IMPROVEMENTS IN THE CONSTRUCTION OF FIRE-BARS FOR FURNACES
Year: 1877

page_text: LETTERS PATENT to John Robinson, of Cheadle, in the County of Chester,
for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF FIRE-BARS
FOR FURNACES.”
Sealed the 17th May 1878, and dated the 20th November 1877.
PROVISIONAL SPECIFICATION left by the said John Robinson at the Office
of the Commissioners of Patents on the 20th November 1877.
JOHN ROBINSON, of Cheadle, in the County of Chester. " IMPROVEMENTS IN
THE CONSTRUCTION OF FIRE-BARS FOR FURNACES."
The objects of this Invention are to make the fire-bars lighter and more durable,
and to obtain a greater air space than heretofore in a given area of grate, and.
consequently to improve the combustion of the fuel. This I propose to effect
by the use of light rods or bars of Bessemer or other steel in combination with
cast iron.
The cast iron is used in the form of a framing or casing to contain and support
the steel rods or bars.
In some cases I form a longitudinal cast-iron frame the length of the fire-bars,
with three or more transverse plates or divisions connecting the longitudinal sides;
and I perforate these plates with holes corresponding with the section of the steel
rods or bars and pass the latter longitudinally through them, so that they support
the said rods or bars. Or sometimes I lay the steel rods or bars in the mould and
run in the molten cast iron, so as to form the frame and secure the rods or bars in
their places.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Robinson in the Great Seal Patent Office on the 18th May
1878.
JOHN ROBINSON, of Cheadle, in the County of Chester.
THE CONSTRUCTION OF FIRE-BARS FOR FURNACES."
"
IMPROVEMENTS IN
The objects of this Invention are to make the fire-bars lighter and more durable,
and to obtain a greater air space than heretofore in a given area of grate, and
consequently to improve the combustion of the fuel. This I propose to effect
by the use of light rods or bars of Bessemer or other steel in combination with
cast iron.
Such being the nature and object of my said Invention I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect; and in order that the same may be clearly understood
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have marked
the same with figures and letters of reference corresponding with those in the
following explanation thereof.
In the annexed Drawing Fig. 1 is a longitudinal section; Fig. 2, an end view ;
Fig. 3, a transverse section; and Fig. 4, a plan view, illustrating the construction
of fire-bars according to my Invention.
The cast iron is used in the form of a framing or casing to contain and support
the steel rods or bars.
In some cases I form a longitudinal cast-iron frame a, a, the length of the fire-
bars, with three or more transverse plates or divisions b, b, connecting the longi-
tudinal sides; and I perforate these plates with holes corresponding with the
section of the steel rods or bars 'c, c, and pass the latter longitudinally through
them, so that they support the said rods or bars c, c, openings d, d, being left in
one end (see Fig. 2) for that purpose. Or sometimes I lay the steel rods or
bars c, c, in the mould and run in the molten cast iron, so as to form the frame and
secure the rods or bars in their places.
In some cases also I propose (instead of making the bars of the full length) to
form in shorter sections, so that any portion thereof can be renewed as required..
Having now described the nature and object of iny said Invention, together with
the manner in which the same is to be or may be performed or carried into
practical effect, I wish it to be understood that I claim as my Invention the con-
struction of fire-bars for furnaces by the combination of light rods or bars of
Bessemer or other steel with cast iron, substantially as herein-before described and
illustrated by the Drawing annexed.
In witness whereof, I, the said John Robinson, have hereunto set my hand
and seal, this Sixteenth day of May, in the year of our Lord One thousand
eight hundred and seventy-eight.