Improvements in or Appertaining to Furnaces.
Year: 1885

page_text: Improvements in or Appertaining to Furnaces.
I, WILLIAM PHILLIPS THOMPSON, Fel. Inst. P.A. of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, in the County of Lancaster, and
323 High Holborn, in the County of Middlesex, Civil Engineer, do hereby declare
the nature of this invention (a communication from abroad by Absalom Backus
Junior, of the City of Detroit, County of Wayne and State of Michigan, United
States of America, Inventor) and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
The object of this invention is to provide an improved furnace designed to secure
a more thorough combustion of the coal thereby economising the fuel, preventing
smoke and securing the most thorough utilization of the heat.
This invention consists in the combinations of devices and appliances hereinafter
specified and more particularly pointed out in the claims.
In the drawings Figure 1 is a longitudinal section of a device embodying the
invention.
Figure 2 is a front section.
The invention is carried out as follows:-
A represents a boiler B. the combustion chamber; C a rear bridge wall; D. a
smoke flue E. the stationary grate supported upon cross bars e, e¹, or otherwise;
F is a dumping grate in the rear of the stationary grate, said grate being pivoted
at its rear end as shown at f.
F¹ is a knee joint lever having a pivotal connection with the front end of said
dumping grate and provided with an operating bar G the construction being such
that when said lever is forced inward the grate will assume the position shown in
dotted lines Figure 1.
It is obvious that by the use of this dumping grate in the rear of the grate E
the clinkers may be readily removed without disturbing the operation of the
furnace or impairing the combustion of the fuel, the clinkers being crowded to the
rear end of the stationary grate where they readily fall into the ash pit H when
the rear grate is dumped.

page_text: I is the front wall of the combustion chamber.
may be fed to the grate.
Ja door through which fuck
K is the improved arch located in the front of the combustion chamber between
the grate and the boiler dividing the combustion chamber so as to form a coking
oven B¹ in the front thereof into which the fuel first enters and after being coked
therein is forced back upon the rear of the stationary grate where the process of
combustion is completed.
The location of this arch above the front portion of the grate in the combustion
chamber obviously confines the volatile products of combustion upon the fuel bed
and thereby secures thorough combustion preventing the escape of smoke, the
waste of fuel thereby and the annoyance arising therefrom.
The arch K is inclined from the front toward the rear, so as to narrow the
throat at its rear end between the coking oven, and the rest of the combustion
chamber and secure the thorough combustion of the fuel gases at the same time
the inclined arch K prevents cold air from coming in contact with the boiler when
the door is opened for the admission of fuel or otherwise, and the heated air is
permitted to circulate in the combustion chamber above said arch and under the
boiler:
་.
This construction whereby the arch is caused to decline from the front wall
down toward the grate permits a free and unimpeded radiation from the bed of
fuel directly back over the arch, against the under surface of the boiler.
So also by the construction shown the underneath surface of the arch is smooth
and unbroken from the front wall backward to the throat through which the fuel
is forced into the rear portion of the combustion chamber, there is therefore no
downward projection of any kind to obstruct the free passage of the coking fuel as
it is shoved forward out of the coking oven into the combustion chamber nor
which might be struck by the fireman's stoking tools, nor by the coal as it is
thrown into the coking oven. ri
When the furnace is provided with two doors the combustion chamber is
preferably provided with a longitudinal division wall L, dividing the combustion
chamber into two compartments each provided with an inclined arch K, said arches
being supported at their inner edges upon the wall L and upon their outer edges,
upon the side walls of the combustion chamber.
2
The draft for the combustion chamber may be secured in any desired way: the
fuel doors may be left open or adjusted to permit the entrance of air first to the
coking chamber with good results.
This inclined arch K may be built in any suitable manner, as for instance, of
arch brick, although the invention is not confined thereto, nor to any particular
manner of supporting the same in the combustion chamber. The front of said
inclined arch K abuts against the front wall I although it may be extended
downward at the rear of the door.
The front wall I supports the forward end of the boiler, the combustion chamber
being located entirely underneath the boiler, coking oven and all. The front door
to the combustion chamber may be left ajar to furnish draught. By the construction
of the grates above described no cooling of the combustion chamber takes place in
cleaning the grates.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is
1. In a furnace an inclined arch K located in the front of the combustion
chamber above the grate, the front of said arch abutting against the front wall of
the combustion chamber beneath the top of said chamber forming a coking oven in
said chamber, substantially as described.
2. In a furnace an arch K inclined from the front toward the rear, said arch
located in the front of the combustion chamber above the grate and leaving an

page_text: open space above it and beneath the top of the combustion chamber, substantially
as described.
3. The combination in a furnace provided with a stationary grate E and dumping
grate F of an inclined arch K located in the front of the combustion chamber
between the grate and the top of said chamber, said arch abutting against the front
wall of the furnace and forming a coking oven in the front of the combustion
chamber, substantially as described.
4. In a furnace a combustion chamber located entirely underneath the boiler,
said chamber provided with an arch located in the front of the combustion chamber
above the grate, said arch abutting against the front wall below the top of said
chamber and inclined rearwardly toward the grate and forming a coking oven in
the front part of the combustion chamber and serving to hold the volatile products
of combustion upon the fuel bed in said coking oven, substantially as described.
5. In a furnace a combustion chamber located entirely beneath a boiler and
provided with a front wall supporting the front end of the boiler and in
combination therewith a grate and arch abutting against the front wall and
inclined rearwardly, said arch located in the front of the combustion chamber
between the grate and the boiler and forming a coking oven in the front part of
"said chamber, substantially as described.
6. In a furnace, the combination with a stationary grate of a dumping grate
located at the rear of said stationary grate, said dumping grate pivoted at its rear
edge and provided with a knee joint lever having an operating bar engaged
therewith, substantially as and in the manner described.