IMPROVEMENTS IN FURNACE GRATES
Year: 1884

page_text: COMPLETE SPECIFICATION.
I BENJAMIN JOSEPH BARNARD MILLS of the firm of Harris and Mills of
23 Southampton Buildings in the County of Middlesex, Patent Agent do hereby
declare the nature of the said Invention for IMPROVEMENTS IN FURNACE GRATES
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, that is to say :-
The Invention relates to certain improvements in furnace grates.
The object of the Invention is to improve the general construction of the grate
and to provide improved means for shaking and dumping the same.
To the accomplishment of the above the Invention consists of the novel devices
and combination of devices as will be described and claimed. Reference will be
made to the accompanying Drawings in which Figure 1, is a sectional view through
the grate, showing one method of operating the same; Figure 2, a plan view
thereof; Figure 3, a second section of the grate; Figure 4 a side elevation showing
a modified arrangement for shaking the grate; Figure 5 a detail of the same parts;
and Figures 6, 7, 8 and 9 views in detail of different parts. Like letters refer to
like parts in each view.
The grate is composed of a series (two or more) of shaking sections A, A¹, A², A³ a
stationary end section B, and a shaking end section C; or both end sections may
be fixed. The intermediate shaking sections A, A1, A2, A3, consist each of a series
of plates a arranged parallel at equal distances apart and removably secured to a
longitudinal bar b as will be described, while to bar 6 of each end section B,
plates care secured, said plates being provided with projections & which enter
notches in the front and rear rails e. Each bar bis provided on its ends with
trunnions which rest in suitable notches or bearings formed in side bars D, the
bar b of the stationary end section B, being provided with square ends which rest
in square sockets of the side bars D to hold such section in a fixed position. As
before mentioned, the plates a c are removably secured to bars 6 and in the
following manner: Each plate is provided with a downwardly projecting portion g
(or two or more plates may be cast together) and is cored out as is clearly shown
in Figure 9, and as shown in that Figure is fitted over the bar baud held in place
by a pin which passes through the part g at a point immediately below said

page_text: bar b. By having these plates thus removably secured to bars, I am enabled where
one is broken or burnt away, to replace it with a new one without the trouble or
expense of removing and renewing the entire bar.
The plates a of each section are relatively spaced to alternate and interlap the
plates of the next adjacent section, and that the plates of ono section will extend
centrally into the interstices between the plates of such adjacent section and will
reach to near the axial line of the same, in such a manner that the ends of plates
of alternate sections will nearly meet and apparently will form continuous grate
bars.
In the arrangement shown in Figures 1, 2 and 3 instead of having each bar b
provided with trunnions which rest in notches in the side bars D, the ends of said
bars bare inserted into sockets e' provided with trunnions which rest in said notches.
Such of said sockets e¹ as are situated upon one side of the furnace are cast with
toothed segments k so arranged that the segments of alternate sockets will be in
the same line, the teeth of segments of sockets in which sections A, A', arc
supported meshing with teeth formed on the upper face of a rack while those of
sections A', A, mesh with teeth similarly formed on a rack m.
These racks and m are each mounted on rollers n which are secured to a
suitable pivot bar mounted in a bracket o and said racks protrude out a certain
distance through the front wall of the furnace.
By reference to Figure 2 it will be seen that the tooth described as formed in the
upper face of racks lm extend only a portion of the length of said racks and
further, that from the point where these teeth stop, to the outer end of the racks,
they have teeth formed on their inner faces said teeth being opposite each other.
A vertical shaft E, has its boaring in suitable brackets p secured to the front wall,
and is provided with a hand wheel F, and at its lower end with a pinion q said
pinion meshing with the teeth described as formed on the inner faces of racks l, m.
By this arrangement it will be seen that by turning the hand wheel F, motion is
imparted to the racks and grate sections, and as the segments of the grate sections
are arranged alternately with respect to racks 1 m and as such racks inove in
opposite directions, the plates a of adjacent sections will be moved in opposite
directions, and further it will be understood that by turning the hand wheel
sufficiently, the plates can be brought to a vertical position to dump the fuel.
In Figures 4 and 5 I have shown another arrangement for shaking and dumping
the grate. As shown in these Figures, upon the lower face of one end of each
bar there is formed a section 7, to each of which is secured a bent and inclined
arm G, now to be described.
The arms of alternate sections are attached respectively at the inner or outer end
of sections 7 each arun being provided at its lower end with a slot s.
Two arms H, H', provided with pins are connected to the depending bent
arms G, by passing said pins through the slots formed in the lower end of said bent
arms, these pins being held in place by pins u passed transversely through said
slots.
The arms H, H³, are attached in the manner described to alternate arms G, that
is to say, arm H is secured to the arms of sections A, A', and arm H¹ to
sectious A', A. At their front ends the arms H, H, are passed through an
opening made in the front wall of the furnace, the arm H, being bent downward
while the arın H¹ is bent upward. The arms are secured to opposite ends of an
arm I, which is pivotted at its centre in a bracket K, secured to the front wall and
is operated by a lever S.
Having thus described the nature of the said Invention and the mode in which
the same may be carried into effect, I would have it understood that what
I claim is
First: The plates a provided with downwardly projecting lugs g and adapted to
fit over bars bin combination with said bars, means for holding them in position,
and means for shaking said bars and plates as described.

page_text: Second: The combination with bars b. carrying plates a of the bent, inclined and
slotted arms G, and suitable means for operating the parts as described.
Dated this 27th day of May 1881
B. J. B. MILLS.
By Harris & Mills,
23, Southampton Buildings,
Agents.