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Oct. 22, 1946.
Filed May 26,, 1945
FIG. 1
.5 Sheets-‘Sheet l
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Oct. 22, 1946.
2,409,646 .
Filed May 26, 1945
s Sheets-Sheet 42
72 75
87 51 '
29 50 .57
Patented Oct. 22, 1946
HarryjJ. Seaman, Milwaukee, Wis. "
Application May 26, 1943, Serial No. 488,539
3 Claims. (Cl. 259-6)
An object of the invention is to provide an im
proved machine for effecting a thorough and ex
swingably mounted. on a transverse horizontal
pivot 20 adjacent to the power unit, so as to per
mit the tubular member and attached gear, hous
ing to be swung in a vertical plane. The end‘ of
the shaft ll within the gear housing carries a
peditious‘ mixing and pulverizing of road-build
bevelapinion 2 I, Fig. 2, which meshes with a bevel
The present invention relates to mixing ma
chines adapted for preparing road‘materials' and
the like.
ing aggregates and for uniformly incorporating
gear 22 on a transverse horizontal shaft 23 jour
therewith a stabilizing material such as a bitu
minous binder.
Another object is to provide a mixing machine
having simple but effective means for permitting
nalled in the gear housing. A sprocket wheel 24
is carried on the shaft 23 exterior to the gear
housing for driving mechanism hereinafter de
scribed. The swingably mounted gear housing is
yielding of a mixing rotor thereof upon encoun~
retained at a selected elevation by a bolt 25 en
tering obstructions in the material or excessively
gaging a supporting plate ‘26 on the frame, the
plate having a series of openings 21 for selectively
heavy loads.
A further object is to provide a mixing machine 15 receiving the bolt.
having simple and durable means for driving a
plurality of mixing rotors.
A conveyer 28 of the belt or apron type extends
between the inclined frame stringers II and I2
A still further object is to provide a mixing
and comprises a series of overlapping cross slats
machine which can be inexpensively manufac
29 secured to a pair of side chains 39. The chains
tured, which is reliable in operation, and which 20 pass over sprocket wheels 3! and 32 carried on
will permit ready access to operating parts.
respective horizontal shafts 33 and 34 which are
The invention further consists in the several
journalled in self-aligning bearings 35 and 35
features hereinafter described and claimed.
secured to the underside of the stringers H and
‘ In the accompanying drawings, illustrating cer- - ‘
I2 near the opposite ends of these stringers. The
tain embodiments of the invention,
25 conveyer has a straight, inclined upper run form
Fig. 1 is a side elevation of one form of mixing
machine constructed in accordance with the in
ing an elevator, the side chains 39 of this portion
of the conveyer riding on trackways 31 secured
to the frame. The lower conveyer shaft 34 is
Fig. 2 is a longitudinal sectional elevation of the
adjustable to take up wear and slack in the con
30 veyer, The upper conveyer shaft 33 has a
‘Fig. 3 is a transverse sectional view, taken gen
erally along the line 3-3 of Fig. 2;
' Fig. 4 is a detail top view of a mixing rotor and
its mounting;
Fig. 5 is a view similar to Fig. 2, but showing
a modi?ed form of mixing machine;
Fig. 6 is a transverse sectional-elevation ‘of the
machine of Fig. 5, taken generally along the line
6—"Ei of Fig. 5, and
Fig. 7 is a sectional View taken generally along 40
the line l—'! of Fig. 5.
Referring to the construction shown in Figs. 1
to i,’ ii] designates a frame which includes par
allel inclined stringers H, l2, and I3 at its upper
portion and further includes horizontal bottom
skids l4 permitting the frame to be detachably
sprocket wheel 38, Fig. 3, secured to one end there
of and connected by a chain 39 to a small sprocket
wheel ‘Ml on a shaft 4|, Fig. 2, the chain drive
being enclosed in a housing 42. The shaft 4| is
intermediate and parallel to the conveyer shafts
33 and 34 and is journalled in self-aligning bear
ings 43 secured to the frame stringers II and I2.
A large sprocket wheel M, Figs. 1 and 3, is secured
to the end of the shaft 4| distant from the
sprocket wheel 40.
Extending transversely above the upper run
of the conveyer are two power-driven mixing
rotors 45 and 45, the axes of rotation of the rotors
being approximately horizontal and being spaced
longitudinally of the stringers and arranged at
opposite sides of the vertical plane of the shaft
4|. Each rotor comprises a tubular shaft 41
having detachably secured thereon several rows
trailer I5. At one end of the frame is mounted
a power unit l6, preferably of the type including
of resilient hooked tines or teeth 48, the teeth
an internal combustion engine, which transmits 50 being hooked in the direction of rotation, and
power through a horizontal drive shaft H ex
the teeth at the underside of the rotors moving
tending longitudinally of the frame. The shaft
in the same direction as the upper run of the
conveyer. A spool-shaped bushing 49, Fig. 3, is
IT is enclosed in a tubular member [8 having a
gear housing [9 at the end distant from the power
pressed and welded into an end of the tubular
unit, thelother end of the tubular member being 55 shaft vll‘! and is rigidly carried. on an aligned
carried by a suitable wheeled vehicle such as a
shaft 50. The shaft 50 of each rotor is journalled
in self-aligning anti-friction bearings 5| secured
to the opposite parallel bars 52 of a tiltably
mounted rectangular bearing frame or support
shafts 83 at both ends journalled in self-align
ing bearings 84 secured to thbe machine frame.
