US2245426A - Paving machine - Google Patents

Description

10 Sheets-Sheet 1 Il H 1 T l June 1G, 1941*. R. D. BAKER PAVING MACHINEy Filed Dec. 19, 1938 June 10, 1941.

R. D. BAKER PAVING MACHINE 10 Sheets-Sheet 2 Filed Dec. 19, 1938 I June 10,1941't R. D. BAKER 2,245,426

PAVING MACHINE Filed Deo. 19, 1958 1o sheets-sheet s ,an zza MW r"A TTORNE Y June 10, 194. R. Q BAKER l2,245,426

PAVING MACHINE Filed Decy 19, 1938 l0 Sheets-Sheet 4 [NI/ENTOR l m n N www (MQ lTOR/vzw Jne l0, 1941. R. D. BAKE 2,245,426`

PAVING MACHINE Filed Dec. 19, 1938 10 Sheets-Sheet 5 NVENTOR BY d/ZH 'n A T NEY June 1 0, 1,941. R. DfBAKr-:R 2,245.426

PAVING \MACHINE Filed Dec. 15af 195s 1o sheets-sheet e June 1o, 1941. A R. b. BAKER 2,245,426

PAVING' MACHINE Filed Dec. 19, 1938 l0 SheetshShefL '7 1N VIENTO/l BY 'aer Zder:

' AT RNEY June 10,1941. R. D. BAKER PAVING MACHINE ,lO Sheets-Sheet 8 Filed Deo. 19, 1938 /NVENTQR I A ORNE Y SNN . mk NWN NNN N mw NN -June1o,1941. l RnB/mm y 2,245,426

PAVING MACHINE Filed Dec. 19, 1958 10 Sheets-Sheet 9 v 48 /N VENTO/e E E. Be/Z ,Edina v Elf 1 A TTORNE Y `Fune l0, 1941 R. D. BAKER PAVI'NG MACHINE l0 Sheets-Sheet 10 Filed Dec. 19, 1938 3W KN. NN

[NVENTO iwf-ri l I dllfcn W Patented June 10, 1941 UNETED STTES PATENT OFFICE PAVING Robert D. Baker, Birmingham, Mich.

Application December 19, 1938, Serial No. 246,589

14 Claims.

This invention relates to paving machines and in particular to pavers adapted to lay concrete or asphalt pavements.

One object of the invention is to provide a paver adapted to spread, compact and tamp concrete or asphalt mixes to their maximum degree of density whereby to provide a concrete or asphalt pavement having substantially no voids therein.

Another object of the invention is to provide a paver adapted to spread low slump concrete mixes and compact the mixes after spreading to a sufficient degree of density to assure maximum strength of the finished roadway.

Another object of the invention is to provide a paver adapted to lay concrete or asphalt mixes to a desired line and grade Without the use of pre-laid road forms or .other trackage.

Another object of the invention is to provide a paver adapted to spread low slump concrete mixes and compact the same to a density which will enable the traction members of .the machine to run on the finished concrete surface immediately after compaction withoutv any material displacement thereof.

AAnother object of the invention is Vto provide a paver adapted to spread concrete or asphalt mixes between forms carried by the said paver, compact the mix to a desired grade and then tamp the said compacted mix to its maximum possible density whereby to admit of the traction members of the said paving machine traveling over the completed pavement prior to the setting of the concrete or hardening of the asphalt without damag-e thereto or material displacement thereof.

Another object of the invention is to provide a paving machine adapted to spread concrete or asphalt mixes to a depth considerably deeper than the finished pavement to be laid thereby, and then compact the concrete or asphalt mix by means of ycompaction members having va combined generally elliptical and rocking movement in a path parallel to the direction of travel of the said paving machine which both compacts and smooths the material fed thereunder by the spreading mechanism to the desired depth and to amaximum density.

Another object of the invention is to provide a p-aving machine adapted to spread concrete 'or asphalt mixes to a depth considerably deeper than the iinished pavement to be laid thereby, and then compact sufficient of the said spread concrete or asphalt mix to assure a pavement of maximum density by means of compaction members having a combined generally elliptical and rocking movement which advances surplus material thereahead.

Another object of the invention is to provide a paver adapted to spread concrete or asphalt mixes to a thickness greater than the depth of the finished pavement being laid thereby, compact the said mix after spreading with a rapid combined compressing and smoothing action into a pavement of the desired thickness, and then tamp the said compacted pavement by a rapid treadle action, all progressively as the paver moves forward over the surface to be paved thereby. v

Other objects of the invention will become apparent by reference tothe following detailed description taken in connection with the accompanying drawings, in which:

Fig. 1 is a more or less diagrammatic plan view of a paving machine embodying the in- Vention.

Fig. 2 is ran enlarged fragmentary more or less diagrammatic sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged side elevational view of the novel paver.

Fig. 4 is a rear elevational view of the machine. v

Fig. 5 is a fragmentary plan View of the Inachine with the compactor-tamper mechanism omitted. t

Fig. 6 is a cross sectional view of the machine showing the compactor-tamper assem-bly in rear elevation.

Fig. 7 is a detailed sectional View taken on th line 'I-T of Fig. 6 showing the tamper quick-lift operating lever ratchet.

Fig. 8 is a detailed view in perspective showing the quick-lift suspension of the tamper members.

Fig. 9 is an enlarged partial plan view of the compactor-tamper assembly.

Fig. 10 is a vertical sectional View taken on the line Illl0 of Fig. 9.

Fig. 11 is an enlarged fragmentary side eleva tional view of the machine showing the side forms carried thereby and the means preferably employed for resiliently holding the same to the vdesired adjusted position.

Fig. 12 is a vertical sectional view taken on the line |2-l2 of Fig. 11.

Fig. 13 is a detailed vertical sectional view showing the compactor-tamper mechanism employed.

Fig. 14 is a detailed vertical sectional View taken on the line lll-lt of Fig. 5 showing the special tamper preferably employed adjacent the side forms to assure maximum density along the edge of any strip of pavement laid by the machine.

Fig. 15 is a diagrammatic view of the means employed to drive the various elements of the machine.

Fig. 16 is a diagrammatic View sho-wing the preferred movement of the compaction and tamper members.

Fig. 17 is a diagrammatic view showing the path of travel oi the base of the heel of a compaction member.

Fig. 18 is a diagrammatic view showing-the path of travel of the toe of a `compaction member. K

Fig. le is a diagrammatic view showing the path ci travel of the toe of a tamper member.

