Improvements in Furnaces and Furnace Fire-bars.
Year: 1889

page_text: Date of Application, 18th Mar., 1889
Complete Specification Left, 16th Nov., 1889-Accepted, 21st Dec.. 1889
PROVISIONAL SPECIFICATION.
Improvements in Furnaces and Furnace Fire-bars.
ISAAC SHAW of Chester Street, Brampton near Chesterfield in the County of
Derby Ironfounder and Engineer do hereby declare the nature of this invention to be
as follows:-
Improvements in Furnace and Furnace Fire Bars.
My improved Furnace Bars are made of Iron, Steel or any other suitable material
and are formed in two halves to avoid the expense of corcing and so that placed
together in a proper position they form a hollow bar either straight corrugated or
any other shape required. They are made in such a way as to admit of being
provided with Teeth intersecting each other so as to avoid loss of fuel and moreover
by constructing the body of the bars in such a manner as to make them much
narrower on the top than the bottom edge a much greater influx of air to the fire is
permitted. The front end of the bars to be made more widely open than any other
part of the bar to admit free access of air under the front bearer. The air passage
to be continuous for the whole length of the bars so as to convey air into or
through the bridge which may be made hollow and provided with a valve and other
appliances so as to regulate the current of air if required which comes through the
bars and so provide an efficient smoke consumer. The bar sections are firmly
hitched together and in and to the Bearings.
The objects of the above invention are the consumption of smoke, the saving of
fuel and the prevention of the bars from warping or burning.
Dated this 16th day of March 1884
ISAAC SHAW.
COMPLETE SPECIFICATION.
Improvements in Furnaces and Furnace Fire-bars.
I ISAAC SHAW of Victoria Iron Works Brampton Chesterfield in the County of
Derby 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
The object of this invention is to provide an improved fire bar for furnaces grates
and the like which while being of simple construction is portable removable and
capable of being formed or of allowing the furnace to be formed in any desirable
shape and will permit of air passing longitudinally through the bar so as to convey
it into and through the bridge and at the same time allow of free access and influx
of air to the fuel from underneath said influx of air being regulated by means
of valves or other equivalent devices by these means an efficient smoke consumer is
provided.
I may also so construct portions of the furnace as to give the fullest effect to
my fire-bar, the whole arrangement being designed to effect more perfect combustion,
a saving in fuel and to prevent such firebars becoming warped or burnt.
In carrying out my invention I form my fire bar in two halves or sections
longitudinally and so that when placed placed together side by side they form a
hollow bar thus avoiding the expense of coreing. I also form them in convenient
lengths jointed as hereafter described so that they may be readily removed or
renewed.

page_text: Referring to the accompanying drawings and to the figures and letters of reference
marked thereon.
Figure 1 is a side elevation of the front end of one of my bars shewing projection A
to fit upon the ledge or flange of the dead plate.
Figure 2 is a sectional elevation of the ends of two bars and hollow bearing shewing
method of jointing.
Figure 3 is a transverse section through the two halves of my bar when in
position shewing projections or teeth in the direction of line a-a Figure 9.
Figure 4 is a part elevation of the front end of one half of a bar shewing
internal formation.
Figure 5 is a similar elevation shewing the joint.
•
Figure 6 shews the end of the bar built into the bridge and the arrangement of
valve.
Figure 7 is a plan of the bars when fixed in position shewing spaces between
teeth or projections and position of joints.
Figure 8 is a horizontal section or plan through bars on line - Figure 3.
Figure 9 is a plan of the top of a bar.
The sections of bars destined to form the front end of my complete bar are
constructed as shewn at A Figures 1 and 4 and the projections A fit upon the
dead plate of the fire hole which may be formed with a flange or ledge to receive
them so as to allow space for the influx of air, the air entrance being enlarged
for that purpose as shewn in Figures 1 and 4. The bars may be made in convenient
lengths and jointed as shewn in Figures 2, 5, 7, 8, 9. In making the joint I form
the jointing ends with lugs B B which are dropped into hollow bearers C built
into or attached to the sides of the furnace the object of this being to prevent the
unjointing of bar sections. Projections D on the jointing ends of one bar fit
into corresponding recesses E in the end of the next bar as shewn in Figures 5
and 8.
The bridge F (Figure 6) is provided with a valve such as G which may be
operated by a lever or handle H working through hollow air spaces J¹ of the bars
and firmly secured in any position by a rack L and catch M (see Figure 4). The
air passing through the bars tend to cool them preventing clinkers from adhering
thereto and igniting the smoke at the bridge.
Projecting from either side of the bar at or near the top thereof 1 form teeth
or corrugations i so arranged that when a series of bars are fitted together the
teeth or corrugations on one bar fit between the teeth or corrugations on the other
bars leaving sufficient space J between them when so fixed for passage of air and
furnace refuse.
The bodies of the bars are made narrower on the top K (see Figure 3) than
on the bottom edge thus permitting a greater influx of air to the fire.
It will be seen that the spaces between the bars at the bottom are much greater
than those between the teeth or corrugations I hence any refuse clinker &c. which
passes through or between the upper portions of bar will more readily pass between
the lower ones thus obviating the clogging of bars. The halves of the bars are
fixed tegether by means of rivets or in any other suitable manner.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same I declare that what I claim is
:-
First In furnace grates and the like the use of longitudinally divided hollow
fire bars substantially as herein described and illustrated by the accompanying
drawings.
Second-The longitudinally divided hollow fire bar in two halves with projecting
teeth or corrugations fitting into corresponding recesses.
Third-The method of regulating the supply of air through the bar by means
of a valve at the bridge end of same operated by a rod or other device through

page_text: the bar to the front end thereof substantially as described and illustrated by the
accompanying drawings.
Fourth The general arrangement of firebars and and other portions of furnaces
substantially as herein described and illustrated as and for the purposes described.
Dated this 4th day of September 1889.
POPPLEWELL & Co.,
Agents for the Applicant.