US1999189A - Road machine - Google Patents

Description

Aphll 39, 1995, c. A. GUSTAFSON ROAD MACHINE Filed June 15, 1932 3 SheetsSheet 1 IN V EN TOR.

CHRL H Gus-macaw w mw Apm'lli 3@, i935. c. A. GUSTAFSON ROAD MACHINE Filed June 15, 1932 5 Sheets-Sheet 2 S mF mm w m6 nn L M C ATTORNEY/- c. A. GUSTAFSON ROAD MACHINE Filed June 15, 1932 3 Sheets-Sheet 3 INVENTOR. CHRL F). Gusrn FSON atented Apr. 3b), i fi UWETED stares meant parent three Application June 115, 1932, Serial No. 617,289

53 Claims.

The present invention relates to road machines, and more particularly to a tool and mounting means therefor. The invention disclosed herein is primarily useful in connection with road maintainers having rubber tired wheels, particularly pneumatic tires.

Road maintaining machines of the type disclosed herein are adapted for use in finishing or refinishing the surfaces of roads, the earth-en gaging tool thereof being adapted to plane offv plane of movement so that a regular and even road surface is obtained. Such tools heretofore have been rigidly connected to the frame of the machine by lift links or screws whereby the depth of cut of the blade may be adjusted'and the entire weight of the machine is used to maintain the blade in its cutting position.

During operation, rubber tired wheels, particularly those provided with pneumatic tires, have a tendency to flex or bounce over rough sections of road. Any flexing movement of the tires causes the tool to be forced below the selected cutting plane thereof, while any bouncing action of the tires causes the tool to be lifted above such plane, so it is seen that with a rigid connection from the tool to the frame of the machine, rough sections of road will cause irregular contact of the tool with the surface of the road whereby a wavy or irregular surface is left. This undesirable feature has interfered materially with the successful use of automotive road machines and has limited particularly the speed of such machines, as the flexing and bouncing action increases with higher speeds.

llhis dimculty is overcome in the structure disclosed herein by the provision of anovel mounting means for theearth-engaging tool which provides a flexible, resilient connection between said tool and the frame of the machine while permitting adjustment of the tool to a desired depth or to a desired inclination. This novel. mounting means absorbs any movement of the frame due to the flexing or bouncing action of the tires and prevents transmission of such movement to the tool. Furthermore, the earth-engaging tool is (C11. iii-J56) permitted to have a substantially free, floating contact with the surface of the road, adjusting means being provided so that as much weight as desired may be used to press the tool into engagement with the surface of the road. Thus, 5 whether the road be dry and hard, or soft, the earth-engaging tool is adjustable to plane an even road surface at a selected depth. In addition, higher speeds of operation of the road machine are practicable whereby the time required to work a given stretch of road is reduced materially.

Another advantageous feature of the flexible, resilient tool support is that it provides a more effective escape for the tool if it encounters a solid obstruction during operation. As only the tool and circle assembly need be lifted, and not the entire machine, the danger of breakage during operation is practically eliminated.

Statement of invention It is an object of the invention to provide means in an automotive road machine for absorbing undesired movement of the frame to prevent such movement being transmitted to the tool.

Another object of the invention is to provide mounting means for an earth-engaging tool which permits a substantially free floating engagement therof with the surface of the road.

Another object of the invention is to provide mounting means for an earth-engaging tool whereby said tool has a controlled floating engagement with the surface of the road.

Another object of the invention is to provide adjustable means for varying the portion of the weight of an earth-engaging. tool which is car ried by the frame of the machine.

Another object of the invention is to provide means for varying the weight which presses an earth-engaging tool into contact with the surface of the road. 4

Another object of the invention is to provide mounting means for an earth-engaging tool which 'is readily adaptable to provide a flexible or a rigid mount therefor.

Another object of the invention is the provision of resilient mounting means for an earth-engaging total.

Another object of theinvention is the provision of flexible mounting means for an earth-engaging tool.

Another object of the invention is to provide mounting means for an earth-engaging tool which insures smooth, chatterless operation at relatively high rates of speed in road maintaining work.

Another object of the invention is to provideinfi'o means for disabling the resilient support whereby a rigid connection'is obtained from the tool to the frame.

Another object of the invention is the provision of improved adjusting means for an earth-engaging tool.

Other objects will appear as the description progresses.

Description of figures Fig. 1 is a side elevation of the machine.

Fig. 2 is a plan view of the front of the frame and the wheel support therefor.

Fig. 3 is a plan view of the tool and circle assembly.

Fig. 4 is a detail View.

Fig. 5 is a detail view.

Fig. 6 is a rear elevation of the tool and circle assembly taken on the line 6-6 in Fig. 3.

Fig. 7 is a view taken on the line 'I--'| in Fig. 6.

Fig. 8 is a side elevation of the tool and circle assembly.