Fig. 20 is a fragmentary sectional View show- -ing how the vcompaction and tamper members iay be heated when the paving machine is used the spread, compact and tamp asphalt mixes.

Fig. .2l is a side elevational View of the novel paver equipped for use in laying asphalt mixes.

Fig. 22 is a fragmentary plan View showing the generator mounting and drive preferably employed to heat the compaction and tamper members when the paver is used to lay asphalt mixes.

The embodiment of the machine disclosed in Figs. l to 19 inclusive adapted for use in laying concrete pavement and the modification thereof shown in Figs. 20 to 22 inclusive for use in laying asphalt mixes each carry their own forms,

however, although not shown `and described in detail, it is contemplated that the novel compacter-tamper mechanism disclosed and claimed herein may be used in a like and similar manner in machines for laying either concrete or asphalt pavement which are constructed to run on the usual pre-set forms as heretofore .common practice.

In the following detailed description of the illustrative embodiments of the invention shown in the drawings, like reference numerals and letters rrefer to like and corresponding parts throughout the several views.

GENERAL DESCRIPTION A brief general description will be given rst followed by a more detailed description of the construction and operation of the machines. The novel paver disclosed in Figs. 1 to 19 inclusive comprises a main frame Z5 preferably supported for mobility on front Wheels 26 and rear caterpillar type endless treads 2. The saidr main frame 25 has a sub-frame 28 adjustably suspended therefrom which carries compaction members 29 and tampers Sil disposed rearwardly with respect to a hopper 3i supported on the main frame 25 from which concrete or asphalt mixes are fed by gravity after agitation and lateral distribution by suitable conveying type agitator blades 32. The said compaction members 29 are preferably mounted and powered to compact and smooth mixes spread thereahead by a rapid combined elliptical and rocking movement which has been found to produce an extremely dense finished pavement having substantially no voids therein. The said compaction members 29 are so formed as to advance surplus material fed thereto thereahead during their combined elliptical and rocking movement, only accepting for compacting sufficient material to assure maximum density of the pavement being laid thereby. The said tampers 3S follow the compaction members 2S and provide a finished tamp by a rapid treadle action.

Side forms .33 are preparably carried by the machine along both sides thereof and are resiliently mounted on the main frame 25 in such a manner as to float on the fine-graded terrain or seminished surface upon which a concrete or asphalt pavement is laid by the machine. A special tamper ii is provided at each side of the hopper 3E disposed adjacent the side forms 33 and located just ahead of the compaction members 2%. The said special tampers 34 compact the edges of strips of' pavement during the laying thereof by the machine.

The sub-frame 28 is suspended from the main frameiron suitable means for raising, lowering and tilting the same with respect to the main frame f5. The heels of the tampers 3i! are `mounted von quick-lift .means particularly to admit of being lifted at the beginningof the laying of a strip of pavement and being lowered when the rear caterpillar traction members V2'! rise to the finished grade as the machine advances onto freshly laid pavement, however, the quick-lift means may be :employed at other times during the operationV of the machine to raise and lower the heels of the tampers 3G as may be required or found desirable.

The novel paver disclosed in Figs. 20 to 22 inclusive is similar in every respect to the paver disclosed in Figs. lto 19 inclusive with the exception that the side forms 33@ thereof are short- .ened and heating elements Vhave been provided onthe compaction members 2E: and the tampers ".il. n generator F35 has been added to supply electric current to 'the Vcompaction member and .tamper heatingelements. The special tampers iid lhave also been omitted.

'The paver disclosed in Figs. 1 to 19 inclusive ispreferably used for laying concrete mixes 4and -is readily changed over by the minor detailed changes Aalcove mentioned and as disclosed in Figs. 20 to 22 inclusive to a paver adapted to lay asphalt mixes. Both embodiments of the invention utilize .the same novel Compactortamper mechanism which has been found to compact. andY tamp mixes Vspread thereahead into an Aextremely .dense finished pavement `having a minimum of voids therein.

A detailed description of the construction and operation of thenovel pavers will now be given.

.Mainframe and mobile means The main frame 25 is composed of a pair of longitudinally disposed laterally spaced Ypreferably box shaped members 40 and forward, central. and rear :main cross members 4|, 42 and 43 respectively spanning transversely between the said longitudinal frame members E9. The rear of the said main frame 25 is supported on longitudinally disposed outer bolsters #.4 depending from .therear of the said box shaped longitudinal members Ml and on longitudinally disposed inner bolsters l5 secured to the bottom of `the central cross member 42 and the rear cross member 43. Each pair of bolsteds comprising one outer .bolster ifi and one inner bolster 4d is pivotally supported on a caterpillar tread axle d which in turn `is mounted cn a pair of side rails '4l of one of the caterpillar endless treads 27. Front and rear caterpillar tread sprocket shafts 43 and 49 carrying caterpillar Atread sprockets V5!! are journaled in the usual take-up type bearings bolted or otherwise secured to the said side rails 41. Although not shown, the usual caterpillar tread idlers may bev employed to prevent the lower run of the caterpillar endless treads 21 from deflecting between the caterpillar tread sprockets 58. Each caterpillar endless tread 21 has a drive sprocket 52 keyed to the rear tread sprocket shaft 49 to admit of driving the same by means of a chain drive, clutch and transmission means as hereinafter described in detail.

The front end of the side longitudinally disposed main frame members 48 extends a considerable distance forward from the forward cross member My and are each supported on a front wheel 26 preferably having a tire 53 thereon. Each front wheel is rotatably mounted on an axle 54 fixed through the lower bifurcated end 55 of a vertically disposed spindle 53 journaled through a suitable bracket 51.

said spindles 56 by such means as a conveniently located steering wheel 58 mounted on a steering column 59 connected to worn and pinion gearing 6|] adapted to turn a transversely disposed steering shaft 6| on the outer ends of which arcuately movable levers 62 and 53 are keyed in diametrically opposed relationship to each other; the said arcuately movable levers 62 and 63 impart opposed reciprocating motion to a pair of steering rods 64 linked at their rear ends to the said arcuate levers 32 and 63 and at their front ends to steering arms 85 keyed to the upper ends of the said spindles 55, all as best shown in Figs. l, 3, 4 and 5.

