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Патент USA US3087684

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April 30, 1963
Filed July 24, 1959
Patented Apr. 30, 1963
Malcolm W. Patrick, Redford, Ohio, assignor to Hupp
Corporation, Cleveland, Ohio, a corporation of Virginia
which is automatically held in closed position except
when the combustion device is operating and the work
ing temperature has reached a predetermined value.
During the interval between the initiation of combus
{tion and the time when combustion apparatus reaches full
Filed July 24, 1959, Ser. No. 829,364
operating temperature, ef?cient combustion can be
3 Claims. (Cl. 236-145)
achieved only if the combustion air is supplied in amounts
substantially in excess of that normally required when
This invention relates to draft regulators and more
the normal operating temperature has been reached.
particularly to such regulators which are positioned in
the ?ue between a combustion device ‘and chimney for 10 Heretofore there has been no provision for the supply
of excess air for the starting cycle.
controlling the admission of air into the ?ue to stabilize
In accordance with the present invention, the thermo
the draft through the flue.
static control element maintains the draft regulator closed
As is well known in the art, the draft from a combus
during the starting operation. Thus all of the draft pro
tion device such as a gas or oil burner in a domestic
heating system should be maintained at a constant level 15 duced by the chimney must be directed through the burn
er thus effectively providing increased air ?ow to assure
for e?icient, safe operation. Heretofore it has been pro
combustion e?iciency during starting.
posed to provide a controlled opening in the flue usually
Additional objects and advantages of the present in
adjacent the chimney to permit atmospheric air to be
vention will become apparent as the description proceeds
drawn into the flue when the draft in the chimney be
20 in connection with the accompanying drawings in which:
comes excessive.
FIGURE 1 is a side elevation of a portion of the ?ue
A regulator of this type which is disclosed and claimed
system in which the draft regulator of the present inven
in United States Patent 2,721,705 comprises generally a
tion is installed;
counterweighted regulator vane which is inserted into
FIGURE 2 is an enlarged end elevation of the portion
the end of the horizontal ?ue pipe of a conventional oil
furnace. The vane is normally held in closed position by 25 of the apparatus shown in FIGURE 1 looking in the di
rection of the arows 2-2 of FIGURE 1;
the counterweight and is moved away from closed posi
FIGURE 3 is a vertical section taken along line 3-3
tion automatically by the differential pressure existing
of FIGURE 2;
across the vane when the chimney draft becomes ex
FIGURE 4 is an enlarged elevation of the thermo
cessive. The counterweight is manually adjustable to
static element of this system removed from the remainder
render the resistance offered by the regulator vane to the
of the structure, the view being taken in the direction of
pull of the chimney draft substantially uniform through
arrows 4-4 of FIGURE 3;
out the range of movement of the regulator to thus main
FIGURE 5 is an end elevation of the thermostatic
tain the draft throughout the combustion apparatus as
of FIGURE 4; and
nearly constant as possible.
While this device provides adequate protection for the 35 FIGURE 6 is an enlargement of a portion of FIGURE
3 showing details of construction.
combustion unit, nevertheless it does decrease the over
all e?iciency of the system to some extent since the regu
lator vane may remain open even during intervals during
Referring now more particularly to the drawings, the
the production of objectionable quantities of smoke and
ine?icient combustion and sometimes produces objec
The sub-assembly 10 includes a main frame member 26
draft regulator assembly indicated generally at 10 is in
stalled in the horizontal portion 12 of a T-?tting 14, the
which combustion is not taking place thus drawing heated
air out of the furnace room through the chimney which 40 opposite end of the portion 12 being connected to the ?ue
pipe 16 of a furnace 18. The vertical portion 20 of the
draws outside air into the furnace room with a substan
T-?tting is connected through suitable conduits 22 and
tial loss of heat in the heating system and its environ
24 to a chimney (not shown).
The draft regulator assembly of the present invention
Another undesirable condition arises when a combus
tion cycle is initiated. During this period the vane often 4.5 is a unitary sub-assembly which may be easily installed
or removed from the open end of the pipe section 12.
oscillates during the stabilization period which leads to
tionable noises in the system.
‘ With the foregoing considerations in mind, it is the
which is provided with a cylindrical portion 28- received
with a sliding ?t in the open end of the member 12.
