Improvements in Devices for Clearing or Keeping Open the Interstices of Rotary Sieve Drums and the like.
Year: 1896

page_text: Date of Application, 7th Nov., 1896-Accepted, 9th Jan., 1897
COMPLETE SPECIFICATION.
Improvements in Devices for Clearing or Keeping Open the
Interstices of Rotary Sieve Drums and the like.
I, HERMANN KRAMER of Schorndorf, Wurtemberg in the Empire of Germany,
Miller, 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 relates to a means for preventing the stopping up of the interstices,
slits or perforations in sieve drums or barrel sieves and the like.
All the arrange-
ments hitherto employed for this purpose, such, for instance, as brushes, brush
rollers, leather or indiarubber discs and the like are, firstly, very expensive to
make, and, secondly, inefficient, and are worn away in a comparatively short time.
My improved arrangement removes these drawbacks, is extremely simple and
cheap to make, and is yet thoroughly efficient.
The invention shown in Figures 1, 2 and 3 of the accompanying drawings, in
connection with a wheat separating cylinder.
Figures 4, 5, and 6 are shown on a large scale, and represent various separate
forms of construction of the improved arrangement.
This arrangement consists essentially of a large number of wooden pieces C
flexibly mounted side by side with their ends, which may be blunt or pointed,
bearing on the outside of the separating cylinder, or even, if preferred, on the
inside. If stones or portions of grain during the rotation of the drum become
jammed in the sieve interstices, they are directly forced back by these wooden
pieces on passing under the same, or if they are so firmly jammed as to lift the
said wooden pieces, they are caused to fall through by the light hammering action
of the same.
The wooden pieces C are preferably of from 5-15 centimetres in width, and
may be flexibly mounted in various ways. In the separating cylinder shown in the
drawings, these pieces C, lying side by side are mounted between two parallel rails
or boards D, so as to slide independently, as is more particularly shown in Figure 6.
Figures 4 and 5 show a flexible mounting of the pieces C by means of elbow
pieces D D which are pivotally mounted on spindles d' d. Said spindles may lie
in front of or behind the pieces C. Instead of the elbow pieces D' D2 and
spindles dd, it is preferable to flexibly attach the pieces to a fixed lath by means
of strips of leather or fabric. It is evident that it is possible to have a large
number of forms of construction of flexible mountings for the pieces C, and, if
desired, the latter may also be pressed elastically against the drum by means of
special springs or the like.
In order to obtain a perfectly even wearing away of the ends of the pieces C
which bear on the drum B, it is preferable, but not absolutely necessary, to arrange the
perforations of the drum in such a way that the interstices of adjacent rows are
not opposite one another.
The entire arrangement for keeping clear the interstices, perforations or slits in
separating drums is, as will be seen from the first glance, an extremely simple and
cheap one, and my subsequent experience has shown that the wearing of the drum
by the wooden pieces bearing thereon is only very small and need not be taken
into consideration. If the pieces C be pointed above and below, they may be
reversed after ore end is worn out and the other end be used. If both ends are

page_text: worn, the boards are again planed to a point or replaced by new ones. They also
serve their purpose, however, with blunt or only tapering ends.
In place of wooden pieces, pieces of sheet metal or wire loops or the like may be
-employed.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
An improved arrangement for clearing or keeping open the interstices of rotary
sieve drums and the like, consisting of a number of wooden pieces, or pieces of
sheet metal, wire loops, or the like, flexibly mounted side by side to hear on the drum,
preferably sideways on the outer upper periphery of the drum, but, if preferred,
on the inside of the drum, and having blunt or pointed ends, whereby substances
which remain sticking in the drum interstices, on passing under the said wooden
pieces, or pieces of metal or wire loops, are either removed directly by the pressure
of the same, or if they be so firmly jammed as to lift said pieces are forced to drop
through by the hammering action, substantially as hereinbefore described.
Dated this 6th day of November 1896.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Agents for the Applicant.