US2169406A - Retread paver - Google Patents

Description

Aug. 175', 1939.

W. A. COST ET AL RETREAD PAvER VFiled'Nov. 9, 1954 lulllw 4 Sheets-Sheet 2 Aug. 15, 1939. W A- COST ET AL 2,169,406

RETREAD PAVER Filed Nov. v9, 1934 4 Sheets-Sheet 3 i Patented Aug. 15, 1939 UNITED s TATr/:s

PATENT OFFICE arrasar raven Application November 9, 1934, Serial No. '152.229

24 Claims.

Our invention relates to re-tread pavers, or machines adapted to be propelled over a road and, while so moving, to engage loose aggregate on the road surface, to mix such aggregate with 5 a suitable binder, and to discharge and distribute the mixture in the desired cross-section.

It is the object of our invention to produce a machine of this type which will have advantages over prior machines. More specifically, it is our l object to produce a machine which will be selipropelled and which will be supported upon four ground-engaging wheels all of which are driven and all of which may be steered, the rear wheels being steerable independently of the front wheels l for a purpose which will hereinafter become apparent. A' further object of our invention is to elevate the un-treated aggregate from the road surface and to subject it to a thorough mixing with the binder by a mechanical mixer. Still another object of our invention isy to produce a re-tread paver which, although operated on a relatively uneven sub-grade surface, will distribute the paving material smoothly and evenly. In carrying out our invention we construct the vehicle with a main frame supporting an engine which supplies power for moving the vehicle and for driving the mixing device as well as for effecting certain adjustments. The main frame of the vehicle is supported upon front and rear driving wheels, one pair of such wheels preferably being mounted upon a truck pivotally connected to the main frame on a longitudinal axis so as to afford a three-point suspension forA the main frame. Both the front wheels and the rear wheels are arranged to be driven from the engine and also to be steerable.

Beneath the main frame of the vehicle we suspend a sub-frame carrying a mechanical mixing device preferably in the form of a pug-mill mixer driven from the vehicle engine. In advance of the pug-mill, the sub-frame carries a pair of forwardly and outwardly diverging ground-engaging blades adapted to gather aggregate and to direct it to the pug-mill as the machine moves along the road. 'I'he main frame carries one or more tanks containing a supply of liquid binder which is discharged on to the aggregate as it enters the pug-mill and is thoroughly mixed with the aggregate as it passes rearwardly through the pus-mill.

Loosely suspended from the sub-frame which carries the pug-mill are a pair of relatively long ground-engaging shoes upon which, at the rear of the machine, is mounted a distributing blade 55 adapted to distribute to any desired cross-section the mixture discharged from the rear end of the pug-mill. Means'. controlled from an operators station on the main frame are provided for adjusting the distributing blade in a vertical plane relative to the'shoes which carry it. 6

The accompanying drawings illustrate our invention: Figs. l and 2 are a plan and a side elevation respectively of the complete machine; Fig.

3 is a view similar to Fig. 2 but with parts of the machine broken away to illustrate the construcl0 tion more clearly; Fig. 4 is a plan view of the subframe, pug-mill, gathering blades, and distributing blade; Fig. 5 is a detailed view illustrating in elevation, as indicated by the line 5-5 o1' Fig.

4, the mechanism by which the distributing blade is vertically adjusted relatively to the shoes which support it; and Figs. 6 and 'l are partial transverse vertical sections on the lines 8 6 and 1-1 respectively of Fig. 1. I

The main frame of the machine shown in the drawings comprises longitudinal side members I0,

a front cross member il, a rear cross member i2, and intermediate cross members I3 and il. the cross member i3 being located near the iront end of the machine and the cross member Il near the rear end. -The cross member I3, which is preferably tubular in cross-section, carries steerable front supporting wheels 20 near its ends, such wheels serving to support the iront end of the machine. The rear end of the machine is supported upon a truck comprising a transverse tubular member 2i carrying the rear wheels 22 and pivotally attached to the main frame through the medium of a longitudinally extending pivot shaft 23 extending between the 35 cross members i2 and il of the main frame, the member'Zl being provided with a rigid bearing 24 of considerable longitudinal extent for the shaft 23.

