Year: 1899

page_text: We, LA SOCIÉTÉ ANONYME DES USINES DU PIED-SELLE, of Fumay (Ardennes),
in the Republic of France, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in heating apparatus generally,
continuous burning
and is especially applicable to the kind or class known as
and slow combustion " stoves.
In these stoves it is attempted to moderate the combustion in such a manner
that the fuel is fed in only at long intervals, generally once each day.
One of the best means to obtain this result is to put the ash-pit A in direct
communication with the smoke-pipe B by means of a passage O; the cold air
which enters the ash-pit A through the opening controlled by the damper D
passes partly through the fuel E, while the other part is conducted directly
into the smoke-pipe B without passing through the fuel E; this cold air enter-
ing the smoke-pipe B diminishes the draught and consequently retards the
combustion.
The direct passage by the draught-retarding orifice F offering considerably
less resistance to the flow of air than the passage through the fuel E, the
importance which attaches to a judicious proportion between the cross sectional
area of this orifice F and the quantity of air which enters per second through
the damper D will be readily understood too large a cross sectional area of
the orifice F could completely stop the draught through the fuel, and too small
a cross sectional area on the contrary would moderate it insufficiently.
It will be understood that if this orifice is of an invariable cross sectional
area, it will only permit the apparatus to work imperfectly, for such cross
sectional area is only suitable for a particular rate of admission of air by the
damper D and will not be suitable for other positions of the damper correspond-
ing to other rates of admission of air.
It will, therefore, be understood that, if a regulating valve G is placed across
the orifice F and operated independently of the damper D, mediocre results will
still be obtained, since it will be difficult to regulate the cross-sectional area of
the orifice exactly to a suitable amount each time the admission of air is varied.
Our invention consists in automatically regulating the opening of the orifice F
to a suitable amount by a single movement of the damper D.
In the accompanying drawing we have shown in Figures 1 and 2, as an

page_text: example only, a simple arrangement embodying our invention. The damper D
can turn about its axis through an angle of 90 degrees; it is pierced with
holes hh which correspond, according to its position, with holes or solid parts
of the wall of the ash-pit A. The two extreme positions of the damper D
correspond to the maximum admission and complete cut-off of air respectively.
The damper D. is rigidly connected by a rod I to the valve G of the orifice F,
which therefore has the same angular motion.
When the admission of air is at a maximum, the valve G is closed and all
the air passes through the fuel. When the admission of air is cut off, the
valve G is opened to its greatest extent, thus drawing off all the air that can
leak through the joints of the apparatus.
Figures 3, 4 and 5 show details of another arrangement which permits an
exactly suitable opening of the draught-retarding orifice corresponding to each
intermediate position, for the admission of air, of the damper.
Jis a damper-plate, and
ka hole through the damper-plate.
L the wall of the ash-pit.
m a hole through the wall of the ash-pit.
S
Na rod rigidly connecting the damper-plate and the valve 0.
O the valve or disc controlling the draught-retarding orifice, and turning
with the damper-plate.
P is an opening of the valve, calculated for each position.
Qthe wall through which the draught-retarding orifice opens.
R the draught-retarding orifice.
It will be seen, from the shape of the opening of the valve, that, when it is
turned, different sized openings are obtained, depending on the outline of the
hole, which permits a suitable opening of the draught-retarding orifice for each
position of the damper.
It will also be noted that the cross sectional area of the opening of the valve 0
can be radically different even for only very small changes of position of the
damper. This is the case when the edges s, t, u, of the valve come successively
across the draught-retarding orifice R.
The herein before described arrangements serve only to illustrate the principle
of our invention; and we can, if desired, modify them when putting the invention
into practice.
1000
We, LA SOCIÉTÉ ANONYME DES USINES DU PIED-SELLE, of Funay (Ardennes),
in the Republic of France, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer
tained in and by the following statement: -
This invention relates to improvements in heating apparatus generally
and is especially applicable to the kind or class known as
continuous burning
and slow combustion stoves.
In these stoves it is attempted to moderate the combustion in such a manner
that the fuel is fed in only at long intervals, generally once each day.
In the drawing accompanying our Provisional Specification we have shown,

