Improvements in or relating to Furnaces.
Year: 1895

page_text: Date of Application, 2nd May, 1895
Complete Specification Left, 1st Feb., 1896-Accepted, 7th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnaces.
We, CADDY & COMPANY LIMITED, Engineers and Iron Founders, and
LEOLINE EDWARDS, of Cherry Hill Villa, Manager of the said company, both
of Daybrook, in the County of Nottingham, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in steam boiler and other furnaces in
which forced draught is employed for accelerating the combustion of the fuel, or
other closed ashpit furnaces, and it has for its object to provide means for
increasing the combustion and thus giving a more perfect smoke consumption.
In carrying out this invention, we employ tubular fire-bars such as described in
the Specification of Letters Patent Nos. 10289 of 18th July 1884, and 16404 of
October 15th 1890 but modified in form to suit the arrangement hereinafter
described. The tube in each firebar is carried straight through and a portion is
left projecting at the extreme front and back. At the front the projecting tube
ends rest on, or fit into a lip plate, or hollow dead plate provided with, or in
communication with, an opening in front of the furnace so that atmospheric air
has free access to the interior of tubes. The rear ends of the tubes fit into a
hollow fire-bridge or into an opening or openings communicating with the back of
the firebridge.
The space below the bars or ashpit is closed in at the back by the lower part
of the fire-bridge and at the front by a cover fitted with one or more pipes
through which air may be forced or injected by a steam jet or other suitable
arrangement.
The action of the furnace is as follows:-The air forced into the closed ashpit
passes between the fire-bars and comes into contact with the fuel, and the products
of combustion therefrom are carried by the forced draught over the fire-bridge.
At this point the products of combustion come into contact with the air which is
drawn through the tubular firebars by the ordinary draught. During its passage
through the firebars this air is heated and mixing with the gases assists in the
consumption of the smoke.
Dated this 1st day of May 1895.
BOULT & WADE,
Agents for the Applicants.
Improvements in or relating to Furnaces.
We, CADDY & Co. LIMITED, Engineers, and Iron Founders, and LEOLINE
EDWARDS, of Cherry Hill Villa, Manager of the said company, both of Daybrook,
in the County of Nottingham, 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 improvements in steam boilers and other furnaces in
which forced draught is employed for accelerating the combustion of the fuel, or

page_text: to other closed ashpit furnaces, and it has for its object to provide means for
obtaining in such furnaces more perfect smoke-combustion.
The invention will be best understood by reference to the accompanying drawings
in which
Fig. 1 is a longitudinal section showing our improved furnace applied to a steam
boiler, part only of the latter being shown.
Fig. 2, is a cross section on line X, X of Fig. 1.
Like letters indicate like parts throughout the drawings.
In carrying out this invention we preferably employ tubular firebars A which
are of similar construction to those described in the Specifications of Letters
Patent No. 10289 of 18th July 1884, and No. 16404 of October 15th 1890, but
modified as shown to suit the present arrangement. The tube B in each fire-bar
is carried straight through the bar and a portion may be left projecting at
each end.
At the front of the furnace the ends of the bars A are carried by a hollow dead
plate formed preferably by the two plates C C₁ placed above each other with an
intervening air space between. The two plates C C¹ may be bolted together by
bolts D, (Fig. 2) bosses or distance pieces D' being placed on each bolt between
the plates.
The inner edge of the lower plate C¹ extends beyond that of the upper plate in
order to form a bearing for the ends of the fire-bars A, the latter may each be
formed with a stud or projection A' to engage with a raised rib C2 on the edge of
the plate C¹ in order to prevent the fire-bars from being displaced.
The rear ends of the bars A are carried between the upper edge of the transverse
plate F, and the lower face of the fire-bridge G, in the same manner as described
in the Specifications of Letters Patent herein before referred to or they may be
carried into a hollow fire-bridge.
The ashpit or space L below the fire-bars is closed-in at the back by the
transverse plate F as shown or by the lower part of a hollow fire-bridge, and at the
front by a cover H fitted with one or more tubes I through which air may be
injected or forced by a steam jet J or other suitable means.
A sliding tray or drawer K may be placed between the plates C C¹ of the hollow
dead plate in order to form a receptacle for dust or ashes, the front of the said tray
or drawer being provided with a ventilator or perforated plate K', to regulate the
air supply to the bars.
The action of the furnace is as follows:-
The air or steam and air forced into the closed ashpit L called in the claims
"an undergrate forced draught," passes between the fire-bars A and through the fuel,
and the products of combustion therefrom are corrid by the forced draught over
the fire-bridge. At this point the products of combustion come into contact
with the air which is drawn through the tubuler fire-bar. A by the ordinary
draught.
This cir, during its passage through the firebars is heated, and, mixing with the
escaping gases, asist in cousuming the smoke.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In a furnace the combination with an undergrate forced draught of a natural
draught through tubular or hollow fire-bars substantially as herein described.
2. In a furnace the combination with a closed ashpit such as L for an under-
grate forced draught of tubular or hollow fire-bars such as A through which air
is drawn by the natural draught substantially as described and illustrated in the
accompanying drawings.
3. In a furnace the combination with a closed ashpit such as Land tubular or
hollow fire-hars such as M of a hollow dead plete sich an CC for conveying air

page_text: to the fire-bars substantially as described and illustrated in the accompanying
drawings.
4. The combination and arrangement of parts constituting the complete furnace
substantially as described and illustrated in the accompanying drawings.
Dated this 31st day of January 1896.
P. P. CADDY & CO., LTD.,
HENRY HILL, Managing Director.
Boult & Wade,
Agents for the Applicants.
P. P. CADDY & CO., LTD.,
HENRY HILL, Managing Director.
Boult & Wade,
Agents for the Applicants.