Improvements in or relating to Middlings Purifiers.
Year: 1892

page_text: Date of Application, 2nd June, 1892
Complete Specification Left, 2nd Mar., 1893-Accepted, 2nd Seot.. 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Middlings Purifiers.
I, JAMES HIGGINBOTTOM of 32 Seel Street, Liverpool, in the County of
Lancaster, Milling Engineer, do hereby declare the nature of this invention to be
as follows:-
In middlings purifiers as heretofore employed for purifying grits, semolina,
middlings, dunst or other coarse or fine granular substances it is usual to have one
vibrating sieve fixed in the framework of the machine and to treat one kind of
material at a tiine on such sieve, or to divide such sieve into two or three parts by
one or more partitions; in some cases two sieves are worked separately side
by side.
In carrying out my invention I arrange two, three, four or more sieves in the
one machine, and I place such sieves one above the other.
I also prefer to arrange such sieves with a dust collecting tray and expanding
chamber over such sieve, and I connect such chambers with a separate enlarged
expanding chamber or chambers placed either on the sides or top, or on the sides
and top of the framework of the machine.
Each upper sieve is preferably moved in a direction opposite to the direction
of the sieve immediately below it, in such manner that the tails or the tail
sheet material from the upper sieve may fall by gravity on to the head of the
sieve below.
I may also arrange for any of the sieves to separately receive its feed and
discharge its products from and to the outside of the machine.
The purified material from the sieves may be removed by means of a vibrating
tray, or by conveyors in the usual well understood manner.
I prefer to connect the separate expanding chamber or chambers with an exhaust
fan discharging into the open air outside of the machine.
In some cases I make the machine with two tiers of sieves and I place two,
three or more sieves in each tier, and I may if desired construct the separate.
expanding chamber either between the two tiers of sieves, or over the tops or
between and over the tops of the two tiers of sieves.
"
When using two tiers of sieves, in some cases I arrange so that two contiguous
sieves may balance each other during work by means of eccentrics set at a suitable
angle in relation to each other.
In some cases each separate sieve may be fitted with one or more partitions.
Also in some cases I fit an aspirator to the overtails from each sieve.
Dated this Second day of June 1892-
W. P. THOMPSON & BOULT,
Agents for the Applicant.
June
COMPLETE SPECIFICATION.
Improvements in or relating to Middlings Purifiers.
I, JAMES HIGGINBOTTOM of 32, Seel Street, Liverpool in the County of
Lancaster, Milling 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:-
This invention relates to improvements in apparatus for purifying semolina,
middlings and the like, so constructed and arranged that the air which is forced or
drawn through the sieves of such purifiers is caused to pass through openings and
|| rice |

page_text: chambers and has the direction and speed of its currents controlled in such manner
that the dust and fine particles suspended in the air are for the most part deposited
before the air issues from the purifier.
"
I construct and arrange the purifier with side or end chambers placed on the
side or end of the purifier for the purpose of obtaining an increased capacity of
air expansion or depositing room for the better and more complete deposition of
the dust.
In a purifier having side or end dust depositing chambers, I preferably use one
sieve in each vibrating sieve frame, and in some cases I place two or more vibrating
frames and sieves one above the other to form a single tier of vibrating frames and
sieves, as illustrated in Figures 1, 2 and 3, or to form a double tier of vibrating
sieves, as illustrated in Figures 4 and 5.
When using tiers of sieves, I preferably arrange the vibrating frames and sieves
with crank shafts and cranks in such manner as to balance each other during work,
as is more particularly described in my Patents No. 18643 of 1889 and No. 2284
of 1890.
In the drawings, I have shown the sieves vibrating vertically, but in some cases
I arrange the sieves to vibrate horizontally in the well understood manner.
In the drawings:
Figure 1 is a longitudinal section :
Figure 2, a horizontal sectional plan on line W. W; and
Figure 3, a vertical transverse section of a machine having a single tier of two
vibrating frames and sieves.
...(.
Figure 4 is a transverse vertical section of a machine having a double tier of two
vibrating frames and sieves.
Figure 5 is a horizontal sectional plan on line X X of a machine with a double
tier of vibrating sieves.
Figure 6 is a vertical transverse section on lines Y. Y of a machine with a single
tier of vibrating sieves, and, on lines ZZ, of a machine with a doublé tier of
vibrating sieves.
:
A, is the framework of the machine, within there are mounted the sieve
frames B-B, placed one above the other and operated by means of crank shaft C
and cranks C connected by rods C with the sieves B B.
The space D above the sieve is the usual dust depositing chamber common to
purifiers, into which the dust laden air enters after passing through the sieve.
The space E is a side chamber communicating with the space D over the upper
sieve by means of apertures in the partition F.
The space E' is a side chamber communicating with the space D' over the lower
sieve by means of apertures in the partition F¹.
The air and dust pass from the spaces D and D₁ through the apertures in
partitions and F¹ into the side chambers E and E¹, and the said dust is then
deposited in the spaces E and E' and falls by gravity on to the surfaces of the
lower part of the spaces E and E¹ and is removed from thence by gravity by
means of a suitable form of air-tight dust discharging device G, such as that
described in my Patent Specification No. 14711 of 1888, and which is well
understood in the trade.
Referring particularly to the Figure 6—
The air leaving the chambers E travels through conduits H to the exhaust or
suction fans I and is discharged from thence.
The volume of the air passing through the sieve and through the spaces D and E
is regulated by the valves J placed in the conduits H.
Each side chamber is preferably arranged with its own air conduit and regu-
lating valve, so that each side chamber may have its air currents separately
regulated.
In a machine with one tier of two-sieves, I prefer to make four separate side
chambers and conduits, and to regulate the same with valves J, J', J³, J³, as shown
more particularly in Figure 2.

page_text: Figures 4 and 5 show the arrangements of a double machine with two tiers of
sieves and having eight separate side chambers, each with its own conduit and
regulating valve.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be perforined, I declare that what I
claim is :-
1. In a purifier, the combination of a dust depositing side or end chamber or
chambers with one or more vibrating sieves or tiers of vibrating frames and sieves,
such side or end dust depositing chamber or chambers being arranged to deposit
dust therein and to discharge the deposited dust automatically or otherwise.
2. The improved arrangement of middlings purifier with dust depositing chamber
or chambers substantially as herein described.
Dated this 1st day of March 1893.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.