Improvements in Mechanical Stokers and Fire Bars for Boller Furnaces.
Year: 1894

page_text: Date of Application, 3rd Mar., 1894
Complete Specification Left, 20th Nov., 1894-Accepted, 22nd Dec., 1894
PROVISIONAL DE BOITICATION.
Improvements in Mechanical Stokers and Fire Bars for Boller
Furnaces.
I, ALFRED THOMAS CASS, of Hope Foundry, Bolton, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to that class of mechanical stokers known as coking
stokers and is designed to facilitate the removal of parts to allow of the repair or
renewal of the arch placed in front of the furnace behind the hopper and of the
fire bars in the furnace.
As hitherto constructed the top plate which covers the arch has been cast in
one piece with the front plate and has been secured in position by bolts passed
through flanges and in order to remove these to repair the arch it has been necessary
to remove the back from the hopper and the fire bars have been made in one
length requiring the removal and renewal of the whole bar wheu burnt or worn
down at one end.
This invention consists in constructing these two plates separately dispensing
with the flanges and securing the top in position by means of an arched or curved
cross bar the ends of which are held in brackets and by which the plate is held
down by a screw, wedge or the like and in securing the front plate which is
wedge shaped by set screws, and in forming the fire bars in two lengths with a
support at the centre so that one part can be removed and a rising and falling
movement be given to the bars at the centre of the furnace.
In carrying out the invention I construct the hopper and operative parts of
the stoker and build in the arch of fire bricks as heretofore.
Over the top of the brick arch I place a curved plate and on the side plates
I form brackets or lugs to receive the ends of a curved bar. Above the top plate
I mount a curved or arched bar the ends of which are preferably bent up and
engage with the brackets or lugs on the side plates. Through the centre of the
bar is passed a screw the point of which bears against the top of the plate, a
socket being formed thereon to receive it. Or instead of the screw, (which I at
present prefer) wedges, blocks or the like may be inserted between the two to
hold the plate firmly in position. The front plate is secured in position by two
or more set screws or bolts passing through it.
The fire bars I make in two lengths coupled together by a ball and socket or
other convenient form of joint to allow of a movement between the two parts.
Attached to one or both parts of the bar where they come together on the under
side. I place a curved or slanting piece or projection. Across the furnace I place
a shaft with wharves or runners upon which the projecting part of the bar rests
so that as the bar is moved to and fro longitudinally to move the fuel along it is
also given an up and down movement which tends to break the surface of the fire
the joint in the bar allowing it to move in the centre without raising the ends.
To remove the front parts the screws or bolts are first taken out of the front
plate which then can be easily detached, the screw in the arched bar can then be
unfastened, and the top plate, when released, can be drawn forward so that the
arch can be got at to be repaired or rebuilt. The bars can be removed one at a

page_text: time one part detached from the other and a new part substituted and the whole
then replaced.
Dated this lot day of March 1901
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
-
Improvements in Mechanical Stokers and Fire Bars for Boiler
Furnaces..
I, ALFRED THOMAS CASS, of Hope Foundry, Bolton, in the County of
Lancaster, 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 relates to that class of mechanical stokers known as Cass's
coking stokers and is designed to facilitate the removal of parts to allow of the
repair or renewal of the arch placed in front of the furnace behind the hopper and
of the fire bars in the furnace.
As hitherto constructed the top plate which covers the arch has been cast in
one piece with the front plate and has been secured in position by bolts passed
through flanges and in order to remove these to repair the arch it has been
necessary to remove the back from the hopper and the fire bars have been made
in one length requiring the removal and renewal of the whole bar when burnt or
worn down at one end.
This invention consists in constructing these two plates separately dispensing
with the flanges and securing the top in position by means of an arched or curved
cross bar the ends of which are held in brackets and by which the plate is held
down by a screw, wedge or the like and in securing the front plate which is wedge
shaped by set screws, and in forming the fire bars in two lengths with a support
at the centre so that one part can be removed and a rising and falling movement
be given to the bars at the centre of the furnace.
The invention will be fully described with reference to the accompanying
drawings in which the invention is shown without the boiler accessories.
Fig. 1. Front elevation partly in section.
Fig. 2. Side elevation.
Figs. 3, 4 and 5. Enlarged details.
Fig. 6. Side elevation of fire bar.
Figs. 7, 8 and 9. Modifications of same.
In carrying out the invention I construct the hopper and operative parts of the
stoker and build in the arch A. of fire bricks or blocks as heretofore.
Referring to Figs. 1 to 5. Over the top of the brick arch A I place a curved
plate B and on the side plates C I form brackets or lugs D to receive the ends of
a curved bar E. Above the top plate B I mount a curved or arched bar E the
ends of which are preferably bent up and engage with the brackets or lugs D on
the side plates C. Through the centre of the bar E is passed a screw F the
point of which bears against the top of the top plate B, a socket 6 being formed
thereon to receive it. Or instead of the screw, (which I at present prefer) wedges,
blocks or the like may be inserted between the two to hold the plate firmly in
position. The front plate G is secured in position by two or more set screws g or
bolts passing through it.
Referring to Figs. 6-9. The fire bars I make in two lengths H and J coupled
together by a ball and socket or other convenient form of joint h to allow of a
movement between the two parts. On one or both parts of the bar where they are
joined together on the under side I form a curved or inclined piece or projection j.

page_text: Across the furnace I place a shaft or bearer K with rollers, wharves, tumblers or
the like k upon which the inclined piece ; of the bar rests so that as the bar is
moved to and fro longitudinally to move the fuel along it is also given an up and
down movement which tends to break the surface of the fire the joint h in the bar
allowing it to move in the centre without raising the ends.
To remove the front parts the screws or bolts g are first taken out of the front
plate G which then can be easily detached, the screw F in the arched bar E can
then be unfastened, and the top plate B, when released, can be drawn forward so that
the arch A can be got at to be repaired or rebuilt. The fire bars can be removed
one at a time the part H detached from the other part J and a new part substituted
and the whole then replaced.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A mechanical stoker of the class referred to constructed with the top plate
which covers the arch made separate from the front plate and held in position by
a curved bar and a screw or wedge the ends of the bar fitting under the lugs
attached to the side plates substantially as described.
2. In a mechanical stoker the combination with the fire brick arch A of the
front plate G held in position by screws or bolts the removable top plate B, the
curved bar E by which the top plate is held in position, the screw F, and the side
plates C provided with fixed brackets or lugs D by which the ends of the bar E
are held constructed and arranged substantially as described and shown.
3. A fire bar constructed in two lengths and connected together by a ball or
socket or other joint to allow of one part of the bar being replaced substantially
as described.
Dated this 19th day of November 1894.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.