BICYCLE AND LEVER-AND-RATCHET GEAR Russian patent published in 2000 - IPC

FIELD: transport engineering. SUBSTANCE: bicycle is furnished additionally with disk cam drive mounted on driving axle and lever-and-ratchet gear coupled with flexible tie of derailleur gear. Cam disk and lever-and-ratchet gear follower kinematic pair is constantly open. Speed change control member is made in form of two rigidly coupled buttons arranged opposite to each other in housing divided by diaphragm into two spaces, one of which is coupled, through pneumatic drive, with similar diaphragm for closing kinematic chain between cam disk and follower at changing the speeds. Lever-and-ratchet mechanism has follower installed for turning on axle and coming into engagement with cam disk and with carrier-lock. Driven diaphragm of pneumatic selector is rigidly coupled with follower. EFFECT: improved reliability and convenience of speed change control. 4 cl, 5 dwg