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Патент USA US3030045

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April 17, 1962
w. P. GRUENDLER
3,030,035
GRINDERS
'
Filed March 20, 1958
4 Sheets-Sheet l
FIG. 2
INVENTOR.
WILLIAM P. GRUENDLER
ATT’Y.
April’ 17, 1962
w. P. GRUENDLER
3,030,035
GRINDERS
Filed March 20, 1958
4 Sheets-Sheet 2
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INVENTOR.
WILLIAM P. GRUENDLER
BY
ATT’ Y.
April 17, 1962
w. P. GRUENDLER
GRINDERS
Filed March 20, 1958 -
3,030,035
4 Sheets-Sheet 3
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‘ April 17, 1962
w. P. GRUENDLER
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GRINDERS
Filed March 20, 1958
4 Sheets-Sheet 4
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ited States Patent O?lice
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Patented Apr. 17, 1952
2
3,030,035
William P. Gruentller, (llivette, Mo, assignor to Gru
GllllNDElid
endler Crusher dz Pulverizer (30., St. Louis, Mo., a cor
poration of Missouri
Filed Mar. 20, 1958, Ser. No. 722,738
12 Claims. (Cl. 241-853)
This invention relates in general to certain new and use
ful improvements in grinders, feed mills, and the like.
In grinding and pulverizing machines, such as feed mills,
comprising a series of spaced longitudinal channels 1, 2
which are welded to transverse channels 3, 4-, 5 in the
provision of a box-like base frame 6. Bolted or otherwise
rigidly mounted on the base frame 6 at one end thereof is
a mill housing '7 comprising spaced parallel side walls 8,
9 joined by a polygonal top wall ill, a front wall 11, and
a back wall 12, the latter being provided with a discharge
opening 13.
Mounted in the side walls 8, 9 somewhat centrally
10 thereof are spaced aligned bearings 14, 15 for journaling
a shaft 16 which projects outwardly from the side walls
3, 9. Within the housing 6 the shaft 16 has a plurality
size corresponding to the desired ?neness to which the ma- ,
of axially spaced discs 17 mounted thereon, and extend
terial is being ground. However, in the ordinary course of
ing through the discs 17 are hammer rods 13 for securing
operation of a feed mill, it is frequently necessary to 15 a plurality of hammers 19. The hammers 19 extend radi
change the size of the screen since desired ?neness of the
ally outwardly of the hammer rods 18 so that as the ham
ground material changes depending upon the nature of the
mers 19 rotate with the shafts 16 they will pass in closely
material, and the use for which it is intended. Usually,
contiguous relationship with a grinder plate 26 mounted
the grinder must be completely shut down and partially
on the front wall 11 interiorly of the housing 7. Rigidly
disassembled in order to change screens and such pro 20 mounted on the base frame 6 in spaced relation to the side
cedure is both time-consuming and costly.
wall 8 is a motor mount 2f for supporting a large elec
in connection with grinding and pulverizing relatively
tric motor 22 having a drive shaft 23 which is connected
dry material in a feed mill, it frequently happens that there
to the shaft 16 by means of a coupling 24.
is a certain amount of leakage of dust from the grinder
Mounted on the front wall 11 and projecting forwardly
or mill housing past the screen therein. Such condition 25 and upwardly therefrom is a hopper 25 provided with a
is annoying and unhealthy to Workers in the vicinity of
rotatable shaft 26 having a plurality of feeder arms 27
the grinder, and, furthermore, since many of the materials
projecting radially outwardly therefrom. The shaft 26
‘being ground are combustible when in ?nely divided dust
is provided on one end with a large pulley 23 which is
like form, the presence of the dust represents something
aligned with a small pulley, 29 mounted on the feed mill
30 shaft 16, and trained around the pulleys 28, 29 is a drive
of a fire hazard.
