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Патент USA US2405692

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Aug. 13,
‘
2,405,692
J_ R. HALL
GRINDING
MILL
’
Filed March 27, 19,44- .
11
572
7
£707.02 ?Ha-ZZ,
PMQ'PM
Patented Aug. 13, 1946
1 2,405,692:
UNITED ' STATES met-r OFFICE‘
' GRINDING MILL
John R. Hall, Chicago, 111., assignor to Interna
tional Harvester Company, a‘ corporation of
New Jersey
Application March 27, 1944, Serial No. 528,224
1 Claim. (01. 241---239)
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This invention relates to a new and improved
grinding mill and has for one of its principal ob
jects the provision of means for automatically
releasing the cylinder concave upon entrance of
some hard material which "would normally tend
2
ing {3 it Will be positively sheared by the cut
ting bladeZl.
t.)
to break parts‘ of the grinding mill unless the
operation of the mill was halted in some way.
An important object of this invention is to
provide a feed grinding mill capable of having
its concave released from its operative position
adjacent the cylinder either manually or auto
matically.‘
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The lower end of the semicylindrical concave
I4 is equipped with an outwardly extending
radial ?ange 24, the surface of which is inclined
as'shown at 25. The ?ange 24 is adapted to
abuttingly engage a member 26 which is rigidly
a?ixed to the hopper walls H. A release lever
21 is hinged at 28 on rearwardly extend-ing hinge
lugs 29 of the member 26. The forward portion
of the lever 27 has an inverted V-shaped surface
including inclined sides 30 and 3| and an apex 32. i
Another and still further important object is
The lever 21 has a relatively large opening 33
to provide a hinged concave yieldably held in
through which a long bolt 34 is adapted loosely
position adjacent a cylinder which is automati 15 to pass. The bolt 34 extends through the hopper
cally releasable and capable of repositioning by
wall H, through the member 26, and thereupon ‘
a mere manual swinging of the concave.
through the opening 23 in the lever 21. The
Other and further important objects willbe
bolt 34 is retained in its position by means of a
come apparent from the disclosures in the fol
head 35 at its upper end and a nut 36 at its lower
lowing speci?cation and accompanying drawing,
in which:
end. A spring 3'! is interposed between the nut
36 and the lever 21, thereby resiliently maintain
‘
Figure 1 is a longitudinal sectional view of the
ing the lever 21 in its uppermost position as
shown in Figures 2 and 3. The yieldable latch
is below the horizontal centerline of the cylinder
2—2 of Figure 1; and
25 and on the opposite side from the hinge Hi.
Figure 3 is a sectional view similar to Figure
In Figure 2 the concave I4 is yieldably locked
2 with the concave in released position.
in an operative position adjacent the cylinder
As shown in the drawing, the reference nu
l2. The inclined surface 30 of the lever 21 en
meral l0 indicates generally a housing for a
gages the inclined surface 25 of the concave ?ange
grinding mill and includes a feed inlet hopper I l 30 24. It is possible in feeding grain or other ma
which permits grain. or other material to be
terial to a grinding mill to accidentally put in
ground to reach a cylinder l2 which, as shown in
some foreign object such as a rock which would
Figure 1, has a spiral ?ighting I3 extending
be hidden by the grain and which would tend to
around the periphery and lengthwise of the cyl
cause great damage to the machine parts of a
inder. A concave i4 is positioned beneath and - ' feed grinder unless some safety means was pro
closely adjacent the cylinder I2 50 that material
vided. At the present time wooden shear pins
carried by the spiral ?ighting i3 is compressed
are employed to a great extent to prevent such
and partially ground against the concave Ill. In
accidents, but this method has proved incon
order to more thoroughly grind material, the
venient in reassembling the grinding mill in order
inner surface of the concave I4 is roughened as 40 to resume operation.
at I5 and shown in all the‘?gures of the draw
The action of the'present device is to auto
grinding mill of this invention;
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Figure 2 is a sectional view taken on the line
ing.
