Improvements in Sifting Machines.
Year: 1889

page_text: Date of Application, 15th May, 1889
Complete Specification Left, 7th Mar., 1890-Accepted, 12th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Sifting Machines.
I HERBERT JOHN HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street, Strand, W.C. London in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention a communication to me from
abroad by Wilhelm Hahn of Neumühle near Eutin in the Empire of Germany,
Manufacturer to be as follows:-
This invention relates to sifting machines and consists more particularly in an
improved construction of sieve or sifting surface therein.
The said sifting surface is, according to this invention, made with a series of
alternating inclined surfaces and vertical or upright surfaces in such a manner that by
the oscillating motion given to the sieve the materials to be sifted are thrown by the
vertical surfaces of the sieve up the inclined surfaces to fall over the upper edges of
the latter in front of the next vertical surfaces so that by the continued oscillating
movement, the material is caused to travel intermittently along the sieve until it
eventually falls through the meshes.
Such sieve should be made with a return portion or portions of the same nature so
that the track of the sieve shall be practically endless in its operation. To this end
the sieve may be made in two corresponding contrary parts set side by side, the track
being continued at the ends by smooth planes carrying the material from the one
part to the other part.
The general plane of each of these two parts of the sieve should be inclined so that
the outthrow end should be higher than the inlet end the planes joining the ends of
the two parts will then be inclined to allow the material to travel naturally downward
from the one part to the other.
The sieves may be made by fastening the gauze or sifting material onto the edges
of two boards cut or recessed to give the necessary inclined and vertical surfaces
alternately and the general incline of the whole part of the sieve, these boards
being set in a suitable frame.
I do not confine myself to use two straight sieves on this principle but may
similarly connect three or more sieves to form the endless track sieve or may curve
the track of the sieve.
.The larger portions of material will of course continue to travel along the track of
the sieve and will thereby tend to keep every part of the sifting surface free or
unchoked in an equal degree.
D. 1711
с
1000
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in Sifting Machines.
I, HERBERT JOHN HADDAN, of the firm of Herbert & Co., Patent Agents, of
18, Buckingham Street, Strand, W.C. London, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Wilhelm Hahn, of Neumühle near Eutin in the Empire of Germany,
Manufacturer, 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 sifting machines and consists more particularly in an
improved construction of sieve or sifting surface therein.
The said sifting surface is, according to this invention, made with a series of
គ. ។