It is, therefore, one of the objects of the present inven
belt 3'0. Also rotatably mounted in the hopper 25 is a.
tion to provide a feed mill wherein the screen may be
second shaft 31 similarly provided with a plurality of
it is necessary to employ a screen having perforations of a
quickly and easily changed without shut-down of the ma
feeder arms 32 and having a gear 33 operatively mounted
chine.
on one end thereof which meshes with a gear 34- mounted
It is also an object of the present invention to provide 35 on the shaft 26.
a feed mill of the type stated wherein the screen can be
Bolted to the back wall 12 around the discharge open
ing 13 is a duct 35 which is, in turn, connected to the in—
It is an additional object of the present invention to pro
take of a fan 36 driven by a motor 37. The fan 36 is also
vide a feed mill of the type stated which reduces the leak
provided with a vertical discharge pipe 38.
age of dust and other small particles from within the 40
Formed in the side walls 8, 9 are aligned arcuate slots
grinder housing to the atmosphere.
39, 4% for receiving a foraminous screen 41 comprising a
With the above and other objects in View, my inven
plurality of perforated sections 4-2, 43, d4, 45 which are
changed by remotely controlled power operated means.
tion resides in the novel features of form, construction,
joined together by mounting chanels 46. The perfora~
arrangement, and combination of parts presently described
tions in the sections 4-2, 43, 154, 45, respectively, are, pref
45
and pointed out in the claims.
erably, of different sizes and each section 42, 43, 44, 45 is '
In the accompanying drawings (four sheets)
approximately the same width as that of the housing 7.
'FIG. 1 is a perspective view of a feed mill constructed
in accordance with and embodying the present inven
tion;
While the screen 41 in the persent embodiment of the
invention is illustrated as having four sections, it should
be understood that a greater or lesser number of sections
FIG. 2 is a side elevational view thereof, partly broken 50 of graduated size may be used. Welded or otherwise rig~
away and in section;
idly secured to the back side of the screen 41 by means
FIG. 3 is a top plan view thereof;
of narrow plate~like ?anges 47 is a plurality of spaced
FIG. 4 is a sectional view taken along line 4-—4 of
parallel rods 48 which are shiftable in slide-forming pipes
‘FIG. 3;
49 mounted in and extending between the side walls d, 9.
55
FIGS. 5 and 6 are fragmentary sectional views taken
The pipes 49 also extend a short distance outwardly of the
along lines 5-5 and 6—6, respectively, of FIG. 2;
' side walls 8, 9 and are, furthermore, positioned radially
FIG. 7 is a fragmentary sectional view taken along
outwardly of the slots 39, 4t) and are provided with longi
lines 7-7 of FIG. 6;
tudinally extending slots 50 for receiving the ?anges 47 as
FIG. 8 is an enlarged fragmentary sectional View of a
best seen in FIGS. 6 and 7. Bolted to the exterior faces
portion of vFIG. 2 and showing the cam bar and switch 60 of the side walls 8, 9 adjacent the slots 39, 46 are arcuate
channel forming part of the present invention;
mounting plates 51, 52, 53, 54 each provided with ?anges
FIG. 9 is a fragmentary sectional view taken along line
9--h of FIG. 8;
55, 56, 57, 58 which are spaced from the side Walls 3, 9,
and snugly con?ned between the ?anges 55, 56, 57, 58 and
FIG. 10 is a diagrammatic view of the screen-shifting 65 side walls 8, 9, are ?brous or rubber-like arcuate sealing
control circuit forming part of the present invention;
and
.
FIG. 11 is a diagrammatic view of a modi?ed form of
screen-driving mechanism.
strips 59, ea, 61, 62, the latter edgewise abutting the screen
All on each side thereof and thereby reduce the leakage of
dust from within the housing 7 when the feed mill A is
in operation.
