US1755653A - Subgrade preparing, concrete distributing, and finishing machine - Google Patents

Description

April 22, 1930. P. A. KCEHRINGU 1,755,653

SUBG'RADE PREPARING, CONCRETE DISTRIBUTING, AND FINISHING MACHINE Filed July 21, 1928 3 Sheets-Sheet l Tia- 1 April 22, 1930.- P. A. KOEHRING SUBGRADE PREPARING, CONCRETE DISTRIBUTING, AND FINISHING MACHINE Filed July 21. 1928 s Sheets-Sheet 2 April 22, 1930. P. A. KOEHRING 1,755,653

SUBQRADE PREPARING, CONCRETE DISTRIBUTING, AND FINISHING MACHINE 1 Filed July 21, 1928 s Sheets-Sheet 3 Patented Apr. 22. 1930- UNITED STATES PATENT OFFICE PHILIP A. KOEHRING, OI? MILWAUKEE, WISCONSIN, ASSIGNOR TO KOEHRING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION SUBGRADE PREPARING, CONCRETE DISTRIBUTING, AND FINISHING MACHINE Application-filed m 21, 1928. serial No. 294,553..

The art of roadbuilding is today receiving a large amount of attention from engineers and inventors who-are making improvements following the trend of simplifying to as great extent as possible the methods of construction of concrete roads, and this invention is directed to the above end. The conventiona1 practice today is to avail of a machine for finishing or leveling the subgrade prior to 10 the depositing of concrete thereon, another machine is employed for mixing and depositing the concrete on the surface, and still further instrumentalities are brought into operation for finishing the concrete road. The universal custom is to have these machines operate separately and independently of one another." It is an object of thisinvention to provide road building machinery of the class noted, in which the mixing plant, subgrade finishing means, concrete spreading instrumentalities, and road finishing devices are all combined and moved as a unit along the subgrade in the construction of the road.

Inasmuch as the modern type of pavlng machine is of such construction that one end thereof must be accessible from trucks and other carriers employed to charge the'loading ski-p thereof, it is an essential in a combined unitary assemblage, such as above described, that the subgrade preparing means follow the mixing lant in its movement along the subgrade; ut it is just as much an essential that these preparing or, leveling means operate on the subgrade prior to the In order to meet these conditions, I avail of concrete spreading instrumentalities, which are somewhat removed from the mixing plant, together with suitable devices for con- 40 veying the mixed concrete to the spreading v instrumentalities. Interposed between these spreading instrumentalities and the mixing plant, are the subgrade finishing means, which may comprise the usual scarifiers and scrapers or screeds. In the rear of the concrete spreadin instrumentalities, I position the road finishing devices, which in this instance may comprise a properly shaped roller, together with its operating instrumentahties.

An assemblage of this type particularly depositing of the mixed aggregates thereon. p

adapts itself to the utilizing of its forward I movement for the spreading of the concrete, and for this reason, as well as others, such as the simplicity and ease of operation, I avail of a transverse hopper construction as the concrete spreading instrumentality. Generally speaking, this ho per comprises a large receptacle having a wi e top and a comparatively restricted opening in the bottom thereof through which the concrete passes in being deposited on the road bed. Suitable traction mounting for the hopper is necessarily provided. Inasmuch as this hopper is spacedfrom the mixing plant, as hereinbefore noted, an essential feature of the invention lies in the means for carrying concrete from the mixing drum to the distributing hopper.

In devising .a practical construction for carrying out this object, I'employ a telescoping chute which has one'end aflixed in a guide way running along the hopper, while its other end is pivotally supported beneath the discharge chute of the mixing drum. Suitable operating instrumentalities are provided in the construction of the mixer for causing oscillation of this telescopic conveying chute. The reason for this oscillation is that proper functioning in discharging a hopper of this character is dependent on the even distribution of concrete throughout the'length there- 'of, and it is a particular object of this invention to provide suitable means for so depositing the prepared concrete therein and to thisend the oscillating chute above noted has been rovided. s5

Particular features of the invention reside in the. pivotal mounting of the conveying chute together with the operating instru-' mentalities for causing the oscillation thereof, also in the mounting of'the end of the chute in the guide way along the hopper.-

