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Патент USA US3091347

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May 28, 1963
c. H. NORDELL
3,091,337
COMMINUTING DEVICE
Filed Nov. 9, 1959
6 Sheets-Sheet 1
May 28, 1963
3,091,337
C. H. NORDELL
COMMINUTING DEVICE
Filed Nov. 9, 1959
6 Sheets-Sheet 3
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May 28, 1963
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COMMINUTING DEVICE
Filed Nov. 9, 1959
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May 28, 1963
c. H. NORDELL
3,091,337
COMMINUTING DEVICE
Filed Nov. 9, 1959
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United States Patent ‘O? ice
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preferred illustrative embodiment of the invention, in
which:
3,091,337
COMMINUTING DEVICE
Carl H. Nordell, Crystal Bay, Nev., assignm- of ?fteen
FIGURE 1 is a front elevational view of a comminuting
percent each to Louise N. Millspaugh and Anne N.
Kaspar, both of Palm Springs, Calif.
Filed Nov. 9, 1959, SerQNo. 851,641
3 Claims. (Cl. 210-173)
This invention relates to a comminuting device, and is
particularly concerned with means for reciprocating a
reversible cutting cylinder along the upstream surface of
a screen ?xed in a sewage channel to remove solids from
said screen, and with a comb adapted to cooperate with
3,091,337
Patented May 28, 1963
GI
device embodying the invention, with the'cutting cylinder
in its lowermost position;
FIG. 2 is a side elevational view of the comminuting
device, looking towards the left side of FIG. 1;
FIG. 3 is a bottom plan view, looking upwardly from
the plane 3~3 of FIG. 1;
FIG. 4 is a top plan view, looking downwardly from
the plane 4—4 of FIG. 1;
FIG. 5 is a fragmentary front view on an enlarged
scale, partly in section and partly in elevation;
said cutting cylinder to comminute solids removed from
FIG. 6 is a fragmentary side view on an enlarged
said screen, regardless of the direction of‘ rotation of said 15
scale, partly in section and partly in elevation, with the
cylinder.
screw for reciprocating the cutting cylinder in its lower
In accordance with the present invention, a screen hav
most position;
ing vertically disposed screen elements is secured in ver
FIG. 7 is a fragmentary view, similar to FIG. 6,
tical position transversely of a channel through which
the sewage ?ows. A horizontally disposed cutting cylinder 20 showing the screw in its uppermost position;
FIG. 8 is a fragmentary vertical sectional view on an
is rotatably mounted in a frame adapted to be moved
enlarged
scale, showing the ball bearing engagement of
vertically relative to the screen, and a stationary comb is
the screw and its nut;
mounted on the frame in position to cooperate with the
FIG. 9 is a fragmentary perspective view on an enlarged
teeth of the cutting cylinder regardless of the direction
of rotation to comminute solids intercepted by the screen 25 scale, showing the engagement of one of the ball bearing
shoes with its track for guiding the vertical movement
and removed from the screen by the cutting cylinder.
of the cutting cylinder;
The supporting frame, which carries the cutting cylin
FIG. I0 is a vertical sectional view, taken along line
der and comb, is reciprocated by a screw operated by the
'10—10 of FIG. 11, showing the ball bearing shoe;
same electric motor that rotates the cutting cylinder. A
FIG. 11 is a vertical sectional view, taken along the
sleeve secured to the supporting frame moves vertically
line 11-11 of FIG. 10;
with it, and carries two spaced projections that engage
FIG. 12 is a cross sectional view, taken along line
limit switches at each end of the vertical travel of the
12——I2 of FIG. 11;
cutting cylinder. The limit switches reverse the motor,
FIG. 13 is a fragmentary side view, partly in section
and thereby reverse the direction of rotation of the cylin
and partly in elevation, showing the stationary comb
der and also reverse the direction of its vertical travel.
35 adapted to cooperate with the cutting cylinder rotating in
The comb comprises a plurality of short comb sections
either direction;
that may be reversed individually when one edge becomes
FIG. 14 is a fragmentary side view, partly in elevation
worn. The comb is so positioned that it cooperates with
the teeth of the cutting cylinder to comminute the solids
carried by the cutting cylinder to the comb, regardless of
the direction of rotation or the direction of vertical move
ment of the cutting cylinder.
and partly in section, showing the reversing switch and
automatic means for operating the switch when a log or
similar obstruction prevents downward movement of the
cutting cylinder;
FIG. 15 is a fragmentary side elevational view of the
If the cutting cylinder engages a log or other solid
comminuting device, with the cutting cylinder moving
too large to be comminuted as it is moving upwardly,
downwardly; and
such solid will fall back into the sewage without damage 45
FIG. 16 is a fragmentary side view, partly in section
to the comminuting device. However, if the cutting cylin
der engages such an obstruction on its downward move
ment, the obstruction may get wedged between the cut
ting cylinder and bottom of the sewage channel. An
obstruction resting on the bottom of the channel may
prevent the cutting cylinder from moving downwardly
far enough to enable the sleeve to engage the limit switch
and partly in elevation, showing the lever for operating the
reversing switch being tripped when an obstruction
prevents downward movement of the cutting cylinder.
Referring to the drawings, the reference numeral 2 in
dicates a sewage channel having a bottom 3 and upstand
ing side walls 4 and 5. A frame‘?, comprising a pair of
vertically disposed channel members 7, a top channel
to reverse the motor. Under such conditions the screw
member
8 and a bottom member 9, is rigidly secured in
continues to rotate, and, since the sleeve cannot move
vertical
position
transversely of channel 2. A screen
downwardly, the nut in which the screw rotates moves 55
10 is rigidly secured in the lower portion of frame 6.
upwardly. A second sleeve connected to the nut moves
The screen shown is provided with vertically arranged
upwardly with it, and trips alever connected to a rod
V-shaped
bars 11, but any suitable screen elements may
which operates the limit switch to reverse the motor, and
‘be used. A track 12 is mounted vertically adjacent each
the cutting cylinder starts on its upward movement before
longitudinal edge of screen 10. A second frame 13 is
any damage can be done to the comminuting device.
60 movably mounted adjacent frame 6 and is provided with
The movable frame is provided with ball bearing shoes
shoes 14, hereinafter described, which engage tracks 12
that ride on a track on the stationary frame in which the
and hold frame 13in proper spaced relationship to
screen is secured, to facilitate the vertical movement of the
frame 6.
cutting cylinder. The screw which lifts the vertically
Frame 13 comprises side plates 15, 16 and a housing
movable frame is provided with ball bearing engagement
17 adjacent the inner surface of side plate 16. Aligned
with its nut to reduce the friction of said lifting screw to
bearings 18 project inwardly from the lower ends of side
a minimum.
plate v15 and housing 17. A reversible cutting cylinder
19 is rotatably mounted in bearings 18. The cutting cylin
der is provided with laterally projecting teeth 2t) adapted
70
fully described in the following speci?cation, taken in
to enter the V-shaped spaces in elements 11 as the cut
conjunction with the accompanying drawings showing a
ting cylinder is rotated. Cutting cylinder 19 is also prefer
The structure by means of which the above-mentioned
and other advantages of the invention are attained will be
3,091,337
ably provided with a plurality of shear bars 21 between
teeth 20.
Side plates 15 and 16 provide a rigid connection with
cutting cylinder 19 and the upper portion of frame 13
so that the cutting cylinder is reciprocated verticaily
with the upper portion of frame 13, as hereinafter de
scribed. A sprocket 22 ?xed to shaft 23 of cutting cylin
der 19 is driven by a chain 24 enclosed in a housing 17.
Chain 24 extends around sprocket 22 and around a
nut 52 remains ?xed relative to collar 53. Since screw
46 is rigidly ?xed to the top of vertical shaft 47, which is
held against vertical movement relative to frame 13, rota
tion of the screw moves frame 13 vertically relative to
stationary frame 6.
Rotation of screw 46 carries ball bearings 61 upwardly
or ‘downwardly along the path de?ned by grooves 59 and
60, according to the direction of rotation of screw 46
when screw 46 moves vertically relative to nut 52.
A
return tube 62 extends through nut 52 and is secured in
sprocket 25 which drives the chain.
10 place by any suitable means, such as, for example, a
As shown in FIG. 5, the upper portion of frame 13
strap 63. The ends of tube 62 engage groove 59 to form
comprises a spacer 26 and a housing 27 secured to each
other in end to end relationship.
