IMPROVEMENTS IN ROCKING FIRE-BARS FOR STEAM BOILER AND OTHER. FURNACES
Year: 1869

page_text: COMPLETE SPECIFICATION filed by Peter Murray at the Office
of the Commissioners of Patents, with his Petition and Declaration,
on the 17th July 1869, pursuant to, the 9th Section of the Patent.
Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
MURRAY, of Levis, Province of Quebec, Canada, Marine Engineer, at
present temporarily residing at 123, Chancery Lane, in the County of
Middlesex, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
ROCKING FIRE-BARS FOR STEAM BOILER AND OTHER. FURNACES," and have
petitioned Her Majesty to grant unto me, my executors, administrators,.
and assigns Her Royal Letters Patent for the same, and have made
solemn Declaration that I am the true and first Inventor thereof!.
NOW KNOW YE that I, the said Peter Murray, do hereby declare
that the following Complete Specification, under my hand and seal, fully.
describes and ascertains the nature of the said Invention, and in what
manner the same is to be performed in and by the following statement,

page_text: reference being had to the accompanying Sheet of Drawings (that is to
say):
:-
My Invention relates to the construction of rocking fire-bars for steam
boiler and other furnaces, so that the fires may be shaken up when
required and the consumed dust and ashes cleaned out, thus preventing
the formation of slag or clinker in the furnace, and considerably
economising the consumption of fuel..
The chief advantage resulting from my Invention is that steam is
generated much faster with a less consumption of fuel and less labour by
shaking up the fires without the necessity of using the slice or poker or
continually opening the doors for the purpose of crowding or hurrying
up the fires. by constantly adding more fuel.
My Invention consists, firstly, in constructing the grate bars in the
form of a bridge so as to retain the air and keep the sides of the bars
cool, thereby preventing warping and avoiding the disadvantage of the
liquid matter in the coal adhering or welding to the heating surface of
the said bars, thus choking the air spaces and preventing the free passage
of oxygen to the fuel.
Secondly. In the construction and arrangement of two or more trans-
verse rocking bars extending from side to side or end to end of the
furnace, and having toes or projections cast or otherwise fixed thercon
on each side alternately for the purpose of alternately raising each fire-
bar in a vertical direction the whole length or width of the furnace, the
said bars being always supported by the toes on the rockers.
And, thirdly. In the construction and arrangement of the fire-bars and
rockers so that they will all work together without being attached by
means of bolts or pins, and so as to preserve all the working parts from
the action of the fire or from the deposit of dust, clinker, or other
injurious matter.
In order that my Invention may be clearly understood I will proceed
to describe the same with reference to the accompanying Sheet of
Drawings, in which Fig. 1 shews a plan of a furnace with my improved
fire-bars and rockers adapted thereto; Fig. 2, a longitudinal section of
the same; and Fig. 3, a transverse section of the same.
a, a, are the sides and ends of the furnace; b, b, the grate bars; c, c,
the toes or projections alternately cast on or affixed to the rocking
shafts d, d, which are supported by and turn in bearings or brackets e, e;

page_text: f is a lever attached to the front transverse rocker for the purpose of
rocking the grate bars b, b, as hereafter described; 9, 9, are cranks cast
or otherwise fixed to the transverse rockers, the said cranks being
connected together by rods h, h, so that both rockers will oscillate by
one actuation of the lever f.
In Figs. 2 and 3 the said lever is shewn depressed, and each
alternate fire-bar raised by the action of the toes or projections c, c,
bearing against the under part of the bars b, b, thus raising them in a
vertical direction the whole length of the furnace without leaving their
supports, they being always supported by the toes or projections, as.
shewn. Notches or recesses i, i, are formed in the grate bars b, b, to act
as guides during the oscillating or rocking motion, the said recesses
fitting over the circular part of the rocking bars d, d. It will be.
observed that the part j of the front rocking bar extends down into the
ash-pit, thus avoiding the necessity of constantly opening the furnace
door to rake or otherwise operate upon the fire.
Having thus described the nature and particulars of my said Inven-
tion, I claim the improvements in rocking fire-bars for steam boiler and
other furnaces, as herein described and illustrated in the accompanying
Sheet of Drawings.
In witness whereof, I, the said Peter Murray, have hereunto set
my hand and seal, this 15th day of July, in the year of our
Lord One thousand eight hundred and sixty-nine.