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sept, 17, '1946.
c. M. HELYAR
2,407,743 '
AIR DRAFT TIMING AND VOLUME CONTROL y
Filed April so,v 1942
2 Sheçts-Sheet l
sept. 17, 1946.`
c. M, HELYAR
' `
2,407,743
AIR DRAFT TIMING AND VOLUME CONTROL
Filed April 30, 1942 '
2 Sheets-Sheet 2'
.5
Patented Sept. 17, 1946
2,407,743 `
UNITED \ STATES 'PATENT oFFIcE
2,407,743
, AIR DRAFT TIMING AND VOLUME CONTROL
charles M. Heiyar, saint vital, Manit'oba, canada
Application April 30, 1942,)Serial No. 441,248
12 Claims. (ci. 110-__72)
2
My invention relates to an air draft timing and
volume control assembly particularly but not ex
clusively for automatic stokers, designed to be lo
cated within the air duct leading to the retort
thereof, an object of this invention being to pro
vide a device of the character described, by the
V means being provided to regulate the volume of
air fed to the dormant ?re bed.
l
As a result, the Violent kindling action of a
full head of air under forced draft, can, and some
times does have the elfect of extinguishing the
?re completely, blowing the remaining incandes
use of which, at the commencement of each cycle
of stoker operation, the fuel bed will be given an
cent particles up the chimney. When this ex
treme
is not reached, a considerable quantity of
opportunity to kindle without the intervention
of a forceddraft, until there is su?icient incan 10 ?y-ash is blown about inside the ?re box to set
tle on the castings and effectively insulate the
descence and burning strength in the fuel bed to
same against the transmission of heat..
Warrant the introduction of a gradually increas
Dealing with the effect upon a ?re bed, of the
ing volume of air.
shutting off of the fan at the conclusion of a
_ f_l furtheruobject of my invention is to provide
an assembly of the character herewithin de
scribed, by ther use of- which, at the conclusion
cycle of stoker operation, I would explain that
15 two conventional expedients are followed in con
struction and installation. The A?rst is to pro
vide a heavily weighted damper within the air
duet leading to the retort, so that immediately
of raicycle of stoker operation, the fuel bed may
continue to drawa natural draft through the
st'oker air duct for a predetermined period of
ti1_ne,_suchk draft being however, gradually ob
str-uctedand eventually closed off.
V
20
ural chimney draft. The vother is to provide no
damper in the duct, which permits of the con
tinuance of a natural draft after the stopping
j A Vfurther object of my invention is to provide
an assembly of the character herewithin described
which is of eminently simpli?ed construction, can
readilyV be installed by service men following sim
pli?ed-instructions, can readilyV be adjusted to the
conditions of any stoker, Will give long service
andlcannot readily become out of order.
With the above more important objects in view
after the fan stops, the damper will drop, being
suf?ciently heavy to resist being lifted by nat
of the fan.
25
_
-
_
The ?rst expedient results in the ?re being
suddenly banked at a moment when valuable vol
atiles are being liberated, these volatiles thus,
being deprived of 'the necessary oxygen required
and such other minor objects as may appear as 30 to ignite the same. With the second expedient,
a ?re can burn itself out before the next cycle
the speci?cation proceeds, my invention consists
essentiallyV in _the arrangement and construction
of stoker operation commences.
immediately following the commencement of a
>
0.9 Di cycle of stokeroperation so as to give the fuel
bedan opportunity to kindle while in its initial
attenuated state, thereafter permitting the pas
ing*V and Volume control assembly, in situ with
both dampers closed.
'
,
i
sage of a “nursing”'draft as the heat of the fuel
AÂFigure 2 is similar to Figure 1 but showing both
dampers fully open.
»
~ _
*
'
4,0
, Figure 3 is an end elevation of my assembly. '
i Figure 4 is a -perspective detail illustratingthe
» Figure 5 is a detail illustrating my airdischarge
1
-
v
-
>
v:Figure 6- is a perspective detail illustrating the
structure -employed -tov adjust my ~measuring
damper.