Spacer 26 is rigidly
secured to side plate 15 at its outer end, and housing
27 is rigidly secured at its outer end to housing 17. A
reversible electric motor 28 is mounted on the upper side
of housing 27 which has an opening 29' through which
the output shaft 30 of the motor depends. Motor 28
is energized by wires in a ?exible cable 31 connecting it
to a junction box 32 mounted on top member 8 of frame _
6, as shown in FIG. 1. Motor 28 is submersible, and '
cable 31 is waterproof, although normally both of these
members are above the sewage level in the lowermost
position of frame 13.
The lower portion of output shaft 30 is reduced in
diameter, as indicated at 33, (FIG. 5), and is provided
with a worm drive 34. A bearing 35 mounted in the end
of housing 27 adjacent spacer 26 rotatably supports a
shaft 36 having a worm wheel 37 ?xed thereto. Worm
wheel 37 engages worm drive 34 by which it is driven.
The outer end of shaft 36 is reduced in diameter, as in
dicated at 38 and is rotatably mounted in a bearing 39
that is mounted in the outer end of housing 27. The
outer end of shaft 36 extends into housing 17, and
sprocket 25 is mounted thereon. A bevel pinion gear
40 is mounted on the intermediate portion of shaft 36 for
a purpose hereinafter described.
Housing 27 has another opening 41 in its upper side,
and a ?anged collar 42 depends therethrough into the
housing. Two vertically aligned annular bearings 43
that are separated vertically by a spacer 44 are mounted
in collar 42. An annular ring 45 ?tting over the ?ange
of collar 42 engages the top of upper bearing 43 to hold
the bearings and collar 42 against movement relative
to housing ‘27. A screw 46 is rigidly ?xed at its lower
end to the top of a vertical shaft 47 rotatably mounted
a closed path of travel for the ball bearings.
If screw 46 is turned counterclockwise, as viewed in
FIG. 8, it moves upwardly, and the uppermost ball hear
ing 61 is forced into the upper end of return tube 62.
Each ball bearing pushes those ahead of it, so as to form
a continuous pattern of ball bearings moving into the
upper end of tube 62 and out of the lower end of the
tube into the grooves 59, 60. When the rotation of screw
46 is reversed, the ball bearings move into the return tube
at its lower end and out of it at its upper end. if the
vertical movement of screw 46 relative to nut 52 is stopped
while the screw is rotating, nut 52 is moved upwardly
by the screw and moves collar 53. The signi?cance of
such movement will be hereinafter discussed.
As shown in FIG. 6, a second sleeve 64 has its lower
end extending below the upper end of screw 46 and into
collar 53. Sleeve 64 is supported at its upper end by a
block 65. Collar 51 is provided with a pair of vertically
spaced annular sealing rings 66 and 67 which engage
sleeve 64 to prevent water or contaminating material from
getting into sleeve 49. Block 65 is provided with breather
openings 76 and 68, as shown in MG. 14, to allow escape
or entrance of air from or into sleeves 49 and 64.
This
air flows through apertures 69 and 69’ (FIG. 6).
Block 65 is supported by a bolt 70 which extends
through slotted openings 71 in two spaced plates 72 and
73 extending forwardly from top member 8 of frame 6.
Plates 72 and 73 are integral with a base plate 74 bolted
to top member 8, as indicated at 75 in P16. 14. Slotted
openings 71 also permit a slight upward movement of
sleeve 64, under certain conditions, hereinafter described.
As motor 28 rotates screw 46 to move frame 13 up
wardly, it also rotates cutting cylinder 19 to cause teeth
20 on the bottom side of the cylinder to move upwardly
into the V-shaped spaces in screen elements 11, and
then forwardly away from the screen. Teeth 20 transfer
solids from the screen into engagement with a comb 77
in bearings 43. Screw 46 may be integral with shaft 47,
if desired. A bevel gear 48, ?xed to the bottom of shaft
47, is meshed with pinion gear 40 so that motor 28 simul
taneously rotates cutting cylinder 19 on a horizontal 50 that is stationary relative to frame 13. Cutting cylinder
19 and comb 77 are mounted in frame 13. The solids in
axis and screw 46 on a vertical axis.
tercepted by the screen from the sewage ?owing through
Screw 46 is enclosed within a sleeve 49 (FIG. 6) ?xed
channel 2 are transferred from the screen to the comb
at its lower end to a collar 50 and at its upper end to a
by the teeth of the cutting cylinder during the vertical
collar 51. Collar 50‘ is mounted on top of annular ring
45 and is ?xed relative to frame 13. The upper end of 55 movement of the cutting cylinder in both directions.
