Improvements in or relating to Machinery for Screening and Elevating Crushed Stone, Ore, and like Materials.
Year: 1897

page_text: Date of Application, 17th Dec., 1897-Accepted 5th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in or relating to Machinery for Screening and
Elevating Crushed Stone, Ore, and like Materials.
I, WILLIAM HENRY BAXTER, of 71, Gelderd Road, Leeds, in the County of
York, 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:―
This invention relates to improvements in machinery or apparatus for screen-
ing and elevating, say, crushed stone, or ore, and like materials, such as are used
for macadam, concrete, or railway ballast, as it or they leave, say, the stone break-
ing or ore crushing machine, or which is conveyed thereto from any convenient
source.
Hitherto in screens and elevators used for this purpose--so far as I have been
able to ascertain the greatest inclination given to the screen working upon a
horizontal shaft has been one in twelve, and in order to prevent the material work-
ing out at the inlet end thereof an angle iron has been arranged therein. At the
outlet end of the screen the mouth or orifice thereof, which frequently forms part
of the pulley for the elevator belt, has been made to slightly taper outwards for the
purpose of directing the screened material to pass on to the elevator belt and thence
into buckets. The above arrangements have not been so effectual as might be
desired, owing to the material being able to easily escape the buckets and work
on the side of the belt instead of going direct into the buckets. Further, in
elevator belts as at present constructed the material in passing to the buckets was
very liable to work between the joints of the plates and to cut or damage the
belt.
Now the object of the present invention is to obviate these difficulties and de-
fects, and I achieve this end, first, by constructing a screen with, say, a portion
of its length forming, say, the receiving end, made at any inclination of over two
in twelve, and the angle iron or flange usually employed at the inlet or receiving
end is dispensed with. Second. In place of the slight inclination at the outer or
outlet end of the screen I make the outlet end thereof above the level of the
elevator belt, and provide on the inner periphery of the elevator pulley, or attach
thereto, when desired, a number of direction plates arranged at an angle to the
axis of the screen. And, third, to obviate the material, to be elevated, working
through the joints of the elevator plates and thus damaging the belt, I arrange
the plates to overlap each other as hereafter described, and in some cases dispense
with the main backing of the belt hitherto used.
In the drawings hereunto annexed:
Fig. 1 is a sectional elevation of an elevator and screen.
Fig. 2 a part side elevation of same.
Fig. 3 an enlarged part sectional elevation of elevator and screen constructed
according to this invention.
Figs. 4 and 5 are end elevations respectively of the outlet, and receiving ends
of the screen drawn to the same scale as Fig. 3..

page_text: Fig. 6 an enlarged longitudinal elevation of an elevator belt with bucket shown
in position constructed according to this invention.
Fig. 7 an enlarged transverse section of elevator belt on line at Fig. 6.
Figs. 8 and 9 are respectively a longitudinal elevation and transverse section
of an elevator belt, drawn to a reduced scale, with the main backing of the belt
dispensed with.
A is the framework of the elevator and screen, which may be a fixture, as shown,
or mounted upon wheels. B B₁ the pulleys over and around which is passed the
elevator belt Ĉ, constructed as hereafter described. The buckets D) are mounted
upon the belt C so as to work between pulley B¹ and the pulley (both of which
are mounted upon the horizontal shaft I) on the outlet end of the screen.
pulleys B B are carried in bearings B2 133 mounted on the framework A, and a
rotary motion is imparted to pulley B₁ from any suitable source of power through
driving pulley E, shaft F, and bevel gearing G.
The
The just described arrangement for driving the lower pulley B¹, and the motion
giving parts applied thereto may be applied to the upper pulley B, that is to say,
a duplicate set of bevel gearing, shaft, and pulley is arranged to convey motion
to the top pulley B either directly from some source of power, or from the shaft F,
by a pulley and belting as shown. Also the pulleys BB₁ may be connected to-
gether by a chain or chains passing over them or other suitable pulleys mounted
upon the same shafts as or attached to the elevator pulleys. These arangements
are for preventing the elevator belt from slipping.
H is the screen, which is cylindrical in form and perforated with holes of varying
guages, in its periphery. The screen may be of any desired length and tapers
for the greater portion of its length. The screen is mounted upon the shaft I
carried in suitable bearings on the framework A.
All the above described parts with the exception of the screen H. and elevator
belt C which are constructed as hereafter described-may be of the usual and
ordinary construction.
The receiving end J of the screen H, instead of being provided with the usual
angle iron ring to form a projecting flange around its inner periphery, is pro-
vided with a tapering and plain or perforated end piece as shown. The inclina-
tion of the end piece J is made more than two in twelve in order to prevent the
material operated upon working back and falling out of the receiving end of the
screen.
The outlet end of the screen H is constructed as, follows: -K is the pulley,
mounted upon shaft I, over which one edge of the elevator belt C works. Instead
of making the outlet end to taper to the level of the elevator belt I construct
an inner periphery, either hollow or solid, and cast or fixed thereto,-
as shown
at L Fig. 3, above the level of the belt C. Upon the inner periphery L, in some
cases, I cast on or attach thereto .the direction plates M arranged at an angle to
the axis of the screen II for directing the material more into the centre of the
belt C and thence to the buckets D. When required the direction plates M may
be dispensed with.
The outlet end of the screen H is attached to the pulley K by bolts in the usual
manner.
'
The elevator belt is constructed in either of the following ways:
C is the main portion of the belt, and it is made of India rubber, canvas, or other
belting, upon which are mounted the steel or metal plates C¹ fixed thereto..by
bolts or rivets. A chain in some cases may be used in place of the belting C.
Instead of making the plates C-which are fixed to, the main portion C, flat
as heretofore, I crank or bend the whole or a portion of one edge of the plate to
form a lip C under which the flat or straight edge of the succeeding plate is passed.
When the plates are fixed in position on the main portion C, narrow india rubber
belts C3 are passed over each end of the plates. If so desired the plates C may
be made, say, thinner than those employed at Figs. 6.and 7, and with either
bevelled edges, or the plates may be arranged simply to overlap each other for