~
~
~
In the drawings like characters of reference I
bed increases and the ?re grows stronger, and
from there gradually increasing as more coal is
fed-
structure' employed to adjust my control damper.
elbow and associated valve;
i
the passage of air from the fan for a short period
scribed, reference being had to the accompanying
drawings, in which:
, . Figure 1 is a side elevation of my air draft tim
-
My assembly is therefore designed to 'obstruct
of; parts all asV hereinafter more particularly de
45
,
.
.._
In conventional stoker practice, it should _be
understood that a fixed damper `is, provided in
the forced air duet, the damper being adjusted
to each particular job.
As an arbitrary exam
ple, it may be .said that such damper is adjusted
to cut off four ?fths of the area of the duet. '
It therefore follows, that When a thick -and
indicate corresponding parts in the different ?g 50 possibly
dense?fueI bed has been `built up,- that
ures._1-
I;
- _
I
~ V,according to conventional practice in the con
struction and operation of automatic stokers, the
fan is synchronised to start up simultaneously
such fuel bed will resist the penetration of a
forced draft.
It is therefore necessary to in
crease the volume of air so as to overcomeiob-i
-but this` cannot be done with a fixed
with the _motor operating the coal feed screw, no 555 structions,
damper and consequently valuable products of
2,407,743
3
combustion liberated, cannot dissipate their full
thermal efficiency owing to lack of oxygen.
With my assembly, when a fixed, dense and
hot fuel bed has been created, I am able to
overcome the resistance to the passage of air by
permitting an increase in the volume of air which
will pass through the duct, a vo1ume which is
only limited by the capacity of the fan and thus
the fuel bed-of anautomatic stoker to which my
assembly *has _I'been ?tted, will never be over
nourished or unclernourished with air to impair
its thermal efficiency.
In view of the foregoing brief résumé compar
ing my assembly with conventional Apractice, -a
therewith similarly to the quadrant plate 1. A
sleeve 26 similar to the sleeve 8 is freely mount
ed on the trunnion between the plate 2.5,and the
wall, ..a IQuadrant lock 21 similar to .the quadrant
lock 9 being secured for rotation with the sleeve
so that the foregoing parts may ybe caused to
rotate as a unit,
résumé which could be considerably tampli?ed,
I will proceed to describe the construction of my
assembly.
4
the trunnions projecting on either side of this
vane, also being journalled _in the frame 23, the
opposite side wall of the duct, or both.
The trunnion 24 projects beyond the wall 6
similarly to the trunnion 5, a quadrant plate 25
being secured to the end thereof for rotation
,
.At any convenient point upon the length of
a stoker duct I, I locate an intermedially jour
nalled volume regulating damper 2 capable of
,
Upon the 'sleeve =2~6 isa trip rod 28 of the con
115 figuration best illustrated in the accompanying
Figure "6, capable of intercepting the lever 29
Lbest :illustrated in Figures 1, 2 and 6, provided
with the right angled portion 29', which lever
is 'journalled in the bearing 33, being angulated
20 adjacent the bearings and therefore projecting
through the wall 16 `'into the interior of the duct
where it angles Ebackwardly as 'II have indicated
sealing one side of the duct from theother com
pletely. ,It is generally found convenien't l.w-hen
at Sl in Figures land `l`2,1ina1l5y 2beinganlgulated
inserting ga damper Vin a Vduct to frame Vthe same
a'sçby means -of the'frame 3, which, however, yI
do Anot 'claim Âto be part vof my invention. A
as fat 32, transversely lof the duct Vand >as best
illustrated fin Figure 5 extending lfreely through
a transverse drilling in the headf-33of the 'valve
2G so that rotation of Ithe lever in a clockwise
small A-stop 4 may -also 1be provided to prevent
rotation of the damper 2 in a counterclockwise
direction with respect'to the accompanying “Fig
direction beyondthe limits imposed bythe stop.
ures A-1 and 2, will liftthe-valve.