Welded to the bottom of the screen 41 at each end
Referring now in more detail and by reference char 70
thereof
are downwardly projecting ?anges 63, 64 for jour
acters to the drawings, which illustrate a practical embodi
naling rollers 65, 66, the latter riding on rails 67, 68
ment of the present invention, A designates a feed mill
mounted on the base frame 6. Also mounted on the lower
3,030,035
3
4
edgedf the screen 41 is a rack 69 which meshes with a
spur gear 70, the latter being driven through a worm
126 will shut off and when the cut away 76 moves past the
'
microswitch 85, the latter will close energizing the upper
coil in the relay 94 and close the contacts 96, 97. Then
wheel 71 and worm 72 which is, in turn, driven by a small
electric screen-driving motor 73 having poles r, s, and
as the cut-out 76 passes over the microswitch 84 the
being spaced outwardly from the side Wall 8. Secured to
the lower edge of the rack ‘69 is a cam bar‘ 74‘ provided
closed contacts will be broken shutting oii current from
the energized coil in the relay 95, thereby opening the
adjacent one end with a cam 75 and cut-away 76. Welded
or otherwise rigidly secured to the rail 68 is a channel
contacts 1'82, 103. As soon as the cut away 76 moves
past the microswitch 84 the other set of contactstherein
will become closed, energizing the other coil in the relay
77, the upper end of which is provided‘with a U-shaped
switch channel 78 having four single pole, single throw
10
95, thereby closing the contacts'100, 101. When the cut
microswitches 79, 80, 81, 82 mounted therein, and four
out 7 6 reaches the microswitch 83 the closed contacts will
single pole, double throw microswitches83, 84, 85, 86
mounted opposite the switches 79, 80, 81, 82. One pole
be opened de-energizing the holding coil ofrelay 89 and
cutout holding coil 111 of the push button switch 107,
thus‘ cutting off current‘ to the motor 73 ‘and stopping
of‘ each switch 83, 84, 85, 86 is normally closed. Fur?
thermore, the successive spacing of the microswitches' 15 same. The screen section 45 will then be in operative posi
tion within the housing 7 and the microswitch 79 will be
along the switch channel 78 is preferably equal to the
closed illuminating the position indicator light 124.
width of one of the sections 42, 43, 44, 45. The cam
bar 74 rides in the switch channel 78 so'as to selectively
‘It should be noted that since the relay contacts 90, 91,
96, 97, 100, 101 are now closed, actuation of the push
actuate the microswitches 79, 80, 81, 82, 83, 84, 85, 86,
as best seen in FIGS. 8 and 9, and for purposes presently 20 button switches 104, 105, 106 will deliver current to the
more fully appearing.
motor 73 with proper polarity so that the motor 73 will
rotate in a direction opposite to that previously described
The control circuit for operating the motor 73 is shown
because the polarity of the current applied to the motor
in FIG. 10 and includes a' source of direct current 87 hav
ing a positive pole in and a negative pole n. The circuit
73 is determined by which pairs of contacts are closed in
also includes two double pole, single throw 'relays 88, 89 25 the relays 94, 95, and the closing of the contactsin the
having'contacts 90, 91, 92, 93, two double pole, double
relays 94, 95, are in turn, controlled by the microswitches
throw relays 94, 95 having contacts 96, 97, 98, 99, 100,
84, 85. Thus, wheneither the screen section 44 or 45
is in position in thehousing 7, the contacts 96, 9,7 in the
101, 102, 103a'nd four push-button switches ‘104, 105,
relay 94 are closed and subsequent closing of the push
106,107 provided ‘with holding 'coils 108, 109, 110, 111.
Each push-button switch 104, 105, 106, 107 corresponds
30 button switch 105 will deliver current to the motor in
to one of the ‘screen sections 42, 43, 44, 45'as does each
such polarity 'as to cause the screen 41 to shift to the left,
relay‘88, 89, 94, 95, each microswitch 79, 80, 81, new
reference being'made to ‘FIG. 4, andyposition the screen
each microswitch 83, 84, 85, 86 so that four parallel cir
cuitsare formed for controlling the motor 73. Con
section 43 within the housing 7.
