IMPROVEMENTS IN AND RELATING TO STEAM-BOILER AND OTHER FURNACES to be as follows:
Year: 1885

page_text: I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTS IN AND RELATING TO STEAM-BOILER AND
OTHER FURNACES to be as follows:-
"
This invention relates to furnaces for boilers and the like designed for the
double purpose, of permitting the easy cleansing of the parts constituting the grate,
and the consumption of the smoke.
With the improved construction herein described the gases of combustion are
mingled with each other and with a current of pure air passing automatically to
the middle of their mass. The combustion is thus ensured in as complete a manner
as possible.
The grate is constructed in such a manner that the turning of a shaft is sufficient
to break the clinkers adhering to the furnace bars, thereby permitting the free
access of air through the grate for supporting combustion.
The means which I employ for this purpose possess the advantage of being
conveniently adapted to all kinds of industrial fire-places or furnaces such as the
furnaces of either internally or externally fired boilers or the like.
According to the said invention the grate is composed essentially of a number of
(say six,) parallel series of discs of cast-iron provided with teeth, the circumferences
circumscribed around the teeth of the discs of one row being nearly in contact with
the circumferences around the teeth of the discs of the adjacent row or rows.
These six series of discs, of which each element is separate from that which
precedes it or which follows it, by a small shoulder, are each placed upon a
polygonal shaft of iron or steel according to the dimensions of the grate and
according to the strains to which they are subjected. There is sufficient play
between the discs and the shaft which carries them, to permit the discs to be
readily placed in position or removed with facility.
The shoulders of the stellated discs, by maintaining the width between the
teeth of the different discs, afford sufficient space for the passage of the air for
supporting combustion and for the cinders or ashes to drop through.

