Improvements in Gas Fired Furnaces.
Year: 1893

page_text: Date of Application, 25th July, 1893
Complete Specification Left, 4th Apr., 1894-Accepted, 16th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Gas Fired Furnaces.
I, DANIEL KEGLER, of Mannheim, Germany, Manufacturer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to gas fired furnaces and is designed to effect a better
preliminary heating of the air introduced to the burners and to improve the
construction of the furnaces so as to render them easier of erection and more
durable.
Experiments have shown that, at high temperatures it is advantageous to let the
entering air pass around the outside of the furnace and to let the gases of
combustion pass directly behind the wall of the chamber of combustion. If the
lining of the inner chamber be properly arranged, it will be very well capable of
withstanding the increased heat so produced.
The furnace is constructed so that the gases do not only come into direct contact
with its sides but that they also heat the top and bottom in the same manner,
while the fresh air passing on the outside prevents or counteracts the external
escape of the heat.
In this manner it is possible to heat a furnace of one cubic meter outside
measurement to a temperature of from 800° to 1200° centigrade by varying the
supply of gas, while leaving the outside temperature so as not to inconvenience in
the least any person near the furnace.
The furnace is constructed of several cast iron plates which freely engage with
one another by grooves etc., thus allowing for expansion by heat. The construction
is preferably carried out so that the vertical side walls are held by grooves in the
horizontal plates and in the front and back plates while the front and back plates
and the horizontal plates are supported by fire bricks.
It is therefore rendered possible to erect the furnace in very short time and
without skilled operatives.
Double bottoms are formed which are preferably kept apart by pieces which
also engage into grooves.
The inner chamber is formed by the brickwork, the ceiling being perforated for
the escape of the products of combustion, while openings in the bottom receive the
burners at the side of which the air enters for combustion. The front of the
chamber is closed by a sliding door.
The products of combustion pass through the openings, then above the ceiling
and around the back walls and the sides of the chamber, and enter at the front
into the double bottom of the chamber in which they pass again backwards to the
exit in the flue. In this manner the inner chamber is surrounded on five sides by
the gases of combustion, and this is the principal cause of the production of a
temperature such as has not been obtained before in so small a space by ordinary
burners.
The outside air necessary for complete combustion of the gases and for cooling of
the outside, enters by means of openings between the walls and passes between the
walls and being warmed on the hot wall enters below the hot double bottom;
passes through the round openings in the latter and escapes around the burners to
pass direct into the flame.
In connection with the furnace I use an improved form of burner the improve-
ment of which is that the mouth piece and its annular ring are made of porcelain
so as to be able to better withstand the heat.
If at the commencement of heating, which takes about three quarters of an

page_text: hour, there should not be the draught required to draw in the air from above
through the openings, the sliding door is opened and the air enters therethrough.
This 15th don of Lul 1803
FELL & WILDING,
Agents for the Applicant.
שע-U
Improvements in Gas Fired Furnaces.
I, DANIEL KEGLER, of Mannheim, 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 gas fired furnaces and is designed to effect a better
preliminary heating of the air introduced to the burners, and to improve the
construction of the furnaces, so as to render them easier of erection and more
durable.
Experiments have shewn that, at high temperature, it is advantageous to let the
entering air pass around the outside of the furnace, and to let the gases of com-
bustion pass directly behind the wall of the chamber of combustion. If the lining
of the inner chamber he properly arranged, it will be very well capable of
withstanding the increased heat so produced.
The furnace is constructed so that the gases do not only come into direct contact
with its sides, but that they also heat the top and bottom in the same manner,
while the fresh air passing on the outside prevents or counteracts the external
escape of the heat.
In this manner it is possible to heat a furnace of one cubic meter outside
measurement to a temperature of from 800° to 1200 centigrade by varying the
supply of gas, while leaving the outside temperature so as not to inconvenience
in the least any person near the furnace.
The furnace is constructed of several cast iron plates which freely engage with
one another by grooves etc., thus allowing for expansion by heat. The con-
struction is preferably carried out so that the vertical side walls are held by grooves
in the horizontal plates and in the front and back plates, while the frout and back
plates and the horizontal plates are supported by through-bolts or rods.
It is therefore rendered possible to erect the furnace in very short time and
without skilled operatives.
Double bottoms are formed which are preferably kept apart by picccs which also
engage into grooves.
In order that my invention may be the better understood I now proceed to
describe the same with reference to the accompanying drawings and to the letters
and figures marked thereon.
Like letters refer to like parts in the various figures.
The inner
Figures 1, 2, 3 and 4 shew this novel furnace in various sections.
chamber A is formed by the brickwork B, the ceiling being perforated for the
escape of the products of combustion while openings in the bottom receive the
burners V at the side of which the air enters for combustion. The front of
the chamber is closed by a sliding door.
The products of combustion pass through the openings M then above the ceiling,
and around the back walls B' and the sides B. B. of the chamber and enter at
the front into the double bottom C of the chamber A in which they pass again
backwards to the exit H in the flue K. In this manner the inner chamber is
surrounded on five sides by the gases of combustion, and this is the principal
cause of the production of a temperature such as has not been obtained before
in so small a space by ordinary burners.

page_text: The outside air necessary for complete combustion of the gases and for cooling
of the outside, enters by means of openings 0 between the walls C & D passes
between the walls C and D (being warmed on the hot wall C) enters below the
hot double bottom G passes through the round openings in the latter Z which have
restricted necks to lead the entering air direct into the flame and escapes around
the burners to pass direct into the flame.
Figures 5 and 6 show an improved form of burner, the advantage of which is the
arrangement of tubes one within another and that the mouth-piece Q and the
annular ring P, are made of porcelain so as to be able to better withstand
the heat.
If at the commencement of heating, which takes about three quarters of an hour
there should not be the draught required to draw in the air from above through the
openings O the sliding door L is opened and the air enters therethrough.
As shown in the drawings, the construction of the furnace is very simple so that
it can be easily erected anywhere and taken to pieces without trouble. The
furnace consists of cast iron plates held together by grooves and through-bolts r
and lined with fire proof bricks.
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. A gas furnace in which the gases of combustion pass directly around the fire
proof wall of the chamber of combustion, through the double bottom of the latter,
while the outside air required for the combustion enters through the outermost
mantle of the oven and through the openings of the bottom of the chamber of
combustion in which the gas burners are arranged substantially as described.
2. A furnace as claimed in Claim 1 in which the gases escape at the top of the
heating chamber and pass along the chamber wall downwards, and enter at the
front into the double bottom, and then pass at the back through a pipe through
the cold air space into the flue substantially as described.
3. The special construction of the furnace in which the same is constructed of
several iron plates engaging at their rims by means of grooves or similar connec-
tions, kept in place by means of rods & screws holding the fire-proof chamber
together substantially as described.
4. The arrangement of a sliding door L at the lower air supply service, for the
alternative supply of air, substantially as described.
5. The arrangement of "inserting pieces" Z narrowed in the middle, between
the double bottoms of the heating chamber in order to lead the entering air direct
into the flame of the burners.
6. The construction of a burner head of the described form, consisting of several
tubes placed within one another, and composed, as to the mouth piece and ring, of
porcelain.
Dated this 4th day of Anril 1894
FELL & WILDING,
Agents for the Applicant.