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Патент USA US3046879

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July 31, 1962
Filed Sept. 22, 1959
3 Sheets-Sheet 1
July 31, 1962
Filed Sept. 22, 1959
3 Sheets—Sheet 2
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July 31, 1962
Filed Sept. 22, 1959
3 Sheets-Sheet 3
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Patented July 31, 1952
diffuser by the employment of the throw control devices
Harold E. Stranb, Cedar Falls, and Eugene F. Averill,
Waterloo, Iowa, assignors to Titus Manufacturing Cor
poration, Waterloo, Iowa, a corporation of Iowa
Filed Sept. 22, 1959, Ser. No. 841,592
17 Claims. (Cl. 98-40)
of the instant disclosure.
In general, the primary objective of our invention is
the control of the throw of diffusers having substantially
straight-sided de?ector vanes whereby the air stream(s)
discharged thereby are modi?ed, for example, by de
creasing the length of throw of the air stream(s), de?ec
tion of the air stream(s) from obstructions such as col
umns or the like, and/ or discharging the air from straight
This invention, in general, relates to air de?ectors or 10 sided diffusers in ?ow patterns closely similar to the ?ow
diffusers. More, particularly, the invention concerns
patterns of diffusers having ring or circular vanes—the
improvements in the control or regulation of the throw,
‘ latter patterns being ones of substantially uniform ?ow
which is the length ‘of the primary air stream(s) dis
charged laterally by the diffuser or air de?ector, in one
in all directions outwardly from the diffuser.
Other objectives of our invention are: the provision
or more directions and to throw control devices. for pro 15 of throw control devices which can be simply installed
viding said regulation or control.
at the diffuser installation to give various modi?cations
The 1air de?ectors or air diffusers to which the instant
of the normal ?ow pattern of a diffuser in accordance
invention relates are de?ectors or diffusers, herein-after
with particular requirements;rthe provision of throw con
called “diffusers” or “air diffusers” for convenience of
trol devices on diffusers with straight-sided vanes which
description, having essentially straight vanes. These air
decrease the throw(s) and increase the spread or width
di?users in plan view have at least one side and normally
of the discharged air stream(s) modi?ed by our throw
not more than four sides from which the main air stream,
control devices; the ‘provision of throw control devices
supplied to the di?user by ‘a connecting duct or the like,
of simple construction and low cost; and those objectives
is discharged substantially laterally by de?ector vanes
and advantages of our invention which shall be herein
into 1-4 primary air streams-depending on the design of 25 after described or made apparent to those skilled in the
the diffuser. We do not intend to exclude from the scope
of our invention herein disclosed :air di?users having more
Brie?y, the throw control devices of our invention are
than four straight sides and more than four primary dis
pairs, usually a series of pairs, of angularly disposed
charge iair streams, but diffusers having ?ve, six or even
vanes which can be press ?tted or otherwise attached on
more sides and a corresponding number of primary air 30 the rear side of a ‘di?‘user having substantially straight
streams are unusual designs in present practice and design.
sided de?ector vanes. These vane pairs are disposed at
Accordingly, the following description is directed pri
an acute angle, e.g; 30—75°, relative to the axis of the
marily to diffusers providing 1-4 primary air streams.
diffuser. The vanes, of the control devices are positioned
The primary function of air diffusers is the interception
v between adjacent vanes of the diffuser to de?ect laterally
of air discharged from an outlet such as a wall or ceiling
the air which is de?ected also by the vanes of the di?user.
duct, the axis of said duct being substantially 90° relative
The throw control devices ‘may be installed on diffusers
to the wall or ceiling, and the de?ection of the air dis
having substantially straight-sided vanes, usually a series
charged from said outlet outwardly or laterally. Most
of parallel vanm, directed to de?ect the air in only one
commonly, the main stream(s) of the laterally discharged
direction, or in two directions, or in three directions, or
air ?ows close to the wall or ceiling for a substantial dis 4.0 in four directions, etc. In diifusers which direct the air
tance, after which it mixes with the room air. Taking
in a plurality of directions, the throw control devices may
cool air discharged from a ceiling diffuser, the cool air,
be installed on only one series of di?user de?ector vanes;
though heavier than the warmer room ‘air, ?ows out
on each series of de?ector vanes, or on any intermediate
wardly from the diffuser adjacent to the ceiling until its
number of series of de?ector vanes. It is not necessary
velocity is reduced by turbulence, friction, obstructions, 45 to insert de?ector vane pairs of our throw control devices
or the like to a velocity low enough that the cool air
on each di?’user de?ector vane of a ‘given series in order
stream(s) begin to fall from the Zone adjacent the ceiling
to obtain modi?cation of the throw of this series of vanes.
