Winnowing Wheel for Separating Granular Substances.
Year: 1891

page_text: Date of Application. 27th Nov., 1891-Accepted, 23rd Jan., 1892
COMPLETE SPECIFICATION.
Winnowing Wheel for Separating Granular Substances.
1, OLOF SUNDGREN, Land Surveyor, Östersund, Sweden, do hereby declare the
ature 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 relates to a disposition having for purpose to separate granular
ubstances for instance corn and such like, into several different sorts, this disposition
consisting of a wheel revolving on a horizontal shaft and provided with shovels
which during the rotary motion of the wheel, catch and throw out the particles fed
lown upon the same. It is evident that the particles when being thrown out will
all down at different distances from the winnowing wheel depending upon their
lifferent weight and thus they may be gathered in sorts of different weight into
vessels placed successively one behind another in the throwing direction counted
from the wheel. The winnowing wheel is further so disposed that the particles do
not receive any concussion when falling down upon the same, and further so
that the amplitude of the throw may be regulated with the greatest possible
exactitude.
On the annexed drawing
Fig. 1 represents the wheel in perspective. Fig. 2 is an end view of the same
with the one wheel ring partially removed and Fig. 4 is a top view of the same
wheel. Fig. 3 is a modification.
The wheel consists of three rings A B C placed at a short distance one from
another and by means of arms supported by the horizontal shaft D. Between the
rings A and B are shovels fixed not radially but in a suitable inclination to the
radius and parallel with the shaft D. These shovels have for purpose to throw out
the substance wanted to be sorted and it is evident that the shovels during the
rotary motion of the wheel must always go in advance with the ends directed
towards the shaft D that is to say the direction indicated by the arrows on the
drawing. If the wheel were to be used such as described above that is if the
substance to be sorted were to be fed down directly upon the shovels E during
the rotation of the wheel then the concussion between the shovels and the particles
would owing to the comparatively great speed of rotation of the wheel and owing
to the speed of the falling particles, be so great that the latter ones might easily be
crushed. Therefore the substance to be sorted is not fed down directly upon the
shovels E or between the rings A and B but between the rings B and C. Between
these rings there are also shovels F which all are inclined in the opposite direction
with relation to the shovels E and of which each corresponds to a shovel E and
fixed so with relation to this, that the inner edges of the both shovels are laying in
the same line. Between the shovels F there are fixed as shown on the drawing,
curved walls G the inner edges of which are laying in a line with and resting
against the side edges of the shovels E directed towards them whereby these latter
O form as it were a continuation from the former through every opening H in the
ring B. As shown in Fig. 1 these latter openings are limited at two opposite sides
by the edges of two shovels E and at the two other opposite ones by the edges of
two shovels F. If thus a particle in the manner shown Fig. 2, is fed down upon a
shovel F from a feeding funnel I while the wheel is rotating in the direction
5 indicated by the arrow, it does not produce any concussion but is gliding down
along the last mentioned shovel towards its lower edge, until it encounters the
wall G by which it is transferred in upon the shovel E which owing to its above
position, throws off the particle in a given direction. It is evident that in every
compartment formed by two shovels F and a wall G there will arise a strong air
50 current while the wheel is rotating depending upon the position of the shovels F

page_text: This air current contributes particularly to transfer the matter fed down upon the
shovels F upon the shovels E. In order to produce an adjustable air current even
between these latter shovels there are at their inner edges as shown by the drawing,
lids K turning on pivots running in the rings A and B (see Fig. 1). These lids can
either as shown, Fig. 3, close the openings between the inner edges of the shovels E
altogether or also as shown Figs. 1 and 2 be opened so as to catch during the
rotation of the wheel a quantity of air which then can pass over every shovel E
and thus aid in throwing out the matter to be sorted and in depriving it of dust and
impurities.
In Fig. 3 a modification of the invention is represented. The wheel consists of
two rings between which there are fixed shovels E and adjustable lids K. The
object of this wheel is to feed down the substance to be sorted directly upon the
shovels E but in order to mitigate in some degree the concussion arising hereby
there are doors L pivotted on the outer edges of the shovels which doors may be
turned so as to vary the angle between the door and the subsequent shovel whereby
a particle fed down upon a door may be caused to glide more or less centrally
towards the shovel. It is evident that not all particles can hit the doors but in lieu
the preceding shovels whereby the particles will evidently experience concussions
but if the feeding takes place at the right place of the circumference of the wheel
that is to say that the particles fall so little centrally as possible against the shovels
the sorting can take place without damaging the material.
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:
1. A winnowing wheel for separating granular substances provided with two rows
of blades such as E and F abreast cach row arranged crosswise with relation to the
other and bottoms such as G which from the outer edge of the wheel are inclined
or curved towards the first mentioned blades E with which they coincide in the
same plane the partition wall B between the rows of blades being provided with
openings such as H so that the material to be treated inay glide from one row of
the blades which with one side and bottoms G constitute buckets along the inclined
or curved bottoms G and through the openings H to the other row of blades by
which it may be thrown out without concussion substantially as described and
illustrated in the accompanying drawings.
2. In a winnowing wheel such as described the combination with blades such as E
of lids such as K attached to their inner edges and each corresponding in size with
the openings between the inner edges of two adjacent blades and capable of being
opened more or less for producing stronger or weaker air currents between the
blades E substantially as described and illustrated in the accompanying drawings.
3. In a winnowing wheel the combination with the blades of lids or doors such
as L pivotted at the outer edges thereof and adjustable so as to be more or less
inclined in relation to the next following blades so that the material to be treated
may glide along the doors L and down upon the subsequent blades E and be thrown
out without concussion substantially as described and illustrated in the accompanying
drawings.
Dated this 27th dox of November 1901
W. P. THOMPSON & BOULT,
Agents for the Applicant.