Reflecting device for public street lighting appliances and lighting appliances fitted with this device

Claim 1

A PUBLIC LIGHTING APPLIANCE COMPRISING AN ELONGATED DOWNWARDLY OPENING CONCAVE REFLECTOR ADAPTED TO BE SUPPORTED ABOVE ONE SIDE OF A STREET WITH THE CENTRAL VERTICAL LONGITUDINAL PLANE OF THE REFLECTOR SUBSTANTIALLY TRANSVERSE TO THE STREET, THE REFLECTOR HAVING A DOWNWARDLY REFLECTING DOME AT ITS TOP SURROUNDED BY AN INTERMEDIATE REFLECTING BAND THAT CONNECTS THE LOWER EDGE OF THE DOME TO THE UPPER EDGE OF A MAIN REFLECTING BAND EXTENDING AROUND THE LOWER EDGE OF THE INTERMEDIATE BAND, A BALLON-SHAPED LAMP DISPOSED IN THE REFLECTOR IN THE AREA SURROUNDED BY THE MAIN BAND AND NEAR THE END OF THE REFLECTOR AWAY FROM THE STREEN AND LAMP-SUPPORTING MEANS CONNECTED TO SAID END OF THE REFLECTOR, THE INTERSECTION OF THE DOME AND SAID PLANE FORMING A PARABOLA EXTENDING LENGTHWISE OF THE REFLECTOR AND HAVING ITS FOCUS WITHIN THE LAMP, THE DOME ALSO BEING IN THE FORM TRANSVERSELY OF PARABOLAS INTERSECTING AT THEIR APICES SAID FIRST-MENTIONED PARABOLA AT RIGHT ANGLES THERETO AND HAVING THEIR FOCI ALONG A LINE EXTENDING LENGTHWISE OF THE REFLECTOR ABOVE SAID FOCUS, AND EACH OF SAID REFLECTING BANDS BEING IN THE SHAPE OF A PAIR OF PARABOLOIDS SYMMETRICAL WITH REFERENCE TO SAID PLANE, THE INTERMEIDATE REFLECTING BAND BEING POSITIONED TO ILLUMINATE THE AREA OF THE STREET AT EACH SIDE OF SAID PLANE BETWEEN THE AREAS ILLUMINATED BY SAID DOME AND MAIN REFLECTING BAND.