| 摘要 |
Provided are parallel crossbars mounted in a stretchable bicycle comprising unitary front and rear connecting devices made of aluminum formed by extrusion, either connecting device comprising two parallel channels each having an open inner side being in communication with the open inner side of the other channel, upper and lower plates formed between the channels, and two openings formed on the upper and lower plates respectively wherein a head tube or seat tube has its upper end fixedly connected to the openings; two sliding tubes adapted to slide through the channels respectively; and a plurality of quick releases each comprising a bolt having a threaded end inserted through the plates, a nut threadedly secured to the bolt, a lever, and a cam shaped pivot. Pivoting the lever downward about the pivot will flexibly compress the plates toward each other for fastening the sliding tubes.
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