Improvement in Fire Bars in conjunction with a Natural Induced Draught.
Year: 1897

page_text: Improvement in Fire Bars in conjunction with a Natural Induced
Draught.
ALBERT JOSEPH STOKES, 21, Burnbank Gardens, Glasgow, Commercial Traveller;
and EDWARD GEORGE PEYTON, 4, Castle Gardens, Gourock, County of Renfrewshire,
Journalist, do hereby declare the nature of this invention to be as follows:-
The improvement consists in placing thin plate bars, which may be fluted or
ribbed, crossways along the boiler Hue, and so arranged that the air is conducted
between the plates immediately to the coals, without causing any dead points.
The fire bars are held in position by iron stays or tubes that traverse the whole
Jength of the firegrate and are braced or held in position by a trausverse piece
of iron, that passes across the opening or mouth of the flue immediately below the
door plate. The object of this stay is to hold the fire bars in a sloping position
outwards. The bars are constructed of thin cast iron plates which may be flat,
fluted or ribbed, and they may fit into, or dove tail into, each other. Along the
sides of the flue contingent to the boiler, supporting pieces aro placed to hold the
fire bars. These pieces may be solid or hollow at the sides. In some cases
additional strength may be added by introducing iron rods to support the fire bars
in the centre. At the back of the Hue, in lieu of the brick bridge an irou bridge
coated with fire brick is constructed, having a narrow opening at the back so as to
produce an induced draught of air. In front of the iron plate forming the face of
the bridge, a baffle plate is fixed for the treble purpose, of preventing the ashes
reaching the back of the fire pit, to arrest the air until it is sufficiently heated and
to act as a bed for the sloping bars. For smaller or ordinary grates the application
is somewhat different in construction, for the fire bars though being placed in the
same manner may be different depths suitable for conducting the air into the
coals. The fire bars are sloped at the top, that is the top surface is slanted and
not at right angles to the depth of the fire bar. When tubos are used to support
the fire bars bars, they may be conducted into the hot air chamber at the bridge.
The opening of the pipes can be closed with dampers, which can be worked
automatically or by hand.
100%

page_text: COMPLETE SPECIFICATION.
Improvement in Fire Bars in conjunction with a Natural Induced
Draught.
We, ALBERT JOSEPH STOKES, of 21, Burnbank Gardens, Glasgow, Commercial
Traveller, and EDWARD GEORGE PEYTON, of 4, Castle Gardens, Gourock, Journalist,
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 improvements consist in placing these plate bars which may be flat, fluted,
ribbed, corrugated, or indented, crossways along the boiler flue and so arranged
that the air is conducted between plates immediately to the coals without causing
any dead points.
In order that our invention may be properly understood and readily carried into
effect we have hereunto appended one sheet of drawings of which,
Figure 1 is a front elevation of a single flue Cornish or Lancashire boiler to which
our improvements are applied, but of course our improvements are also applicable
to marine or any kind of boiler where bars are used.
Figure 2 is a longitudinal section of the same.
Figure 2 is part plan of the bars.
Figure 2 is a perspective view of a device placed behind the bridge, for
regulating the amount of air necessary for the proper combustion of the furnace
fire.
Figure 3 is a front view of a fire bar made in accordance with and constituting
our invention.
Figure 4. is an end view of the same.
Figure 5 is a similar view to Figure 3 of a modified form of fire bar.
Figure 5 shews the bars with a corrugated surface.
Figure 6 is an end view of a curved fire bar.
Figure 7 illustrates one of the side bars for retaining the fire bars in
position.
Figure 8 is a transverse section of a domestic fire grate embodying a further
feature of our invention.
Figure 9 is view of frame for carrying the moveable bars.
The fire bars A are held in position by the iron stays or tubes B placed centrally
along the fire grate and traverse the whole of its length. This longitudinal bar
or stay B is braced or held in position by a transverse piece C which passes across
the opening or mouth of the flue and immediately below the doorplate as seen
in Figure 1. The object of the stay is to hold the fire bars A in a sloping
position outwards or in a position inclined to the vertical as seen 'in
Figure 2.
The bars A are constructed of thin cast iron plates which may be flat, fluted,
ribbed, corrugated or indented as shewn in the drawings, and they may fit into or
dovetail into each other.
Along the sides of the flue contingent to the boiler supporting hollow or solid
pieces D corresponding to Figure 7 are placed to hold the fire bars A at either
side. At the back of the flue, in lieu of the brick bridge an iron bridge E
coated with fire brick is constructed having a narrow opening El at the back
between it and a partition wall so as to produce an induced draught of air which
passes through a chamber I placed in said opening whose outlet is regulated
by a top plate E2 which is loose to allow for expansion and contraction. The
loose plate E2 rests upon a central bracket E³ and is slidably supported upon
the cheeks H, H, constituting the sides of the chamber as shown in
Figure 2B.

page_text: In the front of the iron plate forming the face of the bridge a baffle plate G
is fixed for the treble purpose of preventing the ashes reaching the back of the
firepit, to arrest the air until it is sufficiently heated, and to act as a bed for the
sloping bars.
For domestic or ordinary grates, as illustrated in Figure 8 the application is
somewhat different in construction of the fire bars though being placed in the same
manner may be of different depths most suitable for conducting the air into tho
coals. The fire bars A' are sloped at the top that is the top surface is slanted and
not at right angles to the depth of the firebars while the bars A' are supported
in a vertical direction. The firebars may be drawn together or separated
from each other to ensure varying degrees of draught by means of a drawbar F.
A means of slow combustion may be obtained by bringing the bars close together.
When tubes are used to support the firebars, they may be conducted into the
hot air chamber at the bridge. To regulate the air passing through the tubes or
directly into the hot air chamber at the bridge the opening of the pipes can be
closed with dampers which can be worked automatically or by hand.
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:-
1. The general construction of the bars, substantially as and for the purposes
herein before described and illustrated on the accompanying sheet of drawings.
2. The method of holding the bars in a sloping position, in land and marine
boilers, substantially as described and illustrated on the accompanying sheet of
drawings.
3. The loose plate at the top of the chamber attached to the bridge, substantially
as and for the purposes hereinbefore described and illustrated on the accompanying
sheet of drawings.
4. The construction of the bars for domestic fire grates and method of opening
and closing same, substantially as and for the purposes herein before described and
illustrated on the accompanying sheet of drawings.
5. The manner of placing and arranging the plate bars so as to obviate any
dead points in the fire, substantially as described and illustrated on the accom-
panying sheet of drawings.
Is Out day of May 1000.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Patent Agents.