DESCRIPTION or MACHINE Frame and supports therefor The frame of the machine is substantially symmetrical with respect to the longitudinal axis thereof and includes two side channels I0, I I (Figs. 1 and 2) which extend substantially the length of the machine and have a slight convergence toward the front end (Fig. 2). These side channels are connected by cross members and braces. In the front end of the machine bolster I2 is riveted to the forward ends of side channels I and II. Said bolster I2 is provided with centrally located journal I3 on the under side thereof which is adapted to receive a draft connection for the tool as described hereinafter. side of bolster I2 is casting I4 which has a pivotal connection (not shown) with front axle I5, and is provided with centrally located journal I6 on the upper side thereof opposite journal I3 in bolster I2 and adapted to receive said draft connection for the tool.

Front wheels I! (Fig. 2) are journaled on spindles integral with knuckles I8 which are pivotally mounted in the forked ends of front axle I and have steering arms I9 connected by adjustable rod 2I. Said wheels H are provided with suitable pneumatic tires. Right steering arm I9 has lateral extension 22 (Fig. 2) connected by drag link 23 (Fig. 1) to arm 24 which is operated by suitable steering mechanism enclosed in housing 26 (Fig. 2) Said steering mechanism is operated by shaft 21 (Figs. 1 and 2) which extends rearwardly to the operators station and is provided with a handwheel 28 (Fig. 1).

Near the front end hanger 29 (Figs. 1 and 2) is provided, the ends thereof being riveted to side channels I0 and II, respectively, suitable gussets serving to strengthen the connections. Brace rods 3I (Fig. 2) are secured at their forward ends to front axle I5 and converge rearwardly, having a joint pivotal mounting in bracket 32 (Fig. 1) which is secured to the under side of hanger 29.

At the rear end of the machine, side channels I0, II are secured to curved channel 33 by suitable brackets, said' channel forming a rear bumper.

Rear wheels 34, only one of which is shown, are mounted on a rear axle assembly which supports side channels I0 and II. Rear wheels 34, like front wheels I I, are provided with pneumatic tires. Said rear axle assembly is driven from mo- Bolted to the under tor 36, which is suitably supported in the frame, through clutching and transmission mechanism enclosed in housing 31 (Fig. 1) The drive therefor is controlled by gear shift lever 38 and a clutch pedal, not shown, located at the operator's station. Brake pedal 39 controls suitable braking means, not shown. I

By means of the above-described mechanism the operator is able to control the movements of the road machine.

Shaft M is constantly driven from motor 36 and transmits the drivetherefrom to reversible clutch means encased in gear box 42 and controlled by levers 43, only one of which is seen in Fig. l. Levers 43 control power operated adjusting means for the tool as more fully described hereinafter.

Tool support and mounting means therefor (100 series numerals) The tool and circle assembly, more specifically described hereinafter, is supported from side channels I0, II, by screw lift arms or-links I00, IOI, respectively (Figs. 1 and 6). Said links or arms I00, IOI, are identical in construction and mounting, and only one of such members need be described.

Lift link IOI (Fig. 1) is raised and lowered by suitable gearing mounted in housing I02, and driven by extensible telescoping shafts I03, universally connected thereto and to reversible clutch means in gear box 42. Said housing I02 is pivotally mounted in fork I04, the hub of which is journaled in apertured boss I06 of bracket I01, secured to side channel II. Thus it is seen that lift link MI is supported universally on the frame of the machine. Lift link I 00 is similarly supported.

Lift link IOI is provided with a flexible, resilient connection to'the tool and circle assembly. At its lower end, lift link IOI, together with cap III (Figs. 3 and 6 to 8) secured thereto by bolts H2, form a bearing socket which receives ball I I3 secured to cross bar I I4 near the outer end thereof. Cross bar I I4 is pivotally secured at its inner end to the upright flange of rear cross angle IIG by bolt II1. Cross angle IIB forms a part of the circle supporting frame to be described hereinafter. The outer end of the crossbar H4 is bent forwardly and is provided with apertured boss I23 (Figs. 3 and 6 to 8) which receives bolt I24. Said bolt I24 extends downwardly through an aperture in the horizontal flange of angle H6 and is provided with nut I26 and washer I2'I (Figs. 6 and 8). Compression spring I28 surrounds said bolt I24 and is held between washer I21 and the horizontal flange of cross angle IIS. From the foregoing description it is seen that bar I I4 is universally connected intermediate its ends to lift link MI, is pivotally connected at one end to the circle supporting frame, and has a. resilient or elastic connection therewith at its other end. Thus cross bar H4 and the end of cross angle I I6 adjacent thereto each have corresponding connecting stations whereby a resilient, flexible tool mounting means is provided, said bar and said angle comprising a pair of members having offset or spaced pivotal and resilient connections.

