l5 serve to close the space between the ends of the device I 0 and the window jambs. The filler blocks '15 are rigidly secured-in position with respect to the ends of the device Ifl the window sill II and the jambs IZ'and I3. but have a detacliable sealing engagement with the lower sash rail M of thewindow similar to that between the sash rail M and the top of the device l0.

The'ventilating device is shown in Fig. 9 as I being divided generally into two main parts, one of which may be termed a rear housing unit, indicated at I! and adapted to be permanently installed within a window opening, and the other of which may be termed a front casing assembly or unit, indicated at l8, which is detachably secured to .the rear housing unit by means of hooks [6 at the ends thereof adapted to fit within slots 20 in inwardly turned vertical flanges 2| formed on the front of the housing unit l1, and by screws 22 at the top of the flanges 2| fitting within threaded openings 23 provided at the top and ends of the removable unit l8. The removable unit l6 contains all of the operating parts of the unit l6 and is constructed in this manner so that it may be removed and taken to a service shop for repair oradjustment without inconveniencing the customer and without affecting the permanent installation of the rear housing part I! in the window. Furthermore, this arrangement makes possible the standardization of the construction of the removable unit l6 and to vary the construction of the rear housing unit ll to suit the particular requirements of any installation.

'In the construction shown, the rear housing unit comprises bottom wall 25, end walls 26, which are permanently connected together either by welding or being formed of one piece of metal. The unit II also comprises a rear louvre assembly 21 fitting between the end walls 26 and the bottom wall 25 at the rear thereof, and secured 32 which may be insertedor removed, when de-" sired, by a vertical sliding movement within the channels, as will be readily appreciated.

The unit I! also comprises a rear top cover 34, which is connected at its rear by hinges 35 to the top of the louvre assembly 21. One part 36 of each of the hinges 35 is spot-welded to a vertical flange 31 carried by the louvre assembly, and the other part 36 of the hinge 35 is spotwelded to a plate member 39 extending transversely across the rear of the unit ll. The cover 34 is provided at its rear edge with a Z-bar 40, one fiange 4| of which is spot-welded to the cover and another flange 42 extends forwardly'and is provided wtih screw threaded opening which receives attaching'screws 43 serving to rigidly connect the rear of the cover to the plate 39.

' The plate 39 is provided with slots 44 through which the screws 43 extend, and this screw-andslot connection permits forward and rearward adjustment of the top cover withrespect to the remaining portions of the unit ll.

A weathering angle 46 is detachably secured to the forward edge of the top cover: 34 and carries a sealing material, such as felt 41, which is engaged by the lower sash rail l4 of the window and thus provides the detachable sealing engagement between the window and the unit If! previously referred to. The weathering angle 46 comprises two

angle members

48 and 49 with flanges 50 and spot-welded together and with fia'nges 52 and 53 spaced from one another and receiving therebetween the forward edge of the cover 34. The weathering angle 46 is detachably secured in position on the forward edge of the cover 34 by screws 55 extending through aaaasac 6 mounted in a window that the rear is adjacent the plane of the window sash, the weathering angle 46 may be removed and the space between the forward edge of the cover 34 and the removable unit l8 closed by moving the cover forl0 wardly. The connection provided by the screws 43 and slot 44 permits this adjustment of the rear cover. In such an installation, the sealing felt 41a may be attached to the rear parts of the housing unit ll. In Fig. 17 the angle 46 has been removed and the forward adjustment of the cover completed.

As stated previously, the removable front casing assembly I 8 carries' all of the working parts of our improved ventilating device and is '20 detachably secured in position withinv the permanently mounted rear housing ll. The casing unit 18 is provided across its rear part with a first or outdoor air opening 60, across its forward upper part with a second or room air opening 6| and across its forward lower part with a third or room air opening 62. The second and third openings 6i and 62 communicate with the room space, and the first opening 60 communicates through the filter 32 and opening 30 with the outside atmosphere. Within the casing assembly I 8 is rotatably supported a motor blower unit 64 which, as will presently appear is sup-' ported for rotary movement abouta fixed axis extending substantially parallel to the window sash, and which may be rotatably adjusted about its axis of support to either one of two positions, in one of which the unit 64 draws air into the unit I6 through the

rear openings

30 and 60 and room opening 62, and discharges such air from the unit I6 into the room through the opening 6|, and in the other such position the blower unit 64 operates to draw room air through the' opening 6| and discharge such air to the outdoors through the rear openings and 30. When the blower is in the first-named position, a rotatably mounted damper 66in the unit l8 can be adjusted to close off either the rear opening 60 or the room opening 62 and thereby serves as a 'means for proportioning the amounts of outdoor air and recirculated room air introduced into the room through the opening 6|.

