US2432683A - Road roller wheel wobbling structure - Google Patents

Description

Dec. 16, 1947. J. R. RITCHIE ROAD ROLLER WHEEL WOBBLING STRUCTURE Filed Nov. 13, 1944 3 Sheets-Sheet 1 Invento JOHNR-RITCHIE Attor-nzg.

Dec. 16, 1947. J. R. RITQHIE ROAD ROLLER WHEEL WOBBLING STRUCTURE Filed Nov. 15, 1944 3 Sheets-Sheet 2 Inven'bor- 1 Joan R. Rn-c HIE Attorney.

Dec. 1 1947. J. RITCHIE I 432,683

ROAD ROLLER WHEEL WOBBLING STRUCTURE Fil ed Nov. is, 1944 a Sheets-Sheet a I? J24: 49 I JoHN RRnTcme fitter-r12 5 Patented Dec. 16, 1947 UNITED STATES PATENT OFFICE ROAD ROLLER WHEEL WOBBLING STRUCTURE 12 Claims.

This invention relates to a roller for compacting roads and rolling the surfaces of roads and while the invention could be applied to various types of road rollers it is designed particularly for'use with a roller having series of wheels arranged side by side and preferably equipped with pneumatic tires.

Road rollers having one or more series of wheels equipped with pneumatic tires have been found to be very successful and efficient in compacting roads and in finishing road surfaces. In practice it has been found desirable to have some means for oscillating or wobbling the wheels so that they do not run in a straight line. With such a structure the formation of rectilinear ruts or tracks is avoided and a more uniform surface is secured.

It is an object of this invention to provide a novel, simple and efficient means for oscillating or wobbling the Wheels of a road roller as it is pulled orpropelled along the road.

It is a further object of the invention to provide a road roller having a frame member, an axle mounted in said frame member, a plurality of wheels carried on said frame member and means for moving said frame member from side to side about a vertical axis for oscillating said wheels.

It is another object of the invention to provide a road roller comprising a frame member, an axle mounted in said frame member, a plurality of wheels carried on said axle, a draw bar adapted to-be attached at its front end to a tractor, means connecting said frame member and draw bar and means operated as said road roller is progressed on said wheels for swinging said draw bar and member laterally to oscillate said Wheels.

It is also an object of the invention to provide such a road roller as set forth in the preceding paragraph in which one or more cams are provided rotatable about the axis of said axle and engaging a member adjacent the rear end of said draw bar for moving, the same and said member.

It is more specifically an object of the invention to provide a road roller comprising a frame member having a forwardly projecting portion, an axle mounted in said member, a plurality of wheels carried on said axle, a draw bar adapted to be swingingly connected at its front end to a tractor, means connecting said portion and draw bar for relative movement about a vertical axis, a cam roller carried adjacent the rear end of said draw bar and cams on adjacent wheels disposed respectively at either side of said cam roller for moving the same and said draw bar from side to side and oscillating said member and wheels.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:

Fig. 1 is a horizontal section taken substantially on line l--! of Fig. 4 and showing a large portion of the road roller in plan;

Fig, 2 is, a plan view of a portion of' the road roller, certain parts being broken away and others shown in horizontal section taken substantially on line 22 of Fig. 4;

Fig. 3 is a partial plan view showing the mounting of a cam roller used;

Fig. 4 is a view mostly in vertical section on lines 44 of Fig. 1; a. portion being shOWn in side elevation;

Fig. 5 is a partial view partly in side elevation and partly in vertical section taken on line 4-4 of Fig. 1;

Fig. 6 is a partial plan view of the device, a part being shown in horizontal section taken substantially on line 6-6 of Fig. 4; and

Fig. 7 is a view in rear elevation of a portion of the road roller, a portion of said view being shown in vertical section taken on line 1'l of Fig. 1.

