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Патент USA US2112272

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VMarch 29, 1938.
M. DE LIN
2,112,272“
DRAFT CONTROL FOR FURNACES
Filed June 8V,
24
Ill
J6
1956
’ 2 Sheets-Sheet l
March 29, 1938.
M. DE LIN
2,112,272
DRAFT CONTROL FOR FURNACES
Filed June 8, 1956
2 Sheets-Sheet 2
l Patented Mir. 29, 193s
‘ 2,112,272
l' - UNITED STATES PATENT OFFICE
2.11am '
4 nam coN'moL Foa mNAcas
Munn De un, nounou, nnen., mimm- io n°1
land Furnace Company, Holland, Mich., a cor
poration oi’ Michigan
application :une s. 193s. serial No, 84,111 s
_4 cum. _ (ci. izo-l-zs'n
The present invention relates to furnaces. par
ticularly to means for controlling the draft there
of the door ÍI_i through which ashes and the
like under the grate are removed), this lid being
through; and its object is. generally, to -provide
pivotally mounted to swing by its weight to the
closed position shown in Figures 2 and 3; an
opening to the combustion chamber, being the ci
door i3 through which fuel is supplied thereto,
having the closure i2; a damper il turnable by
its shaft I 5 to the closed position shown in Fis
such means improved in »various respects here
5 inafter set forth; and more particularly, to pro
vide a plurality of draft controls having means
foroperating `the same alternately or relatively
to each other; and further, to provide draft con
trols> for the radiator ring and the smoke dis
' 10 charge therefrom respectively and means for
thus operating the same: and further, to provide
said controls and a control for the air inlet
and means- for operating the same alternately
_or relatively to each other: and further, to pro
15 vide means for thus operating the controls by
the opening and closing -of thev closure for the
fuel-supplying door ofthe furnace; and further,
_to provide adjustable means for thus operating
‘the controlsv selectively.
20 ' These and any otherl and more specific objects
hereinafter appearing> are attained by, and the
invention-finds preferable embodiment in, the
illustrative furnace structure particularly de
scribed inV the ~body of this specification and
25 illustrated by the accompanying drawings, in
which:
.
Figure 1 is an elevational front view of a hot
air furnace provided with draft controls and
means for operating the same;
30
`
Figure 2 is a like view showing the controls
in another. relative position;
ures A1, 2 and in solid lines in Figure 4 to cause
the smoke to pass in the direction indicated by l0
the arrows in Figure 4 from the combustion
chamber’s outlet 5 and through said ring in order
to more effectively heat the air inside the casing,
this damper being turnable a quarter way-around
to open position shown in Figure 3 and in dotted 15A
lines in Figure 4 to permit- the smoke to pass more
directly from said outlet i into the smoke pipe 8
to thus lincrease the force of the draft through
said draft passage and the chimney; and the
checkV draft opening I8 through the wall of the 20
smoke » pipe having. a closure lid I'l plvotally
mounted to swing by its weight to the closed po
sition shown in Figures l and 3.
These draft controls are moved relatively to- ’
each other to closed or open positions by operat- 25
ing means including cables secured to vthe con
trols respectively and a suitable cable-adjusting
device for tautening or slackening the same, the
illustrated form of such a device including a
turnably mounted shaft i9 having crank arms 30
20, 2| manually turned as by the knob handle 40,
.Figure 3 is a like view showing the controlsy A cable,.the chain 22, passing over pulleys indi
cated at 2K3, 24, 25, 26 is secured at one end to
in still another relative position;
Figure 4 is a horizontal sectional view of por
35 tions of the structure taken on line >4_4 of Fig
ure l; and
Figure 5 is a horizontal sectional view of other
portions taken on line -5-5 of Figure l.
The hot air furnace illustrated by these draw
40 ings has'the combustion chamber l enclosed by
a casing 2 with an air heating space 3 therebe
tween, and a draft passage for conducting air
to said chamber and smoke and products of com
bustion therefrom. SaidV passage extends from
45 its air inlet l, through the combustion chamber
and to a chimney (not shown) `and includes the
outlet 5 for smoke from the combustion chamber,
the radiator ring 6 surrounding the'upper part
. the crank arm 20 and at its other end to the lid
9, this chain's length being such that when said 35
crank arm is turned to lower position shown in
Figure 1 the chain is tautened to raise said lid>
and open the air inlet I; but when this crank
arm is turned to upper position shown in Figures 40
2 and 3 the chain is slackened to permit said lid
to fall to the position shown in these views and
close said air inlet. A cable, the chain 28, pass
ing over pulleys indicated at 29, 30 is secured at
one end to the other crank arm 2| and at its 45
other end to the lid i1, this chain’s length being
such that when the crank arm is turned to lower
position, in the interrelative position of certain
of said chamber for heating air in the casing to ' of the draft controls as shown in Figure 2 (and as
50 be'discharged through suitable hot air pipes 1,y hereinafter explained), the chain is tautened to 50
and the smoke pipe 8 leading to the chimney.