4'One-of the trunnions 5 of ythe damper '2 pro
jectssubstantially*beyond the side "wall 35 of the
electric-coil :in fthrough?which- current is designed
duct, a qu-adrant plate l'l being secured to *the
to pass upon the commencement of -a cycle ~'of
end thereof for rotation therewith and vwith `the
plate. A s`1eeve'8 ``is also f-reely `mounted upon the
trunnions between the Quadrant plate'l and the
wallv'ü, a radial. Quadrant lock 19 of Lthefconñgura
ti'on clearly fillustrated 'in the Vaccompany'ing- Fig
.
Secured to thewall 46 below the A-ring 114 *isian
stoker operation to heat the ring *Hi andthe heat
motor 1,!2, and finally, those parts of _?the-*fore
35
ure zlfbeing secured -for rotation with the sleeve
8; lThis'Quadrant lock, itwill be seenfterminates
at~~the=lower 'end' thereof in a reverse-'angulated
portion 1!!! lprovided with the set-screw ll Which
is -capableofficlamping onto the larcuateedge'o'f
the -pl'a-te 'I atanydesiredpoint -so that the sleeve
and Lthe'trunnions, and-consequently the -damper
going structure which?are positioned upon the
outer Vsideof the duct l, lare enclosed Withinthe
housing
the end wall '36 of this -housingfbe
ing providedv with'the air Aescapeaperture131 'for
the -purpose-presently tolbe described.
'
Proceeding now todescribe theoperation ”of
my assembly, I Would explain =that irmnediately
upon Ithe commencement of a »'cycle of stoker
operation, the -co'il 434 `=commences to heat up `and
radiatei-tsiheat 1against the ring M. fHoweverfa
.
~
certainvilength of time will elapselbefore *the-ring
iSecure'd a-t _its inner -end to theb sleeve 8 Vis a 4,5 has absorbedsu?icient heat-to transmit -an'yfto
bi-metallic heat -`motor 'IE-formed of spiral bi
theibi-'me'tallicfheat motor or coil [2 'and'during
metal tape and `'substantially like la spiral-type
that time, the *fuel bed in the fstoker retort çis
thermostat. SšIPheouter end '5,3 of Jthe --motor 172
kinding :naturally *rather than vbeing Lblown
is -anchored -atfa convenient point upon fthe pe
apart vand struggling against =a Violent >drašft of
rimeterof a-fairly bymassive heat retaining 'ring
[4 which surrounds "the motor, thisring being
'Eventually, the _coil -or ib-i-metal tape 'of' the
preferably imade of cast iron or-some other isub
motor 12 commences 'to `lengtlfien and unwind
too, moves as a unit.
air.
s'tance capable of l`retaining Vheat fairly efficient
ly. This'ring is clamped tojthe wallšü.
i
hn?offsetlportion l'â of'V the ring :Id/is provided _
withlthe passage Plt, .Which passage -opens :onto
the i internal ,circumference . of the>ring ,at :one .end
thereof, right angling at uthe other .end thereof
as I have indicated by :the chain-line ,ring AElin
Figure lgand by the parallel chain lines :ll' in
Figure 5, and opening upon the posterior surface
IB of the offset portion and in alignment with _an
air _discharge `port IQ which includes an aper
ture (not shown) in the wall 6 and .an upwar'd
ly directed elbow Vprovided `with the 'vertically
movablevalve'zü.
V
.
-
V''Also within the duct l but spaced vfrom the
damper 2 'and upon the retort side thereofis
an Vair ?evv responsive vane 2! normally Vbiassed
to the .position'illustrated in vFigure 1, andalso
preferab-ly mounted Within a frame 22 similar Vto
the frame 3, a stop 23 being provided similar =to
the stop 4.
'
»
.
a
~
-
opening Lthe damper ' 2 v'very s'lowly and gradually
permitting air therepast.