As previously set forth the rear wheels as well 40 as the front wheels of the machine are steerable. To this end, each of the rear wheels 22 is mounted upon a stub axle projecting outwardly from a hollow casing 30, the upper end of which is rigid with a vertical spindle 3i mounted in a suit- 45 able bearing 32 on the member 2|. The two rear wheels are interconnected for joint steering movement by means of arms 33 which are secured respectively to the spindles 3i and which are interconnected by the usual tie rod 3l, alias shown 50 in Figs. 1 and 7.

The mounting of the front wheels is generally similar to that of the rear wheels, each front wheel being mounted at one side of' a hollow casing 35 rigid with a vertical spindle l. carried I6 in a suitable bearing I1 at one end of the tubular cross member i3. Rigid with the spindles I6 are arms Il which are interconnected by means of a tie rod I8.

Mountedupon the main frame cf the machine, preferably near the front end thereof, is a power plant 4l, preferably an internal-combustion engine. which supplies power for driving the front and rear wheels. A'Ihe drive from the engine to the wheels is through a friction clutch I l controlled by a clutch-operating lever I2 and also through a change-speed transmission mechanism Il. Details of the change-speed transmission mechanism are not illustrated, as any desired device of this kind may be used to provide the desired speed ratios.

The change-speed transmission mechanism is operatively connected. to the driven element of the clutch 4i as by the shaft Il and includes two driven shafts I5 and 46 (Figs. 1 and 3) connected respectively to the front and rear wheels.

- As is evident from Fig. 7, the drive for the rear wheels includes differential mechanism enclosed within a housing l0 centrally located on the member 2|, such differential mechanismincluding a forwardly extending driving shaft 5I and two laterally extending driven shafts 52. In approximate alinement with the two shafts 52, the casings l0. which respectively carry the two rear wheels. are provided with shafts 53 connected respectively to the shafts 52 through intermediate shafts il. To permit steering movement of each of the wheels 22, each shaft 54 is extensible and is connected to its associated shafts I2 and Il through universal joints 55.

Each of the shafts 53 is operatively connected to its associated wheel 22 by means of powertransmission mechanism located within the casing I0. To this end, we may provide within the v'casing I. a gear 56 rotatable with the wheel 22, an idler 51 meshing with the gear 60, and a pinion 58 meshing with the idler 51, the pinion 58 being rotatable with the shaft 5I.

The drive shaft 5I of the differential mechanism enclosed in the casing 50 is operatively connected to the driven shaft 46 of the changespeed transmission mechanism by means of a propeller shaft 60 connected to the shafts 46 and 56 through universal joints 6|. The shaft may have associated with it suitable brake mechanisin 62 for the vehicle.

The drive train for the front wheels is sub-- stantialiy the same as that just described for the rear wheels, the front-wheel driving shaft 45 being connected through a propeller shaft 84 with differential mechanism located in the casing `6l v(see Fig. 3), such differential mechanism being operatively connected to the front wheels 20 through flexible transversely extending shafts a'nd gearing located within the casing l5.

Beneath the main frame of the vehicle there is suspended a sub-frame 6I carrying a pug-mill mixer 69 including a;v pair of longitudinally extending shafts 10 upon which inclined mixing blades 1I are mounted, as is customary in pugmills. For the purpose of driving the pug-mill, we provide an engine-driven shaft Il conveniently mounted in and projecting rearwardly from the casing of the change-speed transmission mechanism 43, as shownfin Fig. 1. Suitable clutch mechanism controlled by a control member 14 is employed for connecting the pug-mill to the power plant 40 at will. The drive for the pug-mill is through an extensible shaft Il connected through universal joints to the shaft Il and to a shaft 'I6 which is rotatably mounted in a casing 'i1 containing gearing or other mechanism by means of which the shaft 16 is connected to the two longitudinally extending shafts 1l of the pug-mill, as shown in Figs. 3 and 6.

The pug-mill 69 is open at its front and rear ends, laterally spaced vertical plates and an inclined apron Il located at the front end of the pug-mill serving to direct aggregate into the mill as the machine moves forwardly along the road. Extending forwardly and outwardly from the front ends of the two plates 80 are gathering blades I2 adapted to engage aggregate on the road surface and to move it inwardly to arpoint where it can pass rearwardly between the two plates 86.'

