Improvements in Combined Cooking Ovens and Steam Cooking Connections.
Year: 1899

page_text: Date of Application, 28th Dec., 1899-Accepted, 10th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in Combined Cooking Ovens and Steam Cooking
Connections.
I, WILLIAM THOMAS PEARCE, of 203, Moray Street, South Melbourne, in the
Colony of Victoria, Stove Manufacturer, do hereby declare the nature of my
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
My invention is designed to provide a cooking oven or stove and connections
thereto by means of which baking, boiling, and steaming may be carried on
simultaneously by utilizing or using therein the heat that would otherwise go to
waste so that to bake boil, and steam cook at one and the same time requires
no more fuel consumption than for baking only.
My invention may be briefly described as follows;-
The apparatus consists of an ordinary oven or stove having attached thereto
a boiler which while providing hot or boiling water steam is generated and used
by the use therewith of a novel method of steam-tight connections for connecting
especially designed steam cooking utensils to the said boiler so that a sufficient
supply of steam is drawn from the boiler into the cooking utensils as hereinafter
described.
The accompanying drawings shew provision for using gas or oil as fuel for
heating the apparatus, but it is obvious that the apparatus could be adapted
for any ordinary fuel such as wood coal or coke. Also that my improved con-
nections and utensils could be applied and used with an independant and
detached boiler of any ordinary kind.
That my invention may be more clearly understood I will now describe same
having reference to the accompanying drawings throughout which similar letters
serve to indicate similar parts:-
Figure 1, is a sectional elevation through centre of oven and boiler.
Figure 2, part of side view of boiler in section through the centres of the
steam-tight water filling joints and small cooking utensil.
Figure 3, plan of boiler.
Figure 4, showing cooking utensil with extension and detachable steam conduit
tube.
Figure 5, portion of small cooking utensil showing a side view of steam conduit
tube.
A, is the burner chamber opening into the heating chamber or flue, D), formed
by the inner wall of the boiler, C, being centrally recessed such recess increasing
fanwise in width from the base upwards and tapering off, or decreasing in depth
in its course upwards as shewn in Figure 2. This fan-shaped tapering recess
causes the flame and heated air to spread bringing about a more equal distri-
bution of heat throughout the stove. B, the interior of oven; C, the water
boiler attached by means of a bored flange, I, and bolts and nuts to, and com-
pleting the side wall of the oven, B; E, a cone-shaped funnel or water level
indicator with wire E¹, crossing centrally its inner diameter, El, being so placed
as to indicate the level to which the boiler may be filled, while steam issuing
D
07

page_text: from the funnel, E, serves to indicate that the level of the water in the boiler has
fallen below the bottom of the funnel and requires replenishing. F, (Figures 1,
2, and 3) inner and outer vertical ring flanges surrounding circular apertures in
the top of, and communicating with the interior of boiler, C, supplying the
steam to the interior of the steam cooking utensils, H, H', such outer ring
flange being somewhat higher than the inner ring flange, the condensation of
steam from the boiler automatically filling the space between such inner and
outer rings when connected to the utensils as hereinafter described thus forming
a steam tight water joint. The cooking utensil H, (Figures 1, and 4,) is con-
nected with the boiler by the interposition of a detachable steam conduit pipe
such as, G, the steam inlet aperture in the wall of the utensil, H, being covered
by, and opening into an elbowed conduit pipe permanently attached to, and
projecting from the outer wall of the utensil, the lower end of pipe, K', adjust-
ing loosely on, and over the outer end of such conduit pipe, G. The pipe, G,
having at such outer end an outer ring of increased circumference and enclosed
at its base forming a ringed flange similar to those on top of the boiler such
as, F, so as when it becomes filled with water automatically by condensation, a
steam tight water joint is formed, similar to that on the boiler top. A small
sized utensil has it's steam supplying aperture in its wall near the top sur
rounded by, and opening into a straight conduit pipe enclosed at the top and
projecting down the outer wall of the utensil to which it is permanently secured,
such conduit pipe, K, (Figure 5) projecting below the bottom of the utensil
which projection seats directly over the inner ring-flange on the boiler top thus
completing the joint for reception of the water. The intermediate dutachable
conduit pipe, G, is interposed to extend the connection to permit of the larger
utensil being seated at any practical distance from the boiler, say on the top
of the oven, 80 that the utensils directly connected to the boiler top
and the larger one connected by means of pipe G, may be grouped
on such stove top. The inner ring-flanges not in use are closed by
metal caps. The detachable conduit pipe, G, may be made adjustable to any
desired length by making it in two parts, one of sufficient length and size as to
pass firmly over the other and to slide thereon telescopically, which is obvious
and is therefor not shewn in the drawings. These steam cooking utensils are
also provided with a perforated false bottom, O, seating loosely on studs so that
the edible cooking therein may not come in contact with the water accumulated
by condensation. The oven is fitted with a flame and heat deflector such as, L,
also with flue at the top of oven, M, provided with an outlet, N: steam cooking
utensils may be provided to fit on top of utensils H, H', with steam inlet aperture
in their bottoms which are well known and form no part of my invention.
Accommodation for ordinary boiling utensils is provided by the extension table, J,
supplied with the necessary heat from the burner chamber, A.
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, For attachment to, and use in conjunction with a cooking oven or stove
such as, B; a vertical boiler with steam outlet apertures and ring flanges and
having it's inner wall centrally recessed such as, C, so as to form a heating
chamber or flue such as, D, as before described and illustrated in the accom-
panying drawings.
2. As a means for rendering the connection of a steam cooking utensil such
as H, H with the stove boiler such as, C, steam tight, an automatically filling.
water joint or joints as before described and illustrated.
3, For use as an extended connection of a steam cooking utensil such as, H,
with a stove boiler such as, C, an elbowed detachable steam conduit pipe having
its outer end surrounded by a ring flange such as, G, the inner end of such

page_text: pipe, G, connecting with such boiler and the outer end with such utensil so as to
be steam tight as before described and illustrated in the accompanying drawings.
4, For cooking by steam supplied by a boiler connected to a stove such as C;
steam cooking utensils provided with steam inlet apertures and permanently fixed
steam conduit pipes such as, K, K', as before described and illustrated in the
accompanying drawings.
5, As a baking, boiling, and steam cooking apparatus the combination of the
several parts herein before described and shewn in the accompanying drawings
lettered therein from, A to, O, both inclusive, fitted, applied and operating as
hereinbefore described and illustrated.
Dated this 27th day of December 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.