Referring'to the drawings a road roller'is shown comprising a fram member ll]. While this member could be varied in form, in the embodiment of the invention illustrated it is shown as having a horizontal portion l'0a shown as of hollow box-like form substantially rectangular in vertical cross section and as having downwardly extending end portions Hlb also substantially rec-- tangular in horizontal cross section and of hollow box-like form. Members lOb have bifurcated lower ends through which extend transversely pins H which also extend through the horizontal hub portion 12a of axle supporting members [2 having hub portions lEb in which the axle I3 is carried. Member in also has a central depending portion |0c similar to portions lflb, the same also having pivoted thereto by one of the pins ll, another axle-carrying member l2. Member I0 has forwardly extending portions [0d extending from adjacent its ends at its front side to and being Welded to a hub Hie. Another portion llldd shown as in the form of a channel extends forwardly and downwardly from member II] to and beyond hub We, the same being secured to hub Inc as by welding. A lower bar or plate IOaa extends forwardly below member Ifldd to and beyond hub IIle, the same being connected to member Iildd. Hub Ille has bushings I4 therein adjacent its ends. A pin I6 is provided, extending through hub Ifie and bushings I4 and through a bar H which rests upon the top of hub Ille. Pin I6 is secured to bar I! in any suitable manner as by welding. Bar I! is rigidly bolted at its front end by the headed and nutted bolt I8 to a draw bar I9. Draw bar I9 is illustrated as in the form of a tube and has a clevis 28 secured thereto by a headed and nutted bolt 2| passing laterally through said draw bar. Clevis is movable about bolt 2|, and has spaced sides extending along draw bar I9 and having curved or segmental ends 20a provided with a plurality of openings 2% through any alined pair of which a bolt 22 is adapted to pass, said bolt passing through draw bar I9. As shown in Fig. 1 clevis 20 is substantially U-shaped in plan. The forward or bight portion of clevis 20 passes through another clevis or Uhaped clip 24 having vertically spaced arms connected by a pair of bolts or pins 25 to a horizontal member 26 shown as of angular form. Pins 25 are held in place by a pin 2'! extendin respectively therethrough. Member 26 will form part of a tractor or pulling vehicle or may comprise part of a hitch attached to such a tractor. Draw bar I9 has a hub lea secured therein through which pin I6 passes and a pin 29 passes through hub I900 and pin I6. The forward end of portion Iildd is provided with a hole I81 aligned with a hole I90 in draw bar I9.

A shaft 30 is disposed in the rear end of draw bar I9 and secured therein by a headed and nutted bolt 3|. Bolt 3! passes through an L- shaped or bayonet slot I92) formed in opposite sides of draw bar I9. Shaft 38 is provided with a collar 39a and has a reduced portion on which a cam roller 32 is journaled, said roller engaging collar 38a at one side and being engaged by a washer 33 at its other side, held in place by a nut 34 threaded in shaft 353.

Member I8 is bored just above central portion I Do to receive the lower end of a pin 36 which extends upwardly through a member 31 of semispherical shape, said member 31 having top and bottom flat portions and a transverse openings 31a. extending horizontally therethrough at right angles to each other. A pin 35 extends through pin 36 into member I8. A flanged collar 38 surrounds pin 35 just below member 31 and rests upon a bearing washer 38 engaging the top of member I8. Bearing casing 4| has a semispherical top portion and an internal semispherical bearing surface 4Ia which engages the top semi-spherical portion of member 31. Another bearing member or plate 42 has a semispherical surface engaging the bottom semispherical portion of member 3?. Member 42 is secured to member M by a plurality of circumferentially spaced headed and nutted bolts 43. Member 4I which is in the form of a shell closed at its top and sides, has an outwardly extending flange 4Ib which is secured to the bottom of a horizontally and transversely extending frame member 44. Member AI is open at its bottom as clearly shown in Fig. 7. Frame member 44 has a rearwardly extending portion 44a in which is formed a box or receptacle 44b. The box or receptacle 4% is adapted to receive material to weight the roller, which material may be water,

tends rearwardly and a rear axle and series of wheels carried thereon (not shown) are connected to the same.

A series of wheels 48 are carried on the axle I3, said Wheels being spaced as shown in Figs. 1, 6 and 7. Cam members 49 are secured to the central wheels and while these cam members might be variously connected to said wheels, in the embodiment of the invention illustrated they are shown as connected to the hubs 48a by headed rivets 59. Said cams have cam surfaces extending at an acute angle to the forwardly and rearwardly extending center line of the machine as shown in Fig. 6. Cam roller 32 is disposed between cams 49 at the front portions thereof.

' In operation the road roller will be drawn along on the road being compacted or surfaced, by movement of the tractor connected to member 25. As the road roller is progressed wheels 48 revolve, thus rotating cams 49. Cams 49 act upon cam roller 32, thus moving said roller from side to side as it is engaged by the opposed cam surfaces of cam 49. Roller 32 being thus moved, swing draw bar I9 to which it is rigidly connected, said draw bar swinging about its front connection to member 24. As the draw bar thus swings or moves from side to side it moves the forwardly extending port on Ifld of frame member ID from side to side. This lateral or swinging movement of member II] is accommodated by pin I'o. As member I8 is thus moved from side to side or oscillated, it in turn oscillates axle I3 and wheels 48. Wheels 48 are thus alternately moved to have their central planes extending at a slight angle to the forwardly and rearwardly extending center line of the machine as shown in Fig. 6. This gives a wobble motion to the wheels so that they make a wavy track on the road as they move along on the road. The front and rear wheels are arranged so that the rear wheels are aligned with the spaces between the front wheels. The tracks made by the wheels will thus overlap somewhat due to the oscillation of wheels 48.

