RACING BICYCLE Russian patent published in 1996 - IPC

FIELD: racing and cycling in mountains. SUBSTANCE: bicycle has system with inner and outer gear pairs with drive from driving member. System is installed on bicycle axles. Bicycle has spring-loaded carriers 8 and 11 fitted in axles and helical gear couplings 13 and 15 installed for limited axial displacement and engagement with spring-loaded carriers. Each driving member is helical-gear one made for engagement with corresponding gear coupling to provide advance engagement with driven member. Speed changing takes place quickly, without shocks when road conditions change. Device makes it possible to adjust speed change effort to requirements of rider individually. EFFECT: provision of multistage automatic speed changing. 3 dwg