series with the source of current 87 and a corresponding
sections 43, 44 to be positioned within the housing 7 not
withstanding that they may initially be located on either
On the other hand if
the section 42 is in the housing, the contacts98, 99'will
nected ‘in series with the relays 88, 89, 94, 95 and push 35 be closed, and upon closing of the push-button switch
105:, the current polarity will be reversedand cause the
button ‘switches 104, 105, 166, 107'arefou'r'doub1e throw
motor 73 to rotate in the opposite direction and shift the
cut-out relays 112, 113, 114,‘ 115, each vof'which has one
screen to the right, thus moving the section 43 to opera
normally ‘open set of contacts 116, 117, 118,119, in series"
tive position within the housing 7. it will, therefore, be
with the relay coils 120, 121, 122, 123, respectively, and
also in series with one pair of normally-closed contacts 40 apparent‘that the relays 94, 95 control the direction of
rotation of themotor 73 when push-buttons 105, 106 are
of each of the other cut-out relays 112, 113, 114,115.
The'microswitches 79, 80, 81, 82 are each connected in
depressed and, therefore, permit the intermediate screen
position-indicator lamp 124, 125, 126, 127. It ,will be
apparent ‘that the various relays 88, 89, 94, 95, 108, 109,
110,111 and position indicator lamps 124, 125, 126, 127
may‘be'housed in a suitable control box at a point remote
from the feed mill A and connected by electric cables to
45 side of the housing 7.
I
It should also be noted that when the push-button
switch 102 was closed, as previously described, the relay
coil 120 opens the three normally closed contacts in the
relay 112 which provides a break in the circuits of the
In FIG. 10 the screen 41 is shown in the second position, 50 remaining push-button switches. Thus, if after the switch
that is, with the section 43 disposed within the housing 7
102 is depressed and before the screen has stopped mov
ing, one of the other push-button switches is depressed,
as""shown' in 'dotted lines in FIG. 4." Thus'material fed
into the hopper 25 will be pulverized and when ground
no current will be delivered to the motor 73 or to the
to the proper size will be sucked through the screen-section
holding coil, and, consequently, short circuits in the con
43 by the fan 36 and discharged through the pipe 38. In 55 trol system are eliminated due to accidental closing of
more than one push-button switch.
the control circuit, the microswitch 81 will be closed. by
the motor 73 and sWitches79, 80, 81, 82, 83, 84, 85, 86.
the cam 75,; thereby illuminating the positionéindicator
If it is then desired to position the screen section 42
within the housing 7, starting from the position Where
lamp 126. The push button switch 105 will be open since
the section 43 is in the housing, the push-button switch
no current is flowing through the'holding coil 109 and
the microswitch 85 will be in the “neutral” position since 60 104 is depressed causing current to flow through the relay
it “is opposite the cut-away 76. Similarly the contacts 96,
contacts 90, 91, the holding coil 108 and the motor 73,
which will rotate and shift the screen 41. The relay con
97, 98, 99 will all be open since no current is ?owing
through either coil in the relay 94.
tacts 102, 103, 92, 93, will be closed. It is to be noted
If, during the operation of the feed mill A, it is desired
that the contacts 90, 91, are included in the circuitry so
to position the screen-section 45 within the housing 7, 65 that the pole s of the motor 73 will always be negative
the push-button switch 107 is depressed causing current
to ?ow through the relay contacts 92, 93, the holding coil
111 and motor 73 which begins to rotate and shift the
screen 41. The pole s of the motor 73 will become posi
when the cam bar 74 is positioned over any of mic-ro
switches 83, 84, 85, if the push-button 104 is depressed.
As the micro-switches 83, 84, are normally closed, cur
rent will then ?ow through the relay coil 123 closing the
tive and the pole 2' will become negative. Current also 70 normally open contact 119 and opening the normally
closed contacts on the relay 115. When the ‘screen 41
?ows through the relay coil 120 closing the normally open
shifts, the cam bar 75 will move to the left, reference
contacts 116 and opening the three normally closed con
being made to FIG. 10, allowing the micro-switch 85 to
tacts on the relay 112. As‘ the screen 41 shifts, the cam '
close, in turn closing the relay contacts 98, 99. As the
bar 74 will move along the switch channel 78. As soon
as ‘the cam 75 "moves past the microswitch 81 the lamp 75 cut-away 76 passes over the micro-switch 86 the closed
5
3,030,035
contacts will be broken de-energizing the coil in the relay
83 and breaking the contacts 90, 91, and thereby cutting
out the holding coil 198 of re push-button 1114. Current
supplied to the motor 73 will be cut off and the motor 73
will then stop as the screen section 42 is positioned within
the housing 7. As the switch 82 will be closed, the indi
cator light 127 will be illuminated.