`
f
' ~
-
'k
'Thesair lflowing therepast will graduaHyac
quire su?icient?volume'to 'lift? the lya'ne 2 I, and-at
this point, I would speciñcally-explain, as willjbe
clearly noted from Figures ~1 and 2,-that the vane
lZI does not entirely seal the duct `| -asdoesthe
damper 2l When closed, the upper and 'lowerhori
zorit'alwedges 53% and `39 of the -vane 12l providing ,
the'nfarrow itr'ansverse Vspaceslltil>V and 'M Kat'top
and'bottom through 'lwhich?aksmall 1volume of air
may @pass without raisingfth'efdamper,
'
=At alcertainrstage,V after the fuel "bed has ibe
comef replenished~with coal `andthe šsame' ist-giving
off its products o_f combustion freely, the- control
damper '2 will 'have-f'rotated almost as far as I
havelshown in the Laccompanyingi'Figure '21, thus
permitting the passage of a certain volume-ofb
airto' `liftthe vane 2l» almost as far as `~I_ -have
shown it jin fthe same figure. f VThe accumulated
heat fwithin'fth'e ringl |f4hand the-continued radia
`This vane will :preferably be mounted to swing
about a line .above its central horizontal axis, 75 tionof heat from~the coil '34, will-eventual-l-ylmove
2,407,743
6
the control damper still further as for example,
plate and vane, I am able to provide accurately.
for every installation.
In conclusion, although the title of this speci
fication directs my invention to its use for auto
matic stokers, I desire to explain that the same
Would also be practicable and useful in certain
other industrial arts such for example as in the
drying of a mass of material varying in density.
I therefore do not Wish this speci?cation to be
10 interpreted as limiting my rights under thispat
to the position as actually illustrated in the ac
companying Figure 2 at Which point the in
creased volume of air Will cause the vane 2| to
rise still further, and to the point actually shown
where the trip rod 28 will intersect the lever 29,
rotating the same to a small extent and causing
the valve 20 to open.
Opening of the Valve 20 -permits the escape of
air through the port l9, through the passage IG
to impinge upon the motor [2 tending to cool
the same, thereby contracting it and causing the i
damper plate 2 to rotate slowly in the opposite
ent to the use of my invention on automatic
stokers but only as limited by the appended
claims.
`
and closing direction. In this way, it will be seen
Since various modi?cations can be made in my
that I have provided an accurate means for gov 15 invention as hereinabove described and many ap
erning and controlling the maximum volume of ' parently widely different embodiments of same
air to be permitted into the retort. Air dis
made Within the scope of vthe claims Without de
charged through the port l 9 may escape through
parting from such spirit and scope, it is intended
the aperture 31 in the end Wall 36 of my casing
that all matter contained in the accompanying
35.
.
20 speci?cation shall be interpreted as illustrative
As I have previously indicated, a considerable
only and not in a'limiting sense and I desire only
volume of air at Substantial pressure is required
such limitations placed thereon as are speci?cally
to penetrate through a dense, thick fuel bed--a
expressed in .the accompanying claims.
greater volume, that is, than Would ever practi
What I claim as my invention is:
cably be permitted With a ?xed damper, the po 25
1. An air draft timing and volume control for
sition of Which is a compromise to provide at
automatic stokers, comprising in combination
least reasonable efficiency under a variety of ?re
With the air duct thereof a rotatable volume reg
bed conditions.
ulating damper and a rotatable ?ow responsive
Therefore, it is to 4'be understood that When a
vane normally biassed to one position and mov-I
fuel bedis Well ?lled with coal, giving up its vola 30 able from such position by an amount dependent
tiles freely, my control damper 2 is in such posi
on the flow therepast, said vane being positioned
tion that it is permitting a greater volume of air
in spaced relationship with respect to said volume'
to pass and force its way through the bed than
regulating damper, within said air duct and upon
Would be the case with a ?xed damper, the air
the downstream side of said regula-tlng damper,
discharge port I 9 and associated valve being pro 35 the
area of said vane being less than the right
vided to check the damper 2 against ipermitting
angled .tr-ansverse area of said duet, a heat motor
the admission of an even greater, and excessive
connected to said regulating damper and gov
Volume of air, as the motor |2 gets hotter and
erning the movement thereof so as to permit an
increases in length.
