Improvements in Pulverizing Mills.
Year: 1890

page_text: Date of Application, 24th June, 1890-Accepted, 16th Aug., 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by VIETTS LYSANDER RICE, of 251, West Thirty-
fourth Street, City and State of New York, United States of America,
Manufacturer.]
Improvements in Pulverizing Mills.
I, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co. Patent Agents
45 Southampton Buildings in the County of Middlesex, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularlý
described and ascertained in and' by the following statement :-
This improvement consists of a pulverizing mill having a chamber for receiving
material to be pulverized, a number of rolls adapted to work around the interior of
the same and mounted upon shafts, a main shaft, a head carried by the main shaft and
oscillating bearings which receive the roll shafts and are connected with said head at
points which are nearer to the axial line of the main shaft than the rolls will be when
working against the interior of the chamber so that the rolls and their shafts will
swing outwards through centrifugal force when in use and when out of use will fall
away from the interior of the chamber.
One or more of the roll shafts will preferably have a spiral flange for removing
pulverized material from the chamber. Preferably the main shaft will be made to
taper longitudinally and will have combined with it an internally tapered sleeve which
may be adjusted longitudinally to compensate for wear. A simple way of providing
for the adjustment of said sleeve is to provide it with circumferential grooves and ribs
and to combine with the latter a lever having one end provided with teeth which are
adapted to engage with the grooves.
The bearings for the roll shafts will preferably be made of two cylindric sections
arranged one within the other, and, when so made the portions of these shafts which
fit the inner sleeves and the inner surfaces of the inner sleeves will be tapered. The
inner sleeves will then be made adjustable relatively to the outer sleeves to compensate
for wear.
Trunnions on the outer sleeves will engage with the head which is carried
by the main shaft.
The main shaft will preferably be made hollow and will be supported by means of
an outwardly extending flange sustained by a hub with which the main frame of the
machine is provided. It will be filled with oil and this will be free to lubricate the
bearing between the said part and the flange. The interior of the shaft will also com-
municate with passages and pipes provided in the head which is carried by the shaft
and leading to trunnions with which the oscillating bearings on the roll shafts are
provided. This enables all the parts to be lubricated from a common point.
In the accompanying drawings, Figure 1 is a vertical section of a mill embodying
the improvement. Figure 2 is a horizontal section taken at the plane of the dotted
linear Figure 1. Figure 3 is a horizontal section of certain parts on the plane of
the dotted line y y Figure 1. Figure is an enlarged vertical section of certain
parts. Similar letters of reference designate corresponding parts in all the figures.
A designates the chamber, here shown as made in the form of a pan. It may be
made of any suitable material as, for instance, of iron. In it is a ring B which as
here shown is set into the recess formed in the inner side of the chamber A. This
ring forms one of the grinding or pulverizing surfaces and may be made of any
desirable material, as for instance, steel.
C designates a number of rolls arranged to travel around the interior of the ring B.
As this ring is in effect a part of the chamber, the rolls may be regarded as travelling
around the inner surface of the chamber. There are in the present instance three of
these rolls C and they are affixed to upright shafts D, which are journalled so as to be
free to rotate within journal boxes E that are arranged in a head F. The head F is of

page_text: small diameter as compared with the diameter of the chamber A, so the rolls have to
swing outwardly into positions which cause their shafts D to diverge from each other,
in order to contact with the ring B. The journal boxes E are severally composed of
two shells e¹ e. The outer shell e¹ is provided with trunnion; e which fit in bearings
provided in the head F in such a manner as to be free to oscillate. At the upper end
the shell el is provided with a shoulder e³ upon which rests the head d of the corre-
sponding shaft D. In this way, said shaft is supported vertically. There is a rim e¹
extending above the shoulder e and surrounding the head d. The interior of the
outer shell e¹ and the exterior of the inner shell e² are cylindrical and are screw-
threaded at the lower ends so that the inner shell may be adjusted longitudinally
within the outer shell. The upper portion of each shaft D is upwardly tapered and
the interior of the corresponding shell e² is correspondingly tapered so that by adjusting
said shell e² longitudinally, it may be made to compensate for any wear occurring
between it and the shaft and thus hold the shaft. firmly. Each shell e² is made of two
longitudinal sections.
