Improvements in or relating to Mechanical Stokers and other Parts connected therewith.
Year: 1890

page_text: Date of Application, 5th Nov., 1890
Complete Specification Left, 10th July, 1891-Accepted, 15th Aug., 1891
PROVISIONAL SPECIFICATION.
.Improvements in or relating to Mechanical Stokers and other
Parts connected therewith.
I, JAMES HODGKINSON of the firm of Hodgkinson and Company Limited, of
Woden Street, Ordsall Lane, Manchester in the County of Lancaster, Engineer,
do hereby declare the nature of my said invention to be as follows:-
This invention refers to improvements in or relating to mechanical stokers
and other parts connected therewith and has for its object that of, constructing
several parts of what are known as coking stokers in such a manner as to
considerably prolong the life of the same, and prevent as far as, possible the
burning of the coking-boxes, coking-plates, hopper slides, and other parts exposed
to the action of fire. This I effect by constructing the said parts, with or without
a framework of iron and pockets, of refractory material or materials, the same
being held in position by any suitable means.
To prevent the back-bearer or dead-plate of the fire-bars burning away too
readily as hitherto I construct the same in the form of a shell or vessel fitted to the
flue, and charge the same with water or liquid direct from the boiler front or other
sources by means of taps and pipes; the latter being so arranged as to ensure of
perfect circulation, without destroying or weakening the boiler flue by drilling as
hitherto, thus avoiding the evil results of expansion and contraction experienced in
circulating water-bridges or bearers.
Another modification of this invention refers to a novel method of operating the
driving shaft of coking stokers and bars applied to marine boilers with flues
of varying heights, and consists in providing the said shafts with worm wheels
driven by an intervening worm, mounted on a shaft coupled direct to the engine or
otherwise.
Dated the 2nd Naramban 1000
COMPLETE SPECIFICATION.
...Improvements in or relating to Mechanical Stokers and other
Parts connected therewith.
I, JAMES HODGKINSON of the firm of Hodgkinson and Company Limited, of
Woden Street, Ordsall Lane, Manchester in the County of Lancaster, Engineer,
do hereby declare the nature of my said 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 refers to improvements in or relating to mechanical stokers
and other parts connected therewith and has for its object that of constructing
several parts of what are known as coking stokers in such a manner as to
considerably prolong the life of the same, and prevent as far as possible the.
burning of the coking-boxes, coking-plates, hopper slides, and other parts exposed
to the action of fire. This I effect by constructing the said parts, with or without
a framework of iron and pockets, of refractory material or materials, the same
being held in position by any suitable means.
To prevent the back-bearer or dead-plate of the fire-bars burning away too
readily as hitherto I construct the same in the form of a shell or vessel fitted to the
יר

page_text: Alue, and charge the same with water or liquid direct from the boiler front or other
sources by means of taps and pipes; the latter being so arranged as to ensure of
perfect circulation, without destroying or weakening the boiler flue by drilling as
hitherto, thus avoiding the evil results of expansion and contraction experienced in
circulating water-bridges or bearers.
Another modification of this invention refers to a novel method of operating the
driving shaft of coking stokers and bars applied to marine boilers with flues of
varying heights, and consists in providing the said shafts with worm wheels
driven by an intervening worm, mounted on a shaft coupled direct to the engine or
otherwise.
Fig. 1 is a sectional elevation of dead-plate constructed with pockets to receive
refractory material or materials, to prevent the burning of same and prolong its life.
Fig. 2 is a plan of same. Fig. 3 is a sectional elevation of coking-boxes provided
with pockets to receive refractory material or materials, and Fig. 4 is an outside
longitudinal view of Fig. 3.
A is the dead-plate and B the coking boxes provided with the taper pockets C,
which are filled with fire-clay, asbestos, or other refractory materials or compounds
to prevent the burning away of the same. The pockets Care made taper
as shown so as to hold the refractory materials in place. Holes D may be
provided in the dead-plate A to admit of atmospheric air passing through to
aid combustion.
Fig. 5 is a part sectional elevation of a boiler and flue showing my improved
back-bearer or dead-plate, and Fig. 6 is a front view of boiler and pipe connections
to back-bearer or dead-plate.
E is the back-bearer or dead-plate fitted to the flue G in any convenient manner,
and is designed to carry the back end of the fire-bars H. The back-bearer or
dead-plate E is charged with water to prevent the same burning away as hitherto.
Water is conveyed from the boiler front to the back-bearer or dead-plate E by the
pipes I, and from the same by the pipes K back to the boiler, as indicated by the
arrows, by which a perfect circulation will be maintained without destroying or
weakening the boiler flue G by drilling as heretofore, thus avoiding the evil results
of expansion and contraction experienced in circulating water-bridges or bearers.
The pipes I and K are fitted with the valves or taps L to regulate the water
supply to the back-bearer or dead-plate E.
Fig. 7 is a sectional elevation of another modification of back-bearer or dead-
plate composed of pipes, and Fig. 8 is a plan of same.
The pipes E forming the back-bearer or dead-plate are placed side by side, and
jointed together at the ends as shown, being coupled to the pipes I and K, through
which water circulates as indicated by the arrows.
Fig. 9 is a part front elevation of a marine boiler with flues of varying
heights fitted with my improved coking stoker and bars, and Fig. 10 is a side
elevation of driving gear.
The driving shafts M of my improved coking stokers and bars are provided with
the worm wheels N, both of which are driven by the intervening worm O mounted
on the shaft coupled direct to the engine or otherwise. In case it is desired to
reduce the speed of the shaft P it can be effected by means of the worm wheel T
and the worm S; the latter being mounted on the shaft V coupled direct to the
engine or otherwise. The shafts M and P are supported in the bearings R on the
fixings W secured to the bunker side or other place.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is-
1. The combination of the dead-plate A with the taper pockets C to retain
refractory material, with, or without, the holes D to admit atmospheric air
through the said non-conducting material to aid combustion, substantially as
described.

page_text: 2. The combination of the coking-boxes B with the taper pockets C to retain
refractory materials for the purpose specified, substantially as described.
3. In combination with a steam boiler the employment of the hollow back-bearer
or dead-plate E or its equivalent consisting of the pipes E, and the means for
effecting circulation of water through the same to and from the boiler for the
purpose specified, substantially as described.
4. In combination with the driving shafts M the employment of the worm
wheels N and the intervening worm O to drive the said shafts direct from the
engine or other shaft, substantially as described.
Dated the 6th July 1891
EDMUND CHADWICK,
Agent.