Method for making hollow bicycle cranks
US6612033B1 · kind B1 · utility
2Cited by
13References
1Claims
0Family size
Inventor
Key dates
| Filing date | Mar 15, 2002 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Mar 15, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49996
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for making a hollow crank includes a three-direction forging step to forge a piece to have a recess in a first end of the prototype; a step of forming a hollow first end of the prototype by forcing the first end through a cone-shaped passage in a mold; a step of forming the first end of the prototype to have an angle relative to the second end of the prototype; a step of setting the first end of the prototype in a cold-forging mold to set the shape of the prototype.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.