US2514711A - Tandem road roller - Google Patents

Description

y 1, 1950 H. w. LEWIS 2,514,711

TANDEM ROAD ROLLER Filed Aug. 12, 1946 2 Sheets-Sheet 1 ghwzntoz H. W. Lewis artoznm a,

July 11, 1950 H. w. LEWIS 2,514,711

TANDEM ROAD ROLLER Filed Aug. 12, 1946 2 Sheets-Sheet 2 I Fig.2.

gnucmfoz H. Lewuls Patented July 11, 1950 UNITED STATES PATENT OFFICE This invention relates to tandem road rollers, one of the objects being to provide a roller which permits road rolling operations to be carried close to obstructions, such as curbs, building forms,

etc., for a greater height than heretofore has been possible.

vAs far as the applicant. is aware all tandem rollers thus far developedmake allowance for a certain distance of ,roadsurface adjacent to suchobstructions which must be left unrolled ,due-to' the overhanging frames and driving mechanism.

It isan object of the present invention to avoid this objectionable feature by driving and braking the roller from inside the roller edges so the rollers thus can be brought up to the curb or other side obstruction.

With the foregoing and other objects in view which appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings:

Figure 1 is a side elevation of the tandem 1 roller, parts being broken away.

Figure 2 is a vertical transverse section showing the drive mechanism for the roller, said mechanism being located at one side of the roller.

Figure 3 is an elevation of a portion of the machine showing the bearing at the opposite side of said roller.

Referring to the figures by characters of reference, l designates the body of the twin roller which can be of any suitable design and proportions, it merely being essential that all portions of this body be located well above the level of the axes of rotation of the front and back rollers. The term body as here used means every part of the road rolling machine except the motor, rollers, and power transmission extending from the motor to the driven roller. This body carries a suitable motor indicated generally at 2 adapted to transmit motion by any suitable means, such as a pulley or sprocket 3 through a belt or chain 4 to a pulley or sprocket 5 forming part of a suitable transmission 6 which has not been illustrated in detail but which can be of any type such as commonly employed for the purpose of obtaining the desired speed and directional cha s i e. mo e nt c hemec ani m 1A powe ake Qf s ai i e e d dlat ra l rom andiorms a par of the tr nsm si n d ro .aectsin o a-nar cw ho 8 loca ed on one. e

c ethe ody I. .A p t 9 or the like sqar d b th p on time s a t w i t was 8 and serves o ra smitm on h ou h chain lfl orthe like to anothersprocket 11 also "located in the housin 8. h s s c et H or helike lislocated at the outer end of a shaft I2, the inner endof which is supported :withinone of the open ends of a road roller l3,

Asshown particularly iuFis-ur 2 hi o r I3 h s s eads I4 se inward om t e ends o th er \so that am l ance h s i le b w en o e of the heads and the adjacent end of the roller to accommodate that portion of the driving mechanism which is located at points below the axis of rotation of the roller. Both heads of the roller are set inwardly as shown in Figure 2 and are joined by a tubular core l5. In this core is centered a shaft I6 which is extended loosely through bearings l6 joined to the heads and rotatable with the core. The ends of the shaft are secured firmly to hearing brackets H, the upper ends of which are attached to the inner sides of the superstructure consisting of the body I and the housing 8, these brackets being extended downwardly along converging lines so that the lower ends thereof to which the shaft [6 is attached are supported well within the space defined by the ends of the roller 13.

The inner end of the shaft 12 is extended into the space defined by the adjacent end of roller l3 and carries a sprocket 18 or the like adapted to transmit motion by a chain or other means I9 to a sprocket 20 which is completely surrounded by the adjacent open end of the drum or roller 13, said sprocket being attached to the adjacent head M of the roller by means of connecting bolts or lugs 2 I.

It is to be understood, of course, that the front roller 22 will also have open ends with the inset heads 23 so that the brackets 24 which connect the roller to the main structure will not project beyond the sides of the rollers at any point below the axis of rotation of the roller.

It is thought that the advantages of the present structure will be apparent from the foregoing. There is no part of the structure below the axle of the roller which projects laterally beyond the ends of the roller where it could contact with a curb, form or other obstruction at the side of the road. The motor indicated generally at 2, while extending below the body I, is set inwardly the side walls; front and rear rollers mounted on motor to one roller for driving said roller, said transmission extending upwardly from the motor to the side wall, along the side wall to the driven roller, and to the enclosed upper portion of the driven roller, said transmission including transmission elements extending from a point along the side wall to the driven roller below, said elements being disposed inwardly of one end of said roller, said axles being carried by the side walls therebelow, all portions of said body, motor, andtransmission that are lower than the axle of the driven roller being confined to a space defined between the ends of said roller, so that below its the axles; a motor mounted on the body; and

means mounted on one side wall and extending from the motor to one roller for driving said roller, saidmeans including transmission ele-, ments extending from a point along the sidev wall to the driven roller below, said elements being disposed inwardly of one end of said roller, said axles being carried by the side walls therebelow, all portions of said body, motor, and drive means that are lower than the axle of the driven roller being confined to a space defined between the ends of said roller, so that below its axle, the ends of said roller are the outermost parts of the machine at opposite sides of the machine.

2. In a road rolling machine a body including depending side walls; spaced axles carried by the side walls; front and rear rollers mounted on the axles and having their upper portions enclosed by the side walls; a motor mounted on the body and confined within an area bounded at its ends by the rollers and at its sides by the side walls; and a power transmission extending from the axle, the ends of said roller are the outermost parts of the machine at opposite sides of the machine.

HARDY W. LEWIS.

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

UNITED STATES PATENTS Number Name Date 939,877 Todd et al Nov. 9, 1909 1,345,109 Seeley June 29, 1920 2,154,720 Biles Apr. 18, 1939 2,334,086 Greiner Nov. 9, 1943 FOREIGN PATENTS Number Country Date 230,769 Great Britain Mar. 19, 1925 318,955 Great Britain Sept. 13,1929 553,419 Germany June 28, 1932

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