Improvements in the Construction of Continuous Fire Grates for Steam Boiler and other Furnaces.
Year: 1895

page_text: Date of Application, 17th Oct., 1895
Complete Specification Lelt, 17th July, 1896-Accepted, 22nd Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Continuous Fire Grates for
Steam Boiler and other Furnaces.
I, WILLIAM HEYWOOD, of Stourbridge Road, Halesowen, Worcestershire,
Chain Manufacturer do hereby declare the nature of this invention to be as
follows:-
This invention consists of the hereindescribed improvements in continuous fire
grates for steam boiler and other furnaces so as to economise fuel and consume the
smoke.
In carrying out my invention 1 provide an endless chain or belt of fire bars”
consisting of a number of fire bars rather longer than the width of the fire grate
and arranged across the same (that is at right angles to the usual position of fire.
bars in a furnace) and connected together at their ends by short links forming the..
sides of the said belt or band of bars. The parts of the fire bars between the said
links stand up higher than those portions where the links are situated and these
latter are covered by slabs of fire brick supported by the side walls of the ash pit.
or flue under the fire grate these alabs covering the said links and forming a level,
surface with the higher parts of the fire bars on which the fuel lies. At each end
of all or any convenient number of the fire bars there are rollers made V-shaped at
their periphery or flat or otherwise formed so as to run along rails or bearers which,
I provide at the sides of the ash pit or fluo underneath the fire, brick slabs. There,
is a horizontal shaft at the front end and another horizontal shaft at the back end:
of the furnace adapted to turn in suitable bearings and each provided with two
toothed wheels of a shape to engage with the bars and the links connecting the bars.
together so that the ehain of bars will pass round and engage with these wheels.
The fuel is placed on the part of the belt of bara nearer to the furnace door and
as,it is consumed the shafts are turned by a lever or hy gearing or any convenient.
means so as to gradually move the burning fuel farther into the furnace so that by.
the time it arrives at the end of the furnace it is consumed and the ashes and
cinders pass under a lifting door or elide into a closed ash pit the empty bars
moving back towards the front of the furnace, in an inverted position their rollers
running along suitable guides fixed on the bottom of the ash pit or flue.
Dated this 16th day of October 1895.
COMPLETE SPECIFICATION.
Improvements in the Construction of Continuous Fire Grates for
Steam Boiler and other Fürnaces.
I, WILLIAM HEYWOOD, of Stourbridge Road, Halesowen, Worcestershire,
Chain Manufacturer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly describoil-and ascertained in
and by the following statement :—
This invention has reference to contidiious fire gratës (for steam boiler and ōthät
:

page_text: furnaces) of the kind which consists of an endless chain or belt of bars passing
round toothed wheels or drums arranged to be turned when required to impart
forward movement to the bars and the fuel thereon. A fire grato of this kind is
described in the Specification of my prior Letters Patent No. 7595/94. My present
invention consists of the hereindescribed improved construction and arrangement
of the endless belt of bars and the means for supporting the same in the furnace
and flue under the furnace.
I will describe my invention by referring to the accompanying drawings on
which
Fig. 1 is a sectional side elevation and Fig. 2 is a cross sectional olovation of
my invention applied to an externally fired boiler of the egg ended type; in Fig. 1
the parts are represented as broken so as to shew the apparatus on a large scalo;
Fig. 3 is a sectional elevation and Fig. 4 is a cruss sectional elevation of my
invention applied to a Cornish boiler; in Fig. 3 the parts are represented ns broken
so as to shew them on a large scale.
The same letters of reference indicate the same or corresponding parts in all the
figures of the drawings.
Referring firstly more particularly to Figs. 1 and 2, I provide an endless chain
or belt A of fire bars consisting of a number of fire bars marked B made rather
longer than the width of the fire grate and arranged across the same (that is to say
at right angles to the usual position of fire bars in a furnace) and connected
together at their ends by the short links C forming chains at each side of the belt
or band of bars. These links C may be ordinary chain links as shewn and to every
alternate pair of links one of the fire bars B is bolted as by pins the heads of
which engage under the horizontal links C of the chain and which pass through
feet 6' formed on the ends of the bars. The parts B of the fire bars between
the links C'stand up higher than those portions where the links C are situated and
thene latter are covered by the slabs D D of fire brick supported by the side:
walls of the ash pit or flue underneath the fire grate these slabs D¹ D' covering
the links C and forming a level surface (see Fig. 2) with the higher parts B of the
fire bars on which the fuel lies. At each end of all or any convenient number of
fire bars B there are rollers E¹ E made V-shaped on their periphery or flat or
otherwise formed so as to run along the rails or bearers FF which I provide at
the sides of the ash pit or flue underneath the fire brick slabs B' B'. There is a
hörizontal shaft G¹ at the front end of the furnace and another horizontal shaft G'
at the back end of the furnace adapted to turn in suitable bearings. The shaft G
is provided with two toothed wheels and the shaft G is provided with two
similar toothed wheels A made of the shape as shewn to engage with the links C
of the bans B so that the chain of bars will pass round and engage with these
wheels ''. :
:
The fuel is placed on the part of the belt of bars A nearer to the furnace door [
and as the fuel is cousumed, the shaft G' may be turned' by a lever fitting in a
sprocket wheel on one end of the same (not shewn on the drawing) or the shalt
may be turned by gearing or by any other means in the direction indicated by the
arrow in Fig. 1 thereby imparting forward motion to the bars and gradually
moving the burning fuel farther into the furnace so that by the time it arrives at
the end of the furnace it is consumed and the ashes and cinders pass under a lifting
door J or slide into the closed ash pit K the empty bars moving backwards in an
inverted position their rolls E' E' running along suitable guides L. which are fixed
on the bottom of the ash-pit or flue K.
When applying my invention to the Turuace of a Cornish boiler I arrange for the
rollers E E of the bars to run along angle section guides F which are fixed to
the sides of the flue. In this case as there has to be more space between the upper
forward part of the belt of bars and the lower return part of the same, I prefer for
the belt of bars to be carried by two pairs of toothed wheels A'' at the front and
two similar pairs at the back of the boiler mounted on corresponding shafts as
shewn in Fig. 8, otherwise if only two of these wheels are used at the front as in

page_text: the arrangement shewn by Figs. 1 and 2 the wheels would be larger and in the
way of the stoker.
Having now particularly described and ascertained the nature of this inven
tion and in the manner the same is to be performed, I declare that what I
claim is :-
1. In a steam boiler furnace or other furnace the improved construction of the
endless band or belt of fire bars made of cross fire bara ₺ fixed to the two ondless
side chains C adapted to gear with wheels or drums, substantially as set forth.
2. In a steam boiler or other furnace the combination of the cross fire bars B,.
the two endless side chains C fixed to the ends of the cross bars B, the wheels or
drums gearing with the side chains, and the rollers on the ends of the bars running
along guides in the furnace, all substantially and for the purpose set forth.
Dated this 16th day of July 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.