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Патент USA US2131763

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Odt. 4, ‘19.38.
2,131,763
P. H. SROAT
FIREPLACE CONTAINED AIR CIRCULATING HEATER
Filed Oct. 19, 1936
2 Sheets-Sheet 1 '
lI/ ./ /
ct. 4,
1938‘-
2,131,763
P. H. SROAT
FIREPLACE CONTAINED AIR CIRCULATING HEATER
Filed Oct. 19, 1936
2 Sheets—$heet 2
Patented Oct. 4, 1938
I 2,131,763
UNITED. STATES PATENT orFI‘cE
" 2,131,763
FIREPLACE CONTAINED vAIR CIRCULATING
> HEATER
Paul H..Sroat, Portland, 0reg., as'signor to Heat
Rite Fireplace, Inc., Portland, 0reg., a corpo
ration‘ of ‘ Oregon
. ‘ Application October 19, 1936, Serial No. 106,420
9 Claims. (o1. 126-121)
The principal object of this invention is to
‘provide a ?replace heater, which is self-contained
which is susceptiblev of being easily installedto
more rapid ?ow of‘ air thru said ventsis induced
operate in and to be ‘removed from a ‘standard
the fans in the ?ues.
?replace opening. My invention is.,_designedto
?t substantially all standard sizef?replace open
ings without alteration.’ ‘ To this end, I providea
?rebox and an air jacket surrounding said?re
box thru which air is drawn, by thermal action.
fan extending across the air vent and thusa
by said air fan under the driving in?uence of
Further details of my invention are hereinafter
described with reference to the accompanying
drawings, inwhich:
,
s
.
~ ,Fig. 1 is .a sectional viewaof my self-contained
?replace heater with the center of mass indi
10 .A face plate is provided on the forward face‘ of ’ cated at X and the tipping moment induced by
10
‘said device which face plate-1 extends laterally the placement of. mass indicated by’ an arrow;
J 15
from and about the marginal edges, of the ?re~
Fig. '2 is a diagrammaticillustration of my im
place opening. Said face, plate j is sufficiently proved ?replace heater illustrating diagrammati
large that it will overlie the marginsof‘ the large cally how it will ?t into a number‘of different
standard ?replace openings while the ?rebox and sizes _of ?replace openings;
15
its surrounding casing'or jacket are sufficiently
Fig, ,3 is a perspective view of the ?rebox and
small to be received in the-mouth“ of theysmall the air jacket portions of my deviceshown sep
?replace openings.
7.
- A further object of my invention is . to, provide '
a heating device of this character which may be
supported‘upon its forward edge with ‘itscenter
of mass arranged rearwardlythereof a ‘substan
arated, portions‘of the air jacket being shown
brokenlaway to disclose details of construction
thereof;
"
‘
'
_
Fig. 4 is an elevation of a ?replace with my
20
‘improved heater shown seated therein;
tial distance. ‘The face plate of said device'is
‘Fig. 5 is a sectional view therethru taken on
adapted to bear upon .thefront, of the ‘?replace ‘the line .5-—5 in Fig. 4;
about the margins of the ?replace openingand ; Fig. .6‘ is'a vertical; section thru said device
the center of mass of said _uni_t isv so placed» that taken on the line 646 inFig. '7; '
it will tend to hold the face plate tightly against
Fig. 7 isatransverse vertical section taken
the front of said ?replac .
_
l.
said device on the line. l—‘! in Fig. 6;
‘A further object of myinvention is to provide. 'thru'
.Fig. 7a is a sectional detail of construction; and
.30 the margins of saidface plate with a sealing ele
ment of such character that it will‘ resiliently
accommodate the, irregularity to the fronts‘of
?replaces and will tend to'be compressed bythe
.35
off balance of said center of :mass. The place
ment of mass will hold said face plate with said
sealing element extending , about the margin
thereof against. the front of the ?replace so that
said'face plate is tightly sealed therewith. ;
A further object‘of my invention is to provide
a ?replace heater of this‘ character with an air,
vent so disposed as to receive the maximum radi
ated heat from the ?rebox and thus produce ef
?ciency in said device. To this end I provide the
?rebox of said device with’ two laterally spaced
.1455
?ues and provide the casing or air jacket with a
centrallydisposed vent extending upwardly be
- tween said ?ues and over the roof of said ?re
box. Thus the heat is radiated from the sides of
the ?ues .and the top of the ?rebox and heated
air is discharged outwardly into a room thru a
discharge aperture extending substantially the
entire width of said ?rebox.
To induce a more
rapid ?ow of air thru said vents ?ue gas driven
f,Fig. 8 is a horizontal section taken on the .
line 8-8 in Fig. 6. .
. » My improved ?replace heater comprises a self
contained ‘structure including a ?rebox member
a, 'an air heating jacket b surrounding‘, but spaced
'from said ?rebox‘; memben'and a face plate 0.