Proper operation of the road finishing devices of the type employed in this'instance, namely, the roller, entails the revolution thereof at a speed faster than that which would naturally be engendered by rolling movement of the roller along the road. It is therefore an object to rovide suitable instrumentalities for rotating this rollerat the relative speed indicated. In carrying out 103 this thought, the roller is freely mounted on wheels which move along the customary road rails. and has keyed thereto a sprocket which is driven by a chain that passes over a some-. what larger sprocket carried by a wheel also driven along the road rail. and which wheel is substantially of the same dimensions as the wheel in which the finishing roller is mounted.

A- detail object in view is to arrange the finishing roller so that it also functions as a wiper for the discharge opening of the distributing hopper, and this is achieved by positioning this roller directly behind the distributing hopper so that the face thereof substantially wipes therear of the hopper. In this manner the collection of any aggregates around the edge of the discharge opening is inhibited. A highly important object of the invention is to provide subgrade finishing means, concrete spreading instrumentalities, and road finishing devices of the character hereinbefore described, which maybe readily 'adap'ted and used in conjunction with. the

type of road paver now commonly in present In this connection, it is noted that vogue.

all of these devices may readily be applied to modern road pavers with slight alteration to the latter. Practically speaking, they might be substituted for the ordinary boom and bucket constructions.

With these and otherobjects in view, as

, will in part become apparent, and in part be hereinafter stated, the invention comprises certain novel constructlons, arrangements and combinations of parts, as will be subsequently specified and claimed.

For a full and more complete understand-' ing of the invention, reference may be had shown instrumentalities,

road finishing roller.

to the following description and accompanying drawi-ngs, in which igure 1 is an end view of a'mixlng plant with the attachments provided by this invention applied thereto, the mixing plant being ragmentarily. Figure 2 is'a plan view of the distributing 110 per together with the finishing roller.

. Flgure 3 is a section taken about on the line 33 of Figure 2, bringing out the construction and mode of operation of the concrete spreading instrumentalities as well as the Figure 4 is a detail illustration in Section of one end of the finishing roller together with the instrumcntalitics for oscillating said conveying chute.

Figure-8 is a showing, somewhat diagrammatic of a modified form of the road finishing roller.

While a preferred specific embodiment of the invention is herein set forth, it is to be understood I am not to be limited to the exaet constructions, illustrated and described, because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claims.

A mixing plant such as heretofore usedwith paving machines of the type shown by my Patent Reissue No. 13,617, issued September 16th, 1913, is indicated generally by the reference character A, and includes traction devices B, and a discharge chute C for the mixing drum, also a constantly driven shaft designated 1. This shaft 1 is driven from the power source of the mixer, (not shown). It is readily appreciable that the various devices provided and assembled by this invention are particularly adapted for use with a known type of mixing plant.

The subgrade finishing means is referred to generally by the reference character D and may include scarifying teeth shown at 2, and a screed or blade indicated at 3, and which members are properly included in the construction of a framework which moves along road rails designated E, on account of being supported by small wheels or rollers 4:. The subgrade finishing means D is-connected to the mixer A by suitable draw bar construction, such as indicated at 5, and is positioned directly in the rear of the mixer.

The concrete spreading instrumentalities,

together with road finishing means, are denoted generally by the reference character F. They comprise a hopper-6, having a comparatively wide top and narrow bottom, in which is the discharge opening or slot 7. This hop- 1 per is supported at each end by side frame or bracket members 8, which are fastened to the hopper in any suitable manner suchas by rivets, and which side members 8 include longitudinally extending portions 9, which carry at each end smallw-heels or rollers 10 that run along road rails E. The concrete spreadmg lnstrumentalities F are connected with the mixer by a draw bar arrangement indicated at 11 which, through the subgrade finishing means D disposes the mixer, subgrade finishing means, and'concrete spreading 'instrumentalities in a unitary relation so that they move together along thesubgrade.

road finishing roller 12, whichpreferably is of smaller diameter at its center than at itsextremities is keyed to a shaft 13 as shown at 14'. This shaft is freely mounted at each end in the wheels 10, and has keyed to its outer end a sprocket 15 of comparatively small diameter. The wheels 10, which are removed from those'wheels 1 in which the shaft and due to the difference in dimension ofthe sprockets 15 and 16, the roller 12will be rotated at a peripheral speed greater than that which would ordinarily be entailed by rolling movement -over the concrete.

his action causes a nicety in the finishing operations made b the roller upon the concrete road. Attention is directedto Figure 3 wherein the roller isshown as positioned very close to the hopper 6 so that it func-.

