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Патент USA US2115223

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April 26, 1938.
Filed May 16, 1934
4 Sheets-Sheet l
April 26, 1938.
Filed May 16, 1934
4 Sheets-Sheet 2
' "
. mm
Patented Apr. 26, 1938
‘ ORE rmnocmo mom
Harlowe Hardinge, York, Pa.
Application May 16, 1934, Serial No. ‘125,847
6 Claims.
(01. 83-46)
This invention- relates to ore reducing ma-
\ ,
combined a separate means for classifying the
More particularly the invention relates to ore
reducing machines of the type comprising a
5 rotatable‘ drum having a considerable diameter
and comparatively narrow width.
Another object of the invention is to provide
an improved ore reducing machine in which the
ore ?rst discharged from the elevating means 5
of the machine is intercepted by a grizzly or
The drum of an ore reducing machine of this
type has a plurality of material elevating means
or buckets arranged around the inside periphery
10 thereof for the purpose of‘ elevating the ore or
other material to a considerable height.
The drum is also so constructed as to con?ne
screening device which separates the coarser
particles from the ?nes and returns the coarser
particles to the machine for further reduction,
and in which means are provided for delivering 10
the ?nes to a device disposed outside of the ore
reducing machine and adapted to further clas
the ore'undergoing reduction to a relatively nar-
sify the ?ner particles of the ore.
row zone. In this way the grinding or disinte15 grating of the ore is done in a closed circuit.
Another object of the invention is to provide. _
an improved ore reducing machine in which the 15
Disposed within the, drum, preferably adja-
drum ‘of the machine is mounted in a ?exible
cent the bottom portion thereof, are stationary
cradle adapted to move with irregularities in
impact means.
the shape of the drum as it rotates.
The impact means may be in '
the form of a plurality of plates which are
2 O located in the path of the falling ore discharged
from the elevating means.
The impact means are usually so disposed
and constructed as to support a comparatively
Another object of the invention is to provide
an improved means for rotatably supporting 20
and driving the» drum of an ore reducing ma
chine in‘ which irregularities both in the motion
0f the drum and the driving means are taken
shallow bed of crushed or disintegrated ore. ~ care of
25 This shallow bed of ore on the impact means absorbs the shock of the oncoming ore and thereby
prevents excessive or- undue wear of the plates
which constitute the impact memm
' Another object of the inven?‘m is to PFO' 25
vide an improved- ore .reducmg machine in Whlch
means are pmvided for removing excess mate"
Furthermore, in ore'reducing machines of this
30 type, means are usually provided for classifyf
rial from the machine in excess of a predeter
mined amount’ so as‘ to reduce the power con‘
sumption and frictional wear~ on the inside of 30
ing the ore so that the ?nes are continuously
the drum of the machine‘
removed from ‘the machine as new or fresh
material is delivered thereto. Fluid classifying
means, either in the form of air or water, have
been used for classifying purposes.
In the case where water is used for classify
Another object of the invention is to provide
an Improved ore reducing machine m ‘wmch
means are provided'for removing the ground and
partly ground material at an elevation su?iciently 35
‘high above the bottom of the machine so that
ing the pulverized ore, the ?nes are ?oated ‘211:: gvviggiiggzgtunr?'etgral tgaenmg? glassmeg and
off through a suitable discharge launder.
According to the methods heretofore employed
y grav y'
Another object of the invention is to provlde
an improved classifying system for ore reducing 40
for removing the ?nes, the ore remained in the
machines of the above type in which, means are
gnndmg clrcult ,unm reduced to ?nes which
would float off with the water or other classifymg niedmm‘ Thls has retarfied the productive
provided within the machine for partially clas
sifymg the material and additional classifying
means are provided'outside of the machine for
45 cap?-c1ty_°f the machines’ smce many ‘of the
the ?nal classi?cation of the'material so as ‘to 45“
?nes which otherwise would have been removed
improve the character of the product produced .
from the grinding Circuit, remained in the gl'ind-" and increase the efficiency of the machine.
ing circuit along with the ‘coarser particles of
Another object of the invention is to provide
Ore undergoing reduction
an improved ‘ore reducing machine in‘ which‘ '
By the present invention a new method of means are provided for maintaining the load 50.
classifying the ore has been'devised so as to. within the machine within the con?nes of the
hasten the removal of the?nes and therebyin-
crease the productive ‘capacity of the machine.
elevating means.
' '-
Another object of the invention is to provide"
An object of the invention is to provide an" " an improved ore reducing machine of‘the char-'
55 improved ore'reducing machine with which is
acter mentioned, which is simple in construc-' 55,
tion, and reliable and exact in function under
all conditions of service.
The invention also comprises certain new and
useful improvements in the construction, ar
rangement and combination of the several parts
of which it is composed, as will be hereinafter
more fully described and claimed.
In the accompanying drawings:
Figure l is an end elevation partly in section
10 of an ore reducing-machine embodying the in
, Figure 2 is an elevator of the machine shown
in Fig. 1, looking at the driving mechanism;
Figlure 3 is a plan of the structure shown in
15 Fig.
Figure 4 is an enlarged plan of the take-off
Figure 5 is a section taken on the line 5-5
of Fig. 4;'
By constructing the buckets It in the above
described manner, when the drum H is rotated
in the direction indicated by the arrow in Fig. 1,
material or ore disposed in a lower bucket will be
made to rise with the lower bucket to a consid 10
erable distance above the axis of the drum, and
while thus rising will be crowded by the slanting
sides 2|, 22, toward the back of the bucket, oc
cupying a central portion of the drum until it is
?nally discharged over the inner edge of the
bucket as the latter assumes a horizontal position,
and on further ascent changes to a downwardly
inclined position. Due to the shape of the side
walls of the bucket, the material, when the bucket
reaches the discharging position, will occupy a 20
central position and will drop through the center
of the drum, that is that space between the end
supporting cradle;
?anges l3, [4.
of Fig. 7;
. '
9-901’ Fig. 1, and
Figure 10 is a section taken on the line ||l—|0
of Fig. 9 and showing the manner of supporting
30 the drum supporting cradle.
While I have shown only the preferred form of
the invention; it should be understood that var
ious changes or modi?cations may be made with
in the scope of the claims hereto attached with
out departing from the spirit of the invention.
Referring to the drawings, the improved ore
reducing machine may comprise a drum || hav
ing an annular peripheral wall l2 and opposite
- end ?anges l3 and M which depend from the wall
,40 l2. As shown by Figs. 1 and 2, the thickness of,
the drum‘ is'comparatively narrow with respect
to the diameter thereof.
In this’way the material or ore '
discharged from a bucket will not spread out
wardly su?lciently to fall through, the openings in 25
_ Figure 9 is a vertical section taken on the line
Fig. 6.
Figure 6 is a detail section of one of the
‘buckets, taken on the line 6-6 of Fig. 1;
Figure 7 is a detail of a portion of the drum
Figure 8 is a section taken on the line 8-8
The side portions of the mouth of each bucket
iii are contracted by means of oppositely disposed
V-shaped plates 2|, 22, which are secured to the
end ?anges l3, M, respectively, as shown in
the end ?anges l3, I4 of the drum ll.
Material or ore is delivered to the drum H
from a feedv hopper 25, located adjacent one end
of the drum, as clearly shown in Fig. 3.
As shown, the drum H is rotatably supported in 30
a cradle 21, comprising a pair of arcuate ?exible
members 28, 29 disposed underneath the drum
and located, respectively, adjacent the two ends
For the purpose of supporting the cradle 21, I 35
utilize a frame work 30 constructed preferably of
structural steel and including uprights, 3|, hori
zontal beams 32, and diagonal braces 33. The
various parts of the frame work'3li may be formed
from I-beams, channels, angle-irons and the like,
as shown.
The wall l2 and ?anges I3 and H of the drum
I l are preferably constructed from sheet mate
45 rial, such as plate steel of suitable gauge, the
adjoining edges thereof being fastened together
to form a water tight structure by any suitable
method, such as welding.
The end ?anges l3 and I4 of the drum II are
50 in the nature of annular rings and are open at ,
the center, as shown in Fig. 1. In this way a
certain amount of water may be accommodated
in the bottom portion of the, drum for a purpose
to be hereinafter more fully described. The water
55 is fed into the drum || through a suitable pipe l5.
The frame work 30 is mounted on suitable sup
porting means, such as concrete posts or pillars
34 (see Figs. 1 and 2).
The ?exible members 28, 29 comprise a chain 45
like structure composed of a series of bars or
links 35 of suitable length. The adjoining ends
of the bars or links are pivotally connected to
gether by shafts 36.
Each shaft 36 also serves to support a pair of 50
?anged wheels 31, which are disposed between the
'bars in the manner shown in Fig. 8.
The wheels 31 engage annular tires or tracks
38 mounted on the exterior of the wall l2 of the
Arranged around the interior of the peripheral _ drum II, and disposed adjacent the end ?anges
wall I! of the drum H and con?ned between the
. end ?anges l3 and I4, is an annular series of
As shown in Figs. 1 and 6, each bucket l6 consists of a rectangular piece of sheet material, such
as plate steel, the side edges |1, |8 of which are
As shown, the wheels 31 have a single ?ange,
the ?anges of each pair of wheels being so dis- ,
posed as to' engage the inner edges of the tires
or tracks 38 as shown in Fig. 8.
The ends of the ?exible members 28, 29 are‘
anchored to rigid cross members 39 carried by
fastened to the end ?anges | 3, l4, respectively,
and the rear edge I9 thereof being fastened tovthe the frame work 30, by means of blocks 40 and
65 peripheral wall |2 of the drum, by any suitable , bolts 4|. Interposed between the blocks 40 and 65
method, such as welding, as indicated at 20,l_ the cross members 39 are‘ resilient pads 44 formed
Fig. 6.
of rubber or ‘the like, which are adapted to ‘absorb
The sheet of plate steel forming the bottom of vibration and shocks transmitted by the drum II
each bucket l6 projects inwardly from the wall l2 to the cradle 21.
In order to prevent undue lateral swinging 70
z 70 of the drum II and is inclined in the direction of
travel, as shown in Fig. 1. In this way the movement of the' drum II and its cradle mount
buckets constitute pockets for containing a suit
ing, the intermediate bars or links 35 of the
able quantity of ore or other material, said ?exible members 28, 29 are formed with grooved
pockets being wider at their bases than at their or slotted portions 42, which are slidably mount
as clearly shown in'Fig. l.
ed in uprights 43 projecting upwardly from the 75
foundation of the machine, as shown in Figs.
and lower ends, and opposite side walls 61. The
1 and 9.
side walls 61 are disposed adjacent the bailie
plates Bil, and at the lower end of the grizzly, the
' "
For the purpose of rotating the drum ll, suit
able driving mechanism is employed, said driving
mechanism including an electric motor or other
prime mover 45 and a ?exible chain or other
similar driving element 46, which is operatively
connected to the drum II and in turn is adapted
to be actuated by the motor 45.
The links of the chain 46 engage the teeth of a
gear 41 arranged around the outer periphery of
the. drum II, as shown in Fig. 2.
The chain 46 is in the form of an endless loop.
one end of which passes around an idler 48 ro-'
15 tatably supported ‘on a shaft 49 carried by the
side walls 61 are formed with depending cars
69, which are pivotaliy connected to a frame,
as indicated at 10, Fig. 5,
The outer or higher portion of the bottom 86,
of the grizzly is imperforate, while the inner or
lower portion of the bottom is perforated, as
indicated at 68, Figs. 4 and 5. The perforated
portion 68 of the grizzly constitutes a screen
through which the fine material deposited on the
grizzly can pass and thereby be separated from
the coarser particles.
Underlying the grizzly 65 and ‘preferably sup 15
5!, also journalledin the frame work”. As
shown in Fig. 1, the chain‘ 46 underlies and en
ported from the battle plates 60, is a trough ‘H,
the upper portion of which has an 'area corre
sponding substantially'to/“the area of the per
forated portion 68 'of the grizzly .so that the ?ne
20 gages a sector of the drum ii at one side of the
material‘ which passesv through the perforations
frame work 30, and the other end of which passes
around a gear or sprocket 50 mounted on a shaft
68, will be collected.
v20 '
The shaft 5| also has a large gear 52 mounted
Leading from one end of the trough ‘H, is a
thereon, said gear being in meshing relationship
,launder or {pipe 12, the purpose of which will be
with a pinion or small gear 53 carried by a shaft I hereinafter more fully described.
The grizzly 65 normally rests on and is sup 25
Shaft 54 also carries a large gear 55, which. is ported by the upper edge of the trough ‘H, as
operatively connected with the gear 56 of the shown in Figs. 1 and 5.
The purpose of pivotally mounting the grizzly
motor 45, by a ?exible element, such as a chain,
65 is to permit upward swinging movement there
V-belt, or the like 51.
In this way operation of the motor 45 will be of in case any large pieces of material or other 30
transmitted through the power transmitting
mechanism above described to the drum chain 46,
at greatly reduced speed and the drum II will
accordingly be rotated at a comparatively slow
As shown in Figs. 1 and .9, the frame work
30 also serves as means for supporting two sub
stantially semi-circular baf?e plates 60. ; These
ba?ie plates are respectively disposed adjacent
40 each end of the drum ll, so that all the material
dropping from the buckets I6, is confined to a cen
tral zone between the two bai’lle plates.
Extending through the drum Ii and supported
from the baf?e plates 60, are av plurality of im
45 pact means or breaker plates 6|, which are lo
cated in the path of the material falling from
v the buckets I6:
objects project beyond the discharge lip of an
ascending bucket an amount su?icient to strike
the outer portion of the grizzly. In such case,
when the underside of the grizzly is engaged by
material projecting from a bucket, the grizzly 35
will move upwardly about its pivots .10 and thus
permit the upward passage of the obstruction
without causing any damage to the bucket or the
grizzly. As soon as the obstruction is removed
and the bucket moves past the end of the grizzly,
the grizzly will drop back to its former position
on the trough ‘H. In this way clogging of the
machine at this point will ‘be prevented.
Material falling out of. the buckets onto the
grizzly will be separated, the coarser particles .45
rolling down over the grizzly and dropping off
the lower inner edge thereof, and the ‘?ner par
Two of the breaker plates 6| are supported on
ticles passing through-the perforations 68 into
I-beams‘ 62, while the remaining breaker plates
the trough ‘II. The undersize or ?ner particles
50 are mounted on saddles 63 supported from‘ the
baf?e platesisee Figs. 1 and 9).
which pass through the screen provided by the
perforated‘portion 68 of the grizzly‘, ?ow down
It will bev noted that the breaker platesl?i,
the launder ‘I2 and out of the machine.
If the screen openings of the grizzly 65 are of
su?icient size, complete classi?cation of the ma
terial'may be accomplished at this point. How
eyer, since in most cases a ?ne product is desired
and since such a ?ne. product can only be ob
tained by\employing a grizzly having a ?ne
screen, it has been found by actual practice that
I-beams 62, and saddles 63 are arranged at a
slight angle to the horizontal plane, the angle
55 being such that the dropping material which fol
lows a curved path strikes the breaker plates 6|
substantially at right angles.
It should also be noted that the breaker plates
6| are arranged in upper and lower series, the
60 breaker plates of the lower series being arranged
practicable due to- the unsatisfactory wearing
At a suitable position above the breaker plate
6| at the extreme right hand side of the ma
chine as viewed in Fig. 1, and also disposed ad
fore, it. has been’ discovered that better results
can be obtained 'by employing a grizzly having a
65 jacent'to the ascending buckets I6, is a take-off
grizzly 65.
