Year: 1888

page_text: Date of Application, 25th Jan., 1888
Complete Specification Left, 25th Oct., 1888
Complete Specification Accepted, 14th Dec., 1888
I EDWIN COLVER GRIFFIN, of New York United States of America, Engineer, do
hereby declare the nature of the said invention to be as follows :—
My present invention relates to that class of pulverizing mills in which the reduc-
tion or pulverization of ores and other substances is accomplished by the revolution of
one or more rollers within and against the inner wall of an annular die or ring, and
in which the said rollers are held in contact with the annular dies or rings by centri-
fugal force when the mills are in operation; and it consists of certain improvements
in the construction and arrangement or combination of the parts of the ore pulverizing
mill, for which Letters Patent were granted to Edwin Packard the 15th day of October
A.D. 1886 and numbered 13162 (being a communication to him from abroad by Edwin
Colver Griffin of New York, in the United States of America.
The object of my invention has been the production of a mill in which ores and
other substances, however refractory and of whatever degree of hardness, may be
rapidly, cheaply and thoroughly crushed and pulverized, or reduced to an almost
impalpable powder.
The essential features of my present improvements on the ore pulverizer described
and shewn in the said former Letters Patent consist; first, of a modification or change
of construction in the main central carrier which receives and discharges the material
to be pulverized, in which the rollers are mounted and by which the pulverized material
is elevated for being discharged by which modification greater strength and efficiency
and better operation of the parts are secured; second, of a change in the construction
of the devices for securing and driving the spindles on which the rollers rotate; third
of the construction and relative arrangement of the rollers, the annular die or ring, the
material discharging devices, the cover the receiving trough and the sweep therein,
whereby the material is more thoroughly pulverized and more rapidly and efficiently
delivered from the mill; fourth, of the construction and substitution of an annular die
or ring in sections or three parts in lieu of the solid one heretofore employed, whereby

page_text: wear is lessened and greater facility secured in holding it in place and in removing
and replacing it when necessary; and, fifth, of providing the revolving central carrier
with vanes or wings and the stationary part of the mill with air ducts or channels,
whereby air currents are caused to circulate within the cover and raise and discharge
the sufficiently pulverized material without causing the fine dust to escape into the
room or building in which the mill may be operated.
The improved mill consists of a casing or pan which encloses the ring or annular
die, the grinding rollers, and the elevating mechanism, and is provided with a number
of openings which extend through its whole depth and which are arranged outside the.
die, and are adapted to convey the ground or pulverized material to the receiving
trough.
A horizontal annular plate or ring is bolted to the top of the casing or pan and in con-
nection with an annual shoulder a sufficient distance below it, upon the said casing or pan,
serves to firmly secure the grinding die or ring in operative position. This die is
composed of three separate rings, of which the inner one is the wearing, removable and
renewable ring, whilst the two outer ones are fitted to corresponding bevilled faces of
the said inner ring, so that by drawing or pressing thien together, by screw bolts and
nuts or wedges, or other ordinary suitable means, the said inner ring will be securely
but removably held in place.
The housing or cover of the mill is composed of three parts, the screen frames, the
top portion, and an outer inclined or conical part. These parts are removably secured
together and to the pan, and the annular plate upon the latter already described
by bolts.
The combined roller carrier, feed distributor and elevator, is cast in one piece and is
secured to and driven by a central vertical driving shaft and is formed with an annular
web or plate, provided with semicircular recesses or pockets, in which the grinding
rollers freely rotate, a feed direction shell provided with openings being arranged to
deliver the material in front of each roller, and an elevating device being also arranged
beneath the rollers and provided with a series of inclines connected together in circular
or disc form, the inclined faces thereof being made of chilled iron or other hard metal
plates and adapted to be easily removed and renewed. This circular disc with its
inclined surfaces is made of smaller diameter than the interior surfaces of the ring or
annular die, so that during its rotation it will operate to throw the material upwardly
against the inner surface of the said die and above the same. On this circular disc or
elevating device are also formed small horizontal surfaces, which act as supports for
the rollers when the mill is not in operation.
