Mechanism for adjusting the position of a bicycle chain

摘要

A linkage system is provided on a bicycle for displacing a bicycle chain between chain wheels mounted on a common axis. The linkage system includes a first linkage head fixed to a support attached to the bicycle frame and a movably positionable second linkage head connected to a device for moving the chain. An articulated lever and a guide member are connected together by a pivot joint intermediate their ends with the ends of the lever and guide member being pivotally connected to the two linkage heads. The joints connecting the lever to the linkage heads permit the lever to effect a sliding movement not available to the guide member. A mechanism for deforming the linkage system is connected to the pivot which mounts the guide member on the first linkage head.