Improvement in Sifting Machines.
Year: 1889

page_text: Date of Application, 26th Aug., 1889
Complete Specification Left, 27th May, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
Improvement in Sifting Machines.
I, CARL HAGGENMACHER, of Rudolfs quai 8, Buda Pest, in the Kingdom of
Hungary, Director of Grinding Mills, do hereby declare the nature of this invention
to be as follows:--
In the Specifications to my Patents Nos. 10644 and 10645 of 1887 and No. 8558
of 1888 the propulsion and distribution of the material to be sifted was effected by
a grid on the sifting surfaces and sieve bottoms, forming channels having numerous
transverse partitions of which the transverse ribs were only partly carried through, so
that by means of the complete portions of these ribs, the propulsion of the material
was effected, while the portions that were only partly carried through served to
distribute the material. These distributing ribs served to determine a certain
thickness of the layer of material upon the sieve, but they had the disadvantage that
the material had to be thrown by the propelling ribs over the distributing ribs at each
oscillation of the machine, whereby the coarse particles were continually being mixed
up with the fine particles, so that the latter could only with difficulty find their way
to and through the sifting surface.
My present improvement has for its object to obviate this defect, and it consists in
entirely omitting the distributing ribs, and in forming the propelling ribs, which
alone divide the channels transversely, in such a manner that the lower edge thereof
does not come in contact with the sifting surface or sieve bottom. By this means the
entire sifting surface or sieve bottom forms a free circulating surface for the material,
the thickness of the circulating layer being determined by the space between the lower
edge of the propelling ribs and the sifting surface or sieve bottom. The layer of
material circulates freely with a circular motion in this space, so that only such of
the material that is situated higher than the said thickness of the layer will come in
contact with the propelling ribs, and be propelled towards the outlet of the sieve. In
addition to the above named advantage of this arrangement whereby the throwing of
the material over the distributing ribs is prevented, the further advantage arises of
offering an increased screening surface with one and the same sized sieve, so that in
addition to a simplification of the construction, there is also an increase in the working
power or yield of the machine.
1000
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement in Sifting Machines.
I, CARL HAGGENMACHER, of Rudolfs quai 8, Buda Pest, in the Kingdom of
Hungary, Director of Grinding Mills, 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 the construction of sifting machinery containing plane sieves having a gyratory
motion described in the Specifications to my Patents Nos. 10644 and 10645 of 1887
and No. 8558 of 1888, the propulsion and distribution of the material to be sifted was
effected by a grid on the sifting surfaces and sieve bottoms, forming channels having
numerous transverse partitions of which the transverse ribs were only partly carried
through so that by means of the complete portions of these ribs, the propulsion of the
material was effected, while the portions that were only partly carried through served
to distribute the material. These distributing ribs served to determine a certain

page_text: thickness of the layer of material upon the sieve, but they had the disadvantage that
the material had to be thrown by the propelling ribs over the distributing ribs
at each oscillation of the machine, whereby the coarse particles were continually being
mixed up with the fine particles,, so that the latter could only with difficulty find
their way to and through the sifting surface.
The
My present improvement has for its object to obviate this defect, and it consists in
entirely omitting the distributing ribs, and in forming the propelling ribs, which
alone divide the channels transversely, in such a manner that the lower edge thereof
does not come in contact with the sifting surface or sieve bottom. By this means the
entire sifting surface or sieve bottom forins a free surface for the circulation of the
material, the thickness of the circulating layer being determined by the space between
the lower edge of the propelling ribs and the sifting surface or sieve bottom.
layer of material circulates freely with a circular motion in this space, so that only
such of the material that is situated higher than the said thickness of the layer will
come in contact with the propelling ribs, and be propelled towards the outlet of the
sieve. In addition to the above named advantage of this arrangement whereby
the throwing of the material over the distributing ribs is prevented, the further
advantage arises of offering an increased screening surface with one and the same
sized sieve, so that in addition to a simplification of the construction, there is also an
increase in the working power or yield of the machine.
The accompanying drawing shews by way of example an arrangement of sieve
constructed according to my invention.
Fig. 1 is a.sectional plan on the line J-K in Fig. 3 of a complete sieve; Figs. 2
and 3 are cross sections respectively on the lines C-D and A-D of Fig. 1; and
Figs. 4 to 6 represent in plan view and two cross sections the left upper corner of
the sieve frame to a larger scale. In this drawing a is the outer frame which is here
shown divided by five longitudinal ribs into six channels; & is the sieve bottom, ware
the propelling ribs. E is the inlet for the material to be sifted, which is carried over
the sieve in the direction of the arrows.
As has been mentioned above, the lower edges of the propelling ribs do not
come in contact with the sifting surface or sieve bottom.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the saine is to be performed, I declare that what I
claim is :-
In sifting machines containing plane sieves having a gyratory motion, providing
such sieves with transverse propelling ribs extending only partly across the channels
and having their lower edges at a distance from the sifting surface or sieve bottom,
so as to leave a space corresponding to the desired thickness of the layer of material
upon the sifting surface or sieve bottom, substantially as herein described.
Dated this 24th day of May 1890.
ABEL & IMRAY,
Agents for the Applicant.