The operation of positioning the screen section 44 in
the housing 7 is similar to the previously described opera
6
it is engaged and the crank 141 actuated to rotate the
drum 139 in either direction and thereby position the ap
propriate screen section 42, 43, 44, 45 within the hous
ing 7. When the desired screen section is in position the
notch corresponding thereto will be aligned with the spring
biased pin 147 which is then released so as to snap into
said notch and lock the screen-section in position.
‘In connection with the screen-driving system shown in
FIG. 11, it will be apparent that the drum 139 may be
tion concerning screen section 42 and screen section 45. 10 mounted at locations remote from the housing 7 other
Again, assuming that the screen section 43 is positioned
than the floor and the cable 139, pulleys 133, 134, 135,
in the housing 7, the push-button 1116 is depressed caus
136, and cable guides 131, 132 appropriately positioned
ing current to flow through relay contacts 192, 193, hold
so that the cable 130 is trained around the drum 139 in
ing coil 110, and motor 73 shifting the screen. It is to
‘the manner previously described. Thus, the drum 139
be noted that since the contacts 192, 183, are closed the
may be one the same ?oor as the housing 7, or in fact,
polarity of the motor 73 will be such that the pole s is posi
the drum may be mounted at any point remote from the
tive and the pole r, negative, causing the motor to shift
housing 7 depending upon the requirements of the par
the cam bar 74 to the right, reference being made to
ticular installation of the feed mill A.
FIG. 10. As the cam bar 75 moves past the micro-switch
It should be understood that changes and modifications
35, it Will cause and the cut-away 76 will pass over the 20 in the form, construction, arrangement, and combination
micro-switch 84. The contacts of the micro-switch 84 will
of the several parts of the grinder may be made and sub
be broken and shut off current from the core in the relay
stituted for those herein shown and described without de
95, opening contacts 192, 103, thus de-energizing the
parting from the nature and principle of my invention.
holding coil of relay 95, cutting out the holding coil 116,
Having thus described my invention, what I claim and
and thereby cut oif current to the motor 73.
The cam 25 desire to secure by Letters Patent is:
bar 75 will cause the lower contacts of the micro-switch
85 to close as it passes, thereby closing the contacts 96,
97, on the relay 94. It can be seen that if the push
button 1115 is depressed the pole r of the motor 73 will be
positive and the pole s will be negative causing the cam
bar 74 to move to the left. As the micro-switch 30 will be
closed when the cut-away 76 passes over, the indicator
light 125 will illuminate.
l. A grinder comprising an arcuate screen, a housing
having a pair of spaced walls provided with aligned
arcuate slots conforming in shape to the cross-sectional
shape of the screen, a plurality of tube members extend—
ing axially across the housing at annularly spaced intervals
along the slots in diametrically spaced relation to the
screen, said tube members also extending between said
walls adjacent said slots and projecting axially beyond
‘For purposes of illustration in order to describe the
the walls on opposite sides of the housing, and a screen
operation of positioning screen section 43 in the housing 35 projecting through said slots and having a plurality of
7 it can be assumed that the screen section 45 is within
the housing 7. The push-button 195 is depressed causing
perforated sections adapted for selective disposition with
in said housing, said screen also being provided with a
plurality of rods slidable in said tube members.
