Improvements in Gas Stoves.
Year: 1894

page_text: Date of Application, 21st Nov., 1894-Accepted, 22nd Dec., 1894
Improvements in Gas Stoves.
I, FRANZ LÖNHOLDT of Böckenheimer Landstrasse, Frankfort-on-the-Main,
Germany, Architect, 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 object of this invention is the construction of gas stoves in such a way as
to increase the useful effect of the heat of the gas and of the gaseous products of
combustion.
In the drawings
Fig. I is a vertical sectional elevation of a gas stove constructed in accordance
with this invention. Fig. 2 a horizontal section taken just over the gas burners
through line C-D of Fig. 1 and Fig. 3 is a horizontal sectional view of the base
through line E-F of Fig. 1.
Figs. 4, 5, refer to a modified form of construction, Fig. 4 being a vertical
sectional elevation, Fig. 5 a horizontal section through line G-H of Fig. 4 and
Fig. 6 a horizontal section through line I-K of Fig. 4.
Figs. 7, 8, 9 refer to a further modification, Fig. 7 being a vertical sectional
elevation, and Figs. 8 and 9 respectively horizontal sections through line L-M
and N-O of Fig. 7.
Figs. 10, 11, refer to an open gas stove, being respectively a vertical sectional
view and a horizontal section through line P Q of Fig. 10.
a is the combustion chamber. 6 gas tube or gas tubes led into the same and
provided with burners for the heating flames c. The back of the combustion
chamber is formed by the parabolic metal reflector d which also separates from
the combustion chamber a, the passage e for the supply of the air for com-
bustion. In front the combustion chamber is closely shut off by the door f which
may be provided with a mica pane or disc. Opposite the gas flames at g the front
of the stove casing is bulged or enlarged outwards. The air passage e situate
behind the reflector for the supply of the air of combustion opens underneath
into the base of the stove. h is a wire strainer arranged at the top of the base
to divide the air current. The passage e is covered over at top by the oblique
wall of the air flue i open at top and bottom and leading up through the
middle of the stove, and further by the inclined copper plate k. Within the
angle thereby formed the gas tube is so placed that the flames take a direction
downwards round the plate k. The upper part of the reflector d is so bent
round that between this part and the plate k there is formed a nozzle like channel
in which the heating flames burn in such a way that at their front they pass out
beyond the reflector d and burn round the edge of plate k. m is a slit or narrow
passage formed by the outward enlargement of the stove casing at 9 and the
plate k, through which slit the gases of combustion pass into the heating flues
of the stove. The air streams through the passage e to the flames to be
thoroughly burnt with the gas underneath and over the flames and under the
glowing hot plate k. In this way the admission of cold unburnt air into the stove
flues, as occurs in open gas stoves of ordinary construction, is prevented. The
gases of combustion travel past the slit m in the direction shewn by the arrows,
through the flue n to underneath the stove cover thence from the right to the left
of the air flue i over a partition o which divides the space between the outer wall
of the stove casing and the sides of the air flue i into a front and back space
D
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page_text: (Fig. 2), thence through, the flue p downwards through an opening 9 in the base
and round the air flue to the discharge pipe r.
For the purpose of better heating the chimney, say to begin with, or of
conducting the heat from the stove more direct into the same when this course
may be considered necessary, provision is made of an outlet t fitted with a
valve or slides and leading into the discharge pipe r near the top of the stove.
In Figs. 4, 5, 6, the gases of combustion pass out of the space a only to the
upper part of the stove so that this may be used in connection with chimneys
having but a slight draught. Between the air flue and the stove casing, baffle
plates u, x, y, z, are fixed to incline alternately from the back upwards to the
front and from the front upwards to the back, the top plate z inclining in the
latter manner to the outlet r which is inclined in the like direction. These
baffle plates are provided with apertures u¹, x, y, z¹ alternating at the back
and front of the stove for the passage of the gases of combustion, said back and
front apertures being separated by the air flue i. The gases of combustion first
pass upwards to the plate u then backwards and right and left through u¹ into the
second stage and so on. A stove of this kind in addition to working with an
easy draught possesses the advantage that any water entering the stove from the
chimney flows downwards from baffle plate to baffle plate, being finally converted
into vapour and increasing the heating effect of the stove.
In Figs. 7, 8, 9, there is in addition to the air flue or air passage i second air
circulating passage t', a perpendicular flue being formed at the back of the
stove. The second air flue t¹ is formed by the segment like back of the stove
casing and the wall of the flue ». By means of the air flue t¹ the air of the room
in which the stove is located may be warmed, whilst the air flue i may be placed
in communication with the outside air. The heating effect of the store is
considerably augmented by the air flue t' and flue v. The stove casing is open at
bottom and at top has apertures for the air flues. Two gas pipes are shewn with
a division plate w. t is the outlet.
In the open gas stove shewn in Figs. 10, 11 there are a number of flat heating
chambers 1, 2, 3, 4, 5, so arranged one above another as to lie inclined downwards
from the front towards the back and increasing in depth measured from the front
to the back as they proceed higher so that the highest heating chamber 5 bears
upon the back of the stove casing. The gases of combustion pass from one
heating chamber to another through connecting passages which are so set out
zig zag relatively to one another that the gases of combustion flow alternately
first at the front through two side passages then at the back through a central
passage and then further in an analogous manner into and through the several
other flat heating chambers. In the heating and circulating operation of the
open gas stove the gases of combustion pass through the heating chambers 1, 2, 3,
4, 5, and by reason of the zig zag placed connecting passages of the latter,
impinge most intimately against the surfaces of each heating chamber. The
hot surfaces of the heating chambers form nozzle like air passages or channels
which are highly heated. The air of the room or the outside air which may also
pass freely from the bottom of the stove into the circulating space is drawn with
a strong force through the nozzle like channels T into the heating space because
the air circulation space of the stove is much narrowed from below upwards and
at the top is quite shut off.
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 gas stove with closed combustion chamber a in which the heating flames
burn in a nozzle like combustion channel formed by the plate k disposed over the
_ flames and by the forwardly curved top of the reflector d, in combination with an
enlargement in the stove casing in front of the end of said combustion channel
substantially as described with reference to Figs. 1, 2 and 3 of the drawings.

page_text: 2. In the gas stove referred to in Claim 1, the arrangement for conducting the
gases of combustion through an opening g in the base and round an air circulating
flue before said gases escape to the chimney, substantially as described and
shewn.
3. In a gas stove of the kind referred to the arrangement, for guiding or
deflecting the gases of combustion; of inclined plates u, x, y, z, which are inserted
between the stove casing and the air flue i, on which plates precipitated water may
flow downwards and be converted into vapour, substantially as described with
reference to Figs. 4, 5 and 6 of the drawings.
4. In a gas stove of the kind referred to, the arrangement of a second air flue t'
the whole of the surrounding surface and the whole height of which is impinged
against by the escaping gases of combustion, substantially as described with reference
to Figs. 7, 8 and 9 of the drawings.
5. In an open or closed gas stove of the kind referred to, the conducting of the
gases of combustion through a number of flat heating chambers located one above
another and increasing in depth from the bottom one upwards, whilst the
circulating air is drawn between said chambers, substantially as described with
reference to Figs. 10 and 11 of the drawings.
Dated this 21st day of November 1894.
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant.