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170,567 · Ingalls · "Improvement in Vault-Covers" · Page 1 Home > Prism Glass > Patent Index > Page 1 |
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To all whom it may concern: Be it known that I, JOSHUA K. INGALLS, of the city, county, and State of New York, have invented certain Improvements in Illuminating Vault-Covers, of which the following is a specification: My invention relates to that class of vault-covers having a surface mainly of non-slippery material; and it consists essentially in lenses with a concave upper face set in a recessed or celled plate of metal, and surrounded by a safety-ring, forming a part of the said plate, which rises above the level of the lenses. The cellular interstices between the safety-rings may be filled with cement, concrete, or some similar material. In the drawings, Figure 1 is a plan of a portion of my improved cover. Fig. 2 is a vertical section of the same, taken in the plane indicated by the line x x in Fig. 1. In carrying out my invention, a plate, A, preferably of cast metal, is perforated for lenses B B, as shown at C C, where the lenses have been purposely omitted. The plate A is recessed to form cells between the glasses or lenses, leaving a thin bottom web and safety-rings b b around the lenses. These rings rise above the lenses, and their cement setting e, as shown, and protect their concave upper surfaces from abrasion. Webs a a connecting the rings b b, but not rising to their level, may be left for strength. The cells between the safety-rings are filled with some non-slippery material D, which may be concrete, composed or sand or gravel and cement-- |
Portland cement being preferred-- or with a bond composed of melted
sulphur, sand, and coal-tar or asphaltum or other fusible mixture; or
blocks of artificial stone may be fitted to the cells fixed with cement. For the better illustration of my construction, I have shown that portion of the plate to the right hand denuded of the concrete filling. The lens B rests on a flange or shoulder, c, and it may be secured in place by means of cement, e, or by any method known to the trade. These rings b b may be flush with the general level of the concrete D, or may rise slightly above it. They form not only a protection to the lenses and their cement, but a disconnected traction surface to prevent slipping. I am fully aware that the combination of lenses, a metal plate, and concrete filling is old, and I make no broad claim to it; but What I do claim is-- In a vault-cover composed mainly of metal and glass, the combination of the lenses B B, having a concave upper surface, and the safety-rings b b, surrounding said lenses, and rising above their level, as shown, to protect them from abrasion, and prevent the loosening of the cement, substantially as specified. In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.
SAM. TRO. SMITH, HENRY CONNETT. |