The grinding rollers may be made either in parts, having removable shells, or they
may be anade solid. In either case they are provided with supporting bosses on their
under sides which rest on the horizontal surfaces already described and with extensions
on their upper sides which reach up into and are covered by drivers which also serve
as hoods. The joints between these parts are packed by leather or other suitable
washers which prevent dust or grit from gaining access to the journals.
The rollers are also provided with gun metal or other suitable bushes, in which the
spindles work freely also in the upper or extended part of each roller is formed a
recess, for collecting surplus oil, and preventing it from coming in contact with the
ground material. The spindles on which the rollers rotate are fastened in the com-
bined drivers and boods or dirt protectors already described, which are used in place
of the swinging arms described and shewn in the specification of the former patent
already referred to. These spindles are further secured at their upper ends by ball and
socket joints to a top frame which is fixed to the main central carrier, the balls being
formed on or secured to the spindles, and the sockets being made in two parts and
secured in the said top frame by wedges or other convenient means.
In the rear of the semicircular pockets and secured to the main carrier are elastic or
other pushing pieces, mounted upon bosses secured to the main carrier, against which
press drivers upon the spindles of the rollers and upon the faces of which the said
spindle drivers may freely rotate as the rollers move in and out toward and from the
centre of the machine, when the mill is in operation.

page_text: The rollers, spindles, and drivers are not perpendicularly arranged, but the lower
part of each of them is slightly in advance of its top. This inclination of the spindles
causes the rollers when in motion, to rise from the horizontal supports already
described, and to constantly maintain their position solely by their centrifugal force
and adhesion to the die or ring.
A sweep or circular conveyor rotates in a circular trough below the grinding pan,
being secured to and driven by the main vertical driving shaft, and carrying the
pulverized material round and discharging it through a spout.
In a modified form of the machine the swinging arms and spindles described and
shewn in the specification of the former patent already referred to are combined with
parts of the present invention.
Inside the cover of the machine a circular ring of sheet metal is secured to the plate
or ring already described which is bolted to the top of the pan. A secondary or
internal cover is secured to the top of the cover and consists of a hood and an inner
ring secured thereto, the said hood and ring respectively projecting downwardly out-
side and inside of the upwardly projecting ring of sheet metal just described and, in
connection therewith and with the outer cover forming ducts or passages for the air
currents generated in the mill and operating to elevate and separate the lighter or
sufficiently pulverized material from the heavier or unpulverized particles. An opening
is formed in the upper portion of the hood, and over this opening is arranged a plate
or valve, which is adjustably secured to the outer cover by screws and can be adjusted
to regulate the intensity of the air currents passing, down through the opening and
back into the interior of the mill. The air currents are produced by wings or vanes
upon the revolving centres which are arranged in front of the rollers, the said wings
or vanes, when the mill is in operation, causing the air currents to circulate within
the mill.
As the air currents are prevented from escaping by the outer cover, no fine and
often deleterious dust is carried out into the room or building in which the mill may
be operated.
The operation of the improved mill is as follows:
The material to be ground or pulverized, being introduced through a hopper by any
suitable feeding device, falls within the revolving feed directing or distributing shell
and to the bottom thereof, from which it is thrown out by centrifugal force through
the openings, and discharged against the annular die immediately in front of the
rollers and is by them crushed or pulverized. It then falls upon the elevating inclines
beneath the rolls, and is by them directed or thrown upward across the face of the die
and against the screens, wlien the latter are employed.
Such portions of the material as are sufficiently pulverized or fine pass out through
the screens and fall downward through openings into the circular receiving trough,
below the pan from which they are driven out by the sweep or conveyor through the
discharge spout.
The material which does not pass through the screens falls back upon the top and
across the face of the die and is again acted upon by the rollers. By this means, the
feed being evenly distributed upon the die, and the ground material being driven from
the mill as fast as produced, the greatest possible amount of work is accomplished by
a given number of rollers.
As the ground material does not strike the screens at right angles, but at a tangent
or inclination, the wear on the screens is comparatively small, and a much finer pro-
duct is obtained than the meshes of the screens would indicate.
For wet grinding it is only necessary to introduce the required amount of water as
the operation is otherwise the same as for dry grinding the journals being protected
by dust and waterproof packing.
