US2078863A - Concrete conveyer - Google Patents

Description

April 27, 1937. A. E. L UNDBYE 2,078,863

CONCRETE CONVEYER Filed May 25, 1955 6 sheets-sheet 1 April 27, 1937.

A. E.. LUNDBYE CONCRETE CONVEYER Filed May 25, 1935 6 SheetS-Sheel'l 2 Axel 21.12%@

April 27,1937- A. E. LUNDBYE 2,078,863

v CONCRETE CONVEYER Filed May 25,. 1955 e sheets-sheet April 27, 1937. A. E. LUNDBYE CONCRETE CONVEYERl Filed May 25, 1955 i 6 Sheets-Sheet 4 www,

April 27, 1937 A. E. I UNDBYE 2,078,863

CONCRETE CONVEYER Filed May 25, 1935 G Sheets-Sheet 5 April 27, 1937. A. E, I UNDBYE CONCRETE CONVEYER Filed May 25, 1935 y6 sheets-sheet 6 VAll) Patented Apr. 27,y 1937 UNITED vSTATES PATENT orrlfce 1 Foote Company, Inc.,

tion of Delaware Application May 25,

' 4 Claims.

My invention relates to new and useful improvements in concrete pavers, and more particularly to the means of conveying the concrete from the mixing drum to its point of discharge 5 at any desired position along the boom.

As is well known to those skilled in the paving art, the aggregates, with the exception of what is known as the ready mix, are' generally ele- .vated by a skip to the drum of the paver, and after being thoroughly mixed are discharged into a bucket that travels outwardly on the boom and, in turn, discharged from the bucket at any predetermined point by the operator of the paver.

Also, as is well known, the boom and bucket method of discharge succeeded the previous method of discharging concrete from a paver by means of a relatively short chute that was traversed by the operator to discharge over a rather small radius. l r At the present time, the tendency is to make the concrete pavers of greater capacity and the distribution of the concrete by the boom and bucket method presents certain diiliculties as, for instance, a lengthy boom is necessarily heavy J and when a large Vcapacity bucket is filled With concrete and run out along the boom to its outer end there is a possibility of the paver becoming unstable. o Again, due to the extra capacity now of the drum, valuable time is lost in the delivery, that is, waiting after the bucket is emptied for the return of the bucket to a position under the discharge chute of the -paver for another load. One of the objects of the present invention, u" therefore, is to provide a concrete paver with an endless form of belt conveyer with the addition of what'I term a discharge carriage and to so arrange the endless conveyer, the discharge carriage, and its other associated parts that the aggregates may be continuously discharged from the drum (after being properly mixed), carried on a conveyer'belt to the discharge carriage, and from` which carriage they will be delivered through a hopper to either or both sides of the boom. Provision is also made so that the discharge carriage may be positioned at any point along the boom `for discharging the aggregates rather than only at the end of the boom.

Still another object of the invention is to provide a form of endless conveyer together with a` movable discharge carriage that may be posi tionedat any point throughout the length of the boom, so that the discharge from the drum 55 may be continuous, that is,` aiter each batch Nunda, N. Y., a corpora- 1935, Serial No. 23,490

either side of the boom and over a greater amount of sub-grade than is otherwise possible, thus doing away with the necessity of having several men shovel the concrete after the same has been discharged from the ordinary style bucket.

Still another object of the invention is to provide a form of endless carrier and distributing means wherein the discharge carriage may be quickly run out to a desired position by the operator and the endless conveyer discharge into and from this carriage in a rapid manner.

Still another object of the invention is to provide a form of endless conveyer belt, a discharging carriage, and a boom, which latter is universally mounted with respect to the paver, there also being a form of what might be termed transmission or power operating means driven from the engine of the paver which makes it possible and convenient to quickly traverse the `boom and drive the conveyer belt, the carriage,

and the other associated parts of the conveyer.

Still another object of the invention is to provide a form of endless. conveyer belt and discharge carriage and to provide means for scraping or cleaning the belt as it travels, the scraping action taking place immediately after the materials have been discharged from the conveyer and again out at the end of the boom, so that the aggregates have no chance to harden or stick to the conveyer belt;

Still another object of the inventionxis to pro` vide means for conveniently carrying out 'these several functions by the operator of the paver to thereby provide what might be termed flexibil ity to the machine.