and mix with room air. As the main air strea-m(s) ?ow
' In fact, we prefer, in giving air throw patterns which are
outwardly from the diffuser ‘adjacent the ceiling or wall,
shortened and increased in spread, to use throw control
there is some turbulence at the zone between the main 50 devices with vanes pairs between less than all of the dif
air stream(s) and the adjacent room air—and conse
fuser de?ector vanes of a given series. The effects on
quently, some mixing of cool air and room air beginning
at the time the cool air is discharged from the di?user.
modi?cation of air streams by various placements of the’
vane pairs of air throw control devices are discussed in
The main portion of air stream(s), however, ?ow out~
detail in the following portions of this speci?cation.
wardly from the di?nser adjacent the ceiling until the 55 The generic invention herein disclosed will be further
velocity diminishes sufficiently to allow the heavier cool
explained with reference to speci?c embodiments'of our
air to fall from the ceiling and commingle with the warm
invention, which embodiments are illustrated in the draw
ing, wherein:
FIG. 1 is ‘a bottom plan view of a rectangular lair dif
The measurement of the throw of the main air -stream(s)
is a determination dependent upon the preselection of a 60 fuser with which the throw control devices of the present
disclosure may be used;
?ow velocity value which is used to de?ne the air ?ow
FIG. 2 is a top plan view of the diffuser of FIG. 1
encompassed by each main air stream. Any portion of
a throw control device mounted on one series
the air stream(s) at which measured ?ow velocity is at
of de?ector vanes;
, '
or above the preselected ?ow velocity value is within the
FIG. 3 is a cross-sectional View taken on section ,3-3
area encompassed by the main air stream(s). The pre 65 of FIG. 2;
selected value may be any value such as 50, 100, 150, or
FIG. 4 is a perspective view of a throw control device
200 feet per minute, as well as any other value preselected
and further illustrating the mounting of said device on .
for particular requirements of a given air distribution
a de?ector vane of the di?user, said vane being shown in ‘
system. The main point is that some value is preselected
for a common reference point to determine the effect on 70
' FIG. 5 is a top plan view of the throw control device
control or diminishing of the throw(s) in a given air
of FIG. 4;
FIG. 6 is a diagrammatic illustration of the e?ect of
turned-up edge 24 on vane 4.’ A strip 25 of rubber,
' modi?cation of primary air patterns discharged by a rec
?ber or like resilient material, is glued on the rear face
tangular di?fuser having an equal number of de?ector
of the ?ange 5 next to turned-up edge 24. This strip
vanes on three sides and a larger number of de?ector
vanes on the fourthside-the isovels indicating the out
is in contact with the ceiling or wall 26 when the diffuser
is mounted therein.
line of the primary air patterns in the absence of the throw
control devices and also with the throw control devices
inserted as illustrated and further wherein the right-hand
19, ‘29, 21 and 16, 17, 18 of the de?ector vanes 2, 3 and
4 are held together by corner clips 27 of the same con-V
struction and spot welded 'to the vanes in the same
throw control device has either ?ve or seven de?ector vane
The respective trapezoidal and rectangular segments
10 manner as corner clips 12, previously described. If ad!
ditional bracing between vde?ector vanes is desired,,it may I
’ FIGS. 70,712, and 7c are diagrammatic views of isovel
patterns of a square di?user similar to the embodiment of
1-3 with a throw control device as illustrated in
FIGS. 4 and 5 placed on one series of four de?ector vanes
of the di?user'and utilitizihg a four vane pair throw con 15
mi device (FIG. 7a) or a three vane pair throw control
‘ device in different positions on the series of de?ector vanes
be done by welding the upper edges of segments 8, 115, 16 '
and 17 in spaced slots of a bracer bar or bars extending
across the rear face of the diifuser and welded at each
end to the inner wall of segments '18.