The construction, arrangement and operation of the feeding, grinding or pulverizing
and elevating mechanisms of the mill when screens are not used are the same as in the
mill in which the screens are employed, but the delivery or discharge of the material
therefrom is different. The pulverized material when thrown up by the inclines follows
the same course as when discharged through the screens, but, instead of striking the

page_text: screens, it is thrown against the upwardly extending ring already described when such
of the material as is sufficiently fine will be carried by the air currents, produced by
the wings or vanes over the said ring and downward under the edge of the hood then
as the current of air rises again between the said hood and the outer cover of the mill
the greater portion of the ground material will drop out of the air currents pass down
through the openings in the pan and be discharged from the mill in the same manner
as when delivered through the screens. By raising or lowering a plate or valve the
size of the air opening can be varied and, consequently, the strength of the current of
air can be increased or decreased, and thus the fineness of the product discharged
regulated.
In order to hold the rollers in their proper position for grinding and at the same
time to allow them a sufficient amount of movement when in operation, I sometimes
make the spindles upon which they turn elastic.
For this purpose each roller may be provided with a central bush fitting upon the
lower end of a spindle or bar of steel or other sufficiently elastic suitable material.
The upper end of this spindle, after leaving the roller is bent horizontally and is then
formed into one or more helical coils, its end being then bent down and fitting into a
socket in the pushing or driving pieces by which the rollers are driven round.
The rollers are provided with projecting ends and hoods to keep out dust, as already
described. A perfectly clastic connection between the roller and the driver is thus
obtained.
Dated thie 95th day January 1800

page_text: Improvements in Machinery for Pulverizing Ores or other Hard
Substances.
I, EDWIN COLVER GRIFFIN, of New York, United States of America, 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 and accompanying drawing, (that is to say)
:~
My present invention relates to that class of pulverizing mills in which the
reduction or pulverization of ores and other substances is accomplished by the
revolution of one or more rollers within and against the inner wall of an annular die
or ring, and in which the said rollers are held in contact with the annular dies or
rings by centrifugal force when the mills are in operation; and it consists of certain
improvements on the construction and arrangement or combination of the parts of the
ore pulverizing mill for which Letters Patent were granted to Edwin Packard dated
the 15th day of October A.D. 1886, and numbered 13162 (being a communication to
him from abroad by Edwin Colver Griffin of New York, in the United States of
America).
My invention has for its object the production of a mill in which ores and other
substances, however refractory and of whatever degree of hardness, may be rapidly,
cheaply and thoroughly crushed and pulverized, or reduced to an almost impalpable
powder.
The essential features of my present improvements on the ore pulverizer described
and shewn in the said former Letters Patent consist, first; of a modification or change of
construction in the main central carrier which receives and discharges the material to
be pulverized, in which the rollers are mounted and by which the pulverized material
is elevated for being discharged, by which modification greater strength and efficiency
and better operation of the parts are secured; second, of changes in the construction
of the devices for securing and driving the spindles on which the rollers rotate; third,
of the construction and relative arrangement of the rollers, the annular die or ring,
the material discharging devices, the cover the receiving trough and the sweep
therein, whereby the material is more thoroughly pulverized and more rapidly and
efficiently delivered from the mill; fourth, of the construction and substitution of an
annular die or ring in sections or three parts in lieu of the solid one heretofore
employed, whereby wear is lessened and greater facility secured in holding it in place
and in removing and replacing it when necessary; fifth, of providing the revolving
central carrier with vanes or wings and the stationary part of the mill with air ducts
or channels, whereby air currents are caused to circulate within the cover and raise
and discharge the sufficiently pulverized material without causing the fine dust to

page_text: escape into the room or building in which the mill may be operated. Sixth, of
providing an elastic connection between the rollers and their drivers, and, Seventh,
of providing facilities for lubricating the rollers.
In the accompanying drawings, wherein the same letters of reference indicate the
same or corresponding parts.
Figure 1 represents a vertical section of the mill, taken on the angular dotted
line of figure 2.
Figure 2, a plan view of the mill, a portion of the cover being removed and interior
parts shewn in dotted lines.
Figure 3 a vertical section through the centre of the upper portion of the stationary
part of the mill, the revolving part thereof being shewn in side elevation.