Comb 77 is adapted to cooperate with teeth 20 of the
screw 46 is threaded into a nut 52 that is located in sleeve
cutting cylinder to comminute the solids that are forced
49. Nut 52 is spaced from the inner surface of sleeve
through notches 78 (FIG. 3) in the comb. The length
49 by a collar 53 into which its upper end is threaded, as
of comb 77 is approximately equal to the length of the
indicated at 54. A lock nut 55 and a washer 56 are
secured to the upper end of screw 46 to prevent separa 60 cutting cylinder, and the comb is arranged to cooperate
with all the teeth of the cutting cylinder. As shown in
tion of nut 52 from the screw. A wear band 57 is in
FIG. 13, comb 77 is mounted in ?xed position in a plane
terposed between the outer surface of collar 53 and the
that is radially disposed relative to the longitudinal axis
inner surface of sleeve 49 to facilitate sliding movement
of cutting cylinder 19. This arrangement of the comb
therebetween.
Frame 13 is moved vertically, relative to frame 6. as 65 causes the forward edge of each tooth 20 to engage the
comb at (approximately) right angles as it enters notch
screw 46 is rotated. The inner diameter of nut 52 is
78, with which it is aligned. The cutting angle between
larger than the diameter of screw 46, as indicated at
the forward edge of each tooth 20 and comb 77 is the
58, FIG. 8. Screw 46 and the inner surface of nut 52
same regardless of the direction of rotation of the teeth.
are provided with complementary helical grooves 59 and
60, respectively. Ball bearings 61, which are positioned 70 The speci?c angular engagement of the forward edge of
each tooth 20 with the comb makes it possible for the
between grooves 59 ‘and 60, are such size that they simul
comb and the cutting cylinder to comminute the solids
taneously engage screw 46 and nut 52. The threaded
continuously during the rotation of the cutting cylinder
engagement between nut 52 and collar 53. indicated at 54,
has much greater friction than the ball bearing engage
in either direction.
ment between screw 46 and nut 52. Accordingly. when 75
The speci?c position of the comb relative to the periph
screw 46 is rotated, it moves relative to nut 52, while
5
3,091,337
cry of the cutting cylinder may be varied with certain
6
side of the machine, the other track 12 is supported in one
corner of a vertical angle member 90 adjacent the outer
forward edges of teeth 20 and the comb must be main~
edge of channel 7. The difference between the means for
tained to obtain efficient cornminution of the solids with
supporting track 12 at opposite sides of the machine is
a ‘single stationary comb during the vertical movement
necessary because housing 17 extends outwardly to the
of the cutting cylinder in each direction. The comb is
outer edge of channel 7 at the second side. Track 12 must
on the side of the longitudinal center of the cutting cylin~
be located beyond the outer edge of housing 17. In addi
der opposite the screen, and preferably its plane is spaced
tion to maintaining a predetermined spaced relationship
not more than thirty degrees from the plane perpendicular
between frames 6 and 13, the engagement of shoes 14 and
to thefaoeof the screen.
track 12 reduces the friction between these frames to a
Combi77 may comprise a single bar of a length ap It) minimum as frame 13 is moved vertically relative to
proximately equal to the length of cutting cylinder 19,
frame 6.
‘but preferably comprises a plurality of short comb sec
Referring to FIGS. 9 to 12 of the drawings, a boss 91,
tions 79 having notches 78 along the edge thereof. The
integral with side wall 15 or 16 and projecting outwardly
comb sections are secured to a suitable supporting mem‘
from said side wall, is provided with threaded bores 92.
ber, such as, forexample, a casing 80, by screws or bolts
Each shoe 14 is mounted on a boss 91 by means of screws
‘81, as shown in FIG. 3. The holes in the comb sections
94 which extend through the shoe and are threaded into
through which ‘bolts 81 extend are preferably slightly
bores 92.
