| 摘要 |
A superefficient bicycle frame having a plurality of dual tapered rectangular or square cross section frame members having constant wall thickness. The torsional/bending section modulus of a member is changed by providing a dual taper to the cross section of the frame members so that larger cross sections are used at points of greatest stress and smaller cross sections are used at points of lower stress. The method of manufacture is to cut various two dimensional shapes from sheet stock which are bent along nonparallel bend lines to form the various members. This method of manufacture permits the ends of the section members to be shaped as desired by laser or plasma cutting, or other means, in the flat before bending. The tapered frame members are then connected to form a superefficient frame.
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