Improvements in the Construction of Fire Doors for Boiler Furnaces.
Year: 1894

page_text: Date of Application, 12th Dec.. 1894
Complete Specification Left, 11th May, 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Fire Doors for
Boiler Furnaces.
I GEORGE HENRY PILLING of 25 Dale Street Bacup in the County of
Lancaster, Mechanic, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the construction of the fire doors of boiler furnaces,
the objects of the invention being to effect a more perfect combustion of the fuel
and to consume or prevent the formation of smoke whereby a great economy is also
effected in the amount of fuel consumed.
For the purposes of my invention, where the door is of the usual box-like form
with a perforated plate at the back next to the furnace, instead of allowing the air
to pass direct through the perforations into the furnace, I place behind the ordinary
perforated plate a plain plate so as to close the perforations, but preferably I make
the door with the back plate solid. In either case I provide the door with
perforations at the top and bottom so that the air is caused to divide into two
currents and pass through the top and bottom perforations into the furnace.
The current of air admitted at the top is thrown direct against the crown of
the furnace, and the bottom current is thrown onto the dead-plate, and the con-
sequence that almost immediately after firing the whole space of the furnace
above the fuel becomes filled with flame and no smoke is allowed to pass into
the chimney, whereby a great saving in the quantity of fuel required is also
effected.
In some cases I prefer not to have a perforated plate at all at the back of the
door, but to make the back plate plain or solid and to perforate the top and bottom
sides only of the box, placing baffle plates of sheet or cast metal inside the
box in such a manner that the current of air cannot pass directly through these
holes, but first strikes against the central portion of the solid back plate, then
divides and passes upwards and downwards to the top and bottom perforations and
thence into the furnace as before.
Dated this 11th day of December 1894.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
Improvements in the Construction of Fire Doors for
.Boiler Furnaces.
1 GEORGE HENRY PILLING of 25 Dale Street Bacup in the County of
Lancaster, Mechanic, 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 the construction of the fire doors of boiler furnaces,
the objects of the invention being to effect a more perfect combustion of the fuel,

page_text: and to consume, or considerably reduce the formation of smoke, whereby a great
economy is also effected in the amount of fuel consumed.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the sheet of drawings hereunto annexed and the following explanation thereof.
Fig. 1 on the drawing is a vertical longitudinal section of a boiler furnace and fire
door showing the application of my invention thereto and Fig. 2 is a horizontal
section of the same as I should apply it to an existing fire door, and Fig. 3 is a
vertical section of a slight modification thereof.
C
a shows part of the furnace, the fire bars the dead plate and d the fire door.
For the purposes of my invention where the door is of the usual box-like form
(as shown at Figs. 1 and 2) with a perforated plate d' at the back next to the
furnace, instead of allowing the air to pass direct through the perforations into the
furnace place behind the ordinary perforated plate a plain plate e so as to
close the perforations; but preferably in new furnaces I make the door with the back
plate d solid as shewn at Fig. 3.
1
In either case provide the door with perforations at the top and bottom so
that the air is caused to divide into two currents and pass through these top and
bottom perforations into the furnace. The current of air admitted at the top
is thrown direct against the top g of the door frame whence it issues beneath the
crown of the furnace, and the bottom current is thrown onto the dead-plate c, and
the consequence is that almost immediately after firing, the whole space of the
furnace above the fuel becomes filled with flame, the current of air making a
circular motion among the flames, and a considerably reduced quantity of smoke
is allowed to pass into the chimney, whereby a great saving in the quantity of fuel
required is also effected.
In some cases as before mentioned I prefer not to have a perforated plate at all
at the back of the door but to make the back plate plain and solid, and to perforate
the top and bottom sides only of the box as shown at Fig. 3 in which case I prefer to
place baffle plates of sheet or cast metal inside the box in such a manner that the
current of air cannot pass directly upwards and downwards through the
perforations, but first strikes against the central portion of the solid back plate d",
and then divides and passes upwards and downwards to the top and bottom
perforations and thence into the furnace as before.
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 what
I claim is :-
First. In a box-like fire door for a boiler furnace with a perforated back the
combination of a plate for closing such perforations, with perforations in the bottom
and top sides thereof.
Secondly. In a box-like fire door for a boiler furnace, the combination with a
solid back of perforations in the top and bottom sides thereof, and
Thirdly. In a box-like fire door for a boiler furnace having a solid back and
perforations in the top and bottom sides of baffle plates to cause the air to strike
direct against the solid back plate and then to divide and pass through the top and
bottom perforations into the furnace.
Dated this 10th day of May 1805
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.