US2374025A - Pavement finishing machine - Google Patents

Description

April 17, 1945( E. H. I IcHTr-:NBERG 2,374,025

PAVEMENT FINISHING MACHINE Filed March 16, 1942 4 Sheets-#Shee't 1 April 17, 1945 K E. H. LICHTENBERG 2,374,025

PAVEMENT FINISHING MACHINE Awww/H01,

April 17, 1945. E H. |C||TENBERG 2,374,025

PAVEMENT FINI SHING MACHINE Filed March ie, 1942 4 sheets-sheet s April 17, 1945. E. H.V| |CHTENBRG 2,374,025

PAVEMENT FINISHING MACHINE Filed March 16, 1942 4 Sheets-Sheet 4,

33 v 4 l v Eg i :I j q q L 3 5l. :/|\5 *l Il L s H :a 5/ 3/ i /a 7 Igll 2.7 L Il L I i 1[/7' li?? 'I I l il' e I zf 1 l y 1| I q Patented Apr.' 17,' 1945 PAVEMENT FINISHING MACHINE Erich H. Lichtenberg, Milwaukee, Wis., assignor to Koehring Company poration Milwaukee, Wis., a cor- Application March is, 1942',l serial No. 434,963

(cwi- 46X is claims.

The present invention appertains to the art .of finishing machines of the type designed for finishing concrete aggregates deposited uponv a subgrade of a road pavement, or the like.

It is customary rfor machines of the type, above generally referred to, to be supported at In lcertain types of nishinggmachines utiliz--A ing spreading mechanism for the purposes of this invention, the spreading means operates transversely of the roadway or subgrade being paved, and being driven by suitable ,power means, transverse forces, which are communicated to the spreading means, are transmitted tothe road forms upon which the machineis mounted, tending to throw these forms out of alignment, and loosen them,V in a disadvantageous manner for obvious reasons. y

One of the primary objects of the present -invention, therefore, has been to provide an endvibrating means `is designed for operating the screed. in .a direction generally longitudinally of "the road subgrade, as distinguished from the action of the spreading means transversely to said/subgrade.

In addition/co the longitudinal movement of the screed', above referred to, the actuating means causesv the samev to exert pressure forces downwardly and .forwardly at an angle to the horizontal plane of the lsurface of the aggregates being emplaced on the-subgrade. The action of the screed, as above described, affords a compacting-.of the road aggregates in a peculiar mannerx not heretofore achieved by previous types of means of this sort.

Generally speaking, a main object of my in- .vention is.to Aprovide a machine comprising a knovel spreading unit and a novel screed unit,

the same assembled upon a main supporting frame for the. machine rand operable preferably from the same power. plant.

Another object of this invention isto provide a novel arrangement of spreading instrumentalities associated with the spreading unit, novel drive means for the same and a novel arrangement of theyparts involved in the device above' mentioned..

less .belt vor chain type of spreading mechanism inwhch the spreading devices are carried by oppositely. moving sections or portions of the beltor chain means, which portions move in op'- posite directions transversely of thesubgrade so as to neutralize the forces Set up'in their spreading action and prevent undue transverse stresses from being thereby communicated tothe frame of the machine, and to the frame and supporting wheels and road forms.

Aiurtherobject of this invention is to provide a novel arrangement of normally spaced spreading devices and disposition thereof with .respect tormoving means therefor, such as to permit a certain amount of the material being spread to flow between and past the spreading devices` and to be nished oi by any suitable auxiliary means adjacent thereto. v

stm another object of the inventionfresidesm the provision of peculiar means forvibrating or' actuating thenishing screed provided as a part of the screed unit' of the design of my machine of my improved finishing machine. The said A still further object of this invention is to provide a novel form of strike-oft plate in which the members are individually adjustable to providethe crown contour for a road, `or the like, and a further object of this invention is to provide a screed inwhich the vibratory action is a reciprocatory action in a substantially angular relationship with respect to the surface `of .the screed which contacts the'concrete being iinished. v

Further'and more particular objects of this inventionA will be .set forth in the accompanying specification and claims, and referred to in the drawings, inconjunction with a description of the parts making up the machine shown in the drawings. Inzthe drawings: v