larger than the diameter of the bolt to provide clearance,
Each shoe comprises an inner race 97, an outer race
and to. permit small lateral adjustments of the comb sec
98, and a plurality of ball bearings 99 between said inner
tions relative to the frame to insure accurate alignment 20 and outer races. A screw 96 extending through both
of notches 78 with teeth 20 of cutting cylinder 19.
races is threaded into a spacer 95 which con?nes the
Notches 78 may be provided along only one edge of
ball bearings between said races. Spacer 95 is positioned
comb 77, but preferably are provided along opposite
‘against boss 91 to which it is secured by screws 94. Boss
edges thereof. The provision of notches on opposite
'91 is so located on side plate 115 or 16 that when the
edges ofxthe comb ‘sections permits reversal of any comb
structure is assembled, ball bearings 99 along the rear
section that becomes worn, to present a new comb edge
longitudinal edge of shoe I4 engage track 12. Outer race
to the teeth of cutting cylinder 19. When the second
98 is provided with a flange 100 that extends around its
edge of any comb section becomes worn, it is necessary
entire perimeter except at its rear longitudinal edge. The
‘to replace only a'single comb section 79, instead of re
30 rear edge of outer race 98 is curved inwardly a short
placing the entire comb.
distance, as indicated at 101, FIG. 10, which is sn?icient
in order to facilitate assembly of the comb, comb sec
to retain the ban bearings in the shoe without interfering
tions 79 are preferably grouped together in units of two
with their. engagement with track 12.
limits, ‘but the speci?c angular relationship between the
or more, as shown in FIG. 3. Each group of comb sec
tions is secured to a bar 82 by bolts 83 or any other se
curing means that permit easy removal of individualcomb
sections, as shown in FIG. 3. Small gaps 84 are provided
between'adjacent ends of bars 82, so that the bars will
not interfere with the small lateral adjustment permitted
‘by the clearance between the bolt holes in the comb sec
tions and the bolts passing therethrough.
If'desired, a unit of two or more comb sections may
be reversed without removing any comb section from bar
A reversing switch 102 mounted on one verticai channel
member 7 is provided with a lever 103, pivoted as indicat
ed at 104, FIG. 14, to operate the switch.
An upper
bracket 105 and a lower bracket 106 are rigidly secured
to sleeve 49 in vertically spaced relationship so that one
is above switch 102 and the other is below it. Each of
40 brackets 105 and 106 has a portion projecting from
sleeve 49 far enough to engage lever 103. When frame 13
reaches the predetermined upper limit of its upward move
ment, bracket 106 trips lever 103 and operates switch 102
to reverse motor 28, thereby reversing the direction of
82 when one or more of the comb sections becomes worn.
When a second comb section in any unit becomes worn
it is necessary to remove at least one of the worn sections 45 rotation of cutting cylinder 19 and simultaneousely start
ing the downward movement of frame 13. When the
from bar 82. The worn section may be reversed to pro
vide a new comb edge. If both edges of a comb section
become worn, it is necessary to replace only the worn sec
tion.
Casting 80 is supported in ?xed position by extensions
85 that project forwardly from side plate 15 and housing
17, as shown in FIG. 13. The extensions are preferably
integral with side plate 15 and housing 17, but may be
formed as separate members and secured to said parts in
any suitable manner. The casting may be of any desired
shape, and is provided with a flat surface 86 against which
comb 77 is secured.
In the embodiment illustrated in the drawings, ?at
lowermost limit is reached, bracket 105 trips lever 103 to
operate the switch, thereby reversing the direction of
rotation of cutting cylinder 19 and starting the upward
movement of frame 13.
If an obstruction, such as a log 107 (FIG. 15) that
cannot be comminuted easily, becomes wedged between
teeth 20 and bottom 3 of channel 2 as frame 13 is moving
downwardly, it may stop the downward movement of
frame 13 before bracket 105' reaches a lever 103. Motor
28 will continue operating in the same direction and will
continue to rotate screw 46. Since screw 46 and sleeve
49 are rigidly connected to frame 13 they are also held
against downward movement. Continued operation of
surface 86 comprises one face of a recess in casting 80.