page_text: alternating inclined surfaces and vertical or upright surfaces in such a manner that
by the oscillating or vibrating motion given to the sieve, the materials to be sifted are
thrown by the vertical surfaces of the sieve, up or upward on the inclined surfaces, to
fall over the upper edges of the latter in front of the next vertical surfaces, so that by
the continued oscillating or vibrating movement the material is caused to travel
intermittently along the sieve until such of it as is of sufficient smallness eventually
falls through the meshes.
Such sieve should be made with a return portion or portions of the same nature so
that the track of the sieve shall be practically endless in its operation. To this end
the sieve may be made in two corresponding contrary parts set side by side, the track
being continued at the ends either by similar transverse parts or by smooth planes
carrying the material from the one part to the other part.
The general plane of each of these parts of the sieve may be level or inclined so
that the outthrow end is higher than the inlet end, the transverse parts or planes
joining the ends of the two parts will then be inclined to allow the material to travel
naturally downward from the one part to the other.
The sieves may be made by fastening the gauze or sifting material onto the edges
of two boards cut or recessed to give the necessary inclined and vertical surfaces
alternately and the general incline of the whole part of the sieve. These boards being
set in a suitable fraine.
I do not confine myself to use two straight sieves on this principle, but may
similarly connect three or more sieves to form the endless track sieve, or may curve
the track of the sieve.
The larger portions of material will of course continue to travel along the track
of the sieve until they are removed and will thereby tend to keep every part of the
sifting surface free or unchoked in an equal degree.
In the accompanying drawing, Fig. 1 is a plan view of the improved sieve. Fig. 2
a longitudinal section thereof on line 11 (Fig. 1). Fig. 3 a cross section thereof on
line II II (Fig. 1). Figs. 4 and 5 show the whole machine in longitudinal section
and plan respectively. A being the sieve on the cross-head guides B the former
being moved to-and-fro by the connecting rod C in the direction of the arrow III
Fig. 4.
The sieve shown in Figs. 1 to 5 comprising two longitudinal parts set each at an
incline and connected at the ends by smooth inclined planes. Fig. 6 is a plan view.
Fig. 7 a longitudinal section, and Fig. 8 a cross section of the end of a modified
construction of sieve in which the two main longitudinal parts, set at an incline, are
connected by two smaller transverse parts taking the place of the inclined planes
aforesaid. Fig. 9 illustrates in plan view a modified method of moving the sieve
with a general circular motion the orientation of the sides being maintained. Fig. 10
is a plan view. Fig. 11 a longitudinal section and Fig. 12 a cross section of the end,
of another modified construction of sieve in which the two main longitudinal parts
are connected by two smaller transverse parts, all the parts being however in one
general horizontal plane. Fig. 13 illustrates this sieve moved by mechanism similar
to that described above with reference to Fig. 9.
A is the sieve being a frame made up of longitudinal planks a al connected at the
ends by cross planks a'; within this frame are fastened the serrated boards a², either
cut tapered or not over which the gauze b is fastened so as to form a sifting surface
in the manner and for the purpose hereinbefore described.
The action of the sieve is as follows:-
If the substance to be sifted is thrown on at x in Fig. 1, 6 or 10, it will be thrown
at each movement of the sieve in the direction of the arrow IV the vertical part of
the step over the edge of the incline in front of the said vertical part and will thus
reach the next step.
The vertical part of this step prevents the substance to be sifted from being thrown
back during the back motion of the sieve.
With the following movement of the sieve in the direction of the arrow IV the
substance to be sifted reaches the following step and thus gradually passes along the

page_text: sieve until it arrives at the inclined plane or transverse part c which serves as a throw
over. In Fig. 1 the substance to be sifted slides over this inclined plane c to the
lowest point of the following sieve-division enclosed by the longitudinal boards a' a¹
where it is raised by one step at each movement of the sieve in the direction of the
arrow. Such material as reinains on the sieve falls eventually from the highest step
of this division onto the inclined plane cover which it slides down to the lowest
point of the sieve division enclosed by the longitudinal boards a a and resumes the
course already made. Coarse pieces which are found in or added to the substance to
be sifted when thrown in at for the purpose of keeping the sieve clean remain
therefore in continuous circulation. Instead of two longitudinal sieves there can also
he arranged a larger number parallel in one frame, the oblique plane c' would carry
the substance to be sifted not to the first but to the third sieve and from the highest
point of the latter or from the last in series the substance to be sifted then falls
back upon the lowest point of the first sieve.
The action of the other modifications is substantially the same, the circular move-
ment given to them causing the material to travel also on the transverse series which
take the place of the inclined planes e c'.
This sifting machine is suitable, according to its size and material, for any material
to be sifted. Covered or made with canvas sifting surface it may be used as a flour
bolting machine.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. In a sifting machine, a sieve having a series of steps or grades each having a
vertical wall and an inclined surface so that by reciprocal movement given to said
sieve in the direction of said sieves, the material to be sifted may be forwarded
intermittently along the sieve substantially as set forth.
2. In a sifting machine, a sieve having a series of steps or grades arranged in
separate groups, relatively arranged or connected by inclined or other planes to form
an endless track along which the material to be sifted is caused to travel when suitable
movement is given to the sieve, by the construction of said steps or grades each with
a vertical wall and an inclined surface substantially as set forth.
3. A sieve consisting of two parallel series of steps or grades horizontal or inclined
and constructed as set forth connected at the ends by planes or transverse series
of steps or grades c c¹ horizontal or inclined substantially as illustrated and
described.
'ה
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1
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.