Gear transmission control device for multiple-speed hub for bicycles

摘要

A gear transmission control device for a multiple-speed hub for a bicycle, in which an actuating arm is mounted to one end of a controller for the gear transmission of the hub, which arm is pivoted to a fixed member of the hub through a pivot and a control arm is pivoted to the pivot in the relation of being shiftable with respect to the actuating arm. An energy-storage spring is provided between both the arms, so that the control arm is shifted with respect to the actuating arm to energize the spring when the controller is subjected to a resistance in excess of a prescribed value. When the resistance is released the stored energy in the spring allows the actuating arm to swing, thereby changing the bicycle speed to a desirable speed-change stage.