Improvements in or relating to Grinding or Pulverizing Apparatus
Year: 1897

page_text: Date of Application, 3rd Apr., 1897
Complete Specification Loft 1st lan 1898 Accented 19th Mar
1808
PROVISIONAL SPECIFICATION.
Improvements in or relating to Grinding or Pulverizing Apparatus
(A communication by GEORGE R. KING, of New York, in the County and State
of New York, and ALBERT RAYMOND, of Chicago, in the County of Cook and State
of Illinois, both of the United States of America).
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil Engineer, do
hereby declare the nature of this invention to be as follows:-
This mill is of the class in which reducing rollers travel in a vertical path
around the interior of a ring or cylinder, and it is designed to reduce quartz, ores,
lime, gypsum and other materials, whether of a refractory or readily yielding
nature, to a fine powder.
in
The invention consists, aside from various minor details, in three leading
features; first, in a novel manner of mounting and driving rollers which are
more than half the diameter of the ring within which they travel, so that they
act more effectively than the small rollers heretofore employed; second,
arranging the rollers to reciprocate in an axial direction during their travel, so
that they follow serpentine paths over the inner surfaces of the ring, thus equalising
the wear and preventing the formation of channels or gutters, and also improving
the reducing action; and third, in employing rollers of different diameters fixed
on one shaft, so that they have different surface speeds and act with a slipping
action in relation to the surfaces of the rings in which they travel, so that the
material is reduced by a combined crushing and rubbing influence.
The details of the" construction may be widely varied provided the foregoing
characteristics, or either of them are retained.
A horizontal cylinder is fixed on a base plate and provided midway of its length
with a feed hopper on one side. The ends of the cylinder are partly closed by
annular plates bolted thereto and each having an outer flue or passage through
which the fine material may be withdrawn by a fan or other exhaust mechanism
arranged to communicate therewith in any suitable manner.
Within the ends of the cylinder there are secured two vertical hard metal rings
serving as tracks against which the material is crushed by the rollers.
Two of these rollers are located one inside of each ring and both fastened on
one horizontal shaft.
Two similar rollers are fastened on a second shaft and located one in each ring.
The rollers are large and heavy and extend inward past the centre of the rings.
The two rollers in each ring lap past each other, and travel in different paths, so
that they act on different portions of the material.
In order to press the rollers outward against the inner surfaces of the rings,
and to cause them to travel around vertically therein, the shafts are mounted

page_text: in a rotary skeleton frame, sustained and driven at its outer ends. This frame
consists of two strong parallel bars or rods fixed rigidly at their ends to two heads
which are attached respectively to the outwardly projecting shafts or journals
having coincident axis.
The heads are provided with radial guides sustaining sliding boxes in which
the ends of the roller shafts are mounted. Between the two boxes in each head
is mounted a spiral spring tending to force the boxes apart and hold the rollers
outward with yielding pressure towards or against the rings. The shaft at one
end of the driving frame is extended through the tubular journal of a driving
pulley into a chamber therein, where the shaft is provided with a crosshead,
encircling bolts in the pulley. When the pulley is rotated, the bolts cause the
crosshead to rotate, thereby turning the frame and causing the rollers to travel
in a vertical, orbital course around the centre of the rings and against their interior
surfaces. As the bolts extend loosely through the crosshead, the driving frame
is free to move endwise, or in other words in an axial direction, while rotating,
so that the rollers will follow a serpentine or zigzag course within the rings. This
motion is produced by mounting the shaft of the driving frame in a box which
is in turn sustained by horizontal trunnions in an upright skeleton lever sustained
at its lower end on a horizontal axis and connected at its upper end by a pitman
to a crank on the end of a crank shaft sustained by bearings on top of a cylinder.
The rotation of the crank causes the pitman and lever to shift the frame to and
fro and thus the rollers are caused to traverse the irregular path within the rings.
The rotation of the frame and its end motion occur preferably in irregular or
inharmonious periods so that the rollers constantly follow new paths, thus equalising
the wear on the rings so that they remain true and flat and also bringing all
portions of the material under treatment.
The driving pulley has journals sustained in standards. The crank shaft is
connected by bevelled gear to a shaft seated horizontally in bearings on the main
cylinder. This shaft carries an eccentric carrying a pitman adjustably connected
to a lever which is pivoted on a shaft passing through the feed hopper and carrying
a ribbed feed wheel.
This feed shaft carries also on its outer end, a ratchet wheel engaged by a pawl
pivoted to the lever.
Through the above connections, a slow intermittent rotation is imparted to the
feed wheel, and the crude material thereby delivered gradually into the hopper.
To facilitate the passage of this material from the centre laterally under the
rolls, a filling plate may be seated in the bottom of the cylinder, but it is not an
essential feature.
Dated this 2nd day of April 1897
improvements in or relating to Grinding or Pulverizing Apparatus.
(A communication by GEORGE R. KING of New York in the County and State
of New York, and ALBERT RAYMOND of Chicago in the County of Cook and State
of Illinois, both of the United States of America).
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of

