US2215455A

US2215455A - Road paver

Info

Publication number: US2215455A
Application number: US115976A
Authority: US
Inventors: Clyde G Abernathy; Axel E Lundbye
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-12-15
Filing date: 1936-12-15
Publication date: 1940-09-24
Anticipated expiration: 1957-09-24

Description

sept. 24, 1940.

-RoAD PAVER Filed Dec. 15, 1956 7 Sheets-Sheet l Sept. 24, 1940.

c. G; ABERNATHY ET AL ROADIPAVER Filed Dec. l5, 1936 7 Sheets-Sheet sept. 24, 1940.

c. G. ABERNATHY ET Al.

ROAD PAVER Filed Dec. l5, 1956 '7 Sheets-Sheet 3 c. G. ABERNATHY ET Ai. 2,215,455

ROAD PAVER Filed Dec. 15, 19:56 7 sheetsusheet 4 Sept. 24,

.wNNA mm Sept; 24, 1940. c. G. ABERNATHY x-:rAEALv ROAD PAVER 7 Sheets-Sheet 5 Filed Dec. l5. 1936 SWK INVEN-roR MCX ATTQRNEYSW Sept. 24, 1940.

c. G. ABERNATHY. gtr AL 2,215,455

ROAD PAVER 7 Sheets-Sheet Filed Dec. l5, 1936 Sept. 24, 1940. c. G. ABERNATHY ET Al.

ROAD PAVER Filed Deo. 15, 195s 7 sheets-sheet 7 V Il a-wl y TTORNEYSOH INVENTOR Patented Sept. 24, 1940 PATENT :OFFICE RGAD PAVER y Clyde G. Abernathy, nomen, and Axel E.

Lundbye, Nunda, N.

Application December 15, 1936, Serial No.' 115,976

18 Claims.

This invention relates to a road paver and.

more particularly to amachine for laying and grading stone and asphalt mixes upongroadways and resurfacing the same or in providing an original surface or base for the road. The machine can be used for laying and grading either cold mixes or stone, asphalt and solvent for the asphalt or hot mixes of asphalt and aggregate. In laying and grading asphalt and stonemiatel" rials on a roadway considerable dimculty has been encountered by reason of the'fact that the stone and asphalt mix is extremely heavy and diiiicult to handle and lay to an accurate surface.

It is theprincipal objectofthis invention to l5 provide a machine which lays and grades heavy mixes of asphalt and stone, or the like; which will handle large quantities of such mixes and rapidly and accurately grade the same to provide' the smooth and uniform surface desired; and which accomplishes this without'requiring any handling of the mix, the mix being dumped directly into the hopper of the machine from thetrucks used for transporting the mix to the Job.

the paver shown and described in the Clyde G. Abernathy Patent No. 1,994,082, .dated March 12, i935, and also shown in the copending applica,- tion of Clyde G. Abernathy, Ser. No. 744,933, led April 21, 1934. In the paver forming the subject of both the present application and the said Abernathy patent and application the paver consists generally of a frame having'iront steering wheels which ride along the surface to be paved, rear rollers or wheels which ride upon the surface laid by the machine. a hopper disposed at the center of the carriage betweenthe front and rear 4wheels and a horizontally reciprocating toothed cutter bar which cuts oil the column of paving material being discharged from the hopper. This cutter bar is located below the hopper and therefore it grades the road along a line determined by the differential in height between the `front and rear wheels of the paver so that a substantially smooth pavement is laid even though the front wheels are riding over an extremely rough and irregular subgrade. The smoothness of the finished roadway is further increased .by the usual'practice of laying the roadway in two layers, the iinishing of the final layer by the machine providing a specially smooth and uni- Y form roadway. With such a paver all necessity for the use of forms and the like is eliminated. `In addition to the objects set forth inthe said 55/ Abernathy patent and application, the present The presentinvention is an improvement on` Y replaced to its initial application is directed to improvements:

A further object of the present invention is to provide a simple and convenient means for independently adjusting each of the front steerf ing wheels vertically relative to the carriage and hopper carried thereby. By this means a rough adjustment: of the thickness of the layerkbeing laid can be obtained and also the height of the two wheels can be independently adjusted to meet different conditions encountered on a roadway, such as a highly crowned subgrade on which it is desired to lay a slightly crowned surface, it being understood that the roadways are generally laid in parallel strips.

Another object of the present invention is to provide -a simple and convenient means for adjusting the curvature of the reciprocating cutter bar from the operators platform to obtain any desired crown of the road. y

Another purpose oi the present invention is to provide a quick lift for the cutter bar which permits the cutter bar to be quickly released and elevated'and as quickly returned to its initial position. It frequently happens in paving a road that an intersecting paved road is encountered. 'I'he quick lift for the cutter vbar permits of quickly lifting the cutter bar after which the paver can be transported to the other side of the intersecting road; the cutter bar position and the paving continued. It will -also be understood that this quick release permits of quickly elevating the reciprocating cutter bar if an obstruction should be encountered. 35 Another aim of the present invention isl to provide a simple and eiective means for heating the reciprocating cutter bar, such heating insuring the smooth operation of the cutter bar in cutting through the column oi' hot mix and also in perfecting its action in ironing the surface of the roadway being laid. y'Ihe heat. for this purpose -is preferably derived from the exhaust gases of the gas engine which is used for driving the paver and reciprocating the cutter bar, but 45 it will also be understood that the hot water developed in the cooling system oi' the gas engine might also be employed and also that the heat might be applied from a separate heating device such as a torch or the like. l

Anotherpurpose of the present invention is to provide an indicator in the form of a bubble level which'indicates the tilt or list oi' the paver carriage. 'I'he purpose of such a bubble level i's' to facilitatethe laying of a crowned roadway 5s the following separate in a plurality of parallel strips. Thus, in laying a strip along one side of a crowned roadway the front wheels are set to maintain the desired list and the bubble indicator is set so that its bubble is centered at this list. Any departure from this desired list, of course, immediately shows on the bubble indicator and the proper adjustment to compensate can be made.

Another object of the present invention is' to provide a simple and effective means for applying lubricant to the rear rollers so that there is no danger of any of the freshly laid roadway sticking to the rollers. l

vAnother purpose of the present invention is to provide a dolly which can be used to support either end of the cutter bar. 'Ihis dolly is provided with a pair of rollers which are extended to ride upon a strip oi' paving material already laid and which serve as a gage with the 'corresponding end of the cutter bar, thereby to insure a smooth and uniform joint between the two strips. It will further be seen that by the use of such a dolly, plus the level indicator, the gaging of the strip of roadway being laid can be gaged exclusively 'from the strip of pavement already laid and on the edge of which the dolly rides, since any departure from the proper list of the paver in laying the second strip will be immediately detected on the bubble level. y

Another object of the invention is to provide a paver having a simple means for blocking of! any desired portion of the hopper so that the paver will lay a strip of less than the maximum width, this blocking off means being quickly inserted in the hopper and also quickly removed. Another object of the invention is to provide a paver having a vertically adjustable reciprocating cutter bar which determines the grade 'and which is spring supported to permit it to yield slightly in a vertical direction on encountering large obstacles and in which a gage is,

provided which is connected to the cutter bar adjusting mechanism above the spring support so that such` minor accidental fluctuations in the elevation of the cutter bar which are compensated by the springs do not register on the gage. Another object of the invention is to provide a simple and eiifective means of adjusting the `height of the cutter bar and which includemeans for adjusting the tension of the above spring support for the same as set forth above., Another object of the present invention is to provide a simple and convenient means for providing any desired crown in the cutter bar so that thev surface laici has the desired crown.V

s time the crown to which the cutter bar is set to provide. v

- Another purpose is to provide means operable from the same hand wheel which adjusts the crown of the cutter bar for adjusting the crown of the group of tampers which followthe cutter bar, thereby providing -a single adjustment for the crown of the cutter bar and the tampers and avoiding irregular tamping.

Another purposeof the present invention is to provide a simple and efficient scariiler for roughening the paved surface laid by the paver preparatory to its being subsequently rolled.

