An Improved Ore Mlll.
Year: 1890

page_text: Date of Application, 2nd July, 1890
Complete Specification Left, 2nd Apr., 1891-Accepted, 2nd May, 1891
PROVISIONAL SPECIFICATION.
An Improved Ore Mlll.
I, JOHN PITT BAYLY, of 18 Fulham Place Paddington, in the County of
London, Patent Agent, (a communication to me from abroad, by James Kingsland,
of Flatbush, New York, U.S.A., Inventor,) do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improved mill for grinding ores, and which invention
has for its object, the provision of a mill which will grind said ores more efficiently
and more rapidly than those mills of the same class at present in use.
The mill consists of a cylinder suitably journalled and provided with suitable
inlets and outlets at its ends. This cylinder is adapted to be rotated by suitable
means for that purpose provided. The inner faces of the ends or covers of this
cylinder are inclined and are therefore not at right angles with the bore of the
cylinder. Heavy rings of unequal diameters are loosely placed side by side in the
interior of the cylinder, and incline over to one side, by reason of the inclined
faces of the covers. The outlets of the cylinder may be two or more in number
and be provided with gravitating covers which are placed at different points around
the axis of the cylinder, and are adapted to be automatically opened and closed by
the revolution of the cylinder. Set-screws are provided to regulate the movement
of the covers.
Dhic and dan of Tul, 1900
J. P. BAYLY,
Applicant.
COMPLETE SPECIFICATION.
An Improved Ore Mill.
I, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a com-
munication to me from abroad by James Kingsland, of Flatbush, New York, U.S.A.
Inventor,) to be as follows:-
The object of the invention is to provide means for grinding ores and other sub-
stances, which shall be simple in construction and efficient and durable in
operation; and it consists in the matters hereinafter described, and pointed out in
the claims.
In the accompanying drawings,
Figure 1 is a longitudinal section of the improved mill, and
Fig. 2 is an elevation of the discharging end.
Figs. 3 and 4 are side elevations of rings, and
Figs. 5 and 6 are views of modified forms.
The improvement may be applied to revolving cylinders of a well-known type-
such as indicated in Fig. 1 in the drawings. These may be mounted on friction-
rollers and revolved by gearing of any approved kind. Within the cylinder is
placed a series of heavy rings 2 in such manner that they each rest upon an edge or
on one side of the curvilinear face of the ring, as at 3. Preferably the rings are
held in an inclined position and so as to stand upon an edge, as above stated, by the
inclined inner faces of the cylinder heads. In the position illustrated these heads
hold the rings so that they stand upon the edges opposite the end in which is the
charging inlet 4, while the edges near said end are elevated slightly above the
bottom of the cylinder; but it is obvious that when the cylinder with its contained
rings is caused to revolve the inclination of the inner faces of the cylinder-heads
will be reversed with each half-revolution and that continued rotation will impart

