IMPROVEMENTS IN FURNACE BARS
Year: 1871

page_text: LETTERS PATENT to William Heesom, of 48, Nile Street, Sunderland,
in the County of Durham, for the Invention of "IMPROVEMENTS IN
FURNACE BARS."
Sealed the 7th October 1871, and dated the 26th April 1871.
PROVISIONAL SPECIFICATION left by the said William Heesom at the
Office of the Commissioners of Patents, with his Petition, on the
26th April 1871.
I, WILLIAM HEESOM, of 48, Nile Street, Sunderland, in the County of
Durham, do hereby declare the nature of the said Invention for "Im-
PROVEMENTS IN FURNACE BARS," to be as follows :-
This Invention has for its object improvements in furnace bars.
Heretofore furnace bars have been mounted on axes at their ends, so
that a rocking motion may be imparted to them, and such rocking bars
have also been formed with arms standing out from their opposite sides;
when however such furnace bars have been employed the top edges of
the several arms on the two opposite sides of the bars. have been on a

page_text: ⚫line with one another, and the arms projecting from the two sides of the
bar have been opposite to one another.
According to my Invention I arrange the arms which project from
the two sides of the bar to come alternately, as shewn at Figure 1 of
the Drawings annexed, in place of being opposite to one another, as
heretofore, by which the supply of air to the fuel resting on the bars is
improved, and the bars are less liable to twist when in use; and in order
to facilitate the escape of slag from above the furnace bars I form the
top edge of each of the projecting arms to slope downwards, as shewn in
the end view of the bar at Figure 2, whereby if the bars arc set at a
short distance from one another, as shewn at Figure 3, the slag always
tends to run towards the space left between two adjacent bars, and to
pass away between them when the bars are caused to rock.
In order to equalize the supply of air over the whole of the fire-grate
I form an air hole through each of the projecting arms, as is shewn at
Figure 2.
In the Drawings the pivot or axle at the end of cach bar is marked A;
B is a square projection, on which a handle B' can be placed to impart a
rocking motion to the bars; C is the air course running through the
several arms; D is an iron pin cast in the bar; E is a connecting rod
coupling together the pins D of the several bars.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Heesom in the Great Seal Patent Office
on the 26th October 1871.
TO ALL TO WHOM THESE PRESENTS SHALL' COME, I, WILLIAM 2
HEESOM, of 48, Nile Strect, Sunderland, in the County of Durham, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-sixth day of April, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty- 3
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Heesom, Her special license
that I, the said William Heesom, my executors, administrators, and
assigns, or such others as I, the said William Heesom, my executors,
administrators, and assigns, should at any time agree with, and no 3

page_text: others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ircland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
FURNACE BARS," upon the condition (amongst others) that I, the said
William Heesom, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be
filed in the Great Seal Patent Office within six calendar monthis next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Hecsom, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement thereof, that is to say:-
This Invention has for its object improvements in furnace bars.
Heretofore furnace bars have been mounted on axes at their ends,
so that a rocking motion may be imparted to them, and such rocking
bars have also been formed with arms standing out from their opposite
sides. When, however, such furnace bars have been employed the top
edges of the several arms on the two opposite sides of the bars have
been on a line with one another, and the arms projecting from the two
sides of the bar have been opposite to one another.
According to my Invention, I arrange the arms which project from
the two sides of the bar to come alternately, as shewn at Figure 1 of
the Drawings annexed, in place of being opposite to one another as
heretofore, by which the supply of air to the fuel resting on the bars
is improved and the bars are less liable to twist when in use; and in
order to facilitate the escape of slag from above the furnace bars I form
the top edge of each of the projecting arms to slope downwards, as
shewn in the end view of the bar at Figure 2, whereby if the bars are
set at a short distance from one another, as shewn at Figure 3, which
represents a horizontal section of a furnace fitted with fire-bars con-
structed according to my Invention, the slag always tends to run
towards the space left between two adjacent bars, and to pass away
between them when the bars are caused to rock.
In order to equalize the supply of air over the whole of the fire-grate
an air hole may, if desired, be formed through each of the projecting

page_text: arms, as is shewn at Figure 2, but this is not essential, as they may be
formed without such air holes, as shewn in the perspective view of the
end of one of my fire-bars at Figure 4.
Figure 5 represents a front view of part of a steam boiler furnace
fitted with my improved fire-bar. This view shews how the bars are 5
to be connected with one another, so that when a rocking motion is
given to one of them the others are rocked also.
In each of the Figures the pivot or axle at the end of each bar is
marked A, and the bearing bars in which their ends are received are
marked A';
B is a square projection on one of the bars, on to which a 10
handle B¹ can be placed to impart a rocking motion to it; C is the
air course, which may, as before stated, be formed if desired through
the several arms of each bar; D is an iron pin cast in the bar; E is a.
connecting rod coupling together the pins D of the several bars.
Having thus described the nature of my Invention, and the manner l
of performing the same, I would have it understood that what I claim
as my improvements in furnace bars is, the forming the bars with arms
projecting in an alternate manner from their opposite sides, in place of
the arms being opposite to one another, as heretoforc.
I also claim the forming the upper surfaces of the projecting arms to 20
slope downwards, as herein described.
In witness whereof, I, the said William Heesom, have hereunto
set my hand and seal, this Twenty-fourth day of October, in
the year of our Lord One thousand eight hundred and seventy-
one
2