Patent 7845284 was granted and assigned to Murata Machinery on December, 2010 by the United States Patent and Trademark Office.
A safety frame is provided to face a lid at a position where an article is held by an overhead traveling vehicle. A lower frame of the safety frame is movable upwardly relative to an upper frame of the safety frame. Further, an optical axis of a photoelectric sensor is provided between the lower frame and the upper frame.