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501,720 · Jenkinson · "Vault or Skylight Cover" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

501,720: 2 of 3

sheet metal troughs or ribs E and the metal cover C as shown in Figs. 2 and 3; while the end cross braces G' G'' are provided with feet of an inverted -shape, and they also serve to unite the braces to the other parts by rivets g, as shown in Figs. 2, 3 and 4.     Over the feet of the end cross braces G' G'' and under the lips formed on the corrugated ribs E and under the edges of the cover C, I place the metal frame J for the purpose of strength, as shown in Fig. 3.     In carrying out my invention I take any desired number of the corrugated sheet metal troughs or ribs E, place the lenses F in the latter so their lower edges will rest on the upper side of the feet e of the corrugated sheet metal troughs and their upper portions opposite the lens openings in the cover C, and then fill each corrugated trough or rib E with a layer of putty or other like material so that the lenses are surrounded or embedded in such material and thus firmly held in position. I then place a series of the corrugated sheet metal troughs or ribs E so that their respective light openings will coincide, arrange in proper position the sheet metal frames J, the end cross braces G' G'', middle cross brace G and rivet the parts together. It will be perceived that by this construction each of the

corrugated sheet metal troughs or ribs E and the portions of the putty concomitant thereto are independent of the remainder and consequently either can be removed separately and repaired or replaced by another without affecting the portions of the vault or skylight cover.     Another advantage is that the cover being constructed of sheet metal it can be produced at a low cost of manufacture and one that will last longer than those constructed of cast metal.     What I claim as new, and desire to secure by Letters Patent, is--     In a vault or skylight cover the combination with the sheet metal cover having lens openings contiguous to the lenses inclined upward, of a series of U-shaped corrugated sheet metal troughs or ribs with lips formed integrally therewith a lens to each hole embedded in putty or the like to coincide with the holes in the sheet metal cover and having transverse braces united to the cover and the corrugated troughs to strengthen the same, substantially as shown and described. JAMES JENKINS. Witnesses:     FRANCIS C. BOWEN,     JAS. S. EWBANK.