Improvements relating to Stoves and Cooking Ranges
Year: 1891

page_text: Date of Application, 12th Sept, 1891
Complete-Specification-Left: 16th May, 1892-Accepted, 2nd July, 1892-
PROVISIONAL SPECIFICATION.
Improvements relating to Stoves and Cooking Ranges
We, GILBERT, ROBERT ANDERSON, (trading as Robert Mushet. & Co. Iron-
founders) and DAVID JACK, Foreman Pattern Maker, both of Bounington
Foundry, Leith, North Britain, do hereby declare the nature of this invention to
be as follows:-
•
This invention relates to stoves and cooking ranges and has for its objects to
enable such appliances to be used with a closed top to the fire or an open one,
alternately as occasion requires.
In carrying out our invention in connection with a coal fire cooking range of
ordinary type we construct an opening at the entrance to the chimney flue behind
the range, which opening is in line with the fire and level with the hob of the
range. We partially close the said opening with a vertical metal flap, or door,
hinged at the top corners to the adjacent framework but leaving a narrow space
on each side, right and left. These two narrow spaces, or upright. slits, afford
passage for the side plates of a moveable flue frame which is alternately enclosed
within the base of the chimney or drawn out upon the hob towards the back of
the fire; the operation of the said frame in a backward or forward direction—into
or out of the chimney-being the, chief movement necessary for connecting the
apparatus from an open to close fire, or close to open fire state.
The moveable flue frame consists of the aforesaid upright metal side plates—
right and left-which are united together by an embellishing frame or arched band
in front and a surrounding frame at the back; the front, back, bottom. and top of
the flue frame being open for flue purposes.
When the said moveable flue frame is pulled forward from the chimney, its side
plates bear against the vertically hinged door flap and cause it to assume a hori-
zontal position, covering the upper part of frame and converting it into a short
tunnel flue leading from back of firo to base of chimney.
The plate which covers over the fire can be removed by pushing it backward
beneath the hob and the products of combustion have then free passage from the
fire to the chimney through the improvised flue above described; the apparatus
being then an-"open fire" one.
When such a cooking range as we have just named is in operation with an open
fire we find it best to cut off all heat currents from the flues encircling the oven,
as such currents are then too sluggish to be of much service and have a. tendency
to cause the fouling of said flues with soot. We have therefore combined with the
hinder part of the moveable flue frame "above described, a damper, which covers
the opening leading from oven flue to chimney base when the said frame. is drawn
forward, and uncovers it when the said frame is pushed back into the chimney.
In order to reverse the action of the range the moveable flue frame must be
pushed back into the chimney, when the hinged door flap falls down by its own
weight into a vertical position, closing the entrance to the chimney, and the fire
cover is pulled forward from beneath the hob, thus restoring the apparatus to its
"close fire" form; the oven flue damper being moved, in the said process, so as to
leave the oven flue open, the heat currents from the fire proceed through the oven
flue before entering the chimney.
Dated this Tenth day of September 1891.

page_text: COMPLETE SPECIFICATION.
Improvements relating to Stoves and Cooking Ranges.
We GILBERT ROBERT ANDERSON (trading as Robert Mushet & Co., Iron-
founders) and DAVID JACK, Foreman Pattern Maker, both. of Bounington
Foundry, Leith, North Britain, 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 and cooking ranges and has for its objects to
enable such appliances to be used with a closed top to the fire or an open one,
alternately, as occasion requires.
In carrying out our invention in connection with a coal fire cooking range of
ordinary type we construct an opening at the entrance to the chimney flue behind
the range, which opening is in line with the fire and level with the hob of the
range. We partially close the said opening with a vertical metal flap or door
hinged at the top corners to the adjacent framework but having a narrow space on
each side, right and left. These two narrow spaces or upright slits afford passage
for the side plates of a moveable flue frame which is alternately enclosed within
the base of the chimney or drawn out upon the hob towards the back of the fire;
the operation of the said frame in a backward or forward direction-into or out
of the chimney-being the chief movement necessary for converting the apparatus
from an open to a "close fire," or close to "open fire" state; the "fire cover
being at the same time placed over the fire or removed therefrom.
"
The moveable flue frame consists of the aforesaid upright metal side plates-right
and left which are united together by an embellishing frame or arched band in
front and a surrounding frame at the back; the front, back, bottom and top of the
flue frame being open for flue purposes.
When, the said moveable flue frame is pulled forward from the chimney, its side
plates bear against the vertically hinged door flap and cause it to assume a hori-
zontal position, covering the upper part of frame and converting it into a short
tunnel Hue leading from back of fire to base of chimney.
The plate which covers over the fire can be removed in various ways, (sometimes
by pushing it backward beneath the hob,) and the products of combustion have
then free passage from the fire to the chimney through the improvised flue above
described, the apparatus being then an
66 open fire one.
"
When such a cooking range as we have just named is in operation with an open
fire we find it best to cut off all heat currents from the flues encircling the oven,
as such currents are then too sluggish to be of much service and have a tendency
to cause the fouling of said flues with soot; we have therefore combined with the
hinder part of the moveable flue frame, above described, a damper, which covers
the opening leading from oven flues into the chimney base when the said frame is
drawn forward, and uncovers it when the said frame is pushed back into the
chimney.
In order to reverse the action of the range and adapt it for "close fire" purposes
the moveable flue frame as previously described must be pushed back into the
chimney when the hinged door flap falls down by its own weight into a vertical
position, closing the entrance to the chimney and the fire cover is pulled forward
from beneath the hob or otherwise placed over the fire, thus restoring the apparatus
to its "close fire" form; the oven flue damper being moved into an upright position
against the hinder part of the chimney in the said process so as to leave the oven
flue open, when the heat currents from the fire can proceed through the oven flues
before entering the chimney.
In order that our invention may be fully understood and easily carried into
effect we have prepared the accompanying drawings in which:
Fig. 1, is a view in perspective of a metal chimney:

