Applicable to other Furnaces.
Year: 1885

page_text: Applicable to other Furnaces.
I, EDWIN SWINDELLS of Macclesfield in the County of Chester Engineer do
hereby declare the nature of said invention for IMPROVEMENTS IN HOLLOW FIRE
BARS OF STEAM BOILERS AND ALSO APPLICABLE TO OTHER FURNACES to be as
follows:-
--
My Invention relates to hollow bars for admitting hot air in the furnace at the
top of the bridge to mix with the unconsumed gases on their passage over the
bridge thereby increasing combustion and consuming smoke.
I make my hollow bars with two channels or passages so that the air travels
twice through the bar before it reaches the bridge, thus increasing its heat. The
bar is straight for nearly its whole length and is curved up at one end, sufficiently
high to form the bridge, and is then curved back and continued horizontal for a
short distance-at this part I fit a loose perforated plate or grid through which the
heated air passes and mixes with the unconsumed gases on their passage over the
bridge. This end of the bar which carries the grid I make at an acute angle
downwards thereby allowing ashes or other debris to fall off with greater ease
which otherwise would choke the grid. I make the end of the bar below the grid
to slope or hollow downwards and at the bottom I make an opening to allow any
ashes, soot; or other debris which may go through the grid to fall into the ash pit
or other receptacle below-I admit the air at an opening in the bottom of the bar,
at or near the end of the straight part, from where rises the curved part to form
the bridge, the lower passage or channel is stopped at this point so as to prevent
the air going up the curved part-the air then passes along the lower channel or
passage and the diaphram which divides the passages not extending to the end of
the bar-it rises at the end of the bar into the top passage then along the top
passage and out at the grid and is thus from its double circulation in the bar
discharged at a greater heat-I make two small openings at the bottom of the bar
one at each end of the straight part to allow any soot or ashes which may get into
the passage to fall out.

page_text: The other part of my Invention consists in making the bar in two divisions or
pieces. I cast one side with the air passages in it; and I fix to it-by bolts or
otherwise a plate in one or more pieces to form the other side, this plate I make
flush with the side of the bar but only of sufficient width to cover the air passages
thus protecting it from the fire. By making the bar in this way I get smoother
channels or passages for the air, and it can be made thinner-than when cast all
in one piece and of equal strength thus allowing more air spaces in the furnace
and thereby increasing combustion on the bars,

page_text: Applicable to other Furnaces.
I EDWIN SWINDELLS of Macclesfield in the County of Chester, Engineer do
hereby declare the nature of said invention for IMPROVEMENTS IN HOLLOW FIRE
BARS OF STEAM BOILERS AND ALSO APPLICABLE TO OTHER FURNACES and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
My invention relates to hollow fire bars for adınitting hot air in the furnace at
the top of the bridge to mix with the unconsumed gases on their passage over the
bridge, thereby increasing combustion and consuming smoke.
My improvements consist in making hollow fire bars with two channels or
passages so that the air travels twice through the bar before it reaches the bridge
thus increasing its heat, also in making openings in the bottom of hollow bars to
allow the dust or debris which may collect in the air passages or channels to fall
into the ashpit, and in making hollow bars in two divisions or parts.
In the accompanying sheet of drawings
Figure 1 represents-in position in the flue of a boiler-an elevation and
longitudinal view of my hollow fire bar, without the plate which forms one of the
divisions or parts of the bar, shewing the two air passages or channels and also
shewing the openings in the passages to allow the debris or dust to fall away.
Figure 2 represents a plan of the bars.
Figure 3 shews a section of the bar made in two divisions.
Figure 4 shews the plate which forms one division of the bar and covers the
channels or passages which are cast in the other division, the plate is fixed to the
bar by bolts or otherwise, through the bolt holes shewn in this figure and in
figure 1.
Figure 5 represents a bar made in two divisions with only one air channel or
passage, and the openings to allow the dust or debris to fall away. The same
letters refer to similar parts as shewn in the different figures.
In figure 1, a represents my hollow bar with two air channels b and c, the air
enters the channels at the openings d, d, d, in the bottom of the bar and at the
farthest end of the bottom channel b. The farthest end of the bar at e I curve
upwards sufficiently high to form the bridge and to this end I fit the perforated
plate or grid f, lying at an acute angle downwards to allow ashes or other debris
to fall off easily, which otherwise would choke the grid, The air enters at the
openings d, passes along the channel 6 in the direction of the arrow, ascends at the
other end of the bar into the top channel c, passes along this channel and out at
the grid f mixing with the unconsumed gases on their passage over the bridge.
I make the end of the bar at g-below the grid-to slope downwards and at the
bottom I make the opening at h to allow any ashes or other debris to fall into the
ashpit.
To allow any debris or dust to fall away from the top channel c I make an
opening into it from the bottom of the bar at i and another opening from the
bottom of the bar atj to clear the debris from the bottom channel b.

page_text: Figure 2 represents a plan of the bars a in position;
bars filling up the front of the furnace.
are the ordinary grate
Figures 3 and 4 represent ny improvement in making hollow bars in two
divisions or parts. Figure 3 is a section of the bar at the dotted line / fig. 1,
shewing the two air channels b. and c. which are cast in the side or division of the
bar marked m.
The plate n figure 4 which forms the other division or part of the bar and which
I make in three pieces-but may be made in one or more pieces,-I fix by bolts or
otherwise to the division of the bar marked m, through the holes shewn in the
plate and at fig. 1 in the division m, of the bar, This plate I make flush with the
side of the bar but only of sufficient width to cover the air passages as shewn at o
figure 3, thus protecting it from the fire.
Figure 5 represents a bar made in two divisions, with only one air passage or
channel, with the opening to admit the air at p and also shews the openings h
and i as shewn at figure 1, to allow the dust or debris to fall away.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
First, making hollow fire bars with two air channels or passages as described
and set forth in the drawings.
Second, making hollow fire bars with openings to allow dust or debris which
may collect in the air channel to fall away as described.
Third, making hollow bars in two divisions or parts for the purpose and in the
manner described.