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Патент USA US2587000

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Feb; 26, 1952
A. w. scHAcH
Filed May 26, 1947
A I heart W. Schach
Patented Feb. 26, 1952
AlberifW; Schaeh,.R;ockf0rd, Ill., assignor to Bar
ber-Gohnan Company, RockfortLJlL, a corpo
Application May'26,11947", Serial No. 750,616
4: Claims. ( Cl. . 277-1)
This ‘ invention relates 'to' a" damper“ for" reg
.ulating the flow of.v air through. a-passage, and". I
The vanes I'G‘are offthesamecross section and
similarly spaced apart inrparallela relation with
the ' general object is. "to; provide a ‘ damper “which
, isadapted for controllingrthe~ ?ow ofiain'und‘er
their: tail portionssecured by pins 2|v to the side
relatively high pressure; andilwhich avoids the
ets‘ 214 secured.» toxthe. plates 22- carry spaced
rollers- 23: engageable with the wallsv of the frame
12. so that the unitslides‘readily- within the latter
creation of any substantial noise as the damper
approaches closed'position.
A more detailed object is to provide a damper
in which the air‘ ?ow is adjusted by relative
movement between two sets of vanes; both, pre
senting air foil cross sections in all'degrees‘ of
plates:- 22: slidable. in; the; frame. l2‘. . Brack
The thicker edge - portions‘ of thev vanes
l6 project-.fromv the plates 22 and- the-ends‘ of
: the’vanes. I 5v are‘ spaced from the frame l2: so that
by: movementiof the-plates: 22-, Vthe=vanes I6‘ may
opening of the damper..
be: moved-in; betweenv the.v vanes Is to therposi
Other objects and'advant'ages of ‘the invention
tion-:shown: in. phantom in, Fig; 2» in which; the
will become apparent from“ the following» de
thicker edges of the two sets of vanes lie- in a
tailed description taken in connection‘ with: the 15:. common plane and themovable vanes ‘complete
ly'?lI the spaces intervening'ybetween the station
accompanying drawings, in'which
ary vanes l'5ztherebyg completely interrupting; the
Figure 1 is across-sectional view of an'airduct'; '
equipped with a damper embodying the novel
?ow of air through the duct ll.
As the plates 22 and the vanes I6 are retracted
features of the present invention.
Fig. 2 is a cross section taken along the line 20 from this position,.the spaces between the vanes
15 are widened progressively permitting a cor
responding increase in the ?ow of air through
2-2 of Fig. 1.
Fig. 3 is a cross section taken along the line
3—3 of‘ Fig. 2.
the damper. Maximum opening of the damper
Fig. 4 is a perspective view of one of the
is achieved when the vanes l6 reach the posi
damper vanes.
25 tion shown in full in Fig. 2. In all degrees of
opening of the damper, the vanes of both sets
For purposes of illustration, the improved
damper is shown in the drawings as a means for
present so-called air foil cross sections to the
controlling the flow of air through a duct H
passing air thereby avoiding turbulence in the
branching off from a main supply duct [0. The
latter and offering minimum resistance to the
damper is a self-contained unit mounted within 30 air flow. As a result, the damper is adapted to
a rectangular frame [2 received in and secured
control the ?ow of air maintained at relatively
to walls of the branch duct and selectively ad
high pressures.
justable by turning a knob IS on the outer end
It has been found that the noise incident to the
of an operating shaft [4 which projects through
?ow of air through the damper may be substan
one wall of the frame and branch duct.
35 tially eliminated by providing shallow recesses
25 in opposite sides of the vanes [5 at the narrow
In the form shown, the damper comprises two
edges thereof, the recesses extending edgewise
separate sets I5 and [6 of vanes of air foil cross
section mounted in staggered relation for move
and partially across the vanes. To permit the
vanes l5 and [6 to be duplicates, similar recesses
ment of the vanes of one set edgewise into and
out of the spaces intervening between the vanes 40 are formed on the movable vanes [6.
