Improvements in or relating to Fire Bars.
Year: 1897

page_text: Date of Application, 31st July, 1897-Accepted, 25th Sept., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Fire Bars.
I, HENRI JOSEPH PIRON, Manufacturer of 50 Rue Bora, Brussels, in the King-
don of Belgium, 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:―
In several previous patents the main features have been described of an efficient
grate for furnaces of all kinds, for the purpose of obtaining the maximum amount
of heat with a given quantity of fuel, as well as for the best utilisation of the
heat developed.
For the purpose of obtaining the greatest amount of heat special fire-bars
forming an open work grate, have been designed, in such manner that the area
of the openings was at least equal to that of the metal, the bars which were
of unusual depth under 'the grate constituting passages for drawing in and
uniformly distributing air to and over the fuel. On the other hand, with a view
to the best utilisation of the heat developed the bars have been so constructed
that they cannot store up or absorb the heat to any great extent to the detriment of
the apparatus or object to be heated, for said purpose the bars are of very small,
cess-section and contain a minimum amount of metal.
For the purpose of easy and efficient stoking, the bars are preferably suspended
so as to make them capable of oscillating, in order to stoke the fire simply by
causing the bars to oscillate or rock.
The model grate has fulfilled all requirements with regard to the above two
objects, and its only drawback was its insufficient durability owing to the extreme
thinness of the bars, causing them to warp under the influence of great heat and
thus destroy the regularity of the cross-section of the air-passages constituted by
them and consequently the regularity of draught and combustion.
The special construction of bars according to the present invention completely
obviates this draw-back, at the same time enabling the bars to be made as thin
as before. The bars are rendered considerably stronger and are prevented from
warping under the influence of heat by a very simple method, consisting in
making the roots of the bars, that is to say the parts a little below the transverse
arms, of sinusoidal or corrugated shape whereby beside the advantages mentioned,
the resistance of the bars to the weight borne by them is also increased.
This new construction of grate bars is clearly shown in the accompanying
drawing, in which
Figure 1 is a diagrammatic plan and Figure 2 cross sectional elevation of the
improved bar. Figure 3 is a diagrammatic plan and Figure 4 a cross-sectional
elevation of a portion of a grate formed of these bars. Figure 5 is a side-elevation
of part of a bar, Figure 6 a constructional plan and Figure 7 cross-section of
the grate.
By examining the diagrammatic views Figures 1 to 4 it will be seen what an
efficient ventilation is obtained owing to the small quantity of metal forming the
grate and owing to the mode of suspension which brings the transverse arms of
the branches A end to end in alternate order with the intervals between them

page_text: in which the air, introduced through the passage formed by the closed space con-
stituted by two contiguous bars rises and passes through the fuel on the grate
without obstruction, so to say, and in great quantities.
The experimental results obtained were so powerful that it was considered
1ecessary to slightly alter the shape of the transverse arms A by giving them an
increased depth as shown in the constructional view (Figure 7) so as to enable
the rising air to become sufficiently heated by contact with them, in order that
it should not arrive in too cold a state at the fuel, and thus affect perfect combus-
tion. The bar shown dotted in Figure 7 and inclined relatively to its suspension
bar M (as shown at the other end of said figure) shows the facility with which
the fire can be raked out or stoked by simply rocking the bars, whereby all cinders
and slag are caused to fall into the passages, from which they can be easily
removed by means of a poker.
In stationary furnaces this swinging can be effected by means of a transverse
bar ninged at the lower ends of the bars, whereas for moving furnaces, such for
instance as on locomotives etc., the swinging often takes place automatically owing
to the vibration of the furnace or engine, so that in such case the grate need never
be out of work for cleaning purposes.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
1. Firebars of the character described in which the downwardly extending
parts S are bent in a sinusoidal or corrugated form at their upper parts adjacent
to the transverse arms A, substantially as and for the purpose described.
2. The combination and arrangement of parts constituting the complete fire
bar substantially as described and illustrated in the accompanying drawings.
Dated this 21+ law of T.... 1007
BOULT & WADE,
Agents for the Applicant.

page_text: Fig. 6.
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