Improvements in Crushing Mills.
Year: 1892

page_text: Date of Application, 18th Feb., 1892
Complete Specification Left, 18th Nov., 1892-Accepted, 31st Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Crushing Mills.
We, EDWARD JONES, of 206, Gresham House, Old Broad Street, in the City
of London, Mining Engineer, and WILLIAM HORNSBY, of Spittlegate Iron
Works, Grantham, in the County of Lincoln, Engineer, do hereby declare the
nature of this invention to be as follows:
:-
.
Our invention relates to mills chiefly designed for crushing quartz and of the
kind in which a series of heavy balls is employed.
In carrying out our invention we employ a circular pan having at the bottom an
annular path upon which the crushing balls run. The balls are caused to travel
upon the annular path by means of arms attached to a central shaft placed
vertically in the centre of the pan and driven by suitable gearing, the said arms
being placed behind the balls to push them as the shaft revolves. Inside the
annular path is a trough for containing the mercury. Over the top of this mercury
trough is a disc connected to the central shaft so as to revolve therewith and onto
which the material to be crushed is delivered, so that it will be thrown by
centrifugal action into the annular path beneath the crushing balls. At the bottom
of the mercury trough is a water inlet for the admission of water into the pan,
water rising through the mercury. The sides of the pan above the annular path
are provided with screens or sieves through which the light portions of the crushed
material are carried by the water.
the
We sometimes make the vertical spindle and the arms hollow and pass water
therethrough, the outlets at the ends of the arms being so placed that the jets of
water issuing therefrom tend to drive the balls and thus relieve the friction between
the arms and the said balls. In some cases also we find it advantageous to place
anti-friction balls or rollers at those parts of the arms which come in contact with
the crushing balls.
The balls are preferably made hollow and filled with lead.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Crushing Mills.
We, EDWARD JONES, of 206, Gresham House, Old Broad Street, in the City
of London, Mining Engineer, and WILLIAM HORNSBY, of Spittlegate Iron Works,
Grantham, in the County of Lincoln, 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 :-
Our invention relates to mills chiefly designed for crushing quartz and of the
kind in which a series of heavy balls is employed.
In the accompanying drawings,
Figure 1 is an elevation of our improved crushing mill :
Figure 2 is a section of the same on the line xx, Figure 1; and,
Figure 3 is a plan with the top portion and cover removed.
In carrying out our invention we employ a circular pan a mounted on a suitable
frame b and having at the bottom an annular path c upon which the crushing
balls d run and which are preferably made hollow and filled with lead. The said
balls are caused to travel upon this annular path by means of arms e, e attached to a

page_text: central shaft fpassing up vertically through a bearing g in the centre of the pan
and driven by suitable gearing such as the bevel-wheels h, from a shaft i, the
said arms being placed behind the balls to push them as the shaft revolves. Inside
the annular path c is a trough j for containing mercury. Over the top of this
mercury trough is a disc k surrounding the bearing g and connected to the central
shaft so as to revolve therewith, the said disc being of slightly less diameter than
the trough so as to leave a space k¹ through which the precious metals enter the
said trough. The material to be crushed is delivered onto this disc so that it
will be thrown by centrifugal action into the annular path e beneath the crushing'
balls d. d.
To the bottom of the bottom of the mercury trough is connected a pipe / for the
admission of water, the water rising through the mercury in the trough j, thence
passing through the space k' into the pan, and thence escaping through screens m, m
in the sides of the pan above the annular path, thereby carrying off the gangue or
other impurities. Around the outside of the pan is an inclined channel n into
which the water and impurities passing through the screens m, m are discharged.
A second pipe o is also attached to the bottom of the trough ; and serves for
drawing off the amalgam therefrom.
We sometimes make the vertical spindle and the arms hollow, as indicated by the
dotted lines p, p in Figures 2 and 3, and pass water therethrough, the outlets at
the ends of the arms being so placed that the jets of water issuing therefrom tend
to drive the balls and thus relieve the friction between the arms and the said balls.
In some cases also we find it advantageous to place anti-friction balls or rollers at
those parts of the arms which come in contact with the crushing balls.
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 a crushing mill of the kind hereinbefore referred to, the combination with
the balls of a series of arms for imparting motion to the said balls, substantially as
described.
2. In a crushing mill having a series of balls driven by arms as referred to in the
preceding claiming clause making the said arms hollow, substantially as, and for
the purpose, described.
3. The manufacture and use of the improved crushing mill consisting of the
parts constructed and combined substantially in the manner hereinbefore described
and illustrated in the accompanying drawings and operating as, and for the purpose,
set forth.
D
11
1
han 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.