At the side of the machine nearest the steering wheel 58 a pair of short secondary longitudinal frame members 68 are provided to support the outer end of the compactor-tamper drive shaft B1. Another pair of secondary longitudinal frame members 68 located near the center of Athe machine supports the caterpillar drive transmission 69 and caterpillar drive main clutch 10. And still another pair of secondary longitudinal frame members 1| located at the side of the machine opposite the steering wheel 58 supports the engine 12, main clutch 13 and main transmission 14. All the said secondary longitudinal frame members 5G, 88 and 1| are supported on and rigidly secured to members 4|, 42 and 43.

- An operators platform is-preferably welded to the top of the main frame in the region of the steering wheel 5S and other operating controls.

Hopper and agitator to lay.

A transversely disposed agitator shaft 80 is journaled on suitable bearings 8| secured to the sides of the hopper 3| a short distance above the open bottom thereof. One end of the said agitator shaft 88 is extended through one of its supporting bearings 8| and has a drive sprocket 82 keyed thereon as shown in Fig. 5. The said agitator shaft 80 is rotated rather slowly by a chain Steering of the paver is accomplished by turning of the drive running over the sprocket 82 as hereinafter described in detail. v

The said agitator shaft 88 Vhasa plurality of spaced conveying type agitator blades 32 secured thereon radially extending therefrom. The said agitator blades are pitched as shown in Fig.:5 to distribute concrete or asphalt mixes across the entire width of the hopper 3| is indicated by the arrows 83 in Fig. 1. The said concrete or asphalt mixes are dumped'into the hopper 3| at about the transverse center thereof from dump trucks or the like which are preferably employed to supply the concrete or asphalt mixes to the paver during the operation thereof.

Side forms Which pavement being laid by the paver may be compacted without adhering thereto. 'I'he wide lower ange 85 of each side form 33 rides on the rough grade indicated by the dot and dash line 81 throughout the drawings. The depth ofthe side forms 33 is preferably greater than the maximum depth of the thickest pavement which may be laid by the paver. Also, the said side forms 33 are suciently deep to admit of the top thereof to extend above the lower edge 3H! of the hopper 3| when the said side forms are adjusted to their lowest position.

Each side form 33 is provided with at least two vertically disposed offset preferably channel shaped slides 88 preferably welded thereto which are telescopingly retained by vertically disposed keeper members 89 between pairs of vertically disposed guides 98 preferably welded to the outside of a longitudinally disposed box shaped main frame member 49 as best shown in Figs. 9, 1,1 and 12. The said keepers 89 are preferably secured to the guides 98 by means of machine screWs 9|. The fit between the offset slides 88 of each side form 33 and the main frame member 48, keepers 89 and guides 90 is such as will permit the side form 33 to follow the'rough grade 81 as the paver advances thereover during its operation and yet maintain the side form 33 in its desired and proper alignment. Although but twor sets of offset slides 88, keepers 89 and guides 98 are shown in the drawings for each side form 33, it is obvious that three or four sets may be used if found desirable and advantageous Where extremely long side forms 33 are employed.

Referring now particularly to Figs. 3, 4, 5, 11 and 12, each side form 33 is carried by the longitudinal box shaped main frame member 48 thereabove and is constantly urged against the rough grade 81 by a spring loaded side form supporting plunger 92 telescopingly mounted through a sleeve 93 disposed through the said box shaped frame member 48 and secured thereto by suitable machine screws 94. Each side form 33 is provided with a xed pivot pin 95 extending outwardly therefrom which is journaled through the depending end 96 of the said plunger 92, the said pivotal connection between the side form 33 and its supporting plunger 92 being employed to `minimize the possibility of the plunger 92 binding in its sleeve mounting 93 due to any play that may exist or develop between the slides 8|! vof the side form 33 and the guides Si) on the main longitudinal frame member fil between which the said slides are telescoped.

Each side form 33 is adapted to be raised or lowered to the desired working position by means of an L-shaped lever 97 which is fulcrumed on a suitable pivot pin 9S extending through the upper .end of a lever supporting bracket S9 secured to the top of a main longitudinal box shaped frame member d3 as best shown in Fig. 11. 'Ihe lever 91 1s fixed in any desired position by means of a set pin |33 which is telescoped through a suitable aperture in the said lever Sl and through one of the positioning apertures IBI in an arcuately shaped stay arm |32 cantilevered from the said lever supporting bracket 99. The extreme end |63 of the lever 37 is preferably bifurcated for receiving the side form supporting plunger 32 therebetween. The said side form -plunger 32 and the side form 33 carried thereby is preferably suspended from the top of the said bifurcated end |33 of the lever 97 by means of a suitable pin |36 fixed through the upper end of the said plunger 32 disposed normal to the bifurcated end |33 of the said lever Sl. The raising and lowering of the bifurcated end |33 of the said L-shaped lever 3l' raises and lowers the side form 33 suspended therefrom to the rough grade 81.

To prevent the paver from riding on its side forms 33 and losing traction, and to compensate for any reasonable variation in the rough grade 81, the side form supporting plungers 92 are spring loaded to cause the side forms 33 carried thereby to follow any irregularities in the grade on which the paver is operated. Each of the said side form supporting plungers 92 is provided with a vertically disposed slot therethrough disposed just below and normal to the bifurcated end |03 of the lever 91 as best shown in Figs. 11 and 12. A compression spring |06 is telescoped over the said plunger 32 with annular washers |01 at each end thereof. A lower fixed pin |38 through the said plunger 32 disposed below the lower annular washer Hl anchors the lower end -of the said compression spring |95 in a suitable location along the said plunger 32 and the upper Washer 07 disposed rmly against an upper movable pin |39 extending through the said vertical slot |35 in the said plunger 92 resiliently maintains the said movable pin H39 against the bottom of the bifurcated end |33 of the lever 3l. The reaction of the said movable pin |39 against the bottom of the bifurcated end |63 of the lever 91 constantly but yieldably urges the side forms 33 to their lowest adjusted position.

When the side forms 33 ride over high spots in the rough grade 8l on which pavement is being laid by the paver, the said compression springs |56 permit the said forms to yield to accommodate themselves to reasonable irregularities in the said rough grade 3i. When lowering the side forms to the rough grade Sl, it is well to compress the springs |33 partially by adjusting the levers il? to a position lower than normally necessary whereby to urge the said side forms 33 firmly yet resiliently against the rough grade 3l over which a pavement is being laid to prevent any of the concrete or asphalt mix from being forced under the side forms 33 by the force of the compactor-tamper mechanism employed.

