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Патент USA US2406088

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“Aug. 20, 1946.
> P. s. MARTIN
. Filed Dec. 6, 1941
2 Sheets-Sheet 1
~57 '
Patented Aug. 20,’ 1946
Perry S. Martin, Harrisonburg, Va,
‘ Application December 6; 1941:, Serial No; 422,011?f
" ’
"I _
1 1- ‘ ..
8 Claims. (erase-e5)
This invention relates: to draft regulating de
vices‘ and has for its-principal object the provif
draft tube l8, the frame work or‘chassis l9 sup
porting the thermostat‘ ZOand-Y‘the casing 2 l. '
sion of a simple and efficient‘ regulator for use
The draft tube IB- is square in vertical cross
with space heaters burning solid fuel. ‘
section, snugly ?ttingv the‘ casting l6 and being
A further object of the present invention, is 5 ' bolted‘ thereto as at 23', by means of avpairtof
to provide a regulator for wood and coal burning
brackets 24 spot welded to the end of ‘the draft
stoves of a type‘ which will: keep’ the ?re in the
tube. Thev rear ‘of' the draft‘ tube slopes at‘ari
stove for a long period“ of time and meanwhile
angle of about 45° providing a large 0Deni‘l'1g"2-5‘ ‘
will hold: the heat of the room at a constant de
which is closed by the main damper ‘ziiipivoted:
gree within a small margin;
' ~
on: rod:v 2-‘! extending thru the sidewalls to‘the
A still further object of‘ the present‘ invention
draft vtube andbeingiheldr against‘ side to- side
is the provision'of a regulator for .a coal or'a
movement by the two? walls of the casing 21;‘ A
wood, burning" stove: which‘ will‘ respond almost
pilot valve 39 is loosely pivoted to the main
entirely t'oithe temperature of the room when
damper" 26,‘ as at 3l:, and carries a zigzag mem
therooml is at the normal temperature desired 15 ber 33 serving a dual function, to limit the open
and which will to some: extent respond to the
ing of the’ pilotvalve 30‘ andeto afford attach
heat; of. the stove should the‘. room temperature
ment for thecon'trol-ling chain 34' which not only ‘
be below normal, thus giving an anticipating
pulls the: pilot valve closed, but, preceding this
action to the control.v
act, pulls the main. damper'shut. The upper
Other objects of the. invention relate primarily 20 surface of the pilotdamper is much larger than
to details and are more speci?cally set forth in
the opening 361'through-themain» damper so the
the claims.
resistance to closing of. the pilot damper is greater
With the present day electric thermostatic"
than the resistance to turning of the main
controlsithere islno‘ di?iculty' of any kind in;
damper 26:.- on its axis 21. This pilot damper
therefore opens ?rst and closeslast, in this way
avoidinga ttoo- abrupt'opening or closing of‘ the
maintaininga room: at a closely regulated de
gree and ‘this is‘ still more‘ true'where the fuel:
is-liquid'or gaseous. There'are, however,‘ many
dwellings in. Which electrical-1y controlled devices
cannot be used", and‘: still many others in- which
the cost would: beprohibitive 'even. were the elec
tricity available.
The" present? regulator is
Theprincipal element of the chassis is'a chan
nel membenthe‘welr of? which is bent at right.
30 angles at 31 to formva. vertical portion 38 and a
adapted for: use with'either; acoal burning or a
horizontal portion 39. The flanges 40 of this
member‘ are necessarily severed near the bend
31. The: ba?le 38? forms one wall of .a vertical .
' passageway and the portion. 39? forms. the ?oor'of
Figure 1 is 'a'central section through one form 35 a communicatinghorizontal passageway. ‘ Triang
wood burning stove":
In'the drawings:-
ofmy device;
gular stiffening elements‘ 41‘ not only strengthen
Figure 2' is‘ a rear view with the rear panel
of'the mirror ba?le removed.
Figure 3 is a perspective illustrating a- portion
of the regulator with the casingremoved.
Figure‘ 4i is a detail illustrating the knife edge
bearing of the regulating 1ever.