The grizzly 65 may comprise a substantially
qualities of a ?ne screen at this point.
comparatively coarse screen for the purpose of 65
separating the coarser particles from the ?nes
and then further classifying the ‘?nes in order
to separate the coarser particles therefrom and
angle so that the outer or top edge which is
return the same to the machine for further re
toward the center of the drum.
rectangular plate which is sloped or set at an -
70 close to the rising buckets, receives the material
?rst discharged from the buckets. As shown in
Fig. 1, the grizzly i5 slopes downwardly from a
point adjacent the discharge edge of the buckets
the use of a grizzly having a ?ne screen is im
in staggered relation to those of the upper series.
7.04 ,
According to the present invention the ?ne ma
terial which passes through the screen 68 of the
grizzly 65 is delivered by the launder 12 to a
classi?er device 15 located along one end of the
The grizzly 65 has a ?at bottom 66, open upperi drum ll. Any suitable type of classi?er 15 may 75
be employed. ‘In the present instance I have
ter of fact I ?nd that a diameter of twenty feet
or more is economically best suited for my pur
poses. If a drum of such diameter were made of
shown a classi?er along the general lines of the
rotary wet classi?er shown in my Patent #l,91'7,-~
300 granted July 11, 1933.
the length of the drums usually employed in
The classi?er 15 comprises an elongated drum
16 which is rotatably mounted on the frame work
30 heretofore referred to, said drum being set in
washing or grinding operations, it would be en
tirely unwieldy, and this is one of the reasons
why I reduce the length of the drum to such an
extent that the diameter of the drum is greatly
in excess of the length, and the entire drum ap
an inclined position with its longitudinal axis at
angle to the horizontal plane, as shown in Fig. 1.
'10 The upper or higher end of the drum 16 is formed pears as being narrow, as compared with its di
with a conical lip ‘11 over which the oversize ma
terial passes and is discharged into a trough or
This construction is also advantageous in view
launder 18 leading to the interior of the drum of the fact that the drum works on principles al
I I_, so that the oversize is returned to the machine together di?erent from those controlling drums
15 for further reduction.
used in washing and grinding operations; in the
At the lower or opposite end of the drum. 16
there is an annular lip 19 over which the ?nes
overflow and are delivered to a trough or launder
80 leading from the machine.
The launder 12 heretofore referred to projects
latter the material is slowly advanced from one
end to the other so as to be discharged from the
end opposite to that which it entered. In my
drum there is no such forward travel of the ma
terial, and as a matter of fact the material is
continuously raised and dropped in the same
plane until it is reduced to a size which allows it _'
into the upper end of the drum 16 a suitable dis
tance, as shown in Fig. 1. The progress of ma—
terial through the classi?er 15 is such that the
to be carried off as ?nes.
coarse or oversize material is carried toward the
After the material has made impact with the
25 discharge end at the right of the drum ‘[6, as
breaker plates it drops into the buckets disposed
viewed in Fig. 1, and the ?ne material is ‘carried’ . in the bottom of the drum.
out‘ from the opposite end of the classi?er by
. water over?owing therefrom.
'_ As shown by the dotted lines in Fig. 1 the in
30 terior of the drum ‘I6 is formed with screw ?ights.
8|, which urge the coarse material toward the‘
upper or right hand end of the classi?er.
For the purpose of rotating the classi?er 15,
roller treads 82, 83,-Fig. 1, are provided which
35 rest upon pairs of rollers 84; 85, near the ends of
the classi?er. These rollers are mounted on
shafts 86, 81, which are operated by a motor 88
and intermediate drive 89.
Since the description and operation of the clas
40 si?er are fully described in the above mentioned
patent, no further explanation of the device is
deemed necessary herein. It should be noted,
however, that the classi?er herein shown and re
“ferred to is of a type particularly suited for the
45 purpose of grading the product of the ore re
ducing machine so that the ?nal product will be
uniform and have the desired degree of ?neness.
It should also be noted that the location of the
classi?er 15 with respect to the grizzly 65 permits
gravity ?ow of the material from the ‘machine to
the classi?er and gravity ?ow of the oversize material from the classi?er back into the drum II,
and also gravity flow of the ?nes away from the
classi?er. In this way the cost of operating the
65 whole apparatus is reduced to a minimum.