Figure 4, a vertical section through the cover, the pan or casing and the revolving
carrier, showing the construction and arrangement of the parts for generating air
currents for separating and delivering the pulverized material from the mill.
Figures 5 and 6 respectively, a plan view, with a portion of the cover removed and
interior parts shown in dotted lines and a vertical section, with parts in side elevation,
of a mill embodying my present improvements in combination with the "swinging
arms employed in the mill disclosed in the former patent.
23
Figures 7 and 8 respectively, a plan and vertical section of part of the mill, shewing
an elastic connection between the driver and the grinding roller,
Figures 9 and 10 respectively a vertical section and plan, showing the connection
between the driver and roller made hollow and used for lubricating purposes.
The improved mill consists of a casing or pan which encloses the ring or annular
die B, the grinding rollers C, and the elevating mechanism D, and is provided with a
number of openings b, which extend through its whole depth and which are arranged
outside the die, and are adapted to convey the ground or pulverized material to the
receiving trough E.
F is a horizontal annular plate or ring bolted to the top of the casing or pan and, in
connection with an annular shoulder a sufficient distance below it, upon the said
casing or pan, serves to firmly secure the grinding die or ring B in operative position.
This die is composed of three separate rings, of which the inner one is the
wearing, removeable and renewable ring, whilst the two outer ones 63 and 64 are fitted
to corresponding bevelled faces of the said inner ring, so that by drawing or pressing
them together, by screw bolts and nuts or wedges, or other ordinary suitable means,
the said inner ring will be securely but removably held in place.
The housing or cover G of the mill is composed of three parts-the screen frames g,
the top portion g', and an outer inclined or conical part g². These parts are
removably secured together and to the pan A, and the annular plate F upon the latter
already described by bolts g³.
The combined roller carrier, feed distributor and elevator H is cast in one piece and
is secured to and driven by a central vortical driving shaft I and is formed with an
annular web or plate h, provided with semi-circular recesses or pockets ', as shewn in
Figure 2, in which the grinding rollers C, freely rotate, a feed direction shell J
provided with openings being arranged to deliver the material in front of each roller,
and an elevating device being also arranged beneath the rollers and provided with a
series of inclines d, connected together in circular or disc form, the inclined faces
thereof being made of chilled iron or other hard metal plates and adapted to be easily
removed and renewed.
This circular disc with its inclined surfaces is made of smaller diameter than the
interior surface of the ring or annular die, so that during its rotation it will operate
to throw the material upwardly against the inner surface of the said die and above
the same.
On this circular disc or elevating device are also formed small horizontal
surfaces d', as shewn in figures 3 and 6, which act as supports for the rollers when the
mill is not in operation.
The grinding rollers C may be either made in parts, having removeable shells, as
shewn in the drawing, or they may be made solid.
In either case they are provided with supporting bosses c, on their under sides

page_text: which rest on the horizontal surfaces already described, and with extensions c¹, on
their upper sides which reach up into and are covered by the combined drivers which
also serve as hoods K. The joints between these parts are packed by leather or
other suitable washers which prevent dust or grit from gaining access to the
journals.
The rollers are also provided with gunmetal or other suitable bushes c³, in which
the spindles work freely; also, in the upper or extended part of each roller is formed a
recess, for collecting surplus oil, and preventing it from coming in contact with the
ground material. The spindles con which the rollers rotate are fastened in the
combined drivers and hoods or dirt protectors K already described, which are used in
place of the swinging arms described and shewn in the specification of the former patent
already referred to. These spindles are further secured at their upper ends by ball
and socket joints to a top frame L which is fixed to the main central carrier, the
balls cª, being formed on or secured to the spindles, and the sockets c² being made
in two parts and secured in the said top frame by wedges or other convenient
means.
In the rear of the semicircular pockets ¹, and secured to the main carrier H are
elastic or other pushing pieces M mounted upon bosses m secured to the main carrier,
against which press drivers K. upon the spindles of the rollers, and upon the faces of
which said spindle drivers may freely rotate as the rollers move in and out toward
and from the centre of the machine, when the mill is in operation.
