A bicycle crank assembly is provided having a sprocket flange and a pedal crank arm, the sprocket flange being coaxially affixed to a bicycle crank shaft, the first end of the pedal crank arm being coaxially mounted about a laterally projecting generally cylindrical shaft member of the sprocket flange, a pedal bolt being affixed proximate a distal end of the pedal crank arm, and the pedal crank arm being affixed proximate the perimeter of the sprocket flange generally opposite the pedal bolt with a 145 degree offset about the axis of rotation of the bicycle crank shaft to increase the distance from the drive bolt to the pedal and to increase the leverage and power imparted to the bicycle crank assembly. A sprocket is coaxially affixed to the sprocket flange. A second pedal-powered crank assembly is coaxially affixed to the opposite end of the bicycle crank shaft, with a 180 degree offset about the axis of rotation of the bicycle crank shaft from the first pedal-powered crank assembly to provide continuous, uninterrupted torque to the bicycle crank shaft through a 360-degree rotation of the pedal-powered crank assembly.
Crank assembly particularly suited for bicycles
2022-02-17
Patent
Elektronische Ressource
Englisch
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
CHAIN TRANSMISSION, PARTICULARLY FOR BICYCLES, WITH CONTINUOUSLY VARIABLE TRANSMISSION RATIO
Europäisches Patentamt | 2017
|CHAIN TRANSMISSION, PARTICULARLY FOR BICYCLES, WITH CONTINUOUSLY VARIABLE TRANSMISSION RATIO
Europäisches Patentamt | 2018
|