Improvements in Grinding Mills.
Year: 1890

page_text: Date of Application, 30th Dec., 1890
Complete Specification Left, 30th Oct., 1891-Accepted, 12th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Grinding Mills.
I, PERCY JOHN NEATE, of Rochester, in the County of Kent, Consulting and
Mechanical Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in grinding mills, and more particularly to
those types of mills in which the trituration is effected between portions of the
peripheries of solid spheres or rollers on the one hand, and of the surface of a bed
plate or the periphery of an opposite roller on the other hand, towards which bed
plate the said spheres or rollers are approached by their own weight or centrifugal
force or other means, or, in the case of pairs of rollers, by suitable special
devices.
The operative pressure between the spheres or rollers and the base plate being
limited by the weight of the former, or by the pressure which causes one of them
to press upon or against the other, it follows that the supply of stuff should be
automatically regulatable from the grinding or triturating part of the mechanism,
or from some other part, to the intent that the supply of stuff to the mill should
always be either checked or increased as the maintenance of the thickness of
the layer of stuff under process of grinding or trituration may require.
In carrying my invention into effect, I make use of, in the first place, any
suitable type of feed-mechanism, and connect the operative, or delivering, member
of it with the adjustable (or one adjustable) member of the grinding or triturating
mechanism, in such a, or any, way, that when the distance between the operative
surfaces of the grinding or triturating mechanism above mentioned is increased,
the supply of stuff will be pari passu stopped and vice versâ.
Or, in other words, I provide the mill with an apparatus by which the quantity
of stuff in the mill is measured in respect of its thickness or depth, or rate of
overflow, and the gauge thereof transmitted automatically to the feed-controlling
device.
I do not confine myself to the details of the mechanism which I, for the purpose
of my invention, interpose between the normal feeding mechanism and the operative
part of the mill.
One way in which my present invention may be carried into effect in the case of
a grinding mill known as an edge runner is as follows:-An inverted cone, having
its periphery roughened by corrugations radiating from its apex, is fitted loosely
upon the vertical shaft, and is connected by suitable links to the axle of one of the
runners, so that it can slide up and down the vertical shaft as the said axle rises or
falls. A shaker box is combined with the feed, and connected with the cone, by a
suitable extension, or finger, which is caused to enter the corrugations in the
periphery of the said cone by any suitable device.
So long as the stuff is being fed into the pan of the edge runner at a normal
rate, so long will the connection between the finger and the cone remain normally
operative, but, if the feed be interrupted, the cone will be pushed down the shaft,
and, therefore, work the shaker box more vigorously, while, on the other hand, if
the feed become excessive, the cone will ride up the shaft, and nearly, or altogether,
according to the distance through which it is raised, disengage from the finger on
the shaker box.
My invention allows of the type of the mechanism connecting the feed mechanism
with the adjustable member of the grinding or triturating mechanism being varied
to any extent, and, provided that it will discharge the function which the invention

page_text: requires of it, the selection may be left to be decided by considerations of
convenience or circumstance.
Among other practicable modifications I instance the following:-
:-
(a). Where edge runners or balls are employed, the regulating motion may be
taken from a loading disc riding upon the top of the runners, or the balls, or the
motion, may be reversed by the introduction of suitable levers and links, and the
cone be reversed also. The advantage of this reversal is that the cone would
drop out of gear if any member of the intermediate gear should fail.
(). The cone may be dispensed with, and a shaking motion be taken from the
underside of the axle ends.
(c). A special slider or runner may be adopted to move over the stuff in a fixed
plane normally, and to rise and fall thereout as the level varies, this motion of
rising and falling to be communicated pari passu to the feed-controlling device.
(d). The motion produced in any convenient way may be made to actuate a
clutch, or fast and loose pulleys, or one disc rolling upon the surface of another
disc, so as to transmit an intermittent motion, or one of a variable velocity, to the
feeding controlling device.