The rollers, spindles, and drivers are not perpendicularly arranged, but the lower
part of each of them is slightly in advance of its top. This inclination of the spindles
causes the rollers when in motion, to rise from the horizontal supports d' already
described, and to constantly maintain their positions solely by their centrifugal force
and adhesion to the die or ring B.
A sweep or circular conveyor N rotates in a circular trough E below the grinding
pan, being secured to and driven by the main vertical driving shaft, and carrying the
pulverized material round and discharging it through a spout O.
In figures 5 and 6, of the drawing the swinging arms and spindles described and
shewn in the specification of the former patent already referred to, are shewn combined
with parts of the present invention.
Inside the cover of the machine, as shewn in figure 4, a circular ring of sheet
metal P, is secured to the plate or ring F, already described which is bolted to the
top of the pan.
A secondary or internal cover is secured to the top of the cover G, and consists of a
hood 9: and an inner ring q' secured thereto the said hood and ring respectively
projecting downwardly outside and inside of the upwardly projecting ring P of sheet
metal just described and, in connection therewith and with the outer cover G, forming
ducts or passages for the air currents generated in the mill and operating to elevate
and separate the lighter or sufficiently pulverized material from the heavier or
unpulverized particles. An opening is formed in the upper portion of the hoody,
and over this opening is arranged a plate or, valve 73, which is adjustably secured to
the outer cover by screws q, and can be adjusted to regulate the intensity of the air
currents passing down through the opening and back into the interior of the mill.
The air currents are produced by wings or vanes R upon the revolving centre, figure 4,
which are arranged in front of the rollers, the said wings or vanes, when the mill is in
operation, causing the air currents to circulate within the mill, in the directions
indicated by the plain arrows in figure 4. As the air currents are prevented from
escaping by the outer cover, no fine and often deleterious dust is carried out into the
room or building in which the mill may be operated.
The operation of the improved mill is as follows:-
The material to be ground or pulverized, being introduced through a hopper 9³, by
any suitable feeding device, falls within the revolving feed directing or distributing
shell J and to the bottom thereof, from which it is thrown out by centrifugal force through
the openings, and discharged against the annular die B, immediately in front of the
rollers (, and is by them crushed or pulverized. It then falls upon the elevating

page_text: inclines d, beneath the rollers, and is by them directed or thrown upward across the
face of the die and against the screens, when the latter are employed. Such portions
of the material as are sufficiently pulverized or fine pass out through the screens and
fall downward through openings & into the circular receiving trough E below the pan,
from which they are driven out by the sweep or conveyor N through the discharge
spout O. The materials which does not pass through the screens falls back upon the
top and across the face of the die and is again acted upon by the rollers. By this
means, the feed being evenly distributed upon the die, and the ground material being
driven from the mill as fast as produced, the greatest possible amount of work is
accomplished by a given number of rollers. As the ground material does not strike
the screens at right angles, but at a tangent or inclination, the wear on the screens is
comparatively small, and a much finer product is obtained than the meshes of the
screens would indicate.
For wet grinding it is only necessary to introduce the required amount of water as
the operation is otherwise the same as for dry grinding, the journals being protected by
dust and water proof packing.
The construction, arrangement and operation of the feeding, grinding or pulverizing
and elevating mechanisms shewn in figure 4, of the drawing are the same as in the mill
in which the screens are employed, but the delivery or discharge of the material
therefrom is different. The pulverized material when thrown up by the inclines
follows the same course as when discharged through the screens, but, instead of
striking the screens, it is thrown against the upwardly extending ring P already
described, when such of the material as is sufficiently fine will be carried by the air
currents, produced by the wings or vanes R, over the said ring and downward under
the edge of the hood y, then as the current of air rises again between the said hood
and the outer cover 6 of the mill the greater portion of the ground material will drop
out of the air currents, follow the direction of the feathered arrows, pass down through
openings b, in the pan a and be discharged from the mill in the same manner as when
delivered through the screens. By raising or lowering the plate or valve y³, the size
of the air opening 2² can be varied and, consequently, the strength of the current of
air can be increased or decreased, and thus the fineness of the product discharged
regulated.
In figures 7 and 8, 1 indicates the annular die or ring which is made of steel and
supported in the casing of the machine in the usual or any suitable manner.