Said face plate extends across the space between
the airheating jacket and the ?rebox member
andis sealed tightly about the margin of the
open mouth of said ?rebox member. A sealing
"ringld is arranged internally of an inturned
flange 0-’ on the face plate and between them, a
recess is de?ned for receiving the forward edge
of'the ‘?rebox member, holding said. ?rebox mem
‘ber tightly in place in said face plate. Said ring,
?ange and the forward edge of the ?rebox mem 45
ber may be bolted, welded or otherwise secured
‘in place to form a strong rigid structure.
' The'marg'in’al edges of the ‘air heating jacket
also terminate in a laterally projecting ?ange b’,
extending outwardly from said jacket and ‘paral
lel to but spaced from the face plate.
ally projecting marginal ?ange b2, extending
fans are arranged in said two ?ues and upon a V away'from said face plate.
.55
shaft common to said ?ue fans, is a circulating
The ex
treme edge of said ?ange terminates in a later—
The face plate also
has a ‘marginal ?ange 02 extending parallel to
2,131,763
2
but spaced from the marginal ?ange 122. Under
lying the space thus formed is a marginal angle
element e preferably welded or otherwise secured
to the face plate and to the ?ange of the jacket
and a square recess is thus formed facing to
wards the front f’ of the masonry ?replace f.
In said recess I preferably provide a resilient
sealing element 9 of generous cross section com
posed preferably of material similar to resilient
10 fabric, corded asbestos or sponge rubber. Nor
mally said sealing element extends outwardly
from the recess and is compressed into said re
cess only under the in?uence of a substantial
pressure.
As is indicated in Fig. 1, the center of mass
of said self-contained heater is arranged at the
point marked X in said ?gure. Thus it extends
rearwardly a substantial distance behind the face
plate. Said heating device is supported in a ?re
20 place opening ]‘2 only along the bottom of the
face plate.
Thus, the off balance mass tends to
tip the ?replace heater more deeply into the ?re
place opening than to which it is set. It is re
sisted in said tipping by the engagement of the
marginal edges of the face plate 6 with the front
of the ?replace. Said tipping effect of the mass
of said heater tends to compress the sealing ele
ment 9 and said sealing element tends to prevent
said heating device from marring the highly
?nished front of a ?replace. Most ?replace fronts
are made of brick or tile and their joints present
an uneven surface. The resiliency of the seal
ing element tends to cause it to move into the
irregularities to give
of being solidly and
tire ?replace front.
has its function of
gases from passing
the ?replace front the effect
exactly ?tted along the en
Said sealing element g also
sealing to prevent the ?ue
upwardly between the face
of the ?replace heater and the front of the ?re
place.
The ?rebox member is closed top, bottom, at
each side and in the back. The front is open
into a room to be heated. I preferably provide
a pair of ?ues h extending upwardly from the
sides of the interior of the ?rebox. These are
arranged as far towards the side as is possible to
leave a space 712 between them. Lying in said
space is a cupped recess h3 which ?ts more or
the chamber between the air heating jacket and
the ?rebox member. The fans k are housed
within a rounded portion M in each of the ?ues.
The two ?ue fans k and the circulating fan i are
carried by a common shaft Z. The ?ue fans are
positioned and arranged, as is shown in Figure 5,
so that the ascending ?ue gases strike the blades
of the fan and tend to rotate them.
This gives
rotation to the circulating fan i to produce forced
draft of heated air, as will hereinafter be de 10
scribed.
The passageway for air to be heated is located
between the exterior of the ?rebox member a
and the interior of the air heating jacket 1). Ar
ranged inwardly of said jacket is a heat re?ector
m of curved shape and preferably having a highly
polished surface. I preferably make said heat
re?ector of stainless steel or similar material and
?nd that said device improves the efficiency of the
heater. Said heat re?ector extends from ad
jacent the ?oor of the air heating jacket up the
back thereof and along the roof overlying the
?rebox, but spaced therefrom. The space 722 be»
tween the ?ues forms a vent underlying the heat
re?ector, overlying the top of the ?rebox, and
closed at the sides by the opposed faces of the
?ues. I have observed that the point of greatest
heat is located here and the air ?owing across the
top of the ?rebox thru said vent is heated to the
greatest degree. To obtain forced draft along
said vent, the circulating fan i extends across the
entire width of said vent but not the heighth
thereof. Said fan serves to increase the quantity
and rate of ?ow of air thru said vent substantially.
15
20
25
30
That is, the rise in heat thru the passageway in
35
side of the jacket due to progressively greater
heat in the upper portions of said jacket produces
a thermal ?ow of air which is supplemented by
the driven-fan.
