Improvements in Flour Sifting Sieves.
Year: 1892

page_text: Date of Application, 26th Sept., 1892
Complete Specification Left, 20th June, 1893-Accepted, 22nd July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Flour Sifting Sieves.
I, AUGUST SCHLEE of Hagenow, Mecklenburg in the Empire of Germany,
Miller, do hereby declare the nature of this invention to be as follows:-
:-
My invention refers to horizontal or inclined sieves and consists in causing their
sides or walls to move or vibrate with a swinging or shaking motion and also if
desired in making the cover or top of similar sieve material, that is to say of the
same material as is used for the bottom so that a complete enclosed sieve which sifts
equally on all sides may be constructed.
The advantage my invention have over the old sieves that have been in use up to
the present is easy to see, for when the sieve is shaken or otherwise moved, the
material inside dashing up against the sides is sifted in the same way as when
falling on the bottom, whereby many arrangements in use in certain sieves, such for
instance those for loosening the material to be sifted when it clings to the inside.
walls are rendered superfluous.
In the old sieves no account is taken of the elasticity of the gauze or other
material used to make the bottom of the sieve and from the first it is nailed fast to
the frame.
The result of this is that as time goes on the gauze or other material stretches
and there being no means of tightening it, the sifting power of the sieves is much
impaired by the continual to and fro movements made by the loose gauze.
If a very mealy material is being sifted the small holes become blocked up and
frequent brushing and beating is necessitated to keep them open which wears out.
the sieve in a very short time.
The remedying of this defect is also an object of my invention and can he
inanaged easily and advantageously.
The sides and bottom which are made of silk gauze or other suitable material
may be fastened or bound by means of string or wire instead of being nailed, so
that they can be tightened or loosened at will, thus providing for the elasticity of
the netting.
My new contrivance has also the obvious advantage of lightness, as the heavy
wooden sides of the frame, that are to be found in the old sieve, are avoided. This.
lightness in weight is a great gain as it makes less force necessary to produce the
motion and therefore the sieve is not so severely shaken by the machinery.
Dated this 26th day of September 1892.
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Flour Sifting Sieves.
I, AUGUST SCHLEE of Hagenow Mecklenburg 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 horizontal or inclined sieves, such as are used for sifting
meal and for like purposes, and consists in causing their sides or walls, and cover or

page_text: top, to vibrate or swing to and fro so as to keep the contents in motion; also if
desired, in furnishing the cover with similar sifting substance to the sides or bottom,
so that a complete enclosed sieve which sieves equally well on all sides, may be
obtained.
The advantage my invention has over the old sieves that have been in use up to
the present is easily understood for when the sieve is shaken or otherwise moved,
the material inside, dashing up the sides is sifted in the same way as when falling
on the bottom, whereby many arrangements in use in certain sieves, such as for
instance those for loosening the material to be sifted when it clings to the inside
walls are rendered superfluous. In the old sieves no account is taken of the
elasticity of the gauze or other material used to make the bottom of the sieve, and
from the first it is nailed fast to the frame. The result of this is that as time goes
on the gauze or other material stretches and there being no means of tightening it
the sifting power of the sieves is much impaired by the bagging and continued
sagging of the loose gauze.
My invention remedies another effect, namely that when a mealy material is
being sifted the holes in the cloth are apt to become choked and frequent beating
and brushing is necessitated to keep them open, which wears out the sifting cloth in
a very short time.
The sides and bottom which are made of silk gauze or other suitable material
can be fastened or bound by means of string or wire instead of being nailed, so that
they can be tightened or loosened at will, thus providing for the elasticity of the
material.
My new contrivance has also the obvious advantage of lightness, as the heavy
wooden sides of the frame that are to be found in the old sieve are avoided.
This lightness in weight is a great gain as it needs less force to produce the
motion and therefore the sieve is not so severely shaken by the machinery. More-
over the cover of the sieve can be utilised as a prior or preparatory sieve by
erecting around it the usual walls, and thus partly sifting the material before
admitting it inside the sieve proper.
I will now describe the invention with reference to the accompanying drawings
in which
Fig. 1 shows a longitudinal horizontal section, and Fig. 2 a horizontal vertical
section of a double sieve with two passages, one at the side of the other. Fig. 3 is
a horizontal longitudinal section of the same.
Fig. 4 is an enlarged section of the straining bar d, and arrangement for straining
the sifting cloth.
a, is the bottom sifting cloth. b, b, are the side sifting cloths. c the top sifting
cloth. d, the straining bar. e, the tightening cord which winds round d. f, is
the metal strip with holes or hooks. ff, are the holes in f
A, is the frame. A', A2, are the sieve chambers for receiving the meal. B, is
the entrance end of the sieve. B¹, is the outlet end of the sieve.
The sieve shewn in the drawings (Fig. 1) has two sifting passages A¹ and A², in
one frame A, adjoining each other. The bottom of A², is formed of silk gauze or
other suitable material, of which also the sides and top are composed. The edges
are turned and sewn between the strips ff, (see Fig. 4).
These strips ff have a large number of holes or hooks to receive the tightening
cord e, by which the sifting cloths are strained up and tightened and fastened to the
bar d.
Instead of this arrangement the sifting cloths can if preferred be fastened by
nails or in any other suitable way.
At the ends of the sieve are the entrances B, B, and outlets B', B¹.
It is obvious that if meal or other material to be sifted is gradually introduced
at B, and the sieve is kept briskly in motion, sifting will take place on all sides of
the sieve and the material will receive the largest possible amount of sifting as it
travels towards the outlet B¹.

page_text: 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 :-
A sieve with shaking or swinging motion, and with walls or sides which can all
serve as sifting surfaces, as herein described and set forth.
Dated this 20th dow of Iun 1962
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.