53, Figs. 3 and 4. The outer side bar of the
bearing frame 53 carries a pivot rod 54 extending
sprocket wheel 81 on the shaft 50 of the mixing
One of the rotor shafts 83 carries a sprocket Wheel
85 which is connected by a chain 86 to a similar
rotor 46.
transversely of the rotor shaft and parallel to
The shafts 50 of the ?rst and second stage
the frame stringers l3, the rod being journalled
mixing rotors 45 and 46 are each provided with
at opposite ends in spaced pillars 55 upstanding
a sprocket wheel 88 arranged close to the ver
from the stringer 13. ‘The normal horizontal 10 tical plane of the pivot rods 54 for the tiltable
position of the rotor is determined by a post 56,
rotor mountings and disposed in the vertical
Fig. 3, upstanding from the stringer l2, the post
‘plane of the sprocket wheels 24 and 44. An end
56 having an adjustable jack screw 5? on which, ‘ less driving chain 39, Fig. 1, is trained over the
the rectangular bearing frame normally rests.
sprocket wheels 24, 44 and 33, thereby driving
The two mixing rotors >45 and ‘436 are enclosed 15 the conveyer and also the ?rst and second stage
by an elongated inclined hood-forming casing
mixing rotors. The chain 89 has a reentrant
58 which extends above the upper run of the‘
portion extending over the sprocket wheel 44,
conveyer and is supported by the frame stringers
thus increasing the arc of chain engagement on
II and i2. At its lower end the casing 58 forms
the sprocket wheel 88 of the second stage mix
a hopper 59 for the road material to be mixed,
ing rotor £16. The tension of the driving chain
the side of the hopper adjacent to the rotor 45
'89 is adjusted by raising or lowering the pivot
being formed by an inclined ?at gate Eli which
ally mounted gear housing iii. The ?nal mixing
is slidable in the casing to adjust the thickness
rotor 82 is driven by the chain 86 from the shaft
of the bed of material moving upwardly along the
of the second stage mixing rotor.
conveyer. The adjustment of the gate is effected
In operation, loose road material or aggregate,
by a rack-and-pinion connection iii, Fig. 8, the
such as crushed stone, gravel, or sand, or mix
pinion shaft having a handwheel 62, Fig. 3, ac
tures thereof, is placed in- the hopper 59. From
cessible at the side of the casing 58 supported by
the hopper the material passes upwardly along
the stringer I l.
the inclined upper run of the conveyor 28, the
The lower edges of the side walls of the casing
depth of the bed of material being regulated by
58 have outturned longitudinal ?anges 83, Fig. 3,
the gate GB. The conveyer is driven at a suitable
extending above and along the opposite side por
low rate of speed by the reduction gearing com
tions of the upper run of the conveyor. The cas
prising the large sprocketwheel 44 at one end of
ing side wall adjacent to the stringer l 2 is slotted
the shaft 4!, and the chain drive at the other
to receive the rotor shafts 53, the slotted por 35 end of this shaft. As the material on the con
tions being closed by detachable slotted cover
veyer reaches the zone of action of the rotor 45,
plates 64. The other casing side wall is provided
it is coated with the liquid bituminous binder
with rectangular openings 55 for access to the
sprayed onto the material from the pipe 68 and
rotors’ these openings being normally closed by
is mixed and pulverized by the rotor, the ma
removable panels 66 which are adjacent to the
terial being thrown about by the rotor teeth
free ends of the rotors. A transverse balile plate
against the walls of the rotor chamber and be
61, Fig. 2, extends between the side walls of the
ing in suspension during the application of the
casing 58 at a region about midway between the
binder. In a similar manner, the material is furmixing rotors 155 and 46. Extending transversely ‘ ther mixed and bituminated by the second stage
in the casing near the upper portion thereof are
: rotor 46, and thereafter drops over the upper end
spray pipes 58, 69, and “i9 adapted for pressure
of the conveyer into the mixing chamber 75,
where it is given a ?nal thorough mixing action
by the rotor 82. Practically all of the material
passing into the chamber 15 falls into the path
'1 of the rotor teeth. The thoroughly mixed bitu
spraying a suitable liquid binder, such as bitu
minous oil, onto the material being mixed. The
spray pipe 58 is disposed in the casing chamber
having the rotor 135, and the spray pipes 69 and
10 are in the chamber having’ the rotor 46.
Some or all of the spray pipes are provided with
shield plates ‘H. The spray pipes are connected
to a supply header 12, extending along one side
of the casing 58, each spray pipe having a valve
13, Figs. 1 and 3. The casing 58 has a vertical
end wall 14 spaced from the discharge end of the
conveyer to permit the downward passage of the
minated material is gradually discharged through
the passage 80 as indicated by the arrow in Fig. 2.