Each side form 33 is preferably provided with a pair of vertically disposed angle brackets ||0 one of which is located on each side of the side form supporting plunger 92 as best shown in Fig. 11. A large diameter machine screw is threaded through each bracket ||0 until the end thereof is juxtaposed to the said plunger S2 with only working clearance therebetween. A lock nut ||2 fixes the said machine screws in their adjusted positions. The machine screws prevent any undue tilting longitudinal of the side forms 33 about the pivots 35 thereof which would cause binding of the slides 33 thereof between the guides 93 secured to the longitudinal main frame members 43.

Subframe The subfrarne 28 which carries the compaction members 29 and tampers 3|) is composed of a forward transversely disposed channel member H5 and a rear transversely disposed channel member IE5 held in the desired spaced relationship with respect to each other by a plurality of upper channel struts connected to the top anges thereof and by a plurality of suitably bent lower angle struts ||3 connected to the bottom iianges thereof.

The said subframe 28 is suspended at each end from the main frame 25 by means of a pair of adjustable hanger rods ||9 pivotally connected at their lower ends to the top of the channel members H5 and I3 and at their upper ends to a pair of arcuate levers |23 keyed to a suitably disposed subframe hanger shaft |2| at one side of the paver and to a suitably disposed subframe hanger shaft |22 at the other side of the paver. The subframe hanger shaft |2| is supported on suitable bearings |23, |23 and 25 which are in turn supported on the main frame forward cross member 4|, the main frame central cross member 82 and one of the secondary longitudinal main frame members 36 respectively.

An operating crank |26 connected to worm and pinion gearing |27 rotates a sprocket |28 connected by an endless chain |29 to a sprocket |39 keyed cn the end of the subframe hanger shaft |2|, rotates the said hanger shaft |2| and raises and lowers one end of the subframe 28. The subframe hanger shaft |22 is supported on suitable bearings |3, |32 and |33 which are in turn supported on the main frame forward cross member di, the main frame central cross member 62 and the main frame rear cross member 43 respectively. An operating crank |34 connected to worm and pinion gearing |35 rotates a sprocket |33 connected by an endless chain |37 to a sprocket |33 keyed on the subframe hanger shaft |22 and rotates the said hanger shaft |22 and raises and lowers the other end of the subfame 23. ITllhus, the subi-frame 33 may be raised, lowered and tilted with respect to the main frame 25 during the operation of the paving machine as may be desired or required to maintain the longitudinal grade and transverse slope of a strip of pavement being laid thereby.

In order to prevent movement of the subframe 28 with respect to the main frame 25 and to transfer the reaction ofv the movement of the compaction members 29 and tampers 3D carried by the subframe 28 to the main frame 25, a pair of vertically disposed roller guides |39 are welded or otherwise secured to the inside of each of the main frame members f in such suitable spaced relationship as to permit the guide contact plates |48 and IM on the sub-frame members H5 and ||6 respectively to be adjusted in constant contact rthereagainst as hereinafter de.- scribed in detail. The'said roller guides |39 are preferably composed of a channel frame member |42 having a plurality of closely spaced guide rollers |43 journaled on pins |44 pressed through the flanges thereof. The web of the said channel guide frame member |42 is cut away to permit the periphery of the rollers |43 to extend therethrough as best indicated in Figs. 9 and 10.

The guide contact plates |48 located on the subframe transverse channel member |15 near each end thereof is preferably welded thereto as shown in Fig. 10.' However, the guide contact plate I4| located on the sub-frame transverse channel member IIE near each end thereof is adjustably supported on the ends of adjusting screws |45 ydisposed through the said channel member II6 and threaded through a suitable adjusting screw mounting plate |46 welded across the ends of the flanges of the channel member ||6 as best shown in Figs. 9 and 10. By turning up the adjusting screws I 45 the guide contact plates |49 and I4I are brought tightly up against the rollers |48 of the roller guides |39 whereby to prevent longitudinal movement of the subframe 28 with respect to the main frame 25. The said adjusting screws |45 are xed in their adjusted position by means of turning the lock nuts |41 threaded thereon tightly against the adjusting screw mounting plates |45.

The said subframe 28 has a pair of upwardly disposed brackets |48 secured on top of the said forward and rear transversely disposed channel members I I and I6 by such means as the rivets |49. The brackets |48 have the Compactortamper drive shaft 81 journaled on the top thereof by means of suitable bearings |59.

compacter-tamper mechanism The novel compacter-tamper mechanism employed comprises a plurality of compactertamper assemblies each composed of a compaction member 29 and a tamper 30. Each compaction member consists of a suitably curved shoe |55 and a bulldozer plate |56 extending upwardly from the toe of the said shoe |55 both of which are preferably removably secured to a shoe casting |51 in such a manner as to admit of removal for repair or replacement. Each compaction member shoe casting |51 is provided with a pair of upwardly and rearwardly extending arms |58 which are secured to the eccentric strap |59 of eccentrics |69 keyed to a transversely disposed eccentric drive shaft |6| which is sup-ported on a plurality of bearings |62 bracketed from the rear transverse channel subframe member H6 on suitable brackets |63 secured thereto by such means as the machine bolts |64 as best shown in Figs. 9 and 13. Each pair of eccentrics |69 which actuate one of the compacter-tamper assemblies of the paver is preferably mounted on the eccentric drive shaft |6| in 180 degree staggered relationship with respect to the adjacent pair of eccentrics |60 which actua-te the adjacent compacter-tamper assembly to reduce the vibration of the compacter-tamper mechanism to a minimum, see Fig. 9.

Each compaction member 29 is pivotally linked and supported from the forward transverse channel sub-frame member I|5 on a pair of depending pivot bars |65 each pivoted by an upper pivot pin |66 journaled through a pair of brackets |61 secured by machine bolts |68 to the said forward transverse sub-frame member I I5 and by a lower pivot pin |69 journaled through an L- shaped fitting |18 xed through one or two suitable lugs |1I cast integral with and extending upwardly from the shoe casting |51 by the securing nuts |12.r

Each tamper 39 is formed of a suitably curved plate 380 which is generally horizontally disposed and positioned directly to the rear of each compaction member 29. A spacer bar |590 is positioned between and supported by each pair of eccentric straps |59 from which the forward end or toe of each tamper 36 is pivotally supported by means of an adjustable threaded sleeve type depending pivot bar |13 pivoted by an upper pivot pin |14 extending through a lug |15 secured by means of a bolt |16 to the said spacer bar |598 and by a lower pivot pin |11 extending through a suitable tting |18 secured by means of a nut |19 to the center of the front end tamper supports |89. The rear end or heel of each tamper support |88 is pivotally connected by means of a suitable fitting IBI, securing nut |19 and pivot |82 to the depending end of a tamper strut rod |83 secured by upper and lower nuts |84 threaded thereon to a bracket |85 welded or otherwise secured to a sub-channel |86 disposed parallel to and nested within the rear transversely disposed channel subframe member |I6. The said sub-channel |86 is retained in slidable relationship against slide plates |81 welded on the web of the said rear transversely disposed channel sub-frame member I I6 by batteri angles |88 secured across the edges of the flanges of the said channel sub-frame member IE6 by angle clips |89 as best shown in Fig. 13.