This draft passage has at several points along
its length controls for the draft therethrough,
such controls including: the closure lid 9 for said
55' air inlet I (desirably formed through yclosure, lq
raise said lid and open the check draft opening
I8 as seen in said view; but when this crank arm
is turned to upper position shown in Figure 1
(in said relative position of the draft controls)
the chain is slackened to permit this lid to fall to 55
2
2,112,272
the position shown in that view and close said
check draft opening.
.
In another interrelative position of such draft
controls as shown in Figure 3 (and as herein
after explained), this chain 23 is slackened to
permit the lid I'l to fall and close the check
draft opening I6 when the crank arm 2| is in
_lower position shown in said view.
The closure I2 for the fuel-supplying door I3
hingedly mounted at 3l has an outwardly ex
I4 and closes lid I'I (Figure 3) and the closing of
closure I2 closes damper I4 and opens lid I'I (Fig
ure 2) the lid 9 remaining closed in both cases;
and that in the oppositely turned position of shaft
I3 and lid 3 is opened and the damper I4 and lid Ch
I‘I are closed in the closed position of closure I2
(Figure 1).
The weight of_ the crank arm 38 is desirably
great enough to swing the unlatched closure I2 to
open position. The hook end 4I of block 42`may 10
tending arm portion 32 to which one end of a
be engaged with any of the links of chain 33 in
cable, the chain 33, is secured at 34, and passing
over pulleys indicated at 35, 36, 31 this chain is
secured at its other end to the crank arm 38
of the shaft I5. The weight of this arm urges
the damper I4 to open position shown in Figure
order to adjust the required deflection thereof, and
3 and in dotted lines in Figure 4.
'
When the latch 39 is turned to released posi
tion seen in Figure 3 and the closure I2 is opened
as shown in that view, this chain 33 is slackened
to permit the arm 38 to fall and open damper
I4 thus causing the smoke to pass directly from
the combustion chamber’s outlet 5 into the smoke
pipe 8, so that smoke will be carried by the draft
thus increased through the chimney and will not
pass outwardly from said chamber through the
fuel opening I3; but when the closure I2 is shut
the chain 33 is tautened to raise arm 38 and again
close the damper I4.
30
The parts of the means for operating the draft
controls are so combined and operatively con
nected as to function in an improved manner for
one lof the crank arms 20, 2| may be held by a
set screw indicated at 43 in desired turned posi
tion on shaft I3 to adjust the relative annular posi
tion of these crank arms. A coiled spring 44 in
chain 33 renders the same somewhat elastic to
cushion its action.
‘
The invention being intended to be pointed out
in the claims, is not to be limited to or by details 20
of construction and arrangement of the particular
embodiment thereof illustrated by the drawings
or hereinbefore described.
I claim:
1. In a furnace having a combustion chamber
with a fuel-supplying door provided with a closure
and a draft passage having an air inlet provided
with a closure lid said passage including a smoke
pipe having a check draft opening provided with a
closure lid and a radiator portion between the 30
chamber and the pipe provided with a damper
closed to conduct smoke through said portion and
attaining certain desirable ends. For instance: - opened to conduct smoke directly into the pipe,
-although the purpose of the control damper I4 means for operating the damper and the lids by
is to direct the draft through the radiator ring for the opening and closing movements of the closure
heating the air in the furnace casing., this damper including: a cable extending between the closure
thus used tends by obstructing the draft passage and the damper tautened by the closing move
to choke it with soot, etc.; the check draft control ment of the closure to close the damper and
I6, I'l has no such air heating effect but it does not slackened by the opening movement -of the closure
obstruct the draft passage to choke it with soot. to open the damper: an adjusting device; a second
It is therefore desirable to employ these draft cable extending between said device and the lid
controls at times selectively and alternately, of the check draft opening; a third cable extend
although both are to be employed to increase the ing between said device and the lid of the air
draft when the furnace door’s closure I2 is open. inlet; and a pulley movably in engagement with
To effect such alternate use the chains 28, 33 are the second cable, lhaving a hook manually ad
so connected that the movement of one affects
justable in connection with the ñrst cable. the
that of the other. In the illustrated construc
adjusting device being movable to a position
tion, this connection is made by engaging the wherein the first cable tautened to close the
hook end 4I of the block 42 of the pulley indicated damper tautens the second vcable through said
at 30 with a link of chain 33.
connection to open the lid of the check draft open
In Figure 1 the shaft I9 of the adjusting device ing and slackens the third cable to close the lid
I8 is shown turned to the position wherein the of the air inlet, the adjusting device being movable
draft controls are held thereby in that interrela
to another position wherein the first cable
tive position in which the furnace operates in its tautened to close the damper slackens the second
55 usual air-heating manner; that is, the lid 3 is
cable to close the lid of the check draft opening
open and the damper I4 and the check draft lid I'I
and said device in its same position tautens the
are closed, the closure I2 being also closed.
third cable to open the lid of the air inlet.
