An Improved Sieve for Grain-winnowing Machines.
Year: 1889

page_text: Date of Application, 3rd May, 1889
Complete Specification Left, 30th Jan, 1890-Accepted, 15th Mar., 1890
PROVISIONAL SPECIFICATION.
An Improved Sieve for Grain-winnowing Machines.
I, THOMAS TAYLOR CONIAM, of Waye, Chagford, in the county of Devon, farmer,
do hereby declare the nature of this invention to be as follows:-
--
This invention which relates to machines for winnowing grain consists in an
improved sieve therefor which sieve is substituted for the flat sieve hitherto employed
and in which the grain is first winnowed and sifted before passing to the second
sieve or screen " below.
*
The sieve in which this invention consists is composed of a rectangular cage the
sides of which are perforated or otherwise provided with meshes.
It is inclined towards the "husk box" or receptacle for the refuse.
The sides of the sieve are slid into place in grooves provided therefor in the frame
and are readily removed and replaced. The sieve is carried in suitable bearings in
which it is rotated The grain and refuse are, as the sieve rotates, dislodged from
each of the perforated sides of the sieve in turn and thus the grain is more efficiently
and rapidly winnowed and separated from the refuse, the blast of the winnowing fan
being directed upon both as heretofore
The grain as it passes through the sides of the sieve is received upon the usual
reciprocating screen situated below it.
Dated this 2nd day of May 1889.
NICHOLAS WATTS,
Applicant's Agent.
COMPLETE SPECIFICATION.
An Improved Sieve for Grain-winnowing Machines.
I, THOMAS TAYLOR CONIAM, of Waye, Chagford, in the county of Devon, farmer,
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 which relates to machines for winnowing grain consists in an
improved sieve or riddle for use in such machines.
The improved sieve or riddle is square or rectangular in cross section and is
composed of a skeleton frame of wood or metal, the sides consisting of sheets of
perforated zinc, tin, or other suitable metal or material fixed to or slid into grooves
in the frame. The sieve, is arranged to rotate about an inclined axis, one end being
adjacent to the usual bin of the winnowing machine and the other end opening into
the husk box which receives the refuse separated from the grain being winnowed
and sifted in the sieve. The grain, which is fed into the sieve through the bin afore-
said, is dislodged from each side of the sieve in turn as the latter rotates and is
precipitated on to the side then undermost. Hence the grain is more thoroughly and
rapidly sifted and winnowed, the blast of the winnowing fan being, as heretofore,
directed on to the grain.
Fig. 1 of the accompanying drawings represents a side elevation of a riddle or
sieve, for grain winnowing machines, constructed in accordance with my invention.
Fig. 2 is a view of that end of the riddle which is placed next to the husk box, and
Fig 3 is a transverse section. The sieve consists of a rectangular cage the sides a of
which are composed of perforated sheets of zinc, tin or other suitable metal or
material, the sheets being either fixed to the frame 6 or slid into grooves formed
for their reception therein. The cage is secured at the ends to discs c c¹ to

page_text: which it may either be fixed, or temporarily attached by pivotted bolts, screws or
clips The grain is fed into the sieve from the bin through the aperture e in the
disc c.
The sieve and the discs c c are caused, by suitable gearing, to rotate together
above the usual vibrating screens in the winnowing machine, the sieve being inclined
in such manner that the disc c¹ is lowermost and next to the husk box.
Through the opening in the disc c¹ the husk and other refuse is discharged into
the husk box. Under one method of rotating the riddle the peripheries of the
discs cc thereof are in frictional contact with grooved sheaves or pullies caused to
revolve by a driving shaft, but the riddle may be otherwise rotated by any convenient
means.
It will be readily understood that as the sieve rotates, it causes the grain to be
tossed from one side thereof to the other and the grain being thus constantly agitated
the sieve is prevented from becoming clogged and the grain is more thoroughly and
rapidly separated from refuse, the blast from the winnowing fan being, as heretofore,
directed on to the grain.
After passing through the perforations in the sides of the sieve the grain is received
on the usual vibrating screens which are placed below it.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
In a grain winnowing machine, the use, for sifting the grain delivered from the
grain bin, of a sieve or riddle consisting of a cage, preferably rectangular or square
in cross section, having perforated or reticulated sides and being arranged to rotate,
preferably about an inclined axis, substantially as hereinbefore described with reference
to the accompanying drawings.
Dated this 29th day of January 1890
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, Agent.