Year: 1886

page_text: Date of Application, 25th May, 1886.
Complete Left, 15th Feb., 1887.
Complete Accepted, 15th Mar., 1887.
1, HENRY THOMPSON, of No. 33, Alwyne Road, Canonbury, in the county of
Middlesex, Builder, do hereby declare the nature of this invention to be as follows:-
My said invention which relates to improvements in the construction of furnaces for
steam boilers and other purposes, consists first, of an improved door, and secondly, of
improvements in the construction and arrangement of the interior fittings of the
furnace, whereby a more complete combustion of the smoke and gases in their passago
from the fuel on the grate to the chimney is effected than is the case in furnaces
constructed in the usual manner.
The first part of this invention relates to the construction of a hollow furnace door,
in the upper part of the front plate of which is an aperture, or series of apertures, tho
extent of which is controlled by a plate or damper or other known means, for tho
admission of air to the interior of the door, and the air so admitted passes downwards
through the hollow door and in so doing becomes heated in which state it escapes into
the lower part of the furnace, at a point above the fire bars, through an aperture or
series of apertures in the lower part of the inner plate. I also arrange, in some
cases, an air inlet at the bottom of the front plate which inlet is provided with a
sliding plate by means of which it may be closed or more or less opened, as desired.
The draught of air through the door as hereinbefore described will tend to keep tho
outer surface of the door cool and thus, to a great extent, prevent the radiation of
heat therefrom.
The improvements constituting the second part of this invention are as follows:-
I form the grate of a series of hollow fire bars, the front ends of which are open
to the air, the admission of which thereto is regulated by any suitable contrivance for
controlling the size of the mouths of the said fire bars, as, for instance, a sliding
slotted plate, or, in some cases, I provide a number of separate plates, each having a
series of apertures therein. The apertures in each plate differ in size, and I arrange
in front of the mouths of the bars a plate having apertures of such a size as will
admit the requisite amount of air. When the quantity of air required is greater or
less, I remove the said plate and substitute therefor a plate having a series of larger or
smaller holes, as the case may be. The rear ends of the fire bars open into the space
[Price 8d.]

page_text: at the back of the bridge. The back of the ash it is closed by the lower portion of
the bridge or by a separate plate, the same being provided with a door to facilitate the
cleaning out of the space beyond. The bridge is made solid, or, in some cases, the
top part thereof is formed of a number of projections the spaces between the same
extending from the front to the back and downwards from the top nearly to the grate.
When the upper part of the bridge is made separate from that part which is below
the grate it is constituted of a number of blocks of fire clay or other suitable
material arranged within a box at such a distance apart that spaces of the roquired
size exist between the upper portions thereof. The lower ends of the said blocks are
made so as to fill the space within the box. When constructed in this manner, the
bridge may easily be moved as desired for repairing or any other purpose.
From the top of the fire tube or flue at a point behind the last mentioned bridge
there projects a baffle, furnished, in some cases, at its lower edge with a number of
projections the spaces between the same passing from the front to the back of the
said baffle. At a further distance within the fire tube and at the rear of the baffle
I arrange a vertical baffle plate of fire clay or other material across the centre of the
fire tube, the upper and lower edges of which plate are, in some cases, formed with
projections having spaces between them as hereinbefore described. Air is admitted
to the furnace through apertures arranged for that purpose at the door and at the front
of the ash pit and means are provided for regulating the amount admitted, for
instance, in some cases, I employ a sliding slotted plate, as will be well understood.