Other objects of the present invention .will appear from the following detailed description.

In the accompanying drawings the paver is 5 shown after having been stripped of a number of details forming no part of the present invention, reference being made to the said Aber-A nathy Patent No. 1,994,082 for a complete showing of such details.

Fig. 1 is a top plan view of the paver embodying our invention.

Fig. 2 is a ,fragmentary vertical longitudinal section, taken on line 2 2, Fig. 1 and showing the level indicator. 15

Fig. 3 is a front elevation, looking forwardly of the level indicator shown in Fig. 2.

Fig. 4 is a side elevation of the paver.

Fig. 5 is a fragmentary view, similar to Fig. 4, and showing the cutter bar supported at one 20 end by a dolly which in turn is supported on the edge of a strip of pavement already laid.

Fig. 6 isa vertical fragmentary section, taken on line i-I, Fig. 5.

Fig. is a rear elevation of the paver.

Fig. 8 is a fragmentary vertical fore and aft section taken on line 8 8, Fig. 'I and showing the roller mounting for the sub-carriage which carries the scarifler.

Fig. 9 is a vertical fragmentary fore and aft 30 section taken on line 9-9 of Fig. 7 and showing a part of the drive mechanism for reciprocating the scariiier subcarriage.

Fig. 10 is a horizontal fragmentary sectiontaken on line Iii-I0; Fig. '1 and looking down- 35 wardly upon the scariiier.-

Fig. 11 is a vertical fragmentary section on an enlarged scale through the adjustable pintle which supports each fr ont wheel for steering movement, this view showing the means for adjusting each steering wheel vertically.

Fig. 12 is a horizontal section taken on line |2-|2, Fig. 11.

, Fig. 13 is a vertical fragmentary fore and aft section taken on line |3-I3, Fig. 1, and show- 45 ing the quick-lift device for quickly elevating the cutter bar out of operative positioh and returning it to the same position.

Fig. 14 is a vertical fragmentary section taken on line I4M, Fig. 13.

Fig. 15 is a'transverse section through the road paver showing the means for adjusting the f curvature of the reciprocating cutter bar by a single adjusting wheel located on the platform.

Fig. 16 is a transverse section through the 55 paver taken somewhat to the rear of the section forming Fig. 15 and showing the tampers which tamp the roadway after having been graded by the cutter bar. f I

Fig. 17 is an enlarged fore and aft section 60 takengenerally along line I'l-|'|, Fig. 16 and showing the manner in which the tampers are reciprocated and also showing the manner in" which the curvature of the line of tampers is adjusted to conform to the curvature to which .65 the cutter bar was adjusted.

Figs. 1 8 and 19 are diagrammatic views showing the manner in which the cams which adstraight.

Fig. 20 is a view similar to Fig. 19 showing 75 2liA broken away,'and showing a modied form of the means for adjusting the curvature of the cutter bar and also the curvature of the tam-pers.

Fig. 23 is a fragmentary enlarged view of the adjusting means shown in Fig. 22.

Fig. 24is afragmentary vertical fore and aft section taken on line 2424, Fig. 22.

Fig. 25 is a vertical section, taken along line 25-25, Fig. 22.

Fig. 26 isl a vertical fore and aft fragmentary section through the roller which contacts with and oils the main roller of the paver, this section being taken on line 28'28, Fig. 7.

Fig. 27 .is a vertical transverse section, taken.

' on line 21`-21, Fig. 26..

cross beam 32 connects the rear ends o1" all of l,

the side beams 38 and 3| and the cross beam 33 is arranged adjacent the center of the carriage and cross connects the inner channels 3|.

The rear end of the carriage or frame is supported by a pair of

rollers

34 and 35 which are arranged toride upon the surface freshly laid by the machine and each roller is independently supported at its opposite ends in yielding bear` ings provided at the lower ends of brackets 38 which project downwardly from the frame of the carriage, the bearings permitting they 'rollers to adapt themselves to the crown of the road. The front end of the machine is supported by a pair of

steering wheels

31 and 38 which are adapted to ride upon the subgrade or surface which is to be paved. y

Between the front steering wheels and the rear rollers is disposed. a hopper 40 having side walls 4l and 42, a rear Wall 43 which is preferably vertically disposed and a front wall 44 which is disposed at an angle, the front. end thereof being comparatively low and being supported by an angle bar 45. The rear end of this front wall 44 is supported by an angle barA 46 and terminates is an elongated opening 41 which extends the full width of the hopper between the rear end of the front wall 44 and the bottom of the rear wall 43. Through this opening 41 the material is discharged onto the subgrade being surfaced. e

The paver is propelled by a gas engine 58Vwhich is mounted upon the operators platform 48. This gas engine. drives, through gearing-containe'dinl a gear boxA 5|, a transmission contained in a transmission housing '52. The transmission contained in the housing 52 drives a-chain 54 (Fig. 7) -which chain in turn drives a sprocket 55 on a countershaft 58.- This countershaft has fixed thereto a pair of sprockets which drive chains 51, these chains driving sprockets fast to the

separate axles

58, 58, one axle being provided for each

roller

34 and 35. The independent axles of the two

rollers

34 and 35 are shown as being mounted at each end in bearing blocks sa eachof which is slidingly mounted in vertical slideways provided in each bracket 36 suiliciently loosely to permit tilting of the

axles

58, 58 and thereby permit the

rollers

34, 35 to independently adapt themselves to the crown of the road. Each bearing block 88 is supported by acompression spring 89, the pressure of each spring being independently adjustable in any suitable manner as by the adjusting screw shown in Fig. 7. While each axle 58 is shown as being sup;- ported ateach end in the spring backed bearthe inner or adjacent ends of the

axles

58, 58 to permit the inner ends of the

rollers

34, 35 to move upwardly or downwardly and adapt themselves to the crown of the road being laid.

It will be understood that the transmission contained 'within' the housing 52 is under suitable manual control so that the gas engine can be connected to propel `the paver or be disconnected therefrom at will. Such control levers are completely illustrated in the said Abernathy application Ser. No. 744,933, but inasmuch as this control forms no part of the present invention it is notillustrated inthe present application.

y The gas. engine 50 also rotates a rakerbar 59 as the paver travels, this raker bar 59 serving to mix the material in the hopper 48 and insure its free passage through the slot 41 in the bottom of thehopper and also serves to spread the ymaterial uniformly along the hopper,the ma,- `terials being dumped into the hopper directly from the truck. For lthis purpose the `raker bar includes a shaft whichis square in cross section at its center and its ends are journaled in bearings at the side walls 4I and 42 of the hopper. Aplurality of L-shaped blades 8| are mounted on the square faces of the raker bar shaft, -these blades being capable of adjustment as to angularity so' as to vary theirspreading action in accordance with the particular material being. handled, as more fully set forth in the said Abervnathy application. lThe drive for the raker bar includes a. pinion 82 mounted on the transverse drive shaft 53 which is driven by-the gas engine, as previously described. This pinion 82 meshes with a gear 83 which is fast to a iackshaft 84, this Jack shaft being Journaled in a suitable bracket 85 carried by the main frame. This jack shaft also carries` a sprocket which drives a chain 88,`this chain driving a sprocket 81 fast to the raker bar shaft 80.`

Each oi' the front steering wheels 31 andv 38 is adjustable as to height independently of the other. For this purpose the ends of each pair of side channels 38 and 3| are welded to a steering bearing 10 which carries the steering spindle I 1I. This spindle is iixedly secured to a steering knuckle 12 in any suitable manner and the lower end of this knucklev carries thel stub axle 13 of the corresponding steering wheel 31' or 38. A steering arm 14 projects laterally outward from each steering knuckle and is connected to a drag e link 15. 'I'he other end of each of these drag. links 15'is connected to an arm 18 the two arms' 18 being fast to a cross shaft 11, this cross shaft being suitably journaled inthe main frame and extending underneath the lower wail 44 of the hopper. lOn this shaft is mounted a worm wheel 18 which is driven by' a worm 19 on the steering shaft 80. The steering shaft 80 extends up to the drivers' platform 48 and is driven by the usual steering wheel 8l.

