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Патент USA US2119768

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June 7, 1938.
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D. s. ANTHONY
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2,119,768
GRINDING PLATE
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Filed Jan. 13, 1956
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2,119,768
Patented June 7, 1938
UNITED sTATEs PATENT OFFICE
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2,119,768
GRINDTNG PLATE
David S. Anthony, San Antonio, Tex.
Application January 13, 1936, Serial No. 58,815
3 Claims.
This invention relates to new and useful im
provements in grinding plates.
One object of the invention is to provide im
proved complementary grinding platesparticular
5 ly adapted for use in grinding material which is
fed to the plates from the center thereof and
is ejected from the periphery of said plates, the
plates being constructed so as to more emciently
perform the grinding operation.
An important object of the invention is to pro
vide an annular grinding plate having portions
along its inner edge bent out of alignment with
the plane of the plate, whereby, when two plates
are placed cooperatively together, the bent por
tions will provide enlarged inlets for the mate
rial to be crushed between the plates, whereby
a uniform feed and decortication, granulation or
pulverization of the material is had.
Another object of the invention is to provide
an improved grinding disk having concentric
rows of sharpened protuberances such as burrs,
serrations or teeth on its working face extending
from its inner edge to near its outer marginal
portion, said burrs, serrations or teeth being all
of the same depth and pitch; and additional rows
of smaller burrs, serrations or teeth on said outer
marginal portion all being of the same pitch, the
protuberances on said outer marginal portion be
ing approximately only one-half the size of the
30 other protuberances, whereby the ñner or smaller
ones serve to finish the grinding operation, which
increases the working capacity of the mill and
improves the quality of the product.
A further object of the invention is to pro
vide an improved grinding plate which includes
a base member anda supplemental disk arranged
to be secured thereto, the disk having the grind
ing teeth made thereon, whereby, when the teeth
become dull and replacement is necessary, said
so disk may be removed from the base member and
a new disk substituted therefor, instead of re
placing the entire grinding element; also, this
structure permits making the supplemental
grinding disk of thin steel, whereby the teeth
45 formedI thereon may be made suñ‘iciently sharp
for fine grinding, thereby attaining all the ad
vantages of a steel disk without the increased
cost incidental to constructing a thick integral
steel plate.
Gi 0
A construction designed to carry out the in
vention will be hereinafter described, together
with other features of the invention.
The invention will be more readily understood
from a reading of the following specification and
Ul Ui
by reference to the accompanying drawing, in
(Cl. 83-3)
which an example of the invention is shown,
and wherein:
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Figure 1 Ais a face view of a supplemental
grinding disk or plate constructed in accord-ance
withthe
invention,
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Figure 2 is a transverse, sectional View of the
same, taken on the line 2_2 of FigureI 1,
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Figure 3 is a cross-sectional view taken on the
line 3_3 of Figure 1, on an enlarged scale,
Figure 4 is a sectional view, showing two coop
eratively opposed complementary grinding plates
in working registration,
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Figure 5 is a face view of the base member
or supporting body plate, and
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.
` Figure 6 is a transverse, sectional view, taken 15
on the line 6_6 of Figure 5.
,
In the drawing, the numeral I0 designates a
circular flatdisk which is preferably made of
steel, but which may be constructed of .any suit
able material.
The disk is formed with an axial
opening II which _extends therethrough. The
disk as shown is comparatively thin but may be of
any
desired
thickness.
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A
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I
C A multiplicity of enlarged grinding burrs, or
teeth I2, formed on theworking face of the rdisk
are arranged in concentric rows which extend '
from the inner edge thereof at the axial open
ing II to an annular line I3 near the marginal
portion of the disk. Y The teeth are preferably V
shaped in cross-section or pyramidal in form and 30
the pitch of all of the teeth of said group is con
stantv whereby the majority of said teeth are all
of the same size.
Any suitable method may be employed in
forming the teeth. However, it has been found
35
desirable to form said teeth by first cutting con
centric V-shaped grooves Il’ of the proper depthl
in the face of the disk. After these grooves have
been cut, the disk is placed in a planer or milling
machine, and V-shaped channels or cuts I2’ 40
which cross the concentric grooves are milled.
The cross cuts do not extend radially from the
center of the disk but are formed in groups B,
the cuts of each group being parallel.- The first
cut C of each >group extends tangentially from 415
an imaginary circle A, shown in dotted lines,
which has a diameter smaller than the diameter
of the axial opening II. Thus, it is obvious that
the concentric grooves and cross-cuts form py
ramidal burrs or teeth I2 on the face of the disk.
Extending from the annular line I3 on the pe
riphery of the disk to- the edge thereof, an an
nular outer group of grinding burrs or teeth I4
are provided. The teeth I4 are also arranged
in concentric rows, are V-shaped Vin vcross-sec 55
2
2,119,768
tion, and are formed in the same way as the
teeth I2._ However, the teeth of this annular
outer group, as is clearly shown in Figures 1
and 4, are smaller than those of the groups of
teeth I2, preferably being substantially one-half
the size thereof. It is noted that the pitch of
the teeth I4 is constant, whereby all of said teeth
I4 are of the same size.
From the above, it will be seen that a circular
10 grinding disk having two distinct sets of grind
ing teethis provided; amultiplicity of enlarged
teeth I2 which covers the major portion of the
face of the disk, and a group of comparatively.
ñne or smaller _teeth which are located. annu
the registered axial openings II and I 6’ in the
usual way and as one cooperatively opposed plate
rotates with relation to the other, the material
enters between the curved or flared wing portions
and is fed from between the wings to between
the inter-projected teeth I2 and I4 on the non
slotted annular outer portions of the comple
mentary disks. Due to the curvature or flare of
the Wings, it will be seen that an enlarged inlet
space is provided, which eliminates all danger 10
of crowding the feed, whereby a smooth and even
feed is had.
After the material is introduced between the
plates, the group of enlarged teeth I2, which are
all of the same size, serve to crush and grind the
After the teeth or burrs I2 and îl4^have been"> material. If grain is being ground, the same is
larly at the marginal portion of the disk.
formed on the disk face, said disk is again placed>
in a milling machine and aplurality of slots I5
are cut therein. The slots extend tangentially
20 from Athe imaginary circle A, and cut entirely
through the disk. As is clearly shown in Figure
1, said slots extend from the inner edge of the
disk at the axial opening II to a point beyond
the middle of the groups B` of enlarged burrs or
25 teeth I2. It is obvious that the cutting of the
slots divides the inner portion of the disk into
a plurality of sections D. These sections are then
bent so Vthat their inner edges are out of align
ment with the plane of the disk. It is noted that
30 as shown the sections are bent at one corner
away from the face of the disk‘so that if the
disk were lying horizontal with its teeth upper
most, the sections D are bent downwardly.
When so bent, the inner portion of the disk is
35 provided with a plurality of corner curved wings.
After the plate is so formed, it is, of course, prop
erly tempered and hardened. K
In completing the grinding plate, a circular
40
as-the grain is passing therebetween, the grind
ing action is smooth and even, as there is no 20
choking effect due to a reduction in the size of
the
teeth.
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By the time the material reaches the marginal
portion of the disk, where the annular group of
smaller teeth I4 is located, it is well ground, and 25
since all the heavy work has been done, this group
of smaller teeth merely finishes the work to fur
ther grind and reduce or pulverize the material.
Since the groups of teeth I4 are all of the same
size, there is no retarding or choking of the ma 30
terial passing therebetween just prior to ejec
tion due to a gradual increase in the number
of the grinding teeth from the central inlet to
wards the peripheral outlet.
Thus, it is seenr that each disk has the two 35
groups of teeth, the major inner one with larger
teeth all of the same size, and the outer one with
smaller teeth> all ofthe same size. The inner
base or supporting body Vmember I6 having an
portion of each disk, as hereinbefore described,
axial opening I6’ is provided. This member has
an upstanding peripheral flange VI'I andan an
nular internal shoulder I8 just below said ñange.
may-be flared or curved, so as to provide an in
The shoulder is comparatively narrow in width
and between the inner periphery of the shoulder
45 and the inner edge of the base member, said mem
ber is formed .with sector-like recesses I9 the
bottoms of which are curved so as to correspond
to the curved wings of the disk I0.