page_text: The disc shafts are each supported at one of its extremities in a metallic
n:ounting forming a bearing and fixed in the wall of the fire-bridge, and at the
other extremity it passes through a bracket and is prolonged to the front so as to
receive a toothed wheel for connecting all the shafts together. The shafts of the
two outer wheels each carry a ratchet wheel the form of which can be octagonal,
hexagonal or rectangular, and which can be acted upon through the medium
of a lever having a pawl. Instead of the pawls, naves or blocks provided with
depressions or apertures can be arranged upon these shafts, which apertures
receive the extremity of a lever. By this arrangement the heating of the
operating handle through conductibility is prevented.
These arrangements enable the attendant to cause, from time to time, without
much trouble, the various grooved cylinders of which the grate is composed to turn
and thus to break the clinkers which tend to clog it and at the same time to break
the masses of caked coal.
. .
In order to be able to easily replace a disc or a series of discs, when the necessity
arises, I have arranged the front bracket with a movable lower cap.
For boilers of locomotives, portable engines, steam boats or the like, the grate
can be divided into two or more parts one of which is operated from the right-hand
side and the others from the left-hand side of the boiler in question.
The bearings of the disc shafts are sometimes cast with a frame adapted to be
rivetted or bolted upon a flange provided below the door of the furnace.
The mouth of the furnace is prolonged so as to form a horizontal frame which is
closed by a door turning upon a horizontal axis. This door is provided with a
handle which forms a counter-weight and has notches with which a stop or pawl
can engage, the latter allowing to be actuated by hand.
The employment of a pawl can be avoided, as by giving to the operating lever
a sufficient inclination to enable the counter-weight to act properly. In the first
arrangement the door is limited in its motion by encountering the lower wall of
the frame of the furnace mouth. In the second arrangement this door having
only a height equal to that of the mouth is limited in its course by the impingement
of its bent part against a rib.
As regards the smoke consumption, this is obtained in the following manner.
The gases, almost immediately after passing the fire-bridge, enter a trunk-shaped
flue or conduit of refractory brick work and strike against a divider likewise of
bricks, which causes them to pass to the right and left, thus effecting a division of
the products of combustion. This division is further increased by the admission
of a quantity of hot air which is conveyed to the proper part by a pipe passing
through the lower part of the flue and extending to the space behind the fire-bridge
and contained between the latter and the trunk-shaped conduit.
Mauch 100K
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: The disc shafts are supported at one extremity in a metallic support C forming a
-bearing and fixed in the wall of the fire-bridge, and at the other extremity they
pass through a bracket D Figure 1, and are prolonged towards the front so as to
enable each one to carry a toothed wheel E for connecting all the shafts together.
The shafts of the two outer wheels each carry a ratchet-wheel F, Figure 3, the form
of which may be octagonal, hexagonal or rectangular, and which can be acted upon
through the medium of a lever G having a pawl.
Instead of the pawls, discs or blocks F¹ provided with depressions or apertures
can be arranged upon these shafts, which apertures receive the extremity of a lever.
By this arrangement, which is shown in Figures 8 and 9, the heating of the
operating lever through conductivity is prevented.
These arrangements enable the stoker or attendant to turn the various grooved
cylinders of which the grate is composed from time to time without much trouble
and thus to break the clinkers which tend to clog it and at the same time to break
the masses of caked coal.
In order to be able to easily replace a disc or a series of discs when the necessity
arises, I have provided the bracket carrying the front ends of the shafts with
movable bearings on its lower side.
The arrangement represented in Figures 7 and 9 can also be used, in which the
bearings of the shafts B are cast in one piece with a frame J adapted to be rivetted
or bolted upon a flange J₁ provided below the door of the furnace.
For boilers of locomotives, portable engines, steam boats or the like, the grate
can, to facilitate the cleaning of the furnace, be divided into two or more parts one
of which is operated from the right-hand side and another from the left hand side
of the boiler as shown in Figures 5 and 6.
The mouth I of the furnace is prolonged so as to form a horizontal frame which
is closed by a door K turning upon a horizontal axis L. This door is provided with
a handle M which forms a counter-weight and has notches with which a stop or
pawl N can engage, as shown in Figure 1, the latter being actuated by hand.
The employment of a pawl can be avoided as illustrated in Figure 9, by giving
to the operating lever a sufficient rearward inclination to enable the counter-weight
to act properly to maintain the door closed.
In the first arrangement the movement of the door is limited by encountering the
lower wall of the frame of the furnace mouth. In the second arrangement this
door, having only a height equal to that of the mouth, is limited in its course by
the impingement of its upper bent part K¹ against a rib K".
The consumption of the smoke is obtained in the following manner, that is
to say :-
The gases, almost immediately after passing the fire-bridge (Figure 1), enter a
trunk-shaped flue or conduit O of refractory brick work and strike against a
divider or deflector P likewise of brick, which deflector causes the gases to pass to
the right and left, thus effecting a division of the products of combustion. This
division is further increased by the admission of a quantity of hot air which is
conveyed by a pipe Q passing through the lower part of the flue to the space Q
behind the fire bridge and contained between the latter and the trunk-shaped
conduit.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed as communicated to
me by my foreign Correspondent I declare that what I claim is
First. A furnace having a grate of rotary bars arranged substantially as above
described and represented in the accompanying drawing, and operating as set forth.
Second. The improved grate consisting essentially of the polygonal and parallel
shafts B upon which are placed series of stellated or toothed discs A, these discs
being provided with shoulders, or having teeth the thickness of which diminishes
from the bases to the extremities, and the said shafts being each supported at one
extremity in a bracket C provided with bearings, and at the other extremity either

page_text: in brackets D having bearings provided with movable lower portions or in a
frame J having bearings cast therein this frame being rivetted or bolted upon a
rib J¹ of the furnace front as described.
Third. One or more sets of toothed wheels E each of which sets is actuated by a
lever G, having a pawl F engaging with a ratchet-wheel, or by a disc or block F
having depressions or apertures for receiving a bar, the said toothed wheels and
ratchet-wheels or discs being arranged upon the front or at each side of the
furnace, and serving to cause the bars to rotate as described for the purposes
specified.
i
Fourth. The arrangement behind the fire-bridge of a furnace, of a trunk-shaped
conduit or flue O of refractory brick work and of a deflector P serving to divide the
gases of combustion and to mingle them with the air conveyed through a pipe Q.
Dated thin 92nd day of Decembar 100-
HASELTINE, LAKE & Co.,
For the Applicant,