The removable front casing assembly 06 may be divided for the purposes of description into a cylindrical casing 10, the motor-driven blower unit 64, and the damper 66. The motor-driven blower unit 64 is shown by itself in Fig. 10, and the damper unit in Figs. 11 and 12. We have not shown the casing!!! separate from the assembly I6, as it is believed to be unnecessary to a clear understanding thereof.

As stated, the casing 10 is cylindrical in form.

' The casing 1'0 when secured in position in the rear housing unit I! is arranged with the axis thereof extending substantially parallel to the plane of the window sash, which axis, as will presently appear, is approximately the same as the rotary axis of support of the motor blower unit 64.

The casing 10 comprises a pair of spaced cylindrical end walls or drums "II and 12, respectively, and a cylindrical side wall composed-of a main front wrapper sheet 13, a lower rear wrapper sheet 14 and an upper rear wrapper sheet 16. The front-wrapper sheet 13 is fixed at its ends by welding to an outwardly extending rim or .flange 16 formed on each of the end drums ll upper and lower members 8I and 82.

and I2. The upper part of the wrapper sheet 18" is cut away and provides the room air opening BI. A strengthening angle 'I'I extends across the casing I0 at the top thereof and is spot-' welded at its ends to the flanges I6 of the drums II and I2. The lower rear wrapper sheet I4 is arranged with its forward edge spaced from the bottom edge of the wrapper sheet I3 to provide the room air opening 62. The wrapper sheet I4 is also rigidly secured at its ends to the drums II and I2 by welding its lateral edges to the flanges I6. The upper rear wrapper sheet I5 is arranged at the rear of the angle 11 and is detachably secured by screws I8 to the rims I8 of the drums II and I2. The space between the rearmost edges of the wrapper sheet I4 and the detachable wrapper sheet I5 provides the rear opening 60. The structural arrangement of the two drums 'II and I2 with the wrapper sheets I3, Id, and I5 and strengthening angle 'I'I. secured at their ends or lateral edges to the drums in the manner just described, effectively provides for the openings 00, 8| and 52, and at the same time provides a strong and rigid casing structure which is relatively simple and inexpensive.

A rectangular supply grille unit is detachably secured within the opening BI. The unit 80 comprises upper and lower longitudinal frame members BI and 82, spaced end frame members' 83 and 84 connecting the ends of the members 8| and 82, and an intermediate frame member 85 connecting "the intermediate portions of the edge of the bottom frame member 82 is suitably bent to form a channel 88 which detachably receives the lower edge of the opening 8|, and the top edge of the upper member 8| is provided with a downwardly extending flange 81 which is adapted to fit alongside the vertical flange 88 of the .stifiening angle I1, and to be detachably secured thereto by suitable screws 89. Extending between the

nd frame members

83 and 84 and the intermediate frame member 85 are two sets of pivoted grille bars 90 and 9|. Each grille bar is provided atits ends with upper pivot pins 92 which flt' within downwardly extending flanges 93 carried by the end and transverse frame mem'-