~
increased ?ow therepast as the temperature of
At the conclusion of a cycle of stoker operation, 40
said
motor increases, a coil for heating said motor
at Which time the fan comes to rest, it Will be
upon the commencement of a cycle of stoker op
recognized that -my control damper 2 is open to
eration, means for cooling said motor upon dthe
the maximum extent, and the same will only close
opening
of said vane to a predetermined extent,
at a very slow rate of speed, as the heat motor
a trunm'on rotatable With at least said damper
and the heavy cast ring 14 surrounding it, give
or said vane, a pl-ate secured for' rotation .to and
up their heat so that a brisk natural Vdraft may
With
said trunnion, a loose sleeve on said trun
continue to be indrawn into a ?re bed, the oxy
nion, and means projecting from said sleeve, said
gen therein being utilized to ignite the volatiles as
means being secured for unitary movement to
they continue to be liberated but at a decreas
and With said sleeve for looking said plate -and
ing rate.
50x said sleeve in a plurality of selected positions so
Referring to the adjusting means associated
that said plate and sleeve may rotate as a unit.
With my damper and vane and including the
2. An air draft timing and volume control com
Quadrant plates 'I and 25 et seq. respectively, it
prising
in combination with an air duct, a volume
will readily be understood by reference to the ac
regulating damper, a ?ow responsive vane nor
companying Figures 1 and 4 for instance, that
mally biassed to one position and being inovableA
rotation of the quadrant lock 9 in a clockwise di
from such position by an amount dependent on
rection following the loosening of the screw ll,
the
?ow therepast, said vane being positioned in
around the quadrant plate, Will increase the ten
spaced relation With respect to said volume regu
sion of the motor L2. Conversely, rotation of the
arm 9 in the opposite direction, will slacken the 60 lating damper, within said air duct, a heat motor
connected to said regulating damper and gov
motor, and in this connection, I desire to ex
erning vthe movement thereof so as to permit an
plain that I generally prefer that my motor be
increased ?ow therepast as the temperature of
so adjusted that the damper 2 is caused to bear
said motor increases, means for periodically heat
against the stop 4 with a certain amount of
pressure When in closed position, so that it will 65 ing said motor, and automatically operable means
for cooling said motor upon the movement of
not commence to rotate immediately the bi-metal
said vane from its normal position a predeter
tape of the motor commences to deform respon
mined extent.
sive to the adjacent heat source.
3. An air draft timing and volume control com
prising
in combination With an air duct, a volume
charge lvalve l9, it will readily be recognized that 70 regulating
damper, a ?ow responsive vane nor
rotation of the quadrant lock 21 on the quadrant
As to my flow responsive vane 2l and air dis
plate 25, together With the sleeve 26 and the trip
rod 28, will control the point at Which the-'valve
20 opens responsive to the action of the rod 29,
and so, With these adjustments on each of my
mally biassed to one position -and being movable
from such position by an amount dependent on
the. ?ow therepast, said vane being positioned in
spaced relation with respect to said volume regu
75 lating damper, Within said -air duct, said vanebe
2,407,743
7
8
a heat radiating ring around Asaid motor, means
ing located upon the downstream 'side of said
regulating damper, a heat'motor connected to
said regulating damperfand governing the 'move
for periodically heating said ring 'and thereby
ment thereof so .as to 'permit 'an 'increased flow
said “motor, and means for cooling said motor
upon the movement of 'said'vane from its normal
therepast as 'the .temperature 'of said motor in
position 'a predetermined extent.