(e). When the ground stuff is taken away by elevators, or any analogous device
in which its weight would make itself felt, the top axis, or any member bearing
any portion of the weight of the material, is hung from a spring in such a way that
the axis would be moved in one direction against the spring by the increased weight
of stuff in the elevator, or pushed in an opposite direction by the spring if the
weight decreased. This movement could be multiplied by mounting the parts on
or in connection with a lever from the end of which the motion could be utilised
in the direction of communicating it to the feed regulating device by any suitable
device.
. Dated this 30th day of December 1890.
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Grinding Mills.
I, PERCY JOHN NEATE, of Rochester in the County of Kent, Consulting and
Mechanical 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:-
My invention relates to improvements in grinding mills and more particularly to
those types of mills in which the trituration is effected between portions of the
peripheries of solid spheres or rollers on the one hand, and of the surface of a
fixed bed plate or rotating pan on the other hand towards which bed plate or pan
the said spheres or rollers are approached by their own weight, or by centrifugal
force or by other means, or in the case of pairs of rollers, by suitable special
devices.
The operative pressure between the spheres or rollers, and the base plate, being
limited by the weight of the former, or by the pressure which causes one of them to
press upon or against the other; it follows that the supply of stuff should be
automatically regulatable from the grinding or triturating part of the machine, or
from some other part; to the intent that the supply of stuff to the mill should or
might be always either checked or increased as the maintenance of the thickness
of the layer of stuff under process of grinding or trituration may require.
In order that my invention and the means by which it is to be carried into
practical effect may be thoroughly understood I will now describe them in detail
referring in so doing to the accompanying drawings which are to be taken as part
of this Spec.fication and read therewith. Like parts are marked throughout with
the same reference letters.

page_text: In carrying my invention into effect, I make use of, in the first place, any
suitable type of feed-mechanism and connect the regulatable member of it with the
adjustable (or one adjustable) member of the grinding or triturating mechanism or
with the mechanism employed to remove the ground products in such a, or any,
way, that when the distance between the operative surfaces of the grinding or
triturating mechanism above mentioned is increased or the removing mechanism
is overloaded the supply of stuff will be pari pussu stopped and vice versa.
Or, in other words, I provide the mill with an apparatus by which the quantity
of stuff in the mill is measured in respect of its thickness or depth or rate of
overflow, and the gauge thereof transmitted automatically to the feed-controlling
device.
I do not confine myself to the details of the mechanism which 1, for the purpose
of my invention, interpose between the normal feeding mechanism and the operative
part of the mill.
My invention allows of the type of the mechanism connecting the feed mechanism
with the adjustable member of the grinding or triturating mechanism, being varied
to any extent and provided that it will discharge the function which the invention
requires of it, the selection may be left to be decided by considerations of
convenience or circumstance.
One way in which my present invention may be carried into effect in the case of
a grinding mill known as an edge runner is as follows:--A cone having its periphery
roughened by corrugations radiating from its apex, is fitted loosely upon the vertical
shaft, and is connected by suitable links to the axle of one of the runners, so that
it can slide up and down the vertical shaft as the said axle rises or falls. A shaker
box is combined with the feed, and connected with the cone, by a suitable extension
or finger, which is caused to enter the corrugation in the periphery of the said cone
by any suitable device.
So long as the stuff is being fed into the pan of edge runner at a normal rate,
so long will the connection between the finger and the cone remain normally
operative, but, if the feed be interrupted, the thickness of the stuff in the pan will
decrease and the corrugated cone will be pushed up the shaft and therefore work
the shaker box more vigorously, while on the other hand, if the feed become
excessive the cone will ride down the shaft and nearly or altogether, according to
the distance through which it has fallen disengage from the finger on the shaker
box.
