Improvements in Purifiers for Middlings and such like Cereal Products.
Year: 1891

page_text: Date of Application, 22nd July, 1891
Complete Specification Left, 18th May, 1892-Accepted. 18th June, 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by HENRY SIMON, of Brieg, Switzerland, Civil
Engineer.]
Improvements in Purifiers for Middlings and such like Cereal
Products.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Fellow of the Institute of Patent Agents, do hereby declare
the nature of this invention to be as follows :—
This invention relates to purifiers for middlings and such like cereal products, so
constructed and arranged that the air which by means of a fan is forced or drawn
through them, is discharged free from dust. For this purpose, the silk or per-
forated part of the shaking sieve is made narrow so as to occupy only the middle of
the sieve, leaving on each side a recess extending along the whole length of the sieve,
into which recess are delivered the dust and fine particles from the transverse sloping
channels which are arranged as a grid a little above the silk as described in the
Specification No. 5155 of 1884. At some distance above the grid there is a
horizontal deflector with two sides extending above it forming a central recess in
which collect dust and fine particles dropping from the air ascending on each side
of it, and in this recess there is a worm conveyor or a set of travelling brushes
moving the deposited matter to a delivery shoot at one end of the machine.
The space above this recess is divided into several chambers each communicating
by a passage furnished with a slide or other valve with the suction of a fan. The
air, ascending past the central recess, enters from each side these chambers and
deposits therein such of the dust and fine particles as still remain suspended in it,
the deposited matter sliding down the sloping sides of the chambers into the recess,
to be conveyed away. The lateral opening into each chamber at each side may be
one large opening or may consist of a number of openings between sloping
bars which may be of trough section, care being taken that on the way to the
valve outlet there is no contraction of area such as might tend to accelerate the air
currents.
The recess with conveyor and depositing chambers above referred to may be
arranged above sieves of various forms and arrangements with grids of channels
or other appliances for receiving deposit, either oscillating with them or stationary
and automatically cleared by travelling brushes or otherwise.
In order to prevent air from entering over the tail of the sieve by the shoot for
discharging the tailings, or from entering by the shoots which discharge the
deposited matters, these shoots are provided with lightly hung valves which open
to allow egress of the solid matters but close against ingress of air. Instead of
such valves for the deposit shoots, or in addition to them, the shoots are made to

page_text: terminate in horizontal channels with worm conveyors working in them, but so
that there is always a heap of the moving material which prevents ingress of air.
Dated this 21st day of July 1891.
ABEL & IMRAY,
Agents for the Applicant,
Improvements in Purifiers for Middlings and such like Cereal
Products.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane in the
County of London, Chartered Patent Agent, 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 purifiers for middlings and such like cereal products, so
constructed and arranged that the air which by means of a fan is forced or drawn
through them is discharged free from dust. For this purpose the purifier is
constructed and arranged as I shall describe referring to the accompanying
drawings.
Fig. 1 is a longitudinal section and Fig. 1ª is a part longitudinal section shewing
a modification at the end.
Figs. 2, 3 and 4 are transverse sections on the lines XX, Y Y and Z Z of Fig. 1
respectively.
The silk or perforated portion a of the shaking sieve is made comparatively
narrow, leaving on each side of it a recess 6 extending along the whole length of
the sieve. Into these recesses are delivered the dust and fine particles from the
transverse sloping channels c which are arranged as a grid a little above the silk a.
At some distance above the grid c there is a horizontal deflector d with two sides
extending above it, forming between them a central recess in which collect dust
and fine particles dropping from the air ascending on each side of the deflector,
and in this recess there is a worm conveyor e or it might be a set of travelling
brushes moving the deposited matter to a delivery shoot at the end. The space
above the deflector d and its recess is divided by partitions into several chambers g
each communicating by a passage h furnished with a slide or other valve with the
suction channel of a fan i. The air ascending from the sieve past the deflector d
onters the chambers 9 by openings at each side and deposits therein such of the
dust and fine particles as still remain suspended in the air, the deposited matters
sliding down the sloping sides of the chambers 9 into the central recess to be
conveyed away. The lateral openings / may be of various shapes and may be
more or less divided by sloping bars. Care, however, is always to be taken that
from the sieve a on the way to the valve outlets there shall be no contraction of
area such as might tend to accelerate the air currents.
In order to prevent air from entering over the tail of the sieve a by the shoot
for discharge of the tailings this shoot may be provided as shewn in Fig. 1 with a
lightly hung valve m which opens outwards allowing egress of the solid matter
which has to be more or less heaped against the valve to force it open. When the
discharge shoot opens into a closed channel which may have a worm or other
conveyor n as shewn in Fig. 14 the valve m may be dispensed with, or as shewn in
the figure both the valve and the closed channel may be used in combination. In
like manner such other shoots as may be necessary to discharge deposited matters
may open into closed channels and may be provided with valves such as m to
prevent access of air.
Deflectors and depositing chambers such as are above described may be combined
in purifiers with various arrangements of sieves with or without lateral recesses

page_text: and with grids of channels or other known appliances for receiving deposits from
the air currents.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that I make
no claim to a sieve with side deposit or collecting passages nor to a central
deflector with outwardly sloping sides and a conveyor in it or a deposit chamber
over the silk cloth provided with apparatus for continuously discharging, but what
I claim is :-
In a purifier, in combination with the sieve and with recesses, grids of channels,
or other appliances for collecting deposit, a central deflector situated at some
distance above the sieve and made with inwardly sloping sides guiding the air
currents through large passages into depositing chambers which communicate by
adjustable openings with the suction channel of the fan, substantially as and for
the purpose set forth.
ABEL & IMRAY,
Agents for the Applicant.