Improvements in Apparatus for Separating Substances of Different Sizes or Specific Gravities.
Year: 1896

page_text: Date of Application, 27th July, 1896-Accepted, 31st Oct.. 1896
COMPLETE SPECIFICATION.
Improvements in Apparatus for Separating Substances of Different
Sizes or Specific Gravities.
We, WILLIAM JOHNSON and HARRY WALKER, of the Castleton Foundry,
Armley, Leeds, in the County of York, Engineers, 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 and is specially applicable to apparatus for separating the finer
from the coarser particles of crushed, or ground, minerals and the like. We will
describe our invention with reference to the accompanying drawings, Figures 1
and 2 of which represent in sectional elevation at right angles to each other a
separating apparatus constructed according to my invention.
The apparatus consists of a casing A containing a fan B, preferably of the
"Blackman" type, arranged to rotate in a vertical plane or approximately so, the
spindle C, of the fan being mounted in bearings a in, or attached to, the casing A.
The casing A is separated by a partition A2 into chambers or compartments, D,
and E, a circular opening being provided in the said partition A in which opening
the fan B rotates. The chambers, or compartments, D and E, terminate at their
lower ends in contracted outlet passages d, and e, respectively for the separated
material. The material to be separated is fed into a hopper F, opening into the
upper part of the chamber, or compartment D, the material passing through the
said hopper on to an inclined fixed or moveable sieve, or riddle, G, through which
the finer particles pass while the material which will not pass through the said
fixed or moveable sieve or riddle is conducted thereby through a shute or spout, H,
out from the apparatus. The fan B, being rotated in the direction indicated by
the arrow in Figure 2 acts as an exhauster to assist the passage of the material
through the said fixed or moveable sieve or riddle falling to the bottom of the
chamber, or compartment, D, and out from the apparatus through the contracted
outlet d whilst the lighter particles are drawn by the fan into the chamber, or
compartment, E, and pass therefrom through the contracted outlet passage e. In
the partition A is an opening I closable by a valve, or shutter, K, capable of
being operated by a handle k outside the casing A. When this valve, or shutter,
is open, communication is made through the opening I between the chambers D
and E so that any of the lighter particles which may escape the first action of the
fan and pass partly down the chamber, or compartment, D, will be drawn into the
chamber, or compartment, E, through the said opening I and pass therefrom
through the outlet e.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In apparatus for separating substances of different sizes, or specific gravities,
the combination of a sieve, or riddle, by which the coarser particles are separated
from the finer particles, and a fan, or exhauster, by which the portions of material
which pass through the sieve or riddle are acted upon so that the lighter particles
thereof are separated from the heavier particles thereof substantially as herein-
before described.

page_text: 2. The combination and arrangement of parts constituting the apparatus for
separating substances of different sizes, or specific gravities, as hereinbefore
described and illustrated in Figs. 1 and 2 of the accompanying drawings.
Dated this Twenty-fifth day of July 1896.
WILLIAM JOHNSON.
HARRY WALKER.