page_text: Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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 mill is of the class in which reducing rollers travel in a vertical path
around the interior of a ring or cylinder, and it is designed to reduce quartz, ores,
lime, gypsum and other materials, whether of a refractory or readily yielding
nature, to a fine powder.
The invention consists, aside from various minor details, in three leading
features; first, in a novel manner of mounting and driving rollers which are
more than half the diameter of the ring within which they travel, so that they
act more effectively than the small rollers heretofore employed; second, in
arranging the rollers to reciprocate in an axial direction during their travel, so
that they follow serpentine paths over the inner surfaces of the ring, thus equalising
the wear and preventing the formation of channels or gutters, and also improving
the reducing action; and third, in employing rollers of different diameters fixed
on one shaft, so that they have different surface speeds and act with a slipping
action in relation to the surfaces of the rings in which they travel, so that the
material is reduced by a combined crushing and rubbing influence.
The details of the construction may be widely varied provided the foregoing
characteristics, or either of them, are retained, but in the drawings the construction
considered best for general use has been shown.
Figure 1 is a side elevation of the mill;
Figures 2 and 3, views of the two ends;
Figure 4, a longitudinal, vertical, central section of the left hand side of
Figure 1.
Figure 4 a longitudinal vertical central section of the right hand side of
Figure 1.
Figure 5, a vertical cross section through the middle;
Figure 6 a plan view of the rotary frame to sustain and carry the roller shafts,
the shafts and rollers being indicated in dotted lines;
Figure 7 an end view of the same;
Figure 8 a diagram illustrating the differential speed of the roller surfaces.
The same letters indicate the same parts in all the figures.
A represents a horizontal cylinder fixed on base plate B, and provided midway
of its length with a feed hopper C on one side. The ends of the cylinder are
partly closed by annular plates D bolted thereto and each having an outer flue
or passage. F through which the fine material may be withdrawn by a fan or
other exhaust mechanism arranged to communicate therewith in any suitable
manner.
Within the ends of the cylinder there are secured the two vertical hard metal
rings G G serving as tracks against which the material is crushed by the rollers.
II represent two of these rollers, located one inside of each ring and both
fastened on one horizontal shaft H. The rollers I I are of different diameters
and travel respectively inside of said two rings G G which are also of different
diameters. This is shown more clearly in Figure 8. The surface of one or both
rollers will therefore travel at a speed different to that of the ring against which
it acts. In other words there will be a slipping or rubbing action between each
roller and the surface of the adjacent ring, so that a grinding, rubbing or tritu-
rating is produced.
II represent two similar rollers fastened on the second shaft H' and located
one in each ring, these rollers being also of different diameters for the aforesaid
purposes. It will be perceived that the rollers are large and heavy and that they
extend inward past the centre of the rings. The two rolls in each ring lap past
each other, and travel in different paths, so that they act on different portions of
the material.
In order to press the rollers outward against the inner surfaces of the rings,

