Improvements in Sand Screening nes.
Year: 1896

page_text: We, HERBERT WILLIAM CLARKE, Crayford Road, Erith, Accountant and
JAMES EMERY, Engineer, 1, Shermanbury Place. Crayford Road, Erith, do
hereby declare the nature of this invention to be as follows:-
In carrying out our invention we provide two or more tubular structures, square
in cross section, the sides of which are covered with metal plate perforated with
holes of various sizes. The plates are fastened to wrought iron or steel frames and
the several structures are placed inside each other and kept at a suitable distance
from one another by corner angle irons. At each end of the central structure is a
cast iron or steel cross-head having arms attached to the sides of the structure, and
through the centre of which passes a shaft: the shaft being fastened rigidly to the
cross-head, and the ends projecting from each end of the tubular structure. These
projecting ends can be revolved in bearings supported on brickwork or masonry at
each end. We place a hopper at one end of the apparatus communicating with
the interior of the inner structure and by which the material is fed in. At the
opposite end is an exit for material. The hopper end of the apparatus is higher
than the exit end, the inclination being from half to one inch per foot of length.
Around the hopper end of the structures is placed a pulley of hard wood or metal
by which the several structures can be revolved, the projecting ends of the shaft
turning in the bearings already mentioned. If driven by hand the apparatus is
supported in a framework of wood, instead of on masonry, and the shaft and the
structure attached thereto, revolved by a handle.
ليم
1000
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents for the Applicants.
Improvements in Sand Screening
nes.
We, HERBERT WILLIAM CLARKE, Crayford Road, Erith Accountant, and
JAMES EMERY, Engineer, 1 Shermanbury Place, Crayford Road Erith, 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 :-
Our invention relates to an improved sand screening machine for separating
sand and other materials into grades of various degrees of fineness, and although
more particularly intended for use with the machine which is the subject matter of
our Patent No. 4600. A.D. 1895, nevertheless, it is capable of use with other
machines and under other circumstances.
In carrying our invention into effect, we proceed in or in about the following
manner, making reference to the accompanying sheet of drawings in which,

page_text: Fig. 1. is a longitudinal section. Fig. 2. a plan, and Fig. 3. a cross section of one
of our screening machines. Similar letters 'denote the same parts whenever they
occur. We provide two or more tubular structures such as a, a, a³, square in
cross section, and having their four sides b, 6, and covered with metal plates,
perforated or formed with meshes, gratings, or equivalents. Portions of such
perforations are shown at c. The perforations, or their equivalents in the inner
casing are the largest, and those in the outer casing the smallest, the intermediate
casing or casings having perforations of intermediate size or sizes. The plates are
fastened to frames e' (preferably of wrought iron or steel) and the several casings
are placed inside each other and kept at a suitable distance apart by corner angle
irons d. At or near each end of the inner casing, is a cast iron or steel cross
head e having arms the outer ends of which are attached to the inner casing.
Through the centre of these cross heads and attached thereto passes a tube g
forming a tubular shaft, which can be revolved round the rigid shaft h, the ends
of which are supported in the blocks or bearings i, the blocks i being themselves
supported on brick, stone, metal, or other supports j. We provide a hopper kat
one end of the apparatus, the said hopper communicating with the interior of the
innermost of the casings, and by this hopper the material is fed into the machine.
At the opposite end of the machine are the exits 1, 1, 1, to allow such material
as has not gone through the screens to find an outlet. The hopper end of the
machine is higher than the exit end, the inclination being from half to one inch per
foot of length. The upper and lower ends m and n of the sides of the inner casing
are not perforated. Around the outer casing is placed a pulley o of hard wood or
of metal, or a combination thereof. The pulley o is attached to the outer case and
by revolving it, by a belt or equivalent, the whole of the casings will be rotated
round the inner shaft h. On the tubular shaft g are a number of helicoidal
arms p, the outer ends of which are attached to the inside of the inner casing, and
the inner ends to bosses q attached to the shaft g. There may be two or more
arms to each boss g.
If desired, the apparatus can be revolved either by hand or otherwise, by
omitting the shaft g and attaching the shaft h to the cross heads e and
revolving it in the bearings i. In this case the helicoidal arms p would be
attached to bosses fastened to h. In operation the material to be screened is put
in the hopper k and from thence passes into the inner casing a. On rotating the
apparatus, the material will in succession be screened through the perforated sides
of casings a, a', and a³, the material which is too coarse to pass through the
perforations of any of the casings, being ejected at the lower end of that particular
casing.
As considerable variation is possible in the apparatus without departing from
the essential features thereof, we do not restrict ourselves to the precise con-
figuration, relative proportions or disposition of the various parts, described in the
above specification or exemplified in the accompanying drawings.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is ;-
CLAIMS.
1. An improved machine for screening sand or other materials, the said machine
consisting essentially in :-
(a) Having two or more casings placed within one another, so that their axes
are coincident.
(b) The said casings being square in cross section and having perforated or
screen like sides.
(e) The inner casing having also helicoidal arms the outer ends of which are
attached to the inner casing and the inner euds to bosses provided on the
tubular or other shaft on or round which the apparatus is revolved.

page_text: (d) The said shaft having an inclination from one end to the other, and the
material to be screened being fed in by a suitable hopper at the higher end
of the machine, the whole substantially as described in the above specifica-
tion and exemplified in the accompanying drawings.
2. An improved machine for screening sand and other materials, the said
machine being constructed and operating substantially as described in the above
specification, and exemplified in the accompanying drawings.
Dated this 26th day of January 1897.
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents for Applicants.