The ?at surface is disposed in a plane that is radially 60 motor 28 therefore causes nut 52 to move upwardly rela
tive to screw 46. The upward movement of nut 52 moves
disposed to the longitudinal axis of cutting cylinder 19.
collar
'53 upwardly, and the collar carries sleeve 64 up
Comb 77, secured to the flat surface by bolts 81, projects
wardly with it.
rearwardly from the rear edge of the casting a distance
A lever 108, pivoted to plate 73, as indicated at 109,
sufficient to allow teeth 20' of cutting cylinder 19 to pass
has one end in engagement with block 65, as shown in
through notches 78 as'the cutting cylinder is rotated. A
FIGS. 14 and 16. Block 65 is moved upwardly by sleeve
plate 87 secured to casting 80 by bolts 88, has one edge
64 to move lever 108 about its pivot 109 as soon as the
abutting the underside of comb 77 opposite the rear edge
downward movement of screw 46 is stopped. A rod 110
of the casting to provide additional support for the
is secured to lever 108 on the opposite side of pivot 109
comb.
and is moved downwardly when the end of lever 188 en~
During the vertical movement of frame 13 relative to
gaged by block 65 is tilted upwardly. Rod 110 extends
frame 6, the proper spaced relationship between the
through aligned apertures 111 and 112 in plate ‘74 and top
frames is maintained by the engagement of shoes 14 with
channel 8, respectively, and is guided thereby in its down
track 12. One track 12 is secured adjacent one edge of
ward movement. The lower end of rod 110 is positioned
a vertical channel 7 by a plate 89 that extends vertically
above lever 103 in close proximity thereto. The tilting
at right angles to one leg of channel 7. At the opposite
3,001,337
7
movement of lever 108 is sufficient to cause rod 110 to
trip lever 103 to operate switch 102 and thereby reverse
motor ‘28.
Reversal of motor 28 starts frame 13 on its
upward movement from the point where the downward
movement thereof was stopped. As cutting cylinder 19
moves upwardly obstruction 107 may be removed from
the screen, and frame 13 may continue its normal travel
relative to the teeth of the cutting cylinder is such that
the solids are comminuted by the interaction of the teeth
and the comb in both directions of movement of the
cutting cylinder.
It is impossible for any obstruction encountered by
the cutting cylinder to jam or break the machine. The
teeth on the upper half of the cutting cylinder rotate
away from the screen as the cutting cylinder moves up
wardly, so that obstructions encountered on the upward
19, housing 27, motor 28, and sleeve 49, all of which 10 movement are pushed away from the screen. Normally
thereafter.
The combined weight of frame 13, cutting cylinder
move vertically as a single unit, exerts considerable force
on lift screw 46 during such vertical movement, par
ticularly when the center of gravity is spaced a consider
able distance from the axis of the screw. The eccentric
load ‘causes excessive moments of force against the ball
bearing screw lift, and thereby increases the wear and
shortens the life of the ball bearing screw lift.
The eccentric load also interferes with proper posi
tioning of the frame and cutting cylinder relative to the
screen. When the cutting cylinder strikes a solid too
large to comminute in one pass it bites out a portion of
the solid and swings outwardly from the screen, as de
scribed in Lannert Patent No. 2,900,082. When the cut
ting cylinder swings back after passing such a solid, un
equal distribution of weight may cause the frame to cock
and thus prevent the cutting cylinder from returning to
its proper position.
If the weight is not distributed properly to position
the center of gravity in proximity to the axis of ball
bearing lift screw 46 a counter weight 113 may be added,
to reduce the moments of force against the ball bearing
screw lift, ‘and to insure proper positioning of the cut
ting cylinder when it swings back into position after
passing a solid that forces it away from the screen.
counterweight 113 may be of any desired shape, but
preferably ?ts substantially within the thickness of chan
nel member 7. As shown, one end of the counterweight
is provided with ?anges 114 to engage the outer edges
of channel member 7 to guide the counterweight in its
vertical movement. The counterweight must be short
enough to prevent its lower edge from engaging the
upper edge of screen 10 when the counterweight is in
its lowermost position. The counterweight is provided
adjacent its opposite edge with a vertical bore 115
through which a guide rod 116 extends. The upper end
of guide rod 116 is secured to top channel member 8,
and its lower end is secured to an angle iron 117 (FIG.
2) extending transversely across frame 6.