With these and other objects in View, the inven-V tion consists in certain new and novel features and combination of parts, as will be hereinafter more fully explained and pointed out in the claims. I

Referring now to the drawings showing a preferred embodiment,

Fig. 1 is a side elevation of my improved endless conveyer provided with a cooperating movable delivery carriage;

Fig. 2 is a top plan view thereof;

Fig. 3 is an enlarged end elevation, partly in section to show the manner of distribution of the material from the discharge carriage to the oppositely arranged chutes;

Fig. 4 is an enlarged top plan of the rear end of the conveyer and showing the various operating mechanisms;

Fig. 5 is a side elevation of the same;

Fig. 6 is an enlarged transverse vertical sectional view on the line 6-6 of Fig. 5;

Fig. '7 is an enlarged fragmentary top plan view showing the adjustable discharge carriage and delivery chute and some of the associated parts;

Fig. 8 is a side elevation thereof and showing the means by which the belt is scraped during its travel;

Fig. 9 is an enlarged fragmentary plan View of the outer end of the conveyer and its associated parts;

Fig. 10 is a side elevation thereof and showing further means for scraping the belt during its travel;

Fig. 11 is a fragmentary detail showing the driving means for the scraper;

Fig. 12 is a fragmentary transverse vertical section of the conveyer and its supporting means taken on the line I2--I2 of Fig. 9.

Referring now to the drawings, and more particularly to Figs. 1 and 2 for the moment,

Y there is shown fragmentarily a paver I, a portion of the bottom of the frame 2, the upright portion 3 of the frame, and a portion of the top frame 4. There may also be seen, fragmentarily, a portion of the mixing drum 5. The paver per se forms no part of the present invention but it is of the well-known Foote type as shown in several patents, to wit: 1,443,354, of January 30, 1923, granted to Charles E. Foote and 1,478,945, of December 25, 1923, granted to Charles E. Foote.

It will be noticed that there is a boom 6, but this type of boom is not conventional to the above Foote patents and does not carry a bucket of any of the well-known types that are generally associated with the booms of concrete payers. The boom consists primarily of two channel beams 1, as may be seen from Fig. 3, while mounted on the boom is a carriage 9, which carriage will be explained more in detail as the specication proceeds.

It will be understood that there will be the necessary cross braces for the boom, and the inner end (the inner end being the end adjacent the paver) is supported on what I term` a transmission mechanism which is located centrally of the paver I and directly beneath the spout i3, which spout extends into the drum of the paver and also into an auxiliary boot II, which boot extends over the conveyer, as will be hereinafter described. The transmission mechanism, in turn, is mounted on the beamsy 8 forming part of a drop frame I2 permanently aflixed to the front of the paver frame, the members I2 being suitably attached to the standards 3. This arrangement forms a drop seat or platform for the mounting of the casing I4 which, in turn, supports the pivotal end of the boom 6.

This present form of transmission mechanism makes it possible to elevate and to traverse the boom and to operate the conveyer from the power that operates the paver. The transmission per se forms the subject matter of a companion application and will be described here in a general manner rather than specifically.

Referring again for the moment to Figs. l, 4, 5, and 6, there will be noticed a main power shaft I3 which, in turn, is driven from the motive power (not shown) mounted on the paver. This power shaft I3 extends within the casing I 4 of the transmission box and is provided at its end with a pinion I5, which, inturn, meshes With the bevel gear I6, which is mounted at the end of the vertical shaft I'I, which shaft extends through the bearing I8, and which bearing, in turn, has the integral upper plate I9 from which extends downwardly the flange 2D. This ange 20, in turn, has secured thereto the gear 2| by bolts 22, the gear, in turn, located above the plate 23 of the housing I4, which latter is bolted, as at 24, to the extension housing 25 of the housing I4 of the transmission box. The lower surface 26 of the m-ain housing 25 of the transmission box or casing is secured by bolts 2'I to the aforementioned channels 8.