page_text: Fig. 2, is a side view in elevation shewing our improved flue arrangement with
flue piece partially drawn out ;-
Fig. 3, is a sectional, side view of our appliances with flue piece fully
drawn out;
Fig. 4, is a sectional sidą view of our appliances with flue piece pushed com-
pletely into the chimney; -
Fig. 5, is a view in perspective of our improved flue piece and back damper ;
Fig. 6, is a perspective view of the said back damper removed from the
apparatus;
Fig. 7, is a back view in perspective of our improved flue piece without the
said back damper ;.
Fig. 8, is: a front view in elevation shewing the combination of the chimney and
vertical flap hinged thereto.
Similar letters of reference and numerals are employed throughout these illus-
trations to indicate corresponding parts.
j
We have; for convenience, limited these drawings to the illustration of our
improvements when combined with the cast metal chimney of a stove or cooking
range; Figs. 3 and 4 representing them fixed upon. a hob or hot-plate, M,.in line.
with a fire box such as K, Fig. 3.
These appliances are not intended, solely for combination with a cast metal
chimney such as that marked A in these drawings. The only part of the chimney
which is essentially required for combination with our improvements is the front
covering plate thereof, marked B in the drawings, to which plate the vertical flap C
is hinged....
In carrying out our invention, in connection with a stove or cooking range of
the class before described, we construct the metal chimney similarly to that
marked A in the drawings, having a flue opening D, Fig. 1 near to the fire space,
which aperture is closed or opened by means of the vertical metal flap suspended
across it. The said flap, C, which is smaller than the opening D, Fig. 8, is furnished
with two protruding pins, c, at the right and left upper corners, for insertion in
the sockets E, E, Fig. 1. The skeleton formed portable flue piece shown in Figs. 5
(front view) and 7 (back view) is inserted in the lower part of the chimney as
shewn in Figs. 2. 3. and 4 and the flap C covers, alternately the top or the front of
it according as the flue piece is drawn out from or pushed back into the chimney.
When the Hue piece is pushed back fully into the chimney, the flap C, as shewn
in Fig. 4 hangs vertically between the front piece F and the cam shaped
flanges G.
In drawing the flue piece forward, the flanges G, bear against the back of the
flap C and elevate it, as shewn in Fig. 2, until it lies horizontally upon the top of
them, forming a roof plate for the flue piece as shewn in Fig. 3. When the
apparatus is fitted together upon the stove the flue piece cannot be fully drawn out
and removed from the chimney, as the projecting back flange f', Figs. 3. 4. 5 and 7
is larger than the front aperture D, Fig. 1, and acts as a stop to prevent its complete
withdrawal.
In Fig. 6 we have shewn the form of our back damper plate H, with claws ¹
for enabling this damper to rest upon the bar J, Figs. 3. 4 5 and 7, and travel back
and forward with the flue piece. The upper part of the plate H is shaped suitably
for bearing against the back wall of the chimney so that it may rise vertically
(Fig. 4) or assume a sloping position (Fig. 3) according as the flue piece is moved
in or out.
When the flue piece is drawn out from the chimney the smoke and other currents
proceeding from the fire box K have free access to the chimney A as indicated by
the arrows, (Fig. 3), the damper plate H covering over the aperture L at the
chimney base. In Fig. 4, which shews the flue piece pushed back into the chimney,
the aperture L is open and the currents proceed, as shewn by the arrow, through
it and the open top of the flue piece.
From the foregoing description it will be seen that a stove or cooking range

page_text: furnished with the skeleton framed flue piece Fig. 7. combined with the plate E
and the flaps C and H as herein shewn, can be used alternately with an open top
to the fire or a closed one if operated as described; the plate which covers over the
fire (the "fire cover") being moved as aforesaid, for these purposes, conjointly with
the moveable flue piece Fig. 7.
We are aware that appliances have been in use, prior to our invention for
combined close and open fire purposes in connection with stoves and cooking
ranges wherewith were combined portable and skeleton framed flue pieces with
cam shaped flanges for engaging with damper plates or flaps; vertical flaps hinged
to the chimney front: plate, skirting or other part, also back dampers, but each
arrangement, as a whole, differing from our invention; it will therefore be under-
stood that we do not claim, broadly, either a skeleton framed flue piece or -such
flaps, as our invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
"
In a stove or cooking range the combination therewith of moveable flue devices
-constructed, and adapted for operation, all substantially as herein described and
shewn in the drawings, for the purposes specified.
. Dated this Thirtieth day of April 1892.
JOSEPH LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.