Improvements in Magnetic Separators.
Year: 1894

page_text: Date of Application, 14th Mar., 1894
Complete Specification Left, 13th Dec., 1894-Accepted, 19th Jan., 1895
Improvements in Magnetic Separators.
I, SEPTIMUS LEONARD ANDERSON 123, Upper Hanover Street, in the City
of Sheffield, Electrician do hereby declare the nature of my invention to be
as follows:-
This invention has for its object to increase the efficiency of magnetic separators,
or machines for separating magnetic substances from non-magnetic substances with
which they may be mixed.
It is well adapted to rotary separators (for example) in which the mixed materials
are passed through an inclined barrel, the interior being provided with a number of
longitudinally placed magnetic pole pieces.
It consists in forming simple or compound projections from the sides of the
pole pieces, extending upon the intermediate space and towards the adjacent
pole piece.
I prefer that these projections shall be interjacent with those of the next pole
piece, that is pointing between those of the opposite set.
The number of projections and the amount of their extension may be varied,
but I prefer that it shall be more than half across the space between the pole pieces,
so that there shall not be a central longitudinal path between the pole pieces which
is not traversed by the said projections; thus it will be impossible for any substance
pass down the barrel without coming in contact with one or more of the magnetic
poles or the projections therefrom.
to
By this novel arrangement I decrease the resistance in the magnetic current, and
increase the magnetic lines of force..
Dated the 12th law of March 1804
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Magnetic Separators.
I, SEPTIMUS LEONARD ANDERSON 123, Upper Hanover Street, in the City
of Sheffield, Electrician, do hereby declare the nature of this invention and in what
manner the same has to be performed, to be particularly described and ascertained in
and by the following statement :-
This invention has for its object to increase the efficiency of magnetic separators,
or machines used for separating magnetic substances, as for instance iron or steel
or other substances capable of attraction by a magnet, from non magnetic substances
with which they may be mixed.
To enable my invention to be clearly understood I annex a sheet of drawings
illustrating same, similar letters indicate similar parts in any of the figures.
Fig. 1, is an end elevation of the separator cylinder with the end plate removed to
show the magnets.
Fig. 2, side and end views of ordinary magnets detached.
Fig. 3, plan of a portion of the face of magnets, or pole pieces with my extensions
as preferably made.

page_text: In carrying out my invention with the object of increasing the efficiency of
the separator, by decreasing the magnetic resistance, and increasing the field
of attraction in a rotary separator for example, the cylinder of which is illustrated
in Fig. 1.
O, being the outside or periphery, C, the inner cylinder through which the material
is passed to be operated upon, it being understood that the cylinder is either fixed
in an inclined position or the inside cylinder may be coned so that any material fed
in at one end will be gravitation aided by rotary motion gradually pass out at the
other end.
A number of magnets M, are fixed between the periphery O, and the cylinder C,
with their faces or pole pieces P, either flush with or projecting beyond the
cylinder C.
They are usually made shorter than the cylinder and resemble a series of
straight bars placed longitudinally in the cylinder, and have therefore longitudinal
spaces I, between them from end to end. As the material passes through the
cylinders the magnets pick up all bits of substance that are subject to magnetic
influence, such as iron and steel that come within range of such attraction, but it is
found in practice that owing to the spaces I, before mentioned, a percentage of such
substances escapes. I therefore construct the pole pieces P, of such magnets M,
with simple or compound projections S, extending from the sides of the pole pieces P,
into the intermediate space I.
The simple projections are shown in Figs. 3, and 4, and a compound projection
in Fig. 5.
The simple projections may extend towards each other as in Fig. 4, or may pass
beyond the ends of the opposite projections as in Fig. 3, or if desirable any form of
compound extension may be used, for example that shown in Fig. 5.
The simple projections may extend towards each other" as in Fig. 4, or may
pass beyond the ends of the opposite projections as in Fig. 3, or if desirable any
form of compound extension may be used, for example that shown in Fig. 5.
I prefer that these projections shall be interjacent and equidistant with those
upon the adjacent pole piece as shown in Figs. 3, 4, 5, but not necessarily so.
By this arrangement of extensions from the longitudinal pole pieces, the space I,
is crossed or barred, and passing magnetic substances are caught and retained, and
are carried up by the revolving cylinder in the usual manner.
The magnetic resistance is also decreased, and the magnetic field is increased in
power
"
Although I have described my improvements as applied to a cylindrical separator
only they may be applied to other forms of separators, such for example as those
having a vibratory action..
Having now particularly described and ascertained the nature of my. inven-
tion, and in what manner the same is to be performed, I'declare that what I
claim is:-
یہ
1. In magnetic. separators, constructing the pole pieces with side projections,
substantially as hereinbefore described and shown for the purpose specified.
2. The combination with a magnet M, used in magnetic separators, of simple or
compound lateral extensions S, from the pole P, for the purpose specified, as herein-
before described a
d and substantially as shown.
Dated the 11th 1
2001
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.