Improvements in Stoves and Furnaces for Attaining a Smokeless Combustion and a High Temperature.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Stoves and Furnaces for Attaining a Smokeless
Combustion and a High Temperature.
I, AUGUST BURKART-STALDER, Manufacturer, residing at Berne in the
Republic of Switzerland, 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 for improvements in stoves and furnaces for attaining a smoke-
less combustion and a high temperature has for its object to provide an apparatus
which may be fitted to any fire place, and by means of which a total combustion of
the fuel and a high temperature is attained.
In the accompanying sheet of illustrative drawings: Figures 1-4 show one
arrangement of this apparatus, while in Figures 5-7 is shown the application of
the apparatus to a kitchen-stove in order to attain a total and smokeless
combustion.
The apparatus is composed of a hollow frame a a¹ which consists in order to
facilitate its manufacture, of the two parts a and a¹. The lower half of the inner wall
of this hollow frame is provided with holes, whilst the upper half without holes,
formed by the part a¹ is enlarged on its upper side in the shape of a funnel, and
forms a box for the fuel. Inside the perforated wall of the part a is placed a nest-
frame b, the upper edge of which serves as a rest for the grate c. The nest-frame b
is intended for leading the ashes coming from the grate into an ash box placed
under the nest-frame b in order to prevent choking up of the holes provided in the
inner wall of the frame. This frame may diminish downwards in shape of a
funnel as shown in the drawing, or keep the same width through its whole height,
in which latter case a sufficient space must be provided for the admittance of air
to the grate c, between the nest-frame 6 and the perforated wall of the hollow
frame. The space within the hollow frame a a' containing the grate only com-
municates with the outer air by openings d d formed in the hollow frame a a¹ and
provided with sliding doors d' d' so that air introduced under the grate c takes
the course indicated by arrows in Figures 2, 3, and 4 before it reaches the grate c.
When the fuel placed in the funnel-shaped part a' upon the grate c is ignited the
inner wall of the hollow frame becomes red hot whereby the air passing through
the hollow frame on its way to the grate c is heated to such an extent that the fuel
placed on the grate burns with white-heat and without smoke. The heat given off
is so considerable that it was found a piece of iron inserted in the fuel began to
smelt in 5 minutes. In the kitchen stove shown in Figures 5-7 to which the
present apparatus is applied, the smoke combustion is very considerably increased by
the combination of two apparatus in such way that the gases of combustion given off
on the grate 1 are conducted as indicated by arrows in Figures 5-7 under the grate 2.
where they burn. In the same manner the gases given off on the grate 2 are again
conducted under the grate 1. Each grate is fed while the other one is at full
white heat. By the complete intermixture of the gases of combination of both.
17

page_text: grates attained by this construction a smokeless combustion is produced. In order
to lead off the gases produced in lighting the respective fires, two passages 3 and 4
are provided which may be regulated or shut by sliding doors or other suitable
means and which two passages discharge into a passage 5 leading to the chimney.
When once the fuel on both grates is in white heat these passages may be shut
nearly completely.
By means of this apparatus, described for an example in application to a kitchen
stove, one is enabled to attain a total combustion of smoke with any furnace. This
apparatus requires no special attention, is very simple and solid and may be fitted
to every furnace without much expense.
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
An apparatus for attaining a smokeless combustion and a high temperature, con-
sisting of a hollow frame a a¹ the lower half of the inner wall of which is provided
with holes and the interior space of which communicates with the outer air by
openings d d provided in the outer wall of the frame, which openings may be regulated
by sliding doors or other suitable means and of a nest-frame 6 fitted inside the
perforated wall of the hollow frame, on the upper edge of which nest-frame rests a
grate e in such way that the grate in conjunction with the unperforated upper part
of the inner wall of the hollow frame forms a fire basket and holds the fuel, the
whole substantially as herein set forth.
Dated this 17th day of August 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.