IMPROVEMENTS IN PORTABLE OVENS
Year: 1884

page_text: CORTELE
I ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex
Engineer do hereby declare the nature of this Invention for "IMPROVEMENTS IN
PORTABLE OVENS' and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
"
This Invention will be best understood by reference to the accompanying
Drawings in which
Figure 1 is a perspective view of this improved portable oven, and
Figure 2 is a longitudinal sectional view of the same.
Similar letters of reference indicate corresponding parts in both the Figures.
This Invention has relation to portable ovens and it consists in the improved
construction and combination of parts of the same as hereinafter fully described.
In the accompaning Drawings the letter A indicates the oven, and B the
furnace.
The oven is mounted upon detachable legs, C, and the furnace, the upper edges
of which are flanged, is supported by slides, D, in the bottom of the oven.
The oven consists of an inner casing, E, and an outer casing F, which are kept
at a certain distance from each other by sleeves G, through which pass nutted bolts, H
also passing through the casings.
The outer casing consists of double sheet metal with a layer of asbestos E¹
interposed which prevents the heat from radiating and, also, renders the oven more
durable.
The top of the oven is recessed, as shown at I, for the reception of a layer of
sand, which likewise prevents radiation of the heat.
J is a door through which ingress may be had to the interior of the oven, and
the inner and outer casings are connected around the opening.
The inner casing, E consists of a sheet metal shell, the bottom and lower parts
of the sides of which are covered by a layer of asbestos, E', and an outer shell of
sheet metal Eª.
In the bottom of the outer casing, where the furnace is suspended, is an opening
through which the fire is admitted into the oven, while a corresponding opening in
Di Adr

page_text: the inner casing is tightly covered by a plate, K, composed of a metallic frame L,
bolted to the inner casing, and holding a plate M of soap-stone or fire-brick.
This plate is placed at the point where the flame strikes the inner casing directly,
as the heat and immediate exposure would burn and destroy a sheet metal plate,
while it takes slower and less effect upon a stone plate.
The smoke and fire pass around the entire inner casing in the space N, between
the inner and outer casings, and are carried away at the top through a pipe, O.
A small pipe P provided with a damper serves to carry all smell of cooking or
baking out of the oven into the chimney, when desired, and to decrease the heat
in the oven.
.
It will be seen that by the oven having the outer asbestos lining and the sand-
bed on top, very little heat can escape by radiation and that the heat will circulate
evenly around the oven, the lower part of the oven being protected from the too
severe heat by the asbestos layer El and the fire plate K, so that there will be no
danger of articles placed in the bottom of the oven being burned.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is:-
1. In a portable oven, the outer casing consisting of doubled sheet metal lined
with asbestos; and the inner casing E of sheet-metal having its lower portion
protected by a covering E³ of sheet-metal and interposed layer E' of asbestos
substantially as described and illustrated.
2. The portable oven, consisting of the outer asbestos; lined casing F, inner
casing E, having protecting shells E', E fire plate K, door J, removable furnace B,
suspended in slides D detachable legs C, pipe O and smaller pipe P, all constructed
and combined substantially as and for the purpose set forth and shown.
Dated this 24th day of April 1884.