page_text: I, HENRY THOMPSON, of No. 33 Alwyne Road, Canonbury, in the county of Middlesex,
Builder, 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 tho
following statement:-
My said invention relates to improvements in the construction and arrangement of
the interior fittings of furnaces for steam boilers and other purposes, for instance tho
furnaces of bakers' ovens, whereby a more complete combustion of the smoke and
gases in their passage from the fuel on the grate to the chimney is effected than is the
case in furnaces constructed in the usual manner.
I form the grate of the furnace of a series of hollow fire bars, the front ends of
which are open to the air, the admission of which thereto is regulated by any suitable
contrivance for controlling the size of the mouths of the said fire bars, as, for
instance, a sliding slotted plate, or, in some cases, I provide a number of separate
plates, cach having a suitable aperture therein. The aperture in each plate differs in
size, and I arrange in front of the mouths of the bars, a plate having an aperture of
such a size as will admit the requisite amount of air. When the quantity of air
required is greater or less I remove the said plate and substitute therefor a plate
having an aperture of larger or smaller dimension as the case may be. The rear
ends of the fire bars open into the space at the back of the bridge or into a passage
through the latter to the back of it. The back of the ash pit is closed by the lower
portion of the bridge, or, by a separate plate the same being provided with a door to
facilitate the cleaning out of the space beyond. The top of the bridge is made
straight, or, in some cases, the top part thereof is dentated or serrated. When the
upper part of the bridge is made separate from that part which is below the level of
the grate it is, in some cases, constituted of a number of blocks of fire clay or other
suitable material arranged within a box. The lower ends of the said blocks are mado
so as to fill the space within the box. When constructed in this manner,
the bridge
may easily be moved as desired for repairing or any other purpose.
In some cases, instead of forming the whole of the grate of hollow fire bars I make
some of the bars solid.
From the top of the fire tube or flue at a point behind the last mentioned bridge
there projects downwards a baffle, or inverted bridge, the lower edge thereof being, in
some cases, dentated or serrated. At a further distance within the fire tube and at the
rear of the baffle I arrange a vertical baffle plate of fire clay or other suitable material
across the centre of the fire tube, the upper and lower edges of which plate are, in
some cases, dentated or serrated. In some cases, the last mentioned baffle is extended,
on the lower side, to the bottom of the furnace flue or tube. Air is admitted to the
furnace through apertures in the door, means being provided for regulating the
amount admitted, for instance, in some cases, I employ a sliding slotted plate, as will
be well understood.

page_text: I will now proceed to refer to the accompanying drawings from which the nature of
my said invention will be more clearly understood. Figure 1. is a front view of a.
furnace constructed in accordance with this invention, and Figure 2. is a vertical
longitudinal section of the same in which the baffle e. is shown placed across the
centre of the flue, whilst in Figure 3. the said baffle is illustrated extending
downwards to the bottom of the flue. In the last two Figures the bridge is shown
above the ends of the fire bars and the back of the ash pit is closed by a plate as
herein before mentioned. The same letters of reference indicate like parts in all the
Figures. a. are the hollow fire bars, b. is the bridge at the back of the furnace.
a plate for closing the opening through the plate or bridge at the back of the ash pit,
d. is a baffle projecting from the top of the furnace tube or flue, shown at Figure 4.
which is a cross section of a furnace through the line ... Figure 2. and e. is the
baffle which is placed behind the same and which is illustrated in Figure 5. the same
being a cross section through the line y. y. Figure 2.
c. is
The action of furnaces constructed as hereinbefore described is as follows, the bridge
and battles are referred to as having straight edges, but the edges are, in some cases,
dentated or serrated as hereinbefore stated.
The fire having been lighted on the grate the smoke and other products of
combustion pass over the bridge b. and are directed downwards by the baffle d. when,
coming into contact with the heated air escaping from the inner ends of the hollow fire
bars, they become mixed therewith and the process of combustion is continued, thence
passing below the baffle d. they come into contact with the before mentioned battle
plate e. and finally escape through the spaces between the upper and lower edges, or
between the upper edge thereof, as the case may be, and the fire tube, to the chimney.
The before mentioned dentated or serrated edges, when formed at the top of the bridge,
and at the edges of the baffles tend to effect a more thorough mixture of the heated
air and the partly consumed products of combustion. During the passage of the
products of the combustion through the space between the bridge at the end of the
grate and the baffle plate e. the whole, or nearly so, of the smoke is consumed.
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 I do not desire to
claim hollow fire bars, nor the arrangement of baflies in the flues of furnaces, generally,
but that what I claim is :--
The combination of the hollow fire bars, such as, a., the bridge,-such as, b., and the
baffles, such as, d. and e., constructed and arranged so as to form a furnace of an
improved character, substantially as hereinbefore described.
VAUGHAN & SON,
Agents for the Applicant.