The said sub-channel |86 is raised and lowered vby quick-lift means as hereinafter described to quickly adjust the elevation at which the heel of the tamper 38 is positioned during the operation of the machine. Also, the height at which the compaction members 29 operate with respect to the eccentric drive shaft I6! may be adjusted by threading the pivot bars supporting the same more or less into the upper pivot pin |66 journaled through the brackets |61 on the forward transversely disposed channel sub-frame member II5. The pivot bars |65 are xed in their adj usted position by means of lock nuts |99 threaded thereon. The height at which the forward end of the tampers 38 operates with respect to the eccentric drive shaft |6I may be adjusted by turning the pivot bar I 13 into or out of its threaded sleeve I9I. A lock nut |92 threaded on the pivot bar |13 xes the same in its adjusted position when turned against the end of its threaded sleeve I9I.

The quick-lift mechanism employed to support, raise and lower the rear ends or heels of the tampers 39 is best shown in Figs. 6, '7, 8 and 13. As hereinbefore described, the heels of the tampers 30 are pivotally connected to the lower depending end of tamper strut rods |83 which are in turn fixed through brackets welded to a sub-channel |86 retained in nested relationship within the said rear transversely disposed channel subframe member IIS. The said sub-channel |86 is suspended from a quick-lift shaft |93 journaled in suitable cradles formed in the upper channel struts |I1 of the sub-frame 28 by means of two bifurcated arcuate levers |94 keyed on the said quick-lift shaft |93y which engage spaced nuts |95 threaded on the upper end of hanger rods |96 welded to the said sub-channel |86 and extending upwardly therefrom through the flange thereof and telescopingly through the upper flange of said rear transversely disposed channel sub-frame member II6 as best shown in Fig. 8.

Lock nuts I'! keep the spaced nuts |95 threaded on the hanger rods |96 in their proper adjusted position. The said quick-lift shaft |93 is also journaled at each side of each of the said bifurcated arcuate levers |94 through suitable angle clips |28 welded to the top of the said rear channel sub-frame member I as shown in Fig. 8.

The quick-lift shaft |93 is rotated by a suitable quick-lift lever |99 keyed thereto and is prevented from being rotated by the lifting action of the heels of the tampers 36V during the operation of the paving machine by a. suitably disposed spring loaded pawl 262 on the said quick-lift lever |S9 which engages a ratchet 29| secured to one of the upper channel struts of the subframe 28 by means of the bolts 202.

Referring now to Fig. 16, the compacter-tamper mechanism is represented diagrammatically. A compaction member 29 and tamper 3'are shown in a, b, c and d positions which represent a preferred movement thereof through one complete cycle of the movement of the eccentric |60 in the direction indicated by the arrows 223 in Figs. 13 and 16 around the eccentric drive shaft |5| Fig. 17 shows the path takenv by the point X at the heel of the compaction member 29 and Fig. 18 shows the path taken by the point Y at the toe of the said compaction member 29 during one complete revolution of the said eccentric drive shaft Ii and the movement of the eccentric |60 therearound. Also, Fig. 19 shows the path takenr by the point Z at the toe of the tamper member 3B during one complete revolution of the eccentric drive shaft |6| and the movement of the eccentric 5G therearound.

Figs. 16 to 19 inclusive illustratel digrammatically the combined generally elliptical and rocking movement ofthe compaction members in a path parallel to the travel of the paver when in operation coupled with and followed by a treadle action tamper which have been found to produce an extremely dense fully compadted pavement. The bulldozing action of the compactors 29 is illustratedv in Fig. 16 which also shows the a, b, c and d positions of the bulldozer plate |52 carried by each compaction member 29 during one complete revolution of the eccentric drive shaft |6| and the movement of the eccentric |68 therearound.

The term generally elliptical and rocking movement of the compaction members is not to be construed as limiting the invention to the exact movement shown in the diagrammatic illustration disclosed in Figs. 16 to 19 inclusive. The movement of the compaction members may also be defined as a forward and back movement and a downward movement at the completion of the forward movement greater at the front of the saidV compaction members than at the rear thereof. Or, the movement of the compaction members may bestatecl as a compound motion including a forward and back movement and an oscillatory movement. The adjustment of the compactors 29 with respect to their point of suspension and the amount of eccentricity of the eccentric |26 determines the precise movement thereof.

The bulldozers |56 advance surplus material spread ahead of the compactor-tamper mechanism and permit only suflicient material to be fed from the hopper 3| under the compaction members 29 to assure a finished thoroughly dense pavement of the depth to which the paver is adapted to operate. The action of the compaction member 29, tampers 36 and, of course, the bulldozers |55 is preferably quite rapid, it being preferred to drive the eccentric shaft 6| at 150 to 300 R. P. M. The drive for the compactor-tamper mechanism will be hereinafter described in detail A special tamper member 34 is provided at 1- each side of the hopper 3| disposed adjacent the side forms 33 and locate-d just ahead of the compaction members 2d. The said special tampers 34 are preferably used to provide an extremely dense and workable concrete adjacent the side forms 33 which will not slump unreasonably as the side forms 33 progress with the travel of the machine. Referring now to Fig. 14, each special tamper 3i! is rigidly connected to a tamper bar 285 reciprocatingly mounted in telescopic relationship through suitable brackets 266 welded or otherwise secured to the hopper 3 The tamper bar 265 is preferably provided with a left and right hand threaded adjusting section 26'! onto which lock nuts 228 are threaded to iix the tamper bar 265 at any length to which it may be adjusted. A rapidly rotating special tamper eccentric shaft 209 is journaled on suitable bearings 2 i and is driven by suitable means as hereinafter described in detail. Each special tamper is pivotally suspended by a pivot pin 2|| from an eccentric arm 22 depending from a suitable eccentric 2|3 mounted thereabove on the eccentric shaft 269. The eccentric shaft 269 is preferably rotated at a speed to reciprocate the special tampers 3d considerably faster than the movement of the compaction members 29.

