Oct. 22, 1946. . H_J_SEAMA‘N " _ 2,409,646 MIXING MACHINE Filed May 26,, 1945 FIG. 1 - ‘ > .5 Sheets-‘Sheet l 6088 72 .50 ~58 _ l 6O 73 A‘ " 53 74 ' J5 J - 13 81 _ _ Jingle“? : ¥ ' INVENTOR \j a } ?ag, ,OM .14- 22‘ Z3’ Z6 ATTORNEY Oct. 22, 1946. > H. J. SEAMAN ' . MIXING MACHINE - 2,409,646 . v Filed May 26, 1945 s Sheets-Sheet 42 . 6-9 72 75 51 5’ 5% “ 66 87 51 ' A .54 5.5 .39 .13 29 50 .57 .58 44 41 42 INVENTOR HARRYJ. SEA AN ATTORNEY 2,409,646 Patented Oct. 22, 1946 UNITED STATE 5 PATENT OFFICE . 2,409,646 MIXING MACHINE HarryjJ. Seaman, Milwaukee, Wis. " Application May 26, 1943, Serial No. 488,539 3 Claims. (Cl. 259-6) 2 1 ‘ 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 vention; Fig. 2 is a longitudinal sectional elevation of the machine; ' 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 2,409,646 3 4 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 material. ' ‘ 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 2,409,646 5 6 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. HARRY J. SEAMAN.