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Патент USA US2408993

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e. E. MUMMA
WARM AIR FURNACE
Filed April 28, 1941
'
5 Sheets-Sheet 1
Wat.
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2,408,991
G. E. MUMMA ’
WARM AIR FURNACE
5 Sheets-Sheet 2
Filed April 28, 1941
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BY
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Oct. 8, 1946.
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e. a. MUMMA
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2,408,991
WARM AIR FURNACE
Filed April 28, '1941
5 Sheets-Sheet 3‘
Oct. 8, 1946. '
s. E; MUMMA
2,408,991 '
WARM AIR FURNACE
Filed April 28, 1941
5 Sheets-Sheet 4
J“ilI[-‘.zlQi-fM.lT
INVENTOR.
600/’ 2/1-
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G. E. MUM-MA
WARM AIR FURNACE
2,408,991
'
Filed April 28, 1941
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5 Sheets-Sheet 5
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Patented Oct. 8, 1946
‘ 2,408,991
UNITED STATES PATENT OFFICE
2,408,991
WARM AIR FURNACE
George E. Mumma, Winnetka, Ill., assignor to
Sears, Roebuck and 00., Chicago, 111., a cor
poration of New York
Application April 28, 1941, Serial No. 390,713
2 Claims. (Cl. 126—99)
1
2
Fig. 16 is an enlarged fragmentary perspective
detail of a juncture ring shown in Fig. 12;
My invention relates to warm air heaters, and
has to do more particularly with a sectional heat
Fig. 17 is a similar view of a side wall liner
ing device.
I realize that sectional heating devices have
heretofore been suggested, as shown for example
forming a part of my invention; and
Fig. 18 is a similar view of the rear cover shown
in Fig. 14 and showing detached from the cover
a liner associated therewith.
It will be understood that the device shown in
the drawings may be constructed either as a hot
in Richardson Patent 1,072,499, September 3,.
1913; Allington 1,723,716, August 6, 1929; West
wick 2,157,643, May 9, 1939, and others.
However, I have evolved what appears to be a
air furnace or as a circulating stove, the differ
novel construction for a device of the type referred 1O ence being principally one of size and proportion,
to, which I believe to have certain marked ad
in either event being surrounded by a casing
vantages over any device of this type heretofore
through which air circulates in a manner well
known.
known in the art. The drawings show only the
Particular objects of my invention are to pro
heating element itself which serves to transfer ’
vide a sectional warm air heater which may be 15 heat to the air circulated around it, the outer
constructed either as a furnace or as a circulating
shell or casing being omitted for convenience
of illustration.
stove, which is especially simple in design, which
is economical to fabricate, which provides in
creased heat exchange efficiency, and which, in
general, is thoroughly satisfactory for the pur
The numeral iii indicates a front cover section
which may conveniently be provided with a ?re
door II for the introduction of solid fuel, and
a suitable forward extension [2 may be provided
for this purpose, if desired (Fig. 3). It will be
understood, however, that my invention is not
limited to a hand stoking device but may, if
poses desired.
Other objects and advantages will, no doubt,
suggest themselves to those skilled in the art as
the description proceeds.
Referring now to the drawings forming a part
desired, be adapted for automatic stoking and
of this speci?cation and illustrating a preferred
embodiment of my invention:
even for gaseous and liquid fuels. The front cover
section may also be provided with an extension
15 which is provided with a door 16 for the ash
'
Fig. 1 is a front elevation, partly in section, of a
heating device embodying my invention;
Fig. 2 is a detail elevation of the lower extremity
pit. Suitable draft opening is provided for, as at
H, with a closure therefor, such as damper l8
of the shaker handle;
Fig. 3 is a sectional view taken substantially
along the line 3-3 of Fig. 1;
Fig. 4 is a fragmentary perspective view show
ing an end of a grate bar section;
Fig. 5 is a perspective view of a grate shaker
arm;
Fig. 6 is a vertical sectional view of an inter
mediate section along the line 6-6 of Fig. 3;
Figs. 7 and 8 are sectional views taken sub
stantially along the lines 'l——‘| and 8-—8, respec
tively, of Fig. 3;
A rear cover sectionz? is also provided (Fig.