Rectangular segments 18 of the outer. de?ector vane 4
extend above the rectangular segments of the vanes 1, 2
FIG. Sis adiagramrn'atic illustration‘ of isovels from
and 3. These segments 18 'form a vw'alladapted to be
telescoped over a'rectangularttake-oif duct of an air dis
anobl'ong diffuser having de?ector vanes directing the
in two directions and showing isovels in the absence
bf the throw'control devices,v as welltas isovels resulting,
' nated by numeral ‘28, or'over an adapter for a circular
from the positioning of the rightshand devices in positions
ened together by metal screws or the like (not shown).
.of' the diffuser (FIGS. 7b and 7c);
A or B; '
tribution system, shown in phantom in FIG. 3 and desig- ‘ s V
take~o? duct.' The telescoped’ members usually are fast
The embodiment of the'throw control device of FIGS.
FIG. 9 is a diagrammatic illustration of isovels ‘from 25 2—5 'comprises'a series of pairs of diverging vanes 31), 3'1. '
an oblong shaped diffuser having de?ector vanes directing
The vane pairs are separated by cut out portions 33, and
the 'air in two'directions and showing isovels in the absence
tabs 32 are left in the cutout step on the rear side of each
of l the‘throw'control device, as well as isovels with the
throwcontrol device in positions A or B;
‘FIG. 10 is a diagrammatic illustration of isovels from
a square di?user directing the air in two directions and
showing isovels in the absence of the throw control de
vanel These tabs are used to clip by frictional contact
. the throw control device on the upstanding segments 8,
16 and 17 to hold it in position. The tabs 32 are raised
slightly with respect to the vanes 30 and 31. The vane
pairs 30, 31 are connected by narrow necks 34 at the apex
35‘ of the throw control device;
vices, as well as isovels with the two throw control devices
positioned as illustrated;
’ In the embodiment shown, the series of vanes are
, »FIG. 11' is a diagrammatic illustration of a square dif
fuser having vanes directing the air'iu four directions
35 stamped from a piece of sheet metal in any desired num
ber of units, e.g., 12, 18 or 24., The number of vane
pairs, e.g., three as shown in FIGS. 4 and 5, are cut off
' and showing isovels in the absence of the throw‘control
devices, as well as the isovels with four throw control
devices positioned *as illustrated; and
the series of'vanes by cutting at a neck 34, If a frac
tional vane unit is desired at onetend, the cut is made
12 is a'diagrammatic illustration of a rectangular 40 across vanes 30 and 3-1.
di?user having de?ector vanes directing ‘the air in only
one direction and showing the isovel in the absence of
the throw control device, as well as the isovel with the
throw control device positioned as illustrated.
The vanes 30 and 31 have the shape of the two equal“ '
' sides of a triangular base, right angular frusto-pyramid.
' The lower or outer edges 36 of vanes 30- and 311, are"
shapedrelative to apex 35 at anmangle coinciding with
' The rectangular di?user of FIGS. 1-3 ismade up of 45 the angular sloping of the vanes '1, 2 and 3 so. that the’?
' arseries of de?ector vanes 1-4 each- having four de?ecting
.edges 36 rest, or nearly rest, on the upper or rear air
surfaces for directing the air outwardly in four directions
at, right angles to each other. De?ector 'vane 4 has a
peripheral ?ange 5. De?ector vane‘ 1 comprises a pair
of ‘opposed vanes 7 which have upright, rectangular seg
ments 8. The segments 8 are secured togetheras by spot
welding. The vanes 7 have regular trapezoidal'portions
9 which are angularly positioned with respect to segments
de?ecting surfaces of said vanes whenthe throw control
device is'm'ounted in the diffuser.
While the tabs 32 provide a convenient means for
securing the throw control device(s) on the diifuser,
there are many other means wtihin. the scope of our in
vention which could be substituted therefor, such as spring clips, wedges, screws, and the like. _ The tab ‘construction, '
Sand have a return bend or rolled edge 10.
however, is advantageously employed because of the sim- '
_ Thede?ector vane ‘1 further consists of triangular vane 55
plicity of construction of units containing said tabs, the
entire unit beingmade in one stamping step,'as well as
disposed at an angle to the normal axis of the diifuser
because the clipping or clamping means (the tabs) ‘are
similar to the angle of trapezoidal segments 9. _ Varies
a unitary part of the throw control device and not sep
7 and 11 form the innermost de?ector members of the, _ . arate components as in the case of screws, wedges, etc?’
diffuser.’ They are held together by corner clips 12 by 60
When the throw control device is mounted on the
spot-welding of'vanes 9 and 11 near their joining ‘edges
diffuser of FIGS. l-—3 in the manner shown, air supplied
to the bases 13 of clips '12, which bases are peaked to
through duct 28 strikes the rear or upper surface of vanes 1
conform-to‘ the contour of the corners formed by joining
1,2 and 3. It is de?ected outwardly by said’ vanes'andj
plates 11 'with rolled or return band edges (not shown)
edges of vanes 7 and 11. The corner clips have upstand- '
' flows through channels formed between vanes 1 and '2,
ing side wings ‘14 with bent tabs :15 'spot welded to the 65 2 and3, and ,3 and 4.
' ’ inner side of the ‘upright, rectangular segments 16 of
The primary streams of dis
charged air ?ow outwardly in four directions, one on ,
the next adjacent de?ector vane 2 hereinafter described.
each side of’ the diffuser. Three of the four air streams
De?ector vanes 2, ‘3 and 4 are'concentrically mounted
are of substantially'equal magnitude while the-air stream
‘about de?ector vane‘ 1,1 and each vane is spaced from
the fourth side, the left-hand side'in the
the next. adjacent vane to provide air passages’ there 70 case of~the embodiment of ‘FIG.’ 2, is diverted into two
' between.“ De?ector ‘vanes 2, ‘3 and 4 are made up of
partshaving‘upright, rectangular segments‘ 16, 17 and 18,, '
resfepectively, and regular trapezoidal segments 19, 2t} and
21,"respectively, with rolled or return bend lower edges
22 and
on vanes 2v and 3 and marginal ?ange Sjwith
- i
streams with shorter throw and greater'total spread than:
the air stream which is discharged in; the absence of saidv i, ~
The various eifects in regulation or control of the‘
throws of various types of diffusers having straight-sided
vanes obtained with the throw control devices of our in
vention ‘will be understood and appreciated further from
the diagrammatic illustrations of FIGS. 6—l2. The
isovels shown in these ?gures indicate points one inch
below the ceiling at which the primary ‘air velocities are
200 feet per minute. These isovels de?ne the main bodies
of discharged air. They do not mean that the primary air
occupies only the space outlined by the isovel. Actually,
each primary air stream consists ‘of air ?owing outwardly
from diffuser in layers moving at different velocities
the primary air streams being in a much wider arc than
device 49,'the length of throw of the main air stream is
decreased only slightly over the throw in the absence of
the throw control device and the spread is increased some,
what as to the high velocity air.
FIGS. 7a-7c illustrate that most effective reduction
of length of throw attained when the de?ector vane pairs
are mounted in the air channels of the diffuser beginning
with the innermost air channel of a given de?ector vane
series and working outwardly. In most . cases where
reduction of length of throw is desired, we prefer to leave
at least the outermost channel open or at least partly
the illustrated isovels with the ‘air velocity in the illus
trated isovels being greater than 200* feet per minute and
the air velocity outside the isovels being less than 200
open by using only a fractional vane pair for the outer
most channel. As will be noted from FIGS. 6-12, reduc
tions of length of throw and increase in spread can be
feet per minute. All isovels for a given outlet were as 15 achieved by leaving open more than one of the outermost
certained at the same total air ?ow rate.
channels. As a general rule of thumb, the length of throw
FIG. 7 shows, diagrammatically, isovels determined
is decreased by increasing the number de?ector vane
as above-described, with a rectangular ceiling diffuser
pairs, beginning with the innermost channel of a given
having an unbalanced discharge pattern due to a greater
series of de?ector vanes. Note, for example, FIG. 6.
number of vanes on one side of the diftuser. This type 20
FIGS. 8 {and 9 show corner diffusers 50 and 55. These
of di?user is used in rooms whose dimensions relative
diifusers have two de?ector vane series for de?ecting the
to the dilfuser location can best utilize one long throw
air in two directions. They are useful at installations
and three much shorter throws. This 200 f.p.-m. isovel
where bi-directional flow is required, e.g., when a diifuser
without throw control devices is shown in solid lines.
is mounted in a ceiling near or in a corner of a room.
After placement of a throw control device 41 on the left 25 In each case, one de?ector vane series is longer than the
hand series of diffuser vanes and throw devices 42 on
other. These diffusers can be made in a manner like the
the top and bottom series of diffuser vanes, a ?ve vane
di?user of FIGS. 1-3.
pair and then a seven vane pair throw control device 43
was mounted in the ?ve innermost or seven innermost
diffuser channels, respectively. The vane pairs of throw
control device 41 are placed in all but the outermost air
channel of the left-hand deflector vane series while vane
pairs of throw control ‘devices 42 are inserted in all the
air channels of the top and bottom de?ector vane series
the outermost channel having only one-half of a vane
Diffuser 50, with marginal ?ange 51, produces 200
f.p.m. isovels, measured as above-described, shown in
long dash-dot lines of FIG. 8. With throw control device
52 installed in both instances, the air flow pattern of the
diffuser is shown by the solid line isovel A when throw
control device 53 is installed in position A and by the
short dash isovel when throw control device 54 is installed
' in position B (throw control device 53 being removed).
The device 53 in position A gives an isovel pattern A
with ?ngers of unequal length whereas the device 54 in
position B gives an isovel pattern B with ?ngers of ap
dash lines and the seven vane pair isovels in short dash
proximately equal length. The isovel A from throw con
lines. The right-hand ?ve vane pair isovel is signi?cantly 40 trol device 52 is shifted slightly back with ‘control device
shorter than the solid line isovel and has greater spread.
53 in position A as compared with the isovel B.
A still shorter and wider isovel of a length of about
Diffuser 55 of FIG. 9 produces 200 r".p..m. isovels C
0.5-0.6 of the solid line isovel is observed with a maxi
and D of different patterns when throw control device
The 200 f.p.m. isovels were ascertained for each primary
air stream-—the ?ve vane pair isovels shown in dot-long
mum spread or width across the divided primary air
_ 57 is in either position C 'or position D. A slight change
streams slightly more than the maximum width of the
?ve vane pair isovel. A shortening and spreading of the
200 rpm. isovels by throw control devices 41 and 42 are
also observed. The change from a ?ve vane pair throw
in position of device 57 changes the long ?nger of isovel
Cto the short ?nger of isovel D and the long ?nger of
control device to a seven vane pair throw control device
43 gave a small increase in the isovels of the three other
isovel D to the short ?nger ofvisovel C. The isovel of
the diffuser 55 without throw control ‘device 57 is shown
M in long dash-dot lines.
The di?user 58 of FIG. 10 is a corner diiiuser with
throw control devices 41 and 42. This additional throw
from the left-hand, top, and bottom de?ector vane series
illustrates that increasing resistance on one side by adding
more vane pairs forces more air out the other sides. The
?ange of the diffuser is shown at 44.
two equal de?ector vane series. It has a marginal ?ange
59. In this instance, throw control devices 68 and 61
(FIG. 7a), in all but the outermost channel (FIG. 7b),
the air streams are directed.
