Rear derailer for bicycle gears
US4801287A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1988 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jun 16, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62M9/124
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A rear derailleur for bicycle gears comprises an upper body which can be fixed to the bicycle frame and a lower body carrying chain transmission member and being movable relative to the upper body to bring the chain into selective engagement with a series of sprockets carried by the hub of the rear wheel of the bicycle. The lower body is connected by an articulated parallelogram joint to an intermediate connecting element which is in turn mounted for sliding on guide member carried by the upper body. Connecting rods are provided for univocally correlating the movements of the intermediate element relative to the upper body with the movements of the lower body relative to the intermediate element. In this way, the resulting movement of the lower body relative to the upper body has both a component along the axis of the hub of the rear wheel of the bicycle, and a component radial to that axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.