_
7. An air 'draft timing'and volume vcontrol 'com
prising in combination with an air duct, 'a'volu'me
tor, an air discharge :port in said air duct Acon
regulating damper, a flow responsive vane nor
structed land arranged to 'direct its discharging
mally biassed to one position and being movable
air onto 'said motor, .together With 'an 'associated
normally closed valve, and `means designed so vas 10 from said position by an amount dependent upon
the flow therepast, said vane being positioned in
to `open said valve and permit air from within
spaced relation With respect to said'volume resu
said duet to impinge upon and cool Vsaid motor
lating damper, Within said duot, said vane being
When said vane is moved from its normal position
located upon the 'downstream side of *said regu
apredetermined extent.
lating damper, `a heat motor connected to said
4. An air draft timing and volume 'control com
regulating damper and governing the movement
prising in combination With an air duet, a volume
thereof so as to permit an increased flow lthere
regulatin'g damper, 'a flow responsive vane nor
past as the temperature of said motor increases,
mally biassed to one position .and being movable
a heat radiating ring around said motor, means
from "said _position by an .amount dependent 'on
.the flow therepast, said vane being positioned in 20V for periodically heating said ring and thereby
said motor, and an Vair discharge port in said
spaced relation with respect to said volume regu
air duct constructed and arranged to direct itsV
lating damper, within said duct, said vane being
discharging lair onto 'said motor together With
positioned upon the down-stream side >of said reg
an associated valve normally 'closing said ducts,
ulating damper, 'a heat motor connected to said
creases, means for periodically 'heating Lsaid mo
regul'ating damper and governing the movement 25 said valves being operable to open position by the
movement of said vane from its normal position
thereof so as to permit an increased ?ow there
a predetermined extent, thereby permitting air
from within said duct to impinge upon said motor
past a's the temperature of said motor increases,
means for periodically heating said motor and an
air discharge port 'in said air duct constructed
to cool the same.
and arranged to direct its discharging air onto 30
said motor together 4with an associated valve nor
`8. An air draft timing and Volume control com
prising in lcombination with an air duct, a volume
regulating damper, a ?oW responsive vane nor
mally biassed to one position, 'and being movable
mally closing said 'ducts, said valve being oper
a'bl'e to open position by the movement of said
from such position by an amount dependent on
vane fromv its normal position a predetermined
extent xt'hereby permitting the air from within 35 .the flow .therepast, said vane being positioned in
spaced relation With respect to said volume regu
said duct to impinge upon said motor to cool the
lating damper, Within said duet, said vane being
same.
5. An air draft timing and volume control com
prising in combination withra'n 'air duct, ”a volume
regu'lating damper, a ?ow responsive vane nor
mally biassed .to one position and being movable
from said position by an amount dependent upon
the ?ow 'therepast, said vane being positioned in
spaced relation with respect to said volume regu
lating damper, within said duct, said vane being
positioned upon the downstream side 'of said reg
ulating damper, a heat motor connected to Vsaid
regulating damper and governing the movement
located upon the downstream side of said regu
lating damper, a heat motor connected to said
40 regulating damper and governing the movement V
thereof so as to permit an increased flow there
past `as the temperature of said motor increase's,
a heat radiating ring around said motor, means
for periodically heating said ring and thereby
said motor, an air discharge port in the form of
an elbow in one wall of said duct constructed and
`arranged to direct its discharging air onto said
motor, a valve normally closing said port Within
said duct, a lever connected to said valve, said
past las-'the temperature of said motor in'creases, 50 lever being rotated by the movement of said vane
when the latter is moved from its normal posi
means for periodically heating said motor, *an air
tion a predetermined extent to open said valve
discharge port in the form of an elbow in one
thereby permitting the escp'e of air from within
Wall of sai-d duet constructed and arranged .to
said duet-through said port to impinge upon said
direct its discharging lair onto said motor, a valve
normally closing said port within lsaid duct, *a , motor and cool the same.
9. An air draft 'timing and volume control com
lever connected to said valve, said lever being
prising in combination With an air duct, a volume
rotated by .the movement of said vane when the
regulating damper, a ?ow responsive vane nor
latter is moved from its normal position a pre
mally biassed 'to one position and being movable
determined extent to open said valve, thereby
permitting the escape of air 'from within'said duct 60 from such position by an amount dependent upon
the flow therepast, said vane being positioned in
through said port to impinge upon said motor
thereof so as to permit an increased 'flow there
and cool the same.
