Improvements in Stoves.
Year: 1892

page_text: Date of Application, 21st Apr., 1892-Accepted, 28th May, 1892
Lט עעULI
Improvements in Stoves.
We, BERNHARDT HELLMANN, BOHUMIL LUDIKAR and FRANZ SUDA of
Stefaüs, g. 26 Prag in the Empire of Austria, Merchants and Manufacturers 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 improvements in stoves for heating and ventilating, and
consists in the construction of stoves by which regulation and ventilation is rendered
possible, enabling them to be used as ventilators for rooms.
The stove consists (as will be seen upon reference to the accompanying sheet of
drawings upon which Fig. 1. is an elevation of a stove embodying our invention
and Fig. 2. is a vertical section through the same,) of the following parts.
E. is the foot or frame of the stove upon which is the ventilating chamber F with
its ventilating fans S. B is the fire-box and B' the ash pit provided with fire
bars c, and with the lower stove-door b. shut off from the ventilating chamber F,
by the bottom g', the side of the foot or frame E of the stove is perforated.
The ventilating chamber F is shut off from the ash-pit B₁ but at the side
walls it has openings v. all round leading into the space J. formed between the
stove-walls Hh, is a cast iron flame-cylinder within which is a fire brick lining k;
is a cast iron feed-cylinder, k' is a fire brick shell round the same.
The feed-cylinder A¹ joins the feed-chamber A and carries its contents from the
regulating feed door a.
The funnel shaped head piece l. immediately over the feed-chamber A is
surrounded by an upper stove-cylinder t. and forms the upper space of the
stove D.
On the funnel lead piece l. is a smoke fluc m. and on the top of the stove
cylinder t. is the lid or cover.
The smoke-flue n branches off from the convex surface of the stove cylinder t,
which encloses the whole stove.
The working of the stove is as follows :-
11
The fuel to be consumed on the fire-bars c, is lit from the stove door b, and this
door is then hermetically closed.
The draught-hole i, on the upper stove-door a. is then screwed open wide enough
to allow the draught to pass in sufficient volume through the feed chamber A to
reach the flames on the bars and feed them.
The rate at which the stove burns can be regulated by the amount of opening
given to the draught-hole i.
While the lowest layer of coal is burning on the bars the upper layers are
heated and calcined by the flames which are diffused by the feed cylinder h' in the
flame-space C. The gases generated by this means are carried by the draught
which can find access only by the draught-hole i to the fire on the bars and there
burn away easily and completely in a blaze of sulphurous flame, in the crescent
shaped flame space C and in doing so they heat the flame-cylinder /².
The incombustible but heated gases escape through the funnel shaped head
picce into the upper stove-space D, where they afterwards turn downwards
passing around the smoke flue m into the fluc n.
In this way the heat of the gases is completely absorbed by the walls of the
stove before they enter the flue n. whence they are carried away in the form of
cooled and useless gases.
From the stove thus heated warmth is conveyed to the outer surface of the
stove H, and especially to the air contained in the space J, which escapes upwards

page_text: into the room whilst the cooler air of the room below the stove frame or foot E
makes its way in through the openings in the ventilating chamber F in order to
be heated above and again expelled into the room.
If it is desired at the same time to effect ventilation with the external fresh air,
the handle or knob q. of the ventilating fan S is turned to any desired distance,
according to the greater or smaller quantity of fresh air which it is desired to
admit.
The fresh air entering by the conduit r, which leads into the room from below
passes into the ventilating chamber F and thence through the openings into the
intervening space J, and enters the room as fresh warm air, the air from the room
on the other hand (displaced by it) passes through the draught-hole i into the stove.
to the flames.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. In heating and ventilating stoves the combination of the flame cylinder ki,
with the feed cylinder h¹, together forming the crescent shaped flame space C,
constructed combined and arranged, substantially as and for the purposes described.
2. In heating and ventilating stoves, the ventilating chamber F, and the ash
pit B', having openings v. leading to the annular space J between the cylinders h
and H, substantially as and for the purposes described.
3. Ventilating and heating stoves, constructed combined and arranged substantially
as described and set forth in the accompanying Specification.
Dated this 21st day of April 1892.