B - Operations – Transporting – 62 – M
Patent
B - Operations, Transporting
62
M
B62M 3/16 (2006.01) B62K 3/00 (2006.01) B62M 1/02 (2006.01) B62M 1/04 (2006.01)
Patent
CA 2414681
A quasi-rectilinear drive mechanism for a bicycle comprised of left and right 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 alternate 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 the bicycle's steering head at an approximately 45-degree angle above the crankshaft's axis 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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