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SePt- 17,1946-
Filed Sept. 8, 1944
2 Sheets-Sheet l
FIG. i.
3F 14\
1 i0
. 77 Lat
F's" 3'
'Sept. 17, 1946.
Filed Sept. 8, 1944
2 Sheets-Sheet 2
68. 72
Patented Sept.v 127, 1946
Kyle C. White?eld, Longmeadow, Mass, assignor
to Westinghouse Electric Corporation, East
Pittsburgh, Pa., a corporation of Pennsylvania
Application September 8, 1944, Serial ‘No.“553,177
a 2 Claims.
(Cl. 98-94)
My invention relates to air translating appa
ratus, and more particularly, to an improved
two-fan installation adapted to deliver air to, ex
cabinet are secured to the adjacent ends of the
?ller pieces by any suitable means such as angles
haust air from or recircula-te air in a room or
The ?lter 36 is preferably detachably mounted
in position. As shown, the ?lter is slidable in
channels formed between blocks or the like 48,
other enclosure.
An object of the invention is to produce an im
proved apparatus of the type set forth.
A further object of the invention is to produce
an improved two-fan installation by meansyoi"
Which admission of air into, withdrawal of, air
from, and recirculation of air in, a room may be
effectively directed with reference to different
portions of said room.
A still further object is to provide improved
control means whereby operation of said fans
may be selectively controlled by a single, easily
operated switch.
M and screws 46.
projecting from the inner faces of the side walls
30 of the cabinet, and the juxtaposed portions oi
the angles 44, as clearly shown in Fig. 2.
The front wall 28 is providedon its inner side
with a pad 50 for supporting a control knob 52,
having an index or pointer Stand a dial 56 hav
ing, marked-oil positions 58, for indicating var
ious modes of operation of the fans 20 and 22 in
' conjunction with the control mechanism dia
grammatically shown in Fig. 5,
In order to be able to direct the ?ow of air to,
These and other objects are effected by my in
or from, different portions of the room, the fans
vention as will be apparent from the following
are set at an angle to each other, as shown in
description and claims taken in connection with 20 Figs. 2, 3 and 4. This angular setting of the fans
the accompanying drawings, forming a part of
enables them to deliver outside air to opposite
this application, in which:
portions of the room, as shown by the arrows in
Fig, 1 is a perspective view showing a two-fan
Fig. 2, to exhaust room air from opposite por
installation embodying my invention mounted on
tions of the room, as shown by the arrows in Fig.
the bottom sill of a window;
3, or to recirculate room air in one direction, as
Fig. 2 is a section on line II—-II of Fig. 1, show
shown by the solid‘line arrows in Fig. 4, or to re
ing the fans delivering air to the room;
circulate room air in another direction, as shown
Fig. 3 is a fragmentary view similar to Fig. 2,
by the broken linearrows in Fig. 4.
showing the fans exhausting air from the room;
Fig. 4 is a view similar to Fig. 2, showing the 30 capacitor motors M1 and M2 which are selective
.fans recirculating air in the room; and
ly operated by the control knob 52. The motor
Fig. 5 is a diagrammatic view showing the im
M1 includes a rotor 60, and a ?eld winding formed
proved switch and control circuit for selectively
of two parts 62 and 64 which are connected to an
effecting the various operations of the fans. .
electric lead line L1 by a. wire 66, and to opposite
In the drawings, there is shown a two-fan in
sides of a capacitor 68 by wires 10 and 12. The
stallation embodying my invention and mounted
motor M2 also includes a rotor 14 and a ?eld
on the bottom sill H3 of a conventional‘ window
winding formed of two parts 76 and 78 which are
having side J'ambs l2 provided with grooves l4
connected to the lead line L1 by a wire 80, and to
and It in which are slidably mounted the usual
opposite sides of a capacitor 82 by wires 86 and
window sashes, one of which is shown at IS.
88. As is well known, the direction. of rotation of
The fan installation includes a pair of fans 20
a motor of this type maybe reversed by connect~
and 22 enclosed within an attractive cabinet
ingone part of the ?eld winding or the other in
formed of top and bottom walls 24 and 26, a front
series ‘with the capacitor.
wall 28 and side walls 30. The junctions of the
In order to selectively control the operation
side walls 30 with the front wall 28 are prefer
of either or both of the fans, I provide a'single
ably rollnded and provided with louvered open
control switch which is diagrammatically shown
ings 34. The outer end of the cabinet registers
in Fig. 5 and which includes contact segments
with the window opening and is either entirely
92, 93, 94, 95 and 96 and a switch or contact arm
unobstructed or ?tted with a removable ?lter 36.
