An Improved Furnace.
Year: 1894

page_text: Date of Application, 10th Apr., 1894
Complete Specification Left, 20th Nov., 1894-4ccented, 22nd Dec., 1894
An Improved Furnace.
1, DANIEL KEGLER, of The Deutsche Patent-Emaillir und Glühofen-Fabrik,
Mannheim, in the Empire of Germany, Manufacturer, do hereby declare the
nature of this invention to be as follows:-
This invention relates to a heating annealing or muffle furnace in which coke is
used as fuel. This furnace is intended chiefly for enamelling, but it may be used
also for heating a great many articles produced at temperatures reaching 1200
degrees Centigrade.
The heating chamber consists as usual of refractory lining held in a frame.
of cast iron plates and behind this chamber is placed the furnace from which the
furnace gases enter the chamber through openings in the back-wall thereof and
pass out through openings in the side walls near the front into a surrounding
casing or flue from which they escape only after having circulated around the side,
walls, the bottom, and the top, of the said chamber. Air under pressure is supplied
at the top of an outer casing or flue which surrounds the inner casing, circulates
around the top, sides, and bottom, of the inner casing by which it is heated, and
enters a chamber from which it may be supplied under the control of valves either
beneath the fire-grate or through passages which lead into the opening in the
back-wall where it mixes with the furnace gases and ensures their complete
combustion.
Reference is to be had to the accompanying drawings, forming part of this
Specification, wherein Figures 1 and 2 represent vertical cross-sections, on
lines X-X, Y-Y, respectively, of Figure 3 which represents a horizontal section,
on line Z-Z, Figure 1.
The heating chamber is constructed of fire-clay slabs A', A', A³, A', which are
held together by iron plates B, B1, B2, B. The furnace is constructed of fire-clay
slabs supported by. the plates B', B', by the end and base plates B, and D. The
furnace gases enter the heating chamber through apertures O in the wall A', at
which point they are mixed with the heated air issuing from orifices p whereby
complete combustion is effected. A fire-clay baffle A', is placed opposite the
openings O whereby the gases are deflected against the top of the heating chamber,
part of them passing under the baffle A'. The latter also prevents particles of
coke which are carried along with the gases from flying about within the chamber
and becoming deposited on the articles placed in the oven.
The hot gases pass out through the opening b made near the front in the side
walls of the chamber into the inner flue surrounding the said chamber and enclosed
by the iron plates C', C1, C2, and C. The vertical partitions C³, divide the side
flues into two parts so that the hot gases entering the flue at the openings 6 pass
down through the openings b', into the bottom flue, thence horizontally into the
rear part of the side flues, and then upwards through the openings 63, into the top
flue, and then horizontally forward into the chimney G. The inner flue is sur-
rounded by the air heating inlet passages or flues enclosed between the casing of
the inner flues and the iron plates D', D', D', and D*, forming the outer casing.
The air blast entering at H passes as shewn by the arrows, through the outer top
flue, thence down the outer side flues, and through the openings c, into the outer
bottom flue, whence the now heated air passes through the openings e in the
plate E into the chamber enclosed by the plates F, B³, E, and D'. By opening

page_text: the regulator in the plate F the heated air can be admitted beneath the inclined
grate R and by opening .the regulator 9 it passes up air passage P and emerges
at the orifices p in the opening. O where it mixes with the heating gases.
water tank is placed under the grate.
A
I, DANIEL KEGLER, of The Deutsche Patent Emaillir und Glühofen Fabrik,
Mannheim, in the Empire of Germany, Manufacturer, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention relates to a heating annealing or muffle furnace in which coke is
used as fuel. This furnace is intended chiefly for enamelling, but it may be used
also for heating a great many articles produced at temperatures reaching 1200 degrees
Centigrade. The heating chamber consists, as usual, of refractory lining held
in a frame of cast iron plates and behind this chamber is placed the furnace
from which the furnace gases enter the chamber through openings in the back-
wall thereof and pass out through openings in the side walls near the front into a
surrounding casing or flue from which they escape only after having circulated
around the side walls, the bottom, and the top, of the said chamber. Air under
pressure is supplied at the top of an outer casing or flue which surrounds the
inner casing, circulates around the top, sides, and bottom, of the inner casing, by
which it is heated, and enters a chamber from which it may be supplied under
the control of valves either beneath the fire-grate or through passages which lead
into the opening in the back-wall where it mixes with the furnace gases and
ensures their complete combustion.
Reference is to be had to the drawings accompanying my Provisional Specifi-
cation, wherein Figures 1 and 2 represent vertical cross-sections, on lines X-X,
Y-Y, respectively, of Figure 3 which represents a horizontal section, on line Z-Z,
Figure 1.
The heating chamber is constructed of fire-clay slabs A', A³, A', A', which are
held together by iron plates B', B', B, B. The furnace is constructed of fire-
clay slabs supported by the plates B, B+, by the end and base plates B³, and D³.
The furnace gases enter the heating chamber through apertures O in the wall A',
at which point they are mixed with the heated air issuing from orifices p whereby
complete combustion is effected. A fire-clay baffle A is placed opposite the
openings whereby the gases are deflected against the top of the heating
chamber, part of them passing under the baffle A³. The latter also prevents
particles of coke which are carried along with the gases, from flying about within
The hot
the chamber and becoming deposited on the articles placed in the oven.
gases pass out through the opening b made near the front in the side walls of the
chamber into the inner flue surrounding the said chamber and enclosed by the iron
plates C, C, C, and C. The vertical partitions C' divide the side flues into two
parts so that the hot gases entering the flue at the openings b pass down through
the openings b', into the bottom flue, thence horizontally into the rear part of the
side flues, and then upwards through the openings & into the top flue, and then
horizontally forward into the chimney G. The inner flue is surrounded by the air-
heating inlet passages or flues enclosed between the casing of the inner flues and
i

page_text: he iron plates D', D¹, D', and D', forming the outer casing. The air blast
entering at H passes, as shewn by the arrows, through the outer top flue, thence
down the outer side flues, and through the openings c', into the outer bottom flue,
whence the now heated air passes through the openings e in the plate E into the
chamber enclosed by the plates F, B', E, and D'. By opening the regulator f
in the plate F, the heated air can be admitted beneath the inclined grate R and by
opening the regulator 9 it passes up air-passage P and emerges at the orifices
in the opening O where it mixes with the heating gases. A water tank is placed
under the grate.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of a muffle or heating chamber of fire-clay which is
constructed in a frame of iron plates with a coke furnace at the rear of the heating
chamber the walls of which are supported by the iron plates of the heating
chamber.
2. The arrangement of the muffle or heating furnace described in Claim 1,
wherein the air for combustion is caused to pass round the heating chamber or
a casing or flue surrounding it through which the escaping gases pass whereby
the air becomes heated and is then led partly under the grate and partly mixed
with the gases issuing from the coke furnace.
3. The special way of leading the gases of combustion through openings in the
back-wall of the furnace round about a baffle wall in the heating chamber in front
of the openings, then through openings near the front of the heating chamber into
the inner casing or flues and thence into the chimney.
4. The special arrangement of a vertical partition in the inner casing or flue at
each side so that the gases of combustion will pass downwards at the front part and
upwards at the rear part, as specified.
5. The leading of the pressure air coming in from the top round the inner casing
to a space under the heating chamber from which the air regulated by slides is
distributed to the grate and to channels in the furnace wall, as specified.
Dated this 20th day of November 1894.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.