Improvements in Machines or Apparatus for Pulverizing or Reducing Gold Bearing Quartz or Ores or other Hard Substances.
Year: 1893

page_text: Date of Application, 28th Aug., 1893
Complete Specification Left 28th May, 1894-Accepted, 25th Aug., 1894
AL DI DUITITUATION.
Improvements in Machines or Apparatus for Pulverizing or
Reducing Gold Bearing Quartz or Ores or other Hard
Substances.
I, MIDDLETON CRAWFORD of Wiarton, Ontario, Canada, but at present
residing at the Inns of Court Hotel, Holborn in the County of London Engineer
do hereby declare the nature of this invention (which has been communicated to
me from abroad by John Thomas Crawford of Wiarton, Ontario, Canada,
Engineer) to be as follows :-
The object of this invention is to provide machines or apparatus for pulverizing
or reducing gold bearing quartz or ores or other hard substances and has more
especially for its object to provide a machine or apparatus which will act in a very
efficient manner and which is of comparatively small first cost and capable of acting
with a minimum of wear of its operating parts.
According to this invention the machine or apparatus consists of a disc
constituting a grinding path and of a roller or rollers which act in conjunction with
the said disc to effect the pulverizing or reduction of the ore or material under
treatment the said disc, and roller or rollers being each in the form of a cone or of
the frustrum of a cone so proportioned to each other that their surface speeds
throughout their meeting line are the same at any given point. The said disc, and
roller or rollers are situated in a vessel or receiver into which the material to be
acted upon is fed the said receiver or vessel having an inlet or inlets for water at or
towards its lower part and an outlet or outlets at or near its upper part for light
refuse freed from precious metal. The inlet or inlets for water is or are made
preferably through the bearing or bearings of the axis or axes of the roller or
rollers and thence by holes and a passage around each axle out by transverse holes
into the interior of the receiver or vessel. The material to be operated upon is
pulverized or reduced between the disc and roller or rollers and heavy portions or
precious metals pass downward and may be amalgamated by mercury introduced
into the lower part of the apparatus the light finely divided matter from which the
heavier portions or precious metals have been separated being carried up by the
water and out by the outlet or outlets at or towards the upper part of the receptacle
or vessel. The disc and the roller or rollers may both be positively rotated but it
is preferred to rotate the roller or rollers and cause it or them to rotate the disc,
the said disc and roller or rollers being preferably pressed together by weights or
springs adjustable to give the requisite pressure. A convenient arrangement of the
apparatus or machine according to this invention consists of a conical disc carried
by a stem mounted in bearings the stem being acted upon by a cross bar having an
upward pressure exerted by springs acting on its ends. This disc is enclosed by
the aforesaid receptacle or vessel into which project two shafts their inner ends
being provided with conical rollers which bear on the aforesaid disc the outer parts
of the shafts carrying pulleys or gearing by which they may be driven. The inlet
for the material to be operated upon enters the vessel or receptacle and the water
is admitted at the axes of the rollers as herein before described. The vessel or
receptacle is provided below the acting surfaces of the disc and rollers with an
outlet or outlets by which the heavy deposited portions or precious metals can be
drawn off as required and above there may be provided another outlet or outlets
by which heavy gangue or sludge can be removed.

page_text: It will be understood that there may be one two or more rollers acting in
conjunction with the disc.
Dated the 28th day of August 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C, Agents.
COMPLETE SPECIFICATION.
Improvements in Machines or Apparatus for Pulverizing or
Reducing Gold Bearing Quartz or Ores or other Hard
Substances.
I, MIDDLETON CRAWFORD of Wiarton, Ontario, Canada, but at the time of
my application residing at the Inns of Court Hotel Holborn in the County of
London Engineer do hereby declare the nature of this invention (which has been
communicated to me from abroad by John Thomas Crawford of Wiarton, Ontario,
Canada Engineer) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
The object of this invention is to provide machines, or apparatus, for pulverizing,
or reducing, gold bearing quartz, or ores, or other hard substances; and has more
especially for its object to provide a machine, or apparatus, which will act in a very
efficient manner, and which is of comparatively small first cost, and capable of acting
with a minimum of wear of its operating parts.
I will describe the invention with reference to the accompanying drawing.
Figure 1 is a vertical section Figure 2 an end elevation and Figure 3 a plan of a
machine made in accordance with this invention.
Figures 4 and 5 shew (drawn to a larger scale) detail views of the arrangements
for admitting water to the apparatus.
The machine, or apparatus, consists of a disc A, constituting a conical grinding
path, and of rollers B, which act, in conjunction with the said disc A, to effect the
pulverizing, or reduction, of the ore, or material, under treatment; the said disc A,
and rollers B, being each conical or in the form of the frustrum of a cone, so
proportioned to each other that their surface speeds throughout their meeting line
are the same at any given point. The said disc A, and rollers B, are situated in a
vessel, or receiver, C, into which the material to be acted upon is fed by any
suitable means, the said receiver or vessel, C, having an inlet, or inlets, for water,
at, or towards, its lower part, and an outlet, or outlets, at, or near, its upper part, for
light refuse which has been freed from precious metal.
The inlet, or inlets, for water, is, or are, made, preferably, through the bearing,
or bearings, of the axis, or axes, of the disc A, and rollers B, by the pipes d, and
passages d², and thence, by a passage d³, around each axle, out by an opening, or
holes, d' into the interior of the receiver or vessel C as shewn clearly in Figures 4
and 5. The material to be operated upon is pulverized, or reduced, between the
disc A, and rollers B, and heavy portions, or precious metals, pass downward, and
may be amalgamated by mercury introduced into the lower part of the apparatus,
the light finely divided matter, from which the heavier portions, or precious metals,
have been separated, being carried up by the water, and out by an outlet, or by
outlets, at, or towards, the upper part of the receptacle, or vessel C. The disc A,
and rollers B, may both be positively rotated, but it is preferred to rotate the
rollers B, by pulleys b, and cause them to rotate the disc A, the said disc A and
rollers B being preferably pressed together by weights, or springs, adjustable to
give the requisite pressure. The conical disc A, is carried by a stem a, passing
through a stuffing box c, the stem being mounted in a cross bar E, having an
upward pressure exerted upon it by springs e, acting on rods e, attached to the ends
of the said cross bar. Through stuffing boxes 62, project two shafts ³, their inner
ends being secured to the aforesaid conical rollers B, which bear on the aforesaid

page_text: disc A the outer parts of the shafts carrying the pulleys or other gearing, by
which they are driven, and being supported in bearings as shewn. The inlet for
the material to be operated upon enters the vessel, or receptacle, and the water is
admitted at the axes of the rollers as herein before described. The vessel, or
receptacle C is provided below the acting surfaces of the disc A, and rollers B with
an outlet (or outlets) by which the heavy deposited portions, or precious metals
can be drawn off, as required and above there may be provided another outlet g (or
outlets) by which heavy gangue or sludge can be removed. C' is an inclined
trough for receiving the overflow to conduct it to an outlet pipe, or channel.
It will be understood that there may be one, two, or more rollers B acting in
conjunction with the disc A.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is―
1. The arrangement, and combination, of parts constituting the pulverizing, or
reducing, machine or apparatus substantially as hereinbefore described and
illustrated by the accompanying drawings.
2. In pulverizing, or reducing machines or apparatus the combination of a conical
grinding surface and a grinding roller, or grinding rollers enclosed in a casing and
with an inlet for water from below, and an exit therefor from above substantially
a hereinbefore described.
Dated this 28th day of Mon 1001
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.