' -
Figure 5 shows the device‘ applied‘ to a coal‘
burning circulating heater.
the two arms of the channel member, but "like
wise: afford means for supporting the upper plate
Griuwhich is part of the casing although secured
the chassis;v
Mounted on the-underside-of the web 39' cf the
channel member is a relatively heavy steel plate
45 which extends rearwardiy‘ then downwardly
and then slopes at an: angle of about 4¢5° from‘ the
‘Referring particularly to Figure l, the‘ stove 45 point 45'. As best s'e‘en‘in Figure‘ 4,>this. lliéga‘uge'
illustrated is of the woo-d burning type, and is
designated generally by the numeral. HI.v It has
a sheet steel wall ll, a?anged b'a?‘le l2. and an.
opening M of the. intake. of air. Secured around 50
this opening Mby bolts extending throughthe
ba?ie is a casting‘ l6 which is usually especially >
plate has a T-slot' atiits free end, the‘stem of‘the"
slot bearing. the‘ numeral. 41' an d‘ the ‘longer’ reach
of the slot being numbered 48. The regulating 4
lever 59' has a. T-head which ‘rests on the-sloping
portion. of the plate: 45, thus forming-a pairL of
knife edges‘ 51' which'rmaterially“adds to ‘the chi
ciency and ease of, controlxoff the regulator‘ - To‘
made for the particular style of stove and‘ may
the bottom of the lever-.iesecured a‘ strap 51?,
be sold‘ with either, the stove or the" regulator: or
carrying @a'tits lower end, the chain. 34.
both. The. major parts-of‘ .thewregulator- are the; 65 1 Referring; particularly to; Figure ' 3; two small
3 .
formed by engagement of the damper withthe
lower. end of the strap 54. Under such circumj
Zigzag bearing members 55 ‘are ‘secured'to the
?ange 48, of the horizontal web of the channel
member and in these bearing-pieces is mounted a ‘
stances air enters through the large space 83 be
'pivot rod 56, endwise movement of which is pre-v
vented by engagement with the ?anges 48. A
quite heavy cam lever 68 is secured to the pivot
rod 56and bears at the end 6| of its horizontal
air thus flowsfrom right to left in Figure 1, un
tween the edge of the draft tube, and the casing
and also through the holes 12 in the casing. This
der the open damper entering the stove through.
the casting l6 and the opening [4.
At the same time there is a slow movement of
arm on a cam 82 secured to a vertical post 83
‘passing through theweb' '39, the plate 45 and the
top casing'member 44.7 This post 63, preferably
10 air ‘from between the re?ecting ba?le face 18 and’
j the wall II‘ of the stove and also inside of the
ual knob 64 turning about a dial 65 which may, . .7 ba?le 11. The latter air passes in part through
permanently attached to the cam, carries-aman
the open end '8'! of the re?ecting ba?le, partly
through the optional opening"!!! in top of the
casing and partly from left to right, in Figure 1,
be marked in arbitrary numerals andwith arrows‘ “
showing warmer in one direction and cooler in the
At its lower. free end the cam lever 68 is tapped’
as at 86 to receivethe threaded end of the thermo-,
stat unit 28, preferably consisting of a pluralityrfj,
between the web 39 and‘ the upper sheet 44 of
the casing, thence downwardly inside of the rear
wall 2| of the casing thus passing’ across the " '
large area of the wafers of the thermostat, heat
of corrugated wafers and having a stud‘ 61 to en-v
ing thelatter by this relatively warmer air, which
afterwarming the thermostat passes into the
gage a rounded elevation 68 on the regulating lee
stove across the upper surface of the draft damper
The major portion of the casing 2| is a single
28, being directed in this path by the great quan
sheet bent like a square U,"thus forming the back
tity of air passing to the stove from the bottom
and the two sides of the regulator.‘ .The casing
has a'plurality of horizontalslots or openings 18 25 opening 83,‘; this air mostly passingbelow th
draft damper which is now horizontal.-.
somewhat above the center and has opposed ver; ‘
The passage of the small’ quantity of'warmed
tical openings. ‘H above the draft damper when ’
air is. a very important feature asit makes the
closed; and also'has a number of similar slots or
thermostat far more sensitive to increase‘in the
openings‘ 12 in the rearwall which‘, is otherwise
closed. ' The openings "provide for entry‘ of air 30 stove temperature and'would check the ?re if
the heat increased too fast, even though'the room 7
,to the draft tube. Theopenings ‘l8 allow ,ventie
were still cold? Radiant heat from‘the heated
wall liof the stove passes through the optional
The openings ‘H allow entry. of additional air and
openings 88 in the web 38 and this helpspto heat
primarily afford a view of the draft damper. The
slots “in the top of‘ the casing are optional but 35 the thermostat. Theelement 98 is a‘light'alu
minum ba?ie adapted to prevent the passage of
are foundto be quite convenient in affording a
this radiant heat when the damper is entirely
more-surej?ow-of air under certain conditions.
