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375,101 · Sharts · "Manufacture of Illuminating Tiles for Sidewalks, &c." · Page 1
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UNITED STATES PATENT OFFICE
THEODORE SHARTS, OF NEW YORK, N. Y.

MANUFACTURE OF ILLUMINATING-TILES FOR SIDEWALKS, &c.
First: 138,204 · Sharts · "Improvement in Vault-Covers" · Page 1 Last: 432,249 · Sharts · "Concrete Illuminating-Tile" · Drawing Prev: 138,204 · Sharts · "Improvement in Vault-Covers" · Page 1 Next: 378,558 · Sharts · "Illuminating-Tile" · Page 1 Navigation
Theodore Sharts
2 of 5

SPECIFICATION forming part of Letters Patent No. 375,101, dated December 20, 1887.
Application filed August 23, 1887. Serial No. 247,640. (No model.)
To all whom it may concern:
    Be it known that I, THEODORE SHARTS, a citizen of the United States, residing in the city, county, and State of New York, have invented a new and useful Improvement in the Manufacture of Illuminating-Tiles for Sidewalks, Areas, Roofs, Stoops, &c., of which the following is a specification.
    My invention relates to the construction of the supporting-bars for illuminating-tiles, the construction of the tiles, and the method of fastening the tiles to the supporting-bars, by which great economy is secured in the cost of the manufacture of the tiles, &c.
    In the drawings that serve to illustrate my invention, Figure 1 is a top view of two sections of illuminating tiles or gratings, their junctions being over the center line of the underling supporting-bar, with glass lenses over the light-openings of the tiles and a concrete filling, upon the tiles flush with the surface of the lenses, a part of the concrete being broken away, exposing the bed-plate of the tiles, the screw-bolts, nuts, &c. Fig. 2 is a longitudinal vertical section taken on the line X X of Fig. 1. Fig. 3 is a top view of two sections of old-style iron and glass illuminating-tiles with their junction over the center line of the underlying supporting-bar and glass lenses inserted in the light-openings. Fig. 4 is a longitudinal vertical section taken on the line Y Y of Fig. 3.
    Similar letters indicate corresponding parts.
    The letter A designates the bed plate or grating of the tiles filled with concrete; A', the grating of the old-style iron and glass tile; B and B', the supporting-bars underlying the tiles at their junctions; C and C', the inverted screw-bolts, their heads being embedded in the supporting-bars; D, the glass lenses of the concrete tiles; B, the concrete filling; a and a', the light-openings through the tiles; b and b', the top surfaces of the supporting-bars; e and e', the nuts on the screw-bolts; f, the filling in the recesses of the knob-tiles covering the nuts and screw-bolts; D', the glass lenses of the old-style iron tiles; g', the half-round recesses in the iron and glass tile; F and F', the upper ends of the rivets.
    Manufacturers of illuminating-tiles, vault-lights, &c., have been accustomed in preparing their tiles or gratings and supporting-bars
to drill and countersink a series of holes for the reception of screw-bolts at proper intervals along or near the edge of the gratings. These gratings are then placed in the positions they are to occupy on the supporting-bars, the gratings forming a junction with each other over the center line of the supporting-bars. Holes are then drilled into or through the flanges of the supporting-bars to correspond with those on the tiling above for the reception of screw-bolts. These holes are then either tapped to fit the screw of the screw-bolt or bored through the flanges of the supporting-bar and a screw-bolt inserted and fastened by a nut. The two rows of bolt-holes of the gratings necessitates a bearing-beam to have a top surface sufficiently wide to allow the drilling of the holes into them. Most of this drilling is generally done on the ground where the work is to be placed. Consequently only hand-drills and taps can be used. This process forms a large item of the expense of manufacturing and placing in position the illuminating tiles or gratings. To economize this expense in the saving of time, labor, wear and tear of tools, &c., is the object of my invention.
    This result is accomplished, first, by having screw-bolts C and C' with their heads embedded in the castings of the supporting-bars B and B' at proper intervals along the center line, the screw part of the bolt protruding upward from the supporting-bars. The heads of these bolts are set into the "patterns" of the supporting-bar at the foundry-say half an inch below the surface of the supporting-bar-- the remaining screw part being embedded in the sand of the "cope." When the cope is raised, the screw-bolts will be covered in the sand, except the portion which is sunk in the pattern of the supporting-bar. The pattern being withdrawn from the sand and the cope again closed over the mold, the heads of the screw-bolts protruding from the cope will hang downward into the cavity of the mold. The melted iron flowing into the mold will surround the exposed portion of the screw-bolts, so, when the castings cool, the heads of the screw-bolts will be found firmly embedded in the casting, the screw part of the bolt protruding upward.
    Second. Along the edges of the "patterns"