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261,720 · Ingalls · "Illuminating-Tile" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

261,720: 2 of 6

I consider it the best of the anti-slipping iron plates, not because it is essential to my invention.     Let A designate the wall of the building, B the sidewalk, and C the vault or opening to be bridged or covered over with the illuminating-tiling.     D D are two of the sections of tiling or illuminating-plate, shown as laid in place and partly broken away. I will describe this construction in detail.     Around the opening C a groove or rabbet, a, is cut in the stone of the sidewalk B, and against the wall of the building A a bar, b, is fastened. These are to provide ledges for the tiles to rest on, which ledges I shall refer to by the letter e. The ledge on the building might be formed in the masonry, or that on the stone might be formed by fastening on a plate or bar, or by an extension upward from the supporting-girder, or otherwise, as circumstances may dictate.     E E are cross-beams or girders extending across the opening C, and which will be one or more in number, according to the size of the opening. The back end of each is fastened to or against the building by being set into the masonry, or by being cut out, as shown in Fig. 4, and resting on the bar b, or in an indentation therein, so as to bring their top surfaces on a level. The front end of each girder is cut away, as shown in Fig. 4, and rests in a notch cut in the stone B deeper than the rabbet a, and it has a spur, d, projecting down diagonally into the stone, as indicated, and packed with lead, so that it is securely fastened down. These girders E E may be of wrought T or I beam, or they may be cast.     The sections D D are two or more in number, and fit together edge to edge, the joints or seams formed by their meeting edges coming directly over the girders E E. When fitted together they appear as one large tile which has been cut transversely at intervals into sections, are arranged equidistantly and in symmetrical order, preferably in the manner shown in Fig. 1, and the knobs are disposed uniformly around them. The lenses and knobs extend over the dividing-joints without interruption, so that the design appears continuous over the entire composite tile. Each dividing-joint is formed through the centers of the lens-sockets in the row which extends over the girder B, the top of the latter being made of such width as to intercept the light from only this one row of sockets. These divided sockets are formed with bottom webs, as shown in Fig. 2, which strengthen the edges of the plates and serve as flanges to bolt through in order to fasten the sections to the girders,as shown in Figs. 1 and 2. The dividing-joint extends in zigzag direction through these sockets, as shown in Fig. 1, whereby the cutting of the projecting knobs is avoided and the joint is rendered less apparent than if it were straight. Each plate or section B thus has alternate projections and

indentations, which fit to and interlock with like projections and indentations in the edge of the adjoining section. The projecting portions of both plates extend beyond the center of the girder, so that a heavier weight on one plate than on the other is transmitted to both sides of the girder and has no tendency to tilt it, so that there is less likelihood of opening the joint and causing it to leak than if a straight joint were used. The sections B B are laid separately. Each is of such length as to extend across the opening C and rest on the ledges c c, to which it is fastened in any good way. For the fastening to the stone I have devised the method shown best in Fig. 3. The edge of the tile is notched at g g, Fig. 1, and opposite each notch a hole, h, is bored diagonally into the stone. Into this hole a pin or spike, i, is placed and packed with lead. Its head, which overhangs the edge of the plate D, is then battered or riveted down to make it confine the plate tightly. The sections D D are of two kinds--q end sections and middle sections-both of which are shown in Fig. 1. The end section shown at the right is cast with a margin, F, on three edges-that is, on its two opposite ends and one side. This margin is here shown as being a recess, e, of a depth equal to about half the thickness of the section or plate B, as shown in Figs. 3 and 4, and of a width which may equal that of the usual checkered border of the frame heretofore used. This checkered border is then formed on separate thin plates f f a series of which plates are laid in the recess e end to end, so as to break joints with the sections B, and are fastened down by screws. These plates serve to conceal the fastenings g i, as shown in Fig. 3. The middle sections, D, one of which is shown at the left in Fig. 1, have the margin F formed across only their ends, so that when laid these margins form continuations of those on the adjoining tiles. The plates f may be made the entire length of the margins around the composite tile, so that but one plate will be used for each of the four sides. The sections D D are laid and fastened down, as described. The joints between the sections and around the opening C are packed with cement or otherwise in any usual or good manner. The lenses are set in the sockets, including the blind sockets over the girders, and the border-plates f f are applied.     Fig. 5 shows a step, the plate B forming the tread, and a vertical plate, G, forming the riser. The two are united by an angle-plate, H, the upper portion of which forms the checked anti-slipping plate f, before described. I have shown this plate f as extending back but half the width of the border, the remainder of the latter being formed on the surface of the plate D. The angle-plate H is cast with the usual nosing, and is connected to the plates D and G by screws or bolts.     Instead of making the seams or joints between the separate plates D D by simply bringing