IMPROVEMENTS IN FIRE BARS AND FURNACE FITTINGS CONNECTED THEREWITH FOR NATURAL OR FORCED DRAUGHT to be as follows
Year: 1885

page_text: therewith for Natural or Forced Draught.
We, DAVID JOHN MORGAN, of 184 Cowbridge Road, Canton, Cardiff, in the
County of Glamorgan, and JOHN H. PLEWS, of Rock Cottage, Landoff Road, Canton,
Cardiff, in the County of Glamorgan, Engineers, do hereby declare the nature of our
invention for "IMPROVEMENTS IN FIRE BARS AND FURNACE FITTINGS CONNECTED
THEREWITH FOR NATURAL OR FORCED DRAUGHT to be as follows:-
"
Our invention relates to fire bars and furnace fittings which may be used for any
form of grate, but are particularly applicable to the furnaces of steam generators,
and is designed to furnish a tubular fire bar, which shall be durable, strong and
cheap, and at the same time, in combination with a suitable dead plate and bridge
bearer to provide a special access for the draught, which may be either natural, or
artificially forced through the interior of the said tubular bars, and from the said
dead-plate or bridge bearer if required.
Our improved fire bars consist of hydraulic steam, or gas tubes, or any other
convenient description of piping, which may be conveniently perforated (when
required) and which, when used on an ordinary dead plate and bearers, to replace
fire bars of the ordinary construction, will serve to induce a draught through the
interior of the tubes. This will largely tend to keep them cool, and thus render
them more durable, and at the same time will increase the supply of air to the
fuel.
When fitting up a furnace complete with our improved fire bars, we provide a
hollow, front dead-plate, and also a hollow bearing box in the bridge, and a
continuous casing under the fire bars when required. The inside faces of this dead-
plate and bearing box are pierced with holes of suitable size, for the admission of
the ends of our tubular fire bars.
The hollow front dead-plate is provided also with other suitable openings to the
external air, which may be closed at will by slides or doors. When the said slides
are left open a natural draught will be induced through the body of our tubular fire
bars, entering the burning fuel through the aforesaid perforations in the top, sido,
or bottom surfaces of the fire bars, as may be desired. The bridge bearing box
may also be provided with other openings, closed if desired by slides or doors,

page_text: operated from the front of the furnace, by which the hot air passing through the
fire bara may be admitted either to the back of the fire, or to the combustion
chamber on the other side of the bridge, as may be desired, to effect the better
combustion of the hot gases and of the smoke. We also fit the front hollow dead-
plate with a tube or pipe entry through which, when the other slides or doors to
the said hollow front dead plate are closed, an artificial draught, from any
convenient fan or other source, may be forced into the fire through our tubular fire
bars, and the perforations in the same, and also through our hollow bridge bearing
box, behind the fire, and into the combustion chamber, as may be desired.
Dated this 19th dow of Inne 1005

page_text: therewith for Natural or Forced Draught.
We, DAVID JOHN MORGAN, of 181 Cowbridge Road, Canton, Cardiff, in the
County of Glamorgan, and JOHN HENRY PLEWS, of Rock Cottage, Landoff Road,
Canton, Cardiff, in the County of Glamorgan, Engineers, 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 :-
Our invention relates to fire bars and furnace fittings which may be used for any
form of grate, but are particularly applicable to the furnaces of steam generators,
and is designed to furnish a tubular fire bar, which shall be durable, strong, and
cheap, and at the same time, in combination with a suitable dead plate and bridge
bearer, to provide a special access for the draught, which may be either naturally
or artificially forced through the interior of the said tubular bars, and from the said
dead plate or bridge bearer if required.
In order that our invention may be the better understood we now proceed to
describe the same in relation to the drawings hereunto annexed, reference being
had to the letters and figures marked thereon. Like letters refer to like parts
throughout the drawings.
Figure 1 is an end view of a furnace fitted with our improved fire bars and
apparatus.
Figure 2 is a longitudinal section through the same.
Figure 3 is a halved detail of the front dead plate.
Figure 4 is a transverse section through the front dead plate.
Figure 5 is a part sectional elevation of the back bearer plate, showing the
draught regulator.
Figure 6 is a transverse section through the same.
A A (figure 2) are our improved fire bars, consisting of hydraulic, steam, or gas
tubes, or any other convenient description of piping, which may be perforated when
required, and which, when used on the ordinary dead plate and bearer to replace
fire bars of the ordinary construction, will serve to induce a draught through the
interior of the tubes. This will largely tend to keep them cool and thus render
them more durable, and at the same time will increase the supply of air to
the fuel.
When fitting up a furnace complete with our improved fire bars, we provide a
hollow front dead plate B, (shown in detail in figures 3 and 4), and also a hollow
bearing box C (shown in detail in figures 5 and 6) placed in the bridge, and the
ash-pan D is closed by a door E, so that the forced or natural draught may enter
or traverse the fire bars before entering the fire. The inside faces of this dead
plate B and bearing box C are pierced with holes F F (figures 3 and 5) of suitable
size for the admission of the ends of our tubular fire bars, which in such case are
preferably not perforated.
The hollow front dead plate B is provided with suitable openings, or the grating G,
(figures 1 and 3) for the admission of the external air, and which may be closed at

page_text: will by a slide or door. When the said door or slides are left open, a natural
draught will be induced through the body of our tubular fire bars, which may enter
the burning fuel through perforations in the top, side or bottom surface of the fire
bars if such are used.
Or, the tubular fire bars may not be perforated, and may conduct the air to the
closed chamber C, thence through the aperture N, controlled by a valve and hand
rod under the partition ash-plate P, thence through the orifice Q into the
fire, through the spaces between the bars. This arrangement ensures thorough
heating of the draught before it enters the fire, and the sloping ash-plate P throws
the ashes forward to the front, where they may be readily removed through the
door E.
The bridge bearing box C may also be provided with other openings H (figures 2
and 5) closed when required by a door or slides K, operated from the front of the
furnace by a rocking bar L, or in any other convenient manner, by which the air,
after passing through the fire bars A, may be admitted to the back of the fire, or
to the combustion chamber on the other side of the bridge to effect the better
combustion of the gases and of the smoke.
We also fit the front hollow dead plate B with a tube or pipe entry M, through
which, when the other slides or doors in the said hollow front dead plate are closed,
an artificial draught, from any convenient fan, or other source, may be forced into
the fire through our tubular fire bars, through our bridge bearing box C, behind the
fire, thence under the partition ash-plate P, and so into the fire as before described.
If desired, a part of such forced draught may also be allowed to enter the fire
through perforations in the bars, or into the combustion chamber behind the bridge
through the valve H.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is :-
1st The construction of a furnace grate with tubular fire bars, consisting of
hydraulic, steam, or gas tubes, perforated or not with small holes in any part of
the surface of the tubes, for the transit and heating of the draught through the
said bars, before entry into the furnace or combustion chamber, substantially as
described.
2nd The combination of a hollow dead plate, provided with air door and slides,
and an inlet piping, and of a hollow box bridge bearer provided also with air
apertures and slide, with tubular fire bars of hydraulic, steam, or other piping,
conveniently carried by round bearing holes in the said dead plate and bearer,
for use with either a natural or artificially forced draught, substantially as
described.
3rd The combination of tubular fire bars of any form, and hollow dead plate and
hollow bridge or bridge bearer, with a return orifice under the fire and a sloping
partition ash-plate, provided with an orifice or orifices, to permit the draught, either
natural or forced, after traversing the said tubular bars, to return under the ash-
plate, and thence issue, after thorough heating, into the fire, substantially as
described.
FELL & WILDING,
Agents for the Applicants.