AN IMPROVED FURNACE GRATE
Year: 1877

page_text: LETTERS PATENT to William Arena Martin, of 17, Charterhouse Street, Holborn
Circus, London, in the County of Middlesex, Engineer, for the Invention of
"AN IMPROVED FURNACE GRATE."
Sealed the 23rd November 1877, and dated the 23rd July 1877.
PROVISIONAL SPECIFICATION left by the said William Arena Martin at the
Office of the Commissioners of Patents on the 23rd July 1877.
WILLIAM ARENA MARTIN, of 17, Charterhouse Street, Holborn Circus, London,
in the County of Middlesex, Engineer. "AN IMPROVED FURNACE GRATE,"
.
This Invention has for its objects the improvement of combustion in steam boilers,
and other furnaces, and increased facilities in the working and management of the
same. To effect these objects I use fire-bars, by preference, of taper section, and
which may be of either cast or wrought iron, and serrated or teethed cross-bearing
bars for the purpose of supporting the said fire-bars and holding them in position.
The said cross-bearing bars are fixed in such a position as to cause the fire-bars,
which they support, to be on a lower level than the fire-plate or bottom of the fire-
door of the furnace.
By the use of the above-mentioned cross-bearing bars I am enabled to dispense
with the lugs, flanges, and flattened ends, with which fire-bars are commonly made,.
and by the use of a plain bar supported by the said cross-bearing bars in the manner
herein described; the following are among the advantages to be obtained :-
First. A flat stoking iron or poker can be introduced between the fire-bars without
involving the opening of the fire-door for the purpose of rousing or stirring the fire
and clearing the air spaces, the front cross-bearing bar serving as a fulcrum or,
leverage for the said stoking iron or poker.
Second. The increased admission of fresh air to the fire from the fire-bars.
'
Third. The immunity from damage from expansion and contraction.

page_text: Fourth. One or more of the fire-bars can be drawn out, or even the entire set be
removed; and replaced by fresh fire-bars whilst the furnace is working and without
opening the fire-door.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Arena Martin in the Great Seal Patent Office on the 28th
November 1877.
WILLIAM ARENA MARTIN, of 17, Charterhouse Street, Holborn Circus, London,
in the County of Middlesex, Engineer. "AN IMPROVED FURNACE GRATE."
دو
This Invention has for its objects the improvement of combustion in steam boilers
and other furnaces, and increased facilities in the working and management of the
same. To effect these objects I construct and arrange my "Improved Furnace
Grate as follows:-I use fire-bars of plain construction, and which may be of
either wrought or cast iron, and of various shapes, but by preference of taper section.
The said fire-bars fit into and rest upon serrated or teethed bearing bars, which are
fixed in such a position as to cause the said fire-bars, which they support, to be on
a lower level than the fire-plate or bottom of the fire-door of the furnace.
The said bearing-bars, besides serving to support the aforesaid fire-bars, hold and
retain them in their proper positions, and by this means I am enabled to dispense
with the lugs, flanges, and flattened ends with which fire-bars are commonly made.
I do not confine myself to constructing the said bearing-bar with the serrated or
teethed part at the top only, but I propose in some cases to use two or several sets
of "teeth," which may be of various "pitches" or gauges, so that by reversing the
said bearing bars and causing a different set of teeth to face upwards, the relative
distances between each of the said fire-bars are changed; or the said teeth may
completely encircle the said bearing-bars, taking the form of pulleys or sheaves
which would be loose on the central part of the said bearing-bars.
By the use of the said "Improved Furnace Grate" the following are among the
advantages to be obtained :-
First. A flat stoking iron or poker can be introduced between the said fire-bars
into the body of the fuel (without involving the opening of the fire-door) for the
purpose of rousing or stirring the fire and clearing the air spaces, the front bearing-
bar serving as a fulcrum or leverage for the said stoking iron or poker.
⚫ Second. The increased admission of fresh air to the fire between the fire-bars.
Third. The immunity from damage by expansion and contraction.
Fourth. One or more of the said fire-bars can be drawn out, or even the entire
set can be removed and replaced by fresh fire-bars whilst the furnace is working
and without opening the fire-door.
In order that the nature of my said Invention and the manner in which the same
is to be performed may be clearly described and ascertained, this Specification is
accompanied by a Sheet of Drawings having figures and letters of reference marked
thereupon, the like letter being used to denote a similar or corresponding part in
each Figure.
The Drawings represent the application of my Invention to a tubular boiler,
Figure 1 being a front view, and Figure 2 a longitudinal section of the same.

page_text: a denotes the aforesaid fire-bars and the manner in which they are applied or fitted
in a furnace in connection with the said bearing-bars b.
Figures 3, 5, and 7 are detail Drawings of the afore-mentioned bearing-bars,
showing the various forms and modifications of the same as herein in this Specifi-
cation described; Figures 4, 6, and 8 are transverse sections of the same.
Having now described and ascertained the nature of my said Invention and the
means by which the same is effected, I wish it to be understood that what I
claim is,―
An "Improved Furnace Grate" consisting of fire-bars, arranged as herein-before
described, and supported in the furnace by teethed or serrated bearing-bars.
I also claim the form, construction, and application of the teethed or serrated
bearing-bars, as herein-before described and in the appended Drawings illustrated.
In witness whereof, I, the said William Arena Martin, have hereunto set my
hand and seal, this Twenty-eighth day of November, in the year of our
Lord One thousand eight hundred and seventy-seven.
Witness,
H. J. DARLEY.
WILLIAM ARENA MARTIN. (LS.)