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394,260 · French · "Pavement and Floor Light" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

394,260: 2 of 3

use, the bed-plate is first placed in position. Next the lenses, surrounded by the ring coatings of flexible cement and incased in the taper metallic rings, are placed over the holes in the bed. Then a cement which becomes hard and unyielding when set-- preferably what is known as "concrete," made of Portland cement and sand-- is spread all over the face of the bed-plate, covering the ribs and tubes and filling the space between them full and filling in flush between the upper exposed edges of the lenses, so that the finished surface of the cement may be flush and even with the upper surfaces of the lenses.     In one end of the sheet of metal d' (represented in Fig. 3) is a slit or transverse hole, e, and on the other end of the same sheet of metal is a projecting tongue, f. When the sheet d' is bent into the form of a taper ring or casing, d, the tongue f may be passed through the slit e and bent over and clinched to fasten the ends of the sheet together.     What I claim as new, and desire to secure by Letters Patent, is--     1. In a pavement or floor light, the combination, with a perforated bed-plate or grating having upwardly-projecting strengthening-ribs, of tapered lenses having their larger ends downward, covering the perforations in the bed-plate, metallic rings surrounding said lenses at a distance therefrom and tapered to substantially correspond with the taper of the lenses, and annular bodies of elastic cement interposed between the lenses and the said metallic rings, providing for the expansion of the lenses and tapered to correspond to the

taper of the rings and lenses, the said lenses, elastic cement, and metallic rings resting upon the upper face of the bed-plate, and a body of hard cement spread upon the upper face of the bed-plate between the said metallic rings and ribs and covering the said ribs, and by which hard cement the lenses, elastic cement, and metallic rings are all firmly held in position, substantially as described and set forth.     2. In a pavement or floor light, the combination, with a perforated bed-plate or grating having upwardly-projecting strengthening-ribs, of tapering lenses having their larger ends resting upon the upper face of the bed-plate and covering the holes therein, metallic rings surrounding the said lenses at a distance therefrom and tapered to substantially correspond to the taper of the lenses, and annular bodies of elastic cement interposed between the lenses and said rings and tapered to correspond to the taper of the rings and lenses, the said elastic cement and metallic rings terminating at their tops a distance below the tops of the lenses, and a body of hard cement spread upon the upper face of the bed-plate between the metallic rings, covering the metallic rings and elastic cement, and also covering the strengthening-ribs, whereby only the upper surfaces of the lenses and of the body of hard cement are exposed to view, all substantially as described and set forth. JAMES C. FRENCH. Witnesses:     FREDK. HAYNES,     JOSEPH W. ROE.