. ing block 58, such blocks are only essential at providing this adjustment is to provide a roughA adjustment for the thickness of the layer deposited through the hopper and also to permit of adjusting the entire carriage to any desired angularity or list as conditions may require Thus, if it is desired to resurface a highly crowned road with a pavement having a smaller crown and it is necessary to build up the roadway in parallel strips the front wheel nearest the curb is adjusted so that that side of the carriage is elevated relative to the side of the carriage nearest to the center of the road. By this means it will l be seen that more material can be layed to the curb by raising the front wheel on one side.

'I'he hopper 40 is not, of course, of sumcient size to take an entire load from the trucks which transport the material to the job.- In order to facilitate the discharge of the material from the truck into the paver the truck is backed up bel tween the front wheels of the paver and until its rear wheels engage rollers 84 mounted on the angle bars 45 of the hopper. As the paver moves along the Ypaver pushes the truck forward, the truck gradually emptying the mix into the hopper. The truck wheels, of course, rotate as the truck is pushed along and as the rollers 84 will rotate with the truck wheels it will be seen that these rollers provide a rolling drive between the paver and the truck. When the truck has been completely discharged, it is driven away and an'- other truck brought 4up against the rollers 04. This provides an extremely simple means for handling the problem of keeping material in the hopper. 4

The hopper 40 is provided with a power cutoff or closure which closes the slot 4 1 in the bottom of the hopper when desired. The purpose of such a power cutoff is to permit of transporting the paver over areas which are not to kbe paved. Thus, if an intersecting paved road -hopper and is slidably mounted under the lower wall 44 so as to be movable under the discharge slot 41 of the hopper and close this slot. The support for this plate can be of any suitable form. To this closure plate B1 is secured a rack 88 which is driven by a gear 80. This gear is mounted on a shaftwhich is drivenby a bevel gear 80, this bevel gear being driven by a pinion 9| on an angular shaft 92.v This shaft is driven by a manually operable clutch (not shown) for Athe jack shaft. It will also be seen that this power cutoff can be used to clear the path for the paver under certain conditions. Thus.'

if the supplying truck should accidentally drop A a large mass of the paving material on the road to be leveled oil.' by hand to prevent the from becoming stuck. However, it will be seen that the provision of the power cuto avoids the necessity of so doiiig since the operator can move the hopper up to the'obstructing mass and then `close and open the power cutoff, the plate 81 operating as a leveler and cutting down the obstructing mass on the advance of the paver to permit the hopper to pass thereover.

It is frequently desirable to lay a strip of pavement less than the full width of the hopper. To do this it is necessary to block off a portion oi' 'the hopper. The means for so blocking c' portions of the hopper include a series of narrow plates 93 having holes at their opposite ends, the'se plates fitting over a series of pins 94 provided in the bottom of the hopper along the discharge slot 41. These series of pins extend inwardly from opposite sides of the hopper to a point vproviding `the narrowest strip which would be desirable to lay, no pins being necessary for a substantial distance from opposite sides of the center of the hopper. The innermost of the plate or plates 93 preferably has attached thereto an edger plate 95 which extends forwardly under to secure or `mold a square shoulder at the edge' of the strip being laid. The material being discharged from the hopper is cut to an accurate grade by a toothed cutter bar |00, the teeth of which project forwardly under the opening 41 of the hopper so that the cutter bar cuts into the column of material being deposited from the hopper. This cutter bar is reciprocated; the opposite ends thereof are independently adjustable as to height so as to be adjustable to meet any conditions encountered; it is capable of -being curved to provide any desired crown in 4the surface finished by it; is provided with a quick release so that it can be 'quickly elevated and replaced toits original ing paved road; and is also heated so as to facilitate its cutting through the mix and also to provide an ironing action.

The cutter bar includes a channel |I, as best shown in Figs. 13 and 14, which is not only set hat but also is provided with a series of slots in its flanges, as best shown in Fig. l5, s0 that it can be exed vertically. To the bottom of this channel are welded a pair of strips |02,

and to the bottom of these strips are secured, in any suitable manner, a series of cutting plates |03 which project forwardly and have their front` ends pointed so as to form the teeth of the cutter bar. These plates are, of course, rendered removable so that they can be replaced as they wear and these teeth project forwardly under the rear wall 43 of the hopper so as to cut into the column of material being discharged from the hopper. l

The cutter bar structure which is described is reciprocated along a track |04, the curvature of which can be adjusted. The connection between the cutter bar and the track |04 includes a plurality of `bearing brackets |05 which, as best shown in Figs. 13-15, are rigidly secured at spaced intervals to the upper face of the channel 0| and each of which carries a pair of rollers |06 and |01 which engage the upper and lower sides,

^ respectively. of the track |04. The cutter bar is reciprocated in any suitable' manner. as by a link |08 which can be reclprocated by the gas engine 50 in any suitable'manner, such as is shown in the said Abernathy patent. The teeth of the cutter b'ar structure extend completely to the end of the channel I 0I and are projected beyond the sides of the hopper as the cutter bar is reciprocated By this means, in laying a strip of paving material against a strip which has alby a link IH which links are pivotally connected to the front lower corners of the side plates 4I and 42 of the hopper. These links take the rearward thrust of the `cutter bar in moving forwardly and cutting off the column of material being discharged by the hopper. To permit of independently raising or lowering either end of the cutter bar assembly an angular bracket H2 is secured to each end of the anglebar I I0 and the adjusting mechanism is secured to this angular bracket H2. Each adjusting mechanism includes a bracket I| 3, the two brackets being connected to the carriage or frame of the paver by a common quick-lift device indicated generally at H4. The quick-lift device includes a cross shaft I I5 which is suitably journaled in brackets H6 on the cross channel 33 and at each end has a crank lever I I1, the crank pin of which is in the form of a cap screw H8 which connects the free end of the crank lever with the corresponding bracket H3, as best shown in Figs. 13 and 14.

Another bracket |26 is secured to the cross beam 33 adjacent the ratchet wheel H9 and carries a swinging hand lever |26. This hand lever carries a pivoted pawl |21, the free end of which is formed to provide a tooth which engages the teeth of the ratchet wheel I I9 and the other end of which is connected to a rod I28.which is lifted against the resistance of a spring |29 by a small L-shaped lever |30 pivoted to the upper end of the hand lever |26 adjacent the grip of the hand lever |26. The spring |29 normally holds the pawl |21 out of engagement with teeth of the ratchet wheel I9 and when both the hand lever |26 and the small lever |30 are gripped so as to move the small lever |30 toward the grip of the hand lever |26 the 'rod |28 is elevated so as to throw the tooth of the pawl |21 into engagement with the teeth of the ratchet wheel H9.

The majority of the -teeth of the ratchet wheel H9 are of regular ratchet form but these teeth terminate in a special .locking recess '|3I. This locking recess has parallel sides-extending substantially in a radial direction and the tooth |20 of the detent |2| is similarly shaped to have parallel sides and exactly fit the .recess I3I. Therefore, when the tooth |20 is engaged in the recess ISI the ratchet wheel is locked against rotation in either direction. In order, therefore, tolft thc cutter bar from its, say, operative position by the quick release device it is first necessary for the operator to step on the treadle |24v so as to withdraw the tooth |20 from the locking recess I3I. Upon then gripping both the grip of the lever |26 and the smallL-shaped lever |30 the small lever |30 is moved so as to depress the rod |28 against the resistance of the spring |29 and throw the dog o-r pawl |21 into engagement with the teeth of the ratchet wheel H9. Upon then swinging the hand lever |26 rearwardly the ratchet wheel H9 is rotated and the operator thereupon releases the foot treadle. |24

.so that the spring |23 moves-the detent I2| so lthat its tooth engages one of the ratchet teeth of the ratchet wheel H9. It will be seen that in the continued elevation of the cutter bar assembly the detent |2| acts in the manner of an ordi- I nary detent and that by reciprocating the hand lever |26 and pressing upon the small L-shaped lever |30 on each backward stroke and releasing it on the forward stroke the ratchet wheel is turned and held in any turned position. The turning'of the ratchet wheel o-f course rotates thecross shaft H5 and its crank arms H1 elevate'the brackets 3 thereby lifting the angle bar III and thel track and cutter bar assembly carriedthereby. It will be seen that by reversing the operation of the pawl and detent |21, I2 I, the cutter bar assembly can be lowered to any desired position.

