Improvements in and connected with Stoves and other Fire- places.
Year: 1898

page_text: Date of Application, 13th Aug., 1898
Complete Specification Left, 13th June, 1899-Accepted, 15th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in and connected with Stoves and other Fire-
places.
I, GEORGE MITCHELL, of 39, Victoria Street, Westminster, in the County of
Middlesex, Consulting Engineer, do hereby declare the nature of this invention
to be as follows:--
This invention relates to stoves, fire places and the like and consists of a
device by means of which rooms or apartments may be heated rapidly and
conveniently. This is effected by providing large heating surfaces in advan-
tageous positions suitable to permit of the radiation of heat into the interior of
The device may be rigidly attached to and form an integral part
of the stove or grate; but I preferably construct it separate from such stove or
grate, so that it can be applied or removed with facility and despatch.
the room.
As applied to an ordinary sitting-room stove or grate it consists of a sheet
iron or other metallic trunk or case closed on the top, bottom, sides, and one
end; and open. at the other end which is of such size and shape as to fit the
opening in front of the stove; so that when the open end of the trunk or case
is thrust into the opening in the stove or grate and temporarily affixed to the
same, it closes the whole of the space above the fire; thus acting as a blower"
and preventing access of oxygen except through the bars of the grate.
66
The case is divided into an upper and a lower passage by a diaphragm disposed
centrally therein, and this is cut away near the closed end of the trunk or case
and continued backwards beyond the open mouth of the case so as to entirely
close the throat of the stove or grate thus preventing the passage of heated
products of combustion directly from the grate to the chimney. When the trunk
is inserted in position for use, the heated products of combustion can obtain
access to the chimney only by passing into the lower passage of the trunk and
outwardly round the central diaphraghni plate and thence through the upper
return passage of the trunk into the chimney. The heated products of com-
bustion passing through this trunk which may project any required distance
into the room heats the casing of the trunk and the heat so acquired instead of
being allowed a free and direct escape up the chimney is by radiation from
the trunk or casing directly imparted to the atmosphere of the room. This is
of special use when fires are lit in the morning as the coals can be rapidly ignited
and the whole of the heat utilized to warm the room.
A damper or valve may be used to regulate the intense draught thus produced,
and the central diaphragm plate may be adjustable at the lower end to allow
all or only part of the heated products of combustion to pass through the trunk
when affixed.
The upper part of trunk may be used as a hot plate for purposes of cookery
and the projecting closed end may be supported by legs, suspenders or the like.
Dated this 10th day of August 1898

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Stoves and other Fire-
places.
I, GEORGE MITCHELL, of 39, Victoria Street, Westminster, in the County of
Middlesex, Consulting Engineer, 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 stoves, fire-places and the like and consists of a
device by means of which rooms or apartments may be heated rapidly and
conveniently. This is effected by providing large heating surfaces in advan-
tageous positions suitable to permit of the radiation of heat into the interior of
The device may be rigidly attached to and form an integral part
of the stove or grate: but I preferably construct it separate from such stove or
grate, so that it can be applied or removed with facility and despatch.
the room.
As applied to an ordinary sitting-room stove or grate it consists of a sheet
iron or other metallic trunk or case closed on the top, bottom, sides and one
end; and open at the other end which is of such size and shape as to fit the
opening in front of the stove, so that when the open end of the trunk or case
is thrust into the opening in the stove or grate and temporarily affixed to the
'same, it closes the whole of the space above the fire; thus acting as a "blower"
and preventing access of oxygen except through the bars of the grate.
The case is divided into an upper and a lower passage by a diaphragm disposed
centrally therein and this is cut away near the closed end of the trunk or case
and continued backwards beyond the open mouth of the case so as to entirely
close the throat of the stove or grate thus preventing the passage of heated
products of combustion directly from the grate to the chimney. When the trunk
is inserted in position for use, the heated products of combustion can obtain
access to the chimney only by passing into the lower passage of the trunk and
outward round the central diaphragm plate and thence through the upper
return passage of the trunk into the chimney. The heated products of com-
bustion passing through this trunk which may project any required distance
into the room heats the casing of the trunk and the heat so acquired instead of
being allowed a free and direct escape up the chimney is by radiation from
the trunk or casing directly imparted to the atmosphere of the room. This is
of special use when fires are lit in the morning as the coals can be rapidly ignited
and the whole of the heat utilized to warm the room.
A damper or valve may be used to regulate the intense draught thus produced
and the central diaphragm plate may be adjustable at the lower end to allow
all or only part of the heated products of combustion to pass through the trunk
when affixed to the stove or grate.
The upper part of the trunk may be used as a hot plate for purposes of cookery
and the projecting closed end may be supported by legs, suspenders or the like.
In order that my invention may be fully understood and ascertained I append
drawings in which:-
Fig. 1, is a vertical section of the simplest form of my invention.
Fig. 2, is a vertical section of an improved form.
X indicates the grate, the bars, Y. the hood or front of the upper part of
the stove and Z the chimney.

