An Improved Boiler Furnace.
Year: 1890

page_text: Date of Application, 17th June, 1890
Complete Specification Left, 25th Feb., 1891-Accepted, 11th Apr., 1891
PROVISIONAL SPECIFICATION.
An Improved Boiler Furnace.
I, WILLIAM WILSON HORN, of the firm of Horn & Son, of 151, Strand, London,
Middlesex, Patent Agent, do hereby declare the nature of this invention, (a
communication to me from abroad by James S. Harkins, of Minneapolis,
Minnesota, United States of America, Inventor,) to be as follows:-
This my invention relates to an improved boiler-furnace, and has for its object
the greater production of heat with a small amount of coal consumed.
In my improved furnace, I construct the fire-box with hollow walls, closed in at
the top with openings from said wall to the atmosphere and to the fire-box.
These openings may be closed by a damper at will. The inner surface of the
before-mentioned wall is corrugated. Within the fire-box is an inner lining also
corrugated which forms with the corrugations on the wall a series of vertical or
diving flues.
The lower portion of the fire-box is provided with suitable furnace-bars, ash box,
and draught doors.
The products of combustion are carried off by means of a smoke flue which
passes around the boiler.
A steam pipe is adapted to deliver a spray of steam into the fire-box to promote
combustion.
The rear wall of the fire-box is constructed of a less height than the side walls,
and the space between the top of the rear wall and the under side of the boiler
plate may be closed by a damper.
Dated this 17th day of June 1890.
HORN & SON,
Applicant's Agents.
COMPLETE SPECIFICATION.
An Improved Boiler Furnace.
I, WILLIAM WILSON HORN, of the firm of Horn & Son, of 151 Strand,
London, Middlesex, Patent Agent, do hereby declare the nature of this inven-
tion, (a communication to me from abroad by James S. Harkins, of Minneapolis,
State of Minnesota, 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 my invention is to provide a furnace for generating heat which
will by means of its construction and the combination of its several parts consume
the fuel more perfectly, and at the same time obviate the use of what is commonly
termed a "smoke-consumer," thereby utilizing to the fullest extent the heating
properties of the fuel.
In the accompanying drawings, forming a part of this Specification,
Figure 1 is a longitudinal vertical section of a boiler and furnace embodying
my improvements.
Fig. 2 is a front elevation and partial vertical section of the same on
of Fig. 1.
Fig. 3 is a horizontal section on line of Fig. 1.
line
Y Y
In the drawings, 2 represents the outer or supporting wall; 3, a cross-wall