.Figure 1 is a sideview of a machine of the character described, showing the arrangement ofthe spreading and nishing units in conjunction with a frame for supporting the same and I Figure 2 is a view taken about on the liner-2- of Figure 1, looking inthe direction of thearrows which illustrates the'arrangementof the 'generally the adjusting means for the finishing unit andthe individual adjusting meansifor the screed members, as well as the vibrating instrumentality associated with said members, the screed being raised from the road surface.

being denoted 2, and the transverse member indicated in the Figure 7 being denoted 3, suitable vertical frame members Il supported on the frame members 2 and 3 in a conventional manner, and being connected thereto by welding or other suitable means, the said upright members 4 having connected at their upper ends longitudinal channels or beams and a transverse beam 6 at the junction of the longitudinal beams 5 and the upright members 4. Spaced rearwardly of the I front upright members t and completely within Figure 3A is a View taken about onthe :line

3A-3A of Figure 3, looking inthe ,direction of.

the arrows, and illustrating ',c'ert'ain 'particular features of the vibrating means.`

Figure 3B is a sectional view Awith portions oi the same broken away, illustrating certain guide means for the weight means and taken about on the line 3B-3B of Figure 3.

Figure 4 is a fragmentary view taken about on the line 4-4 of Figure 3, illustrating the sectional strike-off plate and rcertain adjusting means for the finishing unit. c

Figure 5 is a sectional view, portions being broken away, taken about on the rline 5-5 of Figure 3, and illustrating the adjusting instrumentalities for the screed and the relationship of the vibrating means to the same.

Figure 6 is a top view of the machine. illustrated in Figure l, generally diagrammatic in its showing, and illustrating primarily the driving instrumentalities for the respective-spreading units and finishing units and the vcongura- Y tion of the spreading unit. l

Figure 7 is a sectional view taken about on the line 'I-l of Figure 6, and illustrating the novel spreading instrumentalities of thev spreading unit and certain adjusting'meanstherefon Figure 8 is a fragmentary view with certain parts in section, of certain-of lthe instrumentalities of the spreading unit clearly s illustrating certain novel features therein.

Figure 9 is a fragmentary view taken about on the line 9-9 of Figure 8, looking in the direction of the arrows, and illustrating certain vdetails of the spreading unit and the relationship of those details with -one another.

Figure l0 is a sectional view taken about on the line Ill- I0 of Figure 9, looking in the direction of the arrows, with. certain lportions of the machine'broken away,y the said view illustrating certain of the spreading devices and the drive means therefor, in conjunction with guide means provided.

Referring generally to Figure 1, the machine to be described in this disclosure is shown as being comprised of a main frame A supported on asubgrade by means of theforms generally indicated B by conventionalflanged wheels I adapted to roll over theforms and be guided thereby, thesaid main frame A having supported `therein the spreading unit C adjacent the front vof the frame A and rearwardly of the said spreading unit a finishing unit D, the said spreading unit, finishing unit and machine being propelled and the various units actuated by means of a power plant E located substantially rabove the previously rmentioned finishing unit D..

vReferring more particularly to Figure 6, wherein is shown the 4spreading .unit C, previously mentioned, the main frame A is shown as having girder members or channel. members forming a substantially rectangular lower frame 7 portion, the `longitudinal members of the frame tional manner.

the main frame A is the sub-frame, generally denoted F, the same being a part of the spreading unit now to be particularly described in reference to Figure 7.

The subframe F is shown as having vertical channel members 1, suitably spaced within said main frame, and adapted to be fixed at the lowe.` ends thereof to frame members 8, which may generally be channel members similar to the upright members 1, and the said frame members 8 and upright members are rigidly braced by means ofncross braces 9 and I il, whereby a sub-frame F may generally be provided as a sort of depending frame from additional transverse girders or channels I0 suitably fastened at their ends to the longitudinal upper frame membersl 5, previously referred to in relation to Figure 1.

At this point reference is made to Figures 8 and 9 to indicate the structure of the sub-frame in somewhat more clear detail, the said frame members 8 being shown in these figures as having engaged at their outer ends bearing portions I2.

