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Патент USA US2125352

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Aug- 2, '193&
R. D. ME‘CDONALD
SCREEN-SEAL FOR HAMMER MILLS
Filed July 5, 1935
2,125,352
Patented Aug. 2, 1938
2,125,352
UNITED 'STATES PATENT OFFICE
2,125,352
SCREEN, SEAL FOR HAMMER- MILLS
Raymore D. MacDonald, ‘Western Springs, 111.,
assignor to International Harvester Company,
a corporation of New Jersey
Application July 5, 1935, Serial No. 29,780
4 Claims.
The invention relates to an improvement in
hammer mills.
‘
In hammer mills of the upright or vertical type,
there is provided a cylindrical drum or housing,
5 the inner periphery of which is lined with a
screen.
The drum includes a hinged cover por
tion, which may be swung upwardly to expose
the interior of the mill. A section of the screen
lining is carried by the cover. Consequently at
10 the hinge between the cover and drum casing
there is necessarily a break in the screen lining,
leaving a gap in the screen, through which ma
terial in process within the drum objectionably
leaks. To prevent such leakage it is desirable to
151 provide a seal to bridge this gap in the screen
when the cover is closed.
The main object of the invention, therefore, is
to provide a screen seal for the purpose men
tioned.
'
Another object of the invention is to provide
such a seal of simple inexpensive construction
that can be operatively associated with standard
hammer mills without altering the structure of
the mill.
25
,
Still another important object is to provide
such a seal which automatically assumes ‘its
screen gap bridging position when the cover for
the drum is closed.
Other important objects will become apparent
as the disclosure is more fully made.
The improvement may be applied in one prac
The mill shown embodies a base l0, carrying an
upright casing in the form of a substantially
cylindrical drum I I lined with a peripheral screen
l2. Near its top the drum carries a bracket I3
for mounting a hinge pin 14, to which in turn is
connected a bracket hinge [5 for carrying a
hinged cover Hi. This cover carries a section I‘!
of the screen. Thus a break or gap occurs be 10
tween adjacent ends of the screen sections I2, I‘!
adjacent the hinge [4.
The drum carries a shaft I 8 for driving and
mounting a rotor disk I9, the periphery of which
carries hammers 20 cooperating with the screen 15
in reducing material fed into the drum in any
conventional manner not illustrated. The drum
at its bottom is provided with a pocket 2! to re
ceive stones or other chunks of foreign material
accidentally fed into the drum. One portion of
the screen l2 at [2’ is open so that reduced mate
rial passes therethrough into a discharge passage
22 formed at one side of the drum. At the bottom
of said passage or chamber 22 is disposed an
auger 23 for discharging the ground material
from the machine in a manner well understood
in this art.
It so happens under the high speed rotation of
the rotor [9 that ?nely ground material is forced
out of the drum adjacent the hinge l4 through 30
the gap between adjacent ends of the screen sec
tions l1 and I2’. This is highly objectionable for
called vertical type having an upright substan
many reasons and; therefore, a seal 24 is pro
vided in the form of a short length of imper
tially cylindrical drum, the inner periphery of
is carried by a cover and removable therewith.
The gap between adjacent ends of the screen
sections. on the cover and in the drum is closed
by a seal in the form of the plate. Securely fas
40 tened to the cover adjacent its hinge, so that,
when the cover is in its closed position, the seal
plate bridges the gap and closely overlaps adja
cent ends of the screen sections.
Within the
drum is mounted the usual rotor carrying periph
45 eral hammers that cooperate with the screen to
reduce the material in process. Of course, the
drum includes means to feed material thereinto
and means to remove reduced material therefrom.
This improved structure is shown in detail in
the accompanying sheet of drawing, wherein:
Figure 1 is a vertical longitudinal sectional
view through a standard type of vertical hammer
mill showing the novel seal structure operatively
associated therewith; and,
55
ment of the drum and cover to illustrate the seal
on a somewhat enlarged scale.
ticable embodiment to a hammer mill of the so
“ which is lined with a screen, a portion of which
50
(CI. 83-11)
Figure 2 is a detail perspective view of a frag
forate sheet metal plate securely fastened by ap
propriate bolts 25 to the end of the screen section
[1 adjacent the hinge M. This plate 24 is locat
ed on the outer surface of the screen IT, as shown,
and has an extended end overlapping the gap be—
tween the adjacent ends of the screen portions. 40
Further, the free end of said seal plate is slightly
turned up, as at 26, for properly guiding the seal
plate on to the adjacent edge of the screen sec
tion I2’ as the cover 16 is swung from its raised
position to its lowered position.