The sub-frame 6I and the parts mounted upon it, such as the pug-mill 89, the plates Iii, apron Il, and gathering blades 82, are all vertically adjustable as a unit relative to the frame of the machine. To this end, the sub-frame 68 is suspended from the main frame of the machine by a front pair of suspension chains I5 and a rear pair of suspension chains 86. The rear' chains I6 extend upwardly from their point of attachment to the sub-frame 6I and around transverse rotatable shafts Il mounted on the main frame of the machine and conveniently supported from the intermediate cross member I4. (See Fig. 6.) The front pair of chains extend over sheave pulleys Il, located above their points of attachment to the sub-frame 6l, and thence rearwardly to the shafts Il, to which they are secured. 'I'he two shafts 81 are adapted to be rotated by irreversible power-transmission mechanism, such as worm gearing, contained in casingsls.

For the purpose of holding the sub-frame 6l in a central position laterally of the machine we employ hinge members and 9i pivotally connected to the sub-frame at the front and rear thereof on transverse axes. The front hinge member 90 extends forwardly from its point of pivotal connection to the sub-frame 68 and is pivotally connected on a transverse axis to the front cross member il of the main frame. The front hinge member SII, in addition to locating the sub-frame 6B laterally, also transmits draft to it. The rear hinge member 8i extends upwardly andrearwardly from its point of attachment to the sub-frame 6l and is pivotally connected at its rear end to a member 92 which is longitudinally slidable in a suitable guide 93.

carried by the rear cross member i2 of the main frame.

.The binder which is to be mixed with the aggregate in the pug-mill 69 may be carried in 'a pair of tanks $5 mountedlat the sides of the main frame of the machine. Binder from the tanks 95 is sprayed upon aggregate entering the pug-mill l! through a discharge nozzle 96 located adjacent the front end of the pug-mill. We prefer to control the rate at which binder is discharged from the nozzle by the mechanism set forth in the Patent No. 2,064,365 which mechanism includes a valve 91 for controlling the rate of binder-discharge from the nozzle 96, a. swinging vane il mounted between the plates 80 and adapted to rest upon the surface of aggregate passing between such plates,rand an operative connection $9 between the valve 91 and vane 98, whereby the amount of binder supplied tc the pug-mill is accurately proportioned to the amount of aggregate entering the pug-mill. The Wallace application above referred to contemplates that th e binder emerging from the nozzle $6 will be subjected to a constant discharge head -source of supply located at either side of the machine and to discharge it into either or both o. the tanks 05. When the machine is in. operatixm, the valves can be manipulated so that the pump will draw binder from either supply tank and discharge the excess into either tank.

The aggregate and binder entering the pugmiil 60 are thoroughly mixed together during their rearward passage through the pug-mill and are discharged upon the sub-grade surface through theA open rear end of the pug-mill. To distribute this material to the desired cross-sec u tion, we prefer to employ a transversely extending distributor blade |05 which is supported at the rear of the machine from two longitudinally extending ground-engaging shoes |06. These shoes are drawn over the sub-grade surface with the machine by means of links |01 which connect their front ends with downwardly extending arms |06 on the sub-frame 68. (See Figs. 2 and 4.)

The distributing blade |05 is not mounted rigidly upon the rear ends of the shoes |06 but instead s,supported therefrom through the medium of adjustable mechanism by means of which its vertical disposition may be varied to control the cross-section in which the paving material discharged from the pug-mill 69 is distributed. This. adjustable mechanism includes a pair of generally parallel links and |I| located on each side of the machine. The front ends of each pair of these links are pivotally connected on vertically spaced axes to a bracket ||2 extending upwardly from the associated shoe |06 in advance of the rear end thereof, while their rear ends are connected to a vertically extending member I|3 secured to the rear face of the distributing blade |05. The lower link ||0 of each pair of links is arched, as is clear from Figs. 2 and 3, to pass over the top of the distributing blade |05 and over a blade re-enforcing angle |4.

The two ends of the distributing blade |05 are independently adjustable in a vertical plane by swinging arms ||5 which are pivotally mounted on transverse axes on the respective shoes |06 and the free ends of lwhich are connected by links ||6 to the associated links ||0. Conveniently, each of the arms ||5 is rigid with the driven shaft of irreversible power-transmission mechanism, such as worm gearing, contained in a casing ||1 mounted on the associated shoe |06. If desired, a stationary graduatedscale ||0 may be associated with each of the arms ||5 to indicate the adjusted position thereof, and thereby to indicate the height of each end of the distributing blade |05 above the sub-grade surface upon which the shoes |06 rest.

