Chain wheel and crank for a bicycle
US4150859A · kind A · utility
7Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1978 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Mar 17, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62M3/003
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A bicycle chain wheel and crank of three pieces, namely a crank shaft and a pair of crank arms. The crank shaft freely rotatably supports the chain wheel through a cone, so that the crank is easy and inexpensive to manufacture. The crank arms can be of common shape because a chain wheel mounting boss does not have to be formed on the crank arm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.