Information box adapted to be attached to the post of a bus stop or tram stop indicator

An information box adapted to be attached to the post of a bus stop or tram stop indicator, comprising a cover, a bottom, and a set of information carriers together forming a substantially prismatic structure and enclosed between the cover and the bottom, a tube attachable to said post and provided with at least one outwardly projecting upstanding rib, but otherwise having a cylindrical outer surface through at least part of its height, each rib being provided with two spaced superposed incisions within the zone of said cylindrical outer surface, and an upper ring and a lower ring, connectable with the cover and the bottom, respectively, the cover, the bottom and the rings being provided with passage holes having the same circumference as the tube so that they may be slid on the tube, a groove provided in the inner surface of the passage hole of the rings for receiving the ribs when the rings are slid onto the tube, and the rings being rotatable at the level of the incisions from a slide-on position into an operative position in which they are guarded against vertical displacement by the rib or ribs.