IMPROVEMENTS IN PORTABLE COOKING RANGES
Year: 1879

page_text: LETTERS PATENT to David Wilson, of No. 2, Percy Square, King's Cross Road,
in the County of Middlesex, Stove and Range Manufacturor and Hot Water
Engineer, for the Invention of "IMPROVEMENTS IN PORTABLE COOKING
RANGES."
Sealed the 6th April 1880, and dated the 6th December 1879.
PROVISIONAL SPECIFICATION left by the said David Wilson at the Office of
the Commissioners of Patents on the 6th December 1879.
DAVID WILSON, of No. 2, Percy Square, King's Cross Road, in the County of
Middlesex, Stove and Range Manufacturer and Hot Water Engineer. "IMPROVE-
MENTS IN PORTABLE COOKING RANGES."
The object of this Invention is the construction of portable cooking ranges that
better combustion of fuel and consumption of smoke combined with a greater.
distribution of heat shall take place than in such ranges at present made.
For the purposes of my Invention I leave a space on each side between the cast
iron fire basket and the walls of the oven or ovens that atmospheric air may in its
passage take up heat and be rendered combustible before it enters the smoke
passages. The upper portions of the side walls of the fire basket are serrated,
perforated, or provided with apertures through which the heated air may pass, the
projections being preferably of pointed teeth shape to check the rush of air through
between them, that only sufficient quantity be permitted to commingle with the
smoke.
Behind each series of serrations is a baffle plate or strip projecting from the top.
of each of the ovens to further check the rush of air entering the smoke chamber or
chambers, a second baffle plate or strip being arranged inside the top plate to direct
the smoke and flame from the fire towards the path of the inflowing heated air for
the development of heat in the smoke chamber or chambers and the perfect
combustion of the gases and smoke.
The top plate of each of the ovens I make thicker than usual, to retain the heat
for a long period and to prevent the top becoming red hot and burnt, as is the case
with thin top plates.
Instead of fitting legs and feet to portable cooking ranges I purpose arranging a

page_text: screen or close base at the bottom, the inner space of same forming a chamber into
and from which air may freely pass for distribution in the room in which the range
may be fitted.
The usual flueways and valves for directing the travel of the heat and vapour
around the ovens and boiler, and also the usual clearing out spaces are arranged
that the flues may be cleared of the accumulating refuse from the fire.
A further improvement in portable cooking ranges consists in making the fire
door double with angled projections on the inner face of one plate. that the ends
may bear against the inner face of the other plate. Apertures are formed in the
outer plate at the upper part, that cold air entering into the spaces between the
angled projections may be heated in its downward passage to other apertures
leading to the spaces at the side walls of the fire basket. By this means the
contact of cold air to the fire basket is obviated and the entire heat thrown out
from the fuel utilized.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David Wilson in the Great Seal Patent Office on the 5th June
1880.
DAVID WILSON, of No. 2, Percy Square, King's Cross Road, in the County of
Middlesex, Stove and Range Manufacturer and Hot Water Engineer. "IMPROVE-
MENTS IN PORTABLE COOKING RANGES."
The object of this Invention is the construction of portable cooking ranges that a
better combustion of fuel and consumption of smoke combined with a greater
distribution of heat shall take place than in such ranges at present made.
For the purposes of my Invention I leave a space on each side between the cast
iron fire basket and the walls of the oven or ovens that atmospheric air may in its
passage take up heat and be rendered combustible before it enters the smoke
passages. The upper portions of the side walls of the fire basket are serrated,
perforated, or provided with apertures through which the heated air may pass, the
projections being preferably of pointed teeth shape to check the rush of air through
between them that only sufficient quantity be permitted to commingle with the
smoke. Behind each series of serrations is a baffle plate or strip projecting from
the top of each of the ovens to further check the rush of air entering the smoke
chamber or chambers, a second baffle plate or strip being arranged under the top
plate to direct the sinoke and flame from the fire towards the path of the inflowing
heated air for the developement of heat in the smoke chamber or chambers and the
perfect combustion of the gases and smoke.
The top plate of each of the ovens I make thicker than usual, to retain the heat
for a long period and to prevent the top becoming red hot and burnt, as is the case
with thin top plates. Instead of fitting legs and feet to portable cooking ranges
purpose arranging a screen or close base at the bottom, the inner space of saine

