Year: 1899

page_text: Date of Application, 12th June, 1899
Complete Specification Left, 10th Mar., 1900-Accepted, 12th July, 1900
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; -
-
It has heretofore been proposed to use rising and falling and also reciprocating
grate bars in furnaces of various forms, the objects being to keep the fuel from
caking or massing together to too great an extent, and also to keep the draught
ways clear. Hollow bars through which air is injected and stepped bars have
also been proposed.
The present invention relates to what may be called a hollow bar stepped
furnace and consists in so forming and mounting the bars that when in their
normal position there is free access for the natural or forced draught through
the bars and fuel and no tendency of the fuel to pass between the bars to the
ashpit, the bars being kept cool by the air passing through them and the amount
of draught inlet being capable of regulation by varying the position of the
bars which may be rocked until at the extreme limit of their working position
the draught is entirely cut off and an even dead plate furnace bottom produced,
the bars in reaching this position having a cutting or shearing action on any
fuel or material lying in or adjacent to the draught inlets which are thereby
kept clear which is a point that has hitherto been difficult to secure when using
certain classes of fuel.
Further rocking movement may be imparted to the bars so as to form dis-
charge openings between them and secure the dumping of any desired quantity
of ashes to the ashpit.
1011
1
T
1000
PHILIP M. JUSTICE,
55 and 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicant.
I, WILFRED ROTHERY WOOD, of 18, 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:―
It has heretofore been proposed to use rising and falling and also reciprocating
grate bars in furnaces of various forms, the objects being to keep the fuel from

page_text: caking or massing together to too great an extent, and also to keep the draught
Hollow bars through which air is injected and stepped bars have
ways clear.
also been proposed.
The present invention relates to what may be called a hollow bar stepped
furnace and consists in so forming and mounting the bars that when in their
normal position there is free access for the natural or forced draught through
the bars and fuel and no tendency of the fuel to pass between the bars to the
ashpit, the bars being kept cool by the air passing through them and the amount
of draught inlet being capable of regulation by varying the position of the
bars which may be rocked until at the extreme limit of their working position
the draught is entirely cut off and an even dead plate furnace bottom produced,
the bars in reaching this position having a cutting or shearing action on any
fuel or material lying in or adjacent to the draught inlets which are thereby
kept clear which is a point that has hitherto been difficult to secure when using
certain classes of fuel. Further movement may be imparted to the bars so as
to form discharge openings between them and secure the dumping of any
desired quantity of ashes to the ashpit.
In order that the invention may be clearly understood reference is made to
the accompanying drawings in which Fig. 1 represents a side view of a furnace
composed of a series of the improved bars, the side of the furnace being
removed. Fig. 2 is a perspective view upon a larger scale of one of the grate
bars. Fig. 3 is a sectional view through a number of the bars when in position
for fuel draught. Fig. 4 is a like view when the draught is entirely cut off and
a dead plate furnace is produced and Fig. 5 a similar view when the bars are
in position for discharging the ashes into the ashpit.
In the drawings the bars A have a substantially box like cross section the
top and bottom being when necessary supported and held by connecting ribs B.
Each bar is supplied with trunnions or supports (which find bearings not
shown in the walls of the furnace or wind box D). The downwardly projecting
leg E of the bar is provided with a pin F or other device adapted to engage
with the bar G so that all the bars may be operated in unison.
When the bars are in the position indicated in Fig. 3 full draught will pass
from wind box 1) to and through the bars as indicated by arrows and to reduce
such draught it will be only necessary to slightly move the bars until the rear
upper solid portion of each bar partially closes the opening in the next adjacent
bar as indicated by dotted lines in Fig. while further movement completely
cuts off the draught and at the same time effectually cuts or shears off any
fuel or gummy matters adhering at the outlets of the draught openings. When
the bars are in this position as indicated in Fig. 4 a dead plate is produced
which can be readily raked or scraped to loosen any adhering fuel and the ashes
may be discharged by further movement of the bars into the position indi-
cated in Fig. and it is only when such bars are in this position that there is
any tendency of the fuel or ashes to pass through them.
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 combustion furnaces grate bars having substantially box like cross see-
tions the space within the bars forming the draught inlet to the furnace and the
top of such bars forming the furnace bottom and the lower part of such bars in
combination with the top of the next adjacent bar forming a stop plate extend-
ing rearward from the draught opening to prevent the fuel passing between
said bars when in working position substantially as described.
2. In combustion furnaces grate bars having substantially a box like cross
section the space within the bars forming the draught inlet to the furnace and
means for moving such bars so as to cause the rear top section of one bar to
move across the draught opening between the top and bottom section of the

page_text: next adjacent bar to partially or entirely close the draught substantially as
described.
3. In combination furnaces, grate bars having substantially a box like cross
section and through which the draught passes, and means for moving such bars
and causing the rear top face of one bar to cut or shear across the draught out-
let of the next adjacent bar substantially as described.
4. In combustion furnaces grate bars having substantially a box like cross
section and through which the draught passes the top of such bars forming the
furnace bottom and the lower part of such bars in combination with the top of
the next adjacent bar forming a stop plate to prevent fuel passing between
such bars when in working position and means for moving such bars to form a
dead plate substantially as described.
5. In combustion furnaces grate bars having substantially a box like cross
section and through which the draught passes the top of such bars forming the
furnace bottom and the lower part of such bars in combination with the top of
the next adjacent bar forming a stop plate to prevent fuel passing between such
bars when in working position and means for moving such bars to form a dead
plate and finally to open the spaces between the bars for discharge of fuel or
ashes, substantially as described.
Dated this 10th day of March 1900
PHILIP M. JUSTICE,
55 and 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicant.