Year: 1888

page_text: Date of Application, 6th Mar., 1888
Specification Accepted, 4th May, 1888
I, GIDEON FRISBEE, Engineer, a citizen of the United States, residing in the
City County and State of New York, United States of America, do hereby declare
the nature of my said invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
Similar letters of reference indicate corresponding parts in all the figures of the
drawings.
Figure 1 illustrates a vertical longitudinal section of my improved mill, parts of the
casing on one side of the mill being retained. Figure 2 illustrates a transverse vertical
section through the mill on the line x. x, Figure 1. Figure 3 shows the mill in
perspective, parts being broken away, and Figures 4, 5 and 6 detail parts thereof.
Referring to Figure 1, F is the main driving shaft of the mill connected with a
suitable source of power through the pulley F. Keyed to this shaft are a pair of
arms O. O, one in each side of the machinery. The shafts G. G carry the pulverizing
rollers D. D. These shafts G at each end are carried in journal-boxes P P, which
sit in the slots S S in the arms O, which permit said journal-boxes to have a longi-
tudinal motion in said slots, allowing them to approach and retreat from the central
shaft F. RR are set-screws which limit the amount of the longitudinal movement
of said journal-boxes in said slots. Between said journal-boxes and the outer ends of
the slots S, are springs T, which retard the approach of said journal-boxes towards
the set-screws R, and thus decrease the pressure of the pulverizing rollers on the
pulverizing ring, as will be hereinafter more fully described.
.B, is the casing of the mill inclosing the grinding rings, rollers, sieves and other
operating parts of the mill. This casing and the grinding ring C, are stationary and
are both attached to the bed-plate A. At each end of the casing B, is a disc N,
keyed to the shaft F' and forming a head piece for said casing. Through slots in these
head-pieces the roller shafts G G pass. Keyed to said shaft F, inside of said head-
pieces is a frame N' carrying a suitable sieve. This frame is also slotted to permit
the shafts G to pass through it and not to interfere with their longitudinal motion in
the slots on the arms O. Attached to the shafts G is a disc L, which covers the slot
in the frame N¹ and prevents the egress of the semi-pulverized material through said
slots before it is ready to be discharged from the mill. Attached to the main shaft F.
are. the distributing fans E E having flanges b and c which catch the ore or other

page_text: material as it enters the mill through the hopper u and throw it into the path of the
revolving pulverizing rollers against the pulverizing ring. Arranged at suitable
intervals along the edge of the sieve frames N', are fans M, working in V grooves in
the casing to catch the ore which is too large to pass through the finer sieve and
which by centrifugal action has been thrown in their path, casting it back to be
further reduced between the pulverizing ring and rollers, and preventing leakage at
that point. The form of sieves which I prefer to employ are further illustrated in
figs. 4, 5 and 6. I (figs. 5 & 6) is a coarse sieve of strong wire placed inside of the
finer sieve, to protect it from injury. This coarser screen is supported on a frame
smaller than the frame N of the finer sieve and is set a distance in front of it. Any
material which passes through the larger sieve, but is not able to pass through the
meshes of the outside sieve, is thrown by centrifugal force into the path of the fans M,
by which said material is cast back into the mill and further pulverized. A thimble K
attached to the frame N¹ is made long enough to extend through the coarser sieve
and the disc L attached to the shafts G, is set immediately in front of the end of said
thimble. Similar discs L, may be fixed to the shafts G G in front of the slotted
disc N, said cylindrical pieces or discs in each case operating to throw the ore away
from the slotted openings by centrifugal force and preventing leakage at that point.
The ore when sufficiently pulverized passes through the sieves into the chainber
between the outer sieve and the disc N, and finally passes out of the mill through the
passage W. T is a set-screw by means of which the ring C is held in place and is
adjusted.
The operation of my improved machine is the following:-Power is applied to the
pulley and the arms 0 0, slotted discs N N, slotted sieves N' and the crushing
rollers D, all attached to the central shaft F, are caused to revolve. By centrifugal
force the journal-boxes P, carrying the shafts G G are thrown outward until they are
stopped by the set-screws R, or are cushioned against the springs T¹, the force of the
springs overcoming the centrifugal force of the journal-boxes. Ore or other material
to be crushed, is fed into the hopper at the top of the machine and descending is
caught by the fans E which throw it into the path of the rollers, while the guide
flanges c form a channel and confine the rock to the face of the ring, until the rollers
reach it. The action of said fans also causes a strong draught of air into the
casing through the hopper and out through the sieves and discharge passages,
carrying with it the material which has been pulverized to a sufficient degree to
enable it to pass through the meshes of the outer and finer sieve.
By means of the set-screws R the rollers can be prevented from coming in close
contact with the pulverizing ring, if desired, for granulation of ores. By means of
the spring T the centrifugal force of the rollers on the pulverizing ring can be
diminished, if necessary, in reducing soft materials. By means of the slots in the
arms the rollers have a free movement away from the ring and towards the central
shaft to permit their passage over hard substances that they have not sufficient force
to crush at once.
In a mill such as herein before described it will be observed that only the ring and
crushing rollers are contained in the interior of the mill, thus giving more room in
the working parts of the mill, all the other parts off the mill being removed to the
outside of the crushing chamber, where they are not subjected to wear by contact
with the ore.
In the position described the drivers can be as perfectly lubricated as
the main shaft.
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 crushing mill, the combination of a closed crushing chamber containing
a crushing ring and crushing roller, said roller being driven by arms set outside of
said chamber and communicating with said roller by means of shafts passing through
the casing of said chamber, substantially as described.
2: In a crushing mill the combination of slotted arms carrying a shaft on which

page_text: a crushing roller is set, said arms being set outside of a closed crushing chamber and
said shaft being held in journal-boxes having a free motion in slots on said arms,
substantially as described.
3: In a crushing mill and combined with a crushing ring, crushing rollers
having a planetary motion carried by a shaft passing through the casing at both
ends and supported in journal-boxes set in revolving arms outside of the crushing
chamber, said journal-boxes having a free motion in said arms to and from the
axis of rotation of said arms, substantially as described.
4: In a crushing mill the combination of a shaft carrying a crushing roller
having a free motion to and from the axis of rotation, side-pieces of the crushing
chamber provided with slots through which said shaft passes and a disc attached to
said shaft in front of said slot to prevent leakage, substantially as described.
5 In a crushing mill the combination of a shaft carrying a crushing roller
having free motion to and from the axis of rotation, a sieve provided with slots
through which said shaft passes and a disc attached to said shaft in front of said slot
to prevent leakage, substantially as described.
6 In a crushing mill the combination of a shaft carrying a crushing roller, said
shaft being carried by a revolving arm in which it has a free motion to and from the
axis of rotation and adjustable means for limiting said motion, substantially as
described.
7: In a crushing mill the combination with a crushing roller of a supporting
shaft, slotted arms carrying said shaft and springs against which said shaft cushions,
substantially as described.
8-In a crushing mill guide flanges c in combination with the distributing fans b,
substantially as described.
9: In a crushing mill the combination of a plurality of sieves, the inner sieves
having larger meshes than the outer sieves, substantially as described.
10 In a crushing mill the combination with a casing of a revolving disc
provided with fans on its periphery, substantially as and for the purpose set forth.
11 In a crushing mill an outer fine sieve and an inner coarse sieve, said inner
sieve having smaller dimensions and being set a distance in front of the outer
sieve, substantially as described.
12: In a crushing mill, a crushing ring and a crushing chamber combined with
means for adjusting the position of said ring, substantially as described.
13 In a centrifugal crushing mill, the combination of a crushing ring, a
crushing roller, a shaft on which said roller is carried, arms set outside of said
chamber for imparting motion to said roller and springs against which said shaft
cushions said roller revolving about the axis of said crushing ring and being by
centrifugal action forced against the interior of said crushing ring and said springs
constantly tending to throw said roller away from said ring, substantially as
described.
14: In a crushing mill the combination of a revolving shaft carrying a crushing
roller, a crushing chamber, a revolving side plate provided with perforations through
which said shaft passes and a disc attached to said revolving shaft between said side
plate and said crushing roller, substantially as and for the purpose specified.
15 In a crushing mill, an enclosing chamber provided with an inner cir-
cumferential groove, combined with a revolving side plate N¹ forming part of said
enclosing chamber, a fan carried on said side plate and travelling in said groove,
substantially as described.
16: In a crushing mill, the combination of an enclosing chamber provided with
an inner circumferential groove, a crushing ring, a crushing roller, a shaft revolving
about the center of said ring and carrying said roller, a revolving side plate N
forming part of said enclosing chamber, a fan carried on said side plate and
travelling in said groove, substantially as described.
17-In a crushing mill, the combination of a crushing ring and crushing roller,
of a plurality of flat sieves revolving in parallel planes with an intervening space
between them, said space being open at its periphery, substantially as described.

page_text: 18 In a crushing mill, a crushing ring and roller and a plurality of revolving
sieves of different mesh, set one in front of the other, with an intervening space
between them, said space being open at its periphery, combined with a revolving fan
arranged substantially as described to travel about the periphery of said intervening
space.
19-In a crushing mill, a revolving shaft carrying a crushing roller, a side plate
through which said shaft passes, combined with a disc attached to said shaft a
distance inside of said side plate, to prevent by centrifugal action of said disc leakage
through said side plate, substantially as described.