An Improved Steam Heating Stove.
Year: 1889

page_text: Date of Application, 26th Nov., 1889-Accepted, 1st Mar., 1890
COMPLETE SPECIFICATION.
An Improved Steam Heating Stove.
I, EMIL LAEMMERHIRT of 48 Lathringer Strasse Berlin in the Empire of Germany,
Engineer 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 :-
The manner in which I carry my invention into effect is shewn in the accompanying
drawing of which fig. 1 is a sectional drawing of the entire apparatus while figs. 2, 3,
4 and 5 are variations and details.
The stove consists of an upper heating cylinder into which the steam enters and
condenses and of a lower part which comprises the fire box and the boiler in which the
steam is produced and also a water reservoir.
The heating cylinder consists of a central tube D through which the steam generated
in the boiler rises and whence it passes into the space D' where it condenses and drops
into the boiler again. Four large air tubes a draw cold air from below as indicated
by arrows and pass the air out again at top thus establishing a regular circulation
of air.
The lens-shaped boiler A can be removed by undoing the couplings with tubes D,
and d. It is provided with a trap-door r and a valve w.
B
The firing is by means of gas for which purpose I have constructed the following
combination.
The gas from the jet oo before entering the tube F becomes mixed with atmo-
spheric air entering through perforations ii, the mixture passing through tube F
and up into its extensions f. f. which is a ring formed tube like a round burner made
by bringing a tube 7 through its center, such tube / being the extension of another
tube L the object of which is principally to lead air direct to the flame at the outlet
offf; but it is also sometimes used as an extra burner for which purpose gas can
enter from the tap g through jet o and gets mixed with air i as before. When the
mixture passes through tube lit becomes naturally warmed and is therefore more
combustible. In order to prevent the burners from becoming clogged and dirty the
dust and soot chambers p p are provided. The air-inlets i and ii are formed from
downwardly pointed T pieces so that no dust can remain and no draught can cause
escape of gas fumes.
The air for the flame enters from underneath the stand passing along the corrugated
metal tube E being guided by plates P resting on supports s. The combustion fumes
pass outside the corrugated metal E being guided by plates T in order to utilize its
beat for heating the air passing upwards to the flame.
The fumes ultimately pass under the bridge H into the chimney (fig. 3) which is
provided with a water well R.
The water reservoir K which is connected with the boiler A by means of the tube d
with joint e placed either in or near the stand. uu is the overflow tube and s the
emptying tube with screw-plug.
The upper half of the reservoir cover may be folded back as shewn in dotted lines
in order to ascertain the state of the contents of water or similar purpose.
The reservoir is conveniently placed upon a balcony-like enlargement of the
principal foundation as shewn in fig. 5.
In fig. 2 a reservoir is shewn standing away from the stand, the tube d issuing from
the bottom.
The tube d, which acts simultaneously as feed, overflow tube for the boiler safety
tube and steam lock, is arranged at the bottom of the boiler in such a manner that
the upper tube opening is level with the normal water level.. The lower end of

page_text: the tube ends near the bottom of the water reservoir. The small round holes m in
tube d, near the bottom serve to enable the air driven off from the boiler, when first
heated, to escape noiselessly.
In fig. 2 similar openings in are made in the tube t passing upwards and downwards
and which is a continuation of the tube d. The other letters in this drawing indicate
similar parts as in fig. 1.
The stove is clad internally with clay and the like in order to prevent sweating
which would otherwise occur when first lighting up.
The draught regulation is done once for all with the tube corner valve Z in the
chimney (fig. 3).
The screw on the boiler closes the opening which serves for the first filling and
subsequent cleanings of the boiler.
The air and steam tap w on the boiler A may be used for removing the pressure in
the stove and also for keeping the air moist which for instance in case of greenhouses
may be found desirable.
The filling with water of reservoir and boiler is done through the trap r until it
flows out of u, the quantity necessary being about a gallon, which quantity suffices
for several months, and it is not necessary to refill until the small holes at m are
out of the water.
The gas fire may be regulated by means of the valve L on the gas-pipe fig. 4, and
such valve may be provided with figures corresponding to the exact quantity of gas
passing through every hour and at which the valve may be set.
The manner in which the stove works is as follows:
Water having been filled on' as described and the gas lit, the air is driven out
through the tube d, which may be noticed in the water reservoir K by air bubbles
issuing from the holes m, and after that the steam generation goes on quietly.
The water level regulates itself in the boiler. As soon as the heating under the
boiler is stopped, then all the steam condenses, air again enters through tube d and
the previous normal water-level is re-established.
A heating stove as described is quite dangerless, inasmuch as the formation of steam
takes place with the tube d opening into the water reservoir.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. A steam heating stove provided with a tube d for automatically regulating the a
water level in the boiler and which tube also acts as suction, overflow and safety tube
and as steam lock, all substantially in the manner as and for the purpose described
and shewn in the drawing.
2. In such steam heating stoves the arrangement of a lens shaped boiler consisting
of the bottom v, through which enters the tube d, and the columns B provided with
screw joints and which connect the boiler with the space D¹ all substantially in the
manner as and for the purpose described and as shewn in the drawings.
3. The arrangement of air escape holes m in the tube d substantially in the manner
as and for the purpose described and as shewn in the drawings.
4. The arrangement of a water reservoir K with overflow tube u, and when required,
as for instance in fig. 2 the lengthening of tube d into an up and down tube t like-
wise provided with air escape holes m substantially in the manner as and for the
purpose described and as shewn in the drawings.
5. The arrangement of burner Fff provided with an internal air supply tube Ll
in connection with dust and soot chamber p and arranged in such a manner that the.
tube LZ can also be used as a gas supply tube substantially in the manner as and for
the purpose described and as shewn in the drawings.
6. The arrangement of the corrugated tube E with supports S for plates P. to guide
the air, passing through space C, along the wall of E substantially in the manner as
and 'for the purpose described and as shewn in the drawings.

page_text: 7. The arrangement of the chimney with water well R and draught regulating
valve Z substantially in the manner as and for the purpose described and as shewn in
the drawings.
London the 26th day of No
11000
EMIL LAEMMERHIRT.
Per C. R. Bonne & Co,
41, Eastcheap, E.C., Registered Patent Agents.