A bicycle crank 1 includes a base arm 200 positioned on an outside of a chain wheel 10 and connected at one end to the chain wheel 10, wherein the base arm 200 is rotatable synchronously with the chainwheel 10; a base sprocket 300, fixed to the base arm 200 and facing in the chainwheel 10; an outer sprocket 400, rotatably connected to the other end of the base arm 200 via an outer spindle 410; a transmission component 500 rotatably connected to the base sprocket 300 and the outer sprocket 400; and an outer arm 600, having one end rotatably connected to the outer spindle 410 and rotatable synchronously with the outer sprocket 400 and the other end rotatably connected to a pedal 610. The outer arm 600 may be set at an angle elevated from the horizontal by 18 or 36 degrees.
Bicycle power-saving crank
2025-04-30
Patent
Electronic Resource
English
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
CRANK DEVICE WITH POWER SAVING MECHANISM AND BICYCLE CRANK ASSEMBLY
European Patent Office | 2024
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