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US 2004/0103747 A1Published application
A simple, compact and effective self-extending and retracting bicycle crank arm
AssigneeEric Kam-Ling Hung
InventorEric Kam-Ling Hung
Life of this patent
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Abstract
This invention is a bicycle crank and pedal assembly with a self-extending and retracting crank arm. The assembly only has three one-piece components that move relative to each other, if the bearings used in friction reduction are ignored. It is simple, compact and very effective in delivering the benefits of a self-extending and retracting crank arm. In particular, the assembly has (a) the maximum arm length for over 90 degrees of arm positions in the power down stroke and (b) the minimum arm length for close to 90 degrees of arm positions in the return up stroke.
Claims3
A bicycle crank and pedal assembly comprising:
- a crank arm that has a cavity for a rotating plate as well as a track for a device to move back and forth along the length of the crank arm;
- a device that moves on a track in the crank arm and has a pedal spindle fixed to it at one end;
- and
- a subassembly in which a plate and a pedal are fixed to the opposite ends of a plate shaft.
1 more element
Dependencies are inferred from the claim text.