Improvements in and connected with the Stoking of Furnaces.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with the Stoking of Furnaces.
We, LOUIS WILLIAM GARNETT FLYNT of 7 Walmer Road, Birkdale in the County of
Lancaster, and ALFRED COTTON of 10 Park Road, Port Sunlight in the County o
Chester Engineer and Draughtsman respectively do hereby declare the nature of this
invention to be as follows:-
The first part of our invention has reference to the fire bars. We arrange them in
such manner that every alternate bar is stationary while the remainder are movable.
The two end bars have extended portions which project out through the furnace front.
They are connected inside by a tubular or other stay which serves to support the ends
of all the other movable bars and causes any motion imparted to the two end bars to
synchronously affect all. The projecting ends of the two bars are connected with an
eccentric or other motion which gives them an up and down movement, and we
provide a pair of links, or slotted guides, or other device to cause the bars to reciprocate
longitudinally during a portion of their rise and fall. The inner ends of the bars rest
upon a bearer. This may be held in place by means of stays from the frout and will
merely rest on the walls of the flue, instead of being bracketted thereto ns is frequently
done. When the fuel is fed automatically we prefer, instead of employing feed rollers
or other mechanical devices to allow it to fall down the feed hopper by its own weight.
The shape of the bottom of the hopper is such that the fuel rests thereon until it is
disturbed. We provide a steam jet or jets in proximity to the hopper bottom which
serves to disturb the fuel and feed it to the furnace, the column in the hopper
descending as fast as the lower layer is removed.
This form of feed we may employ in conjunction with our stoker as described in our
Complete Specification No. 1890195
COMPLETE SPECIFICATION.
Improvements in and connected with the Stoking of Furnaces.
We, LOUIS WILLIAMS GARNETT FLYNT, of 7 Walmer Road, Birkdale, in the County
of Lancaster, and ALFRED COTTON, formerly of 10 Park Road, now of 3 Bridge Street,
Port Sunlight, in the County of Chester, Engineer and Draughtsman, respectively, 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:-
The first part of our invention has reference to the fire bars. We arrange them

page_text: in such manner that every alternate bar is stationary, while the remainder are
morable.
Referring to the drawings,
Fig. 1 is a longitudinal section through a boiler furnace constructed according
to our invention, and showing one of the movable bars G, as hereinafter
described.
Fig. 2 is an elevation of one of the intermediate movable bars.
Fig. 3 is a similar view to Fig. 2, showing a fixed bar.
Fig. 4 is a diagram indicating the path traversed by the front end of the
movable bars.
Fig. 5 is a section through the hopper of a mechanical stoker attached to a
furnace front, and embodying our improvements as hereinafter described.
Fig. 6 is a section on line a-b of Fig. 6.
Like letters indicate corresponding parts in all the figs.
A is the furnace front and B is the flue. Towards the rear end of flue B is a
bearer C, which serves to support all the bars. This bearer simply rests on the
flue wall at each side and is not fastened thereto. Its vertical position is main-
tained by stays c, whose front ends are attached, as shown, to the flue bracket D
at each side. Bearer C does not reach quite to the bottom of the flue and the
space beneath is used for the withdrawal of ashes etc. Bearer C is also hollowed
out centrally as shown at c and a brick bridge (not shown), is built in the flue
a short distance behind bearer C. The flue brackets carry a cross bearer E, and
on this the front ends of the fixed bars Frest.
We will now describe the movable bars G. The two end or outside movable
hars G (Fig. 1) have extended portions G which project out through the furnace
front. They are connected together inside the furnace by a tubular stay H, and upon
said stay all the other movable bars rest at their front ends. The projecting
portions G of the end bars are hung upon a pair of eccentric rods G (or it inay be in
some cases to rods connected to cranks or other reciprocating parts) to that it will be
seen that when the shaft on which the eccentrics are mounted is turned, the two end
bars will rise and fall, and will carry with them all the intermediate movable bars G.
