. Automotive industries . he leading point, A, may be takenas representing the front truck or trailer wheels in rela-tion to B as the rear wheels, but the initial relation ofA to C, and particularly to D, is such as will occur mostlywith semi-trailer outfits, in which case A can be takenas the fifth-wheel joint. The application to two-wheeltrailers, dollies and trailers with fifth-wheel or axlesteering is equally obvious, and it is noticed that curveD represents a backing movement followed by a go-ahead. To see whether the method is fully applicable to back-ing movements of four-wheel trailer
. Automotive industries . he leading point, A, may be takenas representing the front truck or trailer wheels in rela-tion to B as the rear wheels, but the initial relation ofA to C, and particularly to D, is such as will occur mostlywith semi-trailer outfits, in which case A can be takenas the fifth-wheel joint. The application to two-wheeltrailers, dollies and trailers with fifth-wheel or axlesteering is equally obvious, and it is noticed that curveD represents a backing movement followed by a go-ahead. To see whether the method is fully applicable to back-ing movements of four-wheel trailer outfits, one musttake cognizance of the practice so far followed, consist-ing in locking the front wheels when the outfit is to bebacked up while unlocking the rear wheels and steeringthem by hand. The steering by hand should only consistin preventing the wheels from whirling around to theirmost extreme position and thereby blocking further rear- 1010 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE May 12, 1921 12/4 TRAILINGCURVE D3. TRAILINGCURVE C Fig. 14—Diagram showing how the tracks of trail-ing wheels can be easily plotted, when the curvedescribed by leading wheels or by a relatively fixedpoint, such as a coupling hook, is known or as-sumed. By this method and symbolic figures forthe vehicles (the figures drawn to scale) all move-ments in turns and maneuvers of semi-trailer andtrailer outfits, as well as of trucks, can be put onpaper and be made to serve the needs of drivers,designers, owners of transportation outfits andothers interested. For explanation see text ward movement of the outfit. On this assumption, thecurve of the rear trailer wheels can be laid out in adiagram as a trailer curve determined by the curve de-scribed by the fixed front wheels. In practice some de-viation from this course can be effected by forcing theunlocked rear wheels to a path not quite consistent withthe path of the hook which pushes the locked frontwheels, but some skewing, skidding and strains ar
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