The head F is secured to a main shaft G which is supported in a frame H. This
frame H may be made of any suitable material and consists of a head h and a number
of converging standards h¹ which are fastened at the upper end to the head and at the
lower end rest upon any suitable support. The head has a central hub 2 and in this
is fitted a vertically adjustable bearing sleeve I. Internally this sleeve tapers down-
wardly and within it receives a downwardly tapering portion of the main shaft G.
The main shaft is supported vertically by having cast integral with it a flange G¹
which is sustained by the hub 2 on the head h of the frame H. Preferably two
washers are interposed between the top of this hub and the bottom of the flange so as
to reduce friction. A belt pulley G2 is fastened to the upper portion of the shaft G.
The head F is secured to the lower end of the main shaft G, hence when the main
shaft is rotated the shafts D and rolls C will be revolved around the axis of the main
shaft. Centrifugal force generated by this revolution of the rolls and their shafts will
cause the rolls to swing outwardly into contact with the surface of the ring B. The
friction which will be generated at the surface of the rolls in their rotation will cause
them to rotate on their own axes as they are revolved around the chamber. When
the rolls are at rest they will fall away from the wall of the chamber.
Should looseness occur through wear between the main shaft G and sleeve I, the
sleeve may be moved upwards to compensate for this wear. A lever J fulcrumed
between its ends in the hub of the head of the frame H and having a toothed inner
end engaging with circumferential grooves and ribs in the sleeve, serves as a con-
venient means for adjusting the sleeve and retaining it in position. Should there be
wear on one side of the sleeve more than another the sleeve may be removed, partially
rotated and reinserted, and, to enable it to remain in any position into which it may
be adjusted, it and the hub and provided with a tongued and grooved connection. As
here shown, equidistantly arranged tongues i extend from the exterior of the sleeve I
into grooves formed in the interior of the hub.
The inner surface of the ring B is shown as vertically disposed and when it is so
disposed the rolls will taper downwardly so that the operating portions of their surfaces
will be substantially parallel with the interior of the ring.
The shaft G is made hollow from the upper end nearly to the lower end, but it is
closed at the lower end. Near the lower end are perforations g which extend radially
.outwards and communicate with similarly extending channels formed in the head F.
Preferably the head F is composed of two sections arranged one above the other and
secured by bolts and the channels f are formed partly in the upper side of the lower
section and partly in the lower side of the upper section. The shaft G is intended to
be kept full of oil and the oil is intended to flow from it into the channels of the head.
In the channels of the head are fitted pipes /. These may be made of any suitable
material. They may be ordinary gas pipes. Their ends which are the nearer to the
shaft are packed with leather so as to prevent leakage around the channels f. At the
outer ends these pipes are bent and enter cavities in the extremities of certain of
the trunnions e of the bearings E, but do not preclude the oscillation of the trunnions,

page_text: Oil may therefore flow from the shaft G into these, trunnions. The cavities in the
trunnions extend upwards through the outer shell e¹ of the bearings E and terminate
in the shoulders e³ of these sleeves. The oil will then lubricate the heads of the
shafts D and also lubricate the portions of these shafts D which fit in the inner
shells of the bearings E.
The shaft G has a radial hole g' opposite the washers which are arranged interme-
diately of the hub 2 of the frame H and the flange G³ of the shaft G. Wicking g³
is fitted into this hole g' and extends into the hollow of the shaft, hence oil may pass
from the shaft to lubricate the washers, the flange G' and the upper end of the hub /*
of the frame H.
On the under side of the rolls C are scrapers, C' which, as here shown, consist of
bent plates extending from dovetailed tongues which fit in radially extending dovetailed
grooves formed in the under sides of the shells.
Above the chamber A is a circular screen K. It may be mounted directly upon
the upper edge of the chamber and constructed to have a slight upward taper. It
may be made of any suitable perforated or reticulated material. Its upper edge may
be supported from the standards h¹. Preferably an annular plate L will be used above
it and when used will be supported by the standards and connected to the upper edge
of the shell so as to extend inwardly above the latter. M designates a shell extending
around the chamber A and having a section which extends around the screen K.
