Mechanisms for a control knob or other interface device providing additional degrees of freedom for the knob. One embodiment provides a rotatable knob moveable also in a lateral plane approximately perpendicular to the axis of rotation. A mechanism providing the lateral motion can include a gate member...http://www.google.com/patents/US7038667?utm_source=gb-gplus-sharePatent US7038667 - Mechanisms for control knobs and other interface devices
