electrified railway, especially in the electrification of shelving metal, and process for its production

摘要

An electrified rail, particularly for the electrification of metal shelving units provided on their front of electronic labels, displays and/or other peripherals, the rail being of the kind comprising a body (1, 100) of electrically insulating plastic material, provided with longitudinal slots (3) suitably distanced to each other, in every one of which a wire or strand (4) of electrically conducting metal which is surrounded for more than 180° of its cross section by the internal walls of the respective slot (3), to be friction-held in it, so that for the remaining section the same wire (4) is free and can be reached by an electric contact useful to connect the wire to a plug or to an electric or electronic device, fixed to said body (1, 100) of the rail, characterized in that the body (1, 100) of the rail is formed in a monolithic way of polycarbonate (PC) or polyphenylene oxide (PPO) and/or other resins having suitable mechanical characteristics, with high electric insulation and with high heat resistance, preferably self-extinguishing, and in that said slots (3) containing electric wires (4) are such and are disposed in such a way that, if after the extrusion step the still hot rail is transversally flexed, slots (3) themselves outwardly open to ease the insertion of electric wires, slots (3) being provided on their bottom of longitudinal middle grooves (6) having the width and depth necessary to allow a transversal elastic deformation of the rail itself during its manufacturing, with the formation of an oscillating fulcrum in correspondence of grooves (6), which is parallel to the longitudinal axis of the grooves (6), whose width is inferior to the width (D) of the outward opening mouth of slots (3) for holding electric wires (4), said slots (3) being positioned one beside the other, and after the surrounding and holding of the wires (4) the slots are open on a visible planar side (102) of the rail body (1, 100) with longitudinal mouths (103) having a width (D) always inferior to the diameter of wires (4); the depth of slot (3) being perpendicular to said visible side (102) and having a value (C') sufficient for wire (4) to be ditched and protected in the slot (3) surrounding the wires (4) for more than 180° of their section, the wires (4) being held in slots (3) by the toughness and structural non-deformability of the material forming the monolithic body (1, 100) of the rail itself, while through the narrow mouths (103) of said slots (3) every electric wire (4) can be reached by the spring-loaded contacts (32) of plugs (29) or of devices (33) mounted on the monolithic body itself (1, 100) of the rail, wherein the base (2) of body (1, 100) of the rail is provided on its inferior side (2) with small longitudinal grooves (9) having dimensions equal or different from the bottom grooves (6) of slots (3) holding electric wires (4), said bottom longitudinal grooves being in an offset symmetrical position with respect to the slot longitudinal grooves (6), capable of allowing a transversal deformation of the rail during its production.