2. A grinder comprising an arcnate screen, a housing
the screen section 43 and cam bar 74 to the left. Since
having a pair of spaced walls provided with aligned aper
the contacts as, 97 are closed, the pole r of the motor 73
ture slots conforming in shape to the cross-sectional shape
will be positive and the pole s Will be negative. As the
of the screen, a plurality of tube members extending
cam bar moves past the micro-switch 79 the lamp 124
axially across the housing at annularly spaced intervals
will shut 011 and when the cut-away 76 moves past the
along the slots ‘in diametrically spaced relation to the
micro-switch 83, the latter will close, energizing the coil 45 screen, said tube members also extending between said.
in the relay 89 closing the contacts 92, 93. As the cut
walls adjacent said slots and projecting, axially outwardly
current to ?ow through the closed contact 97, the hold
ing coil109, and the motor 73 that will rotate and shift
away 75 passes over micro-switch 35, the closed contacts
will break and thereby shut 011 current from the energized
beyond the walls, and an arcuate screen projecting through
said slots and having a plurality of perforated sections
coil in the relay 94, and opening contacts 96, 97. The
adapted for selective disposition within said housing, said
holding coil of relay 94 will be de-energized and cut out 50 screen also being provided with a plurality of {rods slid
holding coil 1119 of the push-button switch 195. The
able in said tube members.
screen section 43 will then be in operative position Within
3. A grinder comprising an arcuate screen, a housing
the housing 7 and as micro-switch 81 is closed the indi
having a pair of spaced walls provided with aligned
catorlight 126 will be illuminated.
arcuate slots conforming in shape to the cross-sectional
‘It is also possible to provide a modi?ed form of driving 55 shape of the screen, a plurality of tube members extend
system for the screen 41 as shown diagrammatically in
ing axially across the housing at annularly spaced intervals
FIG. 11 in which the opposite ends of the screen 41 have
a pair of eyelets 128, 129 for anchoring the opposite ends
of a cable 130.
The cable 139 passes through cable
along the slots in diametrically spaced relation to the '
screen, said tube members also extending between said
walls adjacent said slots and opening at their ends ex
guides 131, 132 and is also trained around pulleys 133, 60 teriorly of the walls, said tube members being split along
134, 135, 136. The cable guides 131, 132 and pulleys
their lengths, a screen projecting through said slots and
133, 134, 135', 136 may be mounted on suitable building
having a plurality of perforated sections adapted for se~
columns 137, 138 so that the cable 130 may extend up
wardly to a building ?oor F the latter being above the
floor F’ on which the base frame 6 is mounted. The cable
139 extends upwardly of the floor F and is wrapped
lective disposition within said housing, a plurality of rods '
slidable in said tubes, and a web connecting each rod to
the screen, each web projecting through the tube member
at the split therein.
around a drum 139 which is rotatably mounted in a sup
4. A grinder comprising an arcuate screen, a housing
porting stand 140, resting on the ?oor F. The drum 139
having a pair of spaced walls provided with aligned ar
is provided with a crank 141 and also with a ?ange 142
cuate slots conforming in shape to the cross-sectional
having four notches 143, 144, 145, 146 spaced 90 degrees 70 shape of the screen, a plurality of tube members extend
apart and corresponding to one of the screen sections 42,
ing axially across the housing at annularly spaced inter
43, 44, 45. Provided for releasable locking engagement
vals along the slots in diametrically spaced relation to
with any one of the notches 143, 144, 145, 146 is a spring
the screen, said tube members also extending between
biased pin 147. Thus, when it is desired to shift the
said walls adjacent said slots and opening at their ends
screen 41, the pin 147 is released from the notch in which 75 exteriorly of the walls, said tube members being split
8,636,655
along-their lengths, a screen‘projec'ti'rig through said slots
and vh'avin'g a plurality of perforated sections adapted
housing {between said slots, said tubes being spaced from
for s'el‘ectivedisposition within said housing, a plurality
of rods slidable in’ said tubes, at web connecting each rod
an arcuate screen slidable in said slots ‘and having a plu
rality of axially extending support members having a
cross-sectional shape conforming to the interior cross,
sectional shape of the tubes and being slidably mounted
therein, said screen having a plurality of axially spaced
tothe screen,‘ each web'projecting. through the tube mem
her‘ at the split therein, and power-operated means for
driving said screen alongsaid tube members.