The counterweight is secured to one end of a cable 118
that runs over a pulley 119 mounted on top of channel '
member 8. The opposite end of cable 118 is connected
to spacer 26 ‘and is positioned to counterbalance the
eccentric load added to frame 13 by cutting cylinder 19,
housing 27, motor 28, and sleeve 49, and to position the
center of gravity in proximity to the axis of the ball
bearing screw lift to ease the vertical movement of frame
13 and its associated structure. The ball bearing screw
lift works best under some load, and it is preferred to
any obstruction encountered on the downward movement
of the cutting cylinder is also pushed from the screen by
the teeth. However, if the obstruction gets caught be
tween the cylinder and the bottom of the channel the
limit of vertical travel of the cutting cylinder ‘is shortened
until the obstruction is removed.
Although I have described a preferred embodiment
of the invention in considerable detail, it will be under
stood that the description is intended to be illustrative,
rather than restrictive, as many details may be modi?ed
or changed without departing from the spirit or scope
of the invention. Accordingly, I do not desire to be re
stricted to the exact structure described.
I claim:
1. A sewage comminuting device comprising a station
ary screen, a frame reciprocably mounted adjacent said
screen and adapted to traverse said screen, a reversible
cutting cylinder rotatably mounted in said frame for re
moving sewage solids from said screen, means for caus
ing said frame to traverse said screen, means for con~
tinuously rotating said cutting cylinder alternately in
each of two opposite directions, cutting teeth having two
oppositely disposed cutting edges mounted on said cut
ting cylinder and engageable with one surface of said
screen, a single thin ?at comb immovably mounted on
said frame and having a forward surface adjacent said
cutting cylinder, said comb having a rearward surface as
well, said comb lying along a plane in which the longi
tudinal axis of said cutting cylinder lies, which plane also
intersects the rearward and forward surfaces of said
comb, notches of uniform cross section in the forward
surface throughout their depth in said comb, said notches
having oppositely disposed cutting edges, said teeth being
adapted to mesh with the notches of said comb when said
cylinder is rotated in either direction, the edges of said
notches and the edges of said cutting teeth being disposed
to cooperate to comminute sewage solids as said cutting
cylinder rotates alternately in each of said two opposite
directions, switch means operable to reverse the direction
of movement of said frame, and means carried by said
frame to operate said switch means at predetermined
points in the travel of said frame in each direction to re
verse the direction of travel of said frame and the direc
tion of rotation of said cutting cylinder.
2. The device of claim 1 in which said frame recip
rocates upwardly and downwardly with respect to said
screen and in which automatic means are provided to
reverse the direction of travel of said frame when the
counterbalance approximately 75% of the combined 60 downward movement of said frame is stopped in advance
of one of said predetermined points in the travel of said
weight of the frame and associated structure, thereby
leaving about 25% of the load on the ball bearing lift
frame.
screw to prevent slippage of the ball bearings and to re
3. The device of claim 1 wherein there is provided a
tain control of the vertical movement of frame 13.
stationary frame to which the stationary screen is con
In the normal operation of the comminuting device
nected and wherein said automatic means include a rod
constructed in accordance with the present invention, the
adapted to engage said switch means, said rod being nor
cutting cylinder travels continuously between the upper
mally positioned in spaced relationship to said switch
and lower edges of the screen, reversing its direction of
means, and means operated by said means for causing said
vertical travel and its direction of rotation each time it
moveable frame to traverse said screen to move said rod
reaches either the upper or lower edge of the screen. 70 into operating engagement with said switch means when
The teeth of the cutting cylinder transfer the solids inter
the downward movement of said moveable frame is
cepted by the screen from the screen to a single comb.
The comb is stationary with respect to the frame that
stopped in advance of one of said predetermined points in
the travel of said moveable frame.
carries it and the cutting cylinder vertically along the
upstream surface of the screen. The angle of the comb
(References on following page)
3,091,337
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,170,5 619
Montgomery _________ __ Aug. 22,
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FOREIGN PATENTS
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,091,337
May 28, 1963
Carl H. Nordell
It is hereby certified that error appears in the above numbered pat~
ent requiring correction and that the said Letters Patent should read as
correc ted below .
Column 5, line 15, for "easing" read —— casting —-; column
8,
line 63,
for the claim reference numberal "1" read -— 2 ——.
Signed and sealed this 3rd day of December 1963.
(SEAL)
EEIIISIEST W_ SWIDER
Attesting Officer
EDWIN L. REYNOLDS
Ac ting Commissioner of Patents
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