Improvements in or relating to Sieves and the like.
Year: 1897

page_text: Date of Application, 9th June, 1897-Accepted, 18th Sept.,
1897
COMPLETE SPECIFICATION.
Improvements in or relating to Sieves and the like.
GEORGE LUTHER, of Wilhelmithor Promenade 10, Brunswick, in the Empire of
Germany, Manufacturer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The hereinafter described invention illustrated in the accompanying drawing
relates to a movable cleaning clearing or brushing devices for cleaning clearing or
brushing the surface of a sieve without the employment of any direct mechanism
for actuating the device.
In the drawing a a is the sieve channel bb the travelling cleaner carried in it
and of any suitable construction.
These cleaning devices are provided with one or more ratchet devices which
enable the cleaners to travel in the opposite direction after they have finished
their travel in one direction. In Figs. 1 and 2 the tufts c c are made of bristles
wood-fibres steel wire or any other suitable material, the pawls a d (Figs. 3 and 4)
and the springs e e (Figs. 5 and 6) are assumed to be of wood steel or any other
suitable material. They can however be mounted not only laterally as shown in
the drawing but also at the top or bottom of the device.
These ratchet devices could also instead of being arranged on the cleaners be
arranged in one or more corresponding points of the channel. In Figs. 5 and 6
the ratchet devices e e for instance are arranged on the side-walls of the channel.
The working of the apparatus is as follows:-When the channel together with
the cleaner devices in it is caused to reciprocate in a longitudinal direction or
to rotate, then according to the position of the ratchet device and by means of
it a longitudinal or rotary movement of the cleaner takes place in the frame in
one or the other direction for instance that indicated by the arrows. Having
arrived at the end of its movement the ratchet device must be allowed to become
disengaged that is to say to occupy a neutral position, which is attained by forming
corresponding notches or widenings of the path of the cleaning device as indicated
in Figs. 1-4 the device being shown dotted in Fig. 1 the other ratchet devices
such as eccentrics cords with clamps etc. may be employed to obtain the same
result.
During the time that the pawls occupy a neutral position the device is thrown
against the frame wall g1 by the movement or shaking of the sieve the direction
opposite to that indicated by the arrow the ratchet device also following in the
same direction as indicated in dotted lines in Figs. 1 and 2 and the device travels
to the other end g where the same reversal of motion is effected.
The cleaner may be provided with brushes h h or any other device for cleaning
the frame, covered with sieve gauze or material, and also for cleaning the bottom,
or with spaces i, i, for emptying the same, or with both devices at the same time
or also with only one of them.

page_text: 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. Apparatus provided with a ratchet or like device for use in rotating or
reciprocating sieves or the like which without being directly driven has a recipro-
cating longitudinal movement in the channels the direction of movement as well
as the ratchet devices being reversed at the end of their course by the shaking
or movement of the sieve the apparatus being provided if desired with devices for
cleaning the surface and channels of the sieve or for emptying the latter, sub-
stantially as described.
2. The combination and arrangement of parts constituting the complete
apparatus for cleaning clearing or brushing a rotary or reciprocating sieve sub-
stantially as described and illustrated in the accompanying drawings.
Dated this 9th day of June 1897.
BOULT & WADE,
Agents for the Applicant.