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211,297 · Dale · "Improvement in Illuminating Tiles for Covering Vaults, &c." · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

211,297: 2 of 4

is cast, forming a rabbeted supporting-seat, d¹, for the adjacent edge of the next tile to rest upon, as is clearly shown in Fig. 2.     A little space should be left at e between the adjacent edges of the tiles, and also between the outer edges of the same and the stone coping, to be filled with cement. All around the periphery of each tile a flange or rim, d², rises vertically the thickness of the cement to be applied within the same, which flange need not be more than from an eighth to one-fourth of an inch in thickness.     The sectional tiles may be all completed at the shop by inserting the glasses and the cement, leaving, however, small spaces, as at f f, free from cement, for inserting screws, to be afterward filled, with cement. The tiles thus prepared are laid down upon a thin bed of cement, and screwed or bolted to their seats and to each other where they overlap, and there the seams around and between them are filled with hot cement, making a thoroughly water-tight cover, without any surrounding metal frame and with very little metal exposed upon the surface.     When the strengthening-rib d is cast with a solid metal web on its lower side, as shown in Figs. 3, 4, 7, and 8, said web will, in some degree, obstruct the rays of light passing obliquely through the glasses. To obviate this I sometimes cast said rib shallow, or without the web, and re-enforce it by means of a truss, consisting of a tension-rod, g, connecting two lags, h h, cast upon the rib and braced outward by a strut, i, at its center, as shown in Figs. 5 and 6.     When the tile is unusually long I employ two additional struts, placed intermediately between the center strut, i, and the lags h h. The tension-rod is adjustable to any desired degree of tautness by means of screws and nuts, as shown at h h. I consider this truss as a re-enforce to illuminating-tiles, especially applicable to steps and risers.     I do not claim a sectional extension-area or

vault cover composed of sectional tiles inserted in or supported by a metallic frame, whether cast entire or made in sections, as described and shown in Letters Patent granted to T. Hyatt, July 23, 1878; nor do I claim a sectional tile of any construction adapted or designed to be set into or supported by a metal frame cast entire or made in sections, as aforesaid; but     What I claim as my invention, and desire to secure by Letters Patent, is--     1. An extension-area or vault cover composed of sectional illuminating-tiles, each tile (save one) having cast integrally therewith at one edge a strengthening-rib, projecting laterally to form a seat for the next adjacent tile to rest upon, and all fitted directly into the stone coping without any surrounding or supporting metal frame, substantially as described.     2. The illuminating sectional tile D, having cast thereon at one edge a strengthening-rib, d, with a lateral projection, d¹, forming a seat for the next adjacent tile to rest upon, adapted to be laid in an extension-area or vault cover without any surrounding or supporting metal frame, substantially as described.     3. In combination with an illuminating-tile having a shallow strengthening-rib cast integrally therewith, as described, the lags h h, adjustable tension-rod g, and strut i, forming a re-enforcing truss, substantially as and for the purpose described.     4. In combination with illuminating steps and risers, as described, a re-enforcing truss applied to said steps and risers, or either of them, consisting of the lags h h, adjustable tension-rod, and strut i, substantially as shown in Fig. 6 of the drawings.     In testimony that I claim the foregoing I have hereunto set my hand in the presence of the subscribing witnesses. WILLIAM DALE. [L.S.] Witnesses:     WM. P. YOUNG,     VINTON COOMBS.