Different Sizes or Specific Gravities.
Year: 1885

page_text: Different Sizes or Specific Gravities.
We, THOMAS WILLIAM BASSETT MUMFORD Manager to Messieurs James Gibbs
and Company of Victoria Docks in the County of Essex Chemical Manufacturers
and ROBERT MOODIE Engineer to the said Firm do hereby declare the nature of
said Invention for "IMPROVEMENTS IN APPARATUS FOR SEPARATING SUBSTANCES
OF DIFFERENT SIZES OR SPECIFIC GRAVITIES" 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 apparatus for separating substances of different sizes
or specific gravities especially applicable for separating the finer from the coarser
particles of crushed or ground materials and has for its object to supercede the
use of sieves and to render the settling chambers hitherto used in connection with
blowing or exhausting apparatus unnecessary whereby we are enabled to effect
economy in the room occupied by the apparatus, moreover the apparatus is so
arranged that dust is prevented or in great part prevented from entering the room
or place where the apparatus is situated. An apparatus constructed according to
our Invention consists of a casing in which is enclosed a fan in proximity to a
number of contracted passages which may be formed by louvres giving between
them passages inclined upwards towards the fan. Beneath these are receptacles or
guides to receptacles so placed as to receive each a portion of the material treated
of a different degree of fineness from that received by the other or others of the
receptacles or guides. The matter to be treated is fed into the apparatus and on
the fan being rotated the currents of air created thereby through the passages in
proximity thereto cause the separation of the finer from the coarser portions, the
latter falling into one receptacle and the finer being carried forward by the air
currents and eventually falling into the other or others of the receptacles. It is
preferred that the matter to be treated shall be fed into the apparatus through
a receiver revolving with the fan and having openings in its sides through which
the material is ejected so as to strike against a surface arranged opposite thereto
the said material thereafter descending and being acted upon by the air currents
D. 037

page_text: as herein before explained. A circulation of the air currents is obtained by deflecting
plates with a space between them beneath the fan and the contracted passages and
the force of the air currents and consequently the degress of fineness into which the
materials are separated can be regulated by adjusting the relative positions of the
said deflecting plates or the louvres or their equivalents so as to contract or widen
the spaces or passages between them.
The circulation of the air currents being maintained within the casing enclosing
the operating parts the dissemination of dust in the room or place where the
apparatus is situated is prevented.

page_text: Different Sizes or Specific Gravities,
We THOMAS WILLIAM BASSETT MUMFORD Manager to Messrs James Gibbs & Co
of Victoria Docks in the County of Essex Chemical Manufacturers and ROBERT
MOODIE Engineer to the said firm 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 apparatus for separating substances of different sizes
or specific gravities especially applicable for separating the finer from the coarser
particles of crushed or ground materials and has for its object to supersede the
use of sieves and to render the settling chambers hitherto used in connection
with blowing or exhausting apparatus unnecessary whereby we are enabled to
effect economy in the room occupied by the apparatus. Moreover the apparatus
is so arranged that dust is prevented or in great part prevented from entering the
room or place where the apparatus is situated. An apparatus constructed according
to our Invention consists of a casing in which is enclosed a fan in proximity to a
number of contracted passages which may be formed by louvres giving between
them passages inclined upwards towards the fan Beneath these are receptacles or
guides to receptacles so placed as to receive each a portion of the material treated
of a different degree of fineness from that received by the other or others of the
receptacles or guides. The matter to be treated is fed into the apparatus and on
the fan being rotated the currents or circulation of air created thereby through the
passages in proximity thereto cause or causes the separation of the finer from the
coarser portions, the latter falling into one receptacle and the finer being carried
forward by the air currents and eventually falling into the other or others of the
receptacles. It is preferred that the matter to be treated shall be fed into the
apparatus through a receiver revolving with the fan and having openings in its
sides through which the material is ejected so as to strike against a surface arranged
opposite thereto, the said material thereafter descending and being acted upon by
the air currents as hereinbefore explained. A circulation of the air currents is
obtained by deflecting plates with a space between them beneath the fan and the
contracted passages and the force of the air currents and consequently the degrees
of fineness into which the materials are separated can be regulated by adjusting
the relative positions of the said deflecting plates on the louvres or their equivalents
so as to contract or widen the spaces or passages between them. The circulation
of the air currents being maintained within the casing enclosing the operating
parts, the dissemination of dust in the room or place where the apparatus is situated
is prevented.
And in order that our said Invention may be fully understood we shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed Sheet of Drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 is a vertical Section and figure 2 is a horizontal Section (taken on the
line 1, 2 (Figure 1 of an apparatus constructed according to this Invention. A is
a casing, at the upper part of which is a feeding hopper B through which passes

page_text: -
the shaft C of the fan D formed by the boss C2 disc d and the blades d-The
shaft C is mounted in bearings on the casting E carried by the casing A and is
provided with a pulley c, by which it is driven from any suitable motor. The lower
part of the shaft C, is formed with a flange or disc C³ beneath the lower opening
of the hopper, the exit for the material from the hopper being at the side between
bars F, forming the connection between the disc C3 and the boss C-A hood or
guard G is fixed opposite the bars F, its depending rim G forming a surface
against which the material under treatment impinges after it has passed between
the bars f. Beneath the fan D is a shoot H surmounted by an upper hood I forming
a passage between itself and the upper part of the shoot H.-h is a casing by which
the capacity of this passage can be regulated by raising or lowering the lever h³
connected by links ³ to the casing h. The lower part of the shoot H terminates
in an outlet spout and valve h-The lower part of the casing A forms 21 similar
shoot A and terminates in a similar spout and valve a. Supported upon the top
of the hood I over the central opening therein, are louvres J having spaces between
them as shewn. When the apparatus is in operation the material to be divided is
fed into the hopper B, and the fan D and its adjuncts being rotated. a continuous
current or circulation of air is created within the casing A. The matter under
treatment falls from the hopper B and is projected through the spaces between the
bars F against the rim g of the hood or guard G and thence descends upon
the louvres J, the heavier portions falling into the shoot H, and passing from
the apparatus through the spout thereof, the current of air separating the finer
portions and carrying them through the spaces between the louvres J and between
the fan blades d' so that the said finer portions fall into the shoot A' and leave the
apparatus through the spout thereof. Owing to the circulation of air being main-
tained within the casing A practically no dust is created in the room or place
wherein the apparatus is situated. We do not limit ourselves to the precise
details and relative positions of the parts shewn in the drawings as they may be
considerably varied without departing from the nature of our Invention, for
example, the fan may be inside the contracted spaces between the louvres or their
equivalents, the matter to be treated being fed at the outside of the fan and of
these spaces, the operation of the fan under the latter arrangement would be to
blow the finer particles outside the descending stream of matter under treatment
only the circulating current of air passing through the fan itself, whereas in the
former case the finer particles separated pass with the current of air through the
blades of the fan.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
First. In apparatus for separating substances of different sizes or specific
gravities, the combination of a fau in proximity to contracted spaces and enclosed
in a casing within which a circulation or current of air is created by the fan so as
to separate the finer or lighter from the coarser or heavier portions of the substances
and cause them to be déposited separately substantially as herein before described: '
Second. The arrangement and combination of parts constituting the apparatus
for separating substances of different sizes or specific gravities substantially 'as
herein before described and illustrated in the accompanying Drawings.
Duted this 21st day of October 1905