Referring back again to Figure 7, it will be seen that the frame members 8 are provided in pairs, whereby aligned bearings I2 are provided. The vsub-frame F is formed in the manner above described in order to provide a framework for supporting endless chain means i3 thereon, by `means of suitable sprockets I4, the said sprockets including bearing portions l5 adapted to rotate in lthe bearing members I2 amxed to the frame members 8, the said sprocket members I4 adiacent the upper and lower frame members 8 and at opposite ends being drivably interconnected by means of the chains I3, and the said respective upper and lower sprockets at each end of the frame F in turn being interconnected by means of shafts I6, the shaft Iii at one end of the spreader frame or sub-frame F, extending substantially above the transverse channel member Il) and being suitably carried in a bearing portion of a longitudinal bracing member I1, reference being here made at this point to Figures 6 and 7, the said shaft -i' having nxed at the outer'end thereof a suitable pulley I8 yadapted to be driven in a manner to be described.

Referring again to Figures k8 and 9, it should be mentioned that the sprockets I4, adjacent the ends of the upper and lower frame members 8, are adapted to coact with the chain members I3 in a manner that is apparent to those skilled in the art, whereby, when driving force is transmitted to the said sprockets, the chains will be carried around the sub-frame F in a conven- The said chains i3, both the upper and lower chains, are rotated lby the .sprocket members I4 about'the frame F in timed .ends ofthe shafts 20.

the paddle members I9 suitably xed' at the lower The said shafts 20 arev Figure 9 shows that only certain of the vsaid pivotal connections of the chains I3 are provided Vwith the pivotal bearing members 2I, the said `bearing members being hollow to provide a bearing portion for the shaft 20, as previously mentioned, the ends of the additional links oi?y the chain being connected together by generally conventional pivotal means 22,

Referring again'to Figure 10, it will-be seen that the paddle'shafts are provided at their upper ends with crank members 23 formed integrally with-said shafts, and at substantially right angles therewith, and at the outer ends of said crank members a further integral portion 24 is provided, adapted to carry guide rollers 25 thereon, adapted to coact with guide means 26 now to be described.

' The guide means'26 comprises a channel member of a formation generally following that of the chains I 3, and formed 4substantially as shown in lFigure with an up-turned lip 21 about its inner periphery, whereby the roller members 25 J may contact the same with rolling contact during the travel of the` chains I3 around the sprockets I4, carrying with them the shafts 20 upon whichvthe crank'arms 23 are provided, the said guide means 26 being adapted to be raised and lowered by suitable screw means 28 adapted to engage with ears or extensions 29 suitably fastened at the transverse extremities 'of said guiding channel 26. The said screw means 28 are carried in bearing portions 30 suitably `fixed to the longitudinal channel members 5, previously Vreferred to, collars 3| being provided on said screw means. The screw means 28 are provided at their upper ends with beveled gears 32 adapted to coact with corresponding beveled gears 33, suitably fastened on a transverse shaft 34, the

said transverse shaft being carried` by the longitudinal. upper frame members 5 in bearing porv'tions 35 fastened thereto, at its outer ends, and intermediate the said outer bearing portions 35 are additional bearing means 36 onl extensions of ,the upright sub-frame members 1.

`Adjacent one end of the transverse shaft 34, just referred to, a suitable crank36a is provided, whereby raising and lowering movementl may be imparted to the guide means or channel member 2li,A to thereby raise and lower the paddles or spreading devices I9. The raising and lowering of the spreading devices is effected b-y raising and lowering the shafts 20 tov which the lsame are connected, the said shafts 20 being slidable in the A bearing pivots 2| of the actuating chains I3, previously mentioned.

The paddle members I9, ladjacent the 1ower l ends of the shafts 20, are fixed to said shafts at,

Ations is to neutralizethe shifting tendency normally provided in spreading devices operating in one direction transversely of a subgrade,

It vwill be apparent that the spacing of the lpaddles I 9 permits the flow. of concrete aggregates therebetween while spread thereby, and then move past the same and directly to the oppositely moving paddles, whereby fthe latter will also spread part of the mix and overcome the tendency of the machine to shift in either direction incident to stresses set up by action of the paddles on the aggregates. This will facilitate a Arapid spreading, since asthe machine moves forwardly,

the paddles may be moved by the chains at an` increasedvspeed as compared with a construction wherebyonly the frontvlap and paddles moved thereby. are `used to accomplish the spreading action.

