Identifier: studyofsidedraft349hoff (find matches)
Title: A study of sidedraft and tractor hitches
Year: 1922 (1920s)
Authors: Hoffman, A. H. (Arthur Henry), 1873-1931
Subjects: Tractors
Publisher: Berkeley, Cal. : Agricultural Experiment Station
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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tch isused. It will be noted also that thepoints A and B are at equal dis-tances from the points at which thesheaves are fastened on the twoattachment bars. Only in the casewhere the line AB is parallel to thedirection of motion of the tractorwill there be no sidedraft. If theattachment bar is not symmetri-cally placed on the tractor, orrather if the sheaves are not sym- Fkf. 47 A patented chain hitch. The chainpasses around four sheaves, two of which(those on the tractor) may be pinned toprevent their turning. This hitch doesnot prevent sidedraft. metrically placed with re-spect to the center line ofthe tractor, so that the lineAB does not pass throughthe midpoint of the rearaxle of the tractor, there Fig. 48 Diagram of the hitch of fig-ure 47. The line AB shows thetrue direction of the pull. Thereis sidedraft if the line AB is notparallel to the direction ofmotion, and unequal loading ofthe drivers unless the line BAproduced passes through themidpoint of the rear axle ofthe tractor,
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150 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION will be unequal loading of the drivers. Evidently it is possible withthis hitch to divide the sidedraft between tractor and plow, as withother hitches previously explained. Hitches to adapt horse gang plows for tractor operation.—Whenthe tractor makes its first appearance on a ranch, there are usually onhand a good many implements in fair condition designed for horseoperation. Often at a small expense of time, labor, and materials thesemay be adapted for tractor operation and do fairly satisfactory work.It would be foolish, however, to assume that these adapted implementscould generally be made to work as well as implements especiallydesigned for tractor operation. Since plowing requires more power than any other farming opera-tion, it is usually the particularjob for which the first tractor ispurchased. Several gang plowsdesigned for horses may behooked up together and drawnby rods or chains from one heavycrossbar, as in figures 49 or

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