page_text: forming a chamber into and from which air may freely pass for distribution in the
room in which the range may be fitted.
The usual flue ways and valves for directing the travel of the beat and vapour
around the ovens and boiler, and also the usual clearing out spaces are arranged
that the flues may be cleared of the accumulating refuse from the fire.
A further improvement in portable cooking ranges consists in making the fire
door double with angled projections on the inner face of one plate that the ends
may bear against the inner face of the other plate. Apertures are formed in the
outer plate at the upper part, that air entering into the spaces between the
angled projections may be heated on its downward passage to other apertures
leading to the spaces at the side wall of the fire basket. By this means the
contact of cold air to the fire basket is obviated and the entire heat thrown out
from the fuel utilized.
Figure 1 of the annexed Drawings represents an elevation of a double ovened
close range having the front plate removed to show my improvements arranged
therewith.
A, A, are spaces formed between the cast iron fire basket B and the side walls C, C,
of the oven for the passage and reheating of atmospheric air which enters the spaces
A, A, from apertures D, D, (Figure 2) in the double fire door E, E, as is indicated
by the top sectional view of same in Figure 3.
The two portions E, E, of the door are at a distance apart, and the inner one is
provided with teeth like projections or gills F, F, which throw off their heat to the
air as it passes down the apertures between the gills to side outlets H, H, which
form the communication between the spaces D, D, and the spaces A, A, that the air
when it leaves the spaces A, A, through the passages J, J, is sufficiently heated to
commingle with the flame, smoke, and vapour given off from the fire as they pass
over the lips or baffle plates K, K, for the development of great heat within the
smoke chambers L, L, and a perfect consumption of the smoke therein, the baffle
plates K, K, acting in conjunction with other baffle plates M, M, depending from the
top plate N to direct the flame, smoke, vapour, and heated air in a thoroughly com-
bined condition into the chamber L.
Below the outlets H, H, which are formed in the front plate P of the range, and
within the area of the fire basket, as in the transverse sectional view, Figure 2, is
an opening for the passage of atmospheric air to the fire, the air through this
opening acting in conjunction with that entering through the ash pit door R. serving
to support the combustion of the fuel.
S, S, are the top plates of the ovens, which I purpose making thicker than usual
that they may resist the action of the fire for a longer period than thin ones, and
also that they may impart a more regular heat to the upper part of the ovens and
prevent the usual top burning of articles of food being baked therein.
T, T, are flap valves which can be turned by outside handles to direct the heated
vapour down round one or other or both of the ovens, as desired, the vapour then
passing under the ovens to the passages U, U, before entering the flue stack V, the
vapour in its transit under the ovens impinging against the "gills" W in a manner
well known.
X is a plate forming the bottom of the range, and instead of fitting the range
with feet I purpose covering the lower part in by a plain or ornamental screen.
Y is a base through the perforations of which atmospheric air may have free play
and become beated for room warming purposes.
I have arranged my Invention in the Figures referred to to a double oven range,
but it is equally applicable to those which have boilers at the back, the draw off
pipe of which can be run round one side of the range, as at Z. If necessary the
lips b, b, and projections c, c, may be serrated for the passage of air to and from the
back of the fire basket.
Figure 4 is a sectional elevation of a single oven and side boiler range with my
Invention applied, the double door, Figure 3, being adapted thereto. In this view
the boiler side of the range has a vertical grating or perforated partition plate a

page_text: at a short distance from the side wall d, whereby a space e is formed between it
and the fire basket, this being suspended in the fire chamber by the upper lip b
resting upon projections c, c. In this single oven and side boiler construction of
range the side wall of the fire basket on the boiler side has one or more apertures e
through which a portion of the flame and heat pass to and through the grating
partition, as indicated by the arrow, and impinge against the boiler, then down-
wards under the boiler, and up the opposite side to the flue. A sliding valve g is
fitted to close the perforation of the fire basket wall to partially or completely shut
off the passage, such as when the boiler heat has to be reduced or all the heat
directed to the oven.
•
Having now described the nature of my said Invention, and in what manner the
same is to be performed, I declare that I claim,-
First. The arrangement or arrangements of parts, and the several details improve-
ments in portable cooking range, as herein before described and shown in the
annexed Drawings.
Secondly. I claim the spaces A, A, at the sides of the fire basket, the passages
H, H, in the front plate, and the passages in the double door, all arranged in the
manner set forth, for gradually heating air and rendering it suitable for the con-
sumption of smoke and the development of great heat in the smoke chambers of
portable cooking ranges, as described.
In witness whereof, I, the said David Wilson, have hereunto set my hand and
seal, this Fourth day of June, in the year of our Lord One thousand eight
dnighter
Witness,
H. GARDNER,
Patent Agent,
40, Fleet Street,
London.
DAVID WILSON. (L.S.)