In-order to prevent accidental operation of the quick release through the operator inadvertently stepping on the treadle |24,.a locking device is "provided which, as best shown in Fig. 13, consists of a. sliding plate |32 slidingly securedto the main frame by bolts |33 and carrying a screw |34. The plate is so arranged that when the quick-lift is raised the operator can kick the plate |32 under the treadle |24, the screw |34 then preventing the treadle from being accidentally depressed.v The screw, of course, provides an adjustable stop.

Each of .the brackets H3 carries an adjusting mechanism by which 4the corresponding end of the cutter bar assembly can be adjusted vertically relatively to the carriage. For this purpose the bracket is povided with an upper arm |35, an intermediate arm |36 and a lower arm |31, as best shown in Fig. 14. In the upper arm is threaded a vertical screw shaft |38 which is turned by a hand wheel, |39. The lower end of the screw shaft |38 is rotatably secured to a vertically movable slide block |40 'so that upon turning the hand wheel |39 this block is elevated or depressed. This block is guided in the bracket I I3 and preferably suitable graduations, as indil cated in Fig. 4, are provided toindicate the relative position between the bracket H3 and the block |40. To the sliding block |40 is also connected a vertical rod- I4I upon which the corresponding end of the cutter b'ar assembly is hung.

This rod is preferably screwed into the block |40 and held in position by a lock nut and its lower end extends through the top of thel bracket .I I2. A head |42 is provided at the lower end of this l'rod I4I and a relatively small compression spring |43 is interposed'between this head and the underside of the bracket H2. A sleeve |44 surrounds the intermediate part of the hanger rod |4| and is guided by the intermediate and lower arms |36, |31 of the bracket H3. A rotatable hand wheel |45 is mounted on-the upper `threaded end ofthe hanger rod |4| and is adapted to engage the upper end of the sleeve |44.

The lower endof this sleeve bears against a coling direction. This elevates or depresses the corresponding end of the angle bar ||0 and consequently -elevates the track and cutter bar supported thereby. 'Ihe purpose o the opposing springs |43 and |41 is to permit the cutter bar assembly to yield slightly in its operation of cutting through the column of asphalt being dis- .charged by the hopper. In order to balance the action of these springs, after the desired adjustment of the height of each end of the cutter bar has been obtained through. the hand wheel |36, the hand wheel |45 is turned to relieveor increase the pressure exerted by the spring |41 downwardly upon the cutter bar assembly. The upper spring |41 is preferably heavier than the lower spring |43 to better resist the tendency of the cutter bar assembly to lift because of its compressing action caused by the inclined cutting edges of its teeth.

In surfacing a highway the pavement is laid in several strips and where one striphas been accurately laid it is desirable to'be able to gage the height of the contiguous strip from the edge of the strip already laid so that the two strips` form smooth continuations of one another and the joining of the ,two strips is effected without a seam. Also in laying the original. strip it may be desirable or required that a forni be used to pave from, such forms being in the nature of temporary rails accurately placed and leveled at the sides oi the highway. Ordinarily two such forms are used, the present invention permitting of using one as a level gage surface. To permit of gaging the height of a strip being laid from the surface at the edge of a contiguous strip or from a single form ,the dolly shown in Figs. 5 and 6 is employed. This dolly is in the form of a bracket |50 carrying a pair of small rollers |5| which are adapted to ride upon the surface, near the edge, of a strip of pavement already laid or upon the form. The bracket |50 is provided with a pair of spaced vertical slots |52 and the dolly is secured by a pair of bolts |53 to a small angle bracket |54, this bracket in turn being secured to a small angle piece |55 welded on the rear, face of the angle bar ||0. 'I'he bolts |53 extend through the slots |52 so that the position of the dolly relative to the angle bar |I0 and hence the cutter bar assembly can be adjusted.

Cooperating in use with the dolly is a leveling device, illustrated in detail in Figs. 2 and 3, and consisting of a swinging bracket |56 which is pivoted to the main frame of the paver to` swing about an axis parallel with its line of movement on a.pivot bolt |51. The leveling bracket |56 is preferably pivoted to the frame at a point within convenientreach and observation vfrom the operators platform 48, such as the top rail of the rear wall 43 of the hopper 40, At its top the bracket |56 carries a bubble level |58 oi any usual and well known type and at its bottom this bracket carries a scale |59 which traverses a fixed indexing pointer |60. The bracket |55 is provided at its lower end with an arcuate slot through which a stud projects which carries a wing nllt I6I. It will be seen that by loosening the wing nut |6| the bubble level |56 can be swung to any position relative to the hopper and upon tightening the wing nut |6| this relation can be maintained. Since the bubble level |56 extends transversely of the paver it will be seen that the bubble level will indicate any list of the machine and it will further be seen that by the adjustment of the bracket |56 the paver can be set to have any desired list, and this list maintained by watching the bubble in the bubble level and adjusting the elevation of one end of the cutter bar to maintain this list.

Assuming that one strip of pavement or a single form has been Vaccurately laid and lt is desired to lay another strip against it, the dolly |50 is attached to the bracket |54 by means of the bolts |53.- The height of the cutter bar is adjusted so that the teeth |03 engage the upper surface of the strip already laid and the bolts |53 are then tightened so that the dolly malntains this position of the cutter bar as the paver moves along. Ihe opposite side of the cutter bar assembly is then adjusted, through the medium of the opposite hand wheel |36, to obtain the desired thickness of pavement on the oppoposite sideof the strip being laid. 'I'he level indicator shown in Figs. 1, 2 and 3 is then ad- `iusted so that the bubble is in the center of the bubble level |58. The paving thereupon proceeds with one side oi the cutter bar gaged from the strip of pavement already laid or gaged from the form. If'the bubble ln the bubble indicator deviates from the center the operator adjusts4 said other hand wheel |39 so as to elevate or drop the` free edge of the strip being laid back to the height desired and hence bring the bubble in the bubble level |58 back to the center. In this manner is will be seen that extreme accuracy can be obtained not only in working the strips together at their edges to form a smooth continuation of one another, but also in accurately maintaining the level of the opposite side o! the strip being laid.

In' order to provide a square shoulder at the opposite-side of the strip being laid an edger plate |62 is employed at the opposite side of the paver. This edger plate is carried by a plate |63 which in turn is connected by a pair of bolts |64 with the link that takes the thrust of the cutter bar assembly. The edger plate |62 is disposed under the teeth |03 of the cutter bar assembly, these teeth thereby travelling over the top ofthe edger plate and in colse relation thereto so'that the material being' discharged from the hopper is pressed against the edger plate by the teeth as they reciprocate and a square shoulder molded in the edge of the strip. It will be understood that when one strip is being laid an edger plate |62 will be provided at each side of the paver so that both edges of the single strip will be provided with a square shoulder.

In order to heaty the teeth, oi the cutter bar and thereby facilitate their action in cutting through the column of asphalt and stone being discharged from the hopper and also to heat the material and provide a smooth ironed surface,'

the exhaust from the g-as engine 50 is conducted to the space |65 formed between the channel |0|, cutting plates |03 and spacer strips |02, the exhaust gases passing through this space and out through the open ends of this assembly. For this purpose an exhaust outlet |66 of the gas engine is connected to a ilexible conduit |61 which in turn, as best shown in Figs. 4 and 15,

opening so that the exhaust gases can pass into the space or passage |65 and thence out through the opposite open ends thereof. `By so employing the exhaust gases from the gas engine it has been found that the plates |03 of the cutter bar are maintained at a high temperature and their cutting action is facilitated and' the material being discharged heated so as to secure a more compact texture.