50 The frame member 26 is also provided with an annular
lip 30 which limits inward movement of the frame mem
principal purpose and object of the present invention to
ber into the open end of the pipe 12. Projecting radi
provide improved draft regulators which eliminate the
ally inwardly from the inner end of the cylindrical por
above mentioned disadvantages of all prior known sys
tion 28 is a radial wall 32, the inner edge of which de?nes
tems and provide increased ?ame stability and combus
tion efficiency and substantially reduce the noise level 55 an opening 34 which is circular except for a horizontal
chordal section 36. Extending substantially parallel with
in the system.
the chordal section 36 is a slot 38 which is of greater
[It is also an object of the present invention to provide
improved draft regulators which are automatic in oper
ation and which are automatically held in closed posi
tion whenever the gases in the line are below a certain
depth at its midpoint than at its opposite ends for a pur
pose to appear.
The vane member 40‘ is an essentially circular sheet
temperature, i.e. when the combustion apparatus is not
operating or during the interval after the initiation of
the combustion cycle and before the ?ue has reached
metal stamping of slightly smaller diameter than the open
operating temperature.
poses. Welded or otherwise secured to the inner surface
of the vane 4t) is a downwardly projecting leg 44 of a
It is also an object of the present invention to provide
improved draft regulators which are simple yet effective
in operation, which comprise a minimum number of
operating parts and which may be readily installed in
existing systems as well as in new equipment.
In accordance with the present invention, these and
other objects are accomplished by the provision of a
novel thermostatically controlled draft regulator unit
ing 34 in the frame member 26. The vane member 40
is provided ‘with an annular head 42 for stiffening pur
pivot member which is provided with a sharp reverse bond
as at 46 which is then smoothly again reversely bent to
extend outwardly of the frame member 26 and which ter
minates in a horizontal portion 48. The opposite edges
of the reversely bent portion 46 of the pivot arm are
suspended on the lower edge portions of the slot 38 for
free swinging movement.
Adjustably secured to the horizontal portion 48 of
the arm assembly is a counterweight 50 which is held in
place by a carriage bolt 52 which extends through an
elongated slot provided in the portion 48 of the arm.
Because of the elongated slot, the position of the counter
weight may be adjusted as desired to adjust the degree
of differential pressure across the vane 40 necessary to
move the vane away from its fully closed position. Fur
ther details of the mechanism thus far described may be
had by reference to the aforesaid US. Patent 2,721,705.
An important feature of the present invention to which
strictive, the scope of the invention being indicated by the
appended claims rather than by the foregoing description,
and all changes which come within the meaning and range
of equivalency of the claims are therefore intended to
be embraced therein.
What is claimed and desired to be secured by United
States Letters Patent is:
1. A draft regulator for a furnace ?ue comprising a
vane adapted to be pivotally mounted in a ?ue for swing
10 ing movement between open and closed positions, said
vane being gravity-urged toward closed position and being
detailed reference will now be made is a thermostatic as
movable toward open position by air pressure differen
sembly indicated generally at 54 which modi?es the pres
tials, a bi-metallic element, and means for cantilever
sure-gravity actuation of the vane 40‘. The assembly 54
mounting one end of said bi-metallic element within a ?ue,
comprises a stamped one-piece sheet metal bracket 56 15 said bi-metallic element adapted to be exposed to the
which is provided at one end ‘with ?anges '58 and 60 at
gases in a ?ue, said bi-metallic element having an opposite
tached by screws 62 and 64 to the radial ?ange 32 ad
free end directly engageable (with said vane to urge said
jacent the opposite ends of the slot 38. The bracket 54
vane toward closed position when the temperature of the
is provided with integral cross pieces 66 and 63 and to
gases within said ?ue is low, said opposite free end of said
the former is welded an offset portion 70 of a bi-metallic 20 bi-metallic element being moved out of pressure contact
strip 72. The main operating portion 74 of the strip 72 is
with said vane upon an increase in the temperature of the
connected to the attachment portion 70 by a vertical
gases within said ?ue to permit said vane to move toward
section 76. When the thermostatic assembly 54- is re
and away from said closed position independently of said
moved from the assembly shown in FIGURE 3 and the
bi-mctallic element.
unit is cold, the free end of the strip portion 74 bends
2. A draft regulator for a furnace ?ue comprising a
downwardly into contact with the cross-piece 68 and as
vane adapted to be pivotally mounted in a ?ue for swing
the temperature rises, the strip portion 74 moves up
ing movement between open and closed positions, a
wardly from this limit position. When the unit is in
counter-weight rigid with said vane for opposing initial
stalled as shown in FIGURE 3, the free end of the strip
movement of said vane away from said opening, an elong
portion 74 bears against a lug 78 struck from the portion 30 ated bracket, means for mounting said bracket within a
44 of the vane pivot arm.