14).
35
.
Intermediate the front section 10 and rear sec
tion 20, I provide a plurality of duplicate sec
tions 25. Any desired number of these inter
mediate sections may be employed, depending
upon the heating capacity desired. Referring
to Figs. 6 and 15, it will be seen that each of the
intermediate sections includes a vertically elon
gated and laterally restricted chamber 26 which
includes the ash pit portion 21, fire box portion
Fig. 9 is a plan view of a front closure element
for the foremost exhaust ?ue section;
pivoted on pintles I9.
,
Fig. 10 is an elevational view of the front cover;
Fig. 11 is a plan view of a juncture ring;
Fig. 12 is an elevational view of a juncture ele
28, and a restricted gas portion 29, Fig. 6. The
45 shape as illustrated in Fig. 6 is found very advan
tageous in promoting rapid travel of combustion
gases and efficient contact thereof with the sur‘
faces. Improved combustion is also facilitated by
this shape. There is also effected a saving of
ment forming a part of the main ?re box;
Fig. 13 is a plan view of the rear ?ue connecting 50 metal. Above the ?re box portion 28 it will be
Fig. 14 is an elevation of the rear closure ele
seen that the section becomes extended or ?ared
in width and narrower from front to rear, to pro
ment for the ?re box;
Fig. 15 is an elevational view of one of the inter
mediate sections shown in Fig. 6;
55 ferred to generally by the numeral 3% (Fig. '7).
element;
vide a scutiform pouch 30 for gaseous products of
combustion, this upper pouch portion being re
2,408,991
4
Elongated ports 3| permit the passage of gases
6| engaging behind the hooks 58. These liners
of combustion from the ?re box 28 into the ?ared
6B are formed of ceramic material, a heat re
section 30, baffles 33 being provided in order to
sistant alloy or other suitable heat resistant ma
force these gases into contact with the outer walls
terial to protect the device from the very hot gases
of the section. The gases flow out of the enlarged In of combustion immediately above the fire bed. A
section 39 through slots 35 into a manifold 35,
suitable liner 62 is provided for the rear section
passing out through a flue extension Iii (Fig. 3)
29, which has formed on the inside thereof a suit
in the rear of the device.
'
able socket-like element 63 (Fig. 18) for retain
The ?ared section 35 is provided with an arcuate
' ing the former, and a similar liner 64 (Fig. 8) is
slot 39 below the manifold 35, which permits
attached to the front cover section is above the
transverse passage of air through the flared sec
grate. It will be noted from Fig. 8 that the liners
tion 3!}, providing a large surface for heat ex~
60, B2 and 64 are vertically corrugated and are
change. t will be noted that the slots 35) follow
spaced from the inner walls of the furnace. These
the contour of the top of the combustion ch. ..
liners thus serve not only to protect the walls from
ber, thus providing a heat exchange surface at th
overheating and possible disintegration but also
hottest portion of the chamber; also that the slot
provide vertical passages whereby air streams may
is sloped so as to inhibit collection of dust. soot
and fly ash, which would act as an insulator.
Thus, it will be seen that each ?ared pouch
section serves as a heat exchange ?n. Not only
is a very great surface provided by the arrange
ment shown, but also, by narrowing the flared
sections, the velocity of the gases is increased,
adding further to efficiency.
Each flared section 30 is provided on each side
thereof with openings which are closed by means
flow from the lower portion of the furnace, heated,
and continue into the upper portion, thus pro
viding preheated secondary air for combustion of
the gases distilled from the fuel bed, thus greatly
adding to the efficiency of the device. The liners
may, if desired, extend below the grate, in which
case they will receive air rising from the ash pit
along the sides of the grate and discharge it at
the top of the liners.
