BLOCKING DEVICE FOR A MOTOR VEHICLE STEERING SHAFT

摘要

A device for locking the steering shaft of a motor vehicle against rotation, includes a locking bolt cooperating with locking recesses of the steering shaft, which bolt is movable back and forth between a locking position and a release position by a control member that cooperates with a rotary position detector and is rotatable in two directions by an electric motor. The control member has a spiral rib or a spiral groove, which winds around the axis of rotation of the control member and cooperates with the rotary position detector in order to sense the rotary position of the control member corresponding to the release position of the locking bolt and the rotary position of the control member corresponding to the locking position of the locking bolt. A further detector is provided with which the locking bolt cooperates in order to sense the release position of the locking bolt.