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Патент USA US2133211

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OCÍ. 11, 1938.
Filed May 1, 1957
Patented Óct. 171», 1938
~ -
Charles F. Schutte, Bulïalo, N. Y.
Application .Maya 1937, se?iárNo. 140,263'
2 Claims. (Cl. 83-11)
This invention relates to grinding mills and a. casing l enclosing the grinding mechanism,
more particularly toa feed table adapted to be not shown, but which may be of any of the usual
‘associated with a grinding mill and over which types. `As is customary in mills of this general
- the material to- be ground passes prior to its character, the casing isair tight except for an
5 introduction into the mill.v
opening 2 adjacent vits top through which ma
An important object of my invention is to pro
terialis introduced into the mill and is provided
vide a feed table adapted to be used in conjunc
tion with mills of the type having a closed casing
surrounding the grinding mechanism and con
10 nected to an exhaust fan for pneumatically re
moving the ground product therefrom, said feed
table incorporating means for separating heavier
foreign bodies, such as tramp metal, stones and
glass, from the lighter material entering the
mill. An advantageous feature of my feed table
is the provision of an initial feed chute and a
»shelf so constructed and arranged relative to the
feed chute, that the kinetic energy of the heavier
bodies accompanying the material discharging
20 from the feed chute, as well as the draft created
by the fan, results in an effective separation of
detritus from the material.
Another object of my invention is to provide
a feed table of the above character in which the
25 shelf is- disposed `beyond and spaced from the
discharge end of the feed chute and inclined so
as to form a pocket to receive the material pass
ing into the mill, the arrangement being such
that the heavier foreign bodies collect in the
pocket while the lighter material lodging upon
the shelf reverses its direction of flow and spills
over a lip into a passage'extending beneath the
shelf. and communicating with the interior of
the mill.
for pneumatically removing the finely ground
material from the mill and delivering it to a’
collector or separator, as isÀ well understood in
the art.
" In the grinding of certain classes of material,
such as grain, it is not unusual for suchcmaterial
in the bulk form in which it is received at the 15
plant for grinding to include foreign bodies, such
as tramp metal, stones'and glass, which should
not be permitted to enter the mill, either because
of the possible damage they may cause to the
grinding mechanism or because of the undesira 20
bility of. their presence in the ground productde
livered from the mill.
For separating such foreign bodies from- the
lighter material feeding into the mill, there is
provided a feed table ll‘disposed at an inclination
>and having its lower end extending into the
opening 2 adjacent the top’of the mill casing.
Theî feed table is made of .heavy sheet metal
and, as best shown in Fig. 2, vcomprises a pair of
side walls 5 extending throughout its length and
a bottom portion 6 .extending between the side Y
walls 5 and constituting therewith a feed chute
A for receiving material for introduction into the
mill. The> bottom 6 does not extend the full
The invention has as a further object to pro
vide a feed table of the above character includ
ing an upright plate at an end of the shelf re
length of the feed table but beginning at the ele
vated material-receiving end of the table it slopes
downwardly for the-major length ofthe feed
mote from its lip and disposed in the path of the
material discharging from the feed chute, this
plate being removable to permit the material t0
flow directly into the mill without separation.
ltable and terminatesviin ' a straight> edge 6a.
Located at an'elevation below and in a plane
approximately'parallel tothe bottom 6 is a flat
shelf `v>l, this shelfPbeing Vdisposed beyond the
Y ther objects and advantages will be apparent
end of the feed ~chute'.v The lshelffis provided
from the following detailed description of a
with a narrow upright lip 8 upon one end which
preferred embodiment of. the invention, reference
is located directly below the straight edge 6a
of. chute A but with respect to which it provides 45
45 being had to the accompanying drawing in
Figure 1 is a view in side elevation of a ham
mer mill having a feed table associated therewith
for separating heavy foreign bodies from the
50 material passing into the mill;
Figure 2 is a perspective view of the feed table;
Figure 3 is a vertical cross-section through the
feed table illustrating its mode of operation.
with an exhaust fan 3 communicating at onel
end of the mill with the interior of the casing
In Figure 1 is illustrated a hammer mill having
a short space or gap B.
4The end of the shelf which is located remote
from the end of the chute terminates in an edge
9 located inwardly of thelower or discharge end
of the feed table. For closing the end of the
shelf adjacent the edge 9 is an upright plate l0
slidable Within guide slots Il provided along the
vertical edges of ears I2 upstanding from the
upper edges of the side Walls 5 of. the feed table.