It will be understood that while we have shown the cutter bar as being heated by the exhaust gases from the'motor which propels the paver,

this cutter bar could be heated by the hot water withdrawn from the cooling system of the motor or it could be heated by a separate heating device, such as a separate oil heater, blow torch or the like (not shown).

The paver is required to lay surfaces having different crowns ranging from a zero curvature, such as would be employed on a banked turn in a road, to a highly crowned road. To meet the diierentf requirements in crowning a road the track for the cutter bar is adjustable as to curvature so that the cutter bar inreciprocating along this track will take a corresponding curvature and crown the road accordingly. It is one of the principal objects of this inventionV to provide a means for adjusting the curvature of the track by a single hand wheel or the like which is located on the operators platform so that the curvature can be quickly and conveniently adjusted` as conditions require, this being particularly important when the paver is merging a highly crowned road into a banked turn where no crowning is desired. To accomplish this the preferred means, best illustrated in Figs. 15-20, include a hand wheel |10 which is located Within convenient reach of the operators platform 48 andfast to a vertical shaft |1| which is journaled in a post |12. The lower end of the shaft |1| is splined, as indicated at |13, Fig. 17, this splined end of theshaft fitting into a universal joint |14. The other part of the universal joint |14 connects with a shaft |15 which is supported and journaled in a bearing provided on a bracket |16, this bracket being carried .by the angle cross bar 0. On the lower end of the shaft |15 is fixed a bevelled pinion |11 which meshesnwith a bevel gear |18. This bevel gear is fast to a. cross shaft |19, which shaft is journaled, at in tervals, in bearings |80 (see Figs. 15 and 17),-

these bearings being secured to the angle cross bar Il 0. At intervals eccentrics |8| are'mounted on the cross shaft |18 and each eccentric is housed within an eccentric housing |82, each housing forming the equivalent of an` eccentric strap, so that as the eccentrics are turned the housings |82 are raised or lowered accordingly. Each eccentric housing |82 is connected by means of a rod l| 83 with the track |04 of the cutter bar assembly so that asthe eccentric housings are moved up and down the track |04 is flexed accordingly. Preferably the upper end of each of the rods |83 is threaded into a boss |85 formed on the lower side of each eccentric housing |82 and is located in place by 'a nut |85.

In the paver shown the eccentrics |8| l.are shown as being ve in number'and spaced uni-` formly along the cutter bar assembly. The relative positions of the eccentrics are illustrated in Figs. 18 and 19k in which three ofthe eccentrics are shown, comprising the one centereccentric and the two eccentrics on the one side of the paver. It will be noted 'that the rods` |83 are of different lengths, the rods ofthe outermost eccentrics being the vshortest and the rodA of the center eccentric beingvthe longest. The eccentrics are of uniform shape and when the track |04 is disposed on a straight line, as illustrated in Fig. y19, the salient portions of the outermost eccentrics extend vertically downward, the salient portion of the center eccentricV extends horizontally and the intermediate eccentrics extend at an angle of'45. As the shaft is turned in the direction of the arrow, shown in Fig. 19, the eccentrics gradually assume the position shown in -Fig. 18, in which the outermost eccentrics are disposed at a angle; the innermost eccentric is disposed at a 45 angle projecting upwardly and the intermediate eccentrics are horizontally disposed. In this position`of the eccentrics, as

shown in Fig. 18, the track |04 is curved to provide the maximum crown. In positions of the eccentric shaft intermediate that shown in Fig.

18 and that shown in Fig. 19, a lesser crown is,

of course, obtained and it will therefore be seen that by turning the hand wheel |10 any desiredcrown can be provided in the roadway being laid inasmuch as curving the track |04 compels the teeth of the cutter bar assembly to traverse a similar curve and hence crown the road accordingly.

The hand wheel |10 is preferably provided with graduations, as indicated in Fig. 1, and a pointer |10a is stationarily mounted on the machine and is traversed by the graduations so that the crown which the cutter bar is set to provide can instantly be seen by the operator.I

An alternative form of eccentrics is shown in Fig. 20, this view being a diagrammatic view similar to Fig. 19. Inthis form the eccentrics |8|a are not of uniformI throw, the center eccentric having a relatively great throw, the outermost eccentrics having the minimum throw and the intermediate eccentrics having anintermediete-throw. The exact throw of the intermediate eccentric can be made to provide any condition of crowning which is desired and the length of the rods |83 are also adjusted to obtain the desired movement of the track. With the variable throw eccentric shown in Fig. 20 the salient portion of all of the eccentrics is directly downward when the track is in a straightline.

7Therefore upon turning the eccentric shaft in either direction the greater throw of the center eccentric will draw the trackv |04 up further atl its center than the other eccentrics and sincethe outermost eccentrics have the smallest throw the track at its opposite ends will be drawn up a relatively small amount. Therefore by turning the eccentric shaft the eccentrics |8|a will effect any desired crowning in the road up, of course to the maximum throw of the eccentrics.

' After the roadway has been deposited and cut oi to the proper grade a tamping mechanism on the paver tamps the roadway. This tamping mechanism is located immediately in rear of the cutter bar assembly and since the cutter bar assembly can be adjusted to provide any desired crown in the roadway the tamping mechanism is likewise` rendered adjustable and consistsof a plurality of small tampers, the relation of which can be adjusted to have the same curvature as the cutter bar assembly. To carry-the tamping mechanism an angle bar |90 extends ,the full width of the paver immediately in rear of the angle bar ||0.which carries the cutter bar assembly. The angle bar springs, at its opposite ends. As shown in F13. 4,

-eaciv of the -springs |9| is a compression spring and interposed between the top of the corresponding end of the angle bar |90 and av bracket |92 each of which is supported by a quick-lift device generally similar to the quick-lift device supporting the cutter bar assembly. A tie rod |93 limits the downward movement of each end of the angle bar |90 so that these tie rods limit the downward movement of each end of the angle bar |90 but each end of the angle bar |90 is free to rise against the resistance of the springs |9|.' Preferably, also, a nut |94 is provided for adjusting the tension of the spring |9|, as best shown .in Fig. 4. The angle bar |90 carries, on itsupper side, a plurality of spaced bearl ings |95 which support an adjusting shaft |96.

e so:

Vsus

This adjusting shaft is provided with a bevel gear |91 which is turned bya bevel gear |96 carried by the lower part of -a universal |99. The other part of the universal |99 is splined, as indicatedat 200 in Fig. 17, to a vertical shaft 20| which is driven by a gear 202 meshing with a gear V203 fast to theadjusting shaft |1|. The adjusting shaft is turned to adjust the crown of the cutter bar assembly and it will be seen that as this adjustment is effected a corresponding adjustment is made of the shaft |96 of the tamping mechanism. The shaftl |96 carries a series of cams 205 which are provided in the same number and spaced in a similar manner to the cams |8| of the cutter bar assembly. As with the cams of the cutter bar assembly the cams 205 operate in eccentric housings 206 so -that as the cam shaft |96 is turned the cams l raise and lower these housings.

' ranged in the same manneras the cams |6| forl crowning the cutter bar assembly, i. e., either as shown in Figs. 18 and 19, or as shown in Fig. 2'0.

Therefore, as the cam shaft |96 is turned the cams increase or decrease the crown of theA slotted flexible bar 209.

A compression spring 2|! is interposed between each of the bushings 2|6. and the underside of the corresponding head 2|1. Eachv head 2|1 is provided with a pair of upwardly extending ears 220 and between these ears a roller 22| is mounted in any suitable manner.l Each roller 22| engages the face of a star-shaped' cam wheel 222. 'I 'he projections ofthe star-shaped cam wheel are rounded so that as the star-shaped cam wheels 222 are turnedthe rods 2|6 are caused to reciprocate by reasonof the engagement of the rollers 22 with the star-shaped cam wheels, the springs 2 I 9 acting in opposition to the salient portions of the star-shaped cam wheels to elevate the tampers.l The star-shaped .cam-.wheels 222 are pro-l vided in pairs, one pair being provided for each tamper 2li.

| is mounted onthe hand wheel |16.

