Abstract: A sign box has a translucent front panel of flexible material which is attached to the longitudinal edges of a reflector of channel-shape, and which is stretched and tensioned by forcing the longitudinal edges of the reflector away from each other by means of reaction members contained within the reflector.

Abstract: A frame construction for an illuminated sign comprises a metal sheathing on both top and bottom frame members of the frame, the sheathing being bent at its longitudinal edges to form longitudinally extending grooves, wherein both the top and the bottom frame members having longitudinally extending flanges inserted in the sheathing, while the longitudinal grooves of the sheathing are employed for mounting partly translucent front sheets, end frame members of the frame including tongues extending perpendicular thereto which are insertable into cavities formed by the longitudinal bent portions of the sheathing.

Abstract: The invention relates to an oblong sign board casing comprising a reflector sheet provided with parallel embossings extending in planes substantially perpendicular to a longitudinal axis. The profiled reflector sheet is curved about 90.degree. round a longitudinal axis, whereby a self-supporting construction is obtained. This construction renders it possible to provide the front plate with a flange and a sharp edge at the bottom. The embossings cause an effective diffusion of the light, also towards the bottom face.