US1186077A - Tractor-wheel. - Google Patents

Description

G. H. CHRiSTMAN.

TRACTOR WHEEL.

ARPLICATION FILED JAN.29,1916.

1 1 86,077, Patented .J une 6, 1916;

3SHEETSSHEET I.

G. H. CHRISTMAN.

TRACTOR WHEEL.

APPLICATION FLLED JAN.29, 1916.

1 1 86,077. Patented June 6, 1916.

Tnr: coLuMnlA PLANDGRAPH co., WASHINGTON. D. c

GEORGE H. CHRISTMAN, OF SEAT PLEASANT, MARYLAND.

TRACTOR-WHEEL.

Specification of Letters Patent.

Patented June 6, 1916.

Application filed January 29, 1916. Serial No. 75,100.

To all whom it may concern Be it known that I, GEORGE H. CHRIST- MAN, a citizen of the United States, residing at Seat Pleasant, in the county of Prince George and State of Maryland, have invented certain new and useful Improvements in Tractor-Theels, of which the following is a specification.

My invention relates to tractor wheels. I

The objectof my invention is to produce a tractor wheel having radially extending tractor blocks adapted to be alternately projected beyond the perimeter of the wheel and retracted within the perimeter thereof.

Another object of my invention is to produce a wheel of said character provided with projectable tractor blocks with means for alternately projecting and retracting said blocks and means for throwing said projecting and retracting means out of operation whereby the wheel may be revolved without the operation of the tractor blocks.

A further object thereof is to produce a wheel of the character described having means carried within its hub adapted to al ternately project and retract the tractor blocks carried thereon and means for adjusting said operating means 'intoand out of operating positions: and a still further object of my invention is to produce a more simple, cheap and efiicient device of p the character described than has heretofore been attained.

To these ends my invention includes, thecombination and arrangement of component parts to be hereinafter described and'more particularly pointed out in the claims. 7

In the accompanying drawings, in which like reference characters indicate similar parts; Figure l is a side view of the tractor wheel of my invention; Fig. 2 is a vertical, transverse sectional view of the same. Fig. 3 is a vertical, sectional view of the tractor operating adjustable cam carried on the wheel shown in inoperative position; Fig. 4 is a similar view, showing same in operative position; Fig. 5 is a transverse, sectional view of F igg t. Fig. 6 is a detail view of the lever mechanism for adjusting the cam which operates the tractor blocks; and Fig. 7 is a sectional view of a modified form of construction of my wheel axle, showing the parts thereof as separable.

Referring now to the drawings, 1 indicates a tractor wheel comprising the rim 2 having the radial spokes 3 extending from the hub 4., which as shown adjacent to their outer ends, are preferably bifurcated at 5. Said parts arepreferably cast integrally and each of the spokes is provided with a radial, longitudinal channel 6 extending from the hub to the outer rim, which channel at its outer end is enlarged to accommodate thetractor block 7 carried on the end of the rod 8. Within said hub and mounted on suitable brackets 9 are provideda plurality ofroller bearings 10'upon which the wheel revolves, but as these form no part of my invention they will not be more particularly described. The wheel and hub thus described are mounted on the axle 11, which offset from its outer end, is provided with an enlarged annular portion 12, upon which is provided the means for alternately pro jecting and retracting the tractor. rods 8 when it is desired to adjust same for operation;

Upon the inner ends of the tractor rods 8 are carried rollers 13 mounted on the transverse spindle 14 adapted to be carried in the way 15 surrounding the enlarged portion 12 of the axle 11. Said way is formed by the metallic bands 16 and 16, the ends of which are recessed in the slot 17 formed in the enlarged portion 12 ofthe axle, while the intermediate portion thereof rests in the groove 18 on the perimeter thereof. The outer wall of said way is formed of the segmental bands 19, 20 and 21 which are preferably L-shaped in cross section and are hinged together at their contacting ends by the leaf hinges 22. Said L-shaped outer bands are spaced from the inner bands 16 and 16 by a plurality of arc-shaped blocks secured on the outer band and are adapted to be adjusted concentrically with the inner bands, as will be hereinafter described, through the medium of the hingesmentioned and a sliding engagement of one end thereof w1th the groove 23,

as more particularly shown in Figs. 3 and 4-- v The lower portion of the enlarged section I 12 of the axle is provided with a cut out portion or recess 24, in which is seated a lever 25 rigidly. carried on the. transverse rod 26 which extends through the walls of said recess 24. The outer ends of the bands 16 and 16 are attached to the outer orfree end of said lever 25, by which, when the rod 26 is rocked to move the lever 25 outwardly,

said bands are extended to an eccentric position together with the L- shaped bands 19, 20 and 21 whereby the way 15 is extended into eccentric position with respect to the axle and a cam is thus formed for actuating the rods 6 inwardly and outwardly as the wheel revolves, and whereby the tractor blocks 7 are extended beyond the perimeter of tile wheel at its point of contact with the roa As before stated,.the lever is moved inwardly and outwardly by the rod 26 and said rod is actuated by the bell crank lever 27 connected with a root lever on the vehicle to which the wheel is attached and said levers are normally held in inoperative position by the spring 28 attached to the wheel shaft or axle 11.

In the modified form of my invention, shown in Fig. 7 of the drawings, my wheel axle on which the parts hereinbefore described are carried, isformed of separable parts comprising the main shaft 30 having the longitudinal reduced extension 31 provided with a screw-threaded end 32 on which is carried the enlarged portion 33 rigidly secured thereon by the outer portion of the axle 34 screwed upon the end of the reduced part 31.

Having thus described my invention, what I claim as new and desire to be secured by Letters Patent, is:

1. The combination with an axle, of a wheel mounted thereon, radially extending tractor rods carried on the wheel having tractor blocks on the outer end thereof and adapted to be reciprocated in their bearings, a collapsible member carried on the axle capable of being expanded into eccentric form and contracted into concentric form engaging the inner ends of said tractor rods, as and for the purposes specified.

2. The combination with an axle of a wheel mounted thereon, radially extending tractor rods movably carried on said wheel having tractor blocks on their outer ends adapted to be projected beyond the perimeter of the wheel, a plurality of flexible bands carried on the axle within the hub of the wheel forming a way around the axle, means carried on inner ends of said tractor rods within said way to control the projection and retraction of the rods, and means for retaining said way in concentric annular position and for distorting same into eccentric cam-like form to impart a reciprocating 1 movement to the tractor rods and project the tractor blocks beyond the perimeter of the wheel rim at predetermined positions in the revolution of the wheel.

3. The combination with an axle, of a wheel mounted thereon having hollow radial spokes, tractor rods movably carried in said spokes having tractor blocks on their outer ends, a plurality of flexible bands carried 011 the axle within the hub of the wheel, one end of each of which is slidably carried in a slot in the axle, a sectional expansible ring secured to the axle concentric with said bands forming with said bands a normally annular way around the axle, rollers mounted on the inner ends of said tractor rods and confined between said bands and ring, a lever mounted on the axle to which the opposite ends of said bands are attached for expanding the bands and ring into eccentric cam-like form to reciprocate the tractor rods and project the tractor blocks at predetermined positions in the revolution of the wheel, and means for actuating said 1ever to throw said bands and ring into concentric and eccentric positions, substantially as described.

4. The combination with an axle having a recess therein, of a wheel mounted thereon having hollow radial spokes, tractor rods movably carried in said spokes having tractor blocks on their outer ends, a plurality of flexible bands carried on the axle within the hub of the wheel, one end of each of which is slidably. carried in a slot in the axle, a lever mounted on the axle in said recess to one end of which the outer ends of said bands are attached, a sectional, expansible ring secured to the axle concentric with said bands and forming therewith a nor mally annular way surrounding the axle, rollers mounted on the inner ends of said tractor rods and confined in said way, a lever for actuating said first-mentioned lever to expand said bands and ring into eccentric cam-like form to reciprocate the tractor rods and project the tractor blocks at predetermined positions in the revolution of the wheel, substantially as described.

5. The combination with an axle, of an enlarged portion thereon intermediate of its ends, of a wheel mounted thereon having a hub surrounding said enlarged portion of the axle, said enlarged portion being pro vided with a recess therein, radially extending tractor rods movably carried in the wheel having tractorblocks on their outer ends, a plurality of flexible bands carried on the enlarged portion of the axle, one end of each of which is slidably seated in a slot therein, a lever mounted in the recess in the axle to which the outer ends of said bands are attached, a sectional, expansible ring surrounding said bands and enlarged P01; tion of the axle having an annular slot therein, rollers mounted on the inner ends of said tractor rods and confined between said band and ring, and a lever for distorting said bands and ring into eccentric cam-like form to reciprocate the tractor rodsand project the tractor blocks, substantially as and for the purpose described.

6. An axle for a tractor wheel, comprising a main body portion having a reduced longitudinal extension on the end thereof, and outer portion in removable positions an enlarged portion removably carried on on the main portion, substantially as desaid longitudinal extension and an outer scribed. 10 axle portion removably carried on the outer In testimony whereof I hereby aflix my end of said reduced extension of the same signature.

diameter as the main body portion, and

means for securing said enlarged portion GEORGE H. OHRISTMAN.

copies of thin patent may be obtained for five cents each, by addressing the "Commissioner of Patents, wuhington, D. G.

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