An Improved reriorated Fire Bar.
Year: 1899

page_text: Date of Application, 11th July, 1899
Complete Specification Left, 31st July, 1899-Accepted, 2nd Sept., 1899
An Improved reriorated Fire Bar.
FRANK MABIN, of 10, Union Street, Plymouth, in the County of Devon,
Stationer, and JOIN HOSKING PETT, of 21, Frankfort Street, Plymouth, in the
County of Devon, Engineer, do hereby declare the nature of this invention to.
be as follows:-
The invention consists of an improved fire bar for furnaces, stoves, ranges,
grates, etc., and has for its object, firstly, a saving of fuel, (a) as the bars
prevent the dropping out of fuel customary with ordinary bars; (b) it enables
the finest coal or other material to be burnt up by means of a great increase
of draught. Secondly,-The greater permanency of the bars, (a) by the under-
part being kept at a lower temperature prevents them from burning or bend-
ing, (b) by a longer period of use without wear.
The improved fire. bar is of an elongated shape, and of any thickness and
length as may be required according to purpose.
.
The bar is perforated vertically along its length with oblong holes, the orifice
of which is largest at the bottom of the bar and decreases at the top, alternately.
varying in lengtli according to the requirement of the bar.
Between each hole at the bottom of the bar is a flange or projection which
greatly strengthens the bar and diminishes the liability to buckle or bend.'
These flanges or projections also help to draw the current of air so as to secure
a greater draught force.
By this means the bars can be placed closer together and thus the finest
coal or other fuel can be completely burnt up, effecting a very great saving
in fuel.
We, FRANK MABIN, of 10, Union Street, Plymouth, in the County of Devon,
and JOIN HOSKING PETT, of 21, Frankfort Street, Plymouth, in the County of
Devon, 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:-
1
Our invention relates to improvements in the construction of perforated

page_text: fire bars for steam boiler and other furnaces, cooking ranges, stoves, grates,
and the like, and has for its object to enable the bars to be placed in closer
proximity to each other than by the ordinary and usual fire bar, while at the
same time increasing the draught so as to be able to burn small or inferior
coal, coke, saw-dust, or other combustible material, while generating a great
amount of heat and hence effecting a considerable economy of fuel!
In the accompanying drawings
Figure 1 is a longitudinal section on line - of Figure 2 and Figure 3, of
one of our improved perforated fire bars:
Figure 2 is a plan of the top of the fire bar.
Figure 3 is a plan of the bottom of the fire bar.
Figure 4 is a vertical cross section on line y-y of Figure 1.
Our improved perforated fire bar is furnished with a series of orifices, a,
which may be either rectangular or elliptical in shape; and conical in form,
that is to say the orifice is smaller both in length and width at the top than
it is at the bottom of the bar. This allows full access of air beneath and draws
up the air as does a chimney, considerably increasing the draught. The same
principle is secured in the apertures between the bars, by the bars being made
narrower at bottom than at the top.
The projections or flanges at the bottom of the bar afford checks to assist in
driving the air up the apertures and orifices, and also strengthen the bar,
while at the same time they prevent the bar from buckling.
The ends and centre of the bars are slightly enlarged, the said bars being
placed contiguously so that these enlarged ends and centre may meet at each
side, leaving only a narrow channel between each pair of adjoining bars.
Nothing but very small cinder or ash can fall through, consequently there is
no loss of fuel when the fire is stirred.
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
'
Our improved perforated fire bar for steam boiler and all other furnaces,
cooking ranges, stoves, grates, and the like, wherever coal, coke, or other com-
bustible material is consumed for heating purposes, arranged and constructed
substantially as herein described and shown, and for the purpose set forth.
FRANK MABIN.
JOIN HOSKING PETT.