Improvements in Sieves for Grading and Sizing Semolina and other Substances or Materials.
Year: 1892

page_text: Date of Application, 20th Feb., 1892
Complete Specification Left, 27th Apr., 1:92-Acceptied, 28th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Sieves for Grading and Sizing Semolina and other
Substances or Materials.
We,
JOHN MIDGLEY RISHWORTH, of Cragg Terrace, Horsforth, near Leeds,
STEPHEN INGHAM, of York Street, Leeds, and JOSEPHI VICKERS, of Bachelor
Lane, Horsforth, near Leeds, all in the County of York, Corn Millers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to machinery for sorting and separating loose substances
into various grades of fineness, and is particularly applicable for grading and sizing
semolina and for sorting and sizing all kinds of grain.
According to our invention we provide a vertical shaft, on which shaft we fit a
collar or hub having radial arms attached thereto, which support a hoop at their
outer ends. Above the hub we provide a ring or boss, and to this boss is attached
the sifting material, such as wire gauze or silk, and which sifting material is
stretched to the hoop below, thus forming a cone.
By raising or lowering the boss or the hub, the angle of the sifting cone may be
altered and so made to suit various materials of various specific gravities.
From the hoop we suspend a cone of any suitable material to catch the fine
material coming through the conical sieve, and guide it down towards a suitable
opening in the centre. Outside the above mentioned cone we provide another
inverted cone for the purpose of catching the larger particles which have not passed
through the conical sieve, and these may be fed downward onto another .conical
sieve, having similar parts to the one above described, and any number of these
devices may be employed according to the requirements of the material to be
treated.
It is obvious that by altering the angle of the cone, the size of the sieve
perforations, or the speed of the machine, the apparatus may be made applicable
for any kind of grain or other loose or pulverized materials, and the action of these
sieves will be found much more regular than the action of sieves hitherto
constructed, and at the same time will not bruise the material which is a common
failing with sieves at present in use.
In order to clear or clean the conical sieves, we provide an arrangement of
chains, or the cleaning may be done by a brush or brushes, or by a cam motion in
connection with the above mentioned vertical shaft, which gives an occasional
shock or movement to such sieves.
Dated this 20th dor of a 1000
BREWER & SON,
33, Chancery Lane, London, Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Sieves for Grading and Sizing Semolina and other
Substances or Materials.
We, JOHN MIDgley RishwortH, of Cragg Terrace, Horsforth, near Leeds,
STEPHEN INGHAM, of York Street, Leeds, and JOSEPII VICKERS, of Bachelor
Lane, Horsforth, near Leeds, all in the County of York, Corn Millers, 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 machinery for sorting and separating loose substances

page_text: into various grades of fineness, and is particularly applicable for grading and sizing
broken wheat, semolina, and for sorting and sizing all kinds of grain.
In order to shew the application of machinery in carrying out the above, and
that the same may be clearly understood, reference is given to the accompanying
drawings in which similar letters refer to like parts in all the figures.
Fig. 1 is a sectional elevation of a machine constructed according to our
invention, arranged for sorting the material operated upon into two different grades
or degrees of fineness.
Fig. 2 is a side elevation, with the outer framework removed, of a similar machine,
fitted with chain and brush for cleaning the sieve surface.
Fig. 3 is a sectional elevation of a machine constructed according to our invention,
arranged to sort the material operated upon into four different grades or particles
of different size.
Fig. 4 is a plan of same, with the upper part of casing removed, and
Fig. 5 shews in section a modified form of rotary sieve.
According to our invention, and referring particularly to Fig. 1, we provide a
vertical shaft A mounted in any convenient way and driven by means of bevel
gearing or in any other suitable manner. Mounted on the shaft A is a collar or
hub B, having adjustable radial arms C attached thereto, which latter support or
hold at a certain distance therefrom a ring or hoop D. Above the collar B we
provide a hub or boss F, to which are attached any suitable number of spokes E
which extend outwardly from the boss F to the ring or hoop D. These spokes E
support the sieve G, which latter may conveniently be made of wire, silk, or of any
other material to suit the requirements of the substance to be sifted.
Below the ring or hoop D, and attached to the framework, we provide a conical
guide H, which is for the purpose of guiding the material passing through the
sieve G, and H is a conical guide for conducting the coarse material downward to
a second sieve G'. The second sieve G¹ is of a similar construction to the one
described above, except that the boss F¹ is hollow to allow of the passage of the
material from the first sieve G. K is a circular table for receiving the coarse
material from the sieve G. J is an outlet for this coarse material. L is a plough
for removing the material from the table K, and L is a guide for keeping the
material on the table until it arrives at the outlet J. R (Fig. 2) is a brush for
clearing the meshes of the sieve, and S is a chain for the same purpose, and either
one or the other, or both, may be employed.
The working of the apparatus is as follows:-The material to be sifted is fed
onto the first sieve G through a suitable opening N, and the said material, receiving
a rotary motion caused by the revolving sieve G, begins to run down the surface of
same towards the periphery. During this action the material turns over and over
on the sieve surface, and the fine particles pass through the sieve G and are guided
down to the interior of the next sieve G¹ by the conical guide H, whilst the coarse
particles roll over the periphery of the sieve G and are guided down by means of
the guide H to the sieve G₁ below, where they are re-sifted in a similar manner,
and the fine particles pass down through the sieve G', being joined by the fine
particles from the first sieve G, and are fed away by guides H', or by any other
convenient means. The coarse material after falling off the edge of the second
sieve G falls onto the table K attached thereto, on which table K the material is
carried round, being kept thereon by means of the guide L' until it arrives at the
opening or outlet Jinto which the material flies or escapes from the table K by
reason of the centrifugal force caused by the rotary action of the sieve. Should
the material not leave the table K entirely, the plough L removes the remainder
into the outlet J.
For the purpose of clearing or cleaning the conical sieves, we may employ an
arrangement of chains S, or the cleaning may be done by a brush R, as seen at
Fig. 2, or by a cam motion in connection with the vertical shaft A, which gives an
occasional shock or movement to such sieves.
Although the arrangement described above shews the employment of two sieves,