98 connected to lead line L2 and adapted to be
The spaces on either side of the cabinet hous 50 rotated by the knob 52 into selective engage
ing the fans are closed by ?ller pieces 33 which
ment with any one or any two of the contact
may be opaque, translucent or transparent. The
segments to energize or deenergize, or to reverse
?ller pieces are secured to the window frame by
the direction of rotation of, either or both of the
any suitable means, such as straps or brackets 40
fans. The switch also includes an “01f” position
and screws 42. Likewise, the Side Walls of the
I88 to which the arm 98 may be moved When it
is desired to shut the power off from both of the
In order to be able to run the motor M1 in
either direction, it is connected by a wire I04 to >
the contact 96 and by a wire I06 to the contact 5
94. Therefore, when the circuit is completed
through contact 96, the current in the winding
64 will be in phase, and the current in the'wind
ing 62, being in series with the capacitor 68,
will be out of phase. The current in the winding
62 will, therefore, “lead” and the motor M1 will
run in one direction, which for this purpose may
the contacts 92 and 93 and in which the
M1 will run forward and motor M2 will run back
ward, as illustrated by the broken line arrows
in Fig. 4.
By the arrangement above described, it is pos
sible to introduce outside air and to direct such
air to either or both of different parts of the
room. It is also possible to Withdraw air from
one or another part of a room, or to withdraw
air from both parts of the room simultaneously.
Air may also be recirculated within the room by
causing one of the fans to withdraw air from,
and the‘ other of the fans to propel air into, the
be termed the forward direction. When the cir
cuit is completed through the contact 94, the re
The ?lter 36 is made readily removable so that
verse condition prevails and the motor will run 15
it may be easily removed, ifdesired, when the
in the oppositev direction or backward. ‘ It will
fans are used for exhausting room air.
be noted that the contacts 92 and. 96 arefbridged
It will be seen that by merely moving the knob
by a wire I08 so that the motor Ml will run for
52 to positions on the dial 58 which are marked
ward whenever the circuit is closed through 'ei
20 with indicia, corresponding to positions A to F,
ther of these contacts.
inclusive, the operator can selectively control the
The motor M2. is connected to the contact 95
operation of the fans to produce any of the ef
by a wire I I9 and to the contact 93 by a wire
fects hereinabove set forth. The fans 29 and 22
H2 so that, if the circuit is completed through
may be ?xedly mounted in the positions shown,
the contact 95, the motor M2 will run in a for
ward direction, and if the circuit is completed 25 or they may be adjustably mounted so as to vary
their angular relationship and the direction of
through the contact 93 the motor will run inthe
movement of the air propelled by either or both
reverse direction, as explained in connection with
of said fans.
motor M1.
While I have shown my invention in but one
form, it will be obvious to those skilled in the art
When it is desired to cause the fan 20, for 80 that it is not so limited, but is susceptible of vari
example,’ to deliver outside air to the room, the
ous changes and modi?cations without depart
motor IV!1 of this fan is energized by moving the
arm 98 from the “off” position to position A in
ing from the spirit thereof.
What I claim is:
,1. In a device for ventilating a room or other
When it is 35 enclosure, a cabinet having a pair of air flow
which it contacts the segment 92 only and in
which the motor will run forward.
desired to cause the. fan 20 to withdraw air from
openings communicating with said room and at
the room, the arm 98 is moved to position B in
least one opening leading from said cabinet to
which it engages the contact“ only. This re
a space outside of said room, a fan mounted for
verses the direction of operation of motor M1.
40 moving air through one of said room openings,
The same result can be obtained with reference
another fan mounted for moving air through
to the fan 22 by moving the switch arm to posi
the other of said room openings, a reversible
tion. A’ or B’ to energize the motor M2 through
motor for each of said fans and a single switch
the contact 95 or 93, respectively.
means movable into one position in which both
When itis desired to cause both of the fans 4 of said fans Withdraw air from said room and
9 to deliver-outside air to the room, as shown in
Fig. 2, the switch arm is moved ,to position C, in
which it engages contacts 96 and 95 which are
connected to the corresponding sides of the mo
tor M1 and M2, so that both of the motors will 50
run. forward. To cause both of the fans to with
draw air from the room, the switch arm is moved
discharge it through said outside opening, into
a second position in which both fans draw air
through said outside opening and discharge it
into said room through said room openings, and
into a third position in which one of said fans
draws room air through one of said room open
ings and the other of said fans propels said air
toposition D, in which it engages contacts 93 v- into the room through the other of said room
and 94 to reverse the. operation of both motors.
When it is desired to recirculate the room air, 55 2. The structure recited in claim 1 in which
it is necessary to have the fans running in op
said room openings are disposed in different
posite directions. To accomplish this, the switch
planes and in which the axis of rotation of each
arm may be movedto position E, in which it en
of said‘fans is substantially normal to the plane
gages contacts 94 and 95 so that the motor M1
of its respective opening, the axes of rotation of
will run backward while motor M2 runs forward. 60 said shafts being at substantially right angles
This condition is illustrated by the solid lines in
to each other.
Fig. 4. To reverse this condition, the switch arm
may be moved to position F, in which it engages
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