Drives Referring now particularly to Fig. 15 and generally to the drive mechanism shown elsewhere throughout the drawings, the entire machine is preferably powered by a single source of power such as the gasoline or Diesel engine 'i2 through a main clutch '|3 operated by a main clutch hand lever 255 disposed within reach of the operators platform 'i5 connected to the clutch lever '|36 by a suitable linkage 2|5. A main transmission 'M controlled by a hand lever '|40 is coupled to the clutch 'i3 and has the main drive shaft 2|! coupled thereto by means of a suitable flexible coupling 2| 8.

A caterpillar drive transmission SS controlled by a hand lever 696 is driven by an endless chain drive 2|9 running over a sprocket 220 keyed on the main drive shaft 2|'! and a sprocket 22| extending from the caterpillar drive main clutch '15| having a control lever T90 which is coupled to the said caterpillar drive transmission 69. The slow speed shaft 222 of the caterpillar transmission has a sprocket 223 keyed thereon which is connected by an endless chain 221i to a sprocket E25 keyed on an idler shaft 226 onto which clutches 22'! controlled by hand levers 2216 are mounted through which power is applied to each of the left and right hand caterpillar treads 2'! by means of chain drivesv 228 running over sprockets 229 keyed on stub shafts 23) carrying the driven members of the clutches 22'! and over the drive sprockets 52 of the caterpillar treads 21.

The main drive shaft 2|! has a Compactortamper clutch 23| thereon controlled by a hand lever 23H) through which power is applied to an idler shaft 232. The compactor-tamper drive shaft 6'! is driven from the idler shaft 232 by means of a chain drive 233 running over-sprockets 2M and 235 keyed to the idler shaft 232 and to the compacter-tamper drive shaft 6'! respectively. Inasmuch as one end of the Compactortamper drive shaft is supported on the main frame 25 and the other end of the Compactortamper drive shaft is supported on the subframe 28, and since the sub-frame 23 is adapted to be raised and lowered withrespect to the main frame 25, two universal joints 235 and a splined section 61|) are employed to operatingly connect the two end sections of the said compactor-tamper drive shaft 61. The eccentric drive shaft |6| is driven by a chain drive 231 running over a sprocket 233 keyed on the eccentric drive shaft |6| and a sprocket 239 keyed on the compactor-tamper drive shaft 51 located between the brackets |48 on the sub-frame 28.

The agitator shaft 82 is driven by means of a chain drive 225 running over a sprocket 82 keyed on the said agitator shaft 89 and over a sprocket 24| keyed on an idler shaft 242 rotated by the compactor-tainper drive shaft 51 through the meshed reduction gears 243 and 244 keyed on the idler shaft 242 Varid the compactor-tamper drive shaft 51 respectively.

The special tampers 34 are driven by means of a chain drive 245 running over sprockets 245 and 241 keyed on the idler shaft 232 and on the tamper eccentric shaft 299 respectively.

The various drive means disclosed and described herein are not a part of this invention, it being understood that the means for applying power to and driving the various movable elements of the novel paver disclosed herein may be altered and arranged in any desired manner without departing from the scope of the invention.

Alternate Embodiment The novel paver disclosed in Figs. 1 to 19 inelusive is changed in but a few minor details to admit of the same being used for laying, compacting and tamping asphalt mixes.

The embodiment of the invention preferably employed to lay concrete mixes disclosed in Figs. 1 to 19 inclusive and the embodiment of 'the invention preferably employed to lay asphalt mixes disclosed in Figs. 20 to 22 inclusive are substantially identical except that the side forms 339 of the embodiment of the invention disclosed in Figs. 20 to 22 inclusive are shortened and that heating elements 248 and 249 have been added to the compaction members 29 and `tampers 35] respectively which are connected by electric cables 256 through the conduit 25| to an electric panel and fuse box 252. By referring particularly to Figs. 21 and 22, it will be observed that a suitable electric generator 35 is preferably added to the embodiment of the invention disclosed therein which is supported on the secondary longitudinal main frame members 63 and is driven by means of a V-belt drive 253 running between pulleys 25rand 255 keyed on the generator shaft 256 and the main drive shaft 2|1 respectively. The said generator 35 is electrically connected to the electric panel 252.

It will be noted that the special tampers 34 have been omitted in the embodiment of the invention disclosed in Figs. 2|) to 22 inclusive inasmuch as they need not be employed when the novel paver is being used for laying most asphalt mixes.

OPERATION The embodiment of the invention shown in the drawings have been described in detail and a description of the operation of the various elements has been given in connection with the novel mechanisms employed, however, following of the vnovel paver as a unitary whole showing the operation of the component parts thereof in relationship to each other.

In the use of a paver carrying its own side forms las herein disclosed, the front wheels 26 and rear caterpillar treads 21 both first rest on the rough grade 81. The term rough grade 31 used herein refers to the fine or partially graded terrain, subgrade or other base upon which a concrete or asphalt pavement is to be laid by the novel paver herein disclosed.

The sub-frame 28 is adjusted with respect to the main frame by means of the cranks |26 and |34 to set the Compactors 29 and tampers 39 to the desired finished grade 818 with the heels of the tamper members lifted with respect to the Compactors 29 by the quick-lift lever 99. The side forms 33 or 338 are set against the rough grade 81 by means of the levers 91. If a concrete pavement is to be laid by the paver, the special tamper members 34 are adjusted to the desired position by turning the adjusting sections 201 of the tamper bars 265 If an asphalt will be given a brief description of the operation mix is to be laid by the paver, the special tamper members are removed or otherwise made inoperable and the generator 35 is started to supply current to the heating elements 248 and 249 of the compaction members 29 and tampers 30 respectively for pre-heating the same to prevent the asphalt mix from sticking thereto. The compactor-tamper mechanism lis then started operating and the conciete or asphalt mix is dumped by supply trucks or the like into the hopper 3| as indicated by the dash and two dot lines 251 in Figs. 2, 3 and 21 wherein the agitator blades 32 which revolve continuously during the operation of the compactor-tamper mechanism distribute the said mix across the hopper 3| from whence it gravitates to the rough grade 81 below the open bottom 3H! of the hopper 3| and ahead of the compaction members 29 which are equipped with bulldozer plates |56.

