Improvements in Middlings Purifiers.
Year: 1894

page_text: Date of Application, 13th Mar., 1894
Complete Specification. Left, 13th Dec., 1894-Accepted, 19th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Middlings Purifiers.
We THOMAS GRAY of 12 Galloway Street Maxwelltown in the County of
Kirkcudbright, Miller, and HERBERT SMITH, Victoria House, Atherton in the
County of Lancaster, Miller, do hereby declare the nature of this invention to be
as follows:-
The invention relates to middlings purifiers having horizontal or nearly
horizontal vibrating sieves, and the object is to so construct such purifiers that dust
and light objectionable matter are more efficiently removed than heretofore from
the material being treated.
In carrying our invention into practice we divide the sieve longitudinally into
sections, having meshes of decreasing fineness the further they are from the feed
end. The said sections which are each separated from the other by a dead plate
having sides converging from the larger to the smaller sections so as to form feed
boxes with delivery openings equivalent to the reduced quantity of material passing
from one section to another. By means of these feed boxes the material is equalized
or spread before passing from one section to another.
:
A further improvement consists in providing a stationary or vibrating plate or
cover above the sieve having funnel shaped openings terminating in necks fitted
with regulating ferrules or valves and surmounted with caps. Each cap has
depending from it an inverted cone which enters the neck of the funnel. The
cones act on the air as it comes up the funnels and guide it on to the capз by which
it is deflected so that the impurities are deposited.
Brushes and other usual cleaning devices are used when required and there may
be more than one plate or cover in each apparatus.
Deted this 10th day of March 1904.
Improvements in Middlings Purifiers.
We THOMAS GRAY of 12 Galloway Street, Maxwelltown in the County of
Kirkcudbright, Miller, and HERBERT SMITH, Victoria House, Atherton in the
County of Lancaster, Miller, 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:-
The invention relates to middlings purifiers having horizontal or nearly
horizontal vibrating sieves and the object is to so construct such purifiers that dust.
and light objectionable matter are in the purifier itself, more efficiently removed
than hereto-fore from the material being treated, thus rendering the discharged air
practically free from dust, and this is effected both by more equitable distribution
of the material on the sieve and consequently more uniform How of air through
every part together with improved deflecting and regulating appliances.
In carrying our invention into practice we divide the sieve longitudinally into
sections having meshes of decreasing fineness the further they are from the feed
D037

page_text: end. The said sections which are each separated from the other by a dead plate,-
that is, a plate without perforations, having sides converging from the larger to
the smaller sections so as to form feed boxes with delivery openings equivalent to
the reduced quantity of material passing from one section to another. By means
of these dead plate-feed boxes the material is collected before passing from one
section to another and is thus fed from section to section at a depth which will
equalize the spread of the material over each section.
A further improvement consists in providing a stationary or vibrating plate or
cover above the sieve having funnel shaped openings terminating in necks fitted
with regulating ferrules or valves and surmounted with caps. Each cap has
depending from it an inverted cone or knife which enters the neck of the funnel.
The copes act on the air as it comes up the funnels and guide it to the caps by
which it is deflected downwards so that the impurities are deposited.
Brushes and other usual cleaning devices are used when required, and there may
be more than one plate or cover in each apparatus.
Figures 1 and 2 are vertical sections at right angles to each other of a purifier
constructed in accordance with our invention, and Fig. 3 is a plan of a sieve used
therein.
a, is the usual or any suitable case. b, is the sieve suspended within the said
case and caused to vibrate in any usual or suitable way. The said sieve bis divided
longitudinally into sieving sections c, c¹, ³, c³, and feeding sections d', d', ds, or into
any other required number of sections. The sieving section c has coarser meshes
or openings than the sections c, coarser than c', and so on. Each sieving section
as it is nearer to the tailings-discharge way e is of decreased width so that there
may be about the same depth of material on each sieving section. The dead or
feed plates d', d, d³, are made converging, and are provided with walls or sides so
as to gather the material delivered from a wider sieving section and delivers it the
proper width and depth to the succeeding sieving section. "d is the receiving, and
the discharge plates of the sieve. g side platform of the sieve on which the
dust collects, and from which it falls by the vibration of the sieve into the worm or
conveyor box h.
If the platform is stationary and separate from the sieve,
brushes or scrapers are used to remove the collected dust.
Above the sieve a is a plate i made with funnel shaped openings j terminating
in necks k. The said openings are preferably oblong with two parallel and two
ta per sides, the necks having parallel sides. 1, are ferrules which surround the
necks and are capable of being raised and lowered. m, are caps above the necks k.
The said caps have cones or knife edges n depending therefrom within the necks k.
The said caps are attached to the necks by arms o, or are suspended from above by
wires or equivalent devices. p suction fan. The air drawn through the purifier
by the said fan passes up through the openings j and necks k, at increasing speed
owing to the contraction of the area by the knife edges and caps. The said caps
deflect the air down so that the dust carried through the openings is deposited in
the channels between the openings. The air. expands in the space above the
openings and leaves the purifier through valves q free from dust. The speed of
the air through the openings i, and through the space above the openings, is
regulated first by the ferrules and second by the valves q. The caps m may be
movable so as to act as valves with or without the ferrules 1. The plate i may be
either stationary as shown or may be attached to and move with the sieve. Brushes
or equivalent means are used to remove the dust in the usual way when the plate i
is stationary. feed way to the sieve a.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim, is :-
First. In middlings purifiers a sieve divided into sections separated from each
other by dead plate feed-boxes substantially as and for the purpose set forth.
Second. Constructing middlings purifiers with a plate having openings

page_text: terminating with necks provided with valves and surmounted by caps having
depending cones, knives, or equivalent devices for the purpose set forth.
Third. Middlings purifiers constructed with
substantially as and for the purpose herein set forth.
Deted the 12th day of December 1894.
sieves and dust collectors
J. JOHNSON,
Agent.