Bar I I4, it will be observed from Fig. 6, acts as a lever which, because of its intermediate pivotal connection with lift link I0 I, provides for indirect supporting of the earth-engaging tool structure on the resilient means or spring I28. As a result, the resilient means, which resiliently opposes the weight of the tool structure and fioatingly supports the structure with the tool in yiel en gagement with the ground, has imposed thereon only a portion of the tool structure weight which would otherwise be normally imposed thereon if the tool structure were to be directly supported on or suspended from the resilient means. Thus, for any given Weight of the tool structure, a lighter and smaller size spring may be employed, than would otherwise be permitted by direct supporting of the tool structure on the spring; and at the same time wear on the parts is reduced to a minimum.

Means are provided for limiting the oscillation of cross bar llll with respect to the.circle supporting frame. lJ-shaped bracket l2?) (Figs. 1, 6 and 8) extends over cross bar lll near its outer end and has itsgends bolted to the vertical and horizontal flanges of cross angle lit, respectively. Thus the oscillatory movement of the outer end of cross bar lid is limited in extent by bracket lid and cross angle lid.

Means are provided for disabling the flexible, resilient connection between lift link llll and the tool and circle assembly. Aperture ldl in cross bar lid, and aperture H32 in cross angle llt, are alined when said cross bar l it is moved to a horizontal position whereby a bolt inserted through said apertures will provide a rigid connection from lift link ldl to cross angle llfi. Thus additional connecting stations are provided on cross bar lid and the adjacent end of cross angle lid whereby a rigid tool support may be provided.

Lift link ltd (Figs. 3 and 6) is similarly connected to the left end of cross angle lit, having a ball and socket connection lilt with cross bar 0377. Cross bar l3? is pivotally connected at its inner end to said cross angle l l6 by bolt lid, and is provided at its outer end with apertured boss li-ld. Bolt l M passing through said aperture and through cross angle H6 is provided with nut M2 and washer i 33. Compression spring lll i surrounds bolt l ll and is held between washer l 33 and cross angle lit. U-shaped bracket M6 similar to bracket l29 serves to limit oscillation of cross bar I37. Aperture Mill in bar 8371, and aperture M8 in angle i it, provide means for disabling the resilient, flexible connection between lift link Hill and the tool and circle assembly.

Thus it is seen that lift links Hm, llll are resiliently and flexibly connected to the tool supporting frame whereby movement of the frame of the machine within the limits 'of oscillation of cross bars ll l, l3l is not transmitted to the tool. Moreover by adjusting said lift links any part or all of the weight of the tool and circle assembly can be supported from the frame of the machine so that the tool is adjustable to have substantially free-floating contact with any type of road surface. In addition the weight which presses the tool into engagement with the road surface may be varied.

Cross angle l l6 forms a part of the circle supporting frame comprising said cross angle, drawbars ltl, Hi2 and yoke lot) (Fig. 3). Brackets lfi l, ltt are bolted to cross angle M6 and the respective rear ends of drawbars l lil, ltd, while yoke lot is bolted to said drawbars intermediate their ends. Circle I85, more fully described hereinafter, is revolvably mounted on ledges formed in brackets lot, I66, and at the forward corners of yoke N33. Bolts lt'l (Fig. 3) provide adjusting means for preventing play between said circle and the supports therefor.

Said circle supporting frame is provided with a universal draft connection to the frame of the machine. Drawbars ltl, ltf, converge forwardly and are joined at their forward ends by connection l t8 (Figs. 1 and 2) bolted thereto. Boltllid is journaled in connection ltd and is provided with apertured head lid which receives pin ill, having its ends journaled in universal connection ll'l. Universal connection ll? is pivoted in journals l3 and lit in bolster l2 and casting ill, respectively. Thus drawbars ltl, llil can pivot in a vertical plane about the axis of pin Hi, can pivot in a horizontal plane about the axis of journals it, it, and can rotate about the axis of bolt llbd. It is seen, therefore, that the tool and circle assembly is capable of a limited universal movement about a. point at the intersection of the axes of pin ill and universal connection H2 as a center.

To summarize the movements of which the circle is capable, they are, an arcuate movement in a horizontal plane about the vertical axis of journals l3, l6; an arcuate movement in vertical planes containing said axis; oscillation about the axis of bolt M9; and oscillation of the circle about its center. The desired tool ajdustment is usually obtained by combinations of these movements.

, Arcuate movement of the circle in the horizontal plane is obtained by shifting the center of the circle. This adjustment is made through link l'ltl (Figs. 1, 3 and 6 to 8), the lower apertured end of which is pinned on stud ll'll l (Figs. 3 and 7) which is welded to cross bar lid. A similar stud H is provided on cross bar ill. The upper bent end of link i713 (Fig. 1) is received in apertured lug l'lb depending from rack Hill which is slidably mounted on T-bar lid secured to the frame. Rack l'l'll is engaged by pinion l'lll fast on shaft ltd. Said shaft ltll is driven by gearing mounted in housing l8l which is driven by extensible telescoping shafts W2, universally connec'ted thereto, and to reversible clutch mechanism in gear box lll. Link lid by being connected to bar lid is unable to transmit slight frame movements to the circle because of the resilient connection between bar llll and angle l it, previously described.