page_text: it will be obvious that one sieve alone could be employed, or any number of rotary
sieves might be placed one above the other forming one and the same machine,
according to the requirements of the material to be treated.
By our invention material may also be graded into any number of degrees of
fineness, and in order to illustrate this part of our invention, we have shewn at
Fig. 3 a machine for sorting loose or pulverized material into four different grades
of fineness. In this arrangement, it will be seen, by reference to the accompanying
drawing, that the rotary sieves, G, G', and G", are mounted on the shaft A in a
similar manner to that described with reference to Figs. 1 and 2. Each sieve
carries a table K on its hoop or ring D, and in the framework O of the machine,
and in front of each table K is an outlet, J, J', and J", and plough L. Guides L'
are employed for keeping the material on the tables K until such material arrives
at the outlet J, J', or J", all similar to those described with reference to Fig. 1.
The material is fed by any suitable means onto the first sieve G, and as it runs
down the sides, the finer parts of the material fall through such sieve G whilst the
larger particles run down to the periphery and fall onto the rotating table K from
whence they pass into the outlet J. The conical guide H diverts the material
passing through the sieve G onto the central part of the sieve G', which material
then passes through a similar operation, the coarsest parts finding an outlet at J',
and the parts passing through the sieve G¹ being fed onto the sieve G". The
coarsest parts of the material fed onto the sieve G pass off by the outlet .J", whilst
the finest pass through onto the table P, from whence they are brushed into the
spout or outlet T. by means of the brush V, of which latter any number may be
employed.
The machine shewn at Fig. 3 could be employed as three separate sifters by
feeding fresh material onto each sieve, and withdrawing the sifted material from
the conical guides H, H', and H" by spouts connected therewith instead of feeding
the said sifted material onto the sieve below as herein before described.
Instead of the table K being fixed to the rim or hoop D, the said table may be
fixed to the framework, and brushes or ploughs made of any suitable material may
be fixed to the hoop D to carry the material round to the outlet J into which it
falls.
Instead of the spokes E being straight, they may be made curved, as shewn at
Fig. 5, thus equalizing the effect of the centrifugal force as the material gets closer
to the periphery.
Although the sieves have all been shewn at or about the same angle or pitch,
they may be made either steeper or at a less angle, or even level, all according to
the work to be done, and in some cases we find it convenient to make the sieves
adjustable in pitch, and thus enable the machines to be used for different
materials.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
1. A rotating sieve or rotating sieves, having a collar or hub B mounted on a
vertical shaft A, radial arms C, rim D, spokes E, and boss F, for dividing loose
substances into two or more separate grades of fineness, substantially as set forth.
2. The combination with a rotating sieve of table K, outlet J, plough L, and
guide L', substantially as and for purposes herein set forth.
3. The combination of the various parts forming the machine shewn at Figs. 1
and 2, substantially as and for the purposes set forth, together with any mere
modification or modifications thereof.
4. The combination of the various parts forming the machine shewn at Figs. 3
and 4, substantially as and for purposes set forth, together with any mere
modification or modifications thereof.
5. The employment of a rotating sieve for dividing loose substances into two or

page_text: more separate grades of fineness, substantially as described with reference to
Fig. 5.
DAL 1
BREWER & SON,
London and Leeds, Agents.