Improvements in Spirit or similar Fluid Fuel Stoves for Cooking or Heating.
Year: 1898

page_text: Date of Application, 16th Sept,, 1898-Accepted, 12th Nov.,
1898
COMPLETE SPECIFICATION.
Improvements in Spirit or similar Fluid Fuel Stoves for Cooking or
Heating.
I, OTTO HURSCHMANN, Manufacturer, of 22 Olgastrasse, Rittershausen,
Barmen, in the Empire of Germany, do hereby declare the nature of this inven-
tion, and in what manner the same is to be performed, to be particularly des-
cribed and ascertained in and by the following statement:
-
This invention for improvements in spirit or similar fluid fuel stoves for cook-
ing or heating has for its object to provide a cooking or heating apparatus for
the combustion of spirit or other fluid fuel, in which the spirit or fuel is vaporised
by heating at a high temperature and the vapour mixed with air before com-
bustion, producing a very high heating power and effecting complete combustion
of the fuel.
In the accompanying sheet of illustrative drawings: Fig. 1 is a sectional eleva-
tion of a spirit stove constructed according to this invention. Fig. 2 is a plan
of the same without the reservoir. Fig. 3 is a sectional elevation of a modified
form of burner valve, Fig. 4 is a detail view, and Fig. 5 is an elevation of a
modified form of burner.
The reservoir a supplies the liquid fuel through a tube b to a vaporising
chamber c from whence it passes to the burner d. The vaporising chamber c
and burner d are in the form of two superposed hollow rings or annular chambers
brazed together, the upper ring or vaporising chamber c being smaller than the
lower ring or burner d. The lower ring perforated on its upper surface, is
provided with two tubes f g the inner ends of which project towards each other
from opposite sides of the ring, the narrower tube 7 being in communication
with the upper ring or vaporising chamber c through the short tube h and form-
ing the vapour outlet. The inner end of the wider tube f projects to within
a short distance of the vaporised fuel outlet, so that the vapour on issuing there-
from is mixed with air and the mixture conducted through the tube f to the
lower ring d from whence it passes out through perforations i to be ignited.
The flames issuing from the perforations after ignition are regulated by a valve
which controls the vapour outlet.
The flow of vapour from the tube 9 is regulated by a valve closing from the
outside and consisting of a screw threaded spindle k screwing in a nut / formed
on the outer end of the tube f. The inner end of the spindle k is coned to fit
a corresponding seat in the end of the tube g.
The advantage of a valve closing from the outside over the ordinary inside valve
consists in that the outside valve is wholly visible and, being easily controlled
and cleaned, is not liable to leak or rust.
In the modified arrangement of valve shown in Fig. 3 the valve spindle k screws
into a nut formed on the outer end of the tube g and its seating is on the interior
of the gas outlet.
As the gas passes from the outlet into the receiving tube it becomes mixed
with air in the intervening open space and the effect is an increased heating of
the flame and a saving in the quantity of fuel required.

page_text: The spirit conducting tube 6 is connected to the ring c and provided with a
cap m which may be unscrewed in order to introduce a plug n Fig. 4 for regulat-
ing the flow of fuel. This plug consists of a tube formed of metal gauze filled
with powdered brick, stone or other porous material.
When igniting the stove the valve is opened wide enough for the liquid to
drop out of the small tube g through the outlet thereof and flow into the pan t
underneath, where the liquid fuel is ignited and heats both rings to such a degree
that after a short time only vaporised fuel under pressure flows from the upper
ring out through the tube g, enters, whilst mixing with air, into the tube f and
lower ring d where it passes out through the holes i and ignites. Whilst burning
the flames impinge against the upper ring causing a constant vaporising of the
fuel therein. By means of the valve the flow of vapour and thus the flames can
be regulated at will to any degree.
The heat is transmitted to the utensil stand and to any cooking or heating
utensils placed thereon.
Instead of the circular vaporising chamber and burner, I may employ a straight
vaporising tube superposing a straight burner tube, Fig. 5, so as to render the
burner more suitable for the purpose of heating tongs and the like.
In this
arrangement the burner tube d has two rows of perforations & one on each side of
the vaporiser c.
It will readily be scen that the principles of the burner vaporising chamber
and outside valve are applicable to shapes other than those hereinbefore described.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. In a spirit or similar cooking or heating stove, the combination with a burner
consisting of a hollow perforated ring, of a vaporising chamber also in the form
of a hollow ring superposed on and heated by the flame from the burner substan-
tially as described.
2. In a spirit or similar cooking or heating stove the straight burner and
vaporiser substantially as described with reference to Fig. 5.
3. In a spirit or similar cooking or heating stove, the arrangement of tubes
for conveying the vapour from the vaporising chamber to the burner and effect-
ing the mixture of air and vapour substantially as described.
4. The valve arrangement acting on the outer end of the vapour tube outlet for
controlling the flow of vapour and thus the several flames from the perforations
in the burner, substantially as described with reference to Fig. 1.
5. The arrangement and construction of valve substantially as described with
reference to Fig. 3.
6. The improved spirit or similar fluid fuel stoves for cooking or heating sub-
stantially as described with reference to the drawings.
Dated this 16th day of September 1898.
OTTO HURSCHMANN.