are placed on the di?user as illustrated to shorten ‘and
_ spread the two primary air streams-—the isovels of which,
55 without the de?ection by vanes of throw control devices
In FIGS. 7a, 7b, and 7c, the diffuser 45, illustrated in
6!} and 61, are shown in solid lines. The primary air
part, ‘with ?ange 46 is a square di?user Similar to the
streams are shortened and spread by tthrow control de
diffuser of FIGS. 1—3. The vane series has four air chan
vices éii and 61 for the purpose of changing the essentially
nels. These'?gures show the e?ect upon a primary air
. bi-directional ?ow shown by the solid line isovels to a
stream by vane pairs inserted in all the air channels 60 more uniform ?ow over the quarter circle into which
and in all but the innermost air channel. The isovels of
A like equalization of flow around the periphery of the
FIGS. 7a-7c are drawn on the ‘same scale and were
diffuser is observed in FIG. 11 wherein the diffuser 62
measured with the same total air ?ow rate through the
with peripheral ?ange 63 is a square di?user which emits
diffuser. When vane pairs are added in all air channels 65
on one side of a diffuser as in throw control device 47,
two distinct air streams ‘are formed. This ‘air pattern is
adopted for channeling most of the main air stream
around obstructions.- Where only the outermost channel
is left open as with throw control device 48, two main
air streams are formed without the distinct void there
between of FIG. 7a. The isovel pattern‘of FIG. 7b is
considered to be the more ideal pattern 'for the stand
point of effectiveness of throw control. With vane pairs
in all but the innermost channel as with throw control
a primary air stream from each side. By inserting throw
control’ ‘devices 64 on each of the four de?ector vane
series, with vane pairs in all inner air passages and .one-'
half vane pairs in the outermost passages, the four-?ngered
isovels shown in solid lines, which are the isovels in
the‘ absence of throw control devices 64, are modi?ed
to the rosette-shaped isovels in short dash lines. These
isovels show that the throw control devices 64 consider
ably improve‘ the uniformity of distribution of the air
streams over the entire ceiling area surrounding the dif
3,046,866 7
fuser, as well as shortening (the throws of the four primary
7. Thedi?user of claim 3 wherein'the diffuser has ex
actiy two series of substantially parallel, ?at-sided de
The diffuser 65 of FIG. 12 with, peripheral ?ange 66
is a uni-directional di?user for ceilings or walls.
?ector vanes and the vanes of one series are at right.
angles with respect to the vanes vof the other series.
throw control device 67, with vane pairs in all but the
two outermost'air passages, considerably shortens and
widens the isovel produced without control device 67',’
shown in a solid line. The isovel of the short dash line
8. The diffuser of claim 3 wherein the di?user has four
series of substantially parallel, ?at-sided de?ector vanes
and said series of vanes are arranged in a rectangular pat
tern whereby a primary airstream is discharged by‘ each '
of the four sides of said diffuser.
9. The diffuser of claim 8 wherein each of the four
indicates that produced by inserting the ‘throw control
device 67 as illustrated.
The foregoing description and the illustrations in the
series of de?ector vanes has the throw controlrdevice of 7
drawings areindicative, though by no means exhaustive,
claim 3 mounted thereon.
of the many modi?cations and changes in diifuser air flow
'10. An air diffuser having a series .of substantially
patterns attainable in uni-directional and multi-directional
parallel, spaced air, de?ector vanes, said vanes having
air di?users by the use of the throw control devices herein 15 spaced, upwardly directed, rear segments and downwardly
and outwardly directed, ‘spaced air ‘de?ecting. segments
described. These throw control devices can modify the
de?ning air ?ow channels, and a series of interconnected
air streams of a standard line of dirifusers to meet special,
requirements for air ?ow in any given installation atv
outwardly ‘and downwardly diverging vane pairs extending
small [cost and with ‘simple installation on the diffusers.
The invention is hereby claimed as followsz,
into at least some of said air ?ow channels with the lower
, 1.‘ An air diffuser having a series of substantially paral
edges of said vane pairs in approximate or actual contact
with the upper surfacev of the lower de?ector vane of the
lel air de?ect-or vanes with air de?ecting surfaces disposed
respective channel- into which the respective- vane pairs
at an angle with respect to the axis of said diffuser, and
a throw control device comprising a series of longitudi
11. The di?’user of claim 10 wherein said interconnected
nally aligned, diverging'connected vane pairs intercon 25 vane pairs have means frictionally holding said vane pairs
nected with the next adjacent vane pairs at the apex of
on the spaced, upwardly directed, rear segments of said
said diverging wane pairs by a narrow neck, clip-on means
diffuser vanes.
12. The di?user of claim 11 wherein said means is a
attaching said throw, control device on the axially rear
ward side of said diffuser with said vane pairs diverging
slot between the interconnected vane pairs with a tab in
axially forwardly and outwardly between said de?ector 30 each slot in frictional contact with said upwardly directed,
vanes into approximate contact with said air-de?ecting
rear segments.
surfaces of said de?ector vanes.