The ?nished material may fall directly onto a road
bed or into vehicles for further transport.
The ?rst and second stage mixing rotors are
each tiltably mounted and are capable of yield
ing upwardly when encountering excessive re
sistance, as indicated by broken lines in Fig. 3,
thus avoiding damage to the mechanism by hard
The mixed material moving over the upper end 60 lumps or foreign objects in the material or by
of the conveyer drops into a mixing chamber '15,
excessively heavy feeding. At the lower portions
Figs, 2 and 3, constituting an extension of the
of‘ their travel, the outer ends or tips of the teeth
casing ‘58, the chamber 75 having a concave bot
of the rotors 45 and 46 are normally spaced a
tom wall l6 and an angular cover member I'l
short distance above the upper run of the belt
forming a top wall 18 and a side wall 79 and
conveyer, and this spacing can be readily ad
presenting a downwardly opening discharge pas
justed by the jack screws 5i, so as to position the
sage 85 between the outer edge of the concave
rotors during assembly and to compensate for
bottom wall and the lower edge of the side wall
subsequent wear on the rotor teeth.
79. The cover member 1'! is pivoted at 8! for
The modi?ed form of mixing machine shown
access to the chamber '55. A mixing rotor 82
in Figs. 5 to 7 includes a suitably driven ?nal mix
extends horizontally in the chamber 15 in parallel
ing rotor I82 similar to the rotor 82 of the ma
relation to the other mixing rotors, the axis of
the rotor 82 being below the level of the con~
veyer shaft 33. The rotor 82. is generally similar
to rotors 45 and 46 except that it has aligned 75
chine of Figs. 1 to 4 but having its horizontal axis
arranged transversely of the axes of the first and
second stage rotors. In the modi?ed machine,
the frame Hi} supports a rotor casing I58 the
front end wall [14 of which extends downward
to form the end wall of a mixing chamber I15
for the rotor 182. The side walls of the casing
I58 have portions which slope and converge down
wardly to form walls of the chamber I15, as seen
for carrying the material therealong, a mixing
rotor disposed transversely over said conveyer run
for operating on the material, a casing extending
in Fig. 6, one of these walls merging into a con
cave bottom wall H6 of the chamber. The mix
extending transversely of the rotor axis to permit
upward tilting of said rotor when encountering
ing chamber also has an angular cover member
IT! similar to the cover member 11 of the ma
excessive resistance to rotation, and means for
driving said rotor including a sprocket wheel on
chine of Figs. 1 to 4, and forming with an edge
of the concave bottom wall a downwardly di
rected discharge passage 180. The mixing rotor
£82 has shaft extensions I83 journalled in bear
ings I84 on the frame H0, one of the shaft ex
tensions having a sprocket wheel I855.
The ?nal mixing rotor is so located that the
stream of material dropping from the conveyer
will be more or less centered with respect to
over said rotor, means for supporting said rotor
from one end thereof and having a pivotal axis
said rotor adjacent to the vertical plane of the
axis of tilt.
2. In a mixing machine, the combination of an
endless belt conveyer having an upper run for
supporting thereon loose material to be mixed
and for carrying the material therealong, a power
driven mixing rotor disposed transversely over
said conveyer run for operating on the material,
a casing extending over said rotor and having
the length of the rotor, and a large part of the
opposite side walls with edge portions adjacent
material will fall into the path of the rotor teeth. 20 to said run, means for supporting and driving said
In passing from the upper end of the conveyer to
rotor at one end thereof, the side wall of said
the ?nal mixing rotor the material will have a
casing adjacent to the free end of said rotor hav
crosswise component of travel which will tend to
ing an aperture for access to said rotor, and
improve the mixing action.
means for normally closing said aperture.
The side walls of the casing I58 are here shown
3. In a mixing machine, the combination of an
to be provided with de?ectors 19H adjacent to
endless belt conveyer having an upper run for
the upper run of the conveyer and in advance of
sup-porting thereon loose material to be mixed and
the ?rst and second stage mixing rotors 45 and
for carrying the material therealong, a power
46, so as to urge the bed of material on the con
driven mixing rotor disposed transversely over
veyer away from these side walls and into the 30 said conveyer run for operating on the material,
path of the mixing teeth on the rotors.
a casing extending over said rotor, a support at
The machine of Figs. 5 to 7 is otherwise sim
one end of said rotor having axially spaced bear
ilar to that of Figs. 1 to 4 and operates in substan
ings for carrying said rotor, means for tiltably
tially the same manner.
mounting said support to permit upward dis
What I claim as new and desire to secure by 35 placement of said rotor when encountering exces
Letters Patent is:
1. In a mixing machine, the combination of an
endless belt conveyer having an upper run for
supporting thereon loose material to be mixed and
sive resistance to rotation, and stop means for
determining the normal position of said tiltable
rotor-carrying support.
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