It is pointed out that the paddle members I9 are so actuated as `to spreadA certain portions of a mass of concrete deposited .on ar subgrade, transversely of said subgradewhereby pressure forces, exerted on the sub-frame and consequently on the main frame, are neutralized. The said pressure forces, normally being. transferred to the fianged machine supporting wheels I, and in turn, to the road forms B over which the supporting wheelsA I travel, it will .be seen that these pressure forces are neutralized, since the opposite laps of the chain I3 proceed in opposite directions and bear the paddle members or spreading devices I9 in opposite. directions..

The 'crank members 23, on the spreading device shafts' 20, are provided to maintain the angular relationship shown in Figure 9, of the respective spreading devices I9, during their travel as carried by the chains I3. It is, of course, apparent that these spreading devices I9 may be fixed to the shafts 20 in any desired angular relationship therewith,v to effect the spreading operation desired. The desirability of providing adjustable spreading devices is obvious, since, under many conditions, the depth to which the spreadingdevices are to penetrate into a mass of concrete being spread, thereby, must be different as the concrete is laid in increasing thickness upon the subgrade. It is likewise desirable to drive lthese adjusting means in a simple manner, and provide them of a simple form, and to carry thespreading devices and the chains and sprockets which drive the same on a rigid framework tomore .effectively accomplish the spreading of concrete,

or the like.

Referring now to the nishing unit D, previously mentioned in connection with the description of Figure 1, itwill be seen that vthe-said unit is located and supported on the main frame A rearwardly of the spreading unit C, just previously described. The finishingy unit D is supported on the main frame A in a manner whereby the same maybe adjustable vertically in accordance with necessary conditions, the said finish-v ing unit D comprising generally a rectangular upper` frame G, which includes longitudinal frame members 31 adjacent the longitudinal main frame members 5, and transverse frame members 38 integrally connected with the said longitudinalV frame members 31 at the ends thereof.

Reference at this ,point is made to Figure 3,

rwherein the transverse frame members 38 are shown as being provided with rearwardly and forwardly projecting members 39. A,screed,`gen `era'lly indicated H, is provided for the finishing unit D, the screed being madeup ofwsectional members 40, having hinge portions 4I 1 at. the

edges thereof, ythe vsaid hingeportionsfbeing cornmembers being formed 4substantially as .shown in Figure 3, with upwardly vextending edges 42 at the front and rear edges of the` said screed 'members 40, the said 11p-turnedv edges .42 in turn rigidly connected y thereto, inwardly extending flanges -43, adapted to beengaged by Supporting adjusting bolts 44. The said-adjusting bolts 44 are vertical members and are provided at their lower ends with threaded portions adapted to be engaged by nuts'45 having semi-circular faces.

Upon Iconsideration of Figure 5, it Vwill be noted that the semicircular faces of the nuts above and below the ange portions 33 are opposed, whereby arocking bearingconnection is provided, it being apparent that the flange portions 43 are furnished with suitably reamed out openings. to be engaged by the supporting rods 44 andnuts 45.

The upper ends of .the supporting rods 44 are similarly provided with semicircular nut members 45 adapted to be screwed onto threaded portions of the supporting rods and into engagement with the members 39, previously referred to, toprovide upper supporting bearing members. Between the upper nuts45 and .the upper surface of member 39. surmundng the rods 44, .coil springs 44a, are

furnished to facilitate the finishing action of the screed in a manner that will be understood as the description progresses. c

At this point, Figure `5 is referred to, to illustrate a certain adjusted position` of the interconnected screed members l40, by means of the supporting rods 44, just referred to, it being` well known that under many conditionsa crowned surface of a concrete road -is desirable, the same being possible of attainment by `a screed such as that illustrated in the said Figure v5.