The plate may thus be manually raised and lilV
lowered onto and off of the shelf lI. This plate
when in lowered operative position constitutes
the shelf 1 will constitute in effect a continuation
of the feed chute A, and the passage C will act
a vertical wall located in the path of the ma
as a by-pass only for such material as may inci
terial flowing from the discharge end of the
chute and forming with the shelf a closed pocket
for the reception of material discharged from
the chute, as indicated in Fig. 3.
dentally drop down through the gap B.
Manifestly various changes in construction and
design may be made in the feed table described
above, which represents one embodiment of the
invention, Without departing from the spirit of
Below the shelf is a second bottom I3 ex
tending between the sides 5 of the feed table
and forming therewith a closed passage C ex
tending from the space or gap B between the
adjacent ends of the feed chute and the shelf
to that end of the feed table communicating
with the interior of the mill casing. As will be
apparent from Fig. 2, the side walls 5 of the
feed table are dropped or widened to provide
space for the passage C below the shelf and the
` bottom I3 is joined to the bottom 6 of the feed
chute a spaced distance inwardly of its edge 6a
20 by an inclined portion I3a closing the end of
the passage. The feed table is pivotally sup
ported in position upon the casing of the mill by
>means of bolt I4 passing through suitably pro
vided openings in the mill casing and through a
sleeve I5 rolled from the bottom I3 at its end
which projects within the feed inlet 2 of the
mill. A strut I6 extending between the mill cas
ing and the outer or elevated end of the feed
table serves to provide support for the latter
and to allow adjustability of the inclination of
the feed table.
A cleanout opening I'I formed in a side Wall 5
of the feed table adjacent the end of the inclined
shelf which is closed by the plate II) affords
means for removing debris accumulating upon
the shelf. A pivoted cap I8 is suitably pro
vided to maintain this cleanout opening closed.
As indicated in the cross-sectional view of Fig.
3, material passing oif the discharge end of the
40 chute A strikes the upright plate I0 and lodges
on the shelf 'I where it banks up against the
plate in the sloping manner shown. Heavy
bodies such as pieces of metal, stones or bits of
glass, accompanying the material will under the
force of gravity embed themselves deeply in the
layer of material reposing on the shelf, While
the lighter material will slide over the lip 8 at the
open end of the shelf and into the passage C
under the combined influence of gravity and the
current of air (shown by dotted lines in Fig. 3)
being sucked into the mill by the fan F through
the restricted space B intermediate the discharge
end of the chute and the adjacent end of the
shelf. As the lighter material is continuously
removed from the shelf the heavy bodies will
remain behind and accumulate in the pocket
formed by the inclined shelf and the upright slide
I0 and these foreign bodies may be removed from
time to time through the cleanout opening I1.
When no separation is to be made all that is
necessary is to raise or remove the slide plate I0
so as to allow the material to flow directly off
the edge 9 of the shelf into the mill, in which case
my invention.
I claim:
1. A feed table for use in conjunction with
grinding mills of the type having an enclosing
casing, said feed table comprising a pair of side
walls, _an inclined elongated bottom extending be
tween the side walls for a portion of their length 15
and forming therewith an open-topped chute for
the gravitational feed of material therealong, a
shelf extending between the side walls, said
shelf being arranged at an inclination corre
sponding to the bottom and located at an eleva
tion below and projecting forwardly beyond the
lower end of the chute so as to provide a re
stricted opening between the adjacent ends of
the chute and the shelf, a Wall normally clos-A
ing the lower end of the shelf for intercepting
material discharged from the lower end of the
chute but said wall being so arranged to be
moved to non-intercepting position, a second bot
tom located a spaced distance below the shelf
and extending between the side walls to form a 30
passage below the shelf, said second bottom be
ing arranged at an inclination corresponding to
the first-mentioned bottom and being open at its
lower end so as to discharge intothe casing, and
an end wall closing the upper end of the passage 35
but providing communication between the pas
sage and the restricted opening between the ad
jacent ends of the chute and shelf, whereby heav
ier bodies accompany the material passing down
the chute are forcibly discharged against and
embedded within the sloping face of the material
filling the shelf.
2. A separating feed table for grinding mills
and the like comprising an inclined chute for
cooperation with the feed entrance of the mill,
said chute having upstanding side walls with an
upper inclined bottom Wall at the outer portion
of the chute followed by a lower bottom wall
similarly inclined and extending in a plane below
the plane of the first bottom wall and to the in
ner end of the chute, a similarly inclined shelf
extending in a plane between the planes of the
two bottom walls of the chute, said shelf having
one end adjacent to but spaced from the first
bottom wall and having an upright wall ex
tending upwardly from the other end thereof
and forming therewith a separating pocket for
receiving heavier objects as they pass down the
chute, said upright wall being removably mount
ed whereby to permit direct passage over the 60
shelf to the feed entrance upon removal of the
upright wall.
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