Juncture rings 65 (Figs. 3 and 11) similar in
cross section and in function to the elements 55
of doors 4!), suitable packing, such as asbestos
rope, being provided around the edges of the
are provided in the upper or manifold portion of
doors. These doors are provided with ‘nook-like
the device, circular ribs 66 being formed on the
portions 4! (Fig. 6) which engage studs 42 or
?ared portion 36 of intermediate sections 25 to
the like formed on the inside wall of the ?ared
seat in said rings 65.
portion 30. A lip 43 or the like may be provided
The grate is likewise formed in a plurality of
on the outside of the doors 43 whereby they may
sections 70, one grate section being provided for
be engaged by a suitable tool and removed for
each of the intermediate sections 25. As best seen
cleaning out any soot, fly ash, or the like which
in Fig. 4, each grate bar has formed on each end
might collect in the passages of flared portion
thereof a U-shaped outwardly extending hanger
39. However, it should be noted that by reason
flange ‘H which is rotatably seated on a bearing
of the downwardly sloping walls 45 of the por
stud 12 extending inwardly from the wall of the
tion 3!], which slope down preferably at an angle
section 25 and preferably formed integrally there
of at least 45°, fly ash will tend to drop by gravity 40 with (Fig. 6). Each grate section 19 is thus sup
out of these passages and hence will not readily
ported at each end thereof. At one end shaking
collect so as to reduce heat exchange efficiency.
means is provided in the form of a shaker arm
Such collection is also minimized by the turbu
73 (Figs. 3 and 5) which has a stirrup-like por
lence currents produced by the bailles and by the
tion 15 encompassing the U-?ange ‘H of the grate.
restricted width of the ?ared portion 38, produc
ing high velocity of gases. Hence, cleaning will
be only infrequently required.
The manifold 36 is closed at the front by means
of a plate 48 (Figs. 1, 3 and 9) which is provided
with cars 49, 49', through which extend tie rods
50 and 50’, the front cover It! also having an
upstanding ear £59" opposing car 49'. Similar
ears 49a, 492). are provided on the ?ue section 37
through which the tie rods pass, while the rear
cover section 25 has an car 490 opposing ear 491‘).
Additional tie rods 5| are provided on each side
'I'he stirrup 15 is made only slightly larger than
the ?ange "H so as to form a relatively snug ?t
therewith, whereby rotation of each shaker arm
rotates its corresponding grate section with sub
stantially no play. Each shaker arm has a de
pending bar 16 which carries adjacent its free end
a stud 11 which is journalled in an eye portion
‘E8 of a grate connecting bar 80 (Fig. 3). The bar
80 is suitably connected to a shaker lever 82 dis
posed in a convenient position to one side of the
CLI .Vi front cover section I0, and journalled thereto as
of the portion 28, suitable cars 52 being provided
at 83', and having a depending arm 84 pivotally
secured to the connecting bar 89 as at 85.
thereat on the front cover section It] and rear
cover section 20. Of course, the tie rods may be
tionally advantageous arrangement.
disposed at other suitable points, such as inside
the furnace in addition to or instead of at the
points shown.
Between adjacent sections 25 are provided junc
ture or sealing sections 55 (Figs. 3, 7, 8, 12 and
16). These sections 55 are of H cross section,
each having a groove 56, Fig. 16, on each side
thereof which receives the edge of the adjacent
intermediate section 25, rope asbestos or other
suitable gasket material being disposed in the
grooves to provide a gas tight joint.
