Year: 1899

page_text: I, WILFRED ROTHERY WOOD, of 18, Walbrook, in the City of London, Engineer,
do hereby declare the nature of this invention to be as follows:-
The present invention relates to detail improvements in mechanical stoking
apparatus particularly of that class described in Specification 17179 of 1898 and
to the modified form of such apparatus in which that portion of the feed screw
located beneath the combustion chamber in the magazine is in the form of a helix
or spiral without a central core or stem and the upward feed from the magazine
is only open from a point approximately on a horizontal plane with the axis of
the screw on that side upon which the thread rises to a point at or slightly past
that which would be formed by a plane drawn vertically through the axis.
The present invention enables such stokers to be more easily and efficaciously
applied to what are known as Lancashire boilers and the nature of the improve-
ments will now be described.
The grate is formed of overlapping bars which may advantageously be made
of substantially angle bar cross section the bars being bolted or secured together
so as to form a longitudinally stepped grate upon either side of the magazine,
draught spaces being left between the edges of the overlapping bars and the
outer ones which may be almost of U section carrying the bottom plate forming
the air jacket which passes beneath the magazine. The inner end of the maga-
zine and air jacket carry projecting lugs or clips adapted to engage with and
support a bracket carrying a removable fire bridge while the outer end of the
magazine carries the face plate adapted to close the flue opening, and the feed
hopper and feed screw operating mechanism. The hopper is mounted on the
outer end of the magazine as on a trunnion and can be swung down so as to leave
the face plate clear at any moment when it is desired to resort to hand firing or
to have the face plate clear.
The feed screw is provided at its outer end with a ratchet wheel operated by
a lever loosely mounted on the shaft and carrying above its pivot point a pivotted
dog which can be swung over upon either side so as to feed or reverse the screw
without varying the motion imparted to the lever by the motor. To prevent
any unintentional back movement of the wheel a ratchet or pawl is adjustably
mounted in a frame upon the casing and to prevent undue pressure on said
casing the outer edges of the frame embrace projecting edges or enter grooves
formed upon the ratchet wheel. The lower end of the feed actuating lever is
provided with gear teeth which engage with corresponding gear upon a sleeve
or framing surrounding the motor cylinder and connected to the piston rod thereof
by means of a crosshead.
1000

page_text: ical Stokers.
I, WILFRED ROTHERY WOOD, formerly of 18, but now of 31, Walbrook, in the
City of London, 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:-
The present invention relates to detail improvements in mechanical stoking
apparatus particularly of that class described in Specification 17179 of 1898 and
to the modified form of such apparatus in which that portion of the feed screw
located beneath the combustion chamber in the magazine is in the form of a helix
or spiral without a central core or stem and the upward feed from the magazine
is only open from a point approximately on a horizontal plane with the axis of
the screw on that side upon which the thread rises to a point at or slightly past
that which would be formed by a plane drawn vertically through the axis
as is more fully described in Specification 19532 of 1899.
The present invention enables such stokers to be more easily and efficaciously
applied to what are known as Lancashire boilers and the nature of the improve-
ments will now be described.
In the accompanying drawings Fig. 1 is a side sectional elevation, Fig. 2 a
view of the grate with one of the sections removed. Fig. 3 is an end elevation
showing the feed operating mechanism and Fig. 4 a cross section of the grate.
The grate is formed of overlapping bars 1 which may advantageously be made
of substantially angle bar cross section the bars having suitable distance pieces
and being bolted or secured together by bars or bolts 2 so as to form a longi-
tudinally stepped grate upon either side of the magazine 3 below which is the
feed screw 4 draught spaces being left between the edges of the overlapping bars
and the outer ones which may be almost of U section carrying the bottom plate 5
forming the air jacket which passes beneath the magazine. The innermost bars 1
may be attached to the screw casing by curved ears 6 resting in a curved recess 7
which will form a hinge preventing the set of bars from rising when the fuel
is forced up and also enabling any set of bars to be turned up and readily
removed as desired. The inner end of the magazine and air jacket carry project-
ing lugs or clips 8 adapted to engage with and support a bracket 9 carrying a
removable fire bridge 10 while the outer end of the magazine carries the face
plate 11 adapted to close the flue 12, and the feed hopper 13 and feed screw
operating mechanism. The hopper 13 is mounted on the outer end of the maga-
zine as on a trunnion and can be swung down as shown in Figs. 1 and 3 so as
to leave the face plate 11 clear at any moment when it is desired to resort to
hand firing by opening the door 14 or to have the face plate clear for other
purposes.
The feed screw is provided at its outer end with a ratchet wheel 15 operated
by a lever 16 loosely mounted on the shaft of the screw 4 and carrying above its
pivot point a pivoted dog 17 which can be swung over upon either side so as to
feed or reverse the screw without varying the motion imparted to the lever 16
by the motor. To prevent any unintentional back movement of the wheel a
ratchet or pawl 18 is adjustably mounted in a frame 19 upon the casing and to
prevent undue pressure on said casing the outer edges of the frame 19 embrace
projecting edges or enter grooves formed upon the ratchet wheel 15. The lower
end of the feed actuating lever 16 is provided with gear teeth 20 which engage
with corresponding gear 21 upon a sleeve or framing 22 surrounding the motor
cylinder 23 and connected to the piston rod thereof by means of a crosshead 24.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In mechanical stokers and in combination a grate formed of a series of fire
bars of substantially angle bar cross section, a bar or bolt holding said fire bars
in operative position so that the outer end of each bar overlaps the inner end
of the succeeding bar substantially as described.
2. In mechanical stokers and in combination a grate formed of a series of fire-
bars of substantially angle bar cross section, a bar or bolt holding said fire bars
in operative position so that the outer end of each bar overlaps the inner end
of the succeeding bar and an air jacket attached to the outer bars and extending
beneath the screw casing substantially as described.
3. In mechanical stokers and in combination a fuel feed casing, a feed hopper
mounted thereon as on trunnions and capable of being swung or turned down so
as to leave the face plate clear substantially as described.
4. In mechanical stokers and in combination a feed screw carrying a ratchet
wheel, a lever loosely mounted on the screw shaft and carrying a pivoted dog
adapted to engage with the ratchet wheel, gear carried by said lever and adapted
to engage with gear upon a sleeve or framing surrounding the motor cylinder
and means for imparting motion to such sleeve or frame from the motor sub-
stantially as described.
5. The improved mechanical stoker arranged and constructed substantially as
described.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicant.