Improved Screen for Washing Stones and Shingle and for Separating Sand and Clay therefrom.
Year: 1892

page_text: The decision of the Comptroller-General, of the 24th day of June 1893,
'
allowed, under Section 18 of the Patents, &c. Act, 1883, an Amendment of
this Specification.
Date of Application, 1st Apr., 1892
Complete Specification Left, 16th Dec., 1892-Accepted, 28th Jan., 1893
PROVISIONAL SPECIFICATION.
Improved Screen for Washing Stones and Shingle and for Separating
Sand and Clay therefrom.
I WILLIAM HOMAN COLLIER, Brick and Tile Manufacturer, of Marks Tey
near Colchester in the County of Essex, do hereby declare the nature of this
invention to be as follows:-
My invention of an improved screen for washing stones and shingle and for
separating sand and clay therefrom consists in the application of a rotary screen or
screens to the said purposes. By preference I use a double screen rotating upon an
axis and subjected to the impact of jets of water. The improved screen is primarily
for use in brickyards where brick-earth containing stone and shingle is washed in a
wash-mill to separate the bulk of the clay and sand. The improved screen is to be
used in brickyards for the purpose of thoroughly washing the stones and shingle
taken from the wash-mill and freeing them from the remaining adherent clay and
thus fitting the stones and shingle for use with cement in concrete work.
I prefer to use a rotary screen specially constructed as follows:-
Upon a central spindle I fix several bosses with arms projecting outwards there-
from which arms I connect by two rings of different diameters but concentric with
the central spindle. Hereinafter I call each set of these rings, arms and bosses a
$ screen-support."
In the smaller ring of the screen supports numerous holes or slots are formed at
equal distances and both parallel to and concentric with the axis. Rods of iron,
steel or other suitable material are secured in these holes or slots. These rods fixed
to the smaller ring of each screen support together form a cylindrical riddle. The
size of the rods and their distance from centre to centre is determined by the size
shingle it is desired to separate from the larger stones.
In the larger ring of each screen support holes or slots are made similarly, but
in this case the rods fixed in them. are not themselves used for screening but act as
supports for woven or other wire screens or for finely perforated sheet metal :--the
mesh of the wire-work or the diameter of the perforations being fine enough to
prevent coarse shingle passing through, while they allow the water carrying the
clay and sand to pass freely.
At the feed end of the inner screen or riddle I attach to the inner ring of the
screen support at that end a short metal cylinder slightly smaller in diameter
than the inner diameter of the inuer screen or riddle. This short cylinder is
furnished with an internal flange at its end furthest from the screen-support. The
central spindle projects beyond this short cylinder, and is carried in a suitable
bearing.
At the delivery end of the inner screen or riddle I attach to the inner ring a
cylinder slightly larger in diameter than the inner screen or riddle and about twice
the length of the cylinder at the feed end. This delivery end cylinder is supported
at its end furthest from the screen support by radial arms projecting from a boss

page_text: fixed on the central spindle which at this end of the screen also projects and is
furnished with a journal and plummer-block for its support. The driving-wheel is
by preference fixed at this end of the central spindle.
The sheets of wirework or perforated metal forming the outer larger screen are
by preference secured to the screen supports by bands passing round the screen the
ends of which bands are furnished with lugs to take a bolt or screw by means of
which the band can be tightly drawn round the screen supports. The sheets may
also be secured with binding wire to the rods before mentioned fixed to the outer
ring of the screen supports.
The screen may be stiffened by forming screw threads upon some of the rods
and screwing them in to tapped holes in the screen supports or by fixing the
rods firmly in or to the supports by rivetting or by means of nuts. Internal brace
rods from the central spindle to the screen supports may also be used to stiffen the
screen.
Ordinarily the outer screen would be of wire-work or perforated sheet metal of
the same mesh or diameter of perforation throughout; but if it be desired to have
parts of the length of the outer screen of different mesh or diameter of perforation
from other parts this may be readily done and might be of service if the screen is
used for washing metaliferous gravels or shingle.
I fix the screen with its axis nearly horizontal; the delivery end being lower
than the feed end. The inclination given is determinable by the speed at which it
is desired to pass a given quantity of shingle through the screen and by the amount
of washing required.
I do not immerse or partially immerse the screen. in water but I fix it above a
sloping delivery table and shoots or hoppers.
The mixed stones, shingle, sand and clay, refuse from the wash-mill, are fed into
the short flanged cylinder and pass into the inner screen of rods. Jets of water
from a trough or pipe are directed against the upper part of the double screen for
its whole length; and the water passing through the wire work or perforated plates
and through the inner riddle of rods washes the stones and shingle.
The shingle, sand, clay and water pass through the inner riddle on to the inner
.surface of the outer screen of wire work or perforated metal. The larger stones
remain inside the inner riddle and are washed more and more as they pass down its
length. They finally pass through the metal cylinder at the delivery end of the
screen and are received in a suitable bin or hopper or wheelbarrow. In a similar
way the shingle is washed more and more as it passes down the length of the outer
screen and is finally delivered over the delivery end of that screen into its bin or
hopper or wheelbarrow. The water passing through the outer screen and carrying
the clay and sand passes down a sloping table or trough on which the coarse
sand collects while the very fine sand and clay pass away to the settling pits.
Although by preference I use a rotary screen constructed as described I do not
limit myself to the use of that particular construction but I claim to apply any
form of rotary screen to the said purposes.
Dated this Thirty-first day of March 1892.
THOS. WILKINS,
Agent for Applicant..
COMPLETE SPECIFICATION (AMENDED).
Improved Screen for Washing Stones and Shingle and for Separating
Sand and Clay therefrom.
I WILLIAM HOMAN COLLIER, Brick and Tile Manufacturer of Marks Tey 5
near Colchester in the County of Essex, 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 :-
My invention of an improved screen for washing stones and shingle-and-for

page_text: separating sand and clay therefrom-consists the application of a rotary screen or
sereens to the said purposes. By preference I use a double screen rotating upon
an axis and subjected to the impact of jets of water. The improved screen is
primarily for use in brick-yards where brick-earth containing stone and shingle is
washed in a wash-mill to separate the bulk of the clay and sand. The improved
screen is to be used in brick-yards for the purpose of thoroughly washing the stones
and shingle taken from the wash mill and freeing them from the remaining adherent
clay and thus fitting the stones and shingle for use with cement in concrete
work.
I prefer to use a rotary screen specially constructed as follows:-
Upon a central spindle I fix several bosses with arms projecting outwards there-
from which arms I connect by two rings of different diameters but concentric with
the central spindle. Hereinafter I call each set of these rings arms and bosses a
66 screen support.'
In the smaller ring of the "screen-supports" numerous holes or slots are formed
at equal distances and both parallel to and concentric with the axis. Rods of iron
steel or other suitable material are secured in these holes or slots. These rods fixed
to the smaller ring of each screen support together form a cylindrical riddle. The
size of the rods and their distance from centre to centre is determined by the size
shingle it is desired to separate from the larger stones.
In the larger ring of each " screen support "holes or slots are made similarly
but in this case the rods fixed in them are not themselves used for screening but act
as supports for woven or other wire screens or for finely perforated sheet metal the
mesh of the wire-work, or the diameter of the perforations being fine enough to
prevent coarse shingle passing through while they allow the water carrying the
clay and sand to pass freely.
At the feed end of the inner of the inner screen or riddle I attach to the inner
ring of the "screen support" at that end a short metal cylinder slightly smaller in
diameter than the inner diameter of the inner screen or riddle. This short cylinder
is furnished with an internal flange at its end furthest from the "screen support."
The central spindle projects beyond this short cylinder and is carried on a suitable
bearing.
At the delivery end of the inner screen or riddle I attach to the inner ring a
cylinder slightly larger in diameter than the inner screen or riddle and about twice
the length of the cylinder at the feed end. This delivery end cylinder is supported
at its end furthest from the "screen-support" by radial arms projecting from a boss
fixed on the central spindle which at this end of the screen also projects and is
furnished with a journal and plummer-block for its support. The driving wheel is
by preference fixed at this end of the central spindle but may be fixed at the other
end as shewn on drawing.
The sheets of wire-work or perforated metal forming the outer larger screen are
by preference secured to the screen supports by bands passing round the screen the
ends of which bands are furnished with lugs to take a bolt or screw by means of
which the band can be tightly drawn round the " screen supports.' The sheets
may also be secured with binding wire to the rods before mentioned fixed to the
outer ring of the screen supports."
66
"
The screen may be stiffened by forming screw threads upon some of the rods
and screwing them in to tapped holes in the screen supports or by fixing the rods
firmly in or to the supports by rivetting or by means of nuts. Internal brace
rods from the central spindle to the screen supports may also be used to stiffen the
screen.
Ordinarily the outer screen would be of wire work or perforated sheet metal of
the same mesh or diameter of perforation throughout; but if it be desired to have
parts of the length of the outer screen of different mesh or diameter of perforation
from other parts this may be readily done and might be of service if the screen is
used for washing metaliferous gravels or shingle.
I fix the screen with its axis nearly horizontal; the delivery end being lower

page_text: than the feed end. The inclination given is determinable by the speed at which it
is desired to pass a given quantity of shingle through the screen and by the amount
of washing required.
I do not immerse or partially immerse the screen the screen in water but I fix it
above a sloping delivery table and shoots or hoppers.
The mixed stones, shingle, sand and clay, refuse from the wash mill are fed into
the short flanged cylinder and pass into the inner screen of rods, jets of water from
a trough or pipe are directed against the upper part of the double screen for its
whole length and the water passing through the wire work or perforated plates and
through the inner riddle of rods washes the stones and shingle. The shingle sand
clay and water pass through the inner riddle on to the inner surface of the outer
screen of wire work or perforated metal. The larger stones remain inside the inner
riddle and are washed more and more as they pass down its length. They finally
pass through the metal cylinder at the delivery end of the screen and are received
in a suitable bin or hopper or wheelbarrow. In a similar way the shingle is washed
more and more as it passes down the length of the outer screen and is finally
delivered over the delivery end of that screen into its bin or hopper or wheelbarrow.
The water passing through the outer screen and carrying the clay and sand passes
down a sloping table or trough on which the coarse sand collects while the very
fine sand and clay pass away to the settling pits.
Although by preference I use a rotary screen constructed as described I do not
limit myself to the use of that particular construction.
Fig. 1. is an elevation,
Fig. 2. is a longitudinal section,
Fig. 3. is a transverse section,
Fig. 4. is an end view.
a. is the central spindle b. b. b. are the "screen supports," c. c. being the bosses,
d. d. the inner ring, e. e. the outer ring, f. f. are some of the rods passing through
holes in the inner ring and forming the inner riddle, g. g. g. are some of the rods
passing through the outer ring to support the wire work or perforated metal
sheets . ., . i. i. are metal bands to secure the wire work or perforated metal,
K. is the cylinder at feed end with its flange L. M. is the cylinder at delivery end
with its radial supports N from boss O, P is the journal at feed end, Q is the
bearing at delivery end. The material is fed in to K, the washed stones pass
out at R. The washed shingle is delivered at S, while the dirty water sand and
clay are delivered between T. T, U is a water pipe, V is a chain pulley or other
driving wheel.
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. The application of a rotary screen to the purpose of washing stones and
shingle and separating sand and clay therefrom.
2. An improved screen for washing stones and shingle and separating sand and
clay therefrom substantially as hereinbefore described.
Dated this Fifteenth day of December 1892.
THOS. WILKINS,
Agent for Applicant.