The structure provided, heretofore described, is thus seen to be essentially an adjustable swingable structure, adapted to be reciprocated at a high rate `of speed, by means of a novel form of vibrating mechanism now to be described, and in a novel manner. While only one of these vibrating units is shown, it is apparent .that under certain conditions a plurality of the same may be provided affixed to the individual screed members to operate the screed. .Referring more particularly to Figure 3 again, it is .seen that a vibrating member, generally denoted J, is :comprised of a plate member 46 affixed at its lower edge to the upper surface of one of "the screed members 40, in a conventional manner, aiida rear plate member 41 similarly affixed to ysaid'screed member and substantially yparallel with the first named plate member.

An angularly inclined bottom member' 48 is provided suitably connected at its rear edgewith the rear plate member 41 vand at its forward or front edge to the upper' surface of the screed member 48, the said angularlyinclined member 48 providing a surface .over which a weight 4S, more clearly illustrated in'Figure 312i, is adapted to be reciprocated. i

rThe weight 49 is confined for travel movement between flanges 50 suitably xed to the inclined member 48 and including tongues 5i adapted to coact with corresponding grooves 52 of the said weight 48, wherebythe said weight may be moved in a manner to be described. rI'he weight 48 is provided with a transverse elongated slot 53 adapted to be engaged by the lower end of a'crank member 54a, the said crank member 54a 1being carried by an angularly inclined plate -55 parallel with the previously referred lto plate 48, the said plate 56 providinga bearing fora portion of said nected together by pins, the individual screedl crank member 54a, an additional bearing member being provided in a plate 56, whereby the `crank shaft 54 may be rotated in a manner to be described.

Adjacent the outer end of the crank Shaft 54 is provided a beveled gear-51 adapted to be rotated by means of another bevel geai 58, the bevel gear 58 being in turn supported by mea-ns of a drive shaft 59 engaged in bearing members .60 of the front and rear plate members 46 and 41, .the said drive shaft 59 carrying at its outer end apulley 6i, adapted to be rotated therewith by drive means to be Idescribed later. i

It will be seen that when the bevel gear 58 is rotated, similar motion will be transferred to the crank shaft 54, and the crank portion thereof, .engaged with the slot 53 in the` weight 49, will Icause the said weight to reciprocate angularly with respect to the screed member 4i), and impart thereto angular movement, whereby the said screed member 40 will be vibrated in a substantially to thus effectively accomplish the finishing of thel said road in a desirable manner.

The front transverse member 38 of the supporting frame G is provided adjacent .its lower portion with .a iiange 62 depending therefrom, adapted to' Support strike oi members `6.3 more particularly illustrated in Figure 4, whereby the said members 63 may be adjusted relative to the frame member 38 by means of suitable nut and bolt means 64 engaging elongated slot lpprtions 65 of said strike-off plate members 5 3. As will be readily understood, the strike-off, plate members generally provide a single strike-off plate `in effective action, which plate may be adjustably disposed with respect to the desired crown of a Aroad being finished by the machine under discussion. Since the crown formation of Various roadways may be desirably different, the reason for this adjustablefeature of the strike-off plate is readily apparent. Since the strike-off plate is supported on the frame G, it will 'be noted that the vertical adjustment of the said frame G -will carry with it the said strike-olf plate. The vertical adjustment is effected by means of screw members 'BE properly disposed with respect to the longitudinal frame members 31, adapted to contact with threaded portions therein, the said screw members 6B being in turn borne by projections 61, the said projections v(il being suitably fastened vto the vmain frame A in any conventional manner, the

` being fastened to the main frame A in `any conventional manner. In order .to move the adjustable frame G as a unit, the adjusting shafts .68 at each side of said frame are adapted to be operated by means of a chain 12 connecting the `said shafts E8 operatively, by means of gears fixed to said shafts. A suitable drive gear 13 is supported on a shaft 14 of bearings 15, the said bearings i 5 being carried by transverse frame members 1,6, kthe said gea-r I3 being driven by means of a belt 11, drivably connected with a pulley 18 operated: by the motor or power plant E, throughV a shaft'. 19. In order to transfer power for reciprocating:

Referring at this point to Figure 5, it will be `seen that this belt 82 drives a pulley 83 suitably xed to a vibrator drive shaft 84, the said vibrator drive shaft 84 being carried by.v bearing members 85a on the transverse members 38'of the adjustable frame G, previously referred to. The vibrator drive shaft 84 is provided with a pulley 85 adapted to operate a belt 86,'the said belt 86 being preferablya V-belt, which belt 86- is engaged with the pulley 6I of the vibrator'meche anism J, previously referred to.