Also located on the top plate I9 is a further housing 28, which forms the rotatable part of the transmission housing, through which passes the transversely extending power shaft 29. This power shaft 29 is driven by the bevel gear 33 meshing with its mate 3| mounted on the upper end of the vertical shaft I'I. The shaft 29 is suitably mounted in bearings 32 near the outer end `of the shaft and on each end there is provided a sprocket 33, each of which is provided with a chain 34 to, in turn, mesh with sprockets 35 that are mounted on the ends of the drum shaft 36, on which shaft there is the drum 3i that drives the conveyer belt 38.

As far as the specication has proceeded, therefore, it will be seen that the power derived from the rotation of the shaft 6 is directed through the various pinions and shafts and sprockets and chains to operate the conveyer drum 3'! and, in turn, the endless conveyer 38.

Also, by mounting the vertical drive shaft I'I in the housing I8 which, in turn, is rotatable in its casing, it will be seen that the boom is capable of traverse about the vertical axis coincident with the vertical shaft il.

Mechanical means are provided for traversing the boom, and if reference is made to 4 and 5 there will be seen on the power shaft I3 a sprocket 39 provided with a sprocket chain 40 which, in turn, actuates the sprocket 4I mounted on the shaft 42. This shaft 42 is only fragmentarily shown and, of course, there will be the necessary bearings provided. On the end 5 of the shaft 42 is the pinion 43 to operate the place clutch 44 which is made up of the two usual mitre gears 45 and 45 which are loosely mounted on the shaft 46. These mitre gears are provided with the interlocking face means (not shown) that may mesh with the shift collar 4l which is locked to the shaft 46, so that the shaft 45 and its worm 48 may be revolved in either direction, according to which mitre gear is locked to the shaft. Shifting means 48 are provided for selectively engaging either one of the mitre gears to be revolved by the pinion, depending on Whether the boom is to be traversed to the right or to the left. The worm 48, of course, meshes with the aforementioned segmental gear 2l, as will be understood from the several views. It will also be seen that the main power shaft I3 also furnishes the power for traversing the boom.

Now means for elevating the boom are also material.

shown; and! although:A I have slf'rowmtl-1e-v means for manually` elevating andi. lower-ingr the boom itr isA withini the@ province; ofi threinventionv tome oha-nically: cpenate the. same?.

Referring: for the moment to Figs., 1 andi 2; there` iss showm mounted on the.` main', frame;A of the: paverz' aw. transverse? shaft? isi suitably mount ed in: bearings-i in. wliilegmountednear; the op:- posits ends of; the shaft i 5l areftheftwor Worms 5l; which, in:- tu1tn,. respectivelymesh with; Worm gearsf-v tra; mountedf. on: their respect-ive;- drumsAv 553;." Separate cab-les extend? from@ these drums to: the. for-ward; end of the-l boom.

Qn: the front of the machineandz at the. top thereof` is pivotallymounted ai. bracket arnn 5dr with A the outer bearings 515; through.- which; passes.- a rod 55, and on the outer endsfofi this rod:- arethelinks; 5il-. Held; by theflinlrs.F 531;, than. is. on, each, side` or. the` boom:V are.` the sheavest bil; an-dextending, overthese: sheaves are the re spective cables- As. the; cables' are. alike,l a. description-of one will beadescriptionofiboth The cable 59 extends forrwardlyf-fromjhedrum 53. over one-.ofthe two sheavesv 58 andthenceftothe encLof the boomfandover.. thefsheavell. heldby.v the links 5l, which 1inksin turnrarevsecuredlto the crossl rod. 62. at.v the. outer` 'end-3 oi the.. boom.. The cable. is then: returned; and. passesN o ver.: the; othen ci, the sheaves., 58.1. and.. thence forwardly again.. and.. fastened. to. a. fixed. arm- Bil ,l formedlon..

the, link. El.. This; arrangement isduplicated. on. the opposite side of the boom so that wherrthe. hand wheel B3 is operatedtheftwo drums 53 will 'be wound or unwound in unison, depending, of

course, upon.. the directiony off rotationi of? the the conveyen beltandi also* the. under` roller,y 64?'.

