Improvements in Mechanical Stokers and Furnace Bars."
Year: 1890

page_text: Date of Application, 3rd July, 1890
Complete Specification Left, 1st Apr., 1891-Accepted, 16th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Mechanical Stokers and Furnace Bars."
ANDREW BELL 298 Lower Broughton Road, Manchester Engineer &
Mechanical Stoker Maker do hereby declare the nature of this invention to be
as follows:-
1st. The pusher which moves the coal forward into the furnace is rounded on the
pushing side.
2nd. The furnace bar is constructed in two parts and connected by a tapered pin
and socket on the principal of the iron bedstead attachment.
3rd. On the underside of furnace bar is cast a projection of the wedge shape
which imparts to the furnace bar when in motion a treadle movement to break
up fire.
4th. The shape of furnace bar to which we give preference has a flange on both
sides running longitudinally with the bar and air spaces or slots of various lengths
running lengthwise also.
'
5th. The firebricks used in the stoker are lined with iron to strengthen them.
COMPLETE SPECIFICATION.
Improvements in Mechanical Stokers and Furnace Bars.
I, ANDREW BELL of 298 Lower Broughton Road Manchester in the County of
Lancaster Engineer 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 :-
My invention relates to improvements in the construction of furnace bars, and is
applicable either to ordinary furnaces, or to mechanical stokers.
The object of my invention is to obviate the necessity of renewing the whole of a
furnace fire bar if said bar has been burnt at one part only.
I attain the object as set forth by the means hereinafter described, and as
illustrated in the accompanying sheet of drawings:
Fig. 1 is side view, and Fig. 2 plan of a complete furnace bar:
Figs. 3 and 4 are plan views of pin and socket ends of portions of furnace bars:
Figs. 5 and 6 are side views of the same.
Similar letters refer to similar parts throughout the several views.
In applying my improvements, I construct furnace bars preferably of two lengths,
but said furnace bars may be formed of a greater number of lengths. When the
furnace bar is constructed of two lengths, the longer part a may form nearly the
entire portion of the bar, the shorter length being placed in the position where
the heat is greatest and consequently most likely to be burnt and destroyed. I form
one end of the longer length of said furnace bar with a pin c preferably of a semi-
circular taper construction, and I form one end of the shorter length of said bar
with a socket d corresponding in size and shape to the pin c, in order that said pin
may fit therein.
When the pin c on end of the longer portion a of furnace bar is inserted into
the socket d at the end of the shorter portion, a complete length of furnace bar
is formed the joint where the longer and shorter lengths a and b of furnace bar A
are connected may either be made to fit tight by the socket d being cast open and

page_text: without a bottom, or said joint may be made to fit loose by the bottom of socket
being closed and the pin c resting thereon.
In order to prevent the passage of cold air between the bars or between the teeth
of said bars, and thereby lessen the amount of heating power, I make the short
length b of bar A with a heel or raised part e which causes a certain amount of
fuel to be always retained of that part, and not to be pushed off at the end of furnace
bar, or taper off at end of bar, as is the case with the ordinary furnace bars: by
these means the furnace bars are always covered with fire or ashes to the depth of
said heel.
On the underside of each length of bar at the parts where said lengths of bar
are coupled together 1 form a projection with an inclined plane g. As the furnace
bar A moves backwards and forwards horizontally over the supporting bar, the
aforesaid projection causes the furnace bar to rise and fall as it ascends and descends
on this inclined plane, thus imparting to the furnace bar a treadle motion, and by
these means breaking up the fire and increasing the heating power.
Furnace bars as hereinbefore described may be made of a greater number
of lengths by increasing the number of the pins and sockets c and d forming
joints.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed I declare that what
I claim is.
1st. In furnace bars that are employed either in ordinary furnaces or mechanical
stokers, a connection by means of a pin and socket, of two or more parts to
form said bar, for the purpose and in the manner substantially as hereinbefore
described.
2nd. In furnace bars that are employed either in ordinary furnaces or mechanical
stokers, a raised heel e for the purpose and in the manner substantially as herein-
before described.
3rd. In furnace bars that are employed either in ordinary furnaces or mechanical
stokers, the means employed for obtaining a rising and falling motion, for the
purpose and in the manner substantially as hereinbefore described.
Dated this 30th day of March 1891.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.