A New or Improved Sifting Machine with Tipping Movement.
Year: 1895

page_text: Date of Application, 29th Aug., 1895-Accepted, 5th Oct., 1895
COMPLETE SPECIFICATION.
A New or Improved Sifting Machine with Tipping Movement.
1, Reginald HADDAN, of the Firm of Herbert Haddan & Co., of
18 Buckingham Street, Strand W.C. London Patent Agent, do hereby declare the
nature of this invention, a communication to me from abroad by T. Wenzel, of
Magdesprung, i/ Harz, in the Empire of Germany, and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
The present invention relates to au improved sifting apparatus which has its
characteristic features in the manner of its movement and in the method of
operating the feed mechanism.
Reference being had to the accompanying drawings,
Fig. 1 is a cross section of the apparatus. Fig. 2 an end view thereof.
Fig. 3 a top or plan view of the sieve box thereof in partial section.
Fig. 4 shows a detail view.
The sieve box A (Fig. 1) substantially consists of the sieve B and the cover a.
Said box is supported in its longitudinal axis by two trunnions a, a¹ and by means
of an ordinary crank lever, and connecting rod is moved with a reciprocating
motion from the shaft of the screw o which removes the sifted matter from the
chamber below the sieve.
These movements cause the sifting of the material put into the said box, the
latter with its sieve continually changing in oblique position.
The movement is such that the sifting material during movement of the sieve
box has not sufficient time to run down the surface of the sieve when steepest, but
every time the sieve box A reaches its steepest position it remains at rest for a
moment in order to allow the material to roll down the surface of the sieve when
thus at rest.
This purpose may be accomplished by employing different constructions of
the mechanism by which the action is given.
For instance, a slot e may be made in the crank arm q (Fig. 2) in which is guided
the pivotal pin of the connecting rod g. Within said slot the pivot has a dead or
end play which will cause the sieve box to stop at the moment of its steepest
position.
Although the introduction of the sifting material may take place at any place
and in a simple manner the invention also has for its object to provide a new
feed mechanism the idea of which is based on the fact that on account of the
tipping movement really two separate sifting processes take place, and consequently,
the introduction of the sifting material at two ends of the sieve box should be
considered as separate and complete or independent for each respective position of
the sieve.
The feeding will thus be more regular while the loading of the sieve is more-
uniform, and the gauze has not such tendency to get choked.
The new feed mechanism is represented in Fig. 1 of the accompanying
drawing.
The feeding takes place from both sides through sockets c c¹ attached respectively
to the inlet pipe B by hose like connecting picces dd. When the socket c has
reached its lowest position, the material passes through the extended hose d into
the sieve box while the socket c' remains closed in consequence of the temporary
contracted condition of the hose d'; when the lower socket c rises the material is

page_text: raised again thus being subjected to the sifting process by slowly and gradually
rolling across the entire surface of the sieve. During this procedure the hose d
pertaining to the socket c is contracted while the other hose d' again delivers
material into the socket c which now has reached its lowest position, whereupon
the same procedure is repeated.
Fig. 4 shows a projection h formed by a spiral spring, said projection being
fastened to the top of the apparatus, and having for its object to impart to the
sieve box, a slight shake a cach stroke which will contribute towards clearing the
gauze and thus increase the practical effect of the sieve.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. A sifting apparatus having means for reciprocating the sieve between two
oblique and opposite crossing positions, the sieve being after each stroke tem-
porarily stopped in its movement by a combination of a slotted crank arm and
connecting rod or the like, for the purpose of allowing the sifting material
introduced into the sieve box to roll down the entire surface of the sieve when in
either of its extreme oblique positions.
2. A feeding mechanism for a sifting apparatus as described comprising two
hose like tubes d d' communicating with the two ends of the sieve respectively, said
tubes being alternately opened and closed by the movements of the sieve hox A,
for the purpose of effecting a uniform feed and of keeping the gauze of the sieve
clear by thus introducing the material from both sides.
3. In combination with a sifting apparatus as described a spring or solid pro-
jection attached to the frame of the apparatus and having for its object to
produce at each stroke, a slight shake of the sieve box, thus increasing the sifting
effect and preventing the choking of the gauze.
Dated this 29th day of August 1895.
R. HADDAN.