IMPROVEMENTS IN APPARATUS FOR REGULATING OR CONTROLLING COMBUSTION IN THE FURNACES OR STEAM BOILERS HAVING INTERNAL FLUES
Year: 1874

page_text: LETTERS PATENT to George Dingley; of Leicester, in the County of
Leicester, Manufacturer, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR REGULATING OR CONTROLLING COMBUSTION IN THE FURNACES
OR STEAM BOILERS HAVING INTERNAL FLUES."
PROVISIONAL SPECIFICATION left by the said George Dingley at the
Office of the Commissioners of Patents, with his Petition, on the
11th May 1874.
I, GEORGE DINGLEY, of Leicester, in the County of Leicester,
Manufacturer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR REGULATING OR CONTROLLING COMBUSTION IN
THE FURNACES OF STEAM BOILERS HAVING INTERNAL FLUES," to be as follows:-
My Invention has for its object to regulate or control combustion in
the furnaces of steam boilers having internal flues, in which flues the
furnaces are situated.

page_text: My said Invention consists of the improvements herein-after described,
whereby the draught passing through the flue or flues to the chimney
stack may be increased or diminished at pleasure, and the quantity of
air supplied to the furnace consequently regulated to the requirements
of the furnace, and the economical burning of the fuel thereby effected.
At the rear end of the flue I suspend a circular plate or disk of
somewhat less diameter than the said 'flue. The said plate or disc
chokes or impedes the passage of air through the said flue to the
chimney stack, the air passing between the edge of the plate or disc
and the flue. This plate or disc is carried by a vertical hollow arm
supported at top on a cross horizontal axis, so that the said plate or
disc, by the motion of the carrying arm on its axis, may be with-
drawn from the end of the flue and leave the flue open when required,
for cleaning or repair or other purpose.
The arm carrying the plate or disc can be fixed in either of the
positions described by a set screw or otherwise. The circular plate or
dise is made in two parts, the lower part being separated by a horizontal
division from the upper part. The said lower part is hinged or jointed
to the upper part, and when the said lower part is turned upon its
hinge out of a vertical position the passage for the air is increased in
area at the bottom of the said flue, and the draught of the furnace
consequently increased. The raising and lowering of the lower part of
the plate or disc is effected by a rod, which passes down the hollow arm
carrying the said plate or disc, and is jointed at its bottom by means
of a link to the lower part of the plate or disc. Or the lower part of
the plate or disc may rise and fall, so as to increase or diminish the
area of the passage through which the draught passes by a sliding
motion, the said sliding motion being effected by the rod in the hollow
arm supporting the plate or disc. The position of the said rod in the
hollow arm carrying the plate or disc may be fixed by a set screw or
otherwise.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Dingley in the Great Seal Patent Office
on the 5th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
DINGLEY, of Leicester, in the County of Leicester, Manufacturer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of May, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Dingley, Her special license
that I, the said George Dingley, my executors, administrators, and
assigns, or such others as I, the said George Dingley, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
APPARATUS FOR REGULATING OR CONTROLLING COMBUSTION IN THE FURNACES OF
STEAM BOILERS HAVING INTERNAL FLUES," upon the condition (amongst
others) that I, the said George Dingley, my executors or administrators,
by an instrument in writing, under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said George Dingley, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
My Invention has for its object to regulate or control combustion in
the furnaces of steam boilers having internal flues, in which flues the
furnaces are situated.
My said Invention consists of the improvements herein-after described,
whereby the draught passing through the flue or flues to the chimney

page_text: stack may be increased or diminished at pleasure, and the quantity of
air supplied to the furnaces consequently regulated to the requirements
of the furnace and the economical burning of the fuel thereby effected.
At the rear end of the flue I suspend a circular, oval, or other shaped
plate or disc to suit the flue, the said plate or disc being of somewhat
less diameter or size than the said flue. The said plate or disc chokes
or impedes the passage of air through the said flue to the chimney
stack, the air passing between the edge of the plate or disc and the
flue. This plate or disc is carried by a vertical hollow arm supported
at top on a cross horizontal axis, so that the said plate or disc, by the
motion of the carrying arm on its axis, may be withdrawn from the
end of the flue and leave the flue open, when required for cleaning or
repair or other purpose.
The arm carrying the plate. or disc can be fixed in either of the
positions described by a set screw or otherwise. The circular, oval, or
other shaped plate or disc, is made in two parts, the lower part being
separated by a horizontal division from the upper part. The said lower
part is hinged or jointed to the upper part, and when the said lower part is
turned upon its hinge out of a vertical position, the passage for the air
is increased in area at the bottom of the said flue and the draught of
the furnace consequently increased. The raising and lowering of the
lower part of the plate or disc is effected by a rod which passes down
the hollow arm carrying the said plate or disc and is jointed at its
bottom by means of a link to the lower part of the plate or disc. Or
the lower part of the plate or disc may rise and fall, so as to increase
or diminish the area of the passage through which the draught passes
by a sliding motion, the said sliding motion being effected by the rod. in
the hollow arm supporting the plate or disc. The position of the said
rod in the hollow arm carrying the plate or disc may be fixed by a set
screw or otherwise.
Having explained the nature of my Invention, I will proceed to
describe, with reference to the accompanying. Drawing, the manner in
which the same is to be performed.
Figure 1 represents in longitudinal vertical section a portion of a steam
boiler provided with an internal flue, to which my Invention is applied;

