METHOD FOR RESTORING COIL SPRING AND ACCUATOR HAVING INITIAL TENSION COIL SPRING

摘要

A method for restoring a coil spring which is permanently transformed and a coil actuator are provided to restore a transformed coil spring by changing the coil winding direction of the coil spring. A method for restoring a coil spring which is permanently transformed comprises following steps. A transformed coil spring is prepared. The coil winding direction of the coil spring is changed into a reverse direction. A reverse coil spring of closed state is obtained by closely attaching a plurality of coils at the same time. The reverse coil spring of the closed state is extended and the coil winding direction is reversely changed. A forward coil spring of initial closed state is obtained by closely attaching a plurality of coils at the same time.