A scanner or other system has an actuator, a mechanical device having three states corresponding to three respective positions of the actuator, and a pedal mechanism. The pedal mechanism comprises: a support structure; first and second slotted arms pivotably mounted to the support structure; first and...http://www.google.de/patents/US6575052?utm_source=gb-gplus-sharePatent US6575052 - Pedal mechanism for operating brake and directional lock on lever-operated caster wheels