bers

83, 85 and 85. The grille bars forming each set at each side of the intermediate transverse member are connected together for operation in unison by a link 94 having openings receiving pins 95 extending from the adjacent lower ends of each grille bar .(see Fig. 8). An operating lever 99 is pivotally connected to fulcrum about extensions of pivot pins 92 extending from adjacent ends of two selected bars 90 9 l"- arranged at opposite sides of the intermediate member 95. The lower end of the operating lever 96 is pivotally connected at its sides to extensions of the pins 95 formed on the two selected g'rille bars with an openwork central portion through which III the air flows into the casing I0. The grille member comprises a lower longitudinal frame member I02 offset at I03 to receive the forward edge of the wrapper sheet I4 and extending rearwardly from the forward edge and bent at its rear edge to form a longitudinal channel I04 slidably receiving the rear longitudinal edge of the filter IN. The grille member I00 also comprises an upper or forward frame member I05 to which is The lower 90 and 9H. The lever 96 is provided with an operating handle 91 which extends upwardly from the grille 80. Thus, the grille bars may be readily adjusted to direct the air to different desired portions of the room by rotatably adjusting the handle 91 about the fulcrum axis provided by the pivot pins 92 of the selected grille bars' 90* and 9|. As the grille bars of one set are connected by a link 98 with the grille bar 90 and as the grille bars of the other set are connected by a similar link 94 with the grille bar an, it will be readily appreciated that n of the grille bars are simultaneously adjusted by a movement of the handle 91 about the fulcrum axis 7 spot-welded a. Z-bar I05 extendinglongitudinally of the forward edge and cooperating with a flange I0I of an angle I09 spot-welded to the z-bar, to form a second longitudinally extending channel I09 which slidably receives the upper or forward longitudinal edge of the filter IOI. The upper frame member is detachably secured to the bottom edge of the wrapper sheet I3 by screws I I0. Thus, byloosening the screws IIO the forward or upper edge of the grille member I00 may be low- 'ered and the grille member then removed by moving the same forwardly, which will detach the rear or bottom frame member I03 from the wrapper sheet I6, as will be readily understood. With the grille member I00 removed, the filter IOI may be removed and replaced by simply sliding the same lengthwise along the channels I04 and I09.

Each of the end drums 'II and I2 is formed with a peripheralyannular portion III disposed in a substantially vertical plane, and is formed with a central dished-out hub portion II-2 having an opening in its center. The opening is defined by an outwardly turned, cylindrical flange II3 within which, is secured a bearing H4 receiving a stub shaft II5 for rotatably supporting and adjusting the motor. blower unit 64 and the damper 66, as will presently appear.

In Fig. 10 the motor-driven blower unit 64 is shown in its entirety. The unit 84 comprises a centrally disposed motor II6 having a shaft II1 extending outwardly from both ends thereof, a pair of impellers II8 fixed, respectively, to the outward extensions of the motor shaft III, and a pair of blower housings II9 enclosing, respectively, said impellers, and each housing having at each side thereof an axially disposed air inlet or eye I20, and having a tangential discharge outlet I2I. The discharge outlets .l2I of the two blower housings II9 are similarly disposed, and the two housings connected" together to form a rigid unit by a partition member I23 which, as will later appear, has a sealing connection at its peripheral edges with parts of the casing I0- I when the blower'is adjusted to either of its two positions, and thereby serves to separate the discharge. outlets I2I from the inlets I20.

The motor 6 comprises a casing I25, and the latter is connected at each of its ends to the adjacent, blower housing II9 by means of a spider bracket I26. As shown in Fig. 6, each end of the motor casing I25 is provided with a cylindrical hub I 21 which carries a bearing I28 for. the shaft of the motor. About the outer surfaces of this hub I2'I is secured a rubber ring I29, and to the' outer surfaces of this ring is secured the ,relatively thin metal protecting ring I30. The spider bracket I26 is'formed' in two partg-I3I and I32 secured together by suitable bolts I33. Each part comprises a half hub portion I34 clamped by the bolts I33 about the outer surfaces of the ring and a pair of arms I35 suitably connected by bolts I36 to the side of the'motor housing H9. This construction provides an effective means for supporting the motor from the blower housings, and will also aid the partition I23 in rigidly connecting the housings H9 together to form therewith a single rotatable unit.

It will be appreciated that insofar as the broader aspects of our invention are concerned, the motor H6 need not necessarily be supported from the blower housings H9, for other means for supporting the motor may be devised. For example, the motor may be supported from the bottom of the casing 10 and additional stiffening members provided for connecting the blower housings to assure the required rigidity of the motor blower unit 64-.

To the outer end wall of each housing H9 is bolted a spider I40, which is provided with a central hub portion I4I receiving the stub shaft H extending inwardly from the adjacent end drum 1! or 12, Thus, the two stubshafts H5 carried in bearings H4 in the two end drums 1I and 12form a means by which the entire motor blower unit 64 may be rotatably adjusted about a fixed central axis.

