Crank assembly for a full-suspension bicycle
US6474669B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Apr 3, 2001 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Apr 3, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62K25/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A crank assembly for a bicycle uses a chain and a plurality of auxiliary sprockets to achieve high ratios of wheel speed to pedal-rotation speed. The crank assembly is designed for use on a full-suspension bicycle, as the relative motion of the drive sprockets (22) of the transmission is isolated from the motion of the rear suspension arms (18, 20), which form the chain stays of the bicycle, and whose pivot is co-axial with the axle of the pedal cranks (14). Motion of the suspension arms about the pivot induces rotation by an equal angular measure of the drive sprocket of the transmission. So no relative motion of the drive sprocket and suspension arms occurs except that which is induced by the pedal cranks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.