Sieve Surfaces for Moving Sieves of all kinds.
Year: 1892

page_text: Date of Application, 9th Feb., 1892
Complete Specification Left, 4th Nov., 1892-Accepted, 10th Dec., 1892
PROVISIONAL SPECIFICATION.
Sieve Surfaces for Moving Sieves of all kinds.
I, OTTO SCHNELLE, of Stromstrasse 1/3, Berlin, Germany, Miller, do hereby
declare the nature of this invention to be as follows:-
The sieve surfaces employed for sifting various granular or pulverulent sub-
stances, such as crushed ore, small coal &c., as also those used for household
purposes, all suffer from the defect that the more or less fine meshes of such sieves
easily become choked after a comparatively short term of use, thus greatly
impeding and even entirely preventing the sifting process. With sieves that are
worked by machinery it is attempted to obviate this inconvenience by providing
various percussive or brushing devices, or by causing variously shaped bodies to
circulate on the sieve surface together with the material to be sifted, and other
similar devices, but even these do not effectually accomplish their object.
According to the present invention the above mentioned disadvantage is entirely
obviated by not, as heretofore, tightly stretching the sieve surface upon the sieve
frame, but by so attaching such surface that it hangs loose upon the frame, either
in one direction only or in all directions, or by forming the same with one or more
folds of any desired form between the sides of the frame, either parallel or at an
angle thereto.
If now sieve frames with such sieve surfaces are set in motion, there will occur
at those parts thereof where the slack parts or folds are situated a movement in
the sieve surface itself by means of which motion an automatic knocking off of the
granular or pulverulent particles that obstruct the sieve will be effected.
The size, direction and number of the folds is not essential for obtaining the
effect desired, these points being easily determined for the particular material to
be sifted.
Dated this 9th day of February 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Sieve Surfaces for Moving Sieves of all kinds.
I, OTTO SCHNELLE, of Stromstrasse 1/3, Berlin, Germany, Miller, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
The sieve surfaces employed for sifting various granular or pulverulent sub-
stances such as crushed ore, small coal, &c., as also those used for household
purposes, all suffer from the defect that the more or less fine meshes of such sieves
easily become choked after a comparatively short term of use, thus greatly
impeding and even entirely preventing the sifting process. With sieves that are
worked by machinery it is attempted to obviate this inconvenience by providing
various percussive or brushing devices, or by causing variously shaped bodies to
circulate on the sieve surface together with the material to be sifted, and other
similar devices, but even these do not effectually accomplish their object.
According to the present invention the above mentioned disadvantage is entirely
obviated by not, as heretofore, tightly stretching the sieve surface upon the sieve
frame, but by so attaching such surface that it hangs loose upon the frame, either
in one direction only, or in all directions, or by forming the same with one or more

page_text: folds of any desired form between the sides of the frame either parallel or at an
angle thereto.
If now sieve frames with such sieve surfaces are set in motion, there will occur
at those parts thereof where the slack parts or folds are situated, a movement in
the sieve surface itself by means of which motion an automatic knocking off of the
granular or pulverulent particles that obstruct the sieve will be effected.
The size, direction, and number of the folds is not essential for obtaining the
effect desired, these points being easily determined for the particular material to
be sifted.
On the accompanying drawing are shewn by way of example some few of a large
number of forms of such sieve surfaces that can be adopted.
Figures 1 and 14 shew respectively a cross section and plan of a frame R' to
which the sieve surface S' is attached, on the one side to the under edge, and on the
opposite side to the top edge, while between these points of attachment it hangs
loose. Figures 2 and 2ª shew similar views of an arrangement in which the sieve
surface S is attached in such manner to the bottom edge of the frame R³ as to
hang loose in the middle, this being effected for example with silk surface by
moistening the edges thereof before cementing them on the frame, whereby they
are caused to contract, so that when fixed, the central part is in a slack condition.
Figures 3 and 3* shew an arrangement in which the sieve surface S³ fixed to
the frame R is formed with folds lying in one and the same direction, while
Figures 4 and 44 shew an arrangement in which the sieve surface S* is attached
to the frame R* in such manner as to form zig zag folds therein.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
Constructing moving sieves of all kinds with sieve surfaces that are attached
to the sieve frames in such manner that instead of being in a stretched condition,
they either hang loose, either in one direction or in all directions, or are formed
with one or more folds of any desired form, either parallel or at an angle to the
frame, substantially as described.
Dated this 3rd day of November 1892.
ABEL & IMKAI,
Agents for the Applicant.