The partition member I23 is shown as bein advantageously formed .from a single piece of sheet metal, and is bent to form awall I43 having openings I44 registering, respectively, with the discharge openings I2I of the blower housings H9, end walls I45 arranged at opposite ends of the wall I43, an upstanding air-directing wall I46 at the rear of the wall I43, and a rearwardly extending wall I41. The partition member I23 is rigidly-connected to each of the blower housings H9 by means of suitable screws I46 and by means-of spaced'brackets I49 spot-welded at their upper ends to an inwardly-turned rear flange I50 of the wall I41, and provided at their lower ends, respectively, with feet I5I suitably secured-to the housings I I9 by screws As stated, a detachable sealing connection is provided between the forward and rear longitudinal edges of the partition member I23 and the casing 10, and between the two lateral edges of the partition I23 and the casing 10, so that there will be no short-circuiting of air from the discharge outlets I2I of the fan housings to the air inlets I20 when the motor blower unit 64 is in either its position to discharge air through the opening 6I into the room, as shown in Fig.

' 3, or in its position to discharge room air to the outdoors through the

rear openings

60 and 30, as shown in 'Fig. 4. The casing is provided at the forward and lower longitudinal edge of the discharge opening. 6| with an angle member I55 which is suitably spot-welded to the wrapper sheet 13, and is provided with an internally extending flange I56 to which is secured a suitable sealing material I51, such as a strip of felt, As shown in Fig. 3, when the unit 64 is in position to discharge through the opening 6|, a downwardly turned, forward edge I58- of the partition I23 has a sealing engagement with the strip of felt I51. The detachable wrapper sheet is provided at its rear edge with an outwardly extending flange I60, to which is -clampeda longitudinally extending strip I6I of flexible sealing material, such, for example, as

rubber. The strip extends inwardly, as shown in Fig. 3, and engages the longitudinal rear edge of the partition member I23, and thereby provides an air seal therebetween at the same time the forward edge I58 of the partition engages the strip of felt I51.

In Fig. 4, when the blower unit 64 is in posi- I tion to discharge room air to the outdoors, the

v not bypass the forward and rearward longitudinal edges of the partition member I23 when the blower unit 64 is also in position to discharge room air to the outdoors.

In order to prevent the bypassing of air from the discharge openings I2I to the inlets I20 around the lateral edges of the partition I23, a strip of suitable sealing material I 65, such as felt, is clamped to each lateral edge of the partition member I23, and these sealing strips are in continuous engagement with the inner faces of the annular peripheral portions I II of the end drums 1| and 12 (see Figs. 2 and 5).

The bending of the partition to form the downwardly extending forward edgel 58 and to provide the upwardly extending air-directing wall I46,

and the inwardly extending rear edge I 50 serves to secure the additional desired function of stiffening the blower unit 64 and thereby resisting any torsional strains placed thereon while moving the same to the two different positions of adjustment previously referred to. In addition to performing this function, the partition member. I23 also serves as a conduit means for conmeeting the two'discharge outlets of the blower with either the room opening 6| or the outdoor air opening 60. This conduit is, in effect, an outward extension of the discharge outlets I2l.

.The end walls I45 and the air-directing wall I46 admirably serve to direct the air through the opening 6I with the minimum of loss dueto eddy currents. In order to further promote the efficient movement of air from the blower through the opening 6|, we also provide a plurality of splitter-vanes I 61 in each of the openings I 2| which may be conveniently adjusted by bending to efficiently distribute the air from the, two blower outlets across the width of the single outlet 6I. The splitter-vanes I61 of each discharge outlet I2I are mounted in a frame member I68 which is suitably secured to the wall I43 of the partition by the screws I48.

In Figs. 11 and 12 we have shown the detail construction of the damper 66. In general, the damper comprises an arcuate-shaped damper element I10 with sealing feltstrips I1I suitably clamped to the two lateral edges thereof, and a pair of supporting brackets I12 fixed, respectively, to the opposite ends thereof. The inner ends of the brackets I12 are formed with axially alined openings I13 therethrough which receive the inner ends of the stub shafts H5 carried by the end drums H and 12 (see also Figs. 2 and 5). The felt strips I1I along the lateral edges of the damper are also in continuous sealing engagement with the inner vertical faces on the annular peripheral portions III of the end drums, and thereby effectively prevent the bypass of air around the ends of the damper.