page_text: to the rings a movement in the direction of the axis of the cylinder of an oscillatory
character, whereby particles of ore or other material falling under the rings will be
crushed against the cylinder-wall.
The rings are preferably made of different diameters, whereby they move with
unequal velocity when revolved by the rotating cylinder, whereby they grind the
material between their faces. To increase this effect, as well as to facilitate the
centrifugal movement of the material, the inner circumferential edges of the rings
are chamfered or bevelled, as indicated at 5 and 6, and preferably at different
angles. For example, one bevel may have an inclination to the main face of the
ring of twenty-two and one-half degrees and another one of forty-five degrees but
these angles may be varied. Their effect is to increase the movement of the con-
tents of the space inclosed by the rings and to increase the grinding effect produced
by their faces. Thus the face 13 of a small ring will, by the revolution of the
cylinder, be brought against the bevel 5 of a larger ring, and the face 13 of a
larger ring will be brought in contact with the edge of a smaller ring, whereby a
variety of grinding contacts are produced.
At 7 are indicated passages radially disposed in the ring-faces, which passages
receive material and facilitate its centrifugal movement, and as the rings move
with different angular velocities, because of the inequality of their diameters, said
passages in the different rings will be carried by each other in such manner that
their edges will have a shearing action..
In some cases the rings are cored out to provide an interior chamber adapted
to receive water, mercury, or other fluid, whereby the temperature or the move-
ment of the rings, or both temperature and motion, may be modified. Thus, for
example, water or other fluid colder than the contents of the cylinder would tend
to prevent rise of temperature, and it could also be used to cause a variable centre
of gravity in a ring, and thus retard or modify its rotary movement.
At the delivery end of the cylinder one or more exit openings 8 are provided, and
by preference two or more are employed and arranged with gravitating covers or
slides 9, automatically moving in dovetailed ways in such manner that they will drop
by gravity and close each opening when it is brought by the revolution of the
cylinder to its lower position, and will in like manner uncover said opening when
it approaches its highest position. The effect of this construction is to prevent the
ground material from leaving the cylinder except through an opening in its upper
part. The size of this opening or of such openings may be regulated by an
adjustable block 10, fastened at will by a set screw, and this device can also be
used when desired to temporarily close the exits.
any
In Fig. 2 the lower discharge opening is shown as closed by the sliding cover 9,
after it has been moved down to its lowest position by gravity. As the cylinder
revolves, this cover will be moved in its ways or guides by gravity, so as to open
the discharge, as indicated at the upper part of said figure. The blocks 10 are
made adjustable toward and from the openings, and are secured in desired
position by set-screws. As represented, they are set to permit the openings 8 to
be entirely uncovered by the falling of the covers 9; but the blocks may be moved
toward said openings and fastened by screws or otherwise, so that the sliding
covers are prevented from moving to uncover the discharge-openings entirely, or, if
desired, so as to close the openings during the entire revolution. It is obvious that
the set-screws could be otherwise applied, or that well-known equivalents could be
substituted.
The exit end of the cylinder is preferably provided with an annular ring or
skirt 11, having interior blades or wings 12, which may have an oblique arrange-
ment, as indicated. These wings will cause a slight air-current, tending to withdraw
the fine material from the cylinder and direct it away therefrom.
The operation of the invention can be understood from the above description.
Ore or any suitable substance to be ground is fed into the charging-inlet 4 by any
usual means while the cylinder and its contained rings are being revolved, and finds
its way into and through the interior passage formed by the central holes in the

page_text: several rings and into the spaces produced by the chamfered inner edges of the
rings, and into the passages 7, and to a small extent between the plane faces of said
rings and underneath their circumferential faces, in which situations it is crushed
or ground and speedily reduced to a sufficient degree of fineness. The escape from
the cylinder is regulated by the gravitating covers of the exits, as before stated.
The otherwise empty spaces of the cylinder and grinding rings will be filled with the
ore or other material in constant notion and subjected at different points to a
variety of pulverizing actions. The rings, for example, will break and crush under
their lowest faces, while they will rub or triturate between their parallel faces, and
the edges of the passages 7 will have a shearing effect, as will also the outer edges
of the smaller rings. The passage of material through the revolving cylinder can
be regulated or altogether suspended for a time, if found desirable.
The mill is ordinarily full of the material being ground, which will be forced
along toward the delivery end by the rotation of the cylinder and the consequent
movement of the rings and material. The return of the latter toward the inlet is
hindered by the fresh charge and also by a suitable inclination of the cylinder, if
necessary. The blades 12 also produce suflicient draft to remove the finely ground
material from an open exit, and said material can be received and conveyed away
in any usual or convenient manner.
It will be obvious that the invention is independent of the material used in the
construction of the machine. Cast-iron is suitable for the purpose, and preferably
The number of
the rings and cylinder are made of the same degree of hardness.
the rings is not of the gist of the invention, not the number of the passages 7, and
these might be omitted without sacrificing all the advantages of the improvement,
as also might be the chamfering of the inner edges of the rings.
More than two sizes of rings could be employed, and a part only could be
provided with diametric passages or with bevelled edges.
A crushing action of the rings might be produced by providing their peripheries
with oblique faces, as indicated in Fig. 5.
Various other particulars may be modified by mechanical skill without essentially
altering the principles of operation.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a grinding apparatus, a cylinder provided with suitable inlet and outlets,
and means for rotating it, in combination with rings loosely placed side by side in
its interior, said rings being of unequal diameters and provided with faces 13, and
having their inner edges chamfered, substantially as set forth.
2. In a grinding apparatus, a cylinder provided with suitable inlets and outlets,
and having the inner faces of its head inclined to its axis, in combination with
rings loosely placed in its interior, substantially as set forth.
3. In a grinding apparatus, a cylinder provided with two or more exits having
gravitating covers placed at different points around the axis of the cylinder and
adapted to be automatically opened and closed by the revolution of the cylinder,
substantially as set forth.
4. In a grinding apparatus, a cylinder provided with two or more exits having
gravitating covers placed at different points around the axis of the cylinder and
adapted to be automatically opened and closed by the revolution of the cylinder,
and set-screws for regulating the extent of the movement of the covers, substantially
as set forth.
די
11
A 1901
J. P. BAYLY,
Per P. W.,
Applicant.