Improvements in Stoves.
Year: 1895

page_text: Date of Application, 29th Mar., 1895-Accepted, 22nd June, 1895
COMPLETE SPECIFICATION.
Improvements in Stoves.
I, KARL KREBS, Engineer of Hüsten near Neheim in the Province of
Westphalia and Kingdom of Prussia, 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 present invention concerns a heating apparatus, with smoke-consuming
firing, which in comparison to the constructions hitherto in use and answering the
same purpose, has among others the advantage that any kind of fuel may be equally
well burned in it.
The annexed drawing shows in Fig. 1 in longitudinal section, as well as in
Figs. 2 & 3 in sections to a-y and vw a stove of the newest construction, which in
order to simplify matters, is drawn as a round stove, while it goes without saying
that the shape and size as well as the form of heating-apparatus may vary
according to the different circumstances that are to be considered in each separate
case.
The stove consists essentially of the exterior stove-mantle A, containing in its
lower part the fire-place with a grate a, which varies according to the kind of fuel
chosen, as well as the charging-funnel band the ash-pit c, in its upper part the
outlets for the fire-gases to the chimney and the inner cylinder B, which is
supported on the cylinder A. by means of the flanges de.
The lower part of the inner cylinder B forms the actual fire-place and is formed
by a third cylinder B₁, the inner space of which is in connection by means of four
horizontal canals with the space Clying between the chief cylinder-mantles A
and B₁.
Between every pair of these horizontal canals there is situated a vertical canal
(Fig. 3) through which the flame arrives from the fire-place into the upper space
of B. From here it passes through the opening (Figs. 1 and 2) into the space
between the cylinders A and B, and as this space, as will be seen from Figs. 1
and 2, is divided by two diametrically opposite partition-walls ss into a front
chamber and a hinder chamber i, first of all it ascends in the front chamber i
and descends over the partition-walls in the hinder chamber ₁ down into the
chimney.
In order to supply the necessary air for the attainment of a complete combustion,
two different air-supplying canals are provided. The first of these canals is obtained
by a circle of openings k, which can be simultaneously shut or opened by a common
slide, being arranged in the outer mantle of the stove at the spot, where it shuts
off the space C. The air passes through these openings k into the fire-place.
In the second case the air enters from above into the inner cylinder B, and at the
lower end of the same through an opening o, as well as through the round
openings m situated in the horizontal shut-off plate d between the spaces i, and C,
which are also simultaneously shut or opened by a slide into the fire-place.
By means of the arrangement, which we have just described, a perfectly smokeless
combustion may be attained with any kind of fuel.
After the fuel has been formed in and the fire, which is supplied with the
necessary air by the grate, has been lighted, the openings m are closed, the
openings k on the contrary opened. The fire-gases then enter in the direction of
the arrows marked o through the canals g into the upper chamber of B₁, heating
thereby the walls of the cylinder B, and here join the air entering in the direction

page_text: of the arrows
and considerably beated in passing the cylinder-walls, which
already causes a pretty smokeless combustion to take place. From B₁ the hot
gases enter through the opening h into the space i and pass in the direction of the
arrows into the chimney, on their way making the walls of the inner cylinder
red-hot. When the fire is burning thoroughly, one closes the openings and
opens m. The air then enters from above into the red-hot cylinder, and being
already beated to a great heat moves on in the afore-mentioned way in the direction
until it joins the fire-gases, whereby a complete combustion
of the arrows
is effected.
As has already been stated, the heating-apparatus, constructed in this manner,
can be applied for every kind of fuel, while hitherto in the so-called American
stoves only anthracite could be burnt. In consequence of the complete combustion
a great saving in fuel is also effected by this kind of stove.
At the same time the stove, in consequence of the arrangement of the air-passages
acts as an excellent room-ventilator.
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:
Heating apparatus in which by means of the supply of previously heated air to
the gases of combustion a complete smokeless combustion is effected, distinguished
by the combustion-chamber B₁-separated from the fire-place-in which the gases
of combustion coming from the fire-place, are mixed with the air which is previously
suitably heated.
Dated this 23rd day of March 1895
For KARL KREBS
Bernh. Brockhues.