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Патент USA US2133803

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0m. 18, 1938.
Filed May 6, 1937
//V V5/V 7'01?
Patented Oct. 18, 1938
Merrill K. Brady, Kirkwood, N. J.
Application May 6, 1937, Serial No. 141,124
1 Claim.
As hereinafter described, my invention in
cludes an annular frame in which a damper plate
is pivotally' mounted so as to normally close an
opening through said annular frame by gravita
5 tion of said plate, and the essential feature there
of is speci?c means including a weight which
may be shifted in an arc of a circle with respect
to the damper plate
axis of the pivot of
10 gravitative effect of
tending to close it in
toward and away from the
the plate to thus vary the
the weight upon the plate
said frame.
. My invention is particularly applicable for
controlling the in?ux of atmospheric air to a
?ue leading from an oil burning furnace‘ to a
15 chimney to admit more or less air to said ?ue
in accordance with the ?uctuations in natural
convection draft of the ?ue and chimney. How
ever, it is applicable to any other embodiment in
Which it is desired to regulate ?uid pressure or
20 exhaust upon one side of the regulator by admis
sion of ?uid from the opposite side.
My invention includes the various novel fea
tures of construction and arrangement herein
after more de?nitely speci?ed.
In said drawing: Fig. I is an elevation of a
convenient embodiment of my invention inserted
in a ?ue pipe.
Fig. II is a vertical sectional view of the struc
ture shown in Fig. I taken on the line II, II, in
30 the direction of the arrows in the latter ?gure.
Fig. III is an elevation of the inside of the reg
ulator shown in Figs. I and II; the ?ue pipe
shown in Figs. I and II being omitted.
In said ?gures; the annular frame I, which
35 is conveniently formed of cast metal, is circular
at its perimeter, which includes the rim ?ange
2 which abut-s against the end of the ?ue pipe 3,
as shown in Fig. II.
The perimeter of said an
nular frame I also includes the circular ?ange II,
40 which as shown in Fig. II is slightly tapered in
ward with respect to said ?ue pipe 3, to facili
tate the introduction of the annular frame into
said pipe in the position shown in that ?gure.
In order to readily secure said annular frame
45 I in said ?ue pipe 3, I ?nd it convenient to pro
vide the latter with the outwardly extending
bead 3', conveniently formed by a rolling opera
tion and to provide the ?ange 4 of said annular
(Cl. 236-45)
by the screw 5’ in Fig. II, to thus readily, rigidly
connect said annular frame I with said pipe 3.
The outer portion of said annular frame I is
also inclined inwardly as indicated at 9 in Fig. II,
to facilitate the passage of'airthrough said an- . -
nular frame I, to the interior of said pipe 3.
Said annular frame I has ‘the arcuate inwardly
extending stop?ange III at the lower portion
thereof and the arcuate inwardly extending stop
?ange II at the upper portion thereof; said stop 10
?anges being in axially offset relation, as shown
in Fig. II, to contact with opposite sides of the
damper plate I3. Said plate is conveniently
formed of thin pressed sheet metal having a
cylindrical rim ?ange I3’, to stiffen it. Said l5_
plate is hung upon the pivot wire I4 which ex
tends horizontally above the horizontal diameter
of said plate I3, through opposite sides of said
?ange I3’ on said plate and has its opposite ends
respectively ?tted in bearing lugs I5 projecting 20
from said annular frame I.
Washers I6 are in
terposed between the inner circumference of said
annular frame I and the ?ange I3’ of said plate
I3 to center the latter in the opening through
said annular frame so that it is free to oscillate 25
upon said pivot wire I4 and normally gravitates
into vertical position, shown in Fig. II. I ?nd
it convenient to provide the stop ?ange III with
an inwardly extending lug I 0’ to support the pad
of resilient material I8 which is conveniently ce- 30
mentedvto said lug III’ to receive the impact of the
lower edge of said plate I3 noiselessly.