To give the bars a longitudinal to nud fro motion in addition to their rise and fall,
we employ a pair of links I pivotted at i to the flue bracket D at each side of the
furnace, said links I loosely embracing the tubular stay H, by means of a perforn-
tion . In Fig. 1 the bars are shown in their lowest position. Starting from there
on the extensions G₁ being lifted, all the movable bars G will participate in the lift
vertically, until the stay I tightens in, or against the end of, the holes in links I,
and the lift. being continued, said links will oscillate on their pivots i, and will thus
cause the bars G to travel backwards. (See Numbers 2 and 3, in Fig. 4) During this
backward travel of the bars, their back ends slide over the top of bearer C. On
the highest point of the eccentrics' travel being passed, the hara again drop until tho
tubular stay I tightens against the other end (nearest its pivot) of the bole in the
link I, and the bars are then carried towards the front again. The diagram Fig. 4
clearly shows on an enlarged scale the track of the front ends of the movable
bars.
To make the action clearly understood, we wish to point out that if the hole in
link I were a true fit on stay H, instead of being alnck, the path of the bare must
have followed the lines 2-3 in Fig. 4, that is, an arc of a circle whose radius is the
distance between the contres of hole i' and pivot i. By being constructed as described,
the circumferential guiding of link 1 is idle during the passage of stay H across the
hole each time the up and down motion is reversed, and the movement of the bars
is thus practically vertical for that distance. It will be noticed that bars G first rise
and go backwards, and then fall and travel forwards, the fact of their being above the
level of the fixed bars when going backwards, and below them when coming towards
the furnace front, causing & very efficient travel of the fuel. When our invention is
used with automatic feeding of fuel to the furnace, for instance in combination with

page_text: our stoker, as described in our Complete Specification No. 18901 of 1895, we prefer
that the eccentrics shall be mounted on the fuel feed roller shaft.
Referring now to Fig. 5. The second part of our invention relates to feeding devices
such as are employed with mechanical stokers to effect aud regulate the supply
of fuel, and is particularly adapted for use in combination with our stoker above
referred to, viz. No. 18901 of 1895. J shows the feed hopper which is kept supplied
with fuel, the pile thereof resting on the bottom of the hopper until disturbed. The
"angle of repose " is approximately indicated by the dotted line j. K is our divergent
steam jet for projecting the fuel into the furnace. For the purpose of disturbing the
fuel and thereby causing the bottom increment to fall into the furnace (or jet box),
we provide a second jet L which by impinging on the pile will effect the desired
result. A flap M swinging on trunnions N, serves to control the fall of the fuel, and
to spread and regulate the issuing jet, being kept in place up against the pile by
weight O. The steam impinges on the flap and is deflected and spread thereby onto
the fuel.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is,
1. The movable fire bars & the two outer ones of which have extended portions G¹
connected by a stay such as H, upon which the front ends of the remainder of the
movable bars rest, in such manner that notion imparted to the said end bars will
synchronously affect all, substantially as described.
2. In a furnace, movable bars alternating with stationary bars, and resting upon a
stay H, by means of which motion from eccentrics or their equivalents, imparted to
the two end bars G by means of extensions G1 causes the whole series of movable bars
to move in concert, substantially as shown.
3. A series of movable bars, alternating with a series of fixed bars, the former series
having a curved backward and forward motion imparted at their front ends, and a
vertical rise and fall at the commencement of said backward and forward motion
respectively substantially as described.
4. The links J, which convert a portion of the rising and falling motion into a
reciprocating to and fro motion, substantially as described and shown."
5. In a mechanical stoker, the method of supplying fuel to the furnace, which
consists allowing it to fall and to rest upon the hopper bottom, until disturbed, and
in causing a jet of steam to disturb the lowest layer, so as to cause it to pass into the
furnace (or jet box) substantially as described and shown, in Figs. 5 and 6.
6. The combination of the various parts as illustrated in Figs. 5 and 6, with the
object of causing the fuel to feed into the furnace (or jet box) without mechanical
propulsion, substantially as described and shown.
7. Its a stoker, a device for supplying fuel, which retains said fuel in a state of rest
in proximity to the furnace, in combination with a steam jet for causing the lowest
increment of the pile of fuel to be disturbed, and to enter said furnace (or jet box)
substantially as described and shown.
8. The improvements in and connected with the stoking of furnaces taken as a
whole, substantially as described and shown in the drawings.
LOOM
CHARLES COVENTRY,
Patent Expert, Applicants' Agent.