Improvements in Screens or Sieves for use in Stamp-batteries and otherwise for the Separation of Ore and other substances.
Year: 1892

page_text: Date of Application, 19th Feb., 1892
Complete Specification Left, 19th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Screens or Sieves for use in Stamp-batteries and
otherwise for the Separation of Ore and other substances.
I, CHARLES RALEIGH, of Johannesburg, in the South African Republic,
Milling Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention consists of improvements in screens or sieves for separating the
finer portion of crushed gold ore and other substances from the coarser portion.
Ordinary screens or sieves have all the apertures or perforations in the same
plane. The consequence is that the crushed substance, in striking the screen or
sieve obliquely, glances from the surface thereof without the proper or desired
proportion passing through.
The principal object of the present invention is to prevent the crushed substance
from glancing off in the manner stated, and this I accomplish by corrugating or
embossing the screen or sieve; that is, I bend the material containing the apertures
or perforations into alternate ridges and furrows.
I prefer to form the screens or sieves from wire gauze made of fine wires with
coarser strengthening wires interwoven, but perforated metal plates may be
employed.
•
In cross section, the ridges or furrows should be curvilinear, but they may be
rectilinear, or partly curvilinear and partly rectilinear.
The corrugated screen or sieve may be mounted in a bipart frame, each half of
which is corrugated so as to correspond with the other half and with the screen or
sieve, which lies between the two halves; the latter being held together by bolts
and nuts. The bipart frame may be lined with cloth or other fabric; or, in the
case of a wire screen or sieve, the cloth or other fabric may be interwoven in the
margins of the material.
Dated the 18th day of February 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Screens or Sieves for use in Stamp-batteries and
otherwise for the Separation of Ore and other substances.
I, CHARLES RALEIGH, of Johannesburg, in the South African Republic,
Milling Engineer, 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 consists of improvements in screens or sieves for separating the
finer portion of crushed gold ore and other substances from the coarser portion.
Screens or sieves as ordinarily constructed have all the apertures or perforations
in the same plane. The consequence is that a large proportion of the crushed or
other material under treatment, striking the screen or sieve obliquely, glances off
or rebounds from the screening surface instead of passing through.
The principal object of the present invention is to obviate the tendency of the
material under treatment to glance off in the manner above alluded to; and this
I accomplish by corrugating or embossing the screen or sieve; that is, I bend,
stamp or otherwise form the material composing the sieve so as to present a series
of prominences and depressions, such for example as alternate ridges and furrows.
DQ77

page_text: In the accompanying drawings, Fig. 1 is a plan of a screen or sieve embodying
my invention; Fig. 2 being a corresponding longitudinal vertical section.
I prefer to form the screens or sieves from wire gauze made of fine wires a with
coarser strengthening wires a' interwoven, but perforated metal plates may be
employed.
In cross section, the prominences and depressions or ridges and furrows are
preferably curvilinear and resemble those of corrugated sheet iron; but they may
be rectilinear, or partly curvilinear and partly rectilinear.
The corrugated screen or sieve may be mounted in a bipart frame A A¹, each
half A or A of which is corrugated so as to correspond with the other half and
with the screen or sieve a a¹, which lies between the two halves. The latter may
be held together by bolts b and nuts 6. The bolts and nuts are not, however,
essential, as the two halves A and A¹ can be firmly secured in position by wedges
driven between them and that part of the mortar-box in which the screen or sieve
is placed. The bipart frame A A' may be lined with cloth or other fabric; or, in
the case of a wire screen or sieve, the cloth or other fabric may be sewn or
otherwise attached to the margins of the material a a'; or one or more stout threads
of jute, flax or equivalent material may be interwoven therewith to serve as packing.
A layer of cloth c or other packing material is glued or cemented to the top of the
part A.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim :-
:-
1. For use in stamp-batteries and otherwise for the separation of ore and other
substances, the improved construction of screen or sieve in which the wire gauze
or perforated plate employed for screening is corrugated or formed with numerous
prominences and depressions, whereby, in addition to the screening area being
increased, the tendency of the substance under treatment to glance off, instead of
to pass through, is greatly diminished.
2. For use in stamp-batteries and otherwise for the separation of ore and other
substances, the improved screen or sieve consisting of a corrugated sheet of wire
gauze or perforated plate, packed and held in a bipart frame A A', substantially as
herein described.
3. In screens or sieves for use in stamp-batteries and otherwise for the separation
of ore and other substances, providing the gauze screen with threads or strips of
jute, flax or other packing material woven in or similarly attached to the
margins to be covered by the sieve-frame.
Dated this 22nd day of February 1892
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.