?ue, said bracket extending away from said vane and
The parts are so dimensioned that the free end of the
adapted to extend into a ?ue, and a ?exible bi-metallic
bi-metallic strip 74 exerts a substantial pressure on the
lug 78 which is effective in a direction to close the vane
element cantilever mounted at one end on the end of
said ‘bracket remote from said vane, said bi-metallic ele
40 when the furnace is not in operation, for example in
ment adapted to be exposed to the gases within a ?ue,
an ambient temperature of 75 degrees. Upon a rise in
said bi-rnetallic element having an opposite free end en
temperature occasioned by operation of the combustion
gageable with said vane to urge said vane toward closed
device the closing force exerted by the bi-metallic strip
position when the temperature of the gases within said
is gradually removed. Accordingly, when the furnace
?ue is low and said free end of said bi-metallic element
or other combustion device is not in operation, ambient 40 ‘being moved out of pressure contact with said vane upon
temperature prevails in the ?ue and the vane 40 is held
an increase in the temperature of the gases within said
in closed position both by the action of the counterweight
?ue to permit said vane to move toward and away from
50 and by the bi-metallic control assembly ‘54. The op
said closed posit-ion independently of said bi-metallic
eration of the bi-metallic unit '54 effectively prevents the
passage of ambient air out through the chimney and
3. A draft regulator for a ‘furnace ?ue comprising a
eliminates the possibility of any noise occasioned by 0s
frame ‘adapted to ?t within a ?ue, said frame having a
cillation of the vane 40 under these conditions.
central opening, a vane pivotally mounted on said frame
During the starting cycle of the combustion apparatus
for movement toward and away from. said opening, a
the vane is also held in closed position thus assuring that
counter-weight rigid with said vane for opposing move
all of the air passing out through the ?ue ?rst passes into 50 ment of said vane away ‘from said opening, an elongated
the combustion chamber assuring a stable non-smoking
bracket attached to and extending away from said frame
and e?icient ?ame during the critical starting cycle. Sub
sequently as the temperature of the ?ue progressively
increases, the free end of the bi-metallic strip moves up
wardly decreasing the closing pressure exerted on the lug
78 and finally at a predetermined elevated temperature
inwardly thereof, a ?exible bi-metallic ‘strip cantilever
mounted at one'end on to the end of said bracket remote
from said frame, said element being adapted to‘ be ex
posed to the gases within a ?ue, said bi-metallic element
having an opposite free end directly engageable with said
the bi-metallic strip exerts no pressure on the lug 78.
It is to be noted that the decrease in the force exerted
vane to urge said Vane toward said opening when the
temperature of the gases Within a ?ue is low, said free end
by the free end of the bi-metallic strip is gradual so that
of said bi-metallic element being moved out of pressure
the amount of air admitted through the draft regulator 60 contact with said vane upon an increase in the temperature
will gradually increase in accordance with the combustion
of the gases within a ?ue to permit said vane to move
conditions to create rapid stabilization of the ?ame and
toward and ‘away from said opening independently of said
to maintain the ?ame in a stabilized condition. Sooting,
be-metallic element.
due to poor combustion generally prevalent under ex
treme weather conditions at the combustion start is mini
References Cited in the ?le of this patent
mized and excessive outside air in?ltration into the furnace
room which was previously unavoidable ‘when the furnace
Cunningham> __________ __ May 15, 1934
was out of operation are eliminated with the consequent
improvement in the overall heating e?iciency of the sys
Monney ______________ __ July 25, 1939
Brace _______________ __ Aug. 27, 1940
Sabins ______________ __ Dec. 2, 1941
Patrick ______________ __ Oct. 25, 1955
The invention may be embodied in other speci?c forms
without departing from the spirit or essential character
istics thereof. The present embodiment is therefore to
be considered in all respects as illustrative and not re
France ______________ __ June 4, 1955
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