A Semi-portable Oven for use with Ranges, and which may be employed for Heating and Circulating Air.
Year: 1892

page_text: Date of Application, 25th Aug., 1892-Accepted; 1st Oct., 1892
COMPLETE SPECIFICATION.
A Semi-portable Oven for use with Ranges, and which may be
employed for Heating and Circulating Air.
I, OTTO SCHULZE, of 44 Rathenowerstrasse, Berlin, in the Kingdom of Prussia
and German Empire, Merchant, do hereby declare the nature of this invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to a semi-portable oven which may be employed in the
ordinary way for baking, and which may also be used for generating and circulating
vapours, and for heating and circulating air, and which adapted for use with
existing cooking and kitchen ranges as an addition thereto.
The oven consists of two chambers preferably constructed of iron, which fit one
within the other, leaving a space between them through which the hot gases from
the fire in the range or similar source circulate constantly, the inner chamber being
thus effectively heated and isolated from the outer air. It is preferred to arrange
a tube through which communication between the interior of the inner chamber and
the outer air may be effected. In this tube there may be a door or valve, and
above it a fan. The space around the inner chamber is divided by a vertical
longitudinal partition which also divides a short connecting tube through which the
gases from the fire enter and leave the space. These gases pass upward on one
side of the partition, pass over and around the inner chamber, and leave on the
opposite side of the partition to that on which they entered.
If a vessel of water or other liquid be placed in the oven, and the tube door be
opened, the liquid will be vaporised, and the vapours will pass out through the
tube into the room.
If the oven doors be opened, and the door or valve in the
tube be also opened, then the hot air in the inner chamber will ascend through
the tube, and its place be taken by the external air passing through the open door-
way, and thus a continuous circulation of warm air will be maintained.
I will more particularly describe my said invention with reference to the accom-
panying drawings.
Figure 1 is a front view;
Figure 2, a longitudinal section taken along the line t-t-a, Figure 1 i and
Figure 3, is a transverse section taken along the line y-y, Figure 2.
The oven consists of two similar iron chambers A I, of which I is smaller than
A, and fits within it, leaving between them an air space or jacket.
?"
The smaller chamber is supported at the back, by a pin or stud Z, which fits into
a hole formed in the boss m, on the back of the outer casing. In the front, the
inner chamber is supported by a framing, which may be constructed of channel
iron and be fitted within and secured to the inner front edge of the outer casing A.
The flap door t, is secured to the framing by means of hinges s.
In the inner
chamber, at a short distance from the front, there is a slightly projecting part c,
against which an inner loose door o, fits. This door is provided on its outer side
with a spring bow h, and a knob, against which the outer door presses when it is
closed, thus causing the door o to make a tight joint against the projection c.
air space between the doors acts as an insulator for the heat.
The
The space formed between the outer casing A, and the chamber I, is divided
longitudinally into two parts by the partition p, which is constructed of iron plate.
In Figure 2, this plate is shewn shaded with open diagonal lines to shew its form
more clearly. It has an L-form, one of its limbs being below, and the other at
the back of the chamber I, and a projecting part at about the mid length of the
bottom limb, which passes through and divides the short connecting pipe a.
This
projection from the partition thus produces two openings in the connecting pipe

page_text: which form respectively the inlet e and the outlet r, as indicated by Figure 3. The
short connecting tube a, has such dimensions that it will fit within the ordinary
circular openings in the top plate of an ordinary kitchen range.
When the oven is
placed upon the range with the tube a in communication with the fire or with a flue
leading therefrom, the hot gases from the fire enter through e, circulate through
the space around the chamber 1, and finally leave by the outlet .
A tube l, may be constructed and arranged in such a manner as to place the
interior of the oven in communication with the outer air as shewn by Figures 1
and 2. The passage of this tube is controlled by the door or valve shewn by
Figure 2, which may be opened or closed by means of the handle K, Figure 1. At
the upper part of the tube there may also be arranged the small fan , which will
indicate by its rotation whether and at what speed the hot air or the vapour is
escaping from the oven.
If the oven be required for use in generating and distributing vapour, the liquid
from which the vapour is to be evaporated is placed within the chamber 1, and the
doors o t, are closed, and the door in the tube is opened.
If the oven be required to be used for heating and circulating air, the oven doors
are opened, as is also the tube 1. The heated air in the chamber I escapes through
the tube l, and is replaced by cooler air from the outside entering through the open
doorway.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
1. A semi-portable oven constructed and arranged substantially as and for the
purposes hereinbefore described and as illustrated by the accompanying drawings.
2. A semi-portable oven adapted to be used with existing kitchen ranges and
consisting of an inner chamber and an outer casing with the space between them
divided vertically and communicating with the fire or flue through a short
connecting tube also divided vertically to form an inlet and an outlet, constructed
and arranged substantially as herein before described and as illustrated by the
accompanying drawings.
Dated this 24th day of August A.D. 1892.
WILLIAM E. HEYS,
Agent for the Applicant.