page_text: preventing the material elevated from working or passing between the joints of
the plates C¹ and thus damaging the belts CC³. Or in some cases I dispense with
the main portion C of the belt and use narrow belts or chains, such as C³, on
both sides of the plates and at each end thereof. Or I may dispense with the main
portion C of the belt and only employ one set of narrow belts C³, as at Figs. 8
and 9. In this case the plates C¹ may be made with their edges overlapping or
to abut. This last named class of belt is particularly applicable for the larger
class or sizes of material to be elevated.
The buckets D may be fixed to the plates C¹ at intervals apart by bolts, rivets,
or other equivalent means in the usual and ordinary manner.
The herein described improvements may be respectively applied either to screens
alone, or to elevators alone, as well as to screens and elevators combined, as shown in
the drawings hereunto annexed.
The material to be screened and elevated may be fed into the screen H from
any suitable source, such as, say, from a stone breaking machine.
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 combined machinery for screening and elevating, or in screening
machinery alone, a screen, such as H, provided with a receiving end piece, such
as J, made to taper at such an angle as to dispense with the angle iron or flange
usually employed for preventing the material operated upon returning back and
escaping from the receiving end of the screen, substantially as herein described
and illustrated.
2. In combined machinery for screening and elevating, or in screening
machinery alone, the combination with the screen H of the pulley K provided
at the outlet end of the screen, said pulley being provided with an inner periphery
above the level of the elevator belt, said inner periphery being armed with or
without a number of direction plates arranged at an angle to the axis of the screen
for guiding the material to the centre of the belt and thence into the elevator
buckets, substantially as herein set forth and illustrated.
3. In combined machinery for screening and elevating, or in elevating
machinery alone, an elevator belt having metal or other plates arranged and fixed
thereon to overlap each other, either with a backing or main portion of india
rubber, canvas, or other belting and a narrow belting on each side of the elevator
belt, or with the narrow belting alone, all arranged and combined substantially
as and for the purposes herein set forth.
4. In combined machinery for screening and elevating, or in elevating
machinery alone, an elevator belt, composed of metal plates arranged to abut or
overlap each other with a narrow belting on one or both sides and ends thereof
arranged and combined substantially as herein described and as illustrated at
Figs. 8 and 9 of the accompanying drawings.
5. In combined machinery for screening and elevating, or in elevating
machinery alone, the means substantially as herein described for driving the upper
elevator pulleys of an inner elevator from and in combination with the lower
pulleys, as and for the purposes set forth.
6. The arrangement and combination of parts forming the machine as a whole
substantially as hereinbefore described and as illustrated in the drawings here-
unto annexed.
Dated this Sirteanth day of Danamba 1907