Year: 1895

page_text: I, JOHAN ALFRED THERMENIUS of Hallsberg in the Kingdom. of Sweden,
do hereby declare the nature of this invention to be as follows:-
In sheet metal sieves as heretofore constructed the sieve openings are formed
either by cutting off round or other shaped pieces of the sheet or by means of cuts
of suitable shape, made in the sheet, and bending the edges in the one or the other
direction. In the latter case no material is taken away from the sheet. Sieves
of the first named kind have the inconvenience that, when using them for separating
corn, seed and other material from straws, cars, awns or the like, the latter will
stick in the edges of the sieve openings, thereby rendering the cleaning process
more difficult. In sieves of the second kind this inconvenience is in some way
removed, but it has the inconvenience that the transmitting area becomes too small
or is at least considerably reduced.
To avoid both the said inconveniences, the sieve openings according to the
present invention are formed by removing greater or smaller parts of the sheet
and by folding down the edges of the openings thus formed either all round the
circumference or only along part of the same, so that the sieve openings are
surrounded by a kind of collar.
By the arrangement of this collar the edges of the holes obtain a slightly
rounded form. The real sieve surface thereby obtains a character of softness and
smoothness, which in high degree facilitates the passage over the same for the
straw and other substances at the same time as the proper transmitting area is
seen to because of the removal of part of the material, without necessitating the
holes to be excessively great.
When this sieve is used for instance for cleaning seed, mixed with chaff, this
mixture is carried over the upper surface of the sieve in one direction in the
common way, either only by giving the sieve a shaking motion, or by such a
motion in combination with an air current working below the sieve in the direction
in which the chaff and other substances are to be carried away.. In the latter case
the cleaning process is as follows
There being no collar on the anterior side of the sieve holes, the air current has
free passage to the sieve openings and works elevating on the mass of the sieve.
Thereby the easier constituents of this mass are separated from the grains and are
carried past the other sides of the 'sieve openings provided with collar without
sticking on its edges, while the corn in consequence of the shaking motion falls
clean through the sieve.
When the sieve is to be used for such a purpose that only shaking motion but
no air current is to be employed for the work, the sieves are provided with collar
around the whole circumference of the openings.
It is evident that the described construction can be used quite or partly on sieves
whose openings have different forms in plan, depending on the purpose for which
they are to be used the openings may be thus either rectangular, circular, elliptical
or other shape.
Deted this 6th day of April 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: 3355
I, JOHAN ALFRED THERMÆNIUS, of Hallsberg, in the Kingdom of Sweden,
Inventor 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 :-
In sheet metal sieves as heretofore constructed, the sieve openings are formed
either by cutting out round or other shaped pieces of the sheet or by means of cuts
of suitable shape, made in the sheet, and bending the edges in one or the other
direction.
In the latter cases no material is taken away from the sheet. Sieves of the
first named kind have the inconvenience that, when using them for separating corn,
seed and other material from straw, cars, awns or the like, the latter will stick in
the edges of the sieve openings, thereby rendering the cleaning process more
difficult.
In sieves of the second kind this inconvenience is in some way removed, but it
has the inconvenience that the transmitting area becomes too small or is at least
considerably reduced.
To avoid both the said inconveniences, the sieve openings according to the
present invention are formed by removing greater or smaller parts of the sheet and
by folding down the edges of the openings thus formed either all around the
circumference or only along part of the same, so that the sieve openings are
surrounded by a kind of collar.
In the accompanying drawing
Figure 1 is a plan of a sieve, the openings of which are formed with a collar or
projection round three sides thereof.
Figure 2 is a section of the same on the line A B.
Figure 3 is a section ou the line C D.
Figure 4 is a plan of a modified form of sieve.
Figure 5 is a section of the same on the line E F and
Figure 6 is a section on the line G H.
By the arrangement of these collars the edges of the holes present a slightly
rounded form, so that a characteristic softness and smoothness of the sifting surface
is thus obtained, which in a high degree facilitates the passage over the same of
the straw and other substances, at the same time preserving the proper transmitting
area because of the removal of part of the material, without necessitating the holes
to be excessively great.
When this sieve is used for instance for cleaning seed, mixed with chaff, this
mixture is carried over the upper surface y, y₁ of the sieve in the direction
towards Y in the ordinary way, either by simply giving the sieve a shaking
motion, or by a shaking motion in combination with an air current below the sieve
in the direction r, in which the chaff and other substances are to be carried away.
In the latter case the cleaning process is as follows:-
-
There being no collar on the anterior side S, S' of the sieve-holes, the air current
has free passage to the sieve openings and works upward on the mass on the s eve.
Thereby the lighter constituents of this mass are separated from the grain and are
carried past the other sides b, b₁ of the sieve openings provided with collars or
openings without sticking on its edges, while the grain in consequence of the
shaking motion falls through the sieve.
When the sieve is to be used in such a way that only a shaking motion but no
air current is to be employed for the work, the openings are provided with collars

page_text: or projections around the whole circumference thereof as shown in Figures 4, 5
and 6.
It is evident that the described construction can be used wholly or in part on
sieves the openings of which have different forms in plan, depending on the purpose
for which they are to be used, thus the openings may be either rectangular, circular,
elliptical or other shape.
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 :-
In sieves of sheet-metal, in which the openings for the passage of the material to
be sifted formed in the one or the other way are constructed by removing part of
the material, the arrangement that the edges of the said openings are, around the
whole of their circumference or only a part thereof, folded down to form a collar
or projection, in order, without reducing the transmitting surface to facilitate the
carrying away of the substances, which during the cribbling ought to pass over the
plane surface of the sieve.
Dated this 24th day of December 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.