Perforated Fire Clay Slabs or Metal Plates (instead of Bars) for Steam Boiler Furnaces.
Year: 1888

page_text: Date of Application, 17th Feb., 1888
Complete Specification Left, 30th Oct., 1888
Complete Specification Accepted, 5th Feb., 1889
PROVISIONAL SPECIFICATION.
Perforated Fire Clay Slabs or Metal Plates (instead of Bars) for
Steam Boiler Furnaces.
I JOHN HARRINGTON HALL of 59 Queen Margaret's Grove Mildmay Park N.
Mercantile Clerk, do hereby declare the nature of this invention to be as
follows :-
:-
Perforated Fire Clay Slabs or Metal Plates (instead of Bars) for steam Boiler
furnaces.
The perforations should be conical shaped so as to allow of the ashes or particles
of coal falling through without clogging the holes. I prefer to use with these
plates a blower or steam jet.
On these plates or slabs the fuel is much more thoroughly consumed than by
any bars I know of at present in use.
Dated this 15th day of February 1888.
JOHN HARRINGTON HALL.

page_text: Steam Boiler Furnaces.
I, JOHN HARRINGTON HALL of 59 Queen Margaret's Grove, Mildmay Park, N.,
Clerk, 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 :-
This invention relates to the employment of perforated plates in place of the
usual fire-bars in various kinds of furnaces. The plates may be carried on bearers
in a similar manner to the ordinary fire-bars at the ends and sides and can be
made in sections or one entire plate provided for the whole of the bottom of the
furnace. Where it is desired to be able to easily "dump" the fire I sometimes
employ these plates at the sides and have a few ordinary fire-bars in the centre which
can be readily moved; in general however I prefer to employ nothing but the plates.
The construction of these plates will be readily understood from the accompanying
drawings in which,
Figure 1 is a plan of the top side of the plate.
Figure 2 an inverted plan showing the underside thereof, and
Figure 3 a section through a furnace provided with the plate and showing the
'conical construction of the holes which I prefer to adopt.
A represents the solid portion of the plate which may be made of fire clay or similar
refractory material or of metal, and B represent the perforations or openings on the
top side of the plate, C showing where the holes are enlarged toward the underside in
conical form to prevent clogging of the holes. I prefer to enclose the ash-pit or spaco
under the furnace and to employ a forced draught which may be provided by means
of a blower or steam jet although these plates can be used without the jets. By using
these plates with a forced draught I find that the clinkers do not set fast upon the
plates and can be moved with the greatest facility. The fuel is more thoroughly
consumed and there is less waste by improperly consumed fuel falling through. The
tapered form of the holes is also advantageous as allowing the air under pressure to
approach the top side of the plate in considerable quantity so that there is not much
loss by the friction which would result from passing the air through a small hole whose
length was the whole thickness of the plate.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
The combination with a furnace of a plate or bottom such as A having holes or
perforations B enlarged towards the underside substantially as described and illustrated
in the accompanying drawings.
ليمو
1000