The belt? maybe offabric, rubbem-onotherdesired? There is also provided at the outer'endz of-theiboomadrum or roller whicheiscmounted onitfhe shaft 66, whchfshaft, irr turn,.is;mounted in* bearingblocks- (fflon:th'e"boom.K Thesefbearingr, blocks`A are adjustable` so` that-theA proper tensioni 4 may bepl'aced. on theconveyer beltlattall times;

By glancingat-IFi'gss 11 andf2, howeverpitrwill'be noticed 'that thev -conveyer 38-doesinots runldireotly from the inner-` drum STI to theL outer'- drum: G5; but, in turn, passes-1upward1`y and sthr-eadedzl about aL dischargeoarriage ilE ands then: outwardlyto thelendi of the boom' andi over` the. outer roller,` and' then back to the innerdrume This discharge, carriage if` may be-seeni in `fdetail in,` Figs; '7i andi 8 and itsprovision makes it possible to; dischargeV the aggregatesA at am7j desiredi placey along? the: boom rather than conveying the material t'o.- the' end offthe boom; whi'chisfthe practice =of=``ordinary endless conveyers.

The discharge carriage consi'stsa of the side f frames 69`Yw-hich are mounted? on thewheels: 10;

Y wardly; as atl T4; to their outer ends-75: The forv` ward ends-` offt'he side -framesl-rareicuti-out, asratY li to,A in reality;forrn-the-legs l1? andi alsoia leg 1&3 which latter extends :forwardly-outfoverthe fore- 1, ward` wheels.` Mounted# on: the upperA surface; off

the. carriage: El isshown. a1. roilen'- 'litirsimilarA to: the rollers` thats exterrd along; thee entire? boom: for the supportofitheibelt' convey-en;

Now before explaining: howsV theoonveyer' is threadedf thrnugl'r` theA carriage; reference` will be made t'o. what l2 term-f the` carriage-i discharge hopper- 80, Whichzformsf-z aipartl. oflithe discharge` carriageg. and-2 this hoppen may: be#V seen also inA detail. in Fig: 3i' This hoppenis-.secured-r toA the forward armssoffthe carriage andiconsist'scof-fwhat' might: be termed the bodyportion, 8h. Its -f lower end is=. bifuroat'ed to-y form: the two separate brancl1es=-3-2`fandi8i (Eigz .3 i, .which-extend laterali-- lyrof the xboomiandv. outwardly l'to' a. position. about'.v in"` line'. with. the cater-pillar:l tractors 34?' ofA thef paver;

It: will. bev noticed-i than the hopper ili is;v open attits: rear; .thaty isi. in; the? upper- `portion 8 I; Yas: at 855. and: extending: transversely of.` the hopper: is theeslrafft.at;M Mountedionf.thisshaftriszthe drum' or; roilera: 8.1 over' which. thery endless: conveyerv is: passed; Iovapointatfthe rear'ofgtherlhopperfand. Onthe carriage; mountedii'n, the?V side'. frames: of: theasame, isaanotherfshaftaomwhiclnismounted:` drum; or` roller; 89;. so: that.v the; endless conveyer belt, elften-passingfoventhexdrumiinxthe' topfJ ofi` the; hoppen will*` again extends Vrea-nwardly aroundi tl'neeroller.W 89T of:` the. car-1i age: and; their. exe tendioutyvardiy andoyenthet-idlersiuntil-itreaches the; drurrn 6.5i mounted; att the f forward: end'. of the boom. Of.c.ourse;.from this. pcint. the conveyer: beltz exbendsirearmardlyrtot the druml 3l mounted at; theA innen4 end ofi thefzboom. over. theddlers 64! It might; be; mentioned here: that: regardless o wherefthefcarriagefisz-nositionedl alongtlfrepboorn;

the length? of the-conveyenbe-lt-will? always `renfiaiui constant-.softhatz-it;isanotneoessaryf-to@use longer on shortenbeltsewhichi mightothenwisebe thev Calset Referring. for: the momenti to.-

