Improvements in Gas Cooking Stoves.
Year: 1894

page_text: Date of Application, 28th Apr., 1894-Accepted, 2nd June, 1894
COMPLETE SPECIFICATION.
Improvements in Gas Cooking Stoves.
I, MICHAEL RALEIGH of Harris Street Balmain, Sydney Australia Gas
Cooking Stove Manufacturer do hereby declare the nature of my invention for
"IMPROVEMENTS IN GAS COOKING STOVES" and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
My invention relates to improvements in that class of gas cooking stoves
heated by means of a perforated pipe for roasting at the bottom, and rings for
boiling purposes at the top-and consists :-
Firstly In dividing the stove into two chambers, placed one over the other as
shewn on the drawing. In the introduction of a horizontal flue between the two
chambers, having a vent or draught-hole in the centre of the underside into which
the heated air is drawn when the gas jets are alight in the bottom of the stove,
thus concentrating the heat in the middle of the cooking chamber, where it is most
required.
When the column of hot air enters the flue, it is split up into several portions,
and compelled to travel in circuitous paths under the bottom of the top plate, thus
utilising the beat to the fullest extent, and insuring a uniform temperature in the
oven, also increasing the deflected heat over the top of the lower chamber, finally
escaping by the vent at the back of the stove in the ordinary manner.
:
Secondly In the introduction of a smooth hot plate on the top of the stove,
having the necessary openings, covers, rings &c., similar to that of a cooking
range, as shewn.
This hot plate has two atmospheric burners flattened at the
mouth, fixed close under it, and when the gas is lighted, the flame spreads under the
plate, and is drawn to the vents or outlets at the left side, through which the heated
air escapes. By these means I am enabled to boil as many vessels as the hot
plate will hold, and roast a joint of meat under the flame at the same time, thus
economising gas to a considerable degree.
Referring now more particularly to the drawings
:-
Fig. 1. is a view of the complete stove, with the doors removed, shewing the
general arrangement internally and externally. A is the connecting piece to the
gas supply, B and C are the atmospheric burners, serving respectively the large
and snall openings B' and B' and C and C. D is a branch pipe leading round to
the left hand side of the stove to supply the burners serving the narrow openings E
and E. F is the smooth hot plate, and G are knobs cast thereon, to prevent the
utensil placed over the narrow openings coming into close contact with the hot
plate, which by preventing the escape of the hot air would cause the flame to go
out. H is the upper chamber, and H' is the horizontal flue between it and the
lower chamber J. J' is the atmospheric burner serving the perforated pipe J' for
heating the lower chamber. K are ledges, to carry the various gratings or shelves
supplied with the stove.
Fig. 2. is a plan of the lower plate of the horizontal flue, in which L is the
opening through which the heated air ascends.
Fig. 3. is a plan of the under side of the top plate of the horizontal flue. Mare
the baffles or fences, cast on to the plate, of such a depth as to secure the necessary
area of flue when the upper and lower plates are bolted together. The heated air,
ascending through L (Fig. 2.) is constrained to follow the course indicated by the
arrows, on its way to the vent N, at the back of the stove, and therefore uniformly
heats the top plate, and by preventing the too rapid escape of the hot air secures
a greater temperature in the lower chamber.

page_text: Fig. 4. is a side elevation to a smaller scale of the stove, shewing the burners E¹
and E which serve the narrow openings E on the smooth hot plate.
Fig. 5. is a plan and sectional elevation of the large ring to fit over the
opening B¹, and
Fig. 6. is a plan and sectional elevation of the small ring to fit over the
openings, C, C and B².
The method of using my stove is as follows:-If one vessel only is required to
be boiled with the front burner C, the ring shewn at Fig. 6 is placed over the
opening C and the vessel put on it. The flame is then concentrated on one vessel
alone. If two saucepans are wanted to boil, the ring is placed over the opening C³,
and the first vessel put flat down over C¹, thus sending the flame under C² through
which it escapes after acting on the saucepan above it. If three vessels are to be
heated at once, the ring is removed, and the second saucepan put flat over C', which
causes the flame to travel to the opening E and heat the third vessel which is
supported above it by the knobs G. At the same time a joint may be roasting in
the top chamber, by the heat deflected downwards as already described. The
back burner B is utilised in a similar manner for roasting and boiling simultaneously,
or for boiling alone, by placing the large oval ring, Fig. 5., over the opening B
and the vessel to be heated on it, thus concentrating all the heat from B upon the
one vessel. The perforated pipes under E and E are used for heating flat irons,
boiling small saucepans, or for simmering. The stove can be adapted to the
requirements of either a large or small family, as either or both chambers can be
heated as required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed-1 declare that what
I claim is :-
let. The introduction and peculiar arrangement of the horizontal flue, dividing
the two cooking chambers in gas cooking stoves heated by means of a perforated
gas pipe at the bottom.
2nd. The combination and peculiar arrangement of the smooth hot plate and
atmospheric burners flattened at the mouth, for the top of stove, substantially as
described and shewn.
3rd. The combination of the horizontal flue, and smooth hot plate, with
atmospheric burners flattened at the mouth, substantially as described and shewn.
Dated this Twenty-eighth day of April 1894.