In Fig. 12 it is noted that the damper element I18 comprises two arcuate-shaped sheets I14 andv axis of support by means of manually operablelever arms I11 and I18, respectively. The arms I11 and I18 are keyed, respectively, to outer extensions of stub shafts H and the arms extend radially outward from their respective stub shafts and are provided at their outer extremities with knobs I19 which are adapted to begrasped by hand for the purpose of moving the lever arms and their respective stub shafts about the central supporting axis. One of the lever arms when rotated, may serve to rotatably adjust the motor blower unit 64 and the other of the lever arms adjust the damper 66. This is effected in the construction shown simply by keying the spider I48 at the left-hand end of the blower unit, as viewed in Fig. 2, to its stub shaft H5, and by keying to the stub shaft H5 at the other end of the casing 18, the right-hand damper supporting bracket I12. Thus, in the construction shown, the lever arm I11 can be moved by hand to rotatably adjust the motor blower unit 64, and the lever arm I18 can be moved manually to adjust the position of the damper 66.

At each end of the casing 18 is provided an end cover I88 (see Figs. 2, 5, and '1). Each cover is secured to its end of the casing by spot-welding an in-turned peripheral flange I8I thereof to the rim flange 16 of its respective end drum H or 12. A pair of suitable moulding strips I82 are secured, respectively, to the ends of the casing 18 and they serve to cover the joints between the inner edges of each flange and the adjacent lateral edge of the wrapper sheet 13. The moulding strips are provided, respectively, with slots I83 through which the outer ends of their respective operating levers extend.

In Fig. 7, we have shown the lever arm I11 as being so constructed that it will remain in any desired position of adjustment. The arm I18 is similar in construction. The outer end of the arm I11 is shown as being provided with a pair of spaced laterally extending flanges I84 and I85, respectively. .The flanges have alined openings through which extend a pin I86 to the outer end of which the knob I19 is secured. The pin I86 also extends through an opening in a friction plate I81 arranged between the knob I19 and the moulding strip I82. A coil spring I88 surrounds the pin I86 and abuts at its outer end the flange I84, and is fixed at its inner end by cotter-pin I89 to the pin I86. It will thus be seen that the spring I88 serves to move the pin and plate I81 inwardly and effect a frictional engagement between the inner surface of the plate I81 and the moulding strip I82. The friction between the surfaces may be readily relieved by pulling the knob I18 outwardly before adjusting the position of the lever arm I11.

One of the features of our improved ventilating device is that whenever the motor blower unit.

64 is adjusted to exhaust room air to the outdoors, the outdoor air opening 68 will always be wide open This is made possible by the fact that the path of movement of the damper 66 is approximately the same as that of the motor blower unit 64. Each time the motor blower unit is rotated to the position to exhaust room air, the rear longitudinal edge I58 of the partition I23 will engage the flexible strip I 64 of the damper and will move the damper therewith to a position where the opening 68 is wide open; provided, of. course, that the damper hadbeen previously adjusted to a position partially or completely closing such opening 68. Fig; 4 shows the position of the parts when the motor blower unit 64 is adjusted to exhaust air to the outdoors. In this position the forward longitudinal edge I88 of the damper 66 is in sealing engagement with a felt strip I9I carried by a flange I92. of an angle member I96 which is spot-welded to the inner lower part ofv the wrapper sheet 13. able air-sealing engagement between the forward This provides a detachlongitudinal edge of the damper 66 and the casing 18. In order to prevent bypass of outdoor air into the room through opening 62 and to assure the correct proportioning of room and outdoor air entering the unit 64, an inwardly extending flexible sealing strip I95 has a continual air-sealing engagement with the bottom of the damper 66. Thestrip I95 is clamped to the rear longitudina edge of the wrapper sheet 14.

From the above description it will be apparent that we have provided an improved form of ventilating apparatus which will effectively perform the advantageous functions of admitting to the room any desired quantities of fresh and room air and which can be readily adjusted to exhaust varying quantities of room airfrom the'room.

In Figs. 13, 14, 15, and 16, we have shown the various positions of adjustment which may be made with our unit'I8 to secure the several described operating functions. In Fig. 13 the motor blower unit 64 is shown as being adjusted .to discharge air directly through the room opening 6|. The damper 66 'is shown as closing completely the opening- 68. Therefore, all of the air entering the blower is recirculated room air through the opening 62. In Fig. 14 the motor blower unit 64 is in the same position of adjustment as in Fig. 13, but the damper has been adjusted to partially cut oil the amount of 'room close the room air opening 62 to open wide the outdoor air opening 68. In this position all of the air entering the room is fresh air through the opening 68. In Fig. 16 the motor blower unit has been rotatably adjusted so that the discharge outlet is now directed to discharge the room air entering through the opening 6| directly to the outdoors through the rear openings 68 and the opening 38.

Those skilled in this art will readily appreciate that our novel air circulating device possesses many advantages made possible by the numerous novel structural features and combinations con.- tained therein. As an example, the motor blower unit 64 and the casing 18 are so constructed that a detachable sealing connection can be had with the casing 18 in either position of adjustment of the unit 64 without restricting in any way the free flow of air to the inlets I28 from the openlugs 68 or 6I.- This is due to the fact that the conduit provided by the partition I23 is an extension of the outlets I21 and is therefore spaced a greater radial distance from the central supporting axis of the unit 64 than those portions of the housingsilii which lie closest to the particular opening 60 or St through which air may be flowing to the inlets I20. Also, because the housings [l9 are scroll-shaped and the discharge outlets l2l tangential, a greater radial distance is required to make the connection with either one of the openings 60 or St than is required to clear the portion of the housings H9 nearest the other of such openings. Thus, a clearance is had between either of

such openings

60 or 6| and the nearest surface of the housings I I9 when the unit 64 is adjusted to discharge through the other of such openings and air may therefore flow freely to such inlets I20 without requiring specially constructed conduits and valves.

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

1. A ventilating device comprising a centrifugal blower including a motor having a shaft extending outwardly from both ends of the motor, a pair of impellers fixed, respectively, to the outward extensions of said shaft, and a pair of housings enclosing said impellers and having axial inlets and similarly disposed peripheral discharge outlets, respectively; means supporting both of said housings for rotary movement about the motor shaft axis; a partition separating the inlets of both said housings from the outlets thereof and joining together said housings to form therewith -a rotatable unit; a casing enclosing said rotatable unit and having a pair of spaced openings therein adapted to communicate, respectively, with separate'atmospheres, and said openings being so arranged with respect to said housings and their rotary supporting means that said unit may be rotatably adjusted about the shaft axis to direct said outlets toward either of said openings; and sealing means cooperating with said partition and said casing to prevent bypass of air between said outlets and said inlets. when said housing unit is in a position to discharge air through either of said openings.

' unit and having a pair of spaced openings adapt- 3. A ventilating device comprising a motordriven centrifugal blower including a motor having a motor casing and a shaft extending outand similarly disposed peripheral discharge outlets, respectively; means supporting said housings for rotary movement about the shaft axis; means joining said motor casing with both of said housings to provide therewith a rotatable unit; a casing enclosing said rotatable unit and having a pair of spaced openings adapted to communicate, respectively, with separate atmospheres, and said openings'being so arranged with respect to said housings and their rotary support that said unit may be rotatably adjusted about the shaft axis to direct said outlets toward either of said openings; and means includ-' ing a partition secured to said housings and extending longitudinally of said casing for providing an air sealing connection between the outlets and said casing when said unit is ad- .iusted to direct said outlets toward either of said openings, said partition being arranged to prevent short-circuiting of air from said outlets to said inlets.

4. A ventilating device comprising a motordriven centrifugalblower including a motor having a shaft extending outwardly from both ends of the motor, a pair of impellers fixed, respectively, to the outward extensions of said shaft, and a pair of housings enclosing said impellers and having axial inlets and similarly disposed peripheral discharge outlets, respectively; a casing enclosing said blower and including a pair of end walls'arranged, respectively, adjacent the outer sides of said housings and transversely of said shaft axis, and sidewalls joining said end walls; means carried by each of said end walls and supporting the housing adjacent thereto for rotary movement about the shaft axis; means joining said housings together for rotation as a unit; said casing. side walls having a pair of openings therein adapted to communicate, respectively, with separate atmosphere and said openings being so arranged with respect to said housingsand their rotary support that said units may be rotatably adjusted to direct said outlets toward either of said openings; arid-means in- 'cluding a partition secured to said housings and extending longitudinally of said casing for providing an air sealing connection between said outlets and said casing when said housing unit is I rotatably adjusted to direct said outlets towar'd ed to communicate, respectively, with, separate atmospheres, and said openings being so arranged with respect to said housings and their rotary supporting means that said discharge outlets may be directed toward either of said openings; conduit means including a partition. extending longitudinally of said housing forfpreventing s'hort-circuiting of air from said outlets to said inlets, said conduit means being movable with said rotatablehousing unit and forming an outward extension of said outlets and connectible with either of said openings so that by rotary adjustment of said unit air may be drawn into said inlets from either of said casing openings and discharged from said outlets and said conduit means through the other of said openings.

