Improvements in Mills for Grinding or Reducing Quartz and other Materials.
Year: 1887

page_text: Date of Application, 31st Aug., 1887
Complete Left, 31st May, 1888
Complete Accepted, 6th July, 1888
PROVISIONAL SPECIFICATION.
Improvements in Mills for Grinding or Reducing Quartz and other
Materials.
We RICHARD MORRIS of Beechfield Doncaster in the County of York Engineer
and JAMES WOOD of West Stock with in the County of Nottingham Engineer do
hereby declare the nature of this Invention to be as follows:-
This Invention has for its object, to provide a mill which is very efficient in action
and convenient and economical in use as hereinafter explained. The shaft which
drives the rollers is made with a forked lower extremity which has in each of its
arms a slot through which passes the axis of the rollers. These slots allow the axis
and rollers to rise and fall, the arms are joined together again beneath the axis of the
rollers and have a centre piece working in a footstep bearing. Between the arms of
the fork above the axis a spring is situated with a screw for adjustment which spring
presses the rollers down upon the grinding surface so as to supplement the weight of
the rollers as may be desired. The grinding surface between which and the rollers
the material is operated upon is at the bottom of a circular groove with inclined sides
which constantly feed the material down to beneath the rollers. This groove in the
case of wet grinding may be surrounded by a raised rim in which there is an outlet
or overflow for the materials treated and this outlet may be made adjustable vertically
to a greater or lesser distance above the bed so that the degree of fineness at which
the materials come off inay he regulated by raising or lowering the outlet or over-
flow. Where a supply of liquid is used it inay be led through pipes and passages
down to a number of openings for supplying the liquid into, the groove in which the
rollers run so as to be emitted near to the operating surfaces which will cause
an upward current and so carry away the fine material as produced and economize
water.

page_text: COMPLETE SPECIFICATION.
Improvements in Mills for Grinding or Reducing Quartz and other
Materials.
We RICHARD MORRIS of Beechfield Doncaster in the County of York Engineer
and JAMES WOOD of West Stockwith in the County of Nottingham 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 has for its object to provide a mill which is very efficient in action
and convenient and economical in use as hereinafter explained with reference to the
accompanying drawings Figure 1 of which shows in sido elevation a mill constructed
according to this invention. Figure 2 is a transverse section on the line 1, 2 of
Figure 1. The shaft A which drives the rollers F (through the pulley B, shaft C,
and gear wheels D) is made with a forked lower extremity which has in each of its
arms aa a slot through which passes the squared part of the axis E on which the
rollers Fare mounted so that they can revolve. These slots allow the axis E and
rollers F to rise and fall, and act as a guide and driver for the rollers. The arms a a
are joined together at a2 beneath the axis E and have a centre piece or footstep G
working in a footstep bearing g Between the arms a a and above the axis E a
spring His situated which spring presses the rollers F down upon the annular
grinding surface i so as to supplement the weight of the rollers as may be desired.
is a screw provided with a collar 2 for turning it tho said screw working in the
top bearing plate h³ so that by turning the screw the pressure of the spring H can
be regulated. The grinding surface (between which and the rollers F the material
is operated upon for grinding or reducing it) is at the bottom of a circular groove
with inclined sides which constantly feed the material down to beneath the rollers F.
The peripheries of the rollers F and the bearing surface i may be horizontal but they
are preferably bevelled inwards as shown to give more friction in work. The surface i
may be made removeable for ready renewal when worn. The groove in the case
of using the machine for wet grinding may be surrounded by a raised rim J in
which there is an outlet or overflow j for the materials treated and this outlet may
be made adjustable vertically to a greater or lesser distance above the bed so that the
degree of fineness at which the materials come off may be regulated by raising or
lowering the outlet or overflow.. There is shown in Figure 2 (and in front view in
Figure 3) for this purpose a spout fixed to a plate j³ sliding in guides at the sides
of the outlet. The full lines in Figure 2 show it at a low elevation and the dotted
lines in a raised position. Where a supply of liquid is used it may be led through
pipes and passages down, to a number of openings (two of which are shown at kk)
for supplying the liquid into the groove in which the rollers F run so as to be emitted
near to the operating surfaces which will cause an upward current and so carry away
the fine material, as produced, and economize water. A space may be left on each

page_text: side of the rollers in the bottom of the groove in which to put quicksilver to
amalgamate with the gold as it is separated from gold quartz. The rollers may have
renewable crushing peripheries affixed by bolts or other fastenings as indicated at a
in Figure 1.
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. The arrangement and combination of parts constituting the grinding or reducing
mill herein before described and illustrated in the accompanying drawings.
2. In grinding or reducing mills a forked or slotted container, guide and driver
for the rollers with a spring above substantially as herein before described and
illustrated.
3. In mills for grinding and reducing a groove (3) with sloping sides for keeping
the material under the action of the rollers as hereinbefore described and illustrated.
4. In mills for grinding and reducing a rim (J) with a vertically adjustable outlet
substantially as herein before described and illustrated.
1000
J. H. JOHNSON & Co.,
Agents.