IMPROVEMENTS IN ROTARY SCREENS OR GRADING AND SIZING CYLINDERS
Year: 1885

page_text: We, EDWARD HARE, workman in the employ of Penney and Company, Limited,
of The Patent Screen Works, Lincoln, and CHARLES COUSINS, Manager to the said
Company and of the same place, do hereby declare the nature of said invention
for IMPROVEMENTS IN ROTARY SCREENS OR GRADING AND SIZING CYLINDERS, to
be as follows:-
Heretofore in certain constructions of rotary screens, the screen itself has been
supported and worked backwards and forwards on long rods running the full
length of the screen, the said rods being fastened to a ring or wheel secured fast
on the central shaft.
Now the object of this invention is to dispense with the ring or wheel, and to
reduce the length of the rods, say to one half, thereby economizing cost in the
manufacture of the screen while producing a screen which shall be more effective in
its work than hitherto.
According to our Invention we provide a number of tubes, which we arrange
upon the circumference of the screen in the direction of its length, the said tubes
extending a little more than half the length of the screen and being fixed at one of
their ends to one of the castings to which the wires of the screen are secured.
To the other casting-the one in which the wires terminate-we secure a number
of short rods corresponding to the number of tubes, the ends of these rods, when
the screen is fully expanded, just entering the orifices of the tubes.
On the screen being contracted the rods slide in the tubes, thereby answering the
same purposes of the long rods and the ring or wheel.

page_text: We, EDWARD HARE, Workman, in the employ of Penney and Company, Limited,
of the Patent Screen Works, Lincoln, and CHARLES COUSINS, Manager to the said
Company, and of the same place, 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, reference being had to the
accompanying drawings, and to the letters and figures marked thereon, that is
to say -
Heretofore in certain constructions of rotary screens or grading and sizing
cylinders the screen itself has been supported and worked backwards and forwards
on long rods running the full length of the screen, the said rods being fastened to a
ring or wheel secured on the central shaft.
Now the object of this invention is to dispense with the ring or wheel, and to
reduce the length of the rods, say to one half, thereby economizing cost in the
manufacture of the screen, while producing a screen which shall be more effective in
its work than hitherto.
We proceed with reference to the accompanying drawings to fully describe our
Invention.
Fig. 1, is a longitudinal section of a rotary screen, constructed according to our
Invention, and shewn in its expanded condition, the framework being removed for
sake of clearness.
Fig. 2 is a like view, but shewing the screen in its contracted or closed
condition.
Fig. 3, is a view of one of the ends of the rotary screen.
For the purpose of our Invention, we provide a suitable number of tubes a, which
we arrange upon the inner circumference of the screen, in the direction of its
length. These tubes extend a little more than half the length of the screen, as
shewn in figs. 1 and 2, and are fixed, at their outer ends, in lugs on the casting A,
to which casting one end of the wire forming the screen proper is secured. In
lugs on the opposite casting B-that to which the other end of the wire is secured-
we fix a number of rods b, corresponding to the number of tubes a, and length of
the rods. The ends of these rods b, when the screen is fully expanded, as seen in
fig. 1, just enter the orifices of the tubes. The tubes a, and rods b, are surrounded
or enclosed in the spiral springs c, which are secured along their length to the coils
of wire forming the screen proper, and at their ends to the castings A, and B;
but these spiral springs are of the usual construction.
Although we have described and shewn the rods and tubes arranged upon the
inner circumference of the screen, we do not confine ourselves to this arrangement,
as they may be equally well arranged upon the outer circumference of the same.
On the screen being contracted, by operating the handle Z, the rods b, slide
within the tubes a, and the casting A. is, at the same time, caused to slide along
the shaft X, thereby enabling us to dispense with the long rods and the ring or

page_text: wheel, while we produce a screen, or grading and sizing cylinder, which is more
effective in its work than those hitherto in use, Or if desired the tubes may be
arranged to slide over the rods.
Having now described our Invention, and in what manner the same is to be
performed, we declare that what we claim is:—
1. The improved construction of rotary screen, or grading and sizing cylinder,
as herein described and shewn in the drawings, whereby we dispense with the ring
or wheel, and the long rods, on which the screen was worked heretofore.
2. The employment and combination of the short rods and tubes arranged on
the inner or outer circumference of the rotary screen, or grading and sizing
cylinder, one end of said rods being secured to one of the castings, and one end of
said tubes being secured to the other of, said castings, the rods working within the
tubes, or the tubes over the rods, as and for the purposes described.