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257,714 · Hyatt · "Illuminating Vault-Cover or Grating" · Page 1
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Patents: 130 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF NEW YORK, N. Y., ASSIGNOR TO
ELIZABETH ADELAIDE LAKE HYATT, OF SAME PLACE.

ILLUMINATING VAULT-COVER OR GRATING.
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Thaddeus Hyatt
46 of 67

SPECIFICATION forming part of Letters Patent No. 257,714, dated May 9, 1882.
Application filed April 14, 1882. (No model.)
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, a citizen of the United States, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Illuminating Vault-Covers or Gratings and Building Constructions made therefrom, of which the following is a specification.
    In the accompanying drawings, making part of this specification, like letters refer to like parts in all the figures.
    Figure 1 represents a "concrete light" or grating made of artificial stone and set with glasses. A A show the stone or concrete grating; B B, the glasses; a a, gutters or water-courses formed in the concrete; b b, tie metals, or the metallic tensional strength of the concrete grating.
    Fig. 2 represents the concrete light faced with a soft-metal plate. C C show the soft-metal plate.
    Fig. 3 represents the soft-metal plate C C before being attached to the concrete grating. a' a' show gutters or water-courses cast or formed in the surface of the plate; c c, attachment pieces or rings cast or formed upon the under face of the plate.
    Fig. 4 represents an enlarged cross-section of Fig. 2 on the line x x.
    Fig. 5 represents a cast-iron grating covered with concrete, faced with soft metal, and set with glasses. D D show the cast-iron grating; A" A", the concrete; C C, the soft-metal surface-plate.
    Fig. 6 is an enlarged cross-section of Fig. 5 on the line y y. B" B" show the shoulder and neck of the glasses where they enter the light-openings of the grating and are cemented fast.
    Fig. 7 is a full-size view of a portion of the lead plate.
    The object of my invention, with respect to the illuminating-gratings called "concrete lights," is to make them ornamental by means of a channeled surface, which at the same time aids to free the face of the glasses from dust and dirt.
    The object of my invention broadly, as to illuminating-gratings faced with soft metal, is to lessen the cost of making such lights, the purpose of the gutters made in the face of the soft-metal plate being the same as with respect to gutters made in the face of the concrete grating.
    Fig. 2 represents the cheapest mode of construction, and is the manufacture I prefer. In making a concrete light such as Fig. 1 represents I cast the concrete in a mold so formed as to leave the face of the concrete guttered, as shown, when the concrete is removed from the mold; and I prefer to cast the concrete grating in a mold formed with cores to produce the openings or light-holes to be set with glasses after the concrete grating has become set and hard. The tie metals I place in the mold with the plastic concrete. In making a concrete light faced with soft metal, as shown by Fig. 2, I place the metal plate face downward in the mold, and then put in the plastic concrete upon it, adding either tie metals or a cast iron grating. The soft-metal facing-plate represented by Fig. 3 I prefer to make of lead, and I make the holdfasts c c preferably in the form of rings, as shown.
    The mode of fastening a soft metal foot-surface to illuminating-gratings by means of hold-fasts upon the under face of the soft-metal plates in combination with concrete I find to be cheaper and more convenient than my former method of attachment by means either of screws or "sweating," and to be equally efficacious.
    What I claim as my invention, and desire to secure by Letters Patent, is--
    1. A concrete light or illuminating stone grating formed with a channeled foot-surface, substantially as and for the purposes herein set forth and illustrated.
    2. A concrete light or illuminating stone grating formed with a soft-metal foot-surface, substantially as and for the purposes herein set forth and illustrated.
    3. A cast-iron illuminating-grating, combined with a soft-metal facing-plate and concrete, substantially as and for the purposes herein set forth and illustrated.
    4. A soft-metal perforated facing-plate formed with holdfasts and a channeled face, in combination with an illuminating-grating, substantially as and for the purposes herein set forth and illustrated.
THADDEUS HYATT.
Witnesses:
    T. C. BRECHT,
    LLOYD F. KELEHER.