The assembly of shoes |06, distributing blade |05, and the mechanism interconnecting them is prevented from swinging laterally over the road surface by means of a stabilizing link (Fig. 4) which extends generally transversely of the machine and has its ends pivotallyy secured to the sub-frame 66 and the blade angle ||4.

The blade |05 is preferably not straight in plan but instead is of V-shape with its apex located near the longitudinal center line of the machine, as is clear from Fig. 4,'and with its two legs extending outwardly and rearwardly. These oblique legs serve to direct the paving composition toward the ends of the distributing blade |05 and tend to prevent it from accumulating to too great a depth near the center of the blade.

It may be desirable at times to distribute the paving material selectively between opposite ends of the blade |05, as when laying it in a sheet which is thicker at one side than at the other. To eifect such selective distribution, we provide a swinging gate |22 rigid with a vertical shaft |23 disposed at the apex of the distributing blade, the angular position of the gate |22 being controlled by irreversible power-transmission mechanism, such as worm gearing, disposed within a housing |24 supported from the distributing blade.

The V-shape of the distributor blade |05 permits the paving material to be distributed in a sheet having either a plane or a crowned upper surface, the slope of surface being varied as .desred by adjusting the distributor blade about an axis disposed transversely of the machine. To this end, one link, here shown as the link of each pair of generally parallel links supporting the distributor blade is made adjustable in length as by including it in a turnbuckle |30. By ad- -justment of these turnbuckles, the apex of the blade can be raised or lowered relatively to the ends of the blade to vary the amount of crown in the cross-section to which the paving material is distributed.

The adjustment of the swinging arms H5, which control the vertical disposition of the distributing blade |05, and the adjustment of the swinging gate |22 are preferably effected from an operators station at the rear of the machine. We may therefore provide on the rear end of the main frame an operators seat adjacent to which are a pair of hand wheels |36 and |31, which respectively control the two swinging arms H5, and a third hand wheel |38 which controls the position of the swinging gate |22. Preferably, the two hand wheels |36 and |31 are disposed in opposed relation on a common axis'extending transversely of the machine and are respectively connected through suitable shafts and gearing with the driving shafts of the worm gearing contained in the housings The hand wheel |38 is operatively connected to the driving shaft of the worm gearing located in the housing |24.

It may be desirable at times, and especially in cold weather to heat the binder contained in the tanks 95. For-this purpose, each of such tanks is shown as provided with a U-shaped flue |40 which extends longitudinally of the tank for substantially the whole length thereof and which has inlet and discharge openings located exteriorly of the tank at the front end thereof. The inlet opening of each flue |40 is disposed in line with a burner |4| mounted on the main frame in position to discharge hot gases into the flue. The burner |4| is supplied with fuel from a fuel-tank |42 and with air under pressure from a compressor |43.

As a practicable machine embodying our invention is of large dimensions and considerable weight, relatively great effort is required to effect some of the adjustments. The most notable of such adjustments are the steering of the front and rear wheels and the raising and lowering of the sub-frame 68 and the parts it carries. These adjustments we preferto effect by means of 'power derived from the engine under manual erably adjusted through irreversible power-transmission mechanisms located in the casings 80: and similar irreversible power-transmission mechanisms are preferably provided to effect steering adjustment of the front and rear wheels. Aa shown in the drawings, worm gearing' contained in a casing |25 mounted on the front cross member i3 is employed to control the position oi a horizontally swinging arm |26 connected by a drag link |26 with the arm 38 on one'of the front steering spindles. A similar arrangement is employed at the rear end of the machine, where worm gearing mounted in a casing |21 controls the position of the horizontally swinging arm |28 which is connected by a drag link |26 with the arm 33 on one of the rear steering spindles. Y y

For the purpose of effecting the indicated power adjustments, we have shown the gearing by which steering of the front wheels is effected, the gearing by means of which steering of the rear wheels is eiected, and the two sets of gearing which respectively control the two shafts 81 by means of,

which the sub-frame 68 is adjusted as connected respectively to rotatable driven elements |45 mounted in a control box |46. (See Figs. 1 and 3.) The control box also includes a rotatable driving element operatively connected through suitable power take-off mechanism and a shaft |41 with the engine 40. The connection of each of the driven elements |45 to the driving element is effected by a clutch controlled by a control lever |48. In addition to the four adjusting mechanisms mentioned above, the compressor |43 may also be driven through the control box |46.

