IMPROVE- MENTS IN FURNACES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said John Redgate at the Office
of the Commissioners of Patents on the 3rd December 1881.
JOHN REDGATE, of the Town and County of the Town of Nottingham. "IMPROVE-
MENTS IN FURNACES."
My improvements relate to a new form of bearing bar and fire bar, both equally
applicable to the flues of furnaces of a circular or other shape. In each furnace I
employ two or more bearing bars lying in the direction of the length of the fire
box or flue. The ends of these bearing bars are formed on the underside to fit the
inner edge of the dead plate at one end and the bridge bearer at the other end;
each bearer bar is reticulated on that side nearest the side of the fire box or flue,
and on the opposite side on the lower edge a recessed bracket is cast provided with
a set screw for adjustment; the position of this bracket varies according to the
length of the fire bars employed in the recesses of the bearing bars; one end of a
slotted cross bar rests; such arrangement effectually prevents the expansion of the
cross bar from forcing outwards the sides of the due. The ends of some of the
fire bars rest upon the dead plate at one end, and on one side of the slotted cross
bar at the other end; the remainder of the fire bars rest at one end on the bridge
bearer, and at the other end on the opposite sido of the slotted cross bar before
named. Each fire bar is formed of the requisite shape at each end to rest on the
bearing surfaces. Each fire bar is constructed as follows:-The depth of the
bar will depend upon its length, but the lower edge is thin and corrugated its
whole length; the bar being thicker at the top is reversely reticulated on each side;
besides which each corrugation of the bottom edge terminates in two or more
reversely inclined reticulations at the top edge; by such means the draughts of air
between the reticulations are thus caused to either impinge upon each other or
cross one another according to the inclination of the reticulations, thus producing
great heat and less slag than heretofore.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Redgate in the Great Seal Patent Office on the 25th May 1882.
JOHN REDGATE, of the Town and County of the Town of Nottingham. " IMPROVE-
MENTS IN FURNACES."
My improvements relate to a new form of bearing bar and fire bar, both equally
applicable to the flues of furnaces of a circular or other shape. In each furnace I
employ two or more bearing bars lying in the direction of the length of the fire
box or flue. The ends of these bearing bars are formed on the underside to fit the
inner edge of the dead plate at one end and the bridge bearer at the other end;
each bearer bar is reticulated on that side nearest the side of the fire box or flue,
and on the opposite side on the lower edge a recessed bracket is cast provided with
a set screw for adjustment; the position of this bracket varies according to the
length of the fire bars employed in the recesses of the bearing bars; one end of a
slotted cross bar rests; such arrangement effectually prevents the expansion of the
cross bar from forcing outwards the sides of the flue. The ends of some of the
fire bars rest upon the dead plate at one end, and on one side of the slotted cross bar
at the other end; the remainder of the fire bars rest at one end on the bridge bearer,
and at the other end on the opposite side of the slotted cross bar before named.
Each fire bar is formed of the requisite shape at each end to rest on the bearing
surfaces. Each fire bar is constructed as follows:-The depth of the bar will
depend upon its length, but the lower edge is thin and corrugated its whole length;
the bar being thicker at the top is reversely reticulated on each side; besides which
each corrugation of the bottom edge terminates in two or more reversely inclined
reticulations at the top edge; by such means the draughts of air between the
reticulations are thus caused to either impinge upon each other or cross one
another according to the inclination of the reticulations, thus producing great heat
and less slag than heretofore.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan of my improved bearing bar and fire bar.
Figure 2 a side view showing a central bearing bar and two dead plates in
section, and two fire bars in aide view.
Figure 3 is an underside view of one fire bar.
My improvements relate to a new forin of bearing bar and fire bar, both equally
applicable to the flues of furnaces of a circular or other shape. In each furnaco
I employ two or more bearing bars A lying in the direction of the length
of the fire box or flue. The ends of these bearing bars are formed on the
underside to fit the inner edge of the dead plate B at one end, and the bridge
bearer C at the other end; each bearer bar is reticulated on that side nearest the
side of the fire box or flue, and on the opposite side on the lower edge a recessed
bracket A' is cast provided with a set screw for adjustment; the position of this
bracket varies according to the length of the fire bars employed in the recesses of
the bearing bars; one end of a slotted cross bar D rests; such arrangement effectually
prevents the expansion of the cross bar from forcing outwards the sides of the Qluo.
The ends of some of the fire bars E rest upon the dead plate B or upon a slotted
cross bar D' at one end, and on one side of the slotted cross bar D at the other
end; the remainder of the fire bars rest at one end on the bridge bearer C or upon
a slotted cross bar D, and at the other end on the opposite side of the slotted cross
bar D before named.

page_text: Each fire bar is formed of the requisite shape at each end to rest on the bearing
surfaces, each bar being constructed as follows:-The depth of the bar will depend
upon its length, but the lower edge is thin and corrugated its whole length; the bar
being thicker at the top is reversely reticulated on each side; besides which each
corrugation of the bottom edge terminates in two or more reversely inclined
reticulations at the top edge. Bars so constructed I make of cast iron, steel, or
rolled iron; by such means the draughts of air between the reticulations are thus
caused to either impinge upon each other or cross one another according to the -
inclination of the reticulations, thereby producing greater heat and less alag than
heretofore, and a more perfect combustion.
Having thus described the nature of my said Invention and the manner of
performing the same, I declare that I claim,-
The general arrangement and combination of bearing bars A, D, D', and D², and
fire bars E, constructed as herein before described and illustrated in the Drawings
annexed.
In witness whereof, I, the said John Redgate, have hereunto set my hand
and scal, this Twenty third day of May, in the year of our Lord Ono
thousand eight hundred and eighty two
Witness,
H. W. GOUGH, C.E.,
Nottingham.
JOHN REDGATE. (L.S.)