The space between the screen and upper section of the shell M communicates with
the space between the exterior of the chamber and the lower section of the shell M,
and the latter at the lower end is open to a hopper N which is arranged below the
chamber and shell.
It is intended that material when pulverized to the proper degree of fineness shall
escape through the screen and be discharged into the hopper.
One of the shafts D is provided with a spiral flange d. As this shaft rotates the
spiral flange will lift up the pulverized material and cause it to be distributed well
over the surface of the screen as it flies outward against the latter. All the roll shafts
may have such flanges.
N' is a conveyor for removing the pulverized material from the hopper N, and N2
is a chute through which material is fed to the apparatus.
Material will be pulverized between the rolls and ring B and also by the attrition
caused by the movement of particles of material resulting from the action of the flange
or flanges d¹.
Having now particularly ascertained and described the nature of my said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent I declare that what I claim is :
1. In a pulverizing mill, the combination of a chamber for receiving material to
be pulverized, a main shaft, a number of rolls, shafts upon which these rolls are
mounted, a head connected to the main shaft and oscillating journal bearings having
such relation to the main shaft that when the rolls are at rest said rolls will fall away
from the wall of the chamber.
2. In a pulverizing mill, the combination of a chamber for receiving material to be
pulverized, a roll or rolls arranged to travel around the interior of the same, a shaft or
shafts connected with the roll or rolls and provided each with a spiral flange, and a
main shaft revolving the roll shaft or shafts.
3. In a pulverizing mill, the combination of a chamber for receiving material to be
pulverized, a roll arranged to travel around the interior of the same, a shaft with
which said roll is connected, a main shaft having a flange which is sustained by the
main frame of the machine and which has a downwardly tapering portion, a sleeve
having an upwardly flaring interior surface fitting the downwardly tapering portion
of the main shaft and an exterior surface fitting a cavity or opening in the said frame
and a lever engaging with the sleeve for adjusting it longitudinally.
4. In a pulverizing mill, the combination of a chamber for receiving material to be
pulverized, a roll arranged to travel around the interior of the same, a shaft connected

page_text: with the roll, a main shaft, having a downwardly tapering portion and a laterally
extending flange, a frame through which said main shaft passes and which sustains
the flange of the latter and a sleeve tapering internally to fit the tapering portion of
the main shaft and having a tongued and grooved connection in the cavity of said
frame whereby said sleeve may be removed, and, after being partially rotated, may
reinserted to present its surface more advantageously for wear.
be
5. In a pulverizing mill, the combination of a chamber for receiving material to be
pulverized, a roll arranged to travel around the interior of the same, a perforated or
reticulated screen rising from the said chamber, a shell surrounding the screen and
chamber, a hopper arranged beneath the chamber and having its upper portion
extended beneath the space which is between the chamber and the said shell and a
spiral flange carried by the roll to convey material to the screen.
6. In a pulverizing mill, the combination of a chamber, rolls revolving around the
interior of the same, a main shaft, a head carried by the main shaft and oscillating
bearings connected with said head, receiving shafts upon which the rolls are mounted.
and composed of two parts, the outer of which have shoulders for receiving heads
extending from the roli shafts and the inner of which are longitudinally adjustable
relatively to the outer and internally tapered to fit correspondingly tapered portions
of the roll shaft.
7. In a pulverizing mill, the combination of a chamber, rolls working within the
chamber, shafts carrying the rolls, a hollow main shaft, a head carried by the main
shaft and having radial cavities, bearings for the roll shafts having trunnions provided
with cavities communicating with the cavities of the head and composed of two
sections, the inner of which are adjustable relatively to the outer and are internally
tapered to fit the tapering portions of the roll shafts.
8. In a pulverizing mill, the combination of a hollow main shaft vertically arranged
and provided with a flange, a frame having a part sustaining said flange and a
passage for oil from the interior of said shaft to the space between the collar
and hub.
Dated this 24th day of June 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.