In Figure 2 the shaft I 3 has been turned to the
2. In a furnace having a combustion chamber
position wherein the draft controls are held there
with a fuel-supplying door provided with a closure
60 by in that interrelative position in which the
and a draft 'passage having an air inlet provided
draft through the combustion chamber is de
with a closure lid said passage including a smoke
creased and fuel consumption is lessened; that is, pipe having a check draft opening provided with
the lid 9 is closed and the lid I'I is opened, but the a closure lid and a radiator portion between the
damper I4 continues closed to heat the radiator chamber and the pipe provided with a damper
65 ring.
closed to conduct smoke through said portion and
In Figure 3 the shaft I9 remains in the same opened to conduct smoke directly into the pipe,
turned position as in Figure 2 so that the lid 3 means for operating the damper and the lids by
remains closed, but the closure I2- having been the opening and closing movements of the closure
opened the chain 33 is thereby slackened to permit including: 'a cable extending over a pulley be
70 arm 38 to fall and open damper I4, and the side
tween the closure and the damper and tautened
wise mutually deflected relation of chains 33 and by the closing movement of the closure to close
28 and their length below the pulleys 31 and 23 the damper and slackened by the opening move
have been so changed that, mutually acted upon ment of the closure to' open the damper; an ad
through their connection (the pulley 38 and its justing device: a second cable extending over a
75 block 42), the opening of closure I2 Opens damper ëeçolid pulley between said device and the lid of
35
40
50
55
60
65
70
75
3
2,112,272
the `check draft opening; a third cable extending
arm of said device and the lid of the air inlet; and
between said device and the lid of the air inlet;
and a connection manually adjustably joined to
the first cable between the first pulley and the
damper and having a pulley carrying the second
cable between the second pulley and-the lid of the
a connection including a member manually detach
ably engageablewith the first cable at selected po
sitions in the length thereof and having a pulley
check draft opening, the adjusting device being
movable to a position wherein the ñrst cable
tautened to close the damper tautens the second
10 cable through said connection to open the lid of
the check draft opening and slackens the third
cable to close the lid of the air inlet, the ad
justing device being movable to another posi
tion wherein the first cable tautened to close
15 the damper slackens the second cable to close the
lid of the check draft opening and said device in
its same position tautens the third cable to open
the lid of the air inlet.
3. In a furnace having a combustion chamber
.20 with a fuel-supplying door provided with a clo
sure and a draft passage having an air inlet pro
vided with a closure lid said passage including
a smoke pipe having a check draft opening pro
vided with a closure lid and a radiator portion
25 between the chamber and the pipe provided with
a damper closed to conduct smoke through said
portion and opened to conduct smoke directly in
to the pipe, means for operating the damper and
the lids by the opening and closing movements of
30 the closure including: a cable extending between
the closure and the damper tautened by the clos
ing movement of the closure to close the damper
and slackened by the opening movement of the
closure to open the damper; an adjusting device
35 including a rotatable shaft with Aa pair of crank
arms; a second cable extending between one arm
of said device and the lid of the check draft open
ing; a third cable extending between the other
carrying the' second cable, the shaft being turn»
abie to a position wherein the first cable tautened
to close the damper tautens the second cable
through said connection to open the lid of the
check draft opening and slackens the third cable
to close the lid of the air inlet,` the shaft being 1o
turnable to another position wherein the first
cable tautened to close the damper slackens the
second cable to close the lid of the check draft
opening and said device in its same position taut
ens the third cable to open the lid of the air inlet 15
and the arms being turnable on the shaft to se
lected _angularly spaced secured positions there
on.
4. In a furnace having a combustion chamber
with a fuel feed door and a draft passage having
a damper, a draft inlet door and a smoke pipe
with a draft check, flexible connecting means
between the draft inlet door and the draft check
consisting of chains and means connected there
to eñective to open the draft check when closing 25
the draft inlet door and vice versa, flexible con
necting means between the feed door and the
damper for opening the latter when the former
is opened and vice versa and consisting of a
single chain, and a pulley over which the check 30
controlling chain passes, said pulley having
means manually adjustably engageable with a
selected link of the damper controlling chain for
holding slack out of the check controlling chain
when the damper is closed and permitting the 35
check controlling chain to slack to close the
check when the damper is opened.
_
MARTIN DE LIN.
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