Improvements in and connected with Furnace Fire Grates and Bars therefor.
Year: 1892

page_text: Date of Application, 2nd July, 1892
Complete Specification Left, 4th Apr., 1893—Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in and connected with Furnace Fire Grates and Bars
therefor.
EDWARD JAMES NEWITT of 14 Albert Square, Stockwell in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:
This invention which relates to furnace fire grates refers (1) to the construction of
the fire bars in sections and the disposition of same in the grate in such manner as-
to provide continuous and uninterrupted air spaces between them; (2) to the manner
in which the sections of the bars are coupled together and (3) to the general
arrangement of the grate.
In accordance with this invention I make each section of the fire bars rectangular
on the top and tapering towards the bottom. Preferably I cast the front sections
of three or other convenient number of fire bars, in one with a flat plate and arrange.
these plates side by side in the front of the furnace so as to form a dead plate or
coking plate for the fuel. In front of this coking plate and immediately behind'
the front of the furnace I fit a grid on which a subsidiary fire may be lighted and
kept burning so that the fuel as it is charged into the furnace and falls on to the
coking plate will there be heated between the main and subsidiary fires and the,
coking of the fuel thereby accelerated. In some cases however may dispense..
with this grid and its subsidiary fire and may carry the coking plate close up to...
the front of the furnace.
The ends of the sections of the bars are square and they are provided on their:
under sides with hooks or notches. These hooks or notches are made to engage
with horizontal projections in a separate shoe piece which rests upon fixed bearers.
The notches on the under sides of the bars and the projections in the shoe piece are,
so disposed that the ends of the adjacent sections of a bar butt end on to each other.
The shoe piece or pieces in which the bars rest may be made to carry one or more
bars and extends only about one third up from the bottom of the bars so that
the air space for the rest of the distance up and from the front to the rear of the.
bar is uninterrupted.
When the bars of the fire grate are required to move alternately into and out of
the furnace, I provide the shoe piece or pieces with rollers so that they form bogies.
which travel to and fro on the fixed bearers, and carry the bars with them. I
also couple the front of one or more of the bars with the grid when such is used.
by means of a link, so that the rear end of said grid will be raised by the forward
motion of the bars. The grid may be pivotted at its forward end or it may be
otherwise loosely jointed so as to allow for this raising motion which will tend to shake
up and stoke the subsidiary fire on said grid and also to break up the connection,
formed by the coal caking between the two fires.
Dated this 2nd day of July 1892.
1.
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for, the Applicant.

page_text: GUME TEST ST MGLEICATION.
Improvements in and connected with Furnace Fire Grates and Bars
therefor.
EDWARD JAMES NEWITT of 14 Albert Square, Stockwell, in the County of
Surrey 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 which relates to furnace fire grates refers (1) to the construction
of the fire bars in sections and the disposition of same in the grate in such manner
as to provide continuous and uninterrupted air spaces between them; (2) to the
manner in which the sections of the bars are connected together; and (3) to the
general arrangement of the grate.
In the accompanying drawings which are furnished in illustration of this
invention,
Figure 1 is a part plan and Figure 2 is a longitudinal section of a furnace grate
having moveable bars;
Figures 3 and 4 are details of the device for connecting the sections of three
adjacent moveable bars together; and
Figures 5 and 6 shew a modification adapted for grates with fixed bars.
The same letters of reference are used to indicate the corresponding parts in all
the figures.
Referring first to Figures 1 to 4 which shew the invention as applied to a fire
grate, the bars of which are required to move alternately into and out of the
furnace, I make each section of the fire bars A rectangular on the top and tapering
towards the bottom. Preferably cast the front sections of three or other con-
venient number of fire bars A in one with a flat plate B and arrange these plates
side by side in the front of the furnace so as to form a dead plate or coking plate
for the fuel (see Figure 1). In front of this coking plate and immediately behind
the front C of the furnace 1 fit a grid D on which a subsidiary fire may be lighted
and kept burning so that the fuel as it is charged into the furnace and falls on
to the coking plate, will there be heated between the main and subsidiary fires and
the coking of the fuel thereby accelerated.
In some cases however, I may
dispense with this grid D and its subsidiary fire and may carry the coking plate.
close up to the front C of the furnace.
The ends of the sections of the bars are squared, that is to say, at right angles
to the top surface, and they are provided on their under sides with hooks or
notches E, (see Figure 2). These hooks or notches are made to engage with
horizontal projections G in a separate shoe piece F which rests upon fixed bearers.
Figure 3 is a perspective view of a shoe piece for connecting the sections of three
consecutive moveable bars and Figure 4 is a transverse section through this shoe
piece F shewing the three bars in position. The notches E on the undersides of
the bars and the projections G in the shoe piece F are so disposed that when the
adjacent sections of a bar are in position, their ends butt against each other. The
shoe piece or pieces in which the bars rest may be made to carry one or more
bars, and extends only about one third up from the bottom of the bars (as shewn
in Figures 2 and 4) so that the air space for the rest of the distance up and from
the front to the rear of the bar is, uninterrupted. By this arrangement the free
- and uninterrupted longitudinal passage of air from end to end of the furnace is
permitted, and the whole of the bar is kept cool, thus ensuring great durability,
whilst at the same time the equal and regular combustion of the fuel on the grate
is maintained.
To reduce the friction provide the shoe piece or pieces with rollers (as
shewn in Figures 2, and 4) so that they form bogies which travel to and fro on the
fixed bearers of the fire grate and carry the bars with them. I also couple the

page_text: front of one or more of the bars with the grid D when such is used, by means of a
link K (see Figure 2) so that the rear end of said grid will be raised by the
forward motion of the bars. The grid D may be pivotted at its forward end or it
may be otherwise loosely jointed so as to allow for this raising motion which will
tend to shake up and stoke the subsidiary fire on said grid and also to break up the
connection formed by the coal caking between the two fires.
Referring to Figures 5 and 6. Where the fire bars are not required to move, I lay
the sections of the bars on the shoe piece F' shewn in Figures 5 and 6 which in
this case does not require the horizontal projections as there is no pushing or pulling
of the bars. I also dispense with the formation of hooks on the undersides of the
bars and in their stead I form the bars with a small ledge or partial notch E'
which fits against the central web F of the shoe piece F. This shoe piece may
be secured to or formed on the ordinary bearers of the furnace or it may be made
sufficiently long to reach from side to side of the furnace, as shewn in Figure 6, so
as to take all the bars, and its base F³ made to rest upon brackets secured to the
sides of the furnace, in which case it forms a bearer for the furnace.
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 :-
1. For furnace fire grates having bars made in sections longitudinally of the
grate connecting the sections together by shoe pieces supported on or secured to
the bearers of the furnace, said shoe pieces being so made as to allow the free and
uninterrupted longitudinal passage of air above them and between the bars substan-
tially as described and illustrated in the accompanying drawings.
2. For furnace fire grates having bars made in sections longitudinally of the grate,
a furnace bearer provided with recesses to receive the ends of the sections of the
bars, said bearer being made so as to allow the free and uninterrupted longitudinal
passage of air above it and between the bars substantially as described with reference
to Figures 5 and 6 of the accompanying drawings.
.
3. The improved furnace fire grate constructed and arranged substantially in the
manner herein described and illustrated and for the purpose stated.
Dated this 4th day of April 1893.
F. W. Golby,
EDWD. J. NEWITT.
36, Chancery Lane, London, W.C., Patent Agent for the Applicant.