Improvements in Furnaces or Fire Boxes for Locomotive Boilers, Traction Engines, and other purposes.
Year: 1895

page_text: · Date of Application, 30th Oct., 1895 .
Complete Specification Left, 13th May. 1896-Accepted, 18th July 1896
PROVISIONAL SPECIFICATION.
Improvements in Furnaces or Fire Boxes for Locomotive Boilers,
Traction Engines, and other purposes.
⋅
I, ANDREW PILLATT, of 2, Notintone Place, Sneinton, in the Town and
County of the Town of Nottingham Mechanical Engineer do hereby declare the
nature of this invention to be as follows:-
.
This invention relates to improvements in furnaces or fire boxes for locomotive
boilers, traction engines, and other purposes, and has reference more particularly
to those furnaces in which the hot air is drawn from the ash pit through laterally
perforated hollow fire bars, such as described in the Complete Specification
No. 13,3719.
The principal object of my present invention is to enable this hot air to be
brought into more intimate mixture with the furnace gases so as to obtain complete
and instantaneous combustion, ensure economy in the consumption of fuel,
prevent smoke, and keep the fire tubes perfectly clean without their having to be
swept out.
For the purposes of my invention, I arrange at the back of the furnace or fire
box, a bridge behind which is a space for the hot air drawn through the bars, and
upon which rests a baffler consisting of a hollow casing projecting into the furnace
or fire box. Above this baffler is arranged a baffle plate, extending across the
furnace or fire box, and having its lower edge in proximity to the baffler in such a
manner as to form a contracted passage, over the baffler, for the flame to pass to
the tubes.
The hot air passes up the space behind the bridge into the baffler and flows out.
through a slot, or its equivalent, extending almost the entire width of the said baffler,
and mixes in a very efficient manner with the fuel gases and products of combustion
flowing over the baffler through said contracted passage between the baffler and
the baffle plate. The front of the baffler is inclined and its upper edge, which
may be provided with a ridge or projection, projects above the level of the slot so
as to ensure the hot air flowing in the proper direction to mix with the fuel gases.
The baffler is preferably curved from side to side of the furnace or fire box, and
the top may also be curved from back to front.
Dated this 30th day of Antahan 1005
Improvements in Furnaces or Fire Boxes for Locomotive Boilers,
Traction Engines, and other purposes.
1, ANDREW PILLATT, of 2 Notintone Place, Sneinton, in the Town and
County of the Town of Nottingham, Mechanical 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, reference
[D077

page_text: being had to the accompanying drawings and to the letters and figures marked!
thereon, that is to say :-
This invention relates to improvements in furnaces or fire boxes for locomotive
boilers, traction engines, and other purposes, and has reference more particularly
to those furnaces in which the hot air is drawn from the ash pit through perforated
hollow fire bars of the kind described in the Specification of former Letters Patent
No. 13,37195.
The principal object of my present invention is to enable this hot air to be.
brought into more intimate mixture with the furnace gases, so
as to obtain
complete and instantaneous combustion, ensure economy in the consumption of
fuel, prevent smoke, and keep the fire tubes perfectly clean without their having
to be swept out.
For the purposes of my invention, I arrange at the back of the furnace or
fire box, a bridge, behind which is a space for the hot air drawn through the bars,
and upon which rests a baffler, consisting of a hollow casing projecting into the
furnace or fire box. Above this baffler, is arranged a baffle plate, extending across
the furnace or fire box, and having its lower edge in proximity to the baffler in
such a manner as to form a contracted passage over the baffler, for the flame to
pass to the tubes.
The hot air passes up the space behind the bridge, into the baffler, and flows
out through an opening, or openings, extending almost the entire width of the said.
baffler, and mixes, in a very efficient manner, with the fuel gases and products of.
combustion flowing over the baffler through said contracted passage between the
baffler and the baffle plate.
The invention will be readily understood on reference to the accompanying
drawings, in which :-
Fig. 1 is a vertical section of my improved furnace or fire box,
Fig. 2 a plan of the baffler, and
Fig. 3 a longitudinal section thereof.
a is the furnace or fire box, and a¹ the ash pit thereof. is one of the hollow
fire bars having air inlets & through which the heated air is drawn from the ash pit..
c is the bridge, which may be formed of cast iron, fire brick, or clay, and which
rests on the fire bars b, being held in place by projections 63 on the said bars, and
being supported, at its upper part, by rests c. d is the hot air space behind the:
bridge, into which the hollow bars b open. e is the hollow casing forming the
baffler and resting upon the bridge c. It is provided with an opening. e* for.
the entry of the heated air. f is the opening in the said baffler for the outflow of :
the heated air, this opening being in the form of a slot. g is the baffle plate, which
is arranged in the fire box above the baffler and extends down towards the baffler e,
so as to leave the contracted passage h between it and the baffle plate, at which the
heated air and products of combustion meet and mingle together.
The front of the baffler e may be formed as shown, and has a turned over edge el
which projects above the level of the slot, so as to ensure the hot air flowing in the
proper direction to mix with the fuel gases.
The baffler is preferably curved from side to side of the furnace or fire box, and
the top may also be curved from back to front, as shown in Figures 1 and 3.
The baffle plate g may be turned over and strengthened, as shown at g¹, or
otherwise.
The course of the heated air from the ash pit a' through the hollow fire bars b,
the space d, and the openings ex and f, is indicated by barbed arrows, and the
course of the products of combustion, both before and after they mingle with the
heated air at the contracted passage h, by barbed and feathered arrows.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A furnace or fire box provided with hollow fire bars opening into a space
"
'

page_text: behind the fire bridge, and having a hollow baffler, through which heated air
passes, arranged at the top of the fire bridge, substantially as described.
2. In a furnace or fire box, of the kind above claimed, the combination with a
hollow baffler, supported on the fire bridge and having an inlet and outlet for the
heated air, of a baffle plate arranged above said baffler so as to form a passage.
between them for the products of combustion and the heated air, substantially as
described.
3. My improvements in furnaces or fire boxes for locomotive boilers, traction
engines, and other purposes, substantially as hereinbefore described and as shown.
in the accompanying drawings.
Dated this 15th day of May 1896.
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 5ª Market Street, Nottingham,
Agent for the Applicant.