13. A throw control device comprising a series of 10m .
gitudinally aligned, diverging, connected vane pairs inter-'
2. An air rdi?iuser with a' series of substantially parallel,
spaced’ air de?ector vanes with air de?ecting surfaces at
connected with the next adjacent vane pairs at the apex
an angle with respect to the axis of the diffuser, said vanes 35 of said diverging vane pairs by a narrow neck, and means ' V
- for attaching said throw control device to an air di?user.
de?ning air ?ow channels therebetween, and a throw
control device comprising a series of longitudinally aligned,
14. A throw control device comprising a series of lon
gitudinally aligned, diverging, connected vane pairs inter-.
diverging, connected vane pairs interconnected with the
next adjacent vane pairs at the apex of said diverging
connected with the next adjacent vane pairs at the apex
of said diverging vane pairs by a narrow neck, each vane "
‘vane pairs by a narrow neck and mounted on said diifuser
with vane pairs in at least some of said channels and
of said vane pairs having a sloping, bottom edge of a
diverging outwardly'toward said air de?ecting surfaces.
slope substantially parallel with the bottom edges of 'the
3. An air diffuser with at least two series of substantially ‘I
other vanes, and means for attaching said throw control
7‘ parallel, spaced air de?ector vanes‘ with air de?ecting'sur
. faces at an angle with respect to the ads of the diffuser,
device to an air fdi?’user.
> 15. A throw control device comprising’ a series of di-,
verging, connected vane pairs interconnected at the apex
‘ said vvanes de?ning air flow channels therebetween, and a
throw control device comprising ‘a series‘ of longitudinally
, aligned, diverging, connected vane pairs interconnected;
with the next adjacent vane pairs at vthe apex of said
diverging vane pairs by a narrow neck and mounted on .50
of said diverging vane pairs by a narrow neck, said vane ,
pairs being spaced apart by slots between said pairs, and >
tabs ‘on one of the sides of the diverging vanes,'said> 1'
tabs extending into said slot substantially toward the next' 1
at least‘ one of said series of de?ector vanes with vane
adjacent vane in said series of vane pairs to provide fric- ~
pairs in said channels and diverging voutwardly toward
tional clips between said vane pairs for attaching said throw
said air de?ecting surfaces.
control device on an air di?user.
4. An air diffuser with at least one series of spaced,
16. The ‘throw control device of claim 15 wherein said
. substantially parallel, air-de?ector vanes with air de?ecté 55 vane pairs take the form of the two equal sides of a
triangular base, right angular fmstopyramid.
ing surfaces disposed at an angle-with respect to the axis
17. A throw control device comprising a series of di
of said diffuser, each series of de?ector vanes adapted
verging, connected vane pairs interconnected at the apex
to de?ect the air ?owing in the channels between the
spaced-‘vanes in a laterally outward direction from the
of said diverging vane pairs by a narrow neck, each vane
diffuser, and a throw control ‘device. mounted on said 60 of said vane pairs having a sloping, bottom edge. of a
diffuser comprising a series of longitudinally aligned pairs
slope substantially
vanes, said vane
edges ofslots
the .
between said pairs, and tabs on one of the sides of the
of vanes positioned in said channels, the vanes of said
pairs diverging outwardly toward said air ‘de?ecting sur
faces, the outwardmost air channel having at most a frac
tional part of a vane pair.
diverging vanes, said tabs extending into said slot'sub-l' 65 stantially toward the nextaadjacent vane in said series’
5. The dilfuserof claim .4 wherein the outwardmost air
of vane pairs to provide ‘frictional ‘clips between said vane
pairs for attaching said throw control device ‘on main
channel of the series of air de?ector vanes into which
said vane pairs, extend is free of a vane pair of said throw
6."The-di?user of claim 4 wherein the vane pairs'of 70'
' said throw control device extend into outwardly successive
7, air channels of said dilfuser'beginning with the innermost
of said channels,’ and wherein at least the outermost of
said channels is free of vane pairs of said throw control
. ‘device.
References Cited in the ?le of this patent
2,301,045 ' ‘ Heath _____V_'_ _________ __ Nov. 3, ‘1942.
Dauphinee ____________ __ Dec. 9, 1947 .
O’Day ____..'_ _____ _;___ Feb. 14, 1956
2,735,352 I
De Muth ______ __' ____ __ Feb. 21. 1956'
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