An electrical box assembly that includes a box body having a screw mount aperture and a base insert slidably coupled into the box body. The base insert may include a back wall, and the back wall may have an electrical device aperture therethrough, a box mounting screw aperture therethrough, a center...http://www.google.de/patents/US7381890?utm_source=gb-gplus-sharePatent US7381890 - Recessed electrical outlet cover and box