Referring to Figs. 1 and 1 a is the base plate, or, in the case of an edge runner
the pan and b is one of the runners. c is the shaker box and d its finger. e is the
cone the periphery of which carries a series of tapered corrugations e'. is a
sleeve. This sleeve may be only a downward continuation of the cone.
g is a
forked lever having its fulcrum at g' upon an arm projecting from the vertical
shaft . i is a link connecting the lever to the runner axle . j is a rod fast to
the shaker box. is a regulating stud and is a spring between the two rods.
When edge runners or balls are employed the regulating motion may be taken
from a loading disc riding upon the top of the runners, or the balls.
Referring to Fig. 2 a is the base and k, k, are the grinding spheres. is a
loading disc to which the inverted corrugated cone is fixed. The shaker box, its
finger, and the vertical shaft are as described with reference to Fig. 1 and are
accordingly marked with the same reference letters. So soon as the layer of stuff
under the grinding spheres gets too thick, the latter are raised and in their
turn, lift the loading disc thereby more or less disengaging the cone e³ from the
finger d.
The cone may be dispensed with and a shaking motion be taken from the under-
side of the axle ends.
Its
Referring to Fig. 3, 7 is a shoot pivotted at 11. 12 is a link and lever gear.
terminal 3 is shown as an antifriction roller but whatever form it takes it is always
kept by the weight of the shoot / bearing against the stop in such a position that
it is depressed with more or less force by the under side of the runner axle . The

page_text: regulating operation is as follows. The normal angle at which the shoot / is set
delivers the stuff at a normal rate. If say, too little is being delivered then the
runner drops and this drop will have the effect of increasing the vibration given to
the shoot down which the stuff will then be delivered at a greater rate.
A special slider or runner may be adapted to move over the stuff in a fixed
plane securely and to rise and fall thereon as the level varies, this action of rising
and falling to be communicated pari passu to the feed controlling device.
Referring to Fig. 4 m is a slider connected by links m' m' to the cone e, and
pivotted by a link m² to the shaft h. This with the shaker box, its finger and
the vertical shaft are of the same construction as is described with reference to
Fig. 2.
The motion produced in any convenient way may be made to actuate a clutch or
fast and loose pulleys or one disc rolling upon the surface of another disc, so as to
transmit an intermittent motion, or one of a variable velocity, to the feeding
controlling device.
Referring to Fig. 5 the sleeve is engaged by the forked end of a lever n having
its fulcrum at n'. The opposite end of the lever has the strap shifter n² pivotted
to it so that as the runner is raised by the increasing thickness of the layer of
stuff under it, the strap will be pulled more or less off the driving on to the loose
pulley.
When the ground stuff is taken away by elevators or any analogous device in
which its weight would make itself felt, the top axis or any member bearing any
portion of the weight of the material, is hung from a spring in such a way that the
axis would be moved in one direction against the spring by the increased weight of
stuff in the elevator, or pushed in an opposite direction by the spring if the weight
decreased. This movement could be multiplied by mounting the parts on or in
connection with a lever from the end of which the motion could be utilised in
the direction of communicating it to the feed regulating device by any suitable
device.
Referring to Fig. 6o is the elevator the top drum of which is carried by a
sliding bearing o². This bearing is held up by rods o³ and springs o. p is a lever
and p a connection from it to the nose of the shaker box 1. The opposite end of
the lever is connected to the sliding bearing o². e is a cone corrugated on its
periphery as hereinbefore described with reference to Fig. 1.
The finger engaged by the cone is on the end or nose of the shaker box l.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is,
1. The combination with the operative part of a grinding mill or of an edge
runner of any description and the feed portion thereof of a device or mechanical
connection between the said part and portion adapted to regulate the rate at which
the stuff is being fed into the mill or runner at any given moment by the quantity
of material on the bed plate.
2. The combination with the operative part of a grinding mill or of an edge
runner of any description and the feed portion thereof of a device or mechanical
connection between the said part and portion adapted to regulate the rate at which
the stuff is being fed into the mill or runner at any given moment by the quantity
of material being removed from the bed plate.
3. The several automatic feed-regulating devices or any of them as illustrated.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.