3;. it,V willf. be. noticedfthatl. have@provided?.means.w to ldirect the aggregates .from-.the .hopper either. into` the branch 8.1.01'.r into` thel :branch-.85m55- the provision-of a-Y gatel0.`.oner.atingpfrom.the; shaft. 9J ,.whiclfnmay-be providedon-its-.outer end; vvitlfi= ai handle 92;. The swinging` of this, gate inone. direction; will,` of" course. direct. the. aggregates to:- the branch. in the; opposite direction, so..` that the4 concrete. may be. equally. wellz disposed: to either side of.. the boom. Or, if desiredthe gate-couldbe placed: in. a vertical. positionto: direct the aggregates to both sd'esat the same time.A

Whent an. endless. form` of. coni/eyer. is, usedfor. the@ disposition. of. concrete, unless. some.. provi.- sion. is made. for cleaning, thebelt. the` aggregates` are likely toA harden-.onthe belt and, continue to build; 11p-untill they affect. the normal. operation ofthe belt; lhavatherefore, providedtwoseparate means for` cleaning or. scraping. the upper surface of. th'ebelt throughout. the. entire operaf tion of 'the same; B'y referring for. themoment to Figs.. 1 and 3, there will be seen located directly beneath the shaftl Shin the. hopper a second.

shaft @Si which is suitably mounted ink bearings 923, while at* the one end 9.5" there may be seen a sprocket' Stia-nda chain'l", whichlatterextends to' a' sprocket'. 98 mountedA on' the" endl QQ of' theA shaft 85; f

ANow mountedI onthis'shaft 93T- anddirectiy beneaththedrum 8!- a-nd-in Contact: therewith may be seenV ascr-apen |100" which may be provided" withVK helioallyishapedblades: isi-lf, which conta-cti with: the outer-surfac'el of the beltiandion. which surface,` ofi course; the concrete. has. been car-- ried. It-will be-understood that. the endless con-J veyer rotates the drum 81 by its movement thereon and power, of course, is derived from the shaft supporting this drum to the scraper through the chain and sprockets just mentioned.

In the same manner, a further scraper |02 is provided at the outer end of the boom and the driving arrangement may be seen in detail in Fig. 1l. In this instance, there is a sprocket |03 mounted on the one end of the shaft 66, over which passes the chain |04 to operate the sprocket |05 mounted on a shaft |06, which shaft is supported in the bearings |01 mounted on the under sides of the channel beams 1, and on which shaft is the helically-bladed scraper |02. This drum 65 is what might be termed an idler drum, but it is driven by the movement of the conveyer belt which, in turn, through the chain and sprockets just-mentioned operates this scraper |02. The scraper is mounted directly beneath the aforementioned drum 05, so that any of the aggregates that were not removed by the scraper |00 will be removed by the scraper |02 mounted at the outer end of the boom. Thus, the belt is always kept clean and the aggregates are prevented from hardening on the belt during times when the belt is not in operation.

I-Iaving described the boom and the belt conveyer together with the discharge carriage and its hopper, the mechanical means for positioning the carriage and its hopper at any desired point along the boom will now be described.

In Fig. '7, it will be noticed that the carriage 9 is provided with two rear arms |08 and I 09 which are oppositely disposed and extend rearwardly and outwardly over the channels of the boom.

Taking up the lower one, Fig. '7, it will be seen that a cable H0 is attached to the eyelet of the arm |08 and then extends rearwardly (Fig. 4) to a drum III, which is mounted at the one end of the laterally extending shaft IIS, which shaft is suitably mounted in the bearings IM. This cable IIO is then threaded about the drum I II and has the other bight extending forwardly (see Figs. 2 and 9) to a loose pulley II5 mounted on the shaft 66 at the forward end of the boom. The cable extends rearwardly again to an arm IIS (Fig. 7) which is secured to the forward end of the carriage B8, which arm is similar to the aforementioned arm |08, the cable being fastened through an eyelet II1 on said arm.

In the same manner, there is another arm I I8 at the forward end of the carriage and on the same side of the carriage as the arm |09, and there is also a cable II9 secured to the arm |09, which cable extends rearwardly over the drum mounted on the opposite end of the shaft H3. After being threaded around this drum, the cable extends forwardly of the boom and around a loose pulley I2I located on the shaft ES and then extends rearwardly and is secured to the aforementioned arm II8.