. ing a shaft extending outwardly from both ends of the motor, a' pair of impellers fixed, respectively, to the outward extensions of said shaft, and a pair of housings enclosing said impellers and having axial inlets and similarly disposed peripheral discharge outlets, respectively; a casing enclosing said motor-driven blower and in-. cluding a pair of end walls arranged,'respectively, adjacent the outer sides of said housings and transversely of the motor shaft axis, and side walls joining said end walls; supporting means carried by each of said casing end walls and providing 'a rotary support for the adjacent housing which is coaxial'with said shaft;

said casing side walls having a pair of openings therein adapted to communicate with separate atmospheres, respectively, and being so arranged with respect to said housings and their rotary support that said outlets may be directed toward either opening; conduit mean forming an outward extension of said outlets and connectible with either of said opening and including a partition extending longitudinally between and joining together said housings as a rotatable unit so that by rotary adjustment of said unit air may be drawn into said inlets from either of said casing openings and discharged from said outlets and said conduit means through the other of said op nin s- 6. A ventilating device comprising a motordriven centrifugal blower including a motor having a motor casing and a shaft extending outwardly from both ends of the motor, a pair of impellers fixed, respectively, to outward extensions of said shaft, and a pair of housings enclosing said impellers and having axial inlets and similarly disposed peripheral discharge outlets, respectively; a casing enclosing said blower and including a pair of end walls arranged, respectively, adjacent the outer sides of said housings and transversely of said shaft axis, and side walls joining said end walls; means carried by each of said end walls and supporting the housing adjacent thereto for rotary movement about the shaft axis; means joining said motor casing with both of said housings to provide therewith a rotatable unit; said casing side walls having a pair of openings therein adapted to communicate, -respectively, with separate atmospheres and said openings being so arranged with respect to said housings and their rotary support that said unit may be rotatably adjusted to direct said outlets toward either of said openings; a partition separating the inlets of said housings from said outlets and extending between said housings to form a part of said rotatable unit and serving as a stifiening means for said rotatable unit; and means providing an air se a1-' ing connection between said partition and said casing when said unit is adjusted to direct said outlets toward either of said openings.

7. A ventilator for room spaces and comprising a casing having a first opening to communicate with the atmosphere outside of a room space,

and having second and third openings to communicate with the room space; a power-operated blower including a blower housing operable in one position of adjustment to draw outside and room air through said first and third openings, respectively, and to discharg such air into the room space through said second opening and operable in an exhaust position to draw room air through said second room opening and to exblower housing in said exhaust position, for moving said damper from any position restricting or preventing flow of air through said first opening to a position where said first opening is open.

8. A ventilator for room spaces and comprising a casing having a first opening for communication with the atmosphere outside of a room space and having second and third openings for communication with the room space; a power-operated blower in said casing and including a blower housing having an air inlet and a discharge Outlet and being supported for rotary movement about a fixed axis; a damper within said casing supported for rotary movement about approximately the same axis as said blower; said casing openings being so arranged with respect to said blower housing and said damper that, said blower housing may be rotatably adjusted to one position where said outlet is directed toward said second opening and air may entersaid inlet from said first and third openings and may be adjusted to an exhaust position where said outlet is directed toward said first opening and air may enter said inlet through said second opening, and being so arranged that said damper may be moved between two extreme positions closing, respective- W, said first and third openings so as to proportion the amounts of air entering said blower inlet when in said one position; and means movable with said blower housing and engageable with parts of said damper when said blower housing is moved to exhaust position so as to move said damper to the extreme-position closing said third and opening said first opening.

EDWARD C. HACH.

HERMAN HERSPERGER.