Circle ltfi is also adjustable about its center, and for this purpose, rack M3 (Figs. 3 and 7) is provided on the horizontal flange thereof. A pinion, notshown, engages said rack ltd and is driven by gearing in housing lull (Fig. 1) mounted on yoke lull. Said gearing is driven by reversible clutch means in gear box d2 through extensible telescoping shafts lab universally connected thereto.

The remaining movements of the circle, namely, arcuate movement in vertical planes containing the axis of journals l l, l d, and oscillation about the axis of bolt ltd, are obtained by adjustments of lift links ltll, lll.

The tool, comprising the blade, circle and circle supporting framework, considered as a unit, is

connected to the main frame of the machine asfollows: a front support and draft connection at universal H2, and three adjustable supports, namely, lift links ltd, ill, and center shift link H3. These three adjustable supports all have resilient connections with the tool unit, so that undesirable movements of the frame are not transmitted to the tool.

Means are provided for supporting a tool from the circle, and while a preferred form of tool is disclosed herein, namely, a multiple blade scraper, other tools such as a single grading blade, or a scarifier, can be equally well secured to the clrcl road in any vertically adjusted position of the' and a leveling or distributing blade.

which is flexibly and resiliently supported from the frame.

Circle I86 may be formed by casting or from a single piece of angle bent into a circle. Beam I81 (Fig. 1) is provided with central portion I88 bent into a semi-circle of substantially the same radius as the circle; said central portion I88 encompasses approximately one-half of circle I86 and is riveted thereto. End portions I89, I99 (Fig. 6) of the beam extend tangentially from the circle and downwardly, havinglower apertured ends for connection to the tool. i

In order to rigidly connect the end portions of the beam to the circle, upright angles I9I, I92 (Figs. 6 and 7) are riveted to respective end portions I89, I 99, and to cross angle I93. Brackets I94, I95, are riveted to said angle I93 and to circle I86. In addition, the lower ends of angles I9I, I92, are rigidly secured by gussets I96, I91, to the respective lower ends of inclined braces I98, I99, the upper ends of which are riveted to cross angle I93.

Tool construction (200 series numerals) Tool 299 comprises a multiple blade assembly The multiple blade consists of cross angles 29I, 292, (Figs. 1, 3 and 8,) to the upright flanges of which smaller cross angles 293, 294, are riveted. A plurality of parallel, equally spaced angles 296 (Figs. 3 and 6) are'riveted to the horizontal flanges of angles 29I, 292, being perpendicular thereto. A blade 291 is bolted to each of said angles.296.

Tool 299 is pivotally connected at the rear edge thereof to end portions I89, I99 of beam I81, and is provided with an adjustable connection to the front of the circle whereby the angle between the circle and the multiple blade may be varied.

Brackets 2II, 2I2 (Fig. 6) are riveted to the vertical flange of cross angle 2M and have apertured ears 2I3, 2I4, respectively. Said brackets are adjacent respective end portions I89, I99, of beam I 81 and bolts 2 I6, 2 I I provide a pivotal connection therebetween. Said bolts 2I6, 2I1 are journaled in the apertures in ears 2I3, 2 I4, and in said end portions I89, I99 by tapered washers 2 I8, 2I9, respectively.

Forwardly converging angles 22 I, 222 are bolted to angles 293, 299, and have shorter bracing angles 223, 224 (Figs. 3 and 6) riveted thereto, The forward ends of angles 22I, 222, extend past angle 294 and are bolted to bracket 226 (Figs. 1, 5, 6 and 8). The central portion of bracket 226 forms with cap 221 (Fig. 8) bolted thereto, a socket which receives ball 228 formed on the lower end of screw 229 having nut portion 239. Said screw 229 has threaded engagement with cylindrical housing 23I which is pivoted on pin 232 (Fig. 5) journaled in bracket 233 bolted to beam I68 and circle I86. Bolt 234 provides means for tightening housing 23I on screw 229 to maintain the adjustment thereof. Said nut portion 239 provides a means for adjusting screw 229 to vary the'angle between the multiple blades and the circle whereby said multiple blade may be adjusted to a plane parallel to the surface of the blade and circle.

The leveling or spreader blade is adjustably I 242 which are pivoted on pins 243, 244, respectively, near the front of said pairs of angles. Said arms 24I, 242, bend downwardly at their rear ends (Fig. 8) and respective pairs of brackets, 246, 241, (Figs. 3 and 8) are riveted thereto and to cross angle 248 to which leveling blade 249 is bolted.

Adjustable connecting means are provided whereby blade 249 can be moved in an are about the axis of pins 243, 244, so that the height of the leveling blade with respect to the surface planed by the multiple blade may' be adjusted. There is a connecting means associated with each of arms 24I, 242, and as said connecting means are identical in construction, only one will be described in detail.