Said pivot wire I 4 has the pendant bight I4’ in
termediate of its length to ?t around the screw
bolt I9 which extends through said plate I3 and 35
serves to prevent endwise movement of said wire
I4, with respect to said annular frame I. Said
bolt I9 has the handle head 20 permanently rigid
ly connected therewith; said head being conven
iently formed of readily fusible metal, for in- 40
stance, aluminum, cast upon said bolt. The op
posite end of said bolt I9 extends through the
radial arm 22 of the weight 23 and is rigidly con-‘
nected therewith by the nut I9’. Said bolt I9,
which otherwise would be free for axial and ro- 45
tary movement with said weight .23 in said plate
I3 is adapted to be readily ?xed in different an
gular positions with respect to said plate I3, by
frame with three lugs respectively indicated at 5, means of the milled nut 24 engaged with said
50 6, and 1, each respectively provided with set bolt I9 and bearing upon the washer 25 which en- 50
screws 5', 6’, and ‘I’. Said set screws are re— circles said bolt I9, in contact with the outer
tracted when it is desired to introduce said an
face of said plate I3.
nular frame I into the position shown in Fig. II '
It is to be understood that the arrangement
and thereupon each of the screws is adjusted out
above described permits said weight 23 to be
55 wardly to engage within said bead 3' as indicated readily manually adjusted, by the handle 20. in an 55
are with respect to said plate I3, from a position
parallel with said pivot wire M, in which it has
the least gravitative effect, to a position at right
angles to said wire M, in which it has the greatest
gravitative effect, to thus oppose more or less re
sistance to oscillatory displacement of said damp
er plate I3, from its normally closed position
shown in Fig. II. Such adjustment is effected in
accordance with the strength of the draft in the
10 pipe 3 which is a branch of the ?ue pipe extend
ing from the furnace to the chimney; so that the
gravitative effect of said weight 23 upon the damp
er plate [3 may be increased in correspondence
with increment in the force of the draft tending to
15 open said damper plate I3 inwardly with re-'
spect to the ?ue pipe 3 and thus regulate the ef
fect of such draft upon the oil burner or other
source of heat in the furnace to insure that the
volume of atmospheric air drawn into the furnace
20 by the draft in the ?ue shall be such as to effect
satisfactory combustion of the fuel.
Although I find it convenient to secure my im
proved regulator in connection with the ?ue pipe
by means of the set screws above described, en
25 gaging within the bead as shown in Fig. II; it
may be secured by such screws in a ?ue pipe
which is not provided with such a bead, and mere
ly by pressure upon the inner cylindrical surface
of the pipe. Moreover, any other convenient
30 means for securing the regulator frame inthe
desired position may be employed.
Therefore, I do not desire to limit myself to the
precise details of construction and arrangement
herein set forth as it is obvious that various modi
?cations may be made therein without departing
from the essential features of my invention as de
?ned in the appended claim.
I claim:
In a draft regulator, the combination with an
annular frame, of a substantially plane damper
plate pivoted in said frame, above its center of
gravity, and thus adapted to normally gravitate
to position to close the opening of said frame; of
a screw threaded member extending through 10
said plate, intermediate of its width and approx
imately at the axis of its pivot in said frame, hav
ing at one end a radially extending handle out
side of said plate and having at its other end a
radially extending weight pendent at the inside 15
of said plate; said screw threaded member and
its appurtenances having freedom of movement
for adjustment in an arc of a circle with respect to
said plate; and a nut on said screw threaded
member accessible from the outside of said plate; 20
whereby, said weight may be adjusted from hori
zontal to vertical position to vary its gravitative
effect upon said plate from miniumm to maximum
and be temporarily rigidly secured in any‘adjusted
position, by said nut; the pivotal support for the 25
damper plate comprising a wire extending hori
zonally above the center of gravity of said plate,
into bearings in‘ said frame at its opposite ends,
said wire having a 'bight intermediate of its
length partly extending around said screw 30
threaded member; whereby said member pre-'
vents longitudinal displacement of said wire.
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