page_text: Referring now to Fig. 1; into the open space between the upper of the bars
and the lower edge of the hood Y, one end of the trunk or case A is inserted
and either permanently or temporarily fixed in the position shewn; in the
latter case preferably by means of a hinged part a one edge of which fits over
the lower edge of the hood Y when in use, but which can be turned back when
it is required to remove the device. The lower edge rests upon and engages
the top bar of the grate, and the space between this and the hood is completely
closed in by the trunk or case; thus ensuring that all the air used shall pass
through the grate.
The trunk is open to the chimney and to the grate at the end A and closed
at the outer end A2; and it is divided longitudinally by a horizontal diaphragm B
one end 6 of which reaches to the grate back, thus serving to prevent any of the
products of combustion passing direct to the chimney, while the outer end
is cut off so as to leave a passage C. By this means the products of combustion
when leaving the grate are caused to enter the lower half D of the trunk A,
pass horizontally along it, thence up through the passage C into the upper
part of the trunk whence they are free to escape into the chimney Z. The
course is indicated by the arrows.
The trunk or case may project any convenient distance from the stove, and
the heated products of combustion passing twice along the trunk or case, radiate
freely into the room or apartment instead of escaping directly into the chimney,
and thence to the atmosphere.
The principle remains the same in the device shewn in Fig. 2, but some
modifications in details are introduced. Thus the casing A has a projecting
upper part A and the diaphragm B a corresponding vertical extension B* and
thus the products of combustion are compelled to pass from the lower part D
through the vertical passage ( along the upper passage E and thence downwards
through the vertical passage E before reaching the chimney. This secures the
almost complete abstraction of the heat and renders it especially suitable for
use as a hot plate, the upper part of the projection A being used for this
purpose.
In the figure also is shewn a pivoted damper G capable of being operated from
the exterior by means of which the draught can be regulated at will; and a
sliding damper H which being operated by a handle can be caused to open a
direct communication from the grate to the chimney in case of this being
required.
It will be understood that although only two typical forms of my invention are
shewn yet it is capable of many modifications. Thus the trunk or case may be
of any suitable shape and pattern, and the partitions may be arranged at any
angle instead of horizontally or vertically or curved diaphragms may be
employed.
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. The combination with a stove or fire-place of a trunk or case projecting
from the front thereof and containing a diaphragm or diaphragms so arranged
that the heated products of combustion are deflected into and caused to pass
through the trunk in such manner as to heat the same, thus heating the room
or apartment into which it projects, substantially as described and shewn.
2. For attachment to the front of a stove or fire-place a trunk or case containing
a diaphragm or diaphragms so arranged that the products of combustion are
wholly or partly deflected into the passages thereby formed; before escaping
into the chimney, substantially as described and shewn.
3. The combination with a stove or fire-place of the trunk or case A, A,
the diaphragms B, B the hinged holder a and the dampers G and H all arranged

page_text: and operating substantially as shewn and described in the accompanying
drawings.
4. An attachment for stoves or fire-places constructed and operating, sub-
stantially as shewn and described in the accompanying drawings.
Dated this 12th day of June 1800
GEORGE MITCHELL.