Improvements in and appertaining to Fire Bars for Furnaces.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and appertaining to Fire Bars for Furnaces.
We, ALFRED COTTON, of 27, Bath Street, Port Sunlight, in the County of
Chester, and LOUIS WILLIAM GARNETT FLYNT, of 7, Walmer Road, Birkdale, in
the County of Lancaster, Engineers, do hereby declare the nature of this invention
to be as follows:-
Our invention relates to an improved construction and arrangement of "self
cleaning" firebars for furnaces, and in improved means for moving them, as
hereafter described, so that an efficient travel of the fuel and clinker shall result,
as well as an efficient breaking up thereof. The bars are arranged preferably
longitudinally, in the furnace, their back ends resting on a bearer, whilst their
forward ends rest on a cross bearer or rocker. The ends of the rocker are provided
with trunnions which are supported in suitable flue brackets attached at each side
of the furnace near to the furnace front. One portion of the rocker consists of a
transverse bar preferably of cast iron, which extends from near one side of the
furnace to the other, and is located just below the dead plate. It is in the form
of an inverted "T", that is to say it has an upright central rib whose lower edge is
spread out back and front to form a web or ledge at each side. The trunnions afore-
said are placed on each end about half way, more or less, between the top and
bottom of the central rib, and connecting links or levers are so arranged that a
to and fro motion may be imparted to the rocker about said trunnions. The
fire bars have depending lugs or tail pieces which rest on the web. They are
of two patterns, that is, about one half the bars rise and fall merely, (and are
termed lifting bars) whilst the alternate bars besides rising and falling, travel
to and fro a short distance. The depending tails of the lifting bars rest on the
web on the inner part of the rocker, so that when the latter is oscillated (by
hand or power, from without the furnace front,) the front ends of the lifting
bars are given a rising and falling motion. The moving bars rest with their
depending lugs on the outer part of the transverse web, and so are caused to rise
and fall together, alternately with the lifting bars. It will thus be seen that
while the moving bars are rising the lifting bars are falling, and vice versa.
The moving bars have also a slot beneath somewhat wider than, and meshing
with, the upright portion of the rocker which carries them backwards and forwards
with it. Sufficient clearance is left in said slots to allow a certain proportion of
idle motion of the top of said rocker, so that the moving bars rise or fall a little
before commencing their longitudinal travel.
Dated this 20th day of July 1898.
CHAS. COVENTRY,
Patent Expert,
Agent for the Applicants.

page_text: Improvements in and appertaining to Fire Bars for Furnaces.
We, ALFRED COTTON, late of 27, Bath Street, Port Sunlight, in the County of
Chester, but now of 15, Upper Hulton Street, Alexandra Park, Manchester, in
the County of Lancaster, and LOUIS WILLIAM GARNETT FLYNT, of 7, Walmer
Road, Birkdale, in the County of Lancaster, Engineers, 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:-
"self
Our invention relates to an improved construction and arrangement of
cleaning" firebars for furnaces, and in improved means for moving them, as
hereafter described, so that an efficient travel of the fuel and clinker shall result,
as well as an efficient breaking up thereof. The bars are arranged preferably
longitudinally in the furnace their back ends resting on a bearer as is usual in
moving firebars. The forward ends of the bars rest on a cross bearer.or rocker.
In the drawing Fig. 1 is a side elevation of the forward end of a lifting bar
constructed in accordance with our invention. Fig. 2 is a similar view of one of
our moving bars. Fig. 3 is a vertical section of the rocker above mentioned and
showing the bars resting thercon as they appear when the rocker is moving
towards the rear of the furnace. The rocker is shown in its midway position of
travel.
Fig. 4 is a similar view to Fig. 8 but showing the rocker in its most backward
position. Fig. 5 is an end elevation of the rocker showing it in its most forward
position, and showing also the trunnion upon which one end of said rocker is
supported, and oscillates.
We will first describe the rocker. It comprises a transverse bar A preferably
of cast iron which extends from near one side of the furnace to the other, and is
located just below the dead plate. Each end of the rocker is provided with a
trunnion B which is supported by, and free to oscillate in, a suitable flue bracket
attached to the side of the furnace. These flue brackets form no part of our
invention and are not shown in the drawings. The bar A is perforated at intervals
as shown at a to allow the escape of ash which might otherwise accumulate thereon.
The rocker also comprises a central upright rib C. The back ends of our fire-
bars are of usual construction. Half of our bars simply rise and fall and are
termed lifting bars. The front end of these bars is clearly shown in Fig. 1. Each
has a depending lug d which rests on the back edge of the transverse bar A and
rises and falls therewith. The slot d', in each lifting bar D, in which the rib C
is situated, is sufficiently wide to allow said rib to oscillate therein without
imparting longitudinal movement thereto. The oscillation of the rocker on its
trunnions is effected from outside the furnace front by any suitable means.
instance a lever may be attached to the rocker whereby motion may be directly
given thereto; or if preferred one or more of the firebars may be provided with
projecting lugs to which connecting rods may be coupled and by means of which
the rocker may be oscillated on its trunnions.
For
It will be seen that the lifting bars D have a simple rising and falling motion.
Fig. 4 shows them in their lowest position, and Fig. 5 in their highest.
Our moving bars E have each a depending luge which rests on the forward
portion of the transverse bar A. They rise and fall in the same way as the lifting 4
bars D but their point of support being at the reverse side of the centre of
oscillation, when the moving bars rise the lifting bars fall, and vice versa.
longitudinal travel of the moving bars E is effected by means of the rib C which
meshes with a slot el cast in each of said movable bars. The width of the slots e¹
The

page_text: is rather greater than the width of the top of the rib C so that in action there is
some idle motion of said rib. The effect of this arrangement is that the moving
bars rise or fall a little, before commencing their longitudinal travel.
A great advantage in our invention is that as both moving and lifting bars rise
and fall, instead of only the lifting bars as is usual hitherto, only about one half
the vertical movement of each bar is necessary to obtain the same difference in
levels as before. Another advantage over previous similar arrangements is, that
about one half the bars are supported on one side of the axis of oscillation and
the other half on the other side, thus practically equalising the balance of the
rocker, and rendering the power necessary to effect the back and the forward stroke
about equal.
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 devices such as described a transverse rocker having ledges before and
behind and an upright central portion, said rocker being pivotally supported
within the furnace, and a series of firebars having depending lugs which rest
alternately on said ledges respectively, substantially as described.
2. The improved lifting bar substantially as described and shown in Fig. 1.
3. The moving bar substantially as described and shown in Fig. 2.
4. The improvements in and appertaining to fire bars for furnaces, taken as a
whole, substantially as described.
Dated this 20th day of April 1899.
CHAS.
COVENTRY,
Patent Expert, Agent for the Applicants.