Improvements in Sieves suitable for Use in Mills for Treating Mineral Ores.
Year: 1888

page_text: Date of Application, 6th July, 1888
Complete Specification Left, 8th Apr., 1889-Accepted, 15th June, 1889°
PROVISIONAL SPECIFICATION.
Improvements in Sieves suitable for Use in Mills for Treating Mineral
Ores.
.
1, CHARLES WALTER KITTO of 178 Larkhall Lane, Clapham, in the: County of
Surrey, Manager of Works do hereby declare the nature of this invention to be as
follows:-
This invention has reference to the construction of sieves of wire gauze or similar
material suitable for use in mills for treating mineral ores and for other purposes of a
corrugated or undulated form in such a manner as to increase the area of the sieve
whilst at the same time imparting the necessary strength. According to one
construction the corrugations are flattened at the edges into a series of folds that may
be held between suitable plates or bars forming a frame and a sieve may be formed
with any required number of pieces of wire gauze or the like, corrugated and mounted
in suitable framework as required.
D
L
1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sieves suitable for Use in Mills for Treating Mineral
Ores.
+
I, CHARLES WALTER KITTO, late of 178, Larkhall Lane, Clapham, in the County of
Surrey now of 60, Mall Road, Hammersmith, in the County of Middlesex, Manager
of Works, 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 has reference to the construction of metal sieves of perforated or
reticulated material suitable for use in mills for treating mineral ores, of a corrugated
or undulated form in such a manner as to increase the area of the sieve, whilst at the
same time imparting the necessary strength. According to one construction the
corrugations are flattened at the edges into a series of folds that may be held between
suitable plates or bars forming a frame and a sieve may be formed with any required
number of pieces of perforated sheet metal or the like corrugated and mounted in
suitable frame work as required.
•
In the accompanying sheet of drawings
Fig. 1 is a face view; and
Fig. 2 a transverse section of part of a sieve constructed according to this invention
held within a frame and adapted for use with an ore crushing mill.
Figs. 3 & 4 are similar views to Figs. 1 & 2 illustrating a modified construction of
frame for the sieve.
Fig. 3 is a section on the line a b Fig. 3.
Figs. 5, 6, 7 & 8 are face views of various forms of corrugated sieves mounted in
frames and adapted for use in mills of different forms.
Figs. 9 & 10 are respectively a vertical section, and a side elevation, of part of a
mortar with stamp having a corrugated sieve constructed according to this invention
applied to one side thereof.
The sieve shown in Figs. 1 & 2 is constructed of perforated sheet metal 1 that is
corrugated as shown, in order to present a large effective screening area, and to impart

page_text: sufficient strength to the sieve to withstand the force of material to be sieved or
screened when such material is thrown against it, as for example in the case of a
mortar with stamp. In order to prevent oxidation and consequent rapid destruction
of the metallic sieve, which would under ordinary circumstances take place when it is
applied to wet mills, it is, subjected to, any suitable process for causing it to resist
oxidation. The perforations in the plate 1 may advantageously be made of conoidal
form so that when the sieve is applied to a mill with the smaller ends of the holes
inward or towards the material to be sieved or screened the liability of the holes being
clogged or stopped up will be reduced to a minimum: The corrugations of, 'the
perforated plate 1 are flattened at the edges or sides as shown at 2, and at the ends of
the plate and to one or to both sides of these flattened parts is secured a frame of
any suitable material such as wood, or india rubber. In Fig. 2 a frame 3 of wood is
shown applied to one side of the plate, and a frame 4 of yielding or elastic material,
such as india-rubber to the other side.
"
In Figs. 3, 3 & 4 the corrugated perforated plate instead of being flattened
at its sides and ends, as in Figs. 1 & 2 has its corrugations extending across, the whole
width of the plate and the adjacent sides of the frames 3; 4 are correspondingly
corrugated to fit the plate as shown in Fig. 3ª.
".. ij
Corrugated sieves constructed with a frame or frames in the manner described may
be readily secured in position to a mortar with stamp, such, for example
as that
shown in Figs. 9 & 10, or to other ore crushing mills, with a water tight joint between
it and the mill and with an absence of pockets or chambers for the lodgment of crushed
or ground material.
By the use of sieves constructed as hereinbefore described with dry and wet ore
crushing mills, the difficulty hitherto experienced in getting rid of the crushed or
ground material is to a large extent obviated, as a largely increased screening area is
provided.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that
what I claim is :-
ל
The construction and use of sieves for mills substantially as herein described and
illustrated by the accompanying drawings.
"Dated this 8th day of April 1889.