A New and Improved Machine for Crushing and Pulverising Rook, Minerals, Ores, and the like.
Year: 1895

page_text: Date of Application, 28th Feb., 1895-Accepted, 6th Apr., 1895
COMPLETE SPECIFICATION.
A New and Improved Machine for Crushing and Pulverising Rook,
Minerals, Ores, and the like.
We ROBERT HANDLEY DUNDEE, Gentleman, and FREDERICK GEORGE JONES,
Engineer, both of Quarry Park Grampound in the County of Cornwall, do
hereby declare the nature of this invention and in what manner the same is to be
1erformed, to be particularly described and ascertained in and by the following
statement :-
The machine invented and herein described is designed for the purpose of
pulverizing quartz, ores, minerals, and other similar substances:
That is to say, the material is delivered into the machine in pieces not larger
preferably than from ten to twenty cubic inches, and is therein reduced to powder of
varying degrees of fineness, or mesh, as desired.
The forces brought to bear upon the material under treatment in this machine,
may be comprehended as percussive and abrasive, and those portions of the said
machine which directly operate to effect the said percussive, and abrasive action,
are: a heavy hammer block, and a hollow rotative cylinder.
This machine is made preferably of iron or steel, but otherwise of any suitable
material.
The said cylinder is closed at one end, and at this sald end it is rigidly and
axially mounted upon one extremity of a strong spindle.
The said spindle is journalled horizontally in suitable bearings on a main frame,
and the spindle is fitted with a pulley or pulleys, or gearing for the purpose of
receiving motion.
The said cylinder is lined on its inner circumference with segmental plates
removably, and the said plates are made preferably from steel or iron suitably
hardened, but any material suitably to the purpose may be used.
The cylinder is accessable at that end most remote from the said spindle, and this
said accessable end, is partly covered with a frame into which is fitted screens of
gauze, metallic or otherwise; for the purpose of grading the pulverized material,
which is sifted through them.
The cylinder, with frame and screens attached revolves in a vertical plane.
The heavy hammer block before mentioned rests at one of its extremes upon the
segmental plates with which the said cylinder is lined, and for a suitable length of
are the face of the hammer block corresponds with the curve of the said segmental
plates. At the lower or underside of the hammer block, the face of the said block
receeds from contact with the said segmental plates, and this line of recession may
be plane, curved, polygonal, or grooved as desired.
This said face of the hammer block which in part corresponds with the curve of
the said segmental plates, and in part receeds therefrom, is called the working face;
and the said working face may be formed upon a loose or removable piece suitably
attached to the hammer block, or the said hammer block may be in one piece. The
removable face as described is arranged for the purpose of renewing the face from
time to time as it becomes worn.
The said hammer block is suitably provided with an eye as hereinafter shown,
and is thereby movably attached to a rigid stud which projects into the said
cylinder at the open or accessable end before mentioned, of the said cylinder.
That end of the rigid stud remote from the hammer block, is firmly fitted into
and held by a strong standard exterior to the revolving cylinder.
The hammer block described may be divided longitudinally, that is to say it may

page_text: be formed of two or more separated sections adjacent to each other and movably
upon the said rigid stud.
The hammer block in its various forms is free to move in a vertical plane radially
to the said rigid stud. That is to say in the plane of rotation of the cylinder
before mentioned and described.
The said cylinder is covered with a suitable fixed casing to prevent the escape of
dust, and a hopper is fitted to the said casing whereby the material to be treated is
received and passed into the machine.
In operating the machine as described herein, the material passes from the hopper
on the outer casing into the revolving cylinder, and the said material is carried at a
high velocity against the working face of the hammer block; the resulting blow is
sufficient to reduce or break down the material to such a degree, that it is carried
by the continuously rotating cylinder, and forced between the face of the hammer
block and the segmental plates at that part where the surface contours correspond.
This treatment is very effective, and secures the desired pulverization rapidly and
thoroughly.
The rotation of the cylinder, and screens attached causes the pulverized material
to be thrown upon the said screens, whereby the material is sifted through the
screens and falls into a receptacle suitably provided, and is conveyed from the
machine.
The weight of the hammer block can be regulated for varying materials, or
grades of the same, and the velocity of rotation of the cylinder can be varied in
any reasonable degree to give blows of greater or less force as may be desired.
The hammer block vibrates-radially to the stud upon which it is mounted-
under the impact of the material carried against the said block, and the said
vibration produces a hammer like action which. assists in a thorough reduction of
the material under treatment.
The machine as described is susceptible of modification generally, that is to say
two separate and distinct cylinders as described with all the accessories of hammer
blocks, segmental plates, studs, standards, screens and minor details may be mounted
upon one and the same spindle journalled as described, and the whole forming a
double machine.
A clear understanding of the foregoing will be obtained if reference be had to
the accompanying drawings where similar letters of reference represent similar parts
of the said machine.
Figure 1. is an elevation at the accessable end of the revolving cylinder. An
arrow indicates the direction of rotation of the cylinder relatively to the hammer
block, and also the position of the material under treatment as at the point of
impact with the hammer block.
A is the cylinder, B the hammer block anchored movably on the stud J. The
cylinder is lined with segmental plates at F, and is mounted upon the spindle C
journalled at D.
The spindle is fitted with pulleys or gearing at E.
H is the removable working or wearing face as mentioned in conjunction with
hammer block.
Figures 2 and 3 are elevations of the hammer block at the entering or impact
side. Fig. 2 represents the sectional hammer block as described, formed of two
or more adjacent pieces. Fig. 3 represents the hammer block in one piece. Either
or both types of hammer block as described may be fitted with removable working
faces as at H in Fig. 1.
Fig. 4 is a longitudinal elevation of the machine, and shows the revolving
cylinder at A, spindle C journalled at D, D, on the main framing O. The rigid
stud J held in the standard 'L.
The screen frame partly covering the accessable end of the revolving cylinder is
shown at G, and the outer casing at K with hopper M.
The machine is modified, when desired, as before described, forming a double
machine, and as indicated in Fig. 4 by the dotted outline.
"

page_text: 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 combination with a hollow rotative cylinder of a heavy hammer block.
The said hammer block mounted movably on a rigid stud as described and. shown
herewith, and for the purpose named.
2. The combination described, and the said cylinder mounted rigidly on the end
of the spindle as shown and journalled, the spindle and cylinder rotatively. The
same with duplicated cylinders and parts as shown.
3. The combinations described, and with removable wearing parts as to the
hammer block faces, and segmental plate lining of the cylinder as described and
shown, and the hammer block in one piece, or in sections, adjacent and movable on
the said stud radially in a vertical plane, also as described and for the purpose
named. That is to say the effectual and rapid reduction to powder of minerals
and other like substances.
Dated this 22nd day of February 1895.
ROBERT H. DUNDEE.
F. G. JONES.