An Improved Fire Bar for Furnaces.
Year: 1890

page_text: Date of Application, 27th Aug., 1890
Complete Specification Left, 22nd May, 1891-Accepted, 11th July, 1891
PROVISIONAL SPECIFICATION.
An Improved Fire Bar for Furnaces.
I, JOHN HOSKIN PETT, of 41 Fore Street Redruth Cornwall Engineer do
hereby declare the nature of this invention to be as follows:-
My invention consists of an improved fire bar for furnaces and has for its object,
Firstly-A saving of coals, as it enables the finest coals to be burnt up. Secondly
-An increase of draught to the furnace and Thirdly, the greater permanency of
the bars, as the under part is kept comparatively cool thus preventing them from
burning or bending.
I form my improved fire bar in an elongated shape and of any thickness that may
be required, at the bottom of which is a Hange or projection running centrally for
its whole length being deepest in the centre of the bar and decreasing in depth
towards the ends, thereby giving greater strength to the bar and diminishing its
liability to buckle or bend.
The bar is perforated vertically with holes circular on plan and the vertical
section of which is after the manner of truncated cones of which the greater diameter
is at the bottom of the bar, these holes continue through the entire thickness of the
bar being in rows upon either side of the flange.
It will thus be seen that by reason of the conical shaped holes I am able to get a
much greater draught to the fire in my furnace, and can then place my bars closer
together which enables the finest coals to be burnt up-and producing a saving of
at least 20 per cent. of coal. My improved fire bar is thoroughly adapted to vertical,
horizontal and Cornish boilers and boilers of all description for marine and mining
purposes and wherever coal is used, I do not restrict myself to the number or the
place of the conical shaped holes which I form in my bar.
Dated this 27th day of August 1890
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Fire Bar for Furnaces.
I, JOHN HOSKIN PETT of 41 Fore Street Redruth, Cornwall, Engineer 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:-
My invention relates to improvements in the construction of fire bars for steam
boiler and other furnaces and has for its object to enable the bars to be placed in
closer proximity to one another than heretofore, while at the same time increasing
the draft so as to be able to burn small or inferior coal, while generating a great
amount of heat and hence effecting a considerable economy of fuel.
In the accompanying drawings
Figure 1 is a broken longitudinal section on line a. x. of Figure 2 of one of my
improved fire bars, the latter figure being a plan thereof.
Figure 3 is a vertical cross section at an enlarged scale on line
y. Y of Figure 1.
My improved fire bar is furnished with parellel series of tapered circular
holes a. a
&c. arranged throughout at equal intervals, and forming series of
truncated cones. The diameter of the said holes is somewhat smaller at the top
than at the bottom; thus allowing full access underneath to the air; and thus
increasing considerably the draft.

page_text: The fire bar is furnished as usual with a central web which in this case is deeper
in the middle than at the ends, so as to prevent the bar from buckling, as clearly
shown in Figure 3. The ends e of the fire bars are slightly enlarged as shown in
Figure 2, the said bars being placed contigously so that these enlarged ends may
meet at each side, leaving only a narrow channel between each pair of adjoining
bars. There is no loss of coals when the fire is stirred.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is :-
My improved fire-bar for steam boilers, and all other furnaces, stoves, grates,
and the like, wherever coal is consumed for heating purposes, arranged and
constructed substantially as herein described, and shown, and for the purpose set
forth.
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.