page_text: section of a portion of the same taken on the dotted line a, b,
of Figure 2.
Figure 4 is a modification of my Invention, as hercin-after explained.
The same letters indicate the same parts in the several Figures of the
Drawing.
c is the boiler, and d is the internal flue of the same; e is the
chamber at the back of the internal flue d in connection with the
chimney stack; f,f2, is the plate, disc, or valve suspended at the rear
end of the flue d, the said disc or valve being of, somewhat less diameter
or size than the flue. By an examination of Figure 1 it will be seen
that the air passing through the flued to the chimney stack is impeded
or choked by the said disc or valve f, f, the air and products of com-
bustion passing between the edge of the said plate or valve and the
sides of the flue, as indicated by the arrows. The current of heated air
passing through the flue is thus brought in close contact with the plates
of the flue. The full effect of the heated air is thereby given out to
the flue, and the water in the boiler economically heated.
The disc, plate, or valve f,f, is affixed to the vertical hollow arm g,
having near its top a cross horizontal axis h, by which the said arm g
is supported. The horizontal cross axis h turns in the bearings i, i.
'
By
this arrangement the disc, plate, or valve f, f³, may, when required, be
withdrawn from the end of the flued and made to take the position
indicated in dotted lines in Figure 1. When in this position the flue d
is open for cleaning, or repair, or other purpose.
in
The vertical army is fixed in either of the portions represented and
indicated by the screw nut o; k is a hand lever on the arm g, by which
it is moved. The said hand lever is provided with a curved slot P,
which slot the stem of the screw bolt o² works, the said bolt o² passing
through the said hand lever, and the arm or bracket q. To withdraw
the valve or disc f, f², from the flue d. the nut o is slackened, when by
lifting the hand lever k, its slot p permits it to take the position
indicated. The arm g is thereby turned on its axis h, and the valve or
disc ff, withdrawn from the flue, as indicated in dotted lines. The
nuto is then tightened, when the arm and valve are fixed in their
withdrawn positions.

page_text: . The girders or bearers 1, 1, are separate from the frame s, the vertical
arm q being cast on the said frames. There is a loose plate or man-
hole lid at t, which may be removed for cleaning the back chamber e.
The hand lever k is fitted on the horizontal axis h by means of a
hexagonal opening.
The bottom part 2 of the disc plate or valve f, f², is jointed to the
upper part by the hinge or joint f³. The bottom part f can by this
means be either brought into the same plane as the upper part ƒ, as
represented, or be turned upon its hinge f³ and thereby inclined to the
said lower part, as indicated in dotted lines in Figure 1. When the
lower part of the valve is in the position indicated, the passage for
the air is increased in area at the bottom of the flue d, and the draught
of the furnace consequently increased. The position of the lower
jointed part 2 of the disc or. valve f, f2, is adjusted by means of the
rod working in the hollow arm g, the lower end of the said rod / being
jointed by the link m to the said lower part 2 of the disc or valve. The
adjusted position of the rod and lower part of the valve is effected by
the screw box or hand wheel ǹ on the screwed end of the rod 7. By
turning the said screw box or hand wheel n in one or other direction,
the said rod is raised or lowered in the hollow arm g and the position
of the jointed part 2 of the valve, with respect to the fixed part f
adjusted.
It will be seen, by reference to Figure 1, that the inner rod 1, by
which the lower part 2 of the valve is adjusted, is effectually protected
from the action of the fire by the cast-iron hollow arm 9, which is made 2
very strong near the top of the flue d, where the heat is greatest.
Instead of making the lower part 2 of the disc or valve turn on a
joint or hinge, for increasing or diminishing the area of the passage at
the lower part of the fluc, the said lower part of the disc or valve
may be adjusted by making it slide upon the fixed upper part. This a
modification of my Invention is represented in Figure 4, where fis the
upper part of the plate, disc, or valve carried by the vertical arm g,
and is the bottom moveable part of the disc or valve capable of
sliding on the said upper part f. The sliding motion of the lower
part 2 is effected by the rod 1, which is adjusted and fixed as in the 3
first described arrangement.
Having now described the nature of my Invention, and the manner
in which the same is to be performed, I wish it to be understood that.

page_text: I do not limit myself to the precise details herein described and
illustrated, as the same may be varied without departing from the nature
of my Invention; but I claim as my Invention, the improvements in
apparatus for regulating or controlling combustion in the furnaces of
steam boilers having internal flues herein-before described and illus-
trated in the accompanying Drawing, that is to say, apparatus consist-
ing of a circular, oval, or other shaped disc, plate, or valve, suspended
at the rear end of the internal flue of the boiler, the lower part of the
said disc, plate, or valve being jointed to, or capable of sliding upon
the upper part, and its position adjusted as described; the said plate,
disc, or valve being carried by a hollow vertical arm so supported that,
when required, the plate, disc, or valve can be withdrawn from the end
of the flue, the said hollow arm also protecting the adjusting rod from
the action of the fire; the parts of the said apparatus being constructed,
arranged, and used substantially as described and illustrated.
In witness whereof, I, the said George Dingley, have hereunto set
my hand and seal, this Second day of November, in the year of
our Lord One thousand eight hundred and seventy-four.
Witness,
JAMES STUBBS FOSTER,
Leicester.
GEORGE DINGLEY. (L.S.)