GB804929A - Improvements in or relating to glass reflecting lenses more particularly intended to be embedded in the ground - Google Patents

Abstract

804,929. Reflex reflectors. LEUBAZ, E. Aug. 21, 1956 [Aug. 22, 1955], No. 25472/56. Class 3(2) [Also in Group XX] A reflecting lens has a convex upper or front surface and a bottom or rear surface with several reflecting faces arranged in co-operating pairs at substantially a right angle and such that at least a part of a light pencil incident on the convex surface at a substantial angle of incidence, refracted on passing into the lens, and meeting one of said reflecting faces is reflected thereby on to the co-operating surface of the pair concerned, and is reflected back by the latter through the lens body in a direction parallel to that of its original passage through the body so as to emerge from the convex surface at a point nearer to the light source than the point of incidence. In Fig. 2, the lens 13 is shown mounted in the ground 18 and has a lower surface incorporating right-angled mirror surfaces 14 extending parallel to a lens diameter, except at the ends where they curve inwardly toward this diameter. Along this diameter spherical reflecting elements 15 may be provided. The co-operating mirror surfaces may be provided by the silvered bottom 22 of the lens and the walls of recesses 23 having an inverted cup-shape (Fig. 5); preferably the parts of the silvered rear lens surface adjacent to the recesses are slightly inclined to the horizontal. Instead of extending parallel to a lens diameter as in Fig. 2, the mirror surfaces may be arranged in step fashion. The right-angled mirror surfaces may also be arranged in sets 32, 33 as shown in Fig. 13, the sets being respectively operative for light coming in opposite directions. The lens may be mounted as shown in Fig. 15, in a cup 35 of cast iron through the intermediary of a resilient strip 36, the annular gap 37 being filled as by bitminous material. A horizontal flange 38 and vertical radial ribs 39 serve to anchor the mount in the ground or in a concrete setting.