. tions as a wiper for the rear of the discharge .opening thereof, preventing any accumulation of concrete thereabout.

The discharging hopper 6 receives ncrete from the discharge chute C of the m xer A through the medium of a conveying c ute G comprising telescopic sections 18 and 19. The

section 18 is in effect a distributing pan whichis pivotally mounted on brackets 20, which .aresecured to the framework of the mixer A.

The under side of the distributing pan 18 is provided with a-circular gear 21 with which mesh pinions 22, carried by a shaft 23, which has proper mounting in the brackets 20.

Clutch members 24 are slidably mounted on the shaft 23 and are adapted to move into clutching engagement with the pinions 22 so as to clutch either one of these pinions to the shaft. Arms 25 are attached to the mein bers 24 and have at their ends projections 26, which are adapted to be engaged by the fingers of a" clutch throwover arm 27, which is rotated coincident with rotation of the pan 18. A spring 28 has one end fastened to the throwover device 27 and its other end is made fast to the bottom of the pan so that it holds the clutch members in either of their positions. The device 27 is integral with an arm 27 mounted on the lower face of the member 18. The shaft 23 has at one end a bevelled gear 29 which is.in engagement with a complemental bevelled gear 30, that is driven by a chain 31, passing over a pinion 32 operative integral with pivotal gear 30, and a second pinion 33 keyed to the constantly rotating shaft 1.

'The operation of the foregoing construction for the oscillation of the chute is thought to be obvious. Briefly summing up, driving of the circular gear 21 by one of the pinions 22 causes rotation in one direction. while driving of the gear by the other pinioncauses rotation in the opposite direction. The clutch arrangement is such that only one of these gears is operatively connected with the shaft 23 at the same-time, and first one and then the other is brought into operation by the clutch shifting devices comprising parts 25, 26, '27. 27 a and 28, which are operated by the rotation of the pan. It will swing in one direction to a certain extent, w-liereu on the clutch is shifted so that it swings ack 1n the opposite direction, whereupon the clutch is again shifted. In this manner the chute is constantly oscillated. v

Thesection 19 of the chute has an end member 34 telescopically connected thereto, and

disposition of the chute end in the middle .of.

the hopper regardless of the angular relation of the distributing chute with respect to the hopper 6. In one position the chute will be elongated, while in another it will be contracted. I i

The mixing plant A discharges prepared concrete through the discharge chute C onto the conveying chute G, which member evenly deposits the mixed concrete in the hopper 6 from oncend to the other. This hopper 6 extends transversely across the entire width of the road, and coincident with forward movement of the entire assemblage, spreads the concrete through the opening 7 onto the subgrade which has been properly prepared for the reception of aggregates by the subgrade finishing means D. The roller 12 finishes the road by its rotation due to its driving means. Any irregularities or unevenness are accommodated by the telescopic chute G.

The roller 12 may be of sectional con-- struction as indicated in Figure 8. This construction facilitates the handling of the the various sections are interlocked together by detachable connections.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent ofthe United States is 1. In road building apparatus of the class described, the combination with ;.a mixing plant, of instrumentalities for depositing and spreading concrete on a subgrade, and

means for finishing the surface of .the subade and interposed between the mixing plant and the spreading instrunientalities,

said instrumentalities and means being simultaneously operable to perform their respective functions. while continuously moving along the roadbed.

,2. In road building machinery of the class described, the combination with ai'mixer, of subgrade finishing means. connections be tween said subgrade finishing means and the mixer, concrete spreading instrumentalities connected to the subg'radefinishing means,

and a road finishing device associated with mentalities and the mixing plant, and means vfor conveying concrete from the mixing plantto thespreading instrumentalities, said last named means extendmgover the subgrade finishing meansand comprlsmg an extensible chute.