The mix thus spread as indicated by the dash and two dot lines 258 in Figs. 2, 3 and 21 is compacted by the compaction members 29 having a combined elliptical and rocking movement as is obvious from the diagrammatic representation of the operation thereof disclosed in Figs. 16 to I9 inclusive, The bulldozing action of the compaction members 29 causes the bulldozer plates |56 thereof to advance surplus mix not compacted into the finished pavement strip thereby ahead of the said compaction member 29 as the machine is moved forward as indicated by the arrow 250 in Figs, 1, 2, 3 and 2l under power applied to the caterpillar treads 21 as hereinbefore described in detail. The tamper members 39 follow the compaction members 29 and tamp the mix compacted by the compaction members 29 to a final smoothness and to a maximum degree of density. As soon as the front ends of the caterpillar treads 21 creep onto the finished pavement at the finished grade 819, the quicklift mechanism operated by the quick-lift lever |99 is employed to drop the heels of the tampers 39 and the sub-frame 28 carrying the compaction members 29 and tampers 30 is lowered by the cranks |26 and |34 to readjust the compactor-tamper mechanism to lay the desired thickness of pavement with the front wheels of the paver running on the rough grade 81 and the caterpillar treads 21 thereof running on the finished grade 319 of the pavement laid by the machine.

The sub-frame 28 may be tilted by the manipulation of the cranks 26 and i3d when it is desired to lay a strip of pavement on a transverse slope or when it is desired to provide a superelevation at the outer side of a curved strip of pavement being laid.

If and when the front wheels 26 travel over a change of grade, or if the machine is backed off of a strip of pavement just laid thereby, the height of the compacter-tamper mechanism is adjusted to suit the particular condition by the manipulation of the cranks ltand i315 which raise or lower the sub-frame 2S carrying the entire compacter-tamper mechanism and by manipulating the quick-lift lever I9@ which raises and lowers the heels of the tampers 36.

Obviously, not only does the machine completely and accurately lay concrete and asphalt mixes into a completely compacted pavement of maximum density but it is completely adapted to function under all working conditions to lay concrete or asphalt mixes without the use of pre-set forms. However, as hereinbefore mentioned, it is contemplated that the novel compactor-tamper mechanism disclosed herein may be employed in like machines adapted to travel in the usual and customary manner on pre-set road forms.

Although but one embodiment of the invention and one modification thereof has been disclosed and described herein, it is obvious that many changes may be madev in the size, shape, arrangement and details of the various elements of the invention without departing from the spirit thereof and it is not intended to limit thev scope of the invention other than by the terms of the appended claims.

I claim:

l. In a paving machine including mobile means therefor, a series of compaction members each composed of a bottom shoe and a front bulldozer plate disposed transversely of said machine, a single line of linkage means spaced transversely of said Compactors pivotally suspending said compactors from said machine to the level of the top of pavement to be laid thereby, a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, and rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion 2. In a paving machine including mobile means therefor, a series of compaction members each composed of a bottom shoe and a front bulldozer plate disposed transversely of said machine, a single line of linkage means spaced transversely of said Compactors pivoted to the machine and to the compaction members suspending the said compaction members to the level of the top of pavement to be laid by said machine, a transversely disposed eccentric shaft on said machine, eccentrics on said eccentric shaft, and rearwardly and upwardly extending arms connecting said compaction members to said eccentrics whereby upon rotation of said eccentric shaft a combined generally' elliptical and rocking movement in a path parallel to the travel of the machine is imparted to the said compaction members wherein the forward portion of each compaction member has a greater downward movement than the rear portion thereof.

3. In a paving machine including mobile means therefor, a series of compaction members each CII abastecel composed of a bottom shoe and a front bulldozer plate disposed transversely of said machine, a single line of linkage means spaced transversely of said Compactors pivoted to the machine and to the compaction members suspending the said compaction members to the level of the top of pavement to be laid by said machine, a transversely disposed eccentric shaft on said machine, eccentrics on said eccentric shaft, and rearwardly and upwardly extendingarms connecting said compaction members to said eccentrics whereby upon rotation of said eccentric shaft a combined generally elliptical and rocking movement in a path parallel to the travel of the machine is imparted to the said compaction members wherein the forward portion of each compaction member moves in a generally elliptical path having a greater vertical axis than the vertical axis of the generally elliptical path in which the rearward portion thereof moves.

e. In a paving machine, a main frame including mobile means therefor, a sub-frame, means for suspending said sub-frame from said main frame including means for raising, lowering and tilting the same with respect to the said main frame, a series of compaction members disposed transversely of said sub-frame, each compaction member being composed of a bottom shoe and a front bulldozer plate, a single line of linkage rods spaced transversely of said compactors suspending said compaction members from said sub-frame pivoted to the sub-frame at their upper end and to the compaction members at their lower end, an eccentric shaft mounted transversely of said machine on said subframe, eccentrics mounted on said eccentric shaft, and rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion.

5. In a paving machine including mobile means therefor, a series of compaction members each composed of a bottom shoe and a front bulldozer plate disposed end to end transversely of the machine forming an aggregate member for compacting paving material supplied thereto into a strip of pavement and advancing surplus paving material thereahead, a single line of linkage means spaced transversely of said Compactors pivotally suspending said compaction members from said machine to the level of the top of pavement to be laid by said machine, means for raising, lowering and laterally tilting said aggregate member with respect to pavement being laid and the terrain over which the pavement is being laid, a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, and rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members have imparted thereto a compound generally elliptical and rocking motion in a path parallel to the travel of the machine wherein the forward portion of each compaction member has a greater downward movement than the rear portion thereof.

6. In a paving machine including mobile means therefor, side forms carried thereby, a series of compaction members each composed of a bottom shoe and a front bulldozer' plate disposed end to end transversely between the said side forms forming an aggregate member for compacting paving material supplied thereto into a strip of pavement and advancing surplus paving material thereahead, a single line of linkage means spaced transversely of said compactors pivotally suspending said compaction members from said machine to the level of the top of pavement, to be laid by said machine, a transversely disposed eccentric Yshaft on said machine, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members have imparted thereto a compound generally elliptical and rocking motion in a path parallel to the travel of the machine wherein the forward portion of each compaction member has a greater downward movement than the rear portion thereof, and resilient means between the machine and the said side forms for urging the said side forms against the terrain adjacent the strip ofpavement being laid.