matically permit the inclined surfaces 24 and 30
to slide apart relative to each other and thus
The concave I4 is hinged above the horizontal
permit the concave to swing about its hinge I5
center-line of the cylinder 12 at Is to lugs H
which form an integral part of a casting l8 45 and take the position shown in Figure 3. The
releasing of the concave is instigated upon over
bolted or otherwise attached as shown in Fig
coming the force of the spring 31. Therefore,
ure 2. A cutting blade 2| is bolted to the up
when an obstruction enters the cylinder and con
wardly extending ?anges l8 at 22 and extends
cave, a downward force is applied to the concave
inwardly to a point very close to the periphery
M which acts directly on the spring 31 through
of the cylinder spiral ?ighting l3. The cylinder I
the lever 21. It is obvious that no parts will be
12 rotates in a counter-clockwise direction as
viewed in Figure 2 and indicated by an arrow
23. It will be apparent that as material to be
ground is fed longitudinally by the spiral ?ight
' broken, and that the obstruction, whatever it
may be, will drop down through an opening 38
between the concave ?ange 24 and the release
55
lever 21. In order to resume grinding operationa
2, 405,692
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the concave I4 is manually swung about the hinge
l6 so that its flange 24 will ride up on the in
clined surface 3! of the lever 21. Inasmuch as
the concave M has a ?xed arcuate movement, it
will be apparent that the release lever 21 must
and hence manually release the concave M. A
plate M hinged as at 45 or otherwise fastened is
adapted to cover the opening 43. Such manual
releasing may be necessary in cleaning out the
feed grinder Or for any other purpose which is
deemed advisable.
yield downwardly against the action of the spring
31. Immediately upon the ?ange 2,4 riding over
the apex 32 of the le’ver‘2‘l, the spring; 3;‘! forces:
the lever 2T upwardly so that the ?ange 24' rides‘
down the incline 30 and thereupon locks the con;
cave in the position shown in Figure 2.
The spiral ?ighting l3 of the cylinder [2. 126.1%.
forms two functions—?rst, that of preliminarily
breaking up material to be; ground andlseconsir
that of feeding the grain longitudinally of the‘
cylinder I2 to grinding plates 39 and 48. The
plate 31 is permanently ?xedtn the; housing 10»;
of the grinding mill, and the plate 49 rotates with
It will be apparent that herein‘ is provided a
novel; concave, for feed grinders havingga resilient
locking means which permits automatic releasing
T of the concave as well as automatic relocking of
the concave upon giving the concave a manual
swing,
The intention is‘, to limit the invention only
’ within the; scope of: the appended claim,
What iscl'aimedi‘s:
In a material treating machine comprising a
housing; arotatable cylinder within said housing,
a concave partially surrounding said cylinder,
said‘ concave being hinged at one side of said
truded between the plates 39 and 40 and then 20 cylinder and fastened by means of a yieldable
latch- at" the other; side of»v said- cylinder»; said
carriedlbyy thrower blades- 41» to someidepositorya
the cylinder [2.
Material to be ground‘ is ex‘
The means for driving the“ cylinder‘ l2 andiplat'e
yieldable latch» having’ means for" automatically
4ll¢ma~y~be one'oi several devices sucl'ra'sian' elec
releasing the concave upon theLattainmen-t of’ a
predeterminedpressure- between said cylinder and
tric-motor or» frorn- the- power 'GEKBfO?JOff a_ trac
tor; whichever is-a-vailable; A‘ lever 5’2‘v is provided 25 concave; and further‘ means for manually‘releas
on the‘outside of the-feed grinder and‘ permits
ing saidr ceneave,_ saidv'la'tch comprising a» hinged
adjustment of the plates $9 andi Mlewithv respect
to each other.
a
An- opening’ 43‘ is provided‘ in- one
the side
walls ~ I i) of - the-feed grinder to enableianroperater
toinsert- his arm and‘ pull d'ewneony the lever; 21'
leverJ-having-Ian»inclined porticn-slidably engaging
a- be'veledilug‘on the-concave, aspring- adapted-to
normally hold-said‘ lever in: engagement with- said!
beveled-lug.
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