Improvements in or connected with Apparatus for Supplying Air to Furnaces.
Year: 1893

page_text: Date of Application, 10th Feb., 1893
Complete Specification Left, 10th Nov., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Apparatus for Supplying Air to
Furnaces.
We, GEORGE KNOWLES, Cotton Spinner, and WILLIAM HENRY CAVE,
Engineer, both of Peel Mills, Turton Street, Bolton, in the County of Lancaster, and
JAMES JONES MELDRUM and THOMAS FREDERICK MELDRUM, Engineers, both of
Atlantic Works, City Road, Manchester, in the County of Lancaster, do hereby
declare the nature of this invention to be as follows:-
This invention has reference to furnaces in connection with which steam jet
apparatus is used for supplying air thereto, that is, into the ash-pits or spaces
below the fire bars or fuel bearers thereof, and by which the pressure of air used
for supporting combustion of the fuel in said ashpits or spaces is maintained above
that of the atmosphere.
The invention is applicable to all or most kinds of furnaces, such as those of
steam generators of various kinds, furnaces used in the manufactures for various
purposes, and analogous, or other furnaces.
The steam jet apparatus used under this invention consists of what are commonly
called "steam jet blowers," and are mounted in a door or plate (or doors or plates)
for the purpose of
which cover or come in front of the ashpit or similar space,
rendering such ashpit or space air tight, or sufficiently air tight for the purpose.
This door or plate (when one only is used) carrying one, two, or more steam jet
blowers, is mounted upon a suitable hinge or movable joint, mounted or supported
on or by a hinged or movable bracket or support arranged or mounted upon one
side of the ashpit or similar space, the door or plate thus having movement
thereon.
By the above arrangement or construction, the doors, fronts or plates with the
blowers, may be swung to one side for cleaning the ashpit, or other purpose, and
then swung back into position, the joints or mountings enabling said plate or door
to come fairly and properly onto the seat or surface in connection with which it is
adapted to work.
The movable door or plate covering or enclosing the ashpit or similar space, or
part thereof, may be fitted to the original front of the furnace or flue ends; or,
special seats (which may be faced) may be provided in connection with same; and
there would be provided on or in connection with the door or plate and furnace,
suitable latches or catches, or holding devices, by which it would be held in place
or fixed.
In some cases, the nozzles by which the steam is supplied to the blowers are
5 mounted on or supported by the steam supply pipe, which is mounted and working
on a separate hinge or support; and this may be held in position by a suitable catch
or equivalent holding device. In some cases it may be more convenient to arrange
or fix the steam pipe hinge or support on the side opposite the moving or movable
door or front plate support.
0
This invention, it is to be understood, is not restricted to the (or any) special con-
structions or dispositions of the parts. more particularly mentioned or described
above, since these can be varied, modified, or equivalents used, without departing
from the legitimate scope thereof.
Dated this Oth dow of Fahru 1802
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Apparatus for Supplying Air to
Furnaces.
We, GEORGE KNOWLES, Cotton Spinner, and WILLIAM HENRY CAVE,
Engineer, both of Pecl Mills, Turton Street, Bolton, in the County of Lancaster, and
JAMES JONES MELDRUM and THOMAS FREDERICK MELDRUM, Engineers, both of
Atlantic Works, City Road, Manchester, in the County of Lancaster, 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 has reference to furnaces in connection with which steam jet
apparatus is or are used for supplying air thereto, that is, into the ash-pits or spaces
below the fire-bars or fuel-bearers thereof; and by which the pressure of air used for
supporting combustion of the fuel in said ashpits or spaces is maintained above that
of the atmosphere.
<<
The invention is applicable to all or most kinds of furnaces, such as those.
of steam generators of various kinds, furnaces used in the manufactures for
various purposes, and analogous, or other furnaces. The steam jet apparatus
used under this invention consists of what are commonly called steam jet
blowers," and are mounted in a door or plate (or doors or plates) which
cover or come in front of the ashpit or similar space for the purpose of rendering
such ashpit or space air tight, or sufficiently air tight for the purpose.
This door or plate (when one only is used) carrying one, two, or more steam jet
blowers, is mounted upon a suitable hinge or movable joint or joints, mounted or
supported on or by a hinged or movable bracket or support or supports arranged
or mounted upon one side of the ashpit or similar space, the door or plate thus
having movement thereon.
By the above arrangement or construction, the doors, fronts or plates with the
blowers, may be swung to one side for cleaning the ashpit, or other purpose, and
then swung back into position, the joints or mountings enabling said plate or door
to come fairly and properly onto the seat or surface in connection with which it is
adapted to work.
The movable door or plate covering or enclosing the ashpit or similar space, or
part thereof, may be fitted to the original front of the furnace or flue ends; or,
special seats (which may be faced) may be provided in connection with same;
and there would be provided on or in connection with the door or plate and
furnace, suitable latches or catches, or holding devices by which it would be held in
place or fixed.
In some cases, the nozzles by which the steam is supplied to the blowers are
mounted on or supported by the steam supply pipe, which is mounted and works on
a separate hinge or support; and this may be held in position by a suitable catch
or equivalent holding device. In some cases it may be more convenient to arrange
or fix the steam pipe hinge or support on the side opposite the moving or movable
door or front plate support.
This invention, it is to be understood, is not restricted to the (or any) special
constructions or dispositions of the parts more particularly specified herein, since
these can be varied, modified, or equivalents used without departing from the
legitimate scope thereof.
A drawing illustrating the above described improvements accompanies this
Specification, and forms a part thereof.
In these drawings
Figure 1 is a front elevation of a furnace-say of a cylindrical furnace of a
steam generator-provided with the said improvements; whilst Figure 2 is a plan