5. Road building machinery of the class described, comprising in combination, a portable mixing plant, a distributing hopper adapted to extend transversely across a road to be built. subgrade finishing means inter posed between the discharging hopper and the mixing'plant. and means for conveying prepared concrete from the mixing plant to the discharging hopper, said means also functioning to distribute the concrete evenly throughout the distributing hopper.

6. Road building machinery of the class described, comprising. in combination, a portable mixing plant, concrete spreading instrumentalities, an oscillating chute for conveying prepared concrete from the mixing plant to the spreading instrumentalities', and means for automatically oscillating said .=chute. v

7 Road buildin apparatus of the class described, comprising, in combination, subgrade finishing means, concrete spreading instrumentahtles, a road finlshlng roller, and

means for connecting the spreading instrumentalities with the subgrade finishing V means.-said roller being associated with the tributing hopper adapted to extend trans-" spreading instrumentalities and functioning as a wiper thereforj 8. Itoad'building machinery of the class described, comprising, 1n combination, a dis versely across a road, said hopper having a discharge opening at thebott'om thereof, and

a finishing roller associated with the hopper andpositioned so that it functions as a wlper for one side of the discharge opening.

9. Roadbuilding machinery of the class described, comprising, in combination, a portable mixing plant, a. distributing .hopper 'portably mounted and connected with the mixing plant, means for conveyigg concrete from the mixing plant to' the: hopper, said hopper having a discharge opening at the 'bottomthereof for permitting concrete to .pass onto the surface of a subgrade, afinishing roller positioned adjacent to one side of the discharge opening, and means for rotating the finishing roller at a speed greater than that at which-it would ordinarily rotate due to rolling movement.

10. Apparatus of the class described, comprising, in combination, aportable mixing plant, spreading instrumentalities, an oscillating conveyor chute for conveymg concrete'from the mixing plant to the spreading instrumentalities, and gear and clutch mechanisms for causing automatic oscillation of the chute.

11. In road building machinery of the class described, the combination, with a mixer, of

a conveying chute having one end pivotally mounted on the mixer beneath the discharge chute of the latter, a ring gear on said conveyor chute, pinions included in the construction of the paver and in engagement with the ring gear, one of said pinions being adapted to swing the chute in one direction,

the other pinion being adapted to swing the chute in the o posite direction. and clutch means for clutc ing either one of the pinions to a driving means.

12. In road building machinery of the class described, the combination with a portable mixing plant, of a distributing hopper spaced therefrom, and a telescopic conveying chute for conveying concrete from the mixing plant to the distributing hopper and pivotally mounted in the mixing plant.

13. In concrete road building apparatus of the class described. the combination with a mixer havinga discharge chute, of a distributing hopper for spreading concrete aggregates on a subgrade surface, a telescopic conveying chute for conveying concrete from the discharge chute to the distributing hopper, means connecting one' end of the discharging chute with the'distributing hopper by permitting a' movement of the end of the chute along the hopper and a pivotal mounting for the other end of the chute on the mixer.

14. Road building apparatus of the class described, comprising, in combination, subgrade finishing means, concrete spreading instrumentalities, a road finishing roller, and means for connecting the spreading instrumentalities with the subgrade finishing means, saidroller beingof sectional construction to facilitate its handling.

15. Road building machineryof the class ,ins trumentalities extending across a width of the road for distributingand spreading concrete thereon, and means for conveying concrete the mixing plant to the spreading instrumentalities, said conveying means being extensible permitting the same to deposit prepared concrete at any point along the len th of the spreading instrumentalities.

16. bad building apparatus of the class described, comprising, in combination, a' portable mixing plant, a distributing and spreading hopper extending transversely across the road which is being constructed, 10 said hopper being removed from th, mixing plant, and extensible means between the mixing plant and hopper for conveying concrete from the former to the latter, said means being adapted to deliver concrete at any point 15 along the ho per.

17. Road uilding apparatus of the class described, -compris1ng, in combination, a portable mixing plant, a distributing and spreading hopper extending transversel across the road which is being constructe

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