_
,
5 A' grinder comprising’ an arcuate screen, av housing
each other at intervals along the periphery of the slots,
C1 .
perforated sections, power-operated means mechanically
having‘ av pair of spaced walls provided, with aligned ar
- connected’ to said screen for shifting said screen in said
euate slots conforming in shape to the cross-sectional 10 slots,.and electrical control ‘means electrically connected
shape‘ of the screen, a plurality of tube members extend
to said power-operated means, said control means in
cluding a plurality ofselector switches electrically con~
ing axially across the housing" at annularly spaced inter
reacted -to'_ the power-operated means for actuating said
vals along the‘ slots in diametrically spaced relationto .
power~operated means and causing the latter to position
thescreen, said tube members also extending between
any preselected section within the housing.
said walls‘ adjacent said slots andopening at their ends
9_. A grinder comprising a housing, having a pair-of
exteriorly of the walls, said tube members being split
along their lengths in the provision of an inwardly open~
spaced walls provided with aligned arcuate _slots,_ a plu
ing lnegthwise extending guide-way, a screen projecting
rality of axially slotted tubes extending through thehous
through said slots and having a plurality of perforated
. ing between said slots,isaid tubes being spacedfrom each
sections adapted'for selective disposition within'said hous
other at intervals along the periphery of the slots, an ar-,
ing, a plurality of rods slidabie in said tubes, a web con
cuate screen slidable in said slots and having a plurality
necting each rod to the screen, each Web projecting
through the‘guide-way of the tube member with which it
of axially extending support members‘having-a cross
ofiaxially' extending. support members .having across
section within the housing. ,
‘ , . 10. A grinder comprising ayihousingihavingla pair ofv
sectionalshape conforming to the interior cross-sectional
shape of the tubes andbeing slidably mounted therein,
is'asso'ciated,'and sealing .means mounted on said walls
25' said screen having a plurality of axially spaced perforated
and disposed over the slots,
,
.
.
_
M ‘_ I
,_;6. A grinder comprisinga housing having a pair of
sections, power-operated means mechanically connected;
spaced'wallshpr'ovided with aligned arcuate'slots, a plu
to said screen for shifting said screen in said ‘slots, and‘
rality of axially slottedutubes extending’ through the‘ elcctrical_,_control _rn_eans electrically connected topsaid,
hcusing between saidlslo‘ts, said tubes being spaced from power-operated means, saidcontrol meansincluding a
each other at intervals'v‘alongwthe periphery" of the slots,‘ plurality of selector switches electrically connected to the,
power-operated means?for actuating said power-operated
ap'd ., opening at‘, their ends: exteriorly of the housing, an,
means and causing the latter to position any preselected
arcuzltescreenslidable said slots and having a plurality,
sectional, shape conforming to the interior cross-sectional
shape of the tubes andbei‘n'g slidably,mounted'therein,
said screen'havirig‘a‘plurality of axially spacedperforatedv
sections, power-,operated'means; mechanically connected
to said screen for shifting [said screen in said slots, avpush
button switch electrically connected to each section, and
a, relay'switch“electrically connected ‘to said push-button
switch and being 'pr'ovidedwith a holding coil iforlholdn-u
spaced walls provided with aligned arcuate slots, a plu-=
rality of, axially slotted tubes. extending through the
housingbetween said slots, said tubes being spaced from,
each other at intervals, along the periphery of/the slots
and opening at their ends exteriorly of the housing, an
arcuate screen slidable insaid slots and having a pl-u-v
rality of axially. extending, support members having a
cross-sectional shape conforming to the interior cross-,
sectional shape ofv the tubes and being slidably mounted
switch, in turn, being connected to said power-operated
therein, said screen havinga plurality of axially spacedper
means ‘foractuating the power-operated means and cans
ing the latter to automatically position, any one of the 45 forated sections,powerroperated means mechanically con-,_
ing said pushebutton switch in actuatedposition, said relay _
sections within’ the housing upon closing-of the switch
related
thereto._,
.,
.
_
_
H
,
I
77L In a' grinder comprising a housing having a pair of
spaced wallsprovidedwith aligned slots, auscreen slid
nected to said screen for shifting said screen in said slots, ,
and electrical control means, electricallyconnected to
said power-operated means, said control means mechani»
cally related to each section including, a switch elec~
able in said aligned slots and having a plurality of per
trically connected to thepower-operated means for ac
forated sections; electric motor-operated meanstfor shift
ing said screen in said slots,',control means operatively
associated'with ‘the electric motor-operatedvmeans to se
lectiv'ely dispose any ~onetoffsaid sections Within the ,hous-v
ing','said'control means including an element rigidly mount
eded on‘and extending axially along the screen, said
elementhavin'g a pr'otuberant shoulder disposed ‘at a'se
tuating the powenoperated means and causing the latter to ,
cate'd‘alo'ng the p'ath'of movement of said protuberance
for actuationthjereby depending upon the position and
of. theslots and openingiat their ends exteriorly of the -
movement of the protuberance, each of said switches
having a plurality of axially extending support members
having a cross-sectional shape conforming to the inte
lected point along its length, a'plurality of'switcheslljo
‘being associated uniquely with one of the perforated
sections of the screen and being so located along the path
of movement of 'tlie'screenfas to be ‘shifted into circuit
automatically position any one of the sections within
the housing upon closing of the switch related thereto.
11. A grinder comprising, ahousing havinga pair ,of
spaced walls provided with alignedarcuate slots, a plu
rality of axially slotted tubes extending through the house,
ing between said slots,’ said tubes being spaced from each.
other at uniformly-spaced intervalsalong the peripheryv
housing, an arcuate .screen slidable in said slots and -
rior cross-sectional shape of the tubes and being'slidably
open position when the particular perforated section with ' 65 mounted therein,’ said screen having a plurality of axi
ally spaced perforated sections, power-operatedmeans
which it is associatedis positionedwithin. the grinder
housing‘,'arid ‘a manually operable circuit-closer associated
with each of said ‘switches and being in series with said
switch and the electric motor so that a circuit can be
mechanically connected to said screen for shifting said
screen in said slots, electrical control means electrically.
connected to said power-operated means, said control
completed to the electric motor by manual operation of 70 means mechanically related to each sectionand including
a switch electrically connected to the. power-operated
the circuit-closer ‘whenever the switch with which it is
associated is in closed position.
means for actuating the power-operated means and caus
8. A grinder comprising a housing having a pair [of
ing the latter to automatically position any one of the“
sections within the housing upon closing'of the ‘switch
rality of‘iaxially slotted‘ tubes'extending through the 75 related thereto, and position-indicator means responsive
spaced walls provided with aligned ,arcuate slots, a plu
3,030,035
10
to movement of said screen for signaling which of said
cross-sectional shape conforming to the interior cross
sections is within said housing.
12. A grinder comprising a housing having a pair of
spaced walls provided with aligned arcuate slots, a plu~
rality of axially slotted tubes extending through the hous 5
ing between said slots, said tubes being spaced from each
other at intervals along the periphery of the slots and
opening at their ends exteriorly of the housing, a plurality
of slide-forming members extending between said walls
adjacent said slots, and a screen projecting through said 10
slots, said screen having a plurality of outwardly extend
ing narrow ?anges rigidly attached thereto‘ and a plu
sectional shape of the tubes and being slidably mounted
therein, said screen having a plurality of axially spaced
perforated sections adapted for selective disposition With
in said housing.
rality of axially extending support members integrally
formed on said ?anges, said support members having a
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,227,090
2,258,537
2,661,159
2,669,396
2,732,137
Hughes _____________ _._ Dec. 31,
Calkins ______________ _. Oct. 7,
Thomas _____________ ..._ Dec. 1,
Nickle ______________ __ Feb. 16,
Fisher ______________ __ Jan. 24,
1940
1941
1953
1954
1956
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