page_text: and to cause them to travel around vertically therein, the shafts are mounted
in a rotary skeleton frame, such as shown in Figures 6 and 7, sustained and
driven at its outer ends. This frame K consists of two strong parallel bars or
rodsk fixed rigidly at their ends to the heads and which are attached respec-
tively to the outwardly projecting shafts or journals and having coincident
axis.
in
The heads are provided with radial guides sustaining sliding boxes
which the ends of the roller shafts are mounted, as shown in dotted lines in
Figure 6, and in full lines in Figure 4. Between the two boxes in each head
is mounted a spiral spring k², tending to force the boxes apart and hold the rollers
outward with yielding pressure towards or against the rings G. The shaft ³ at
one end of the driving frame is extended through the tubular journal of a driving
pulley L, into a chamber therein, where the shaft is provided with a crosshead M,
encircling bolts N in the pulley. When the pulley is rotated, the bolts cause the
crosshead to rotate, thereby turning the frame K and causing the rollers to travel
in a vertical, orbital course around the centre of the rings and against their interior
surfaces. As the bolts extend loosely through crosshead M, the driving frame K
is free to move endwise, or in other words in an axial direction, while rotating,
so that the rollers will follow a serpentine or zigzag course within the rings.
This motion is produced by mounting the shaft of the driving frame in a box
which is in turn sustained by horizontal trunnions in an upright skeleton lever O
sustained at its lower end on a horizontal axis and connected at its upper
end by pitman o' to crank o² on the end of shaft sustained by bearings
on top of the cylinder A. The rotation of the crank causes the pitman and
lever to shift the frame K to and fro and thus the rollers are caused to traverse
the irregular path within the rings. The rotation of the frame and its end motion
occur preferably in irregular or inharmonious periods so that the rollers constantly
follow new paths, thus equalising the wear on the rings so that they remain truc
and flat and also bringing all portions of the material under treatment.
The driving pulley L has journals sustained in standards P. The crank shaft o³
is connected by bevelled gear to shaft Q seated horizontally in hearings on the
main cylinder. This shaft Q, carries, as shown in Figure 2, eccentric g, carrying
pitman q, adjustably connected to lever g, which is pivoted on shaft S, passing
through the feed hopper and carrying a ribbed feed wheels, as shown in Figure 5.
This feed shaft carries also on its outer end, a ratchet wheel 3, engaged by a
pawls, pivoted to the lever q².
Through the above connections, a slow intermittent rotation is imparted to the
feed wheel, and the crude material thereby delivered gradually into the hopper.
To facilitate the passage of this material from the centre laterally under the rolls,
a filling plate T may be seated in the bottom of the cylinder, as shown in Figure 5,
but it is not an essential feature.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is:-
1. A grinding mill having one or more rings, a rotary frame, and shafts carried
by the frame and provided with large rollers travelling within the rings sub-
stantially as described.
2. In a mill, the combination of a cylinder or body, rings therein, a rotary
skeleton frame sustained and driven at its ends, and shafts carried by the frame
and provided with overlapping rollers within the rings.
3. A grinding mill wherein one or more reducing rollers are arranged to travel
in a crooked path around the interior of a ring substantially as described and
shown.
4. In a mill, a cylinder or casing and rings therein, in combination with rollers
travelling within the rings, a driving frame sustaining and carrying the roller

page_text: shafts, springs to force the shafts and rollers outward, and mechanism to move
the driving frame to and fro in an axial direction.
5. In a grinding mill, the combination of rings or grinding surfaces, with a
travelling shaft carrying reducing rollers proportioned as described to slip or slide
in passing over the ring surfaces.
6. In a grinding mill, a travelling shaft carrying two rollers of different
diameters, in combination with two rings of different diameters but coincident
axes wherein the rolls travel, whereby a slipping or sliding action of the rolls is
secured.