The crushing or pulverizing rollers 2 are preferably cylindrical in form, but they
may be of other shape, according to the desired configuration or angle of the inner
wall of the die against which they work, and they are formed with axial bores which
terminate slightly above their lower ends, and within which are inserted linings or
bushings, which extend from the upper to near the lower ends of said rollers.
The upper ends of the rollers are formed with central projections or necks, 4, which
are of the form of truncated cones and surround the upper ends of the axial bores and
bushings. Fitted over these necks and securely fastened to the journal spindles of the
rollers are hoods 5 which form shoulders against which the rollers work when in
operation amd steady the same and also, they serve to protect the spindles and journal
bearings from dirt and water.
The rollers are mounted with their axial bores upon the downwardly projecting
journal spindles 6 of the roller support which are formed at their inner ends with
similar downwardly projecting spindles 7, which are journaled in the sockets 8 in the
brackets of the revolving centre or driver.
The journal spindles 6 are each formed with a channel 9, which is enlarged at its
lower end to form a chamber, and with a lateral duct 10, at its upper end, which
extends out through the circumference of the spindle and connects with a metal tube 11
which is secured in an opening in the hood 5. To this tube is removably attached an
elastic pipe which leads outside of the shell or casing and is adapted to receive a
lubricant and properly deliver the same through the channel 9 for lubricating the bore
of the roller, the journal spindle and the lining or bushing; or, if preferred,
the elastic pipe may be omitted or removed and the lubricant supplied directly

page_text: through the tube 11 from an oil can or reservoir attached to the hood 5 or other
suitable support.
The roller supports 6 and 7 are preferably made of rods of spring steel, which are
bent along their middle portions into coils, their ends being formed respectively into
the journal and pivotal spindles 6 and 7. This is the preferred form, but it is evident,
that modifications may be made in the construction and arrangement of the parts
thereof without departing from the principle.
When the centre or driver is revolved the rollers will be swung outward by
centrifugal force against the inner wall of the annular die and crush or pulverize
whatever material may be fed between them; also, while the pivotal spindles of the
roller-supports will be firmly held in proper position in the socketed brackets, the
journal spindles, by the elasticity of the spring coils, will be free to move or yield in all
directions and adinit of the rollers assuming varying positions with respect to the
inner face of the ring or die, thereby not only causing proper operation of the said
rollers in crushing or grinding, but preventing the breakage of said roller supports or
the spindles, the rollers, the socketed brackets or the arms of the revolving centre or
driver, in the event of the rollers coming into contact with any foreign or irreduciable
substance. These spring coils are not employed for the mere purpose of forcing the
rollers against the annular die or ring, as the centrifugal force of the rollers, as they
are thrown outwardly by the revolving centre or driver, is sufficient for this purpose,
but they serve to cushion said rollers, to prevent all jarring of the working parts of the
machine and consequent breakage, to prevent uneven wear upon the main or driving
shaft and the journal and pivotal spindles, and also, to provide a universally moveable
or flexible connection between said spindles, which will admit of the same and the
rollers assuming various angles with respect to each other and this without causing
uneven wear upon the bushings of the rollers, the spindles or the sockets of the brackets
upon the revolving centre or driver.
During the operation of the rollers, or while they are moved round by the revolving
centre or driver, they will rise slightly upward upon their journal spindles, from the
fact that the lower ends of said spindles are slightly in advance of their upper ends,
and, when said centre or driver and rollers are not in operation, the latter will
descend and rest upon the supports 13 of the horizontal extensions of the brackets:
The hoods 5 arranged over the necks of the rollers, prevent dirt and water from
entering between the spindles and the journal bearings in the bores of the rollers;
also, a lubricant may be supplied from the outside of the mill-casing to the chambers
in the spindles through the elastic or flexible pipes, the metal tubes and the axial
channels in the said spindles or said spindle chambers may be supplied with lubricant
through said metal tubes by removing the plugs therefrom, when the flexible pipes
are not used and when the rollers are not in operation.