- Each pair of star cam wheels 222 is oonnectedby an integral sleeve 223 and each of the sleeves 223 is journaled in a bearing 224, the bearings 224 being secured to the slotted vertical web 2|| of the angle b ar 209, as best shown in Figs. 17 and 21. Each pair of connected star wheels is provided at one end with a pair of lugs 225 which are adapted to t in a pair of recesses 226 in the opposing end of the next succeeding pair of star wheels. Accordingly, the star wheels are connected to rotate in unison. In order to maintain the several star wheels in proper axial relation a rod 221 extends axially f through the center of all the star wheels, this rod being non-rotating and being connected at its ends to brackets at the ends of the angle bar |90, as best shown in Figs. 4 and v16. Power for turningthe several star wheels can be applied in any suitable manner from the gas engine 50. The several rollers 22| are also preferably continuously lubricated from a small cup 228 mounted on the upper side of each of the heads 2|1 and containing a bath of oil in which the several rollers 22| rotate. Means are also preferably provided for applying lubricant to each of the tampers 2|5 so that in addition to tamping the roadway they also apply a small amount of lubricant during this operation and serve to prevent sticking of any of the roadway material to the tampers. For this purpose a plurality of lubricant supply lines 230 connect with a common'lubricant supply (not shown) and each of the lubricant supply lines 230 extend through the vertical slotted wall 2 l2 of the ilexibie angle 209 and screws into the lower part of the corresponding bushing 2 |8. A passage 23| connects the lubricant supply line with a passage 232 provided in each of the rods 2 |6. The bottom plate 234 of each of the tampers 2|5 is provided with a plurality of'openings 235 extending vertically therethrough, as best shown in Fig. 21, andthe lubricant supply passages 232 in each rod 2|6 discharge into the interior chamber 236 of each tamper 2|5 from which it passes out through the ports or passages 235 in the bottom plate of each tamper.

It is also desirable to provides quick-lift device at each end of the tamper assembly so that the opposite ends of the whole assembly can be quickly elevated in vthe same manner as the cutter bar assembly in passing over an intercepting road or the like and can be as quickly returned tothe original adjusted position. To this end, each of the brackets |92 is connected to the main frame .of the 'carriage by rivets 236 passing through' lverticalslots 231 in the bracket'so that' the bracket is free to rise and fall. The quicklift -device supporting the tamper assembly is similar to the quick-lift device supporting the cutter bar assembly and the same reference numerals have therefore been employed' and distinguished by the sufilx a, the description of the cutter bar quick-lift applying to the tamper quicklift and hence not being repeated, the lower end of the rod |44a, corresponding to the rod |44 of the' cutter bar quick-lift being directly connected to ears 236 on the brackets |92, as best illustrated in Fig. 16.

In the form of the invention shownuiny Figs.

1-21 the crown of both the cutter bar assembly and` thetamper assembly is adjusted by turning In place of a single adjustment for the crown of these assemblies the crown of the same can be adjusted by the'modiied form of mechanism shown in Fig.- 22. In this form no cams areemployed and the curvature of the track is adjusted by a plurality of rods .246 which are which is splined as illustrated at 244 to a vertical connected at intervals to the track |04 in any suitable manner. Each of these rods 240 is threaded at its upper end and is connected to a rotatable nut 24 I, these nuts being carried by the angle I |0 and each is turned by a vertical adjusting shaft 242. Each adjusting shaft 242 is connected at its upper end to a universal 243 shaft 245. 'I'he shafts 245 extend upwardly to a point within convenient reach of the operator on his platform 48 and is suitably supported in bearings provided in a bracket 248. The upper 'end'of each adjusting rod 245 is squared, as illustrated at 241 so that by applying a wrench the operator can turn any ofthe shafts' 245 and thereby turn the corresponding nuts 24| to raise and low'er the corresponding screw rods 240. be seen that by adjusting the several shafts 245 any desired crown can be obtained in the track |04 and consequently the curvatureof the cutter bar assembly adjusted accordingly. The cutter bar assembly reciprocates on the track |04 in the same manner as in the preferred construction and therefore the same numerals have been employed to designate similar parts.

In order to facilitate adjustment of the crown ofthe cutter bar and tamper assemblies, an indicator finger 248 is mounted in any suitable manner on the upper end of each of the shafts 245, this indicator nger traveling along an index scale 248 formed in the side of the bracket 248, as best illustrated in Fig. 23. It will be seen that this scale readily permits the operator to adjust each of the shafts 245 so as to obtain any desired crown in the road. l

Each of the shafts 245 carries a gear wheel 250 I which meshes with a similar gear wheel 25|, this gear wheel 25| being fast to a shaft 252, as best illustrated in Fig. 24. The 1ower end of the shaft 252 is splined (as at 253, Fig. 22), to one part of a universal-254, this universal driving a shaft 255 which is pinned to a nut 255. The nuts 255 are exactly similar to the nuts 24| which adjust the curvature of the track |04 andl are threaded to rods 251 the lower ends of which are suitably connected to the lower web of the. flexible angle bar 209. This angle bar 208 is the same as that shown in the preferred form of the invention illustrated in Figs. 1-21 and carries an identical tamping mechanism. Therefore the adjustment of the crown of the cutter bar assembly (by adjusting the curvature of the track |04) eifects a similar adjustment of the slotted angle bar 208 and consequently adjusts the crown of the` tamper assembly.

In order to protect the

rollers

34 and 35 which support the rear end of the paver against picking up pieces of the freshly laid roadway each roller is preferably lubricated by alubricating device which is preferably constructed as follows:

Above each

roller

34 and 35 is mounted a small wooden roller 250. Each of the rollers 250 is provided with bearings 25| at itsopposite ends which turn on a lubricant supply pipe 282. The lubricant supply pipe is in turn mountedin alpair of links 253 each of which is pivoted at its outer end to a bracket 254 on the main frame. of the wooden rollers 250 is covered with felt 255 and each felt covered roller is held in engagement with the corresponding main roller of the paver by a spring 28,5. which connects at one end with an arm 251 projecting upwardly from a cross bar 258, this cross'bar connecting the opposite links 253 for each roller. The other end of the spring 255 connects vwith an adjusting sci-ew eye It will therefore Each 259 which `is adjusted by means of a wing nut 210 which bears against any suitable part of the main frame. Each of the lubricant vpipes l252 is fed froma lubricant supply line 21| which is formed with a plurality of convolutions 212, as illustrated in Fig. 1, to render it ilexible and permit free movement of the roller 250. Each of these lubricant supply lines 21| connects to a commonl lubricant supply tank 213, as illustrated in Figs. 1 and 4. Within the roller 250the lubricant pipe 252 is provided with a pair of discharge orifices 214 at its center and these orifices discharge lubricant into the center of the wooden' axial bore to a plurality of radial passages 215.

By this means the felt covering 265 is kept constantly saturated with lubricant and from this covering the lubricant is transferred lto the surface of the

main roller

34 or 35, as the paver moves along. l

As a final operation of the paver it is frequently desirable to entirely scarify thatportion of the strip laid over which the rollers have passed. Thus, as the

rollers

34 and 35 traverse the freshly laid strip they roll two stripes in the strip. Unless the entire strip is rolled immediately after the paver is passed these stripes may persistin the nished roadway and while the quality vof the roadway is not in any way impaired the stripes Each of the scarifying devices includes a bottom plate 280 to which are removably secured a plurality of scarifying .teeth 28| which project downwardly therefrom, as best illustrated in Figs. 7 and 10. This vertical vplate is connected at its opposite ends to vertical angle bars 282 which are suitably braced by diagonals 283. The back of each of the vertical angle bars 282 isnotched or serrated to provide a plurality of rearwardly facing teeth 284 and these teeth engage similar' forwardly facing teeth 285 provided in vertical hanger bars 285. The

