| 摘要 |
<p>A collapsible bicycle comprises a triangular frame formed from three struts (A, B and C). The bottom strut (C) can be disconnected from the forward strut (B) by operating a releasable pivot joint (J) so that the strut (C) can be folded up against the rear strut (A). A universal joint between struts (A and B) then allows these two struts to be folded to lie alongside one another with the pair of wheels (W1 and W2) lying side by side. Cranked portions (7 and 8) of the struts (A and B) provide offset supports for the wheels to one side only so that they can readily be positioned side by side and ideally locked together. The folded framework can then be transported, if required, by grasping a support (6) or handlebars (H) and running the unit along the ground on the pair of wheels (W1 and W2). A saddle (S) is adjustably mounted on the rear strut (A) by a sliding support (39) having fixing clamps (40). The bicycle is preferably driven from pedals (P) by means of a drive belt (D) rather than a chain and the front pulley (3) can incorporate a freewheel unit (5) and/or gearing.</p> |
