| 摘要 |
A quasi-rectilinear drive mechanism for a bicycle comprised of left and rig ht crank arm and pedal assemblies, each of said crank arms driving a transverse crankshaft through left and right one-way clutch assemblies. The rider applies alternat e pedal strokes to the crank arms, thereby inducing unidirectional forward rotation of said crankshaft and associated power transmission components too the rear wheel. To provide support for a standing rider during coasting as well as forcing synchronized , opposed pedal strokes, each crank arm is constrained to rotate within its forward quadrant by means of a cable and pulley. Said pulley is affixed by a swivel mount near t he bicycle's steering head at an approximately 45-degree angle above the crankshaft's axi s of rotation. A cable passing over said pulley is affixed at each end to one of the two pedals, thereby causing each pedal to lift its opposite-side crank assembly as it is depressed. The cable's length and pulley's location are configured such that cable tension provides a positive pedal stop at the top and bottom of each stroke. Embodiments may be retrofitted to conventional bicycles or incorporated into miniature step scooters.
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