vertical bars

282 and 285 are secured together by through bolts 281. The

upper end of each of the hanger bars 285 is conf angle bars 282 upwardly or ldownwardly relative to the hanger bars 285, the depth of penetration of the scarifying teeth can be adjusted as may be It will be seen that desired. The vpurpose of the hinge pivots 288 is to permit the scarier frame to be moved from the operative position shown by full lines shown in Figs. 4 and 7 to the inoperative position shown i by dotted lines in Fig. 4. When the scarifier is in its operative position the rearward thrust against the teeth in traveling along the roadway is preferably taken by a flexible connecting member, such as the cable 290 shown in Fig. 4, which connects the bottom plate 280 of the scarifier with brackets 29| projecting downwardly from the main bearing brackets 35. The yscarifier in rear of each

roller

34 and 35 is connected, as above described, to the movable angle bar 288. This anglebar`is provided at its opposite ends with a'pair of hangers 282, each of which hanger brackets 282 carries a pair of opposing rollers 253 and 294. Each'roller 253 rides on the lower flange 295 of the cross channel 92 which forms a part of the main frame of the paver and the other' roller 29d rides along the back of this channel 32. It will therefore be seen that the angie bar 2839 is ai compelled to travel along the channel 92. This angle bar 289 is reciprocated by means of a crank wheel 296 which is driven in any suitable manner by the gas engine 50 and carries a crank pin 291 driving a link 293, the other end of which connects with a bracket 299 which is secured to the angle bar 289 of the scarifying apparatus. To guide the bracket 299m its movement a guide bracket 300 is fixed to the rear side of the frame channel 32 and embraces the crank wheel 290 and the bracket 299. It will therefore be seen that as which the rollers have not passed. The strip finl ished by the paver is therefore of uniform surface texture and in condition for nishing by the usual steam roller or the like.

Operation In the operation of the paver, assuming that a single strip is initially to be laid the paver can be started by first laying a suicient amount of paving material of the desired height and thickness to receive and support the rear rollers @f3 and 35 of the paver, the front or steering wheels 51, of the paver riding alongthe surface which is to be paved. The operator thereupon adjusts the hand wheels 39 so as to adjust the height of the cutter bar at each side of the paver so as 4.0 to continue the probable elevation of the strip. Upon turning either hand wheel HB9 to achieve this' adjustment the slide Mii (see Fig. 14) is adjusted vertically which elevates or depresses ,the hanger rod lil so as to raise or lower the corresponding end of the bar ||0 which carries the track |05 of the reciprocating cutter bar.

ThereafterY the tension'of the springs I9! (Fig.

4) which exert a downward pressure on the tamper assembly can be adjusted to secure the desired tamping action. Further, if the strip of A material being laid is tol be much thicker at one side than at the other, the Ill-shaped washers 83 (see Fig. 11) which support either or both front corners of the4 main frame: of the carriage on the

front steering wheels

31 and 38 can be removed and the corner or corners elevated to provide the desired list before the U-shaped washers 83 are reinserted. It will be understood that minor variations in the thickness of the strip being laid can be obtained by adjustment of the hand wheels |39 of the cutter bar assembly.'`

The operator thenadjusts the level indicator (Fig. 3) so that the bubble is in the center of the bubble level |58. The operator then brings the scariiier down to the operative position shown by full lines in Fig. 4 and secures the tension cable 290 in position. The operator also applies the edger plates |62 to both sides of the paver by attaching each to the bars and adjusts these edger plates so that the teeth |09 of the cutter bar just clear the top of the edger plates, as best shown in Fig. 4.

The operator can then adjust the crown of the cutter bar assembly and also the crown of the aardgas tamper assembly. To do this in the form of the invention shown in Figs. l2l, the operator urns the wheel am (Fig. 15) which rotatestn am 'shaft' |19 (Fig. 17) which rotates the .c v v, 8i so as to elevate or depress the dierent portions 5 of the track |021 to provide the desired curvature thereof, the cams being set at different angles (Fig. 18) or having a variable throw (Fig. 20) so as to secure a uniform curvature of the track |04 in all positions of adjustment. Since the 10 cutter bar travels along this track |04 it will be seen that the cutter bar takes its curvature and hence grades the strip being laid to have a similar crown.

Turning the shaft |1| from the wheel |10 (Fig. 15 l'lthrough the

gears

203 and 202 also turns the cam shaft |96 of the tamper mechanism and these cams, which are formed and arranged similar tothe cams |8| of the cutter bar assembly, ad- 4 just the curvature of the slotted angle bar 209 20 which carries the tampers 2I5. Therefore the, curvature of the tamper bar assembly will be adjusted to have the same curvature as the cutter bar assembly.

The operator thereupon applies power to the 26y shaft 92 so as to operate the pinions 89 and, through the racks 88, draw the power closure gate 81 into its forward open position. The material in the hopper 40 is then free to pass out through the opening 81 in the bottom, the effec- 80 tive width. .of this opening being determined by the number of plates 93 which are laid in the bottom of the hopper, this depending, of course, upon the width of stripwhich is desired to be laid.

The truck of paving material is then backed up between the front steering wheels 31 and B of the paver until its rear wheels engage the rollers 39 (Fig. 1). 'The operator of the truck thereupon elevates the body so that an amount 4@ of paving material is deposited into the hopper 30. The operator thereupon applies power to the shaft 53 which Irotates the shaft i and through the chain 61 drives the raker bar shaft B0 so as to start rotation of the raker bar 59 and spread 45 the material being dumped into the hopper uniformly over its entire width. Depending upon the consistency of the material to be laid the angularity of the blades carried by the raker bar shaft are adjusted to obtain the desired spread- 50 ing action of the raker bar. The operator then applies power to the crank wheel (not shown) which reciprocates the link |08 (Fig. 15) this in turn reciprocating the cutter bar assembly along the track |04. The operator also applies power 55 to the star-shaped cam wheels (Fig. 17) which in their rotation move the tampers 2|5 up and down. The operator also applies power to the crank wheel 296 (Fig. 7) which reciprocates the traveling angle bar 289 which carries the scaria0 fiersin back of the

rollers

34 and 35. It will also be understood that the operator turns on the lubricant supply lines 21| and 230 (Figs. 26 and 17, respectively) so as to supply lubricant to the wooden rollers 260 (Fig. 26) which apply the o5 lubricant to the

rear rollers

34 and 35 and to the tampers 2|5 (Fig. 17).-

The operator thereupon applies power to the

rear rollers

34 and 35 and commences paving.

As the paver moves along, the material in the 70 hopper 60 drops through the slot 41 as a( column and the teeth |03 of the cutter bar cut into this column and permit of the deposit of only enough material to form a strip which is graded and crowned by the cutter bar as it reciprocates along 75 its track |04. 'I'he reciprocation of the cutter bar works and smooths the strip being laid and further forces the material up against the edger plates |62 so as to mold the sides of the strip to have clean square shoulders. Further, the exhaust from the .gas engine Il is conducted through the exible conduit |81 (Fig. 15) to the interior passage |65 of the cutter bar |00 (Fig.

17). This heats the cutter bar |00 so as to assist it in cutting through the column of material being discharged by the hopper and also to iron the surface of the'strip being laid. y

' As the paver moves along, its front rollers 84 g i "V (Fig. l) push the truck along so that the depositing of the material into the hopper proceeds along with the movement of thepaver in depositing the layer of paving material.

The front wheels 31 and 88 of the paver ride l on the relatively 'rough subgrade and, of course,

lthe front end of the .paver necessarily rises and drops in accordance with irregularities inthe subgrade. However, the rise and drop of the front end ofthe paver has a relatively small effect on the cutter bar |00 because this cutter bar is located near the rollers M and 35 which ride upon the strip of material being laid. Hence, even though the subgrade is relatively rough the strip of material laid will be quitesmooth. Further, it is thepractice to lay the material in two layers. Thus, after the roadway has been completely surfaced with the rst layer the second layer is laid. It'will be seen that the second layer will be extremely smooth and free from irregularities even though the subgrade was extremely rough because such irregularities would be only slightly reproduced in the first layer of material and a almost completely eliminated when the second layer of material is laid over the first.

As the paver movesalong the operator watches the bubble level lss and 1r this ivei indicates that the paver has taken an undesired list the operator adjusts the corresponding hand wheel '|39 (Fig. 14) so as to elevate or depress the corresponding end of the cutter bar |00 so as to bring the strip back to the proper transverse angle and hence bring the paver back to the desired lateral level in which position the bubble in the bubble indicator |58 will assume a central position.

