Improvements in Sifting Machines.
Year: 1895

page_text: Date of Application, 28'h Aug., 1895
Complete Specification Left, 28th May, 1896--Accepted, 11th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Sifting Machines.
I REGINALD HADDAN, of the Firm of Herbert Haddan & Co., of
18 Buckingham Street, Strand London, W.C:; Patent Agent, do hereby declare
the nature of this invention, a communication to me from abroad by August
Marx, Millwright, of Schwerin i/M., in the Empire of Germany to be as
follows:-
This invention consists in a rotary sifter with several sieves of a circular or
polygonal shape arranged below each other.
The supplying of the sifting material to the sieve surfaces is produced from
crescent shaped rays or openings, the breadth of which decreases towards the
middle of said sieves, the sifting material thus passing through crescent shaped
orifices arranged in the spreading boards or floors. The sifting material and with
it the bran have a tendency to move towards the interior of the sieve.
Between each set of sieves is arranged a collecting chamber, the cover and
bottom of which represent, in connection with spiral tubes, the distributor as
characterized above, as well as a means for discharging the bran, it taking the
latter from the edge of the sieves or if desired by omitting the slightly inclined
tubes, discharging at the edge.
The side walls of the casing of said sifter may form doors with hinges, for
the purpose of removing the single segments of which the flat sieves may be
composed.
In place of the collecting chambers described, serving as discharge apparatus for
the bran, feed screws (Archimedian screws) may be arranged on the bottom of the
circular or polygonal sifter to be actuated in the manner of a sun and planet
system to transport the bran and, if required, the flour from the centre to the
exterior of the sieves.
Din 20th day of Au 1895
Improvements in Sifting Machines.
I, REGINALD HADDAN of the Firm of Herbert Haddan and Co. of
18 Buckingham Street, Strand, London W.C., Patent Agent, do hereby declare
the nature of this invention (a communication to me from abroad by August
Marx of Schwerin i/M. in the Empire of Germany, Millwright) and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention consists in a rotatory sifter with several sieves of a circular or
polygonal shape, arranged below each other; the supplying of the sifting material
to the sieve surfaces is produced from crescent-shaped rays or openings the
breadth of which decreases towards the middle of said sieves, the sifting material
thus passing through crescent shaped orifices arranged in the spreading boards or
floors. The sifting material and with it the bran have a tendency to move towards
the interior of the sieve..

page_text: Between each set of sieves is arranged a collecting chamber the cover and
bottom of which are in connection by crescent shaped tubular passages, the dis-
tributor as characterized above, serves as a means for discharging the bran it
taking the latter from the edge of the sieves, or if desired discharging at the
edge.
The side-walls of the casing of said sifter may form doors with hinges, for the
purpose of removing the single segments of which the flat sieves may be composed.
In place of the collecting chamber described serving as discharge apparatus for
the bran, feed screws (Archimedian screws) may be arranged on the bottom of the
circular or polygonal sifter to be actuated in the manner of a sun and planet system
to transport the bran and if required, the flour from the centre to the exterior of
the sieves.
In the annexed drawing
Fig. 1 is a vertical section through the apparatus,
Fig. 2 a plan-view thereof, several parts being omitted,
Figs. 3 and 4 essential parts of the improvement in plan-view,
Fig. 5 is an exterior perspective view of the apparatus.
The sifting body receives its rotary movement by means of the crank-disk N in
the known manuer and may be provided with any of the known support or
suspension-devices.
The material to be sifted passes from the entrance a (Fig. 1) upon the flat
strewing plate d, which distributes the material upon the first sieve A, through the
crescent shaped slots d' which are arranged circularly and diminish in width
towards the centre of the sieve.
This distribution is effected equally owing to the diminution of the width of the
crescent shaped opening of the sieve-flat which diminishes towards the interior.
If the distribution of the material in the described manner has taken place upon
a large part of the sieve-flat, that is to say upon the extreme zone of the sieve-
surface, corresponding to that of the curve of the crescent openings, the further
spread of the material towards the centre of the sieve tends according to the nature
of the granular or powder-like material under the influence of the shaking
movement and of the continually fresh arriving material, to spread out in an equal
horizontal plane where no hindrance opposes it.
The material taken from the first sieve falls upon a cover e of a collecting
chamber B.
The collecting chamber B is traversed by tubes D of crescent-like curved form
and by means of these tubes the material is spread upon the next sieve A. in the
same manner as by the slits d¹ of the strewing plate d.
The distribution and the conducting away are effected also on the last sieve in
the same manner, in order that all the sack-tubes may hang down the side of the
sifting-box.
It would be suitable, to provide the slits d with a feed-regulator in the form of
circular slides or with any other arrangement which allows the arrival of the
material to be sifted to be regulated by hand.
Fig. 5 shows that the single sieves A consist of juxtaposed polygonal sections
and may be pulled laterally out of the box on opening the doors F.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim, is.
1.) A rotary sifter with several sieves arranged one below the other of circular
or polygonal form, the spreading of the material to be sifted upon the sieve-
surfaces being effected through crescent shaped openings the width of which
diminish towards the centre of the sieve, such openings d d being formed in the
strewing plates d and e and by which method of distribution the sifted and the
unsifted material receives a movement towards the sieve-centre.
2.) In a sifter as described in Claim 1.) the collecting chamber B which is

page_text: arranged between each sieve set A and the cover and bottom of which in connection
with the strewing tube D form both the distribution described in Claim 1 and an
arrangement for conducting away the unsiftable material, in order to catch the
latter without use of inclined tubes, at the border of the sifting body.
3.) In a sifter as described in Claim 1) of polygonal form, the formation of the
side walls F forming the polygon as doors with hinge-joints for the purpose of
removal of the flat-sieves A consisting of single segments from the sides of the
polygon.
Dated this 28th day of May 1896.
R.
HADDAN,
18 Buckingham Street, Strand, London, W.C.