Year: 1887

page_text: Date of Application, 20th Dec., 1887
Complete Specification Left, 11th Aug., 1888
Complete Specification Accepted, 14th Sept., 1888
I, HUGO LUTHER, 61 Frankfurterstrasse, Brunswick, in the Empire of Germany,
do hereby declare the nature of this invention to be as follows:-
My invention is represented in the accompanying drawing in which the Figures 1, 2,
and 3 show three different applications of the same.
A are separating sieves, B is a fixed cover close above the upper sieve, C in the
Figures 1 and 2 is an air forcing pump, and in Figure 3 an air suction pump. The
construction of these pumps is as follows.
In Figure 1 the back wall of the sieve is connected to the fixed wall of the casing
of the apparatus by means of suitable material such as leather. Owing to the to-
and-fro motion of the sieve produced by the connecting rod D the air is alternately
drawn through the flap valve E and forced out through the flap valve F. The
material to be treated, enters at G and is exposed to the air current so that the light
particles of the material are transported gradually towards the eduction port H. The
fixed covering B prevents the air from escaping upwards, and forces the current to
flow over the sieve."
The same principle is applied in Figure 2 to two sieves arranged one above the
other. The air supplied by the pump Centers first the intermediate space between
the two sieves, passes from below through the upper sieve, and is led in the same
manner, as in Figure 1 under the cover B in a direction parallel to the upper
sieve.
In the construction shown in Figure 3, the pump is applied at the eduction
port.
The part J is strongly secured to the sieve, and the bolt K and the plate L are
fastened to the casing of the apparatus. Owing to the shaking motion of the sieve

page_text: the air is sucked up through the flap valve N, and discharged. The entrance for the
air into the apparatus is at O. The working of the ‘apparatus in other respects is the
same as above described.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Sieves or Apparatus for Separating
or Sifting Materials.
I, HUGO LUTHER, 61 Frankfurterstrasse, Brunswick, in the Empire of Germany,
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:-
My invention is represented in the accompanying drawing in which Figures 1, 2,
and show three different applications of the same.
A are separating sieves, B is a fixed cover close above the upper sieve, C, in
Figures 1 and 2, is an air forcing pump, and in Figure 3 an air suction pump. The
construction of these pumps is as follows:-
In Figure 1 the back wall of the sieve is connected to the fixed wall of the casing
of the apparatus by means of some pliable material, such as leather. Owing to the
to-and-fro motion of the sieve produced by the connecting rod D the air is alternately
drawn through the flap valve E and forced out through the flap valve F. The
material to be treated enters at G and is exposed to the air current so that the light
particles of the material are transported gradually towards the eduction port H. The
fixed cover B prevents the air from escaping upwards and causes it to flow over the
sieve.
The same principle is applied in Figure 2 to two sieves arranged one above the
other. The air supplied by the pump (first enters the intermediate space between
the two sieves, then passes through the upper sieve, and is led, in the same manner as
in Figure 1, below the cover B in a direction parallel to the upper sieve.
In the construction shown in Figure 3, the pump is applied at the eduction
port.

page_text: The part J is firmly secured to the sieve and the bolt K and the plate Lare fastened
to the casing of the apparatus. Owing to the shaking motion of the sieve the air is
sucked up through the flap valve N and discharged through the valve M. The
entrance for the air into the apparatus is at O. The working of the apparatus in
other respects is the same as above described.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. In a sieving apparatus, a pump or bellows, such as C, constructed of an elastic
and durable material such as leather. and connected at one end to the sieve frame or
to some part attached thereto, and at the other end to the stationary frame or casing
of the apparatus, the said pump being provided with suitable valves, inlet and outlet,
and being worked by the reciprocating motion of the sieve frame, whereby a current
of air is caused to pass through the sieve, substantially as described and shown.
2. In a sieving apparatus, such as herein set forth, a fixed cover B arranged just
above the sieve and parallel or nearly parallel thereto, whereby the air current is
caused to pass immediately over the sieve, substantially as described and shown.
Dated this 10th day of August 1888.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Agents for the Applicant.