Improvements in the Construction of Furnaces.
Year: 1890

page_text: Date of Application, 7th Nov., 1890
Complete Specification Left, 16th Mar.. 1891—Accepted, 18th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Furnaces.
We, BARTLETT WRANGHAM WINDER, of Wharncliffe Road, Manager, TOM
NORMAN, of Birch Road, Engineer, and HARCOURT TASKER SIMPSON, of New
Machon Bank Road, Steel Manager, all of Sheffield, in the County of York, do
hereby declare the nature of our invention to be as follows:-
This invention of improvements in furnaces has for its object the more perfect
combustion of unconsumed carbon commonly called smoke.
We propose in carrying out our invention as applied to the furnace of a steam
boiler, for example to build the bridge of the furnace upon a box casting made to
fit the lower part of the flue and placed at the end of the firebars, and upon which
the firebars may rest if desirable.
The casting or bridge support is provided with a hinged door or air valve, which
can be opened and closed, and retained in position by means of a lever or rod,
extending to the front of the boiler, provided with a rack or other means of fixing
it as desired.
At the back of the bridge proper, and say for example about nine inches from it,
we erect a second bridge or battle wall; this baffle wall is carried up higher than
the bridge proper, and the upper part is curved or arched over towards the bridge,
so as to form a mouth open to the furnace, of the full width of the bridge.
When the furnace is fed with fuel and the furnace door is closed, the air-valve
or door under the bridge is opened to the desired extent to admit air from the front
of boiler, into the chamber between the bridge and the baffle-wall.
This air becomes highly heated and gaseous in passing between the walls of the
chamber, and issues with considerable force from the mouth, meeting and mixing
with the flame and unburnt carbon and gases, and causing complete combustion.
Although we have described our invention as applied to a steam boiler furnace
only, it can readily be adapted to other furnaces as will be readily understood.
Dated the 6th day of November 1890.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in the Construction of Furnaces.
We, BARTLETT WRANGHAM WINDER, of Wharncliffe Road, Manager, TOм
NORMAN, of Birch Road, Engineer, and HARCOURT TASKER SIMPSON, of New
Machon Bank Road, Steel Manager, all of Sheffield, in the County of York, 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 of improvements in furnaces has for its object the more perfect
combustion of unconsumed carbon commonly called smoke.
The annexed sheet of drawings illustrates our invention as applied to the furnace
of a steam boiler of ordinary construction.
Fig. 1, is a broken longitudinal section of the flue of a steam boiler, showing the
bridge and backwall.
Fig. 2, is a view of the interior of the flue showing the bridge, top of the
backwall, and door for admitting air.
Similar figures of reference indicate similar parts, in either of the figures.
[Price 6d.]

page_text: In carrying out our invention as applied to the furnace of a steam boiler, such as
that shown in the illustration, for example, we build the bridge proper A, upon a cast
iron frame, or box-casting B, made to fit the form of the lower part of the flue C,
and fixed at the end of the firebars D, and upon which the said firebars may rest
if desirable.
The casting or bridge support B, is provided in its front plate or wall E, with a
hinged door or valve F, which can be opened and closed, and be retained in either
position or in any intermediate position (as that shown) by means of a rod G,
extending to the front of the boiler, and having a rack H, or other like means by
which it may be secured.
At the back of the bridge proper A, and preferably at about eight inches from
it, we erect a second bridge, or backwall I, this backwall is carried up higher than
the bridge proper, and its upper part is arched over towards the bridge, and over-
hanging it a few inches, the space between the two parts forming a mouth or
outlet J, opening towards the fire; and of the full width or thereabouts of the
bridge.
When the furnace is fed with fuel, and the furnace door closed, the door or air
valve F, under the bridge is opened to the desired extent, to admit the passage of
air from the front of flue C, into the chamber between the bridge and the
backwall.
The air in its passage down the flue under the firebars, and between the hot .alls
of the bridge and the backwall, becomes highly heated and gaseous, and issues with
considerable force from the mouth J, thus meeting and mixing with the flame and
unburnt carbon and gases, and causing complete combustion.
We do not bind ourselves to any of the sizes or proportions given or drawn, and
although we have described our invention as applied to a steam boiler furnace only,
it must be understood that it can be readily adapted to other furnaces.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is or may be performed, we declare that what
we claim is :-
1-As an improvement in the construction of furnaces, having for its object the
better combustion of unconsumed carbon, commonly called smoke; the combination
and arrangement of a bridge A, a backwall I, arched forward over the bridge, and
forming a mouth or air outlet J, with an inlet door or valve F, substantially as
hereinbefore described and illustrated.
2-In furnaces, the combination with the bridge proper, of a backwall built at a
little distance therefrom, so as to form an air-chamber between, and arched or
curved forward at the top, above the bridge, to form a mouth or air exit open
towards the fire; the air being admitted to the air-chamber by means of a door or
valve in the division wall under the bridge, substantially as hercinbefore described
and shown,
D
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.