In the operation of the device, material is fed
into the drum I I from the hopper 25, the material‘
falling into the buckets in'the bottom of the
drum. The buckets raise the material and grad
60 ually discharge the same for violent impact
against the breaker plates 6| whereby the ma
terial is comminuted and made to gravitate from
the breaker plates back to the buckets in the bot
tom of the drum H.
In this connection it should be observed that
the dimensions of the drum of the machine are of
great importance. It will be noted that as com
pared with drums used in ordinary cleaning or
washing operations, the drums are of compara
70 tively small diameter as compared with the length
of the drum. In the present instance it is. pro
posed to produce a distinct chipping action by the
dropping of the ore on the breaker plates, and the
drum H therefore is made of a diameter far in
; excess of that commonly employed, and as a mat
During operation of the machine the buckets
l6 carry the entire load of the material within
the drum with the exception of the small amount
of material lying on the breaker plates 6| and the
material falling from the upper buckets.
With this in mind, as the buckets rise up from}
the bottom of the machine, each bucket will be
?lled with ore, with which is mixed a quantity of
Due to the shape and construction of the buck
ets the material carried therein during normal
operation of the machine will not ‘commence to
spill vfrom the buckets until after the buckets
rise to a point above the axial center of‘ the 40
drum ll.’
As shown in Fig. 1, the grizzly 65 is located at a . *
point above the center of the drum and below the
point at which the material begins to spill from
the buckets.
If the water and ore does spill below the grizzly,
the machine ‘becomes unstable in operation and
is likely to become overloaded with a mixture of _
oreand water spilling back down the buckets.
This condition increases wear and power with lit 50
tle or no increase in capacity of the machine, and
is an undesirable method of operation. The lo
cation point of the grizzly 65 is therefore impor
tant, and when the grizzly is positioned as above
described it improves and stabilizes the operation 55
of the machine to a marked degree as will be
The coarse ore will drop on the grizzly, but
will not pass out of the circuit unless the par
ticles are small enough to pass through the perfo 60
rations 68, but will slide over the grizzly and fall '
directly down into the bottom portion of the.
drum, striking on the way down ,the impact or
breaker plates at the right hand side of the
machine as viewed in Fig. 1.’ However, the great
est portion of the coarse particles of material,
together with a certain quantity of ?nes that
are embedded in the coarse pieces in the buckets,
will be carried on past the grizzly 65 and drop
on the breaker plates 6|, where the crushing ac 70
tion takes place in the manner previously de- '
The ?ner particles of the material together
with the water which fall on the grizzly 65, will
pass through the perforated portion 68 and into 75.
the trough ‘H and from thence will ?ow down
the launder 12 to the classi?er 15.
The ?ner particles together with the water
which are delivered to the classi?er 15 by the
launder 12, are subjected to the classifying ac
tion whereby the coarser particles are returned
to the drum ll through the launder 18 and the
?nes carried away by the launder 80, as has been
heretofore described.
From the foregoing it will be noted that by my
invention I have ‘provided an improved ore re
ducing machine in which means are provided
within the drum of the machine for partially
classifying the ground material and additional
classifying means are provided outside of the
drum-ll for the ?nal classi?cation of the mate
rial. In actual operation of a machine construct
' ed according to my present invention the char
acter of the product has been improved con
20 siderably over the products of other ore reducing
machines heretofore in use, and due to the con
struction and arrangement of the parts and the,
manner of operating the classi?ers, the amount
of power consumption and the frictional wear
25 on the interior of the drum of the machine has
been reduced to a minimum, so that the machine
can be successfully used for reducing lower
grades of oreon a paying basis than would other
wise be possible.
