| 摘要 |
A method and apparatus for the control of respective speed change gear units at the rear wheel and crank-wheel of a bicycle comprising two pivotable levers mounted on the bicycle each including an integral bearing with a groove therein. A cable is associated with each of the speed change gear units and is operatively coupled in the groove of a bearing of a respective pivotal lever. The cables are wound on the respective bearing of the levers in opposite directions as viewed from the same side of the bicycle such that when the levers are pivotably moved in one direction, one cable is pulled in tension and the other cable is released. The gear units each have a plurality of gears arranged in stepped order and include a shift member which is resiliently biased in opposition to the pull of the associated cable such that when the levers are pivotably moved in one direction, shifting of the gears is effected from the smaller to the larger gears in each unit whereas when the levers are pivotably moved in the opposite direction, shifting of the gears is effected from the larger to the smaller gears of each unit. |
