A junction box which includes a case having fastened therein a plug socket mounting plate with a plurality of plug sockets respectively mounted thereon at three locations; a raised, frame-shaped block at the inside for mounting a rubber packing and a frame-shaped bevel flange; a cover plate pivoted to...http://www.google.fr/patents/US5179252?utm_source=gb-gplus-shareBrevet US5179252 - Structure of floor junction box
