Improvements in and relating to Middlings Purifiers.
Year: 1893

page_text: Date of Application, 6th June, 1893-Accepted, 8th July, 1893
COMPLETE SPECIFICATION.
Improvements in and relating to Middlings Purifiers.
I, HEINRICH SECK, of No. 15 Leubnitzer Strasse, Dresden, in the Kingdom of
Saxony and Empire of Germany, 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:—
This invention relates to middlings purifiers and more particularly to that class
which are in a well known manner, combined with a suitable dust collector mounted
above the shaking or rotating sieve of the said purifier and which has for its object
to remove from the material on said sieve the dust or other light particles con-
tained therein, the latter being usually by means of a moving body or current of
air, lifted from the said sieve and carried into, and deposited in the dust collector,
from whence they are subsequently discharged at the lower end thereof into
suitable channels or receptacles provided immediately below such dust collector.
The object of my invention is to provide improved means for more speedily and
effectually removing the dust or other light particles from such current or moving
body of air, as hereinafter set forth with reference to a dust collector constructed
and combined with a middlings purifier, as described in the Specification of British
Patent No. 4931 of 1892, although I wish it to be understood that I do not confine
myself to the use of my invention in connection with middlings purifiers combined
with dust collectors of the particular kind described in the said Patent, since the
invention is equally applicable to middlings purifiers combined with other kinds
of dust collectors, provided only that the dust or other light particles collected
by the latter are discharged at the lower end thereof above the middlings purifier.
According to the above-mentioned British Patent the dust or other light
particles collected by the dust collector and dropping down from a number of
obliquely arranged plates or webs at the lower end of the said dust collector is
received by a number of gutters or channels arranged immediately below the
latter.
According to my present invention I provide between the shaking or rotating
sieve of the middlings purifier and the lower end of the dust collector above it,
that is to say, in the space traversed by the dust-laden air on its way from the
said sieve to the dust collector, a roof-like partition so arranged as to cause the
current or moving body of air to impinge against the lower surface thereof and
thus to assume a lateral instead of a straight upward direction of movement and
thence to pass upwards around the sides of the said roof-like partition. By reason
of the lateral direction thus imparted to the air a portion of the dust or other
light particles will be at once directed into, and deposited in, gutters or channels
provided on the sides of the shaking or rotating sieve, without entering the dust
collector at all, and the latter will thus in a measure become relieved of part of
its work. On the other hand, the remainder of the dust or other light particles
which ultimately enter the dust collector and become deposited therein will, in
dropping from the lower end thereof, fall upon the upper surface of the roof-like
partition and, sliding down over the edges of the same will likewise drop into the
gutter or channels provided for the purpose.
In the accompanying drawing I have shown by way of example how my said
invention may be conveniently and advantageously carried into practice.
Figure 1 is a vertical central longitudinal section showing the upper portion
of a middlings purifier and the lower portion of a dust collector, of the kind
described in the above mentioned British Patent, combined therewith, part of the
length of both middlings purifier and connected dust collector being shown as
broken away.

page_text: Figure 2 is a vertical transverse section of Figure 1 with the upper portion
thereof, that is to say, the portion above the roof-like partition, omitted.
d designates a shaking sieve arranged in the upper portion of the middlings
purifier in any suitable and well known manner. Above the said sieve is provided
a comparatively flat roof-like partition a, mounted on a frame e f g h connected
with the said sieve as shown. Immediately above the said roof-like partition a is
the lower end of the dust collector combined with the middlings purifier as
already stated, the said lower end in the drawing being supposed to consist of a
number of obliquely arranged webs or plates 6 intended to receive the dust or
other particles collected thereon, and to allow the same to drop down therefrom
as described in the British Patent above referred to. Such dust or other particles
in thus dropping down from the said webs or plates will, according to my present
invention, be received by the upper surface of the roof-like partition and will
gradually drop over the lateral edges of the same into a number of channels c
arranged below as shown in Figure 2. On the other hand, the current of air
ascending from the sieve below will, on its way to the dust collector above,
impinge against the lower surface of the roof-like partition and will thus become
laterally deflected, so that a portion of the dust or other light particles carried
along by the current or moving body of air will at once be directed into, and
received by, the gutters c, without entering the dust collector at all.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
First. In a middlings purifier and dust collector, connected therewith, the com-
bination with the shaking or rotating sieve of the said middlings purifier, of a
roof-like partition arranged between the said shaking or rotating sieve and the
lower end of the said dust collector above, substantially as and for the purpose
described.
Second. In a middlings purifier the combination with the shaking or rotating
sieve of a roof-like partition arranged above the said sieve and of a receiving
gutter or gutters arranged below the edges of the said roof like partition,
substantially as and for the purpose described.
Third. The roof-like partition a adapted to be mounted above the shaking or
rotating sieve of a middlings purifier, as described.
Dated this 6th day of June 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.