Year: 1899

page_text: Date of Application, 11th Apr., 1899
Complete Specification Left, 6th Feb., 1900-Accepted, 10th Mar., 1900
We, WILLIAM HALLET BAKER and SAMUEL HALLET BAKER both of Bracknell,
Berkshire, Ironmongers, do hereby declare the nature of this invention to be as
follows:-
The bridge is made of two plates held apart and internally vertically divided for
a portion of their height where the inlet for air is. On the lower part of the
front plate is an opening to admit air which is heated by passing up between the
plates after which it passes out at the back of the bridge meeting the smoke and
assisting its combustion in the flue. The front air opening is arranged to be
wholly or partially closed by valve operated from front of boiler, when necessary
to reduce the quantity of air admitted.
On the front of the plate nearer the door of furnace, a right angle ledge is
made to carry the fire bricks of the bridge, and to support one end of the bars.
Dated this 11th day of Anril 1800
FREDERIC PRINCE,
Agent for Applicants.
We, WILLIAM HALLET BAKER and SAMUEL HALLET BAKER, both of Bracknell,
Berkshire, Ironmongers, do hereby declare the nature of this invention, and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to an improved construction and arrangement of parts,
composing a fire bridge for furnaces, the objects being mainly, to effect a proper
consumption of the smoke, and to increase the efficiency and economy of furnaces.
In order that our invention may be readily understood we will describe same
with reference to the accompanying drawings, whereon is shown an example of
a smoke consuming fire bridge constructed according to this invention.
Figure 1 shews a front sectional elevation of a furnace with our improved fire
bridge fitted therein.
Fig. 2 is a vertical section of same.
Fig. 3 is a plan view of the bridge.
Fig. 4 is an elevation shewing the interior of the bridge, the front plate thereof
having been removed.
Similar letters. of reference refer to like parts in the several figures of the
drawings.

page_text: According to our invention we construct the bridge in two main parts, consist-
ing of a front plate or part A, and a rear part B.
These two parts A and B are arranged vertically, and are held at a distance
apart by a flange formed upon one of such parts, as by the flange B upon the
part B, which fits against and is fixed to, the rear face of the part A, thereby
forming a chamber C, between the said parts.
In the lower part of the front plate A, we form an opening 1), to admit air
which passes through such opening from beneath the fire bars from the front of
the furnace into the chamber C, and at the upper part of the back plate B, we
form an exit opening E for the passage of air from the chamber C, the latter exit
opening E, may as shewn at Fig. 2, be formed with lips externally, and the passage
may be somewhat tapered to increase the velocity of the air at its exit.
Ribs F, F, may be formed on the interior of the plates A, and B, for strengthen-
ing purposes as at Figs. 2 and 4, and such ribs may be so formed as to serve the
purpose of increasing the superficial area of the heating surface within the said
chamber C.
Upon the front of the plate A, opposite to the door of the furnace is formed a
ledge A, to support the fire clay protection for the bridge proper, and also for
supporting the rear ends of the fire bars G.
The top plate H, of the chamber C, we generally make removable in order that
the interior of the chamber may be inspected and cleaned when necessary without
removal of the structure from the furnace.
When in use the air passes into the chamber C, by the opening D, and becomes
heated in its passage through such chamber, by contact with the heated structure,
and passes out by the exit. passage E, in a heated state where it meets the pro-
ducts of combustion upon which it has a regenerative action and thereby con-
sumes the smoke and greatly increases the efficiency and economy of the furnace.
Obviously, the inlet of air may be regulated by providing the opening D, with
a door or slide capable of being controlled from the front of the furnace and
such may be fitted and operated in any well known or convenient manner and
therefor it is unnecessary to further describe or to shew same in the accompanying
drawings.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we
claim is :-
1. In a fire bridge for furnaces, constructing same with an inner chamber
formed by a front and back plate, one of such plates having flanges to form the
sides of such chamber, forming an air inlet opening to the chamber in the lower
part of the front plate, and an exit opening for the heated air in the upper part
of the back plate, together with a ledge on the front part of of the front plate to
carry the fireclay protection for the structure and to support one end of the fire-
bars, substantially as described.
2. The construction and arrangement of smoke consuming firebridge for
furnaces, substantially as and for the purposes described and illustrated with
reference to the accompanying drawings.
Dated this 30th day of January 1900.
FREDERIC PRINCE,
37, Cursitor Street, Chancery Lane, Agent for Applicants.