Improvements in the Construction of Screens for Coal, Coke, and the like.
Year: 1889

page_text: Date of Application, 7th Oct., 1889
Complete Specification Left, 7th July, 1890-Accepted, 9th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Screens for Coal, Coke, and
the like.
I, JOHN HAYNES of Silkstone Common near Barnsley County of York, Colliery
Proprietor, do hereby declare the nature of this invention to be as follows:-
This invention relates to the construction of mechanical or revolving screens for
separating the different sizes of coal, coke, and other like materials, in a rapid and
efficacious manner.
It consists broadly speaking of a series of tubular or cylindrical riddles or sieves
placed one inside the other with a space between each riddle; the centre riddle being
the coarsest mesh, and the outside one being the finest mesh, the material being fed
into the centre while the apparatus is revolving.
In carrying out the invention in the construction of a revolving screen for coal, for
example, I make it to consist of any desired number of cylindrical screens, three being
found a suitable number; these cylinders may be conical or bellmouthed, or they may
be parallel and inclined at such an angle as will cause the material (when the
cylinders are turned round) to travel down and be discharged from the lowest end
into shoots.
I prepare two end supports in the form of short lengths of cast iron pipes with a
broad flange at one end, and these flanged ends are facing each other at a suitable
distance apart.
To the internal face of these tubular supports I fix the ends of screen bars, until I
have formed a complete tubular screen, through which all but the largest coal will
pass.
I enclose this screen with one of finer mesh, say of woven wire, leaving a distance
of about six inches between the two; but this may be varied as desired. I support
this screen by means of bolts secured to the flanges of the end supports, and leave the
lower end open for the escape of coal.
I also enclose the last described screen with another of still finer mesh, and shorter
in length supported in a similar manner from the two flanges of the end supports, and
this is also left open at its lower end for the escape of coal.
I propose to support the apparatus at an angle or in an inclined position, upon a
series of antifriction rollers upon which it will be caused to revolve by any suitable
means either mechanical or by hand.
When coal is shot into the top end of the apparatus while it revolves, all except the
largest size passes through the bars of the first screen, into the second cylinder, the
large coal travels down and is discharged through the end support. The nuts and
small coal are separated in a similar manner, being discharged into shoots and carried
off to various places as desired.
When it is desired to shut off the action of any of the screens, for example the
outside or finest mesh, I propose to use a plain cylinder of sheet metal, and place it
either inside the one it is desired to close, or to fit it upon the outside of such screen
and thus prevent the passage of the coal.
Instead of the screens being supported upon the tubular ends plates or supports, with
a clear passage through them, they may be carried by a central shaft running in
bearings.
Dated the 4th due of October 1889

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Screens for Coal, Coke, and
the like.
I, JOHN HAYNES of Silkstone Common near Barnsley County of York, Colliery
Proprietor 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 :--
This invention relates to the construction of revolving screens for screening or
separating the different sizes of coal, coke, and other materials, in a rapid and
efficacious manner.
It consists broadly speaking of a series or number of tubular or cylindrical riddles
or sieves placed one inside the other, with a sufficient space between each; the centre
sieve having the widest mesh, and is represented in the annexed sheet of drawings.
Fig. 1, is an elevation of an improved screen with three sieves, constructed
according to my invention, part of the sieves being removed to show the interior.
Fig. 2, a diagram showing the tapered sieves.
In carrying out my invention in constructing a revolving screen for coal, such as is
shown in Fig. 1 of the annexed drawings, for example; I use three parallel cylindrical
sieves marked A, B, C. I make the inside sieve A longer than the others, and of the
largest required mesh; the second or middle sieve is shorter and of smaller mesh
than A, and the outer sieve C is still shorter and of the finest required mesh.
These sieves are arranged and firmly secured one within the other as shown in the
drawings, and so as to leave a distance of six inches or thereabouts between them all
round, and projecting one beyond the other at the front or discharging end, according
to the difference in their length.
The centre sieve A is left open at the back end to receive the coal, and they are all
open at the discharge end for the escape of the coal that cannot pass through the
mesh.
The coarse sieves may be constructed with bars or rods and the finer ones of woven
wirework secured to strong iron hoops D, and each sieve is strengthened and supported
by stretcher rods E, secured by nuts to end plates F, which are in turn carried by the
central driving shaft G.
The screen so constructed is fixed in an inclined position, so that the coal which is
fed into the back end of the centre sieve from the shoot H, will not only drop through
and be separated by the sieves according to its size, but will travel by gravitation
down towards the open ends and be discharged into separate shoots and conveyed to
trucks, or otherwise disposed of as desired.
The screen may be caused to revolve by any suitable application of power, such as
a worm I, and worn wheel J, as shown, or small screens may be driven by hand.
Instead of carrying a driving shaft G, through the centre of the screen, I may
dispense with such shaft, and support the screen upon a series of roller bearings fixed
under the end plates F; I may also use such roller bearings to take the end thrust of
the screen when carried by a central shaft.
In case there is difficulty in arranging the driving gear to work with an inclined
shaft, or for any other reason it may be desirable to keep the axis horizontal, I make
the sieves which form the screen of a tapered or funnel shape as in Fig. 2, which thus
produces an incline and causes the coal to travel down to the exit.
When it is desired to shut off the working of the finer sieves, say for example the
outside one, I use a plain cylinder of sheet metal, or a number of curved sheets, and
secure then to the inside or outside of such sieve, closing the mesh and preventing
the passage of the coal that would otherwise have passed through the mesh."
Having now particularly described and ascertained the nature of ny said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
An improved revolving screen for coal and the like, consisting of two or more

page_text: parallel or tapered cylindrical or tubular sieves all concentrically arranged and
supported the longest sieve with the largest mesh or apertures being in the centre,
and the shortest sieve with the smallest mesh being outside, substantially as herein-
before described and illustrated.
شيد
1
1000
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.