In operation, the machine shown requires two operators, one located at the rear of the machine on the seat |35, as previously indicated, and the otherstationed on a platform (not shown) between the two tanks 95. The latter operator, by manipulating control levers |50 of the changespeed transmission mechanism 43 controls the speed of the vehicle. In addition he can, by manipulation of the levers |46 of the control box |46, steer the front wheels 20, raise orlower either side of the sub-frame 68 and the parts it carries, and control the operative connection between the engine 40 and the compressor |43. The rear-Wheel steering is conveniently under the control of the operator at the rear of the machine. For this purpose, there may be mounted near the operators station at the rear of the machine a steering lever operatively connected through suitable mechanism |5I' (see Fig. 1) with that control lever |46 of the gear box |48 which controla the connection of the irreversible power-transmission mechanism which effects steering movement of the rear wheels.

As the machine passes along the road, the gathering blades 82 gather loose aggregate on the surface of the sub-grade and move it inwardly so that it may pass between the vertical plates 86 into the pug-mill mixer 69, the aggregate being lifted into the mixer by the apron 8|. Preferably, the shafts of the pug-mill extend forwardly over the apron 8| and have inclined blades 'Il located above such apron, so that such blades will assist in moving the aggregate up the apron.

As it enters the pug-mill, the aggregate receives a-supply of binder'discharged from the nozzle 96, the amount of binder being proportioned to the aggregate by the means described in the aforesaid application of Floyd D. Wallace. 'I'he blades 1| of the pug-mill are inclined to cause the aggregate and binder to be moved rearwardly through the pug-mill as the shafts Ill rotate, the blades serving additionally to effect a thorough mixing of the aggregate and binder.

The thoroughly mixed paving composition is discharged from the rear end of the pug-mill in advance of the distributing blade |65 and is distributed between the opposite ends of such blades by the swinging gate |22 under the control of the operator at the rear of the machine. This operator also controls the vertical disposition of the distributing blade so as to distribute the paving composition in the desired cross-section.

By making the front and rear wheels independently steerable, it is possible for the operator at theY Vfront of the machine to direct it in a course such that the gathering blades 82 will be most effective in gathering loose aggregate while the operator at the rear of the machine can steer the rear wheels to control the lateral disposition of the sheet of ypaving material laid by the distributing blade |05. Broadly, the independent steering of front and rear wheels in a re-tread paver is the invention of William A. Cost alone. and is covered in a co-pending application illed by him on November 9, 1934, and bearing Serial No. 752,230.

When the machine is to be transported over the road without mixing and laying a paving composition, the shafts 8l are rotated to raise the sub-frame 68 and lift the gathering blades 82, plates 80, shoes |06, and distributor blade |05 free of the road surface. 'Ihe front ends of the shoes |06, when the sub-frame 66 is raised, are lifted by the draft-links |61, while their rear ends are lifted by chains |3| (Figs. 2 and 7) which extend between the sub-frame and shoes and which hang slack while the machine is operating to lay paving material.

We claim as our invention:

1. A re-tread paver for roads, comprising a wheel-supported frame, a pug-mill mixer carried by said frame, said mixer including a substantially horizontal longitudinal trough open at its forward end and one or more longitudinally extending rotatable shafts having helically inclined blades for moving material in said trough rearwardly, each of said blades having a radial length approximating the distance between its associated shaft and the bottom of said trough, and an apron sloping forwardly and downwardly at the forward end of said trough in position to engage aggregate on the road surface and elevate it into said trough as the paver moves along a road, at least one of said blades being disposed over said apron in position to engage aggregate thereon.

2. A re-tread paver for roads, comprising a frame; a pair of front supporting wheels and a pair of rear supporting. wheels for said frame; both said pairs of wheels being independently steerable; an engine mounted on said frame; a

driving connection from said engine to said iront and rear wheels; means carried by said frame for elevating aggregate from the road surface near the front end of the frame, mixing such aggregate with a binder, and discharging the mixture upon the road surface near the rear end of said frame; and a distributor -blade located in rear of the point at which such mixture is discharged.

3. A re-tread paver for' roads, comprising. a frame; a pair of front supporting wheels and a pair of rear supporting wheels for said frame; at

isis` disposed, vertically adjustable least one pair of said wheels being steerable; an engine mounted on said frame; a driving connection from said engine to said front and rear wheels; means carried by said frame for elevating aggregate from the road surface. mixing it with a binder. and'discharging the mixture upon the road surface; and a distributor blade located in rear of the point at which such mixture is discharged. fi 4 4. A re-tread paver for roads'r comprising a frame; a pair of front supporting wheels and a pair of rear supporting wheels for said frame; both said pairs of wheels being independently steerable; an engine.mounted on said frame; 'a driving connection from said engine to at least one pair of said wheels; frame for elevating aggregate from the road surface near the front end of thev frame, mixing such aggregate with a binder, and discharging the mixture upon the road surface near the rear end of .the frame; and a distributor bladelocated in rear of the point at which such mixture is discharged.4

5. A re-tread paver forroads, comprising a wheel-supported frame, a-mixer carried by said frame and having a longitudinally extending trough open-at both ends and means. within said trough for mixing and'movingrearwardlymaterial therein, an apron secured to the -front end of said'trough, said apron sloping forwardly and downwardly in position to elevate into thetrough of said mixer aggregate disposed on the road surfaceas'l the paver travels threalong. and. means for vertically adjusting the front end of said trough. v Y

6. A re-tread paver, comprising-a wheel-supe ported frame, a mixer carried by said frame and having a longitudinally extending trough open at both ends and means within said trough iur-mixing and moving rearwardly material therein, means for gathering aggregate disposed on the road surface and elevating it into said trough, said means including a pair of forwardly diverging blades connected with said mixerftrough, and means for independently adjusting vertically each side of the unit comprising said mixer trough and blades whereby the position of such unit about a longitudinal axis may be varied relative to the frame.

'1. A re-tread paver, comprising a frame, two laterally spaced supporting wheels mounted on said frame near the yfront en d thereof, a real` truck comprising a transversely extending axle member having wheels mounted near its opposite ends, means interconnecting said truckA and frame for relative angular movement about an axis disposed longitudinally of said frame, means carried by said frame for intermixing aggregate and binder, and a distributor blade for distributing the mixture discharged from said mixing means.

8. In a re-tread paver for roads, a transversely distributor blade generally V- ped in horizontal plan with rearwardly diyerging legs, a vertical vane pivotally supported from said blade and swingable about a vertical axis disposed near the apex of said blade, means for adjusting said vane about its axis, and means for discharging a paving composition upon the road surface in advance of said vane.

9. In a re-tread paver, a frame movable over the sub-grade surface to be paved, supporting wheels for said frame, a'pair of laterally-spaced, ground-.engaging shoes of considerable longitudinal extent loosely connected to said frame and free to move vertically relative thereto, a transand rear ends of the mixer means carried' by saidl verselydlsposed distributor blade, mechanisms interconnecting the ends of said distributor blade with said shoes respectively, saidl mechanisms being independently adjustable to vary the height of yeach blade-end, and means for discharging a paving composition on the road surface in advance of said distributor blade.

l0. In .aire-tread paver, a

a trough-like body extending longitudinally of said frame, said mixer body being open at its front end to receive material on the road surface and open at its rear end to discharge mixed materials, and means for independently adjusting the front i body relative to said frame. I

1l. In a re-tread paver.' a wheel-supported frame, a mixer carried thereby, an apron positioned to elevate aggregate from the road surface and to discharge it into said mixer, 'and means for independently adjusting opposite sides of said apron to vary the angular position thereof about an axis longitudinally to the. chicle.

1,2. In a re-tread paver, a wheel-supported frame, a mixer carried thereby, an apron positioned to elevate aggregate from the road surface and to discharge it into said mixer, a pair of gathering blades rigid. with said apron and diverging forwardly therefrom, and means for independently adjusting opposite sides of the unit consisting of said apron and gathering blades.