An advantage is incident to these constructions of roller-supports which is not
possessed by mills or pulverizers of this class in which the roller spindles are suspended
from their upper ends. With the improved roller-supports the rollers will, at all times,
present their peripheries parallel to the inner wall of the ring or die, this being being
due to their capability of movement to and from said die in the plane of their revolution,
whereby they crush or grind evenly along their entire lengths, whereas in mills or
pulverizers in which the roller spindles are suspended from their upper ends, the lower
ends of the rollers will be swung further outward than their upper ends, forming
increasing angles with the inner wall of the ring or die and, thereby, will crush or
grind more finely with their lower than with their upper portions.
I am aware that it is not new in this class of mills or pulverizers to hold spindles
and their rollers against dies by springs, so as to secure a yielding pressure, and I
do not claim the same; but I am not aware that a roller support provided with
a springy or yielding journal spindle has been attached to a revolving center or driver
for the purpose of securing an elastic connection between the latter and the roller and
its spindle, so that the strain upon said spindle may be lessened and the wear upon
the same and the bushing of the roller reduced.
I do not rely upon the universally movable or yielding journal spindle of the
B

page_text: coller-support to hold the roller against the die, as I depend entirely upon centrifugal
orce for this purpose, when the mill is in operation. It is true that each roller
support and its connections will develop centrifugal force when in operation and
cause pressure against the roller bushing, but this pressure is eased and rendered
less destructive by means of the elasticity incident to the journal spindle of said
roller-support. It is possible to so adjust the roller support with respect to the
revolving center or driver as to hold the roller away from the die for a distance about
sufficient to counteract the amount of centrifugal force that will be developed in the
journal spindle and its connections, when in action, and thus said roller, its spindles
and bushing will be relieved from the detrimental action or wear that is incident to
such force. In this manner the roller will only press against the die with the pressure
which is due to its own centrifugal force, which is a very desirable result to be
obtained, as then the only strain upon the roller-support and its spindles and bearings
will be due to the force necessary to propel the same, which is less than that due
to the centrifugal force developed by and passed outward from the journal spindles
and their attachment.
In Figures 9 and 10 the connection between the driver and the roller is shewn
rigid, but is made hollow at 14 so as to serve as an oil chamber. Oil can be supplied
at 15 through the spindle of the driver whence it passes by a lateral channel into the
chamber 14 and thence through a lateral opening 16 into the hollow spindle of the
roller 2. An opening and plug are shewn at 17 by which access can be got or oil also
supplied to the chamber 14.
Having now particularly described and ascertained the nature of my said Inven-
dion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. In a pulverizing mill, the casing or pan, the ring or annular die and the crushing
or pulverizing rollers, in combination with the revolving centrally-arranged carrier
provided along its upper portion with a feed receiving and distributing shell having
openings arranged to deliver in front of the rollers and also provided with an annular
web or plate arranged beneath said shell and formed with pockets for the rollers, and
with a disc or circular shaped lower end provided with inclined elevating faces and
horizontal supporting surfaces, said carrier and its parts being integrally formed,
substantially as described.
2. In a pulverizing mill, the combination of the casing or pan, the ring or annular
die, the crushing or pulverizing rollers rotating within and against said die, the
spindles upon which the rollers are mounted and the revolving carrier, said spindles
being connected at their upper ends to said carrier by ball and socket joints, substan-
.tially as described.
3. In a pulverizing mill, the combination of the casing or pan, the ring or annular
die, the revolving centre provided with the pushing blocks, the rollers provided with
upward extensions, and the combined hoods and drivers, which freely rotate against
said pushing blocks as the rollers move in and out toward the centre of the machine,
substantially as described.
4. In a pulverizing mill, the combination of the casing or pan, the ring or annular
die, the crushing or pulverizing rollers, the spindles, the carrier to which said spindles
are secured at their upper ends by ball and socket joints, the elastic pushing blocks
secured to said carrier, and combined hoods and drivers which roll in and out to and
from the centre of the mill against said pushing blocks, substantially as described.
5. In a pulverizing mill, the combination of the casing or pan, the ring or annular
die, the rollers and the revolving center provided with the semi-circular pockets in
which the rollers rotate, with the pushing pieces, with a feed directing shell having
the discharge openings and with a set of inclines by which the material is thrown
upward across the die and discharged from the mill, substantially as described.