7. In a paving machine including mobile means therefor, a series of compaction lmembers each composed of a bottom shoe and a front bulldozer plate disposed end to end transversely of the machine forming an aggregate member for compacting paving material supplied theretointo a strip of pavement and advancing surplus paving material thereaheada series of tampers disposed end to end transversely of the machine forming an aggregate member for tamping the strips of paving compacted by the said compaction members, a single line of linkage means spaced transversely of said Compactors including pivot means at both ends thereof pivotally suspending said compaction members from said frame to the level of the top of the pavement to be laid by said machine, means for raising, lowering and laterally tilting said aggregate members simultaneously with respect to pavement being laid and the terrain over which the pavement is being laid, `a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms` connecting said compaction members with said eccentrics whereby upon rotation ofY said eccentric shaft the compaction members have imparted thereto a compound generally elliptical and rocking motion in Va path parallel to the travel of the machine wherein the forward portion of each compaction member has a greater downward movement than the rear portion thereof, linkage means including transverse pivot means suspending the rear of said tampers from said machine to the level of the top of pavement to be laid by the machine, and linkage means connecting the forward end of said tampers to said compaction member actuating arms whereby to impart to said tampers a treddle action.

8. In a paving machine including mobile means therefor, side forms carried thereby, a series of compaction members each composed of a bottom shoe and a front bulldozer plate disposed end to end transversely between the said side forms forming an aggregate member for compacting paving material supplied thereto into a strip of pavement and advancing surplus paving material thereahead, a series of tampers disposed end to end transversely between said side forms forming an aggregate member for tamping the strips of paving compacted by the said compaction members, a single line ofA linkage means spaced transversely of said Compactors including pivot means at both ends thereof pivotally suspending said compaction members from said machine to the level of the top of the pavement to be laid by said machine, a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members have imparted thereto a compound generally elliptical and rocking motion in a path parallel to the travel of the machine wherein the forward portion of each compaction member has a greater downward movement than' the rear portion thereof, linkage means including transverse pivot means suspending the rear of said tampers from said machine to the level of the top of pavement to -be laid by the machine, linkage means connecting the forward end of said tampers to said compaction member actuating arms whereby to impart to said tampers a treddle action, and `resilient, means between the machine and thel said side forms for urging the said side forms' against the terrain adjacent the strip of pavement being laid.

9. In a paving machine including mobile means therefor, side formscarried thereby, a series of compaction members each composed of a bottom shoe and a front bulldozer plate disposed transversely of said machine, a single line of linkage means spaced transversely of said compactors pivotally suspending said Compactors-from said machine to the level of the top of pavement to be laid thereby, a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion, and resilient means between the main frame and the side forms for urging said side fonms against the terrain adjacent the strip of pavement being laid.

' 10. In aV paving machine, a main frame including mobile means therefor, side forms carried l* thereby, a sub-frame, means for suspending said sub-frame from said main frame including means for raising, lower and tilting the same with respect to the said main frame, a series of compaction members disposed transversely of said sub-frame, each compaction member being composed of a bottom vshoe and a front bulldozer plate, a single line of linkage rods spaced transversely of said Compactors suspending said compaction members from said sub-frame pivoted to the sub-frame at their upper end and to the compaction members at their lower end, an eccentric shaft mounted transversely on said subframe, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion, and means for urging said side forms against the terrain adjacent the strip of pavement being laid.

1l. In a paving machine, a main frame including mobile means therefor, a subframe, means for suspending said sub-frame from said main frame including means for raising, lowering and tilting the same with respect to the said main frame, a series of compaction members disposed transversely of said -sub-frame, each compaction member being composed of a bottom shoe and a front bulldozer plate, a single line of linkage rods spaced transversely of said compactors suspending said compaction members from said sub-frame pivoted to the sub-frame at their upper end and to the compaction members at their lower end, an eccentric shaft mounted transversely on said subframe, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compactio-n members are given a combined generally elliptical and rocking motion, a tamper disposed rearwardly of each compaction member, linkage means including transverse pivot means suspendeding the rear of said tampers from said sub-frame to the level of the top of pavement to be laid by the machine, and linkage means connecting the forward end of said tampers to said compaction member actuating arms whereby to impart to the said tampers a treddle action.

12. In a paving machine, a main frame including mobile means therefor, side forms carried thereby, a sub-frame, means for suspending said sub-frame from said main frame including means for raising, lowering and tilting the same with respect to the said main frame, a series of compaction members disposed transversely of said sub-frame, each compaction member being composed of a bottom shoe and a front bulldozer plate, a simple line of linkage rods spaced transversely of said Compactors suspending said compaction members from said sub-frame pivoted to the sub-frame at their upper end and to the compaction members at their lower end, an eccentric shaft mounted transversely on said sub-frame, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion, a tamper disposed rearwardly of each compaction member, linkage means including transverse pivot trans.- verse pivot means suspending the rear of said tampers from said sub-frame to the level of the top o-f pavement to be laid by the machine, linkage means connecting the forward end of said tampers to said compaction member actuating arms whereby to impart to said tampers a treddle action, and resilient means between said main frame and said side forms for urging said side forms against the terrain adjacent the strip of pavement being laid.

13. In a paving machine including mobile means therefor, a series of compaction members each composed of a shoe curved on its bottom longitudinally with respect to the machine and disposed transversely of said machine, a single line of linkage means spaced transversely of said Compactors pivotally suspending said compactors from said machine to the level of the top of pavement to be laid thereby, a transversely disposed eccentric shaft on said machine, eccentrics mounted on said eccentric shaft, and rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion.

14. In a paving machine, a main frame including mobile means therefor, a sub-frame, means for suspending said sub-frame from said main frame including means for raising, lowering and tilting the same with respect tothe said main frame, a series of compaction members disposed transversely of said sub-frame, each compaction member being composed of a shoe curved on its bottom longitudinally with respect to the machine, a single line o-f linkage rods spaced transversely of said Compactors suspending said compaction members from said sub-frame pivoted to the sub-frame at their upper end and to the compaction members at their lower end, an eccentric shaft mounted transversely on said sub-frame, eccentrics mounted on said eccentric shaft, rearwardly and upwardly extending arms connecting said compaction members with said eccentrics whereby upon rotation of said eccentric shaft the compaction members are given a combined generally elliptical and rocking motion, a tamper disposed rearwardly of each compaction member, linkage means including transverse pivot means suspending the rear of saidY tampers from said sub-frame at the level of the top of pavement to be laid by the machine, and linkage means connecting the forward end of said tampers to said compaction member actuating arms whereby to impart to the said tampers a treddle action.

ROBERT D. BAKER.

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