The plate 24 is preferably slightly arcuated, so
that it will ?t down snugly against and conform
to the shape of the screens. It is also desirable
to countersink the heads of the bolts 25 on the
inner face of the screen I’! to leave a smooth 50
surface.
From this disclosure it can now be seen that
the seal 24 snugly overlaps and bridges the
gapped adjacent ends of the screen sections l1
and I2’ when the cover I6 is closed, to prevent 55
2,125,352
blowing out and leakage of material past the
hinge l6 when the mill :is in operation.
It is the intention to cover all changes and
modi?cations of the example of the invention
hereinshown and described for the purposes of
disclosure which do not in material respects con‘!
stitute departures from the spirit and scope of
the invention as covered by the appended claims.
What is claimed is:
j
,
"
'
1. Ina mill comprising a drum'with a portion
thereof pivoted thereonito provide a hinged cover,
and a pluralityf of curved screen sections disposed
therein in end? to end relation to provide a sub
stantially continuous cylindrical screen Within
the drum and‘cover, .a screen ‘section carried by
the cover section abutting a screen section car
end to end position, said seal closely'over-lying
the junction 'of said two screen sections.
35in a mill comprising a drum with a portion
thereof pivoted thereon to provide a hinged cover,
andi'a plurality of curved screen sections dis
posed therein in end to end relation to provide
a substantially continuousi cylindrical screen
within the drum and cover, a screen section car
ried by the cover alt-?itting a screen section car
ried by the drum substantially in alignment with
the hinge paint of the cover, said sections being
thereby separable when the cover is opened;'the
combination with one of the screen sections inf a
seal carried thereby, said seal beingr formed of
imperforate sheet metal and having a portion
thereof curved to provide alrsurface substantially
ried by the druirn substantially in alignment with
as a section of the aforesaid cylinder, being slight
the hinge point of the cover, said two screen sec
tions being thereby separable when the cover is
opened, the combination with'one of the screen
sections of a seal carried thereby, said seal being
formed of imperforate sheet metal and having a
ly curved radially inwardly ltherefrom, said seal
portion thereof curved to provide a surface as a
being then curved radially outward from the
cylinder to providena guide portion for engaging
the adjacent screen section and guiding the ‘seal
thereover when the cover is closed on'the drum,
the screen’ sections being thereby: replaced in
section of the aforesaid cylinder, said seal being
then I'curved radially outward from the cylinder
to provide a guide portion for guiding the seal
normal endjr'to end position, said seai closely over
lying the'vju'nction of said twoscreen sections._
over the adjacent screen section when the cover
is closed on the drum, the screen sections being
thereof pivoted thereon to provide a hinged cover,
and a plurality of curved screen sections disposed
therein in end to end relationto PI'OVidQgEL sub-v
thereby replaced in normal end to end position,
said seal closely over-lying the junction of said
two screen sec-tions,
I
,
2. In a mill comprising a drum with a portion
thereof pivoted thereon to provide a hinged cover,
and plurality of curved screen sections disposed
55 therein in end to end relation to provide a sub
stantially continuous cylindrical screen within
the drum and cover, a screen section carried by
the cover abutting a screen section carried by the
drum, said two screen sections being thereby sep
4. In a mill comprising a drum with; a portion
stantially continuous cylindrical _, screen within
the drum and cover, a screen section carried by
the cover abutting a screen section carriedby
the drum, said sections being thereby separable
when the cover is opened, the combination with
one of the screen sections of a seal carriedltherer,
by, said seal being formed of imperforate sheet‘
metal and having a portion thereof curved ‘to
provide a surface substantially as a section of.
thereby, said seal being formed of imperforate
the aforesaid cylinder, being slightly curved radi
ally inwardly therefrom, said seal being then
curved radially outward from the cylinderv to
provide a guide portion for engaging the adjacent
sheet metal and having a portion thereof curved
screen section and guiding the seal , thereover
40 arable when the cover is opened, the combination
with one of the screen sections of a seal carried
to provide a surface as a section of the aforesaid
when the cover is closed on the drum, the; screen
cylinder, said seal being then curved radially out
ward from the cylinder to provide a guide portion
sections being thereby replaced in normal end
to end position, said seal closely over-lying the
for guiding the seal over theadjacent screen sec
tion when the cover is closed on the drum, the
junction of said two screen sections; a‘
screen sections being thereby replaced in normal
.1;
RAYMOND D. MACDONALD.‘
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