Two intake apertures n extend thru the face
plate 0 at the sides of the ?rebox opening. Said
apertures preferably are covered by grill work or
louvers. The air ?owing therethru passes along
the side of the ?rebox within the air heating jacket
and then passes inwardly over the back and top
of said ?rebox member thru the vent previously
described. A discharge aperture 0 extends sub
stantially across the entire face plate over the
opening. As can be seen in Figures 5 I‘
less closely about the path described by the tips -?rebox
and '7 most clearly, the face plate is cupped so‘
of the blades of a circulating fan 2' seated therein.
as to extend outwardly from its point of joinder
The ?oor a’ of the ?rebox member is provided
with draft apertures a2 preferably arranged only with the ?ange b of the jacket. Thus, lying be
tween said face plate and said ?ange c is a
along the forward edge thereof. I preferably ar
marginal auxiliary chamber 1) into which the in
range a grate a‘ or fuel container in said ?rebox
take apertures n open and from which the dis
with
the
forward
edge
just
inside
said
draft
aper
55
charge apertures permit the heated air to ?ow.
tures. Thus, fuel located in said grate is per
As is diagrammatically illustrated in Figure 2,
mitted to burn with the air ?owing inwardly thru
my improved ?replace heater is adapted to be
the mouth of the ?rebox member and supple
in ?replace openings differing substan
mented by the air ?owing upwardly thru the said mounted
tially
in
width
and heighth. As is shown in dot 60
draft apertures a2 in the ?oor or the ?rebox ‘
ted lines, said ?replace heater can be arranged
member.
Underlying the apertures in the bottom of the in ?replace openings varying in width from 2
?re-box is a retractable tray q constituting an ash
lil
receiver. Said tray is reciprocally mounted be
tween two opposed slides‘ 1'. When the tray is
seated tightly against the front of the face plate
it effectively prevents air for supporting com
bustion from ?owing upwardly thru the aper
tures a2. If said tray is withdrawn slightly, an
auxiliary draft is provided for increasing the ?ow
of air upwardly thru said apertures.
In Fig. 5 the ?ow of ?ue gases is diagram
matically illustrated. In each of said ?ues h is a
fan 70. Said fans are substantially larger in
diameter than the circulating fan 2‘ located in
to .22 and in height from y to y2. This is effected
by the relatively large difference in size of the
air heating jacket of my device with respect to 65
the marginal dimensions of the face plate there
of.
It is usual to have a substantial area about
the front of a ?replace below the mantle f3 there
of and between the sides f4 thereof. Thus, it is“
relatively unimportant how far over the marginal 70
edges of the face plate overlies the marginal
edges of the ?replace opening because of the
fact that my device is arranged with its mass
off center. Thus, the marginal edges of the face ,
plate will be held tightly in place independent‘
152,1333'763
‘ of‘ auxiliary i‘se‘curing'devices: ‘ "I'he‘jsealin‘g ele
ment 9 extending‘about the’rnar’ginal 5' edges ‘of
the face plate accommodatesslight irregularities
in the ?replace “front-and’ the ‘compression- = is
dependent upon the force applied."
'
‘
i "' '
‘My improved ?replace heater can be arranged
in a ?replace opening merely by pushing the lower
end inwardly until the marginal edges of the
face plate engage evenly about the face of the
10 ?replace. Thus, I have provided a heater of the
- circulating type which can be arranged in the
?replace out of the room proper and which will
be capable of producing circulating heat with
surprising efficiency. The ?ues are arranged to
15 aline with the chimney f5 of the ?replace f.
I claim:
.
1. A heater adapted to seat in a ?replace
opening,‘comprising a self-contained removable
unit including ‘an open mouthed ?rebox, an air
20 heating jacket surrounding and spaced from‘ said
?rebox and a face plate extending across the
mouth of said casing and seated about the open
mouth of said ?rebox and joiningsaid parts to
gether, the whole of said heater unit lying rear
wardly of said face plate, the ?rebox lying sub
stantially entirely within the ?rebox opening and
the mass of said unit being supported adjacent
the plane of said face plate and the center of
mass of said unit lying substantially rearwardly
30 of said plane, whereby said disposition of mass
exerts a substantial tipping moment about said
support to tend to cause said face plate to bear
tightly against the front of the ?replace.