6. In a pulverizing mill, the combination of the casing or pan, the annular die
composed of an inner wearing ring, and two outside strengthening and binding rings,
and the crushing or pulverizing rollers, substantially as described.

page_text: 7. In a pulverizing mill, the combination of the casing or pan, the annular die, the
revolving centre provided with horizontal supports, as described, and the spindles
and rollers arranged at an incline from the perpendicular, whereby when in operation
said spindles and rollers rise from said supports and remain in operative position
against said die by centrifugal force and their adhesion thereto, substantially as
described.
8. In a pulverizing mill, the combination of the casing or pan, the annular die, the
revolving carrier having horizontal supports formed on its lower portion and provided
with a horizontal fraue at its top, the rollers and the spindles having bosses at their
lower ends and, together with the rollers, being arranged at an inclination from the
perpendicular and secured to said top frame by ball and socket joints, substantially as
described.
9. In a pulverizing mill, the combination of the casing or pan, the ring or annular
die and the rollers rotating within and against the same, with a revolving circular disc
or carrier arranged below said die and provided with inclined surfaces arranged in a
vertical line falling inside of the interior surface of the die, for the purpose of throwing
material against the die and above it, substantially as described.
10. In a pulverizing mill, the combination of the casing or pan, crushing or
pulverizing mechanism, and an inner revolving part provided with vanes or wings,
with an outer stationary cover, an inner cover and the upwardly projecting ring, said
parts being so arranged that, by the revolution of said inner part and its vanes or
wings, currents of air are caused to circulate within the mill and carry away
or discharge the sufficiently pulverized material without permitting air and fine dust
to escape, substantially as described.
11. In a pulverizing mill, the combination of the crushing or pulverizing mechanism,
and the revolving centre provided with wings or vanes, of the upwardly projecting
ring, the outer cover, the internal cover, consisting of an outer hood and an inner
ring secured thereto and projecting, respectively, outside and inside of the ring first
named, and the casing or pan provided with downwardly leading openings, substan-
tially as and for the purpose described.
12. In a pulverizing mill, the combination of the crushing or pulverizing mechanism,
and the revolving centre provided with wings or vanes, of the upwardly projecting
ring, the outer cover, the internal cover, consisting of an outer hood and an inner
ring secured thereto and projecting, respectively, outside and inside of the ring first
named and formed with an inlet opening in its top, an adjustable plate or valve
arranged over said opening, and the casing or pan provided with downwardly leading
openings, substantially as and for the purpose described.
13. In a pulverizing mill, the combination of the crushing or pulverizing mechanism,
and the revolving centre provided with wings or vanes, of the upwardly projecting
ring, the outer cover, the internal cover, consisting of an outer hood and an inner
ring secured thereto and projecting, respectively, outside and inside of the ring first
named, and the casing or pan provided with downwardly leading openings, the
trough, and the sweep, substantially as and for the purpose described.
14. In a pulverizer, the combination; with a ring or an annular die and a revolving
center or driver, of a roller support pivoted to said revolving centre or driver and
provided with a universally yielding journal spindle, and a roller mounted upon said
spindle, substantially as described.
15. In a pulverizer, the combination, with a ring or an annular die and a revolving
center or driver, of a roller support provided with a universally-yielding journal spindle
and, also, with a pivotal spindle arranged parallel to the axis of said revolving centre
or driver, the pivotal spindle being pivoted to said center or driver and the journal
spindle having a roller mounted thereon, substantially as described.
16. In a pulverizer, the combination with the ring or annular die, the driving shaft,
the revolving center, the brackets formed with vertical sockets S and extensions having
the supports 13, of the roller supports provided with the universally-yielding
springs 12 and with the pivotal spindles 6 and journal spindles 7, and the rollers 2,

page_text: which are formed with the central bores, closed at the lower ends, and which are
mounted upon said journal spindles and the lubricating apparatus substantially as
described and shewn in figures 7 and 8.
17. In a pulverizer, the hollow driving arm for the rollers, serving as an oil
chamber, and communicating with the hollow spindle of the roller, substantially
as described and shewn in figures 9 and 10:
D1 5+1 d of Antalian 1000