Brackets 241 bolted to angle 248 (Fig. 8) near the right end thereof are provided with apertured extensions. 25I which receive pin 252 (Figs. 6 and 8) on which bolt 253 is pivoted. Bolt 253 (Fig. 4) extends within cylindrical housing 254, said housing having a central portion 256 of smaller diameter with which said bolt has threaded engagement. Collars 251, 258, are welded on housing 254 to position housing 254 for rotation on its support 259. Support 259 is provided with opposite integral trunnions 26I (Figs. 3 and 8) journaled in arms 262, 263 welded to angles 238, 239, respectively. Bolt 264 holds said arms 262, 263 in engagement with said trunnions 26 I.

Adjusting handle 266 (Figs. 4 and 8) is pivotally mounted on bolt 261, journaled in ears 268 integral with collar 251. Handle 266 when moved to horizontal position is used to rotate housing 254 to raise or lower screw 253. When said handle is moved-to its vertical position, it lies between fingers 269 integral with collar 259 whereby housing 254 is locked against rotation, and the adjusted height of leveling blade 249 is maintained.

A similar adjustable connecting means, indicated generally at 21I in Fig. 3, for the leveling blade is provided near the left end thereof; said adjustable connecting means 21I is identical in construction with the one heretofore described.

While my invention has been shown and described in its preferred embodiment, it is to be understood that my invention may be embodied in other forms, and that the scope thereof is to be limited only by the appended claims.

I, therefore, claim as my invention:

1. In a road machine, a frame, a steerable front wheel support therefor, a driving rear wheel support therefor, a motor mounted on said frame, a tool supporting frame comprising drawbars having a universal connection with said frame, a rear cross member, brackets connecting said member to said drawbars, and a yoke bolted to said drawbars intermediate their ends, apertured brackets secured to said cross member near each end thereof, cross bars passing through each bracket and pivoted at their inner ends to said cross member, each cross bar having an apertured boss at its outer end, bolts passing through said apertured bosses and alined apertures in said cross member, compression springs held between nuts on said bolts and said cross member, lift arms adjustably mounted on said frame, each having a pivotal connection-with one ofsaid cross bars, a circle revolvably mounted in said first named brackets and said yoke, and an earth engaging tool supported from said' circle.

2. In a road machine, a frame, a front support therefor, a rear support therefor, an earth-engaging tool, a tool supporting frame, a draft connection from said first frame to said tool supporting frame, supports for said tool supporting frame adjustably mounted on opposite sides of said first frame, and connections "from said supports to said tool supporting frame each comprising a bar pivotally connected to the associated support and having a pivotal connection and a spring connection with said tool supporting frame.

3. In a road machine, a frame, a front support therefor, a rear support therefor, an earth-engaging tool, a tool supporting frame, a draft connection from said first frame to said tool supporting frame, supports for said tool supporting frame adjustably mounted on opposite sides of said first frame, connections from said supports to said tool supporting frame each comprising a bar pivotally connected to the associated support, a pivotal connection between said bar and said tool supporting frame, a spring connection between said bar and said tool supporting frame, and means on said tool supporting frame for limiting movement of said bars.

4. In a road machine, a frame, a front support therefor, a rear support therefor, a tool,.means for supporting said tool from said frame comprising a pair of lift arms adjustably mounted on said frame, connections from said arms to said tool, each connection including a member pivotally connected to the associated lift arm, a pivotal connection between said 'member and said tool and a resilient connection between said member and said tool limiting relative pivotal movement between said member and said tool about the axis 'of said pivotal connection.

5. In a road machine, a frame, supports therefor, a tool, a draft connection from said frame to said tool and a flexible connection between said frame and said tool including a bar having a pivotal connection at one end to said tool and an elastic connection thereto at the other end.

6. In a road machine, a frame, supports therefor, a tool including a cross member having a plurality of connecting stations at each end, adjusting means on said frame including a pair of lift arms, a connecting member associated with each lift arm and having connecting stations corresponding to the connecting stations on the adjacent end of'said cross member, and means for establishing a connection between selected corresponding stations on said cross member and said connecting members, certain pairs of said stations being adapted with said connection establishing means to provide a flexible support for said tool and other pairs of said stations being adapted with optional connection establishing means to provide a rigid support for said-tool.

'7. In a road machine, a frame, supports therefor, a tool, a yielding connection between said tool and said frame, and means for rendering said yielding connection rigid.

8. In a road machine, a tool support, a tool including planing means having a plurality of cutting edges, means for adjusting the depth of cut of said planing means, and means for maintaining said cutting edges parallel to the finished surface of the road, comprising an internally threaded housing pivotally secured to said tool support and a bolt having threaded engagement with said housing and universally connected to said tool, said maintaining means being positioned between said tool and said tool support and being subjected to tension or compression stresses only.

9. In a road machine, a tool support, a tool including planing means having a plurality of cutting edges, means for adjusting the depth of cut of said planing means, and means for maintaining said cutting edges parallel to the finished surface of the road, consisting of a member pivoted to said support and a second member pivoted to said tool, said members having thread-- surface of the road, comprising an internally threaded housing pivotally secured to said tool support and a bolt having threaded engagement with said housing and universally connected to said tool, and means including said housing for clamping said bolt in adjusted position.

11. In a road machine for planing and resurfacing a road duringtraverse thereof, a tool support, a tool frame, planing means and distributing means connected to said tool frame, means to adjust said planing means to a position parallel withthe finished surface of the road including an internally threaded housing depending from said support and a screw pivoted to said frame and having threaded engagement with said housing, and means to adjust said distributing means to create a road surface in a selected plane including a journal on said frame, a second housing rotatably mounted in said journal and having internal threads, a bolt pivoted to said distributing means and having threaded engagement with said second housing.

12. In a road machine for planing and resurfacing a road during traverse thereof, a tool support, a tool frame, planing means mounted on said frame, distributing means pivotally connected to said frame means to adjust said distributing means to create a road surface in a selected plane including a journal on said frame, a housing rotatably mounted in said journal and having internal threads, a bolt pivoted to said distributing means and having threaded engagement with said housing.

13. In a road machine, a tool frame, a tool.

means for adjusting said tool relatively to,said

frame comprising a support pivoted in said frame, a member journaled in said support and having a handle, a second'member pivoted to said tool and having threaded engagement with said first member for adjustment with respect thereto, and means comprising said support and said handle for locking said members in adjusted position.

14. In a road machine, a frame, front and rear supports therefor, an earth-engaging tool, a tool supporting frame, a draft connection from said first frame to said tool supporting frame, supports for said tool supporting frame adjustably mounted on opposite sides of said first frame, and means connecting said supports to said tool supporting frame, each connecting means comprising a member pivotally connected to the as-.

sociated support and having a pivotal connection and a resilient connection with said tool supporting frame.

15. In a road machine, a frame, front and rear supports therefor, an earth-engaging tool, a tool supporting member, a draft connection from said frame to said tool supporting member, supports for said toolsupportingmemberadjustablymounted on opposite sides of said frame, and means connecting said supports to said tool supporting member, each connecting means comprising a connecting member pivotally connected intermediate its ends to the associated support and having a pivotal connection at one end, anda resilient connection at the other end with said tool supporting member.

16. In a road machine, a frame, front and rear supports therefor, an earth-engaging tool, a tool supporting member, a draft connection from said frame to said tool supporting member, supports for said tool supporting member adjustably mounted on opposite sides of said frame, and means connecting said supports to said tool supporting member, each connecting means comprising a connecting member pivotally connected to the associated support and having a pivotal connection and a resilient connection with said tool supporting member.

1'7. In a road machine, a frame, front and rear supports therefor, an earth-engaging tool, a tool supporting member, a draft connection from said frame to said tool supporting member, supports for said tool supporting member adjustably mounted on opposite sides of said frame, means connecting said supports to said tcml supporting member, each connecting means comprising a connecting member pivotally connected to the associated support and having a pivotal connection and a resilient connection with said tool supporting member, and means for limiting movement of said connecting members with respect to said tool supporting member.

18. In a road machine, a frame, a front support therefor, a rear support therefor, a tool, means for supporting said tool from said frame comprising a pair of lift arms adjustably mounted on said frame, connections from said arms to said tool, each connection including a member pivotally connected to the associated lift arm, a pivotal connection between said member and said tool and an elastic connection between said member and said tool, said elastic connection resisting relative oscillatory movement of said member and said tool about the axis of said pivotal connection.

19. In a road machine, a fram a front support therefor, a rear support therefor, a tool, adjustable means for supporting said tool on said frame, and connecting means from said supporting means to said tool, comprising a member having a pivotal connection with said supporting means, andspaced connections to said tool, one

I of said spaced connections being resilient, the

other of said spaced connections being pivotal.

20. In a road machine, a frame, supports" therefor, a tool, a draft connection from said frame to said tool, and means for supporting said and means connecting said members for relative pivotal movement comprising spaced connections therebetween, one of said connections being flexible and the other of said connections being pivotal.

22. In a road machine, a frame, supports therefor, a tool, a draft connection from said frame to said tool, means for supporting said pivotal movement comprising spaced connections therebetween, one of said connections being flexible and the other of said connections being pivotal, and means for limiting relative pivotal .movement between said members.

23. In a road machine, a frame, supports therefor, a tool, a draft connection from said frame to said tool, means for supporting said tool from said frame including a pair of members, and means connecting said members for relative pivotal movement comprising spaced connections'therebetween, one of said connections being flexible and the other of said connections being pivotal, and optional means for preventing relative pivotal movement of said membets. 1 24. In a road machine, a frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a draft connection from said frame to said tool, supports for said tool adjustably mounted on said frame, and means for connecting said supports to said tool, each connecting means having a pivotal connection with the associated support, a pivotal connection with said tool, and a resilient connection with said tool. all of said connections being separated.