Also, if in paving, the operator approaches a curve in the-road he simultaneouslyslacks off on the hand wheel |10 so as .to atten the crown of the cutter bar |00 and the series of tampers and also adjusts one or the other of the hand i over this strip the stripes which are formed by the rollers in the strip are eradicated by'the teeth 28| (Fig. 7) of the scariers which are reciprocated back and forth across the stripes by the

crank wheel

28,6.

When an4 intersecting road is encountered the operator applies power to the shaft 82 (Fig. 4) so as to close the 'power cuto closure 81. This holds the material in the hopper 40 while the paver is driven across the assumed intersecting the entire cutter bar assembly and edger plates |82 bythe quick-lift device shown in Figs. 13 and 14. lo operate each quick-lift device the opera- 's tor kicks out the locking plates |32, steps upon the treadle |20 so as to release the tooth |20 from the locking notch |3| and seizes the lever |28 together with the small lgripping lever |30 and draws the two rearwardly. This causes the dog |21 to engage the teeth of the ratchet ||9 and rotate the ratchet wheel. He then steps off the treadle |24 which permits the tooth |20 to act asl a holding dog in the continued reciprocation oi' the hand lever |26. 'I'he turning of the ratchet wheel ||9 through this reciprocation of the hand wheel lever |28 turns the shaft ||5, thereby lifting the cranks I |1 and elevating both brackets ||3 which carry the adjusting mechanismv for the opposite ends of the cutter bar assembly. Hence it will be seen that the cutter bar is quickly lifted so as not to be injured in traversing the assumed intersecting road and it 'I will also be seen that the edger plates |62 are likewise elevated since. they are carried on the same bar (Fig. 4) which is secured toand takes the rearward thrust of the cutter bar. In a like manner the operator operates the quicklift for the tamper assembly in the same manner as the quick-lift for the cutter bar assembly.

When the intersecting road has been passed4 along the edge of the strip already laid isa'emoved and the bracket |50 (Fig. 5) of the dollyis substituted for this edger plate. This dolly has rollers which are arranged to ride on the edge of the strip already laid and-the elevation of the cutter bar assembly relative to those rollers' is adjusted (by the holding bolts |53) so that the cutter bar assembly works into the surface of the strip already laid and hence provides a seamless joint. It will be seen that by laying the first strip with extreme care the dolly shown in Fig. 5'

permits this strip to be used as a gage for the strip being laid against the rst strip, this dolly supporting the corresponding end of the cutter bar assembly. The operator thereupon adjusts the hand wheel |38 at the opposite side of the paver so as to provide the desired thickness of pavement at that side and also adjusts the level indicator |58 so that the bubble of this indicator is in the center as long as this desired list of the paver is maintained. If the paver, in paving, departs from this desired list itwill immediately show in the bubble indicator |58 and the operator can adjust the said vouter hand wheel |39 so as to elevate or depress theouter end of the cutter bar assembly up or down to restore the paver .to the desired position and the bubble in the paved, a. cutter bar holder carried by said carriage, a reciprocating cutter bar carried by said holder, means for depositing the paving material on the surface to be paved in advance of said cutter bar, a bracket carried by said carriage, means adjustably connecting said bracket and cutter bar holder and permitting of adjustably raising and lowering said cutter bar holder relative to said bracket and an independent quick lift means connecting said bracket with said carriage and comprising a crank arm mounted on said carriage, means connecting the outer end of said crank arm with said bracket and means justably connecting said bracket and cutter bar f holder and permitting of adjustably raising and lowering said cutter bar holder relative to said bracket and quick lift means connecting said .bracket with said carriage and comprising arotatable shaft mounted on said carriage, Ya crank arm on said shaft, means connecting the outer end of said crank arm with said bracket, a ratchet wheel on said shaft and a lever, dog and detent means mounted on said carriage and co acting with said. ratchet wheel to rotate said crank arm and quickly raise or lower said bracket thereby permitting of quickly elevating and restoring said cutter bar without losing its adjust/ ment.

8. In a paver of the character described, a. carriage adapted to traverse the surface to be paved, an elongated cutterpbar holder carried by said carriage, a reciprocating cutter bar carried by said holder and arranged longitudinally thereof, means for depositing the paving material on the surface to be paved in advance of said cutter bar, lifting means carried by said carriage and extending parallel with said cutter bar holder to provide a quick lift mechanism for said cutter bar, independent means adjustably connecting each end of said cutter bar holder with the corresponding end of said lifting means to permit of independently adjusting the elevation of said cutter bar holder relative to said lifting means and means for actuating said lifting means to simultaneously elevate both ends of said cutter bar holder.

9. In a paver of the character described, a carriage adapted to traverse the surface to be paved, an elongated cutter baroperatively connected to said carriage and extending transversely of the direction of movement of said carriage,` and arranged to level paving material deposited on the surface to be paved, means for supporting one end of said cutter b ar on the surf-ace to be paved and means for supporting the other end of said cutter bar on a prelaid surface parallel` to which the strip being laid is being deposited thereby to insure the formation of a smooth surface by said cutter bar gaged from said prelaid surface said last supporting means comprising a dolly having a supporting roller and removably connected with the corresponding end of said cutter bar.

10.,A In a paver of the character described, a carriage adapted to traverse the surface tov be paved, an elongated cutter bar operatively connected to said carriage and extending transversely of the direction of movementof said carriage and ar-v ranged to level paving material -deposited on the surface to be paved, means for supporting one end of said cutter bar on the surface to be paved and means for supporting the other end of said.

cutter bar on a'prelaid surface parallel to. which the strip being laid is being deposited thereby to insure the formation of a smooth surface gaged from said prelaid surface, said last supporting means comprising a dolly having a supporting roller and removably connected with the corresponding end of the cutterbar.

11.- In a paver of the character described, a carriage adapted to traverse the surface to be paved, means for depositing the paving material o n the surface to bepaved, a. cutter bar holder operatively associated with and carried valong with said carriage, an elongated, lengthwise reciprocating, cutter bar carried by said cutter bar holder and arranged to grade the deposited material,

= means moving with said carriage for supporting one end of said cutter .bar holderto follow, in general, the undulations of the lsurface to be paved and means for supporting the other end of said cutter bar holder on a prelaid surface parallel, with which the strip being laid is being de posited' thereby to insure the formation ofv a smooth surface by said cutter bar gaged from said prelaid surface, said last supporting means comprising a dolly and means for attaching said dolly to the corresponding end of said cutter bar holder.

12. In a paver o-f the character described, a carriage adapted to traverse the surface to .be paved,

an elongated cutter bar operatively connected to said carriage and extending transversely of the direction of movement ofsaid carriage and arranged to level the paving materialdeposited on thesurface to be paved, means for reciprocating said cutter bar transversely of the line of movement of said carriage, means on said carriage for adjusting the lelevation of said cutter bar relative to the surface to be paved, an internal combustion engine for propelling said carriage and means for internally heating said cutter bar.

13. In a paver of the character described, a carriage adapted to traverse the surface to be paved, an elongated cutter bar operatively connected to said carriage and extending transversely of the direction of movement of said carriage and arranged to level the paving material deposited on the surface to be paved, an internal combustion engine for propelling said carriage, means for internally heating said cutter bar through heat derived from the combustion of the fuel in said engine and means for reciprocating said cutter bar through power derived from said engine.

14. In a paver of the character described, a car.-v

riage adapted to traverse the surface to be paved, an elongated cutter bar operatively connected with said carriage and extending 'transversely of the direction of movement ofsaid carriage, means for reciprocating said cutter bar, said cutter bar comprising an upper elongated plate, side spacer bars depending from the longitudinal edges of said plate, sections secured across the bottoms of said spacer bars and projecting forwardly to form teeth which level the paving material deposited on the surface to be paved and means in the space between said upper plate, spacer bars and sections for heatingsaid cutter bar.

15. In a paver of the character described, a car-