IMPROVEMENTS IN MIDDLINGS PURIFIERS to be as follows:―
Year: 1885

page_text: I, HENRY SIMON, of No 20 Mount Street, Manchester in the County of Lancaster,
Civil Engineer, do hereby declare the nature of my invention for "IMPROVEMENTS
IN MIDDLINGS PURIFIERS to be as follows:―
"
My invention relates to machines for purifying middlings, such as are referred to
in a Provisional Specification filed by me on the 14th July 1885, in which a grid of
trough like channels with spaces between them was interposed between the sieve
and the travelling. filter cloth for collecting those particles rising from the sieve
that fall back before reaching the filter cloth..
According to one of my present improvements, in place of employing only one
such grid of trough like channels between the sieve and filter cloth, I arrange two
or more thereof, one above the other, so that the heavier of the rising particles will
fall into the lowermost set of channels while the lighter particles will fall into the
upper set or sets of channels, whereby I effect a more perfect sorting of the
different descriptions of particles. The said grids may either be stationary or
movable as described in my aforesaid specification According to another improve-
ment, instead of constructing the grid or grids of trough like channels, some of
them may be made. wholly or partly of solid bars or laths, the object of the grids
being in this case, to contract and consequently intensify the current of air
immediately after it leaves the sieve by causing it to pass through the narrow
openings between the bars or laths. One or more of such grids with solid bars
may be applied with one or more of the grids with trough shaped channels.
According to another improvement I, in some cases, entirely dispense with the
travelling filter cloth, the whole of the particles raised from the sieve being allowed
to deposit in the trough like channels of the grid or grids.
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I, HENRY SIMON, of No 20 Mount Street, Manchester in the County of Lancaster,
Civil Engineer, 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 :-
In machines known as middlings purifiers it is usual to employ a rapidly
oscillating sieve on which is spread a layer of semolina or middlings which is kept
shaking and moving onwards while a current of air passes through it, carrying up
with it fine particles or dust. In many such machines there is provided above the
sieve a travelling filter cloth through which the air is made to pass depositing on
the surface of the cloth the dust suspended in it. Also in some of these machines,
besides their oscillating sieves and their travelling filters, there are interposed,
between these two parts, grids of troughs or bars in some cases attached to and
oscillating with the sieves, in other cases separate from the sieves or stationary.
Such grids are described in the Specifications Nos 5155 and 13502 of 1884 and
in N° 8542 of 1885. By means of these grids the air currents ascending from
the materials on the sieves are affected in the following manner: Retaining
considerable velocity in passing through the contracted area offered by the
interstices between the troughs or bars of the grids, the currents carry with them
the particles eliminated from the material on the sieve, but in expanding above the
grid after passing through these contracted openings, they, in losing velocity,
deposit on the troughs or bars of the grid a large proportion of the dust and
particles carried up by them, and the matters so deposited are removed by travelling
brushes or otherwise, as described in the Specifications above referred to.
-
Now I have found that, by arranging such a grid, or two or more superposed
grids of troughs or bars over the whole area of the oscillating sieve of a middlings
purifier, and dispensing entirely with the travelling filter which is usually applied
in conjunction with them, the purifying action on the material on the sieve is
efficiently performed, and the air, after depositing in or on the troughs or bars of
the grids the particles suspended in it, retains comparatively little dust, so that
it can, without inconvenience, be conveyed to a stive room or dealt with by-a
separate dust collector.. My present invention, therefore, cousists in dispensing
with the travelling filter usually employed in a middlings purifier whilst I arrange
immediately over the oscillating sieve a grid of troughs or bars or several super-
posed grids' such as are described in the Specifications above referred to. By
thus dispensing. with the travelling filter and the machinery for working it
in a middlings purifier I effect considerable economy of space and cost without
sacrificing efficiency, and by applying grids of the kind described to existing
purifiers which have no travelling filter I can, at comparatively small cost, increase
their efficiency and give means of separating and collecting a large proportion of
the particles carried by the air currents.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
In a middlings purifier, the combination of a grid of troughs or bars or of
several such superposed grids with the oscillating sieve, dispensing entirely with
the travelling filter, substantially as and for the purpose herein set forth.
ABEL & IMRAY,
Agents for the Applicant.