| 摘要 |
A twisted bicycle stem includes first and second substantially identical helically twisted clamping members fastened together using four threaded fasteners received in four corresponding threaded apertures. The assembled twisted stem defines a vertical cylindrical receiving aperture and an opposing substantially horizontal cylindrical receiving aperture having a central axis offset by 90° with respect to the central axis of vertical receiving aperture. The two helically twisted clamping members each comprise one-half of the finished stem structure for receiving the substantially horizontal handlebar and the substantially vertical steerer tube. First and second helically twisted clamping members are preferably manufactured of an engineering plastic, preferably reinforced with a 50% glass fiber fill or carbon fiber fill using high tensile strength filaments. Each of the helically twisted clamping members preferably includes a twisted longitudinal external scoop or groove and functions as a twisted I-beam, thereby saving material and weight and providing a shape which permits the helically twisted clamping members to be molded in plastic and removed from the mold. A plurality of identical helically twisted clamping members are preferably fabricated in a single mold and two members are used to fabricate a twisted bicycle stem. The transverse extent of the scoop is bounded by first and second opposing ribs, also helically twisted in a 90° turn or quarter twist. In an alternative embodiment, the helically twisted clamping members are machined from titanium, aluminum, steel or the like.
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