13. In a re-tread paver, a distributor blade for distributing a paving composition, said 'blade being of general V-shape in plan with rearwardly diverging legs, two blade-mounting members .s d laterally of the paver, a pair of substantally parallel links interconnecting each of said members with said blade, onelink of each pair being adjustable in length, and means for vertically adjusting said' blade.

14. In a re-tread paver, a distributing a paving composition, two bladel mounting members spaced laterally of the paver,

a pair of vertically spaced substantially parallel links interconnecting each of said members with Asaid blade, the point of attachment of the blade to each of the lower parallel links being below the top edge of the blade and the lower links being arched to clear the top edge of the blade, and means for vertically adjusting said blade.

l5. In a re-tread paver, a frame, wheels supporting said frame, an engine, a drivingl connection between said engine and at least-some of said wheels, a mixer supported from said frame in position to receive aggregate on the road surface as the paver is driven therealong, and means driven by said engine for adjusting said mixer relatively to said frame.

16. The invention set forth in claim l5 with the addition that said mixer includes a rotatable mixing element, and power-transmitting means including a flexible driving connection operatively interconnecting said rotatable element and said engine.

17. In a re-tread paver, a frame, wheels supporting said frame, an engine mounted on said frame, a driving connection between said engine and at least some of said wheels, a. mixer supported from said frame in position to receive aggregate on the road surface as the paver is driven therealong, means for adjusting said mixer relatively to said frame, said mixer having a rotatable mixing element, and power transmitting means including a exible driving connection distributor blade for wheel-supported i frame, a mixer carried by said frame and having operatively interconnecting said rotatable element and saidv engine. I

18. In a re-tread paver. a wheel-supported trame, a mixer positioned below said frame, said mixer being provided with an apron extending forwardly and downwardly in position to engage and elevate into said mixer aggregate disposed on the road surface, i'iexible tension elements supporting said mixerirom said frame. and a generally horizontal draft element having its rear end connected to said mixerand its iront end connected to said irame.

19. In a re-treadl paver, a wheel-supported frame. a mixer positioned below said trame, said mixer being provided with anapron extending forwardly and downwardly in` position to engage and elevate into said mixer aggregate disposed on the road surface. flexible tension elements supporting said mixer from said frame, and a drait element having its rear, end connected to said mixer and its front end connectedv to said frame. v

20. In a re-tread paver, a wheel-supported frame, a mixer positioned below said frame, said mixer being provided with an apron extending forwardly and downwardly in position to engage and elevate into said mixer aggregatedisposed on the road surface, ilexible tension elements supporting said mixer from said frame, and a rigid draft element having its rear end pivotaliy connected to said mixer on a horizontal transverse axis and its front end pivotally connected to said frame on two axes, one ot which is a horizontal transverse axis and the other of which' extends longitudinally of the i'rame. l

21. In a re-tread paver, a` wheel supported frame, a mixer, exible tension elements supeI porting said mixer from said frame, and means preventing lateral and longitudinal movement of the mixer relatively to the frame: said means comprising two rigid members pivotally connected to said mixer front and rear thereof and extending oppositely therefrom, said rigid members being pivotally connected to said trame.

22. In a re-tread paver, trame, a mixer, flexible tension elements supporting said mixer from said frame, and means preventing lateral and longitudinal movement of the mixer relatively to the frame.

' 23. In a re-tread paver, a distributor blade for distributing a paving composition, said blade being of general Vv-shape in plan and having rearwardly divergi'ng legamnsor bodily adjusting said blade vertically with@l movement of translation, and mechanism in addition to said means for rocking said blade about a horizontal transverse axis to vary the relative height of the center and ends of the blade.

24. A re-tread paver for roads, comprising an elongated frame; a pair of iront supporting wheels and a pair of rear supporting wheels for said frame, each oi said pairs of wheels being steerable independently oi. the other pair; an engine mounted on said frame: power-transmission mechanism operatively interconnecting said engine with said front and rear wheels; means carried by said frame for engaging aggregate on the road surface at a point near the front end of the frame, mixing such aggregate with a binder, and discharging the mixture near the rear end of the frame; and a distributor blade located in rear oi the point at which such mixture is discharged.

` A. COST.

1.1. lf 2* JOSEPH W. TLEY.

a wheel supported onhorisontal axes atthe

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