Improvements in Steam Boilers and Furnaces therefor.
Year: 1891

page_text: Date of Application, 7th July, 1891
Complete Specification Left, 6th Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by WILLIAM SPRAGUE POST, Machinist, of 154,
West Canton Street, Boston, Massachusetts, United States of America, and
HOWARD DE WOLFE SAWYER, Engineer, Maverick House, Maverick
Square, East Boston, Massachusetts, United States of America.]
Improvements in Steam Boilers and Furnaces therefor.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents
45 Southampton Buildings, in the County of Middlesex do hereby declare the
nature of this invention to be as follows :—
This invention is in the nature of an improvement upon the apparatus shown in
the Letters Patent granted to me No. 16388, dated November 12th 1888 and sealed
August 12th 1889, for steam boiler and furnace, said apparatus embodied, in a
down-draft boiler, a suitable water-back, an independent water-box free from
attachment to the walls of the boiler, and a series of tubular grate-bars and water-
supply pipes therefor, directly connecting such water-back and box, and providing
a circulation from and to the water-back through said pipes, box and grato bars.
By my present improvement the water-supply is drawn from the bottom of the
boiler, beneath the fire-box, the supply pipes extending theuce obliquely upward
and forward to the water-box, from which the grate tubes run rearwardly to the
water leg or back. By this construction the water-leg or back is relieved from
much of the weight and strain borne by it in said prior apparatus, the circulation is
much improved by drawing water from the bottom of the boiler, and the chlorio
current is caused to impinge twice against and to run nearly parallel with the
supply pipes in its course from the fuel chamber, downwardly, between the grate
tubes and the supply pipes and rearwardly passing the lower ends of the supply
pipes, said current then rises into a chamber in rear of the water-leg and passes to
front or rear through ordinary boiler flues to the uptake, or it may rise through
vertical flues as in the construction shown in said Patent. I prefer to have two
independent fire-boxes of cylindrical form placed side by side within the boiler
shell, each having a vertical chamber in rear of the water-leg, with flues leading
from it, said chambers being separated by a water-space.
Dated this 7th day of July 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers and Furnaces therefor.
I HENRY HARRIS LAKE of the firm of Haseltine Lake & Co. Patent Agents
45 Southampton Buildings in the County of Middlesex 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 steam boilers and furnaces and comprises improvements
upon the apparatus shown in British Patent No. 16388 November 12th 1888.
The said apparatus embodied in a downdraft boiler a suitable water-back-or
water leg an independent water box free from attachment to the walls of the boiler,
and a series of tubular grate bars and water supply pipes therefor directly connecting
such water back and box and providing a circulation from and to the water-back
through said pipes, box, and grate bars,