The disk I0 is placed within the supporting
50 member I6 so that the underside of its annular
outer marginal portion rests on the internal
shoulder I8 with the peripheral flange I‘I encir
cling the edge of said disk I0. The curved wings
of the disk I0 engage in the curved recesses I9
55 of the supporting body member I6, and the axial
opening I I in said disk I0 registers with the open
ing I6’ in the member I6. The disk I0 is pro
vided with a plurality of bolt holes20 which reg
ister with threaded openings 2| V'in the member
60 I6, when said disk is located on said member I6.
portions flared, the wing portions of the comple
mentary disk being stra-ight, as shown in Figure 4
of the drawing. It is noted that these initial 45
material-receivingwings have some of the teeth
I2 thereon and these teeth aid in feeding the ma
terial to the major working space between the
disks.
It is pointed out that since the disk I0 is made 50
of thin steel, the advantages appurtenant to steel
cutting teeth are had, while the expense of mak
ing the entire thickness of the plate of steel is
overcome.
Also, the teeth are formed on the
disk and then said disk is tempered. It is well 55
known that during the tempering operation, the
thin disk may warp slightly but by bolting the
disk to the base member I6, the disk is straight
ened out when the bolts are tightened, after the
formingV of the teeth and tempering, and at the 60
same time said disk is rigidly fastened in proper
the heads of machine screws (not shown) which
pass through the disk and are screwed into the
openings 2I of the member I6 to securely fasten
the disk and member together to form the com
position on the body member I6.
In actual use, two cooperatively opposed plates
are provided and are positioned face to face so
_ that the concentric rows of teeth on one plate
70 enterbetween the rows of teeth on the other
plate. When so positioned, the opposed curved
wing portions of each disk flare away from each
other, whereby the teeth of said curved wing
, portions do not enter between~ each other.
The material to be ground is supplied through
40
creased inlet, but, in some cases, only one of the
cooperatively opposed disks may have its wing
The bolt holes are countersunk so asto receive
plete grinding plate.
75
hulled by these larger teeth. Since the teeth
are all- of the same size it is obvious that so long
It is noted that when the burrs or teeth of the
disks become dull it is only necessary to remove
the disks I0 from the supporting members I6 and 65
substitute new disks therefor. It being unneces
sary to replace the entire device, the operating
and maintenance cost is greatly minimized.
It is further pointed out that the disk I0 may
be made of a very thin gage metal and pressed> 70
into the shape shown in the drawing. In such
case, after the teeth are formed on the disk, the
disk may be stamped by a die to form the wings.
So, too, in such case, the slots I5 may not be nec
essary in the forming operation, and, therefore. 75
2,119,768
4there will be no separate wing portions, but the
inner marginal portion of the disk will be un
broken annularly and flared continuously around
the central opening I I. Also, instead of each sep
arate wing portion being curved or flared at only
one corner, as herein first described, it may be
flared throughout its entire width.
What I claim and desire to secure by Letters
Patent, is:
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vl. A grinding plate including, a disk having a
circular axial opening therethrough, pyramidal
grinding teeth arranged on the working face of
the disk in concentric rows, the disk being slotted
on lines tangential to a concentric circular line
15 within the axial opening and extending to a coen
centric circular line substantially at or near the
middle of the disk body, the portions of the disk
between the slots being offset from the plane of
the disk body to provide an annular series of
20 curved wings at the inner edge portion of the disk
surrounding the axial opening.
» 2. A grinding plate including, a disk having a
circular opening through the center thereof, sep
arate grinding teeth on one face of the disk ar
25 ranged in concentric rows and coviering the
entire surface of the disk, the disk being slotted
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on lines tangential to a concentric circular line
'within the central'opening of the disk and the
portions of the disk between the slots being oil'
set with curvature out of alinement with the
plane of the rest of the disk from the side op
posite to that on which said teeth are provided.
3. A grinding plate including, a disk having an
axial circular opening therethrough, a group of
concentric circular rows of teeth of a substan
tially constant size on the face of the disk and 10
extending from the inner edge of the disk to an
annular line near its outer margin, a second
group of concentric circular rows of teeth of a
substantially constant size extending from the
annular line where the íirst group terminates to 15
the peripheral edge of the disk, the teeth of the
second group being smaller than the teeth of the
ñrst group, and an annular series of wings at
the inner edge of the disk, said wings being sep
arated on lines tangential to a circular line within 20
the axial opening of the disk and each wing be
ing offset with curvature out of alinement with
the plane of the disk from the side of the disk
opposite to that on which said groups of teeth
are provided.
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DAVID S. ANTHONY.
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