25. In a road machine, a frame, a front support therefor, a rear support therefor, a tool, adjustable meansfor supporting said tool on said'frame, and connecting means from said supporting means to said tool, comprising a member having a pivotal connection with said supporting means, and spaced connections to said tool, one of said spaced connections being resilient, another of said spaced connections being pivotal, and a third of said spaced connections providing an optional rigid support for said tool.

26. In an automotive road machine, a frame,

resilient front supports for said frame, resilient rear supports for said frame, an earth-engaging tool, means for supporting said tool resiliently from said-frame, comprising a pair of members, a pivotal connection between said members, and a resilient connection between said members spaced from said pivotal connection, said supporting means absorbing vibration of said frame to prevent transmission thereof to said tool. 27. In an automotive road machine, a frame, resilient front supports for said frame, resilient rear supports for said frame, an earth-engaging tool, means for supporting said tool resiliently from said frame, comprising spaced pivotal and resilient connections, said supporting means absorbing vibration of said frame to prevent. transmission thereof to said tool.

28. In a roadmachine, a frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a draft connection from the front end of said frame to said tool, means for supporting said tool adjustably from said frame, comprising means for adjusting said tool vertically with respect to said frame, and means for adjusting said tool laterally with respect to said frame; said supporting means including resilient connections between said tool and said frame for absorbing vibrations of said frame to prevent transmission thereof to said tool, said adjusting means acting through said resilient connections.

29. In a road machinaa frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a draft connection from the front end of said frame to said tool, means for supporting said tool adjustably from said frame, comprising means for adjusting said tool vertically with respect to said frame, means for me ian usting said tool laterally with respect to said frame; said supporting means including resilient connections between said tool and said frame for absorbing vibrations of said frame to prevent transmission thereof to said tool, said adjusting means acting through said resilient connections, and means for optionally disabling said resilient connections whereby a rigid connection is provided from said frame to said tool in any adiusted position thereof.

30. In a road machine, a frame, front supports for said frame, rear supports for said frame, an

/ earth-engaging tool, a draft connection from the front end of said frame to said tool, means for supporting said tool adjustably from said frame.

comprising means for adjusting said tool verti-' cally with respect to said frame, means for adjusting said tool laterally with respect to said frame; said supporting means including a pair of members, and pivotal and resilient connections between said members for absorbing vibrations of said frame to prevent transmission thereof to said tool, whereby said tool has a floating engagement with the surface of the road;

3l.'In a road chine, a frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a draft connection from the front end of said frame to said tool, means for supporting said tool adjustably from said frame, comprising means for adjusting said tool vertically with respect to said frame, and meansv 32. A unitary automotive road machine, comprising a frame, resilient front supports for said frame, resilient rear supports for said frame, an earth-engaging tool, a tool supporting member, a draft connection from said member to said frame, lift devices on said'frame, and resilient connections from said lift devices to said member, said resilient connections supporting a part of the weight of said tool and said tool supporting member during operation of said machine in maintaining road surfaces.

33; In a road machine, a frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a tool supporting member, a draft connection from said tool supporting member to said frame, lift devices on said frame, and resilient connections from said lift devices to said member, including'resilient elements, said elements resisting upward movement only of said lift devices.

34. In a road machine, a frame, front supports for said frame, rear supports for said frame, an earth-engaging tool, a tool supporting member, a draft connection from said tool supporting member to said frame, lift devices on said frame, resilient connections from said lift devices to said member, and means for adjusting said tool laterally with respect to said frame including 'a shift lini; connected to one of said resilient connections.

earth-engaging tool, a tool supporting member, a draft connection from said tool supporting member to said frame, lift devices on said frame, resilient connections from said lift devices to said 35. In a road machine, a frame, front supports for said frame, rear supports for said frame, an

,member, each connection including an element pivotally and resiliently connected to said member, and means for adjusting said tool laterally with respect to said frame including a link connected to one of said elements.

36. In a road machine, a frame, ground supports for said frame, an earth-engaging tool, a tool supporting member, a draft connection from. said frame to said member, second and third members, each of said second and third members having a pivotal and a resilient connection with said first member adjacent the respective ends thereof, a pair of lift devices mounted on said frame connected said second and third members respectively, and means for adjusting said bers respectively, and means for adjusting said tool laterally with respect to said frame including a shift link adapted for optional connection to said second member and said third member.

38.. In a road machine for planing and resurfacing a road during traverse thereof, an earthengaging tool comprising a'plurality of cutting edges lying in a plane, wheeled supports for said tool, and connecting means from said tool to said supports including a member having horizontally spaced pivotal and resilient connections with said tool.

