The present invention relates to a shredder that includes a housing having a movable part that forms at least a part of an opening for the insertion of articles to be fed into the shredder. A detector detects motion of the movable part, and in response, a controller performs a predetermined operation,...http://www.google.de/patents/US7661614?utm_source=gb-gplus-sharePatent US7661614 - Shredder throat safety system
