Year: 1886

page_text: Date of Application, 4th Feb., 1886.
Complete Left, 4th Nov., 1886.
Complete Accepted, 11th Jan., 1887.
ARDEN HILL Gas stove Manufacturer 14, 16, 18 Constitution Hill Birmingham do
hereby declare the nature of this invention to be as follows :—
In any gas cooking oven where gas is burnt inside the oven I fix inside at the
upper part of said oven one or more slabs of firebrick or other suitable material which
shall be perforated with holes-through which the heated air and products of
combustion rising from the gasburners are made to pass before finally escaping from
the oven.
The said slab or slabs of firebrick or other material shall act in the first place as
a check upon the too-rapid escape of the heated air and products of combustion from
the oven and in the second place by virtue of their becoming exceedingly hot
through the heated air passing through them I design them to act as conservators and
deflectors of heat inside the oven.
In still further carrying out my invention for utilizing the waste heat that passes
away from the interior of a gas cooking oven I attach, by any convenient method, to
the outlet pipe of the oven-a chamber through which the waste heat and products of
combustion are conducted and finally allowed to escape by an outlet or flue pipe from
the chamber.
This chamber may be of any shape or size provided it is fitted with a moveable, lid
or cover which can be easily lifted off for the purpose of placing an ordinary cooking
utensil over the opening in such a manner that the waste heat rising from the outlet
pipe of the oven into the chamber in its passage through the chamber shall impinge on
the bottom of the cooking utensil-These cooking utensils would be better made with
a well to fit into and partially fill up the chamber so that the waste heat rising from
the outlet pipe of oven would then impinge upon and circulate round that portion of
the utensil contained by the chamber on its way to the outlet of such chamber.
This chamber which I attach to the outlet pipe of a gas oven may also be used for
warming plates if a suitable door or sliding panel be fitted for admission of same.

page_text: Improvements in Gas Cooking Ovens for Utilizing Waste Heat.
I, ARDEN HILL of 14, 16 and 18 Constitution Hill Birmingham, Warwickshire, do
hereby declare the nature of my invention for "IMPROVEMENTS IN GAS COOKING OVENS
FOR UTILISING WASTE HEAT," 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 my invention is to utilise and conserve the waste heat in gas cooking
ovens as hereinafter described.
In carrying out my invention I make the oven of an upright rectangular figure of
cast iron, having suitable inside fittings according to the character of oven, to which
my invention is to be applied; and within the said oven, the heat and other products
of combustion generated from the gas burners pass, and circulate and pass upwardly
in a circuitous manner, and situated or fixed within the upper part of the oven, a slab
or slabs of reticulated or perforated fire brick is disposed, and through the holes of
which, the heated air and products of combustion generated and arising from the gas
burners are made to pass, before escaping from the oven.
The slab or slabs of reticulated fire brick or other suitable material acts in the
first place as a check or damper upon the too rapid escape of heated air; and in the
second place, in virtue of their heat absorbing properties, they become conservers and
deflectors of heat inside the oven.
The waste heat and products of combustion which in ordinary ovens pass away to
the flue pipe, is still further utilized by being conducted through a conically or other
shaped well or chamber situated at the entrance to the flue pipe, and which said well
or chamber is provided with a lid or cover to close the open top, when a vessel
containing water or other cooking utensil and the like is not within it.
When the chamber is in use as an auxiliary heater, for culinary utensils, the heated
air and products of combustion first pass circuitously over, under and through the
shelf gratings, and thence upwards through the perforated fire-brick slab or slabs, and
thence through a necked inlet to the chamber, so as to impinge upon the sides and
bottom of a vessel or other cooking utensil placed or suspended through the open
mouth of the well or chamber as described.
The cooking utensils employed are preferably made of a conical figure, so as to fit
the open mouth of the chamber, which allows the heat to freely circulate around the
bottom and sides of the vessel, and after having done duty, is then allowed to pass
away by the flue-pipe connected to near the top of the chamber in a zig-zag manner.
This auxiliary heating chamber in juxta position to the flue pipe, may be if
necessary enlarged, for the warming of plates and other objects, admission being
gained thereto by a sliding or hinged door or panel..
I will now proceed to describe with reference to the accompanying Drawing the
manner in which the same is to be performed.
Figure 1 represents a perspective view of a cooking oven constructed and containing
improvements made according to my invention. Figure 2 is a vertical section of the
same upon the dotted lines A B.

page_text: a is the body or shell of the stove surrounded by a jacket or outer casing b, and
between the outside of the former and the inside of the latter, a stratum or layer of
some nonconducting material such as Silicate cotton is interposed. c is the door for
gaining access to the interior d, which is provided with grating shelvings e, upon
which articles to be cooked are placed. is the gas burner of the stove, fed with
gas from the outside piping 9.- - is a fire brick or other slab pierced with holes i
through which the heated air and products of combustion pass upward into the shallow
chamber or enclosure j, at the crown of the oven, and from thence through the
throttled inlet to the auxiliary chamber k, wherein a pot or other culinary vessel can
be placed, when the lid or cover is not upon the open top k³, as represented in
the section figure 2. is an outlet flue-pipe leading from the supplementary heating
chamber k, which said flue-pipe is cranked or diverted at the junction of the chamber
with it, so as to prevent a direct all-through passage; or in other words, in order to
cause the heated air or products of combustion to take the most circuitous course as
possible before finally passing away. m is a framework for holding the bodying
ring-burners of the stove.
The pierced or reticulated slab i when the stove is in use, becomes highly heated,
and acts as a conserver and as a deflector of heat within the inside.
Although I have only represented the use of a single reticulated fire-brick slab,
arranged at the top of the inside of the oven, yet two or more of the said slabs may be
disposed at suitable distances lower down, for increasing and conserving the heat.
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 :-
First. Arranging within the interior of cooking ovens, at the crown part thereof,
a reticulated or perforated fire-brick or other like slab or slabs, to act as conservers,
regenerators or deflectors of heat, substantially as described and set forth.
Secondly. Constructing or providing gas cooking ovens with a supplementary box
like chamber or chambers with removable lid k³, and which said chamber or chambers
are situated preferably at the top or upper part of the oven, and contiguous to the flue
or outlet pipe; so that the heated air and products of combustion given off from the
oven, are concentrated and made to pass through the said chamber before escaping
into the fine-pipe, substantially as described and set forth.
Thirdly. The improvements in the construction and arrangement of parts of gas
cooking ovens which are simplified in their construction and rendered more efficient
and convenient than those of the ordinary construction, substantially as described and
illustrated.