Various operating means may be provided for
of the other set to vary the width of such spaces
and thereby control the ?ow of air through the
adjusting the frame 24 axially of the duct II to
thereby vary the degree of damper opening.
duct I I. Herein, the vanes [5 are stationary
each having its opposite ends secured by pins H
Herein the operating means comprises a gear 26
to supporting plates I'Ia which are ?xed to the 45 fast on the shaft I 4 which is journaled in bear
ings 21 on the frame l2 and projects through a
frame 12 so that the vanes are held in uniformly
slot 28 in one of the plates 22. This gear meshes I
spaced parallel relation with the space interven
with a rack 29 secured to the inner side of the
ing between the thickest section of the vane be
ing substantially equal to such thickness. To
plate 22. Thus, by turning the knob l3, the gear.
provide the desired air foil cross section, the op 50 causes the rack to move back and forth along the
posite side surfaces [8 of each vane are substan
tially ?at and converge toward each other from
the wider semicircular edge l9, substantially in
tersecting at the other thin edge 20 the width of
stationary rack correspondingly moving the
plates 22 carrying the vanes I6.
I claim as my invention:
1. A damper comprising two sets of spaced
each vane being several times the thickness 55 parallel-vanes of an air foil cross section having
thick edges rounded to a contour substantially
thereof. The outermost vanes of each set lie
against the sides of the frame I2.
equal to a semicircle and ?at sides tapering sub
stantially to a point from the diameter of said
semicircle, the width of each vane being several
times its maximum thickness adjacent its thicker
thin edge, certain of said vanes being formed
with laterally opening recesses spaced along op
posite sides of said thin edges and extending par
edge, and (means supporting the vanes of the
tially across the width of said vanes, and means
respective sets in staggered relation and for rel
ative edgewise movement in unison to bring the
supporting the vanes of the respective sets in
staggered relation for relative endwise movement
in unison to bring the vanes of one set into the
vanes of one set into the spaces between the
spaces between the vanes of the other set where
vanes of the other set wherby to vary the ef
by to vary the effective area of the air passage
fective area of the air passage through the two
sets of vanes, the vanes of both of said sets be 10 through the two sets of vanes, all of the vanes
ing arranged with their wider edges facing in the
being arranged with their thicker edges facing in
same direction.
the same direction.
4. A damper comprising two sets of spaced
plurality of uniformly spaced parallel vanes of
parallel vanes of air foil cross section, each hav
air foil transverse cross section having thick 16 ing substantially ?at sides tapering from a thick
rounded edge to a thin edge, means supporting
edges rounded to an approximately semicircular
the vanes of one of said sets for bodily edgewise
contour and generally ?at sides tapering sub
2. An air flow control damper comprising a
movement in unison into and out of the spaces
stantially to a point, the width of each vane be
between the vanes of the other set, certain of
ing several times its maximum thickness, a sec
ond similarly arranged set of vanes of similar 20 said vanes being formed with laterally opening
recesses spaced in a staggered relation along op
air foil cross section and substantially equal max
posite sides of the vanes at said thin edges and
imum thickness, and means supporting said sec
extending partially across the width of said
ond vanes for bodily edgewise movement in uni
son into and out of the spaces between said ?rst
vanes, said rounded edges of the vanes of both
sets facing in the same direction and the vanes
of each set being spaced apart distances sub
stantially equal to the thickest parts of the vanes
The following references are of record in the
of the other set so as to effect a complete closure
?le of this patent:
of said spaces when the rounded edges of all of 80
the vanes are disposed substantially in a common
3. A damper comprisingtwo sets of spaced
Weiskope ________ __ Dec. 26, 1933
parallel vanes of air foil cross section having
sides tapering from a thick rounded edge to a 85 2,082,335
Hart _____________ __ June 1, 1937
Green _______ __~____ Mar. 13, 1934
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