Improvements in Fire Bars for Boiler and other Furnaces and Grates.
Year: 1897

page_text: Date of Application, 2nd Feb., 1897-Accepted, 1st May, 1897
Improvements in Fire Bars for Boiler and other Furnaces
and Grates.
•
A communication from LOUIS PEELLAERT, of 27 Quai Flamand, Antwerp, in the
Kingdom of Belgium, Artisan.
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent 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:—
The object of the present invention is to produce a fire bar which does not
prevent the access of air from below to any point of the grate. That is to say the
bar is of the same thickness throughout its length and the raised parts or
shoulders which are necessary in the centre of the bars to keep them at a
desired distance apart are replaced in the present invention by hollowed ribs or
knobs or projections of any suitable form and section beaten or pressed out of
the body of the bar in such manner that the same rib or knob forming a pro-
jection on one side of the bar forms a corresponding recess on the other. Tho
ribs or projections are arranged alternately nearer the one or other end of the bar
EO as not to have recesses opposite projections.
Figures 1 to 8 of the accompanying drawings illustrate a construction according
to the present invention that is to say a construction with hollow "ribs" and
Figures 11B 1º 1º 2ª 2ª 34 3B 44 5^ 6ª show a second construction. Figure 1 is
a longitudinal elevation of such a fire bar. A is the bar a the hollow rib b the end
resting on the central cross-bar B of the grate (Figures 6 to 8) o is the end resting
on the sido support C.
Figure 2 is a plan of the bar A and Figure 3 the view of the same seen from
below Figure 4 is a cross section of a bar ou line X X of Figure 7 and Figure 5
a similar section on line yy of Figure 6.
Figures 6, 7 and 8 show a grate composed of such bars respectively in vertical
section in plan in under side view.
It will be seen that the bars are arranged so that they rest their ends con
supports C of the grate without being able to move whereas they are supported at
their ends b on the support B in such manner as to be free to move one bar of one
half of the grate forms a distance piece for keeping apart two bars of the other half
of the grato.
The advantage of such arrangement consists in enabling the bars fixed at one of
their ends to the supports of the grate to freely expand or contract on the centre-
support of the grate.
The whole of this new form of construction of fire-bar stamped out of one piece
of metal and the special arrangement of the grate formed of such bars has thus the
great advantage of proventing the bars from becoming hotter in ono place than in
another as they are of the same thickuess throughout their length and do not possess
any shoulder or other thickened portion which would prevent the free passage of
air between them. In consequence of this they wear much less and last better and
longer than any other hitherto known fire-bars.
The second modification or construction differs from the first in replacing the
hollow rib or projection formed out of the body of the bar by hollowed knobs or
enlargements of any suitable shape and section being formed on the body of the

page_text: bar as well as in replacing the shoulders formed at the ends for the purpose of
keeping the bars apart by similar knobs or hollow" buttons."
Figure 1 is an elevation of a bar A provided in the middle with a hollowed
rib b formed from the body of the bar and forming a shoulder for keeping the bar
apart in the middle while the distance apart at the fixed ends is maintained by two
hollowed knobs a and a 1 which are beaten out in opposite directions.
Instead of hollow rib b this bar may also be provided with circular or other
knobs formed at about the centre of the bar.
Figs. 2 and 2ª relate to the arrangement shown in Fig. 14 and 1º and show the
bar as seen from the top.
Fig. 14 and 1 show the same devices applied to a corrugated bar instead of a
straight one in elevation and Fig. 2ª and 34 the same as viewed from the top and
from below.
In Fig. 1 the bar A¹ is provided with knobs a and a' formed in the middle and
at the fixed end and in Figure 1B it has a greater number of such knobs, two
knobs d of which shown in dotted linos illustrate an intermediate arrangement for
special cases.
Figure 1º illustrates different cross-sections which may be given to the stamped
out projections.
Figure 4 shows in elevation and Figure 5 in plan, another method of fixing
straight bars A constituting the grating and provided with hollowed ribs bb' in the
middle and knobs a' a at the fixed ends.
Figure 6 is a plan of a grate formed of corrugated bars A' provided with projec-
tions a a' formed in the body of the bar.
Another form of construction consists also in the arrangement of the hollowed
rib, shown in preceding figures in an inclined position, in a vertical position as in
Figure 9 and 11 where it is stamped out of the bar A' and indicated by the letter a³,
a being the ond projections.
Generally speaking, this invention consists therefore, as far as regards the device
for keeping the bars apart in the middle or at any other suitable point, in the use
of a hollow rib in a bar, said rib being arranged at any desired point of the bar.
Another improvement consists in the device for keeping apart the ends of the
bars, for which
Instead of such purpose it is preferred to use hollow "knobs" of any form.
use may also be made of two hollow ribs at each
end a' a" a' see Figures 10 to 14, arranged in a different direction, so that they
serve as support for the bar which can thus remain upright all by itself.
Figure 10 illustrates the end of a bar A' provided with elongated recesses a® aª
which in Figure 11 are continued downwards thus forming grooves a aⓇ arranged
on opposite sides of the bar. In Figure 12 the hollow grooves a' have a more
square shape, than those in Figure 11 which are oval.
Figures 13 and 14 show the end of a bar provided with oppositely arranged
hollowed ribs in side olevation and in plan.
Of course, the shape of the ribs, their number and arrangement may vary
according to requirements or other circumstances.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. A. straight or corrugated fire-bar formed of one piece of metal for boiler and
other furnaces and grates, provided with hollowed ribs which serve to keep two
contiguous fire bars at a desired distance apart, and allowing free passage to the
air, substantially as described and illustrated in various modifications in the accom-
panying drawings.
2. In a fire bar such as described, the construction, instead of hollowed ribs,
of round, oval square, or other shaped knobs or recesses substantially as
described.
•
3. The use of hollowed ribs or knobs as described for the purpose of maintaining

page_text: straight or corrugated bars of grates at a certain distance apart at their ends, as
well as in the middle or at any other desired point of the bar substantially as
described.
4. The construction and arrangement at the ends of fire bara, of hollowed ribs
or "knobs" of any desired form projecting in opposite directions, so that said
ribs or knobs afford a support to the bars which in this manner will be enabled to
stand upright upon their supports and at the same time serve to maintain the bara
at a desired distance apart substantially as described.
BOULT & WADE,
Agents for the Applicant.