Improvements in Circular Sifters with Interchangeable Frames
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Circular Sifters with Interchangeable Frames.
A communication to me from ADOLPH KLOSE, of Raudten, Silesia, in the Empire
of Germany, Mill Owner.
I, EDMUND EDWARDS, of the Firm Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings Chancery Lane, in the County of
Middlesex, 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 and accompanying drawing, that is to say :-
This invention relates to improvements in circular sifters such as are used in flour
mills, and it has for its object to render the interchangeability of the frames or
walls of the sifter possible, whilst still retaining the use of the exterior cleaning
brushes.
By the use of such interchangeable frames, it is possible to alter the size of mesh
as may be required, or to remove frames which may be worn out.
It has already heretofore been proposed to make sifters of rectangular cross-
section with removeable frames, but difficulties have been met with, in attempting
to make circular sifters, used with cleaning brushes, with similarly removeable
frames, the brushes not leaving space for the means whereby the frames are
attached to the cylinder. By the use of the present invention, however, this
difficulty is overcome and the employment of several groups of frames possible.
In the accompanying drawing, which is in illustration of the invention,
Figure 1 is an end view of the apparatus, and
Figure 2 a longitudinal section of the same.
Similar letters of reference indicate similar parts in both figures.
The framing or body of the sifting cylinder consists of a sufficient number
of T-irons a, which are held together by means of corresponding hoop-
shaped T-irons b and angle irons 6. These irons divide the sifter into separate
compartments, which are covered in with wooden or iron frames c upon which gauze is
tightly stretched. These frames are attached to the irons by means of screws.
The cleaning brush consists of the spindle d having a helical surface e carrying
the brushes. The helical surface is interrupted at those parts where the rings 6 lie
under the spindle, so that the spindle d can be brought sufficiently near the gauze
mantle of the sifter and the brushes work effectively upon the same.
The rings b
divide the frames into separate groups I, II, III, &c., (Figure 2). Each group
will consist of frames of the same gauge of gauze whilst on the other hand, the
gauges of the frames of the various groups may be made different.
Group I is for instance provided with gauze of gauge Nr. 11, group II
with gauze Nr. 12, and group III, with Nr. 13. Now if it is wished to provide
the sifter throughout with gauze of one number coarser, all the frames are removed,
and Nr. 11 placed in the position where Nr. 12 previously was, Nr. 12 in place
of Nr. 13 and the place of Nr. 11 can now be filled in by Nr. 10.
By such an arrangement and division of the gauze mantle, the
interchange the mesh of the whole cylinder in a very short
without any inconvenience, and requires for the purpose but one
frames.
miller is able to
space of time
reserve group of
By the use of these interchangeable frames, it is also possible to add within the
sifter proper, a second sifter, on the same shaft. This second sifter, will of course
have no cleaning brush, and will not require one being only intended to serve the
purpose of leading the coarse parts (husks) to the outlet, and thus make a special
husking cylinder unnecessary. Such sifters as that just above described are
designated double sifters.

page_text: 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 :-
Single or double sifters in which the walls are divided into separate inter-
changeable frames by rings (b) round the cylinder, and in which the cleaning
brushes are interrupted at those points where the frames are attached to the cylinder,
substantially as herein described and illustrated.
Dated this 8th day of September 1893.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.