page_text: "
Referring now to the. drawings, a is the door or plate to which the steam jet
blowers are attached, and by which, practically, the whole of the front of the
ashpit of the furnace is closed when said door is shut. designates two steam jet
blowers preferably of the "Meldrum type-held in position in the said door
by their heads, and preferably in the manner usually adopted with the blowers used
in "Meldrum" furnaces. c is a plate or frame secured to the face d of the steam
generator (or other furnace front as the case may be), and having upon it a seat c',
projecting from the face of the frame c, against which the face at the edge of the
door a comes and bears, and with which it makes an air-tight or sufficiently air-tight
joint. e are two arms hinged to the frame e by pins e¹, and carrying at their other
end the door a, the support of such door being effected by hinges consisting of two
lugs a¹ and pins 2, said pins passing through the lugs a¹ and the bosses e³ on the
end of the arms. The lower of these arms e takes the weight of the door a by the
lug a resting upon the end or boss e³ of the lower arm e. fare latches hinged on
either side of, and to, the door a, and adapted to engage with catches f¹
on the
frame c, in the ordinary manner of a fire-door latch; by which the door a is kept
closed and upon the face c¹. is a pipe by which steam is conveyed to the blowers
from the steam pipe j, said pipe being connected at its outer end by a hinged joint i
to the plate a, and to the pipej by a hinge in the form of a tap, the outer part of
which is connected to the pipe h, and the inner part g¹ to the end of the pipe),
constituting a plug in the outer casing g in the manner of an ordinary plug cock,
except that in this case the outer part or case g is moved and the plug held
stationary. The steam aperture of said plug is faced towards the ashpit (as shewn
in the drawings) so that it coincides with the aperture in the outer case g and the
bore of the pipe when the door a is closed and in the position shewn in the
drawings; but when the door is open this communication between the pipe j and
the pipe will be broken, and steam will be cut off to the blowers. j' is an
ordinary stop cock or tap which can be used when desired. k is the ordinary
upper part of the furnace front with door / therein. h are nozzles on the
pipe, disposed opposite the centres of the inlets of the blowers b and discharging
the steam, by which the introduction of air is effected, into said blowers.
In operation, when the door a is closed, steam will flow from the pipe j into the
pipe by way of the hinge valve g, through the nozzles ', into the blowers b;
and air will be forced into the ashpit through the bodies b (which lie practically
wholly within same) under pressure.. To gain access to the ashpit for clearing out
same, or clinkering, or the like, or other purpose, the latches fare lifted out of the
catches f¹, and the door a, with the blowers b, is swung back upon the arm
supports e. The steam pipe being connected with the plate a, and hinged
relatively with the hinges e¹, as shewn, causes the movement of the door a to be
such as to control its motion, and bring the blowers steadily and in the required
manner out of the ashpit; and conversely, to bring them back in the right manner,
into it, when closing the door a.
:
By this construction and arrangement the whole of the interior of the ashpit of
a furnace can be made open to the stoker for cleaning out the ashes, clinkering, or
otherwise when desired.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what 'we
claim is :-
:-
1. The herein described improvement connected with apparatus for supplying
air to furnaces, consisting of a door or plate, such as a, having attached to it
steam jet blowers the bodies whereof normally lie wholly or mainly in the ashpit
or space horizontally under the fire bars or bearers, and so supported and guided
as to control its motion when being opened and closed for the purposes specified.
2. In connection with a furnace air supply apparatus, a door a covering
mainly the front of the ashpit and carried by hinged arms, such as described;
steam jet blowers secured in said door, the bodies whereof lie practically wholly

page_text: within the ashpit; and a steam pipe, by which steam is conveyed to the nozzles
of said blowers, hinged and moving with said door when opened and closed;
substantially as herein set forth.
3. In apparatus for supplying air to furnaces, a door frame, such as c, secured
to the furnace front at the ashpit entrance; a door a working in connection
with same, and making an air tight joint therewith, and mounted on hinged
supports and steam jet blowers, such as b, fixed in and carried by said door by
their heads, their bodies lying normally practically wholly within the ashpit;
substantially as set forth.
4. Apparatus for supplying air to furnaces having parts arranged, constructed,
and adapted to operate, particularly as set forth with reference to and shewn in
the drawings.
Dated L
r
T
མ“ 9L
LOOD.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicants' Patent Agents.