IMPROVEMENTS IN FURNACE BARS AND THEIR BEARERS
Year: 1877

page_text: LETTERS PATENT to John Turnpenney, of Bullough Square, Leeds, in the
County of York, Engineer, for the Invention of "IMPROVEMENTS IN FURNACE
BARS AND THEIR BEARERS."
Sealed the 1st May 1877, and dated the 6th April 1877.
"
PROVISIONAL SPECIFICATION left by the said John Turnpenney at the
Office of the Commissioners of Patents on the 6th April 1877.
JOHN TURNPENNEY, of Bullough Square, Leeds, in the County of York, Engineer.
'IMPROVEMENTS IN FURNACE BARS AND THEIR BEARERS."
My Invention relates to a construction of furnace bars and their bearers in such
a manner that whilst the bars rest firmly in position they have freedom to expand
and contract without being subject to longitudinal strain. For this purpose I
slope the end of each bar on the under side, and rest it on a sloping ledge formed
on the dead plate, or on the bearer for the bar.
In cases where there are two lengths of bars in a furnace I provide a sloping
ledge on the inner lip of the dead plate to take the front ends of the front bars,
and a sloping bearing bar at the bridge to take the back ends of the back bars.
The middle bearing bar may in this case be flat, but I prefer to make it with lips
projecting upwards, taking into notches in the bars so as to hold them steady at
their meeting ends, their other ends being free to move on their sloping beds.
To protect the ends of the bars next the bridge I prefer to make a ledge project
from the bridge over them at sufficient height to permit them to move freely on the
sloping face of the bearing bar.

page_text: My Invention relates to a construction of furnace bars and their bearers in such
a manner that whilst the bars rest firmly in position they have freedom to expand
and contract without being subject to longitudinal strain. For this purpose I slope
the end of each bar on the under side, and rest it on a sloping ledge formed on the
dead plate, or on the bearer for the bar.
In cases where there are two lengths of bars in a furnace I provide a sloping
ledge on the inner lip of the dead plate to take the front ends of the front bars,
and a sloping bearing bar at the bridge to take the back ends of the back bars.
The middle bearing bar may in this case be flat, but I prefer to make it with lips
projecting upwards, taking into notches in the bars so as to hold them steady at
their meeting ends, their other ends being free to move on their sloping beds.
To protect the ends of the bars next the bridge I prefer to make a ledge project
from the bridge over them at sufficient height to permit them to move freely on the
sloping face of the hearing har
Fig. 1 represents a longitudinal section of a furnace grate having two lengths of
bars according to my Invention, Fig. 2 being an elevation to an enlarged scale of
one of these bars.
A is the dead plate, and B is the bridge bearer, each of which is sloped down-
wards at its inner edge, so as to receive the sloped ends of the bars C which rest
thereon, remaining free to move as the bars expand or contract; D is the middle
bearing bar, which is made with two lips projecting upwards into notches c pro-
vided near the meeting ends of the fire-bars, so as to hold those ends firmly in
position. The dead plate A and back bearer B may be held by the bolts E securely
in their relative position. At the bridge F I prefer to provide a ledge projecting
over the ends of the fire-bars, so as to protect them while it leaves them free to
move. The bars constructed and supported as above described may be single, or
they may be made in the form of double or multiple bars, that is to say, two or
more cast in one piece, as shewn by the plan, Fig. 3, and enlarged transverse section,
Fig. 4, of a double bar.
Having thus described the nature of my Invention, and in what manner the
same is to be performed, I claim,-
First. Constructing fire-bars with sloped ends to rest on sloped bearers, substan-
tially as and for the purpose hercin set forth.
Second. Protecting the ends of fire-bars next the furnace bridge by a ledge pro-
jecting over them, substantially as herein described.
Third. In fire-grates consisting of two lengths of bars securing the meeting ends
of the bars by notching them on to lips of a bearing bar, while the other ends are
left free, substantially as herein described.
In witness whereof, I, the said John Turnpenney, have hereunto set my
hand and seal, this Fourth day of July, in the year of our Lord One
thousand eight hundred and seventy-seven.
TATIV
ANTITATATE