Applied to Mechanical Stoking or Hand Firing.
Year: 1885

page_text: Applied to Mechanical Stoking or Hand Firing.
We GEORGE WILLIAM HAWKSLEY, Engineer and Boiler Manufacturer, and
THOMAS ANDREWS, Engineer both of the. Brightside Boiler Works, Sheffield in
the County of York do hereby declare the nature of our said invention for
IMPROVEMENTS IN THE ARRANGEMENT OF FURNACE BARS TO BE APPLIED TO
MECHANICAL STOKING OR HAND FIRING, to be as follows:-
Our invention refers to improvements in the construction and arrangement of
furnace bars, and is particularly applicable to be used in combination with the
system of automatic mechanical stoking described in the Specification of Patent
No 170 the object being to obtain increased grate bar surface, and otherwise render
the system more effective.
In order to reduce both the first cost and also the cost of repairs of the apparatus
used in this system of automatic feeding the furnace with fuel (as applied to steain
boiler furnaces), the number of spiral feed screws was reduced from three as shown
in the drawings of Patent N° 170, 1876, to only one, which was placed in a.central
position. The result was not satisfactory, the fuel was not distributed equally
over the grate bars, being much deeper near the screw opening, and thin at the
sides.
Our present invention is to remedy the above defect, and in its application to
the furnace of a steam boiler, for example, we fix one of the taper screws or
"Helix Furnace Feeders "-with its driving apparatus in a central position, the
screw being as usual under the furnace bars, and the feeding trough immediately
over it.
Instead of the bars being level or horizontal from the edges of the feeding trough
to the sides of the furnace or flue, we fix them at an angle inclining downwards,
and extending halfway to the sides or thereabouts, the remainder being level. Thus
the fuel as it is forced over the edges of the feed trough slides down the inclined
bars on to the level bars. The level portion is formed by a longitudinal bar
suspended upon trunnions which we preferably arrange out of the centre, and upon
which the bar may be turned by a handle or other means for the purpose of allowing
the slag or clinkers to drop through.
In some cases we may carry the inclined surface of the bars to the outer sides
without any level surface.
We may apply our invention to a furnaces having a series of feeding screws.

page_text: Improvements in the Arrangement of Furnace Bars, to be
Applied to Mechanical Stoking or Hand Firing.
We GEORGE WILLIAM HAWKSLEY, Engineer and Boiler Manufacturer, and
THOMAS ANDREWS Engineer, both of the Brightside Boiler Works Sheffield in
the County of York do hereby declare the nature of our invention for IMPROVE-
MENTS. IN THE ARRANGEMENT OF FURNACE BARS, TO BE APPLIED TO MECHANICAL
STOKING, OR HAND FIRING and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement, that
is to say :-
Our invention relates to improvements in the construction and arrangement of
furnace-bars, such arrangement or arrangements being particularly adapted for use
in combination with the system of automatic mechanical stoking described in the
Specification of Patent No 1707 the chief object being to obtain increased grate bar
surface, and also to render the system more effective.
In carrying out our invention in its application to the furnaces of Steam Boilers
we have for example shown it in the annexed sheet of drawings applied to a double
flue boiler in combination with the Helix Feeder.
Fig. 1. is a front elevation of a Boiler fitted with the "Helix" selfacting furnace
feeder.
Fig. 2, is a sectional view of above showing the arrangement of the bars.
Fig. 3, is a sectional side elevation of boiler showing tilting bar arrangement.
Fig. 4, is a plan of grate.
Fig. 5, side elevation of reciprocating bar arrangement.
Figs 6 & 7, are modifications of the arrangement of grate bars.
Similar letters of reference indicate similar parts in any of the figures in which
they occur.
In carrying our invention into effect in its application to the furnaces of a double
flued boiler (for example) which we have illustrated in Figs 1. 2. 3. 4. 5 of the
Drawings, it will be seen that we prefer to employ only one of the Helix screw
feeders which we place in a central position. A is the screw, B the feed trough
C being the mouth of the trough; on each side of the mouth of the trough C, we
fix longitudinal grate-bars D the upper surfaces of which incline downwards to the
lower level of the next bars E or F.
The bars E are supported by, and may be partially rotated upon axles or
trunnions by means of a handle or key applied to the squared end of the front
axle G; thus the said bars may when desired be tilted over (or partially over) and
slag, clinkers, or other burnt refuse, be shot through the aperture opened by the
action of the bar, and the furnace be expeditiously cleared.
The axles of the tilting bars may be placed either in the centre of the bar as in
Fig. 6, E, so that the bars may be tilted on either side, or they may be placed near
the edge as shown in Fig. 2, this side arrangement permits of the largest aperture
with a given width of bar.
The bars F, are a series of longitudinal grate bars, having a reciprocating or
an advancing and retiring motiou, as well as a rising and falling motion.
These

page_text: motions take place in each bar alternately, thus when one bar is advancing the next
bar is retiring..
The movement of the bars is preferably obtained by means of a cam or cams I
shown in Fig. 5 and the rising movement by inclines or wedges but this does not
form any part of our invention.
When the furnace is at work, the coal gravitates from the hopper to the screw
feeder A, is carried along the trough B, and forced upwards through the mouth C,
falling upon the inclined bars D, and sliding down on to the lower horizontal bars E
or F. This arrangement gives increased area of grate bar surface, and air openings,
advantages readily understood and appreciated by those conversant with the
construction of Furnaces.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is
1. In the construction of furnaces, fitted with the “Helix” screw feeder, the
arrangement of the furnace bars next to the feed trough, at an angle, inclining
down to the lower level of the next bars which are horizontal, for the purpose
specified and substantially as herein befefore described and illustrated.
"
2. In furnaces fitted with the "Helix' screw feeder, the arrangement of the
furnace bars, immediately next to the feed trough, inclining downwards, in
combination with longitudinal tilting bars, or with bars having a longitudinal
reciprocating movement, for the purpose specified and substantially as herein before
described and illustrated.
"
3. In reheating Furnaces, the arrangement of longitudinal tilting bars in com-
bination with the Helix" screw feeder, substantially as described and as illustrated
in Fig. 6.
"
"
4. In reheating Furnaces, the combination of the Helix' screw feeder, with
inclined bars, and intermediate tilting bars substantially as described and as
illustrated in Fig. 7.