page_text: By the present improvement the water supply is drawn from the bottom of the
boiler beneath the fire box, the supply pipes extending thence obliquely upward and
forward to the water-box, from which the grate tubes run rearwardly to the water-
leg or back. By this construction the water leg or back is relieved from much of
the weight and strain borne by it in said prior apparatus, the circulation is much
improved by drawing water from the bottom of the boiler, and the caloric current
is caused to impinge twice against and to run nearly parallel with the supply-pipes
in its course from the fuel chamber downwardly between the grate-tubes and the
supply-pipes and rearwardly passing the lower ends of the supply pipes. Said
current then rises into a chamber in rear of the water leg and passes to front or
rear through. ordinary boiler flues to the uptake, or it may rise through vertical
flues, as in the construction shown in said Patent.
The several features of this invention are hereinafter described.
In the accompanying drawings this invention is shown as embodied in a boiler
having within a single cylindrical shell two distinct fire-boxes, cach supplemented
by its set of horizontal flues running above it from the vertical extension of such
fire-box to the uptake, so as to provide for two independent fires, either of which
may be used without the other, or both in concert.
Figure 18 a longitudinal section on the liue ex of Figure 2, and
Figures 2 and 3 are respectively front and rear end elevations, one half of each
figure being in vertical section on the lines zof Figure 1..
Figure 4 is a modification.
A is the external shell and, B B the fire boxes placed side by side and somewhat
apart from each other in the lower part of the shell A. The fire 'boxes are
preferably corrugated steel cylinders to insure the maximum of strength. The front
end of each is shown protruding through a collar C in the end wall of the boiler,
while the other end is at its lower half secured to the inner plate of the rear water
containing wall.D.
E represents a rigid depending water leg or wall closing the upper half of the
fire pot at a suitable point, leaving behind it an upright chamber F.as a vertical
extension of the combustion chamber.
Gis tho water grate formed of a series of parallel tubes entering at their inner
ends the water leg E and at their outer ends the transverse water box H, which box
is independent of the walls of the fire box, so that it can yield with the expansion
and contraction of the grate tubes.
JJ, are water supply pipes running from the water box H through the bottom
of the fire box and bringing water thus from the lower portion of the boiler through
the water box and tubular grate into the water leg E. The pipes.J. Jiextend
obliquely from the water box H, preferably to a point nearly under the water leg E,
where they are furnished with an elbow or formed on a curve J', such elbow or curved
part of the pipe running, about radially toward and through the lower part of the
shell of the fire box. By making these pipes radiate to right and left, as in
Figure 2, a wide space is given for raking out ashes from beneath the grate and
access for workmen to enter the chamber is afforded. 'I prefer to form bosses or
pockets on the lower part of the water box to receive the ends of the supply
pipes J. Man, holes, K are provided between and on either side of the..firo boxes,
and strong stay rods L, stay bolts M, and curved supports. N. are furnished.
P,P,,represent boiler flue tubes, in this instance :ranuing horizontally above.the
fire boxes from the upright chamber F.forward.to the uptake.Q, (indicated by
dotted lines at the left of Figure 1). The caloric current,.,after acting upon the
water walls on all sides of said chamber, passes through the flues and escapes
upwardly. A perforated pipe 'R may receive steam from the upper part of the
boiler and can be coupled to an external pipe to convey it to any desired point.
The flue tubes of the boiler are arranged in two distinct series, each appertaining
to one of the fire, boxes and each secured at the inner end to the metallic shell-or
wall of the vertical extension F rising from the fire box, a'broad water space being
reserved between said shells or chambers themselves and between each and the side

page_text: walls A of the boiler. Thus each fire box may be operated without the other, if
desired.
In the modification, Figure 4, the supply pipes J run from the water box H
obliquely to the lower part of the boiler and penetrate the rear wall of the
chamber F at the bottom of the fire box, instead of going through the bottom itself.
With this construction which forms a part of this invention similar results are
obtained, the circulation is approximately the same, the bracing offect of the truss
is secured with freedom of expansion to grate tubes and supply pipes, and the heat
applies to such tubes and pipes in substantially the same way.
Having now particularly described and ascertained the nature of the said' inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents I declare that what I claim is :-
First. The fire box formed with a depending water leg or wall and the water
grate connecting at its inner end directly with the lower part of such leg or wall in
combination with the water box connected to the opposite end of the grate tubes,
and with the feed pipes leading obliquely upward from the lower part of the boiler
to said water box, whereby water is supplied from the bottom of the boiler direct
to the grate, substantially as set forth.
Second. The fire box formed with a depending wator leg or wall and the
independent water box free from attachment to the fire-box shell in combination
with the water grate connecting said water-leg and box, and with the oblique and
radially arranged supply pipes connecting said water-box with the bottom of the
boiler, substantially as set forth.
Third. The boiler shell A, fire box B, inclosed therein, and depending water
leg E, with the vertical chamber F beliind it, in combination with the water
grate G, box H, and supply pipes J within the fire-box, and the flues P, leading
from said chamber, substantially as set forth.
Fourth. The boiler shell A, fire-boxes B B, with their respective vertical
extensions F F separated by a water passage and placed side by side within said
shell, and the distinct series of flues P P appertaining thereto, in combination with
a water grate suitably supplied with water, and a depending water leg or back
enforcing a downward draft through said grate, substantially as set forth.
Dated this 6th day of April 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.