39. In a road machine for planing and resurfacing a road during traverse thereof, an earthengaging tool comprising a plurality of cutting edges lying in a plane, front and rear supports for said tool, and connecting means from said tool to said supports comprising a pair of members,

a pivotal connection between said members, and a resilient connection between said members spaced porting said edges, wheeled frame means for supporting said members for mobility, and resilient connections between said frame member and said frame means, each connection including a pair of members pivotally and resiliently connected at spaced points.

41. In a road machine, a tool support, a tool including planing means having a plurality of cutting edges, means for adjusting the depth of cut of said planing means, and means for maintaining said cuttingedges parallel to the finished surface'of the road, consisting of a member pivoted to said support, a second member pivoted to said tool, said members having threaded engagenected to said tool and said support for maintaining said cutting edges parallel to theed surface of the road, comprising an internally gagement therewith, and means including said housing for clamping said housing and said bolt in adjusted position.

43. In a road machine, a frame, supports fo said frame, a ground-engaging tool, means for movably connecting said tool to the frame whereby contact of the tool with the ground is effected solely by the weight of said tool, resilient means acting in a direction to oppose the weight of said tool, and means for rendering said resilient means ineffective or placing a predetermined adjustment thereon while maintaining said movable connection, to compensate for varying conditions of ground surface.

44. In a road machine adapted for planing and resurfacing a road during traverse thereof, a frame, supports for said frame, an earth-engaging tool comprising a plurality of cutting edges lying in a plane, means for supporting said tool from said frame for vertical and lateral adjustment with respect thereto, and resilient connections between said supporting means and said tool acting in a direction to oppose the weight of said tool.

45. In a road machine adapted for planing and resurfacing a road during traverse thereof, a frame, resilient supports for said frame, an earthengaging tool comprising a plurality of cutting edges lying in a plane, means for supporting said tool from said frame for vertical and lateral adjustment with respect thereto, and resilient connections between said supporting means and said tool for absorbing vibrations of said frame to prevent transmission thereof to said toolfwhereby said tool has a floating engagement with the surface of the road.

46. In a road machine adapted for planing and resurfacing a road during traverse thereof, a frame, resilient supports for said frame, an earthengaging tool comprising a plurality of cutting edges lying in a plane, means for supporting said tool from said frame for vertical and lateral adjustment with respect thereto, means for movably connecting said tool to said supporting means whereby contact of the tool with the ground is effected solely by the weight of said tool, resilient means acting in a direction to oppose the weight of said tool, said resilient means being adjustable to support varying portions of the weight of said tool while maintaining said movable connection, to compensate for varying conditions of ground surface.

47. In a road machine, a frame, supports for said frame, an earth-engaging tool, a draft connection from said frame to said tool, and means for supporting said tool from said frame for vertical and lateral adjustment with respect thereto, said supporting means including resilient elements, all said resilient elements acting only in a direction to oppose the weight of said tool, and absorbing vibrations of said frame to prevent transmission thereof to" said tool.

48. In a road machine, a frame, supports for 'said frame, a tool, a tool supporting member, a

plurality of connecting stations on said member, means for supporting said tool supporting member from said frame, including a connecting member having connecting stations corresponding to said connecting stations on said tool supporting member, and means for establishing a connection between selected corresponding stations on said tool supporting member and said connecting member, certain of said stations being adapted with said connection establishing means to provide a flexible support for said tool supportin member and said tool. I

49. In a road machine, a frame, supports for said frame, a tool, a toolsupporting member, a plurality of connecting stations on said member, means for supporting said tool supporting member from said frame, including a connecting member having connecting stations correspond-- ing to said connecting stations on said tool supporting member, and means for establishing a connection between selected corresponding stations on said tool supporting member and said connecting member, certain pairs of said stations being adapted with said connection establishing means to provide a flexible support for said tool supporting member and said tool, and other pairs of said stations being adapted with optional connection establishing means to provide a rigid supfor limiting such relative movement.

51. In a road machine, a frame, supports therefor, a tool, a tool supporting member, meansfor supporting said tool supporting member on said frame, and connecting means from said supporting means to said tool supporting member, comprising a connecting member movably connected to said supporting means and to said tool supporting member, and resilient -means controlling relative movement of said connecting member with respect to said tool supporting means, said resilient means acting only to oppose the weight of said tool supporting member and said tool.

52. In a road machine, an earth-engaging tool structure, resilient means opposing the weight .of said structure for resiliently supporting said structure with ,the tool in floating engagement with the ground, and means for imposing on said resilient means only a portion of the structure w;ight which would otherwise be normally imposed thereon.

53. In a road machine; an earth-engaging tool structure; lift means for said structure; resilient means opposing the weight of said structure for resiliently supporting said structure with the tool in floating engagement with the ground; and leverage mechanism cooperating with said lift means, said resilient means and said structure for imposing on said resilient means only a portion.

of the structure weight which would otherwise be normally imposed thereon. I

' CARL A. GUSTAFSON.

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