BICYCLE WITH AUTOMATIC SPEED CHANGE Russian patent published in 2010 - IPC B62M9/123 B62M25/02 F16H13/08 F16D43/06 

FIELD: transport.

SUBSTANCE: invention relates to automatic speed control of bicycle with the help of centrifugal force of rolling loads with following assisting force connection from spinning wheel plug for operation of back speed switch. Control link (9) is brought into rotation with plug (8) of front wheel and connected by means of a rope to centrifugal weights (12) the action of which on link (9) is balanced with spring (20). When centrifugal force increases, link (9) joins threaded half-coupling (11) movable in threaded section of axis (7). Further displacement of threaded half-coupling (11) along axis (7) through rope (6) controls the back switch in order to switch the chain from bigger sprocket to smaller one. When centrifugal force decreases, link (9) joins reverse half-coupling (10) which through satellites in the form of balls (14) rotates threaded half-coupling (11) in opposite direction. As a result of reverse displacement along axis (7) threaded half-coupling (11) controls the back switch through rope (6) in order to switch the chain from smaller sprocket to bigger one. Fork (18) is fixed relative to axis (7) of fork of the front wheel and includes longitudinal slots (19) throughout the width of balls (14). Locking and spring-loaded rings (16), (17) form a gap-free link rail for balls (14).

EFFECT: simplifying the design and decreasing dimensions and weight.

2 dwg