To provide for the adjustment of the screed members 40 of the screed unit H, it is necessary to provide means for maintaining tightness of the belt 86 for driving the vibrating device J, and there is shown suitable belt tightening means generally indicated 81, of any conventional form, the said tightening means being seated adjacent the .upper ends of the supporting rods 44 of the screed members on a'projection of the member 39 engaged by said rods44.

It willthus be apparent that a suitable drive has been provided to actuate the vibrator unit J under all adjusted conditions of the screed H.A

The screed H may be in turn raised as a whole by means of the raising of the frame 'G supporting lthe said screen, through the instrumentalities previously referred to, namely, the screw mem' in an entirely new manner. Since previously the vibrating action has either been effected in a" manner parallel to the surface of the material being compacted, or in a vertical mannenthe vibrating action effected by the finishing unit, just described, will be seen to be a component of 'these two: actions, and as such, combines the desirable qualitieswhich each may have and eliminates certain undesirable reactions obtained in previous devices;

The main Aframe A may be driven or moved over the road forms on the wheels l, by suitable chain means 88, driven bysuitable gearing 89 operated by the motor E, the said gearing 89 effecting this operation by means of a transverse shaft 90, suit'- ably carried in bearing members 9i on the main frame A, the saidshaft 90 including gears 92 at its outerends for engagement with the chains 88, the chains 88 in turn being engaged with gears 93 suitably keyed to the Wheelsllpprting shaft 94, whereby the machine may be operated. j

It is understood that the drive for. the spread.-` ing unit C is .effected by means of a shaft 95 driven by the power'plant E, and the said shaft 95`is provided at its outer end. with ,a bevel vgear 98 adapted to coact with a bevel gear 91 on La shaft 98,.the said shaft 98.in turn having Ien-4 gaged near its lower end, a pulley 99. v.The pulley 9.9v isV adapted to operate .a belt lili), the said belt |08 in turn being carried by the pulley ,I8 ade jacent the upper end, ofthe drive shaft I of said spreading unit. l

It should be understood that lthe vibrating actionof. the screed is effectedlongitudinally of f. the -road1subgrade and'vof the materialbeing compacted, and-as such, is yatan angle to the spreading `action. effected by the spreading unit C, previously referred to, Awhereby the stability of the main frame A is maintained throughout lthe spreading andl finishing action. A notablefeature of the construction ofthe spreading unitis l the advantage derivedfrom being ableI to move portions of .a concrete mass intactwithout danger the mixture being' of separating the, ingredients of spread.,

Having thus described my invention, rwhat Ix' claim as new. and desire to secure by Letters .Pat` ent o f the United States, is:

1 A nnisningmacnine of tnelass described, in combination, a1 ymain frame, a spreader unitvk comprising transverse endless belt type spreader meansy including A spreading devices carried by 4 spacedv frontv and.y rear belt laps,V said belt means disposed "in aylplane ,above vthe spreading devices.. and the latterv being adaptedto spread a massof l. concrete. vdeposited on ,a Ysubgrade, supportingv means, for. theendlessbelt means providing 'an uninterrupted 'passage space for the spread concreteto pass-between and from the spreading 4devices of the frontlapof the belt means to the `spreading devices onf the rear lap ofthe belt means', meanstoiactuate said ydevices so those in fronti and.in.rearmo,ve in opposite'directions transversely `o`f .the isubgradepand relatively to each .othe r,.whereby .the pressure forces exerted on said lframe?.during.the spreading .operation are. partiallyneutralized, and. afflnishinjg u nit supported ,onfsaidgframa rearwardly Q.I" said first namedfunitllinclllding ascreed. andmea'ns' for. imparting a .reciprocatory afngularf'movernent to. said .screedvv longitudinally .ofl the subgradej to therebv'cmiiactjajmass of. Concrete .spreadbv Said spreader uniti;

2. A iinishing maninefcr the vclass described; in'combination, agmain' frame m ova bl eover a subgrade, wheel means forsaidframe, roadforms on fthe subgradejforming'tracl members foi-'said wheel means, ,operating .means onfsaid frame, a rst transverse sub-frame adjacent the front of said main framacmprising a, spreading unit` vertically` adjustable relative thereto, including endless belt spreading means, associated with vsaid' sub-frame, spreading devices voperable by said belt in 'opposite directions, i and .movable in a plane whollybelow the belt'so that the concretespread by 'front sprei'i'dingA devices may Apassl directly to and be spread by rear spreadingdevices travel-l ing. inan opposite directionQthe pressure forces tending to" shift the wheels and thereby misalign the roadfdrmsfbeing partially neutralized by the pressurefforesexerted in opposite directions by the rspreading devices during the spreading operations, and a second`-sub-frame rearwardly of said first mentioned ,sub-frame, said second subf frame including means for vertically adjusting the 'same and comprising a finishing unit having a screedmember, and a' strike-off plate, said strike-off 1plate operable to level `a mass ofl concrete .spre ad by saidspreading unit', and said screed member including .means'for impartinga -reciprocatcryfvibrating movement to the same longitudinally of the'subgrade whereby the prese' surewforces' exerted onthe main frame andthe wheels areat substantially right angles Ato, the partially neutralized `pressure forces exerted on sais frame and vlfnels said spreading finit; the said frame and wheels thereby reiil'irlin a Substantially stabiliii'ed cdto;

direction of forward bibi/ement of die machine and through which space portions of the ss may pass directly from tile from devices rearwardly to the fear devices, whereby pressure forces exerted on the frame ted'g to' shift the sai/fie' are partially' rieutialied 'dering the 'spreadmeoperationi the spacing of sail; first nienilerled spreading devieesbeibg suon that part of the massf concrete deposited adjacent thereto may new between and past the saine diietlir to the said other spreading' devices and be spread thr'lr.

ii. Iii s'iinisriing'viacbihe 'of trie-blass describen, in onibiiiaijlbn, a frame-endless lbelt type spread iemeahsfor spreading a mass bf biicr'ete, sbieiii therewith, collierising` endless chains, spliced abi-ift spreading' devises operablebili said chains iii one direction, aile 'opties spreading ses vlees operable iii an opposite direction, mounting means vv'liellgrl above and for supporting 'the friiit and spreading devices bietil-lifig a space be; tween there iii the direction br'ffwam more nient of thel machine and tn'roujgn which 'space portions of the :nass intr pass directly 'fr bfitii freni sevices rearwardly yto die rearbeifices, whereby ressre forces tending lto stift trie frame in either anbei-,ieri 'ailing ,thet spreading (iteration "are partially u falaz a, me sessies of sala nsi iii'fitina 'spreading de" yses being such that part of the mass ol ete Being spread may new between ao past tn' and be spread lbil said other spreading devices.

5. ni a niilsliii machine 'of 'the class desselben, in ebrfibiriatibn, affam, endless belt spreading means 'for spreading s hiess of sentirete, assoeited therewitneolplsing frontend 'rear devices for siiecssivly acting on and spreading portions of said mass oppositen directions, mounting means wholly above aria rdf 'supportspreading operation are partially ntl'ied.

e. In a 'iinislii'ng machine if the class described, in bbib'iilatibfi i freine, vdrive on said denis, endless nlns assotato with seid means, spaced from and rear' pedale spreader members movable by said chains in lippesii directions "for spreading 'concrete of tbe like, pressure forces exerted en tbe frame by ilijspradr members moving 'ifi one directies being partially 'iijeu- @rallied bythe pfssiire forces exerted bfi die ffiiie mi alle members moving iii me einer aifeiibii diri-ieg tbs spreading iper-ation, flibustibg ineens wholly aber@ 'ao fr succombe the o portionsi and the guide means being vertically adspae between them in the direction-of forward nivment' of the machine and through Which spa portions of the mass may pass directly fronl' the front members rearwardly to the rear mem* i bers, and guid means for said spreaderv mem: bers separate from said endless chains adapted to maintain the members in a predetermined an: f

spaced iront and rear paddle spreader members' movable by said chains iil opposite directions for spreading concrete or the like, 'pressure' forces exerted on the frame by the spreader members movingr in 'one direction being partially neu; tralized' b`y the 'pressure forces exerted 'on the frame by the members movingr in the other direction during the spreading operation, mount-- ing means wholly above and for supporting the front 'and rear spreading members providing a' space between them in the direction of forward movement 'of the machine and through which space portions of the mass may pass directly from the front members rearwardly to the rear 'melilberst andguide means for said spreader mem= bers separateV from said endless chains adapted to maintain the members in a predetermined angularrelationship with `respect to said chains said mounting -m'ear'l's being disposed in a, plane wholly above the spreader members, the paddle spreader members including shafts slidablilr sup-4 ported in pivots of'the endless chains, the said shafts engaged with the guide means by crank justaible to raise and lower the spreader members with 'respect to the chains and concrete or the like being spread.

9. The combination of a iinishing machine `of the class 'described having a main framei track engaging wheels supporting the same for 'travel frame, including endless chains spaced above and.

carrying spaced front and rear spreader members in opposite directions, for spreading concrete de, posited on the sb'gr'ade, transversely thereof, .a part of the concrete deposited adjacent the spreader `'lflelbers moving in one direction flowiiig therebetween and past the same being spread by the spreader members no'vilflg in the llI/hel dictl, the pressure forces exerted O the freine by the opposltely 'moving spreader meinbrs being substantially equalized whereby transversshifting of the wheels andrad frr'ls'is obviate, mounting means for supporting the front and rear spreading members providing a sp between them through which p'tiiis of the msssl'i'iay pass 4eiiecinf from the front niemearwardly to 4the rear members.

10. The' combination of a finishing machine f th Class described ilclldhg a I'n frame, tiak engaging wheels Supporting the san foi travel sibvemenioter a subgrafle, means for eireetirjis said travel movement, and Ia'd frnS on the Sbg'd'e having' track ptiOS thereon fdi elle ssgeiiiefit by said wheels, endless beitk type spreading means including endless chais 'alying spaced front and rear spreader members movable in opposite directions, supported by said framey mounting means for supporting the front and rear spreading members providing a space between them through which portions of the mass may pass directly from the front members rearangle to the direction of movement of the machine during their spreading operation.

Wardly to the rear members, the said spreader members adapted toi spread concrete or the like deposited on the subgrade in opposite directions whereby during travel movement of the machine part of the concrete deposited on the subgrade will flow between and past the spreader'members moving in one direction and be spread by the members moving in the opposite direction. s

11. In a finishing machine for concrete pavement construction, in combination, a support,

drive mechanism for advancing the support over a subgrade upon which concrete aggregates are deposited to form the pavement, spreading mechanism comprising a series of separate front and rear spreader members spaced apart from each other to enable the aggregate materials to pass the front spreader members to the opposite rear spreader members, means above the spreader 4members connecting the spreader members to Ithe support such that the spaces between the spreader members are unobstructed suciently that the aggregates being spread may pass into yand through the spaces aforesaid as the members spread the aggregates during the"forward movement of .the machine, and means for moving the front Spreader members in one direction and the rear spreader members in an opposite direction and al1 the spreader members at an 12. In a nishng machine of the class del scribed, in combination, a frame, means to move said frame forwardly, spreading means carried by the frame including front and rear spaced apart spreading devices for spreading a mass of concrete deposited on a subgrade, the spaces be-r tween said front and rear devices being suiciently unobstructed such that at least part of the mass of concrete so deposited will pass from advanced portions of said devices between the devices and past the opposite portions thereof during the forward movement of the frame and spreading operation, and means connecting the spreading devices to the Vframe located so as to provide the unobstructed spaces'between front and rear such members.

13. In a finishing machine of the class described, in combination, a support, means to move the support forwardly, spreading means associated with the, support including spaced front and rear paddle spreader members for spreading a

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