6. An air 'draft timing and volume control 'com
prising in combination `Vwith lan air duet, a volume
regulating damper, a flow responsive Vvane nor
mally biassed 'to ,one position land being movable
from said position by an amount dependent on
the ?ow therepast, said vane being positioned in
spaced relation with respect to said volume regu
lating damper, within said Vduct, said vane being
positioned upon the downstream side of said reg'
spacedrelation with respect to said volume regu
lating damper, Within said duet, said vane being
positioned upon the downstream side of said reg
' ulating damper, said vane being supported on
projecting trunnions, a plate secured for rotation
to one of said trunnions, -a sleeve on the trunnion
ulating damper, a heat' motor connected to said
to which said plate is connected, said sleeve being
interposed between said vane and said plate, a
radial lock Vs'ecuring saidl plate 'to 'said sleeve, a
trip rod also secured to said sleeve, a heat motor
connected to said regulating damper .and gov
regulating damper and governing the movement
erning the movement thereof so as to permit an
increased ?ow therepast as the vtemperature of
past as the temperature of said motor increases, 75 said motor increases, means for periodically heat
of same so .as to permit an _increased ?ow there
2,407,743
10
ing said motor, an air discharge port in .the form
of an elbow in one wall of said duct constructed
and arranged .to direct its discharged air onto
said motor, a valve normally closing said port
within said duct, a leverl connected to said valve,
said lever being engaged'by said trip rod upon the
rotation thereof, together with said lock, plate
and vane, a predetermjifned extent to open said
valve and permitting :the passage of air from
within t_said duct through said elbow to impinge
on said motor and cool the same.
ing .the movement of said damper so as to permit
an increased ?ow therepast as the temperature
of said motor increases, a heat radiating ring
around said motor, an air discharge _port in the
wall of said duct constructed and arranged to
direct itsy discharging air onto said motor, a valve
normally closing said port, means for periodically
heating said ring and thereby said motor, and
automatically operable means for opening said
10 valve to permit air to escape through said port
10. An air draft timing and volumeV control
volume'
comprising
regulating
in combination
damper positioned
With an air
therewithduct, a f'
in, a heat motor connected .to said damper upon '1
the external side of said ,duct and governing the i'
and impinge on said motor .to cool the same and
thereby move said damper towards or into the
closed position following the opening of said
damper a predetermined extent.
12. An air draft timing and volume control
comprising in combination with an air duct, a
volume regulating damper, a ?ow responsive vane
creased flow .therepastiasrthe temperature of said .f_ normally biassed .to one position and being mov
motor increases, an air discharge port in .the wall
able from such position by an amount dependent
of said duct constructed and arranged to direct
on the ?ow .therepast, said vane being positioned
its discharging air ont'o said motor, a valve nor
in spaced relation with respect .to said volume
mally closing said port, means for periodically;
damper, within said air duct, said vane
heating said motor, afnd automatically operablefff" regulating
being positioned upon the downstream side of
means for opening said valve to permit air to es-@r said regulating damper, a heat motor connected
cape through said portjand impinge on said motor_ :_ to said regulating damper and governing the
to cool same and thereby move said damper -to-jx
movement thereof so as .to permit an increased
wards or into the closed position following .th
opening of said damper a predetermined maxi-fff ?ow therepast as the temperature of said motor
movement of said damper so as to permit an in- f]
mum extent.
_
11. An air draft timing and volume contro
comprising in combination with an air duct,
volume regulating damper positioned within saidf'f'
air duet, a heat motor connected to said damper
upon .the external side of said duct and govern
increases, means for periodically heating said
motor, means for cooling said motor upon the
movement of said vane from its normal position
a predetermined extent, the area of said vane`
being less than .the right angled transverse area
of said duct.
i
CHARLES M. HELYAR.
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