page_text: 5 represents a boiler supported upon the walls 3; having the smoke-flue 7 and
the head-opening 8, leading into tlie exit-flue 9: The front plate 10 is provided
with the door. 11, leading to the smoke-flue 7 of the boiler for cleaning-out
purposes, the fuel-door 13 for the admission of fuel, and the ash-door 13 for
removing the ashes from the ash-pit 4. In lie ash-door 15 are arranged draft-
openings 17 for the admission of air to the fire-box through the grate-bars 18, a
sliding damper 20 being arranged over the draft-openings 17 for regulating the
admission of air through said openings.
Directly under the front end of the boiler 5 is arranged the fire-pot 23, having
the double walls 25 and 26 on each side, and the rear preferably formed U-shaped,
the top being fitted up against the bottom of the boiler 5 on each side, while the
rear portion 27 and 28 is only carried up part way to the boiler, leaving an open
space 51 from said fire-pot back under the boiler, which may be closed by the
dampers 50. The rear wall 27 and 28 of the fire-pot is preferably set on an
incline toward the back part of the furnace. The inside walls 25 and 27 are
preferably corrugated, as shown in Fig. 3. An inner lining of fire-clay 30,
corrugated to register with the corrugations on the walls 25 and 27, is so arranged
as to form a number of openings or diving-flues 19 from the fire-box down on the
outside of the lining 30, and the inner walls 25 and 27, leading to the main exit-
flue 33, formed by the rear wall 28 and the bottom of the boiler 5 and the
ground 34 beneath said Blue being preferably lined with fire-brick 35, or other
suitable material.
In the front plate 10 are openings 37, leading into the opening 38 in the walls
of the fire-pot. The inner walls 25 on the side and the walls 27 and 28 in the
rear are provided with a series of holes 39 for the admission of air through the
openings in the walls into the fire-pot and through into the smoke-flue 33.
Leading from the steam-dome of the boiler or other suitable steam-receptacle is
a steam-pipe 40, which is preferably placed in the hollow wall of the fire-pot,
from which the end projects into the fire-pot for the admission of steam into
the same to facilitate the combustion of the gases before they have escaped from
the fire-pot.
The operation is as follows: Fuel being placed in the fire-pot 23 through the
door 13, it is ignited in the usual manner, the damper 50 being thrown down and
back, so as to make a direct draft to aid in starting the fire. The air coming in
through the openings in the ash-door 15 rushes up through the grate-bars, and the
fuel thereon supplying the necessary oxygen for the purpose of starting the fire,
the smoke and unconsumed gases passing out through the opening 51 into the
smoke-flue 33. When the fire is sufficiently started, the damper 50 is closed,
forcing the gases and products of combustion to find exit either through the
openings between the corrugations of the inner lining 30 and the inner walls 25
and 27 or back through the fuel and out into the smoke-flue 33 in the direction of
the arrows. The air, being admitted through the hollow walls of the fire-pot,
enters through the openings 39, furnishing an additional supply of air to the rising
gases, which are drawn down, ignited, and are carried off in the usual manner into
the smoke-flue 33, thence through the boiler-flues 7, and out of the exit-flue 9.
The fuel being supplied with a sufficient amount of oxygen is always alive, and
the gases which naturally arise from the fuel during combustion are carried
directly through the fuel and into the smoke-flue 33, whether the current be
directly toward the flue 33 or by way of the corrugated channels as they terminate
above the grate-bars 18.
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
1. The combination, in a furnace, of a fire-pot having its walls formed hollow
and connected to the outer air and provided with a series of openings leading from
the hollow wall into the fire-pot, à corrugated inner lining forming diving-flues,

page_text: with similar corrugations on the inner wall of said fire-pot, the grate-bars 18,
and the smoke-flue 33, substantially as described, and for the purpose specified.
2. The combination, in a furnace, of a fire-pot, an inclosing hollow wall, a
series of openings from said hollow wall into said fire-pot, openings leading into
said hollow wall from the outer air, a steam-pipe adapted to deliver a spray of
steam in said fire-pot, and the draft-openings 17, grate-bars 18, and smoke-flue. 33,
substantially as described.
3. The combination, in a furnace, of the fire-box 23, having the walls 25 and 26
on the sides formed U-shaped, the walls 27 and 28 at the rear formed U-shaped
and of a less height thau the side walls, and said walls being closed at the top,
forming a hollow space between them, said hollow space being connected by suitable
openings with the outer air and by a series of holes with the fire-pot 23, the
damper 50, and the smoke-flue 33, substantially as described.
4. The combination, in a furnace, of the fire-pot 23, having the side walls 25
and 26 and the rear walls 27 and 28, provided with the openings 39, a corrugated
lining 30, forming with similar corrugations on the walls 25 and 27, diving-flues,
the grate-bars 18, damper 50, and smoke-flue 33, substantially as described, and for
the purpose specified.
5. The combination, in a furnace, of the fire-pot 23, the walls 25, 26, 27, and 28,
having the series of openings 39, and the openings 37, damper 50, steam-pipe 40,
diving-flues 19, grate-bars 18, ash-box 4, draft-openings 17, and smoke-flue 33,
combined and constructed substantially as described, and for the purpose specified.
Dated this 25th day of February 1801
HORN & SON,
Applicant's Agents.