On the inner ?ange of each of the juncture
sections 55 I provide a cut out portion 5'! adjacent
which is an upstanding hook-like portion 58 for
It will be seen that I have provided an excep
Substan
tially the entire organization may be cast, thus
contributing greatly to low cost. A heater may
be made of any desired capacity merely by pro
viding the desired number of sections 25 and junc
ture elements. After a unit has been set up, if
7 any change in capacity is desired, it is only neces
sary to remove the tie rods and add or remove
the necessary number of intermediate sections
and juncture elements. Assembly and demount
ing is done very rapidly and conveniently, in
- view of the interlocking arrangement and tie
rods. The front and rear sections may be inter
changed without disturbing the rest of the or
ganization.
retaining liners 69 (Figs. 3, 6, 8 and 17), the
heat efficiency is also found to be greater
latter being provided with laterally extending ears 75 as The
compared with similar devices heretofore
2,408,991
,
known. Thus, I have found from tests that by
reason of the large amount of heat exchange sur
face provided, according to my design, a saving
of metal amounting to as high as 35 per cent may
be e?ected for a given heat output, as compared
with standard cast iron warm air furnaces.
Metal may be saved by reason of the fact that
much thinner walled sections may be used than
6
fording accessibility to the interior of said pouch,
coextensive opposite walls joining with the several
of said narrower pouch de?ning edge-wall por
tions to form an enclosure constituting said
scutiform pouch, wall means de?ning an arched
transverse communication opening through said
coextensive walls and serving as a heat exchange
passageway, said coextensive opposite walls hav
ing also a circular flue duct over said arched
view of the fact that, according to my invention, 10 opening communicating with the interior of said
scutiform pouch, and fine deflecting ?ns extend
the products of combustion are carried away at
ing from said wall means and continuing the
such a great velocity that local overheating is
arched curvature of said opening within said
avoided. Where such heat would be at all likely
pouch for the purpose of deflecting ?ue gases
to occur, as adjacent the ?re bed, protective
is possible with previously known structures, in
liners are attached.
which rise from said ?re chamber into heat ex
Various modi?cations may suggest them
selves to those skilled in the art Without depart
ing from the spirit of my invention, and, hence, I
do not wish to be restricted to the speci?c form
edge-wall portions.
changing lapping engagement with said ?aring
2. A section furnace component for tandem
multiple assembly comprising an integral casting
shown or uses mentioned, except to the extent 20 having ?re chamber and ash pit de?ning wall sec
indicated in the appended claims.
I claim:
1. In a heater apparatus, a plurality of similar
component sections of which each comprises an
integral casting designed for tandem assembly,
each of said component sections including a low
ermost portion having a horizontal bottom edge
wall and a pair of opposite side edge-walls, said
bottom and side edge-walls pro?ling correspond
ingly and proportionally an ash pit chamber and
a fire chamber and including a junction-de?ning
edging for abutment with the corresponding
edging of adjacent component sections, reverse
curve portions merging into the upper extremity
of said side edge-walls and extending inwardly to
form a Slight constriction thereat with edging
flanges meeting centrally and de?ning an arch,
relatively narrower side edge-wall portions merg
ing with said reverse curve portions and ?aring
outwardly to extend beyond said opposite side
edge-wall of said lowermost portion, thence ex
tending vertically, and thereafter joining‘ with a
horizontal plane edge-wall portion to accordingly
de?ne the perimeter of a scutiform pouch, the
vertical portions of said relatively narrower edge
wall having opposite cleanout openings for af
tions at opposite sides and bottom of substan
tially rectangular outline, said wall sections curv
ing at the upper extremity of the sides inwardly
into a constriction and arch de?ning outline, rel
atively narrower edge-wall portions merging with
said wall section at the region of said constriction
and angling outwardly thence vertically and join
ing with a horizontal-plane narrower edge-wall
portion to accordingly de?ne the perimeter of a
scutiiorm pouch, coextensive opposite walls
joining with said narrower edge-wall portions to
enclose said scutiform pouch, wall means extend
transversely through said coextensive oppo
site walls and de?ning an arched transverse com
munication opening therethrough for serving as
a heat exchange passageway, said opposite walls
also having a circular flue duct opening over said
arched opening by communicating with said
pouch, and flue gas deflecting means extending
within said pouch and abutting opposite ends of
said arched opening wall means to effect wiping
contactual engagement outwardly of flue gases
rising within said pouch from the region of said
?re chamber.
GEORGE E. lVIUlVEMA.
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