The invention relates to a sensor device for indicating wear states on contact bodies of pantographs of electrically driven vehicles, said contact bodies being fixed to metallic supports. The aim of the invention is to provide a sensor device that permits, at practically any location on the contact strip,...http://www.google.com.au/patents/US7430922?utm_source=gb-gplus-sharePatent US7430922 - Sensor device for indicating wear states on contact bodies