2. A heater adapted to seat in a ?replace
opening, comprising a self-contained removable
unit including an open-mouthed ?rebox, an air
heating jacket surrounding and spaced from said
?rebox and a face plate extending across the
mouth of said casing and seated about the open
40 mouth of said ?rebox and joining’ said parts to
gether, the whole of said heater unit lying rear
wardly of said face plate, the ?rebox lying sub
stantially entirely within the ?rebox opening and
3
including ianlopen'niouth'ed ?rebox, an air heat
ing jacket surrounding ‘and spaced from said ?re
box and a faceplate extending across the‘ mouth
“of said casing and seated about the open mouth
"of said ?rebox and-joining said parts together, ‘
s’aid‘face‘" plate lhavingian intake aperture" and
an exhaust aperture overlying the intake aper
ture, both apertures extending into said jacket,
said face plate provided with laterally projecting
?ange portions adapted to extend beyond the 10
‘margins of said ?replace opening and to seat
against the front of said ?replace, the whole of
said heater unit lying rearwardly of said face
plate, the ?rebox lying substantially entirely
within the ?rebox opening and the mass of said 15
unit being supported adjacent the plane of said
face plate and the center of mass of said unit
lying substantially rearwardly of said plane,
whereby said disposition of mass exerts a sub
stantial tipping moment about said support to 20
tend to cause said face plate to bear tightly
against the front of the ?replace and a sealing
member extending about the face plate and
adapted to seat against the ?replace front under
said tipping force.
25
5. In a ?replace of the circulator type, a ?re
box having a ?ue extending upwardly, an air
heating jacket extending about said ?rebox in
cluding an upwardly projecting vent extending
over the top of said ?rebox and alongside said 30
?ue, an intake aperture entering the jacket at
the bottom and a discharge aperture communi
cating with the top thereof, and a curved heat
re?ector element arranged in said jacket spaced
from but facing said ?rebox, said re?ector ex
35
tending into and overlying said vent.
6. In a ?replace of the circulator type, a ?rebox '
having a'pair‘of laterally spaced ?ues extending
upwardly from adjacent the sides of the ?rebox,
an air heating jacket extending about said ?re
box and over the space between said two ?ues
including an upwardly projecting vent extending
over the top of said ?rebox and between the ?ues
‘the mass of said unit being supported adjacent ‘ therefor, an intake aperture entering the jacket
the
plane
of
said
face
plate
and
the
center
of
45
at the bottom and a discharge aperture com 45
mass of said unit lying substantially rearwardly
>municating with the top thereof. 7
of said plane, whereby said disposition of mass
'7. In a ?replacev of the circulator type a ?rebox
exerts a substantial tipping moment about said‘ having a ?ue extending upwardly, an air heating
support to tend to cause said face plate to bear jacket extending about said ?rebox including an
tightly against the front of the ?replace, a seal ' upwardly projecting vent extending over the top
:50 ing
member extending about the face plate and of said ?rebox and alongside said ?ue, fan mem
adapted to seat against the ?replace front under bers'located upon a common shaft, one extend
said tipping force,
.
‘ >
ing across said vent and another across said ?ue,
3. A heater adapted to seat in a ?replace open
said ?ue fan positioned to be rotated by the gases
55 ing, comprising a self-contained removable unit passing up said ?ue and to correspondingly ro
‘including an open-mouthed ?rebox, an air heat
tate the vent fan to tend to force the movement
ing jacket surrounding and. spaced from said ?re
of air thru the ventfan intake aperture entering
box and a face plateextending across the mouth the jacket at the bottom'and a discharge aper~
‘ of said casing and seated about the open mouth
60 of said ?rebox and joining said parts together,‘
ture communicating with the top thereof.
.
8. In a ?replace of the circulator type a ?rebox 60
the whole of said heater unit lying rearwardly
of said face plate, the ?rebox lying substantially
entirely within the ?rebox opening and the mass
of said unit being supported adjacent the'plane
having a pair of laterally spaced ?ues extending
upwardly, an air heating jacket extending about
said ?rebox including an upwardly projecting
of said face plate and the center of mass of said
between, the ?ues therefor, fan members located 65
unit lying substantially rearwardly of said plane,
whereby said disposition of mass exerts a sub
stantial tipping moment about said support to
tend to cause said face plate to bear tightly
70 against the front of the ?replace, a resilient seal
ing memberextending about the faceplate, and
adapted to seat against the ?replace front and to‘
be compressed by said tipping force.
'4. A heater adapted to seat in a ?replace open
ing, comprising a self-contained removable unit
vent extending over the top of said ?rebox and
upon a common shaft, one extending across said
vent and another across each of said ?ues, said
?ue fans positioned to be rotated by the gases
passing up said ?ues and to correspondingly ro
tate the vent fans to tend to force the movement 70
of air thru the vent, an intake aperture entering
the jacket at the bottom and a discharge aperture
communicating with the top thereof.
-
9. In a ?replace of the circulator type a ?re
box having a ?ue extending upwardly, an air 75
4
2,131,768
heating jacket extending about said ?rebox in
cluding an upwardly projecting vent extending
over the top of said ?rebox and alongside said
?ue, an intake aperture entering the jacket at
the bottom and a discharge aperture communi
cating with the top thereof, said discharge aper
.ture substantially overlying the full width of the
'?rebox, and a curved heat re?ector element ar
ranged in said jacket spaced from but facing said
?rebox, said re?ector extending into and over
lying said vent.
PAUL H. SROAT.
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