If it is desired to operate the roller without the wobble wheel motion, bolt 3| can be loosened and moved into the forward portion of the slot I917 as shown in Fig. 3. This moves member 30 and cam roller 32 forwardly and positions cam roller 32 out of engagement with cams 49. Bolt 3| can be tightened to hold cam roller 32 in such position. At this time a headed and nutted bolt will be placed through the hole I81 and through the hole I90. This holds the forwardly extending portion Illd of member I9, and thus the member I0, rigid with draw bar I9 so that it cannot oscillate about pin I6. With the structure so arranged there will be no swinging movement of member In and no oscillation of the wheels.

From the above description it will be seen that I have provided a very novel, simple and efficient structure for giving the desired oscillation or wobble movement to the wheels of the road roller. The oscillation of the wheels is produced in the forward motion of the roller as it moves over the road, and by oscillating the wheel carrying portion of the device. The structure can easily be changed to eliminate the oscillation of the wheels if this is desired. It will be obvious that the device will have a high degree of utility for the purpose intended.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicant's inventionlwhich generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combination of parts disv of road-rolling wheels, a member in which said wheels are mounted side by side, a draw bar adapted to be swingingly connected at its front end to a tractor, a connection between said memher and draw bar, means operated by forward movement of said roller for swinging said draw bar about said front end to oscillate said member and wheels.

2. A road roller having in combination, an axle, a plurality of road-rolling wheels carried on said axle, a frame member in which said axle is mounted having a forwardly extending portion, a draw bar to which said portion is pivoted for movement about a vertical axis, a second member adjacent the inner end of said draw bar and means rotated about the axis of said axle engaging said second member to move said draw bar and said portion laterally and oscillate said wheels.

3. A road roller having in combination, an axle, a plurality of road-rolling wheels carried on said axle, a member in which said axle is mounted having a forwardly extending portion, a draw bar to which said portion is connected, a cam roller journaled adjacent the rear end of said draw bar, a cam rotatable about the axis of said axle engaging said roller and acting to move said draw bar and portion laterally and thus oscillate said wheels.

4. The structure set forth in claim 3, said roller being movable to position out of engagement with said cam and means for holding said roller in such position.

5. A road roller having in combination, an axle, a plurality of road-rolling wheels carried on said axle, a member in which said axle is mounted, a draw bar connected to said member and arranged for lateral swinging movement, a pair of cams rotatable about the axis of said axle and a member on the end of said draw bar engaged by said cams for moving said draw bar from side to side and thus moving said member and oscillating said wheels.

6. A road roller having in combination, an axle, a plurality of road-rolling wheels journaled on said axle, a member in which said axle is mounted, a draw bar connected to said member, cams on adjacent wheels, a cam roller carried on the rear end of said draw bar and disposed between said cams, said cams acting to move said cam roller and draw bar laterally as said road roller is progressed and thus oscillate said wheels.

'7. A road roller having in combination, a frame member, an axle carried in said member, a series of road-rolling wheels carried on said axle, a draw bar adapted to be swingingly connected at its front end to a tractor means, a pivoted connection between said frame member and draw bar, a member on said draw bar and means 1'0- tatable about the axis of said axle adapted to engage said last mentioned member for swinging said draw bar and frame member to oscillate said wheels.

8. The structure set forth in claim 7, said last mentioned means comprising cams on certain of said wheels, and a cam roller on said draw bar and disposed between said cams.

9. A road roller having in combination, a frame member, an axle carried in said frame member, a series of road rolling wheels mounted on said axle, said frame being constructed and arranged for lateral swinging movement, and means operated by rotation of certain of said wheels as said roller progresses for swinging said frame member from side to side about a substantially vertical axis for oscillating said wheels.

10. A road roller having in combination, a. frame member, an axle carried in said frame member, a series of road-rolling wheels mounted on said axle, said frame member being constructed and arranged for lateral swinging movement, and means for repeatedly and continuously swinging said frame member as said roller is progressed for oscillating said wheels without changing the direction in which said roller is progressed so as to cause said wheels to make sinuous tracks, said last mentioned means comprising members rotatable about the axis of said axle.

11. A road roller adapted to be moved forwardly in a definite direction having in combination, a series of road-rolling wheels, an oscillatable frame in which said wheels are mounted side by side, a member constructed and arranged for swinging movement at one end, a connection between said frame and member, and means operated by forward movement of said roller for swinging said member about said front end for oscillating said frame and said wheels for causing said wheels to make a sinuous path.

12. A road roller constructed and arranged to be moved forwardly in a substantially rectilinear direction having in combination, a frame, an axle mounted in said frame, a series of wheels carried on said axle with their planes substantially perpendicular to the axis of said axle, a member connected to said frame and constructed and arranged to be swung laterally about an axis adjacent one end and means operated by forward movement of said roller for swinging said member about said axis to swing said frame from side to side to oscillate said wheels and cause the same to make sinuous paths.

JOHN R. RITCHIE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,842,717 Doyle Jan. 26, 1932 7 2,226,182 Ross Dec. 24, 1940

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