Having thus described my‘invention' what I
claim and desire to secure by Letters Patent is:—
1. An ore reducing machine comprising a ro
I tatable drum, impact means within the drum for
receiving the thrust of the material, elevating
35 means for lifting the material, and for discharg~
ing the same toward said impact means, a grizzly
disposed above the impact means and located in
the path of the material ?rst discharged from
the elevating means for classifying the material
40 ?rst
the ~ elevating
means for supporting said grizzly, including piv
ots at one end of the grizzly and a rigidly mount
ed discharge trough for receiving the ?ner par
ticles from the grizzly, and a launder leading
45 from the discharge trough, the pivots permitting
upward swinging movement of the grizzly in case
the grizzly is struck by obstacles projecting out
wardly from said material elevating means. 4
2. An ore reducing machine comprising a.
50 frame work, an arcuate cradle resiliently sup
ported at each end by said frame work, a drum
I rotatably mounted in said cradle, means for io
tating said drum comprising a ?exible element
operatively connected to the loaded side only of
55 said drum, a source of power,.speed reducing
means operatively‘ connecting said source of
power and said, ?exible element; impact means
within the drum ‘for receiving the impact of the
material undergoing reduction in the machine,‘
60 elevating means on the‘ drum for lifting the ma
terlal and for discharging the material toward
3. An ore reducing machine comprising a ro
tatable drum, impact means within the drum for
receiving the thrust of the material, elevating
means for lifting and discharging the material
toward said impact means in a series of laterally
descending streams, a stationary grizzly disposed
above the impact means and located in the path of -
the portion of the descending stream of material
?rst discharged from the elevating means, means
formed on the grizzly for separating the ?nes
from the coarser particles, and means for further
classifying the ?nes separated by the grizzly and
for returning the oversize portion thereof to the
drum for further reduction.
4. In an ore reducing machine, the combina— 15
tion with a rotatable drum, of impact means
mounted within the drum for receiving the im
pact of the material undergoing reduction in the
drum, buckets carried by the drum for lifting ‘the
material and for discharging the material to 20
wards said impact means in a series of laterally
descending streams after the material has been
elevated a predetermined height, a screen for in
tercepting the material in the portion of the de- .
scending stream ?rst discharged from the buckets 25
and for classifying the material intercepted
whereby the ?nes are separated from the coarser
particles, means for removing the ?nes from the
machine, and means for discharging the coarser
particles from the screen toward said impact 30
means for further reduction.
5. In combination, a. breaker medium, a drum
having buckets for” elevating material and for
dropping the same on the breaker medium in a
series of laterally descending streams, stationary 35
screening means located in the path of the por
tion of the descending stream of material ?rst
discharged from the buckets for intercepting such -
material and for screening the same to separate
the ?ner particles from the coarse, means lo 40
cated without the drum and operatively associ
ated with said screening means for receiving the
?nes passing through the screening means and
for classifying the same whereby the coarser par
ticles are separated from the ?nes, and a launder 45
leading from said classifying means to the in
terior of the drum for returning the, coarser par-Y
ticles of‘ the classi?ed material to the drum for
further reduction.
6. An ore reducing machine comprising a 50
crushing chamber adapted to receive ore therein,
vmeans within the chamber for raising and drop
ping the orein a series of laterally descending
streams, an impact medium in the lower portion
of the chamber for receiving the dropping ore, 65
stationary screening means located in the path
of the portion of .the descending stream of ore ‘
?rst discharged from the ore raising means for
intercepting such material and for screening the
same to separate the ?ner particles from the
coarse, means for returning the coarserparticles
said impact means after the material. has been‘ to the crushing chamber, means located without
elevated a predetermined height; means ‘for in ' the crushing chamber and operatively associated
tercepting the material ?rst discharged from . with said screening means ‘for receiving the
65 said elevating means and for classifying the ma
passingthrough the screening means and for 65
terial whereby the ?nes are separated from the classifying the same whereby the coarser parcoarser particles, means for removing the ?nes -ticles are separated fromv the ‘?nes, and means
from- the machine, 'means for returning the
coarse particles to the machine for further re
duction, means for classifying the ?nes removed
connecting said last named classifying‘ means -, ,
with the interior-of the drum for returning .to
the drumthe-coarser particles of the classi?ed'ore 70
from the machine so as to separate the same into ' ‘for further" reduction. ~
?ne and'coarseparticles, and means for return
ing the coarsevparticles from the second classi?er
_ to the drum for further reduction.
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