page_text: in Figures 1 and 2, as an example only, a simple arrangement embodying our
invention, in which the ash-pit A is put in direct communication with the
smoke-pipe B by means of the passage C. The cold air, which enters the ash-
pit A through the opening controlled by the damper D, passes partly through
the fuel E while the other part is conducted directly into the smoke pipe B
without passing through the fuel E; this cold air entering the smoke-pipe B,
diminishes the draught and consequently retards the combustion.
The direct passage through the draught retarding orifice F offering infinitely
less resistance to the flow of air than the passage through the fuel E,. the
importance of a judicious proportion between the cross sectional area of this
orifice and the quantity of air which enters per second through the damper D,
will be readily understood; too large a cross sectional area of the draught-
retarding orifice F could completely stop the draught and too small a cross
sectional area on the contrary would moderate it insufficiently.
It will also be understood that, if this draught-retarding orifice F is of an
invariable cross sectional area, it will permit only an imperfect operation of the
apparatus for such cross sectional area is only suitable for a particular rate of
admission of air by the damper D, and will not be suitable for other positions
of the damper corresponding to different rates of admission of air.
It will therefore be understood that, if a regulating valve G is placed across
the draught-retarding orifice F and operated independently of the damper D
for controlling the admission of air, mediocre results will still be obtained, since
it will be difficult to regulate the cross sectional area of the draught-retarding
orifice F exactly to a suitable amount each time the admission of air is varied.
Our invention consists in automatically regulating the opening of the draught-
retarding orifice F to a suitable amount by a single movement of the damper D
which controls the admission of air.
The said damper D) for controlling the admission of air can turn about its
axis through an angle of 90 degrees; it is pierced with holes h, h which coincide,
according to its position, with hole's or solid parts of the wall of the ash-pit A.
The two extreme positions of the damper D correspond to the maximum
admission and complete cut-off of air respectively. The damper D is rigidly
connected by a rod I to the valve G of the draught-retarding orifice F, which
therefore has the same angular motion.
When the air-admission aperture is open to its maximum, the valve G is
closed and all this air passes through the fuel. When the air-admission aperture
is closed, the valve G is opened to its greatest extent, thus drawing off all the
air than can leak through the joints of the apparatus.
Figures 3, 4 and 5 of the said drawing show details of another arrangement
which permits an exactly suitable opening of the draught-retarding orifice
corresponding to each intermediate position of the damper controlling the
aperture for the admission of air,
Jis a damper for controlling the admission of air.
K is a hole through the damper-plate controlling the admission of air.
L the wall of the ash-pit.
M is a hole through the wall of the ash-pit.
N is a rod rigidly connecting the damper-plate controlling the admission of
air. and the valve Ö.
O is the valve or disc controlling the draught-retarding orifice, and turning
at the same time as the damper-plate controlling the admission of air.
P is an opening through the valve, calculated for each position.
Qis the wall through which the draught-retarding orifice opens.
R is the draught-retarding orifice.
It will be seen, from the shape of the opening of the valve, that, when it is
turned, the cross-sectional areas are different according to the outline of the
edges of the aperture; this permits a suitable opening of the draught-retarding
orifice R to be obtained for each position of the air-admission aperture.

page_text: It will also be noted that the cross sectional area can be radically different
even for two closely adjacent positions of the damper controlling the admission
of air. This is the case when the edges s, t, u, of the valve come successively
across the draught-retarding orifice R.
The herein before described arrangements serve only to illustrate the principle
of our invention which we can, however, modify when putting the same into
practice.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed we declare that what
we claim is :-
1. In a stove or other heating apparatus, the combination of a valve controlling
the admission of air to the stove, a valve controlling the flow of air through a
draught-retarding orifice and a rod or the like rigidly connecting the said valves,
substantially as, and for the purpose described.
2. In a stove or other heating apparatus, the combination with an air passage
separated from the fuel space and adapted to put the ash-pit in direct com-
munication with the smoke-pipe, of valves controlling the total air supplied to
the stove and the portion of the said air supply passing through the said air
passage respectively, connected together in such a manner that the movement
of one valve causes a corresponding movement of the other valve, substantially
as hereinbefore described.
66
3. The improved continuous burning and slow combustion" stove con-
structed substantially as described with reference to Figures 1 and 2 or with
reference to Figures 3, 4 and 5 of the drawings, and operating as, and for the
purposes above set forth.
TL in 92nd dow of Naramber 1800
D. YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicants.