Improvements in Furnace Bars or Fire Grates.
Year: 1891

page_text: Date of Application, 14th Aug., 1891-Accepted, 19th Sept., 1891
COMPLETE SPECIFICATION.
Improvements in Furnace Bars or Fire Grates.
I, JAMES WARD Junior, of the firm of J. Ward & Sons, of 11 Broad Street,
Worcester in the County of Worcester, Hot Water Engineers, do hereby
declare the nature of my said 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 has for its object: improvements in furnace bars or fire grates:
which are suitable for use in hot water apparatus, and steam-boilers, muffles,
ordinary domestic boilers, and indeed in every position where fire bars have
hitherto been applicable. The great difficulty in such fire bars or grates is to
obtain an ample supply of air through the grate to the fire to produce the
required amount of combustion with a reasonable amount of fire grate area and
at the same time to maintain the fire-bars or grate so cool as to prevent the hot
fuel from forming serious clinkers upon the fire bars or grate. Now the object
of my invention is to effect these desirable ends without unduly adding to-the first
cost though the first cost of the grate is not a serious matter as compared
with the continual expense caused by imperfect combustion which of course means
extravagance in fuel.
In order that my invention may be clearly understood and more easily carried
into practical effect, I have appended hereunto a double sized sheet of drawings
upon which is illustrated one of my fire bars and a section of grate surface composed
of several of these bars brought together as they work in practice. Of course
the length and size of the bars and the number of holes and particular con-
figuration of the holes and parts may be greatly varied without departing from
the essence of the invention.
The following are the details of the various figures upon the drawings:-
Figure 1, is a side elevation of one of my fire bars or a section of one of my
grates hereinafter to be more fully described.
Figure 2, is a plan of three bars or sections brought together to form one small
grate or a part of a grate.
the
Figure 3, is a cross section through the three fire bars, on the line A-B for
purpose of showing the full details of the perforations which are important.
Figure 4, is a longitudinal section through one of the bars and also shewing the
perforations e'.
The fire bar E is cast in one piece of metal and the parts e², et, are cored out
generally unless special plant or moulding boxes are constructed to make them in
quantities for the sake of cheapness in which case the pattern would be jointed on
the dotted line M-N and a separate box or parting would be made on that line
so that the part e, e, would leave its own core in the mould when the patterns
are nicely made and thus the expense would be only slightly greater than
in ordinary plain bars or they may be easily made without coreing by "plate
moulding."
The bars have the usual ears or projecting pieces e² to give the desired air space e³
between each bar but over and above this form holes e¹ either square, oblong,
oval, round or other shape along each bar or section. These holes widen out as
shewn by the dotted lines e Figure 1 and also in cross section as shown by the full
lines at Figure 3. At a convenient portion of the depth these holes e' widen out
into complete holes e which afford the most perfect opportunity for the air to
ascend to and through the holes e' to the various parts of the fire and fuel. It will
also be noticed that the bar has a considerable bevilled or tapered portion e³ on
each side leading up to the complete hule e¹. This is for the purpose of allowing

page_text: the air more freely to find its way to the said holes e¹. The effect of this arrange-
ment is that no dead fuel or clinker can well accumulate on the top of the bars and
thus the fire is kept clean and an abundance of air admitted to all parts thereof.
The recess in the edges of the bar greatly assist in regard to air space & to break
up the clinkers but I do not bind myself to the particular configuration of them as
they may be V shape, semi-circular &c.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The improvements in furnace bars or fire grates having the holes such as e¹ and e
and bevilled portions leading up to the same and the notches e in combination
with the other portions substantially as shown upon the drawings and herein
set forth.
Dated this 13th day of August 1891
JOHN
KENDRICK,
77, Colmore Row, Birmingham, Agent for Applicant.