Thus, it will be seen that there are cables extending toward the rear of the machine, around drums, and forwardly around pulleys and back to the carri-age, so that a movement of these drums III and |20 will cause the carriage to move forwardly or rearwardly, depending on which way the drums are rotated,

Now to rotate these drums in the desired direction, I provide a face clutch |22 which consists of the usual oppositely located mitre gears E23 and |24 with the slip collar |25 disposed therebetween which is rotatively locked to the shaft I I3, and this collar is operated through the arm |26 and rod |21, so that the collar may be locked in the well-known manner to the face of either one of the mitre gears. These mitre gears are turned in the opposite direction by the pinion |28 located on the stub shaft |29 which, in turn, is provided at its other end with a pinion I 30 that is rotated by the bevel gear I3I which is mounted on the shaft 36 on which, it will be remembered, is mounted the main driving pulley or drum 31. Therefore, as will be readily understood, whenever the shaft 36 is turning, power may be selectively applied to either one of the mitre gears of the clutch to revolve the drums II| and ||9 in either one of the two directions to thus drive the carriage out along the boom or to pull back the carriage to any desired location'on the boom.

It will also be noticed that all of the operations of the endless conveyer, the discharge carriage, and the traversing of the boom are mechanically operated indirectly from the main drive shaft I3, the only manual operation being the elevation or lowering of the boom.

Before describing the complete operation of the conveyer and its carriage, it might be mentioned that in Fig. 5 there is shown in the supplemental chute I0 a manually operated gate |32 provided with a handle |33, which gate is arcuate in shape and provides means for cutting off or o The operation of the boom and its conveyer is exceedingly simple, and presuming that the paver is positioned along a sub-grade, if it is desired to move the boom E to the right or left it will only be necessary to operate the clutch 44 by moving the lever in the desired direction and power, of course, will be provided from the power shaft I3 to the shaft 42 to, in turn, rotate the worm |58 which, meshing with the segmental gear 2|, will traverse the boom in the desired direction.

Inasmuch as the shaft I3 is rotating, it will, through the pinion I5, gear I6, shaft I1, and pinions 3| and 30, drive the main drive shaft 29 and through the sprocket 33 and chains 34 drive the rear pulley or drum 31. operate the endless conveyer belt 38.

Now supposing that it is desired to run the discharge carriage 9 out to a point near the end of the boom 6, the operator will move the rod |21 to selectively turn the drums through the clutch |22 to thus rotate the drums III and |20 in the desired direction. The cables IIS and I I9 threaded about these drums will then take up and pay off and advance or retract the carriage to the desired position, it being remembered that the clutch |22, in turn, receives its power from the pinion |28 driven from the pinion I3I on the shaft 35.

After the carriage is in the desired location, and presuming the aggregates are to be dumped to the right of the machine the small gate 90 wiil be revolved to the position shown in Fig. 3. Inasmuch as the power shaft I3 is revolving, the shaft 29 will be revolving, as will be remembered, and also the shaft 36, and the endless conveyer belt will be traveling outwardly and over the rollers or drums mounted on the carriage 9. Also, the two scrapers, due to their driving means connected with the drum on the discharge carriage and the drum on the end of the boom, will be This, in turn, will driven by their chains and sprockets, so that after the batch has been thoroughly mixed in the mixing drum, the drum discharge chute I0 will be opened and the aggregates fed through the discharge and supplemental chute I0', and the gate 132, being regulated by the handle |33, will permit the desired amount of aggregates (not shown) to fall on the endless conveyer belt 38.

The material will travel outwardly Von the belt and then upwardly along the discharge carriage, and as the conveyer belt passes over the drum 81 the aggregates will fall into the hopper 80 and some will pass directly out of the branch 82 while others, striking the gate 90, will also be deflected into the branch B2, and as the conveyer belt continues in its motion the concrete will be continuously fed from the chute 82 as fast as it is fed onto the conveyer.

