Improvements in and connected with Furnace Bars.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with Furnace Bars.
I, FREDERIC O'CONNOR PRINCE, of 37 Cursitor Street, London, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
The bar is made with a central tapered web rounded on top, with extending
teeth on both sides, the invention having special reference to the shape and
arrangement of the teeth. The teeth are set upon their web slanting, towards the
bridge of furnace. The front of the teeth facing the draught is made straight,
the other side tapered from top to bottom. The top of the teeth on a vertical
line is rounded, terminating in a kind of a point on the tapered side. The outside
edge of the teeth slightly slants downwards from top for a part of the way and
sharply for the remainder of their length up to the web. In fitting the bars in
furnace, the teeth interlock for a portion of their length but are sufficiently wide
apart to leave the necessary draught to the fire. For bars for locomotive furnaces
the teeth are placed straighter and slant towards the door, or in opposite
direction to those for other furnaces. The side bars, namely, those that come
next the sides of furnace, are made on that side with short teeth and closer together
than those on the other side.
To enable the bars to be freed without pricking, an arrangement is provided to
This is
enable alternate bars to be slightly moved forwards or backwards.
effected by a cross rods with double cams engaging a notch or double projections
on underside of the bars to be moved. The rod is fitted with outside crank handle
to enable the rod to be slightly turned, which causes the cams to move the bars.
Where the bars in a furnace are in two lengths, the moving arrangement would be
double, and connected together by a link, so that one crank handle could move the
two sets together.
Dated this 20th day of August. 1895.
COMPLETE SPECIFICATION.
Improvements in and connected with Furnace Bars.
I, FREDERIC O'CONNOR PRINCE, of 37 Cursitor Street, London, Civil
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 :-
This invention refers to that type of furnace bar having a central tapered web
and teeth extending laterally therefrom ou both sides, the improvement specially
referring to the shape and arrangement of the lateral teeth, and to means for giving
motion to alternate bars when required.
I will now describe my invention with reference to the accompanying drawings,
whereon:
Fig. 1, shews a portion of one of my furnace bars in side elevation,
Fig. 2. is a cross section on the line z. u. of Fig. 1:

page_text: Fig. 3, is a plan of a portion of a bar and shewing part of an adjacent bar
interlocking therewith and
Fig. 4, is a side elevation of one end of a movable fire bar.
Referring more particularly to Figs. 1, 2, and 3, A, is the central web which
may or may not be rounded on the top edge as at A¹, Fig. 2, and is of somewhat
tapered form. The teeth B, are set upon the web A, slanting or inclined towards
the bridge of the furnace, the front surfaces B', of the teeth facing the draught
being made straight, while the opposite sides B 2, are at à greater inclination so
that the teeth taper from top to bottom. The tops of the teeth at B 2*, are rounded
on the tapered side B 2 terminating in a mere acute rounding or point at B 3, on
the tapered side B 2.
The outside edges B4, Fig. 2, of the teeth are shewn as extending downwards
vertically-although they may slant inwardly for a short distance-and then
incline inwards sharply at B5, for the remainder of their depth up to the web A.
In fitting the bars in the furnace the teeth B, interlock for a portion of their
length as shewn at left hand of Fig. 3, but are sufficiently wide apart to leave the
necessary space for the draught to the fire.
For bars for locomotive purposes the teeth should be placed somewhat more
vertically and slant towards the door oppositely to the arrangement for other
furnaces. The side bars namely those that come next the sides of the furnace are
made on the exterior side with shorter teeth, the teeth being also of lesser pitch.
To enable the bars to be freed without pricking I provide an arrangement to
enable alternate bars to be slightly moved forwards or backwards, part of a bar
capable of being so moved is shewn at Fig. 4. C, being an eccentric or cam
keyed on a cross rod or shaft D, and engaging a notch or double projection E,
on the underside of the bar A, to be moved. The rod D, is fitted with outside
crank handle to enable it to be turned thereby giving motion to the bars. Where
the bars in a furnace are in two lengths the moving arrangements would be
double and might be connected together by a link or the like, so that one crank
handle could move the two sets together.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim as my invention is:
1. In furnace bars having a central web, the teeth extending laterally therefrom
inclined in the direction of the draught having the surfaces B₁, facing the draught
made straight, the opposite surfaces B2, being at a greater inclination from top
downwards; the outside top edges B 2*, rounded and the outer edges of the
teeth B 5, tapering laterally to the web at their lower parts and arranged so that
the lateral teeth of one bar take into the spaces between the teeth of the other
bar, substantially as described and illustrated by the accompanying drawings.
2. The combination with furnace bars as claimed by Claim 1, of the mechanical
arrangement such as cam or eccentric for giving backward and forward recipro-
cations to alternate bars.
3. The furnace bars having laterally projecting teeth constructed and arranged
substantially as described and illustrated with reference to the accompanying
drawings.
Dated this 19th day of May 1806