' lation of an insulating space, later to be described.
._ A channel‘ shaped heat ba?le TI is secured to
As the temperature of “the stove increases the.
the ?anges 48 of the vertical web 38 of the chan
nel member and also to‘the triangular'stiffening » _ thermostat expands. . Since the screw~carrying
anchored end is ?xed in space by the‘positioning
of the lever 68, such expansion of the thermostat
The front wall ‘18 of this member is
chromium plated soas to be heat re?ecting, while
the inside of this sheet is of the normal dull ?n‘
ish of the steel‘sheet. A similar piece of chro
' pieces M.
' mium plated steel is attached centrally within the
frame of the regulator, this consisting of an an‘
causes-an increased pressure on the ridge'BB of
the regulating'lever 58' which turns on itsknife
edge bearings 51 and pulls on the chain 34. The
angle of pull plus the weight'of the pilot 38 causes
a movement of the entire mass pivoted at 21 in-; ‘
gular piece 88 spot welded or otherwise secured
to the plate 45; Its re?ecting surfaces 8| and 82
provide a central ventilated insulating'space 85,
cluding the counter-weight 83 and this movement
continues as lOl'lg as the thermostat is expand
the front wall of which is the web 38; the rear 50 ing; that is, ‘until such time as the main draft
damper 26 is entirely closed. 'Ilhe pilot damper
wall, the portion 82; and‘the bottom wall, the in‘- >
is now fully open and an appreciable amount of
. tegral portion 8| of the sheet 88. The two side
further expansion of the thermostat is required I
. Walls of thisspace are formed by the two par
allel walls of the outer casing, but these are large:
ly removed'in this area by the cutting of the slots
18 at both sides. The purpose of this space 85
'is to prevent heat from passing from the stove to
the thermostat 28.. The re?ecting surface 18 like
wise aids. in this feature, as does the webv 38.
These several members are heated by the radiant
heat'from the stove and were it not for this venj
tilated insulating space 85 which cools the sur
rounding metal, a much greater quantity of heat
would be ' conducted through the metal ' to the
thermostat. vI may heat insulate the thermostat
from the cam lever‘ 68 by a small ?bre washer 84,
but in practice do not ?ndthis necessary. '
The operation of the device is as follows:
> The knob 84 ‘is moved to select the chosen heat
to be maintained, which action it will be. noted
raises or lowers the upper end 6! of the lever 68
with consequent increased movement of the
anchoredv end of the thermostat. Assuming the
before the increased pull on the chain 34' closes
this'pilot damper 38; This is an important fea
ture as it bars all possible sudden cessation of
the draft and causes the ?re to ease down,which
is particularlyimportant with fuel having a high
When the heat requirements have thus been -
met, thereis no‘movement of air from left to.
right in the upper air passageway of the regula-~
tor,that is, between the .web 38 and the top
wall 44, such heat as may rise passing freely
through the openings 14 and 81. There is, how
.ever, a movement of room temperature air from
the bottom opening 83 upwardly'past the thermo-.
- statand from right to left in the upper hori
zontal space above the channel member. _ Since
the metal of the regulator is slightly warmer than
the'room temperature, this current of air passes‘
out, through the openings. 14 and 81. As the
dampers 2'6 and 38 are now entirely closed, they
room to be. colder than desired, the main damper
also are at a temperature above that of the room.
’ 26 is wide open, that ishorizontal, the stop being "
_Air_follows the heated slopingsurface‘ of this
metal and passes out through the opening 81
through the two or more holes 88 in the channel
member. The thermostat 20 is quite near the
opening 83 so it is bathed almost exclusively in
air at the temperature of the roomand radiation
of heat from the stove is blocked by the re?ect
to room temperaure almost exclusively when the
heat requirements of the room are substantially
3. The device of claim 2 in which the air pas
sage includes three parallel ba?les between the
thermostat and the space heater at least one of
ing surface 18, the vertical wall of the ?anged
channel member l9, the ventilated insulating
the walls being of a re?ecting surface.
