Improvements in Ore-concentrating Machinery.
Year: 1889

page_text: Date of Application, 14th May, 1889-Accepted, 6th July, 1889
COMPLETE SPECIFICATION.
Improvements in Ore-concentrating Machinery.
SAMUEL HENRY STEPHENS Bridge, Illogan Cornwall Tin Dresser do hereby declare
the nature of this invention and in what manner the same is to bo performed,
to be particularly described and ascertained in and by the following statement :-
This invention refers to improvements in the Ore-concentrating Machinery
described in the Specification of Letters Patent granted to Samuel Henry Stephens of
Grass Valley, California, bearing date the 28th day of May 1870 and numbered
1561.
My invention refers,
Firstly To an improved circular double receiver.
Secondly-To an improved stationary, circular inclined or convex distributing table
with any preferable number of distributing divisions or heads.
Thirdly To an improved circular, double-concentrating, revolving inclined or
convex table.
According to the first part of my invention I form the improved circular double
receiver, with two divisions, the larger division to receive the pulp or ore mixed with
water & the smaller division to receive clear water for cleansing purposes only &
each division to have a sufficient number of distributing branch pipes.
According to the second part of my invention I form the stationary, circular,
inclined or convex, distributing table into any preferable number of small divisions
or heads, each division or head to receive the pulp or ore mixed with water, by means
of a pipe leading from the circular double receiver so as to ensure the more equal
distribution on the concentrating table.
According to the third part of my invention I form the circular, double concen-
trating, revolving, inclined or convex table with two shelves or steps. The first shelf
or step is nearest & a little below the stationary distributing table and receives the
pulp or Ore mixed with water equally on its inside edge from each of the distributing
divisions or heads. On this shelf or step the finest & richest part of the Ore is concen-
trated & classified until it is by means of the revolving brush & jet of clear water
washed off into a separate launder or receiver. The second or outer shelf or step is placed
a little below the inside one & receives the coarsest & poorest part of the pulp or Ore.
which passes over the inside shelf or step for a different classification & is then
washed by means of another revolving brush & jet of clear water into a suitable
receptacle.
In order that my said invention may be most fully understood & readily carried
into effect I will proceed to describe the same with reference to the Drawings hereunto
annexed.
Fig. 1. is a vertical cross section of an Ore-concentrator constructed according to
my invention for the purpose of concentrating & classifying, Tin & other Ores.
Fig. 2 is a plan of the same. The circular double concentrating revolving, convex
table, A. with its two shelves or steps b. & c. is supported on wooden arms D. D.
the ends of which are securely fixed into an iron centre E. the whole being made to revolve
around the upright fixed shaft F. by means of bevil gear G. attached to the under
part of the wooden arms D. D. The table is further supported on iron rollers H. H.
placed at convenient distances & in suitable frames. The circular distributing convex
table i. with its divisions or heads J. J. is securely fixed to the upright fixed shaft F.
at a convenient distance above the revolving table A. The circular double receiver K.
is also fixed at the top of the same upright fixed shaft F. The general operation of the
machine is as follows. The material to be concentrated & classified is delivered by
a suitable launder M. into the larger division L of the circular double receiver K.

page_text: mixed with. water & allowed to pass to the several divisions or heads of the fixed
circular distributing table I. by the several branch pipes N. N. While the materia..
is being fed to several divisions or heads & evenly distributed, the Ore or valuable
portion by its specific gravity settles upon the inside shelf or step b. of the revolving
concentrating table A. where it is further cleansed & purified by jets of clear water
conveyed by the branch pipes N. N. from the smaller division O. of the circular
double receiver K. & is carried around until it comes into contact with the revolving
brush P. & jet of clear water & washed off into a suitable receptacle. The coarser
or poorer portion of the material washed over this inside shelf or step b. on to the
outer or narrower shelf or step c. where it is further classified & the best quality
washed off by means of a revolving brush R. & jet of clear water similar to the other
case into a suitable receiver.
my said
Having now particularly. described & ascertained the nature of
Invention & in what manner the same is to be performed, I declare that what
I claim is,
First An improved circular double receiver, substantially as described & for the
purpose set forth in Drawings 1 & 2.
Second An improved stationary, circular, inclined or convex distributing table
with any preferable number of distributing divisions or heads substantially as described
& as shewn in Drawings 1 & 2.
Third An improved circular, double concentrating revolving, inclined or convex
table, substantially as described & for the purpose set forth in Drawings 1 & 2.
In witness whereof I the said Samuel Henry Stephens have hereunto set my hand
& seal this 13th day of May in the year of our Lord, One thousand eight hundred
& eighty-nine.
SAMUEL HENRY STEPHENS,
Bridge, Illogan, Cornwall.