As any given point of the belt passes over the drum 8l, any sticking aggregates will be removed by the revolving scraper |00. The belt then travels inwardly into the carriage and around its pulley and then outwardly to the end of the boom over the drum 65, and as it passes under the drum it will be brushed by the sprocket driven scraper m2. The belt (given point) then returns to the drum 3l at the rear of the boom and then starts out on another cycle.

Of course, the gate Sil can be swung in either direction to dispose of the aggregates on either side of the machine, or the gate might be left in a vertical position to distribute some aggregates on the one side and some on the other.

It will be understood that it is but the matter `of a moment to move the discharge carriage along the boom, and this movement can take place either while the 'concrete is on the conveyer belt or before the conveyer belt is loaded with the concrete.

From the foregoing, it will be seen that I'have provided means for distributing the aggregates in a continuous manner at any point intermediate the ends of the boom.

Inasmuch as the present tendency is to make mixing drums of relatively large capacity and as the size of the ordinary bucket used on the booms has to be of a limited nature, time has been lost while waiting for the return of the bucket. Furthermore, when the aggregates are disposed in the present manner,l they have a tendency to spread further over the sub-grade than where say a cubic yard of concrete is dropped from the bucket at the one time.

Also, by providing mechanically operated Scrapers, one Vlocated at the discharge carrier hopper and the other out at the end of the boom, there is no possibility of the aggregates drying on and sticking to the endless conveyer belt.

Finally,it will be seen that all the power neces-Y `claim my invention broadly as such, but what I do claim and desire to 'secure by Letters Patent isz- 1. In combination with aconcrete paver, a supporting means and power transmission located centrally and in front of the paver, and a boom centrally mounted at its one end on said Supporting and transmission means, means cooperating with the transmission means and with the boom for selectively traversing the boom in the desired direction, an endless conveyer belt mounted on the boom, means cooperable with the transmission mechanism for driving said conveyer, adischarge carriage provided with a hopper mounted on the boom, selective means cooperable with the transmission mechanism for directing a forward or rearward movement of said discharge carriage on said boom, the discharge carriage provided with two rollers, and the conveyer belt passing over one and under the other and then to the forward end of said boom whereby material on said conveyer belt will be discharged to said hopper.

2. In combination with a concrete paver, a supporting means and power transmission located centrally and in front of the paver, a boom centrally mounted at its one end on said supporting and transmission means, means cooperating with the transmission means and with the boom for selectively traversing the boom in the desired direction, an endless conveyer belt mounted on the boom, means cooperable with the Y transmission mechanism for driving said conveyer, a discharge carriage provided with a hopper mounted on the boom, selective means for directing a forward or rearward movement of said discharge carriage on said boom, cooperable with said transmission mechanism, the discharge carriage provided with two conveyer rollers, the conveyer belt passing over one and under the other and then to the forward end of said boom whereby material on said conveyer belt will be discharged into said hopper.

3. In combination with la concrete paver, a power transmission located centrally in front of the paver, a boom centrally mounted at its oneend on said transmission, means cooperating with the transmission and with the boom for selectively traversing the boom in any vdesired direction, an endless conveyer belt mounted on the boom, means also cooperable with the transmission mechanism for driving said conveyer, a discharge carriage provided with a bifurcated hopper mounted on the boom, the endless conveyer passing over and through said carriage, selective means also operable with said transmission for directing a forward or rearward movement of the discharge carriage on said boom, and means for directing the aggregates to either side of the bifurcated hopper after leaving the conveyer.

4. In combination with a concrete paver, a

combined supporting means for the boom and power transmission located centrally in front of the paver, a boom centrally mounted at its one end on said supporting means and power transmission, means cooperating with the transmission and with the boom for selectively traversing the boom inthe desired direction, an endless conveyer belt mounted on the boom, means also cooperable with the transmission mechanism for driving said conveyer, a discharge carriage mounted on said boom and provided with a bifurcated hopper the legs of which extend downwardly from the opposite sides of the boom, the endless conveyer cooperating with the carriage to discharge the contents of the conveyer, selective means also cooperable with the transmission means for directing a forward or rearward movement of said discharge carriage o-n said boom.

AXEL E. LUNDBYE.

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