4. In a, draft regulator for space heaters of the
space 85 and the re?ecting surface 82.
type burning solid fuel, a damper for controlling
the admission of air to the stove, walls forming
As a con
sequence, the thermostat at such times is sub
stantially exclusively under control by the room
air and responds very quickly to any change in
temperature. It will be noted that the bosses 90
provide an air space between the casing and the
draft tube and chassis, also that the sheet 80
makes a fairlysnug ?t with the casing, being
wider than the channel member l9.
When used with a coal burning stove as in‘
a vertical passageway conducting heated air from
the stove upwardly, walls forming a second ver
tical passageway, a thermostat within said'sec~
0nd passageway and operatively connected to the
damper to increase or diminish the ?ow of air to "
the stove, a horizontal air passageway communi
cating with said two passageways, and means
cooperating with the walls to form a ventilated
Figure 5, the regulator is secured to the ash pit
air space between said vertical passageways and
' 86 by an appropriate casting 89. The slot 9| in 20 below said horizontal passageway located at sub-'
the mirror baf?e 11 is provided to receive the
stantially the elevation of the thermostat, said
casing 192 of the circulating heater so as to posi
air space serving to cool the walls of the passage
tion this baffle in the space between the stove
ways to a temperature only slightly above that V
and its light metal casing. \The operation of ‘
of the room.
the regulator when used with a circulating heater 25
5., In a regulator for a solid fuel burning
is substantially the same as has previously been
heater, a damper for controlling the admission
of main combustion air to the heater, a thermo
What I claim is:
stat operating said damper, and a series of walls
1. In a draftregulator for solid fuel burning
' between the heater and the thermostat for shield
space heaters, a horizontal draft tube, a draft 30 ing the thermostat from radiant heat from the
damper controlling the ?ow of air therethrough
heater, said walls providing a portion of the
to the heater, a vertical baffle-above the draft
boundary of an air passageway, alternately di-,
tube, a re?ector cooperating with the vertical
recting room temperature air and heater warmed
Fba?ie to form a vertical passageway adjacent the
heater, walls forming a second vertical air pas
air to the thermostat as the damper is opened
and closed, a plurality of said walls having heat
sage spaced from the previously mentioned pas
re?ecting surfaces facing in the direction of the
sageway, walls forming a horizontal air passage
communicating with the upper ends of the two
6. The device of claim 5 in which at least one
vertical passageways, a thermostat within the
of said walls is a wall of a ventilated heat insu
second‘ passageway, and a sloping wall directing 40 lating space substantially at the level of the
heated air from the spaced passage to a point
just above the draft tube, whereby when the
'7. In a regulator for a heater, a metal frame
damper is open heated air will pass upwardly
work, a thermostat adjustably carried by said
between the ba?ie and the re?ector and thence
framework, means controlled by the thermostat‘
downwardly past the thermostat, thus making 45 for regulating the heater, a casing surrounding
the thermostat more responsive to changes in
the framework on three sides, and projections on
said frame-work for holding the casing in spaced
the heater temperature when the damper is open
relation to the frame-work in order to provide
and the room is cool than it would be if the
an insulating air space between the casing and
heated air were not thus circulated.
2. In a regulator for a solid fuel burning space 50 the frame-work, whereby to shield the thermo
stat from heat from said heater passing through
heater, walls forming a heat insulating space
the casing walls.
ventilated to the room to be heated, additional
walls cooperating with said walls to form an air
8. In a heat regulator for a room heating stove,
passage completely encircling said space and
a pair of vertical walls, a sloping wall joining said
having a hot air entrance, a hot air exit near the '
walls to form three sides of a heat insulating
heater and a room air inlet further from the
space of which the sloping wall is the bottom, a
heater, a thermostat in said passage above the
thermostat mounted adjacent one of said vertical
room air inlet, adjacent said heat insulating
space and distant from the hot air outlet, and
means governed by the thermostat for control
ling the flow of combustion air to the heater from
said room air inlet whereby when said means
nearly shuts o? air to the heater, a flow of cold
air will be induced in said air passage from the
room air inlet past the thermostat to the hot air
outlet, thereby making the thermostat responsive
walls, means controlled by said thermostat for
regulating the stove, and means including said
sloping wall for directing air heated by the stove
= downwardly past the thermostat and toward the
vertical wall further from the thermostat, said
heat insulating space being open to room tem
perature and located between the stove and. the
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