Simple, compact and effective self-extending and retracting bicycle crank arm
US7093516B2 · kind B2 · utility
1Cited by
27References
9Claims
0Family size
Inventor
Key dates
| Filing date | Jul 14, 2003 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Oct 23, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2167
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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 in design, compact in size 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 directions in the power down stroke and (b) the minimum arm length for close to 90 degrees of arm directions in the return up stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.