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257,715 · Hyatt · "Pavement-Plate or Vault-Cover" · Page 1
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Patents: 131 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF NEW YORK, N. Y., ASSIGNOR TO
ELIZABETH ADELAIDE LAKE HYATT, OF SAME PLACE.

PAVEMENT-PLATE VAULT-COVER.
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Thaddeus Hyatt
47 of 67

SPECIFICATION forming part of Letters Patent No. 257,715, dated May 9, 1882.
Application filed April 11, 1882. (No model.) Patented in England October 18, 1873.
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 Pavement-Plates or Vault-Covers, of which the following is a specification.
    The object of my invention is, by means of lead plating or veneering, to prevent the foot-surface of iron coal-hole plates and plates used to form the approaches to buildings over sunk areas and otherwise-- as platforms, stoops, steps, and sills-- from becoming slippery and dangerous by foot-wear.
    In the drawings attached hereto and making part of this specification, like letters refer to like parts in all the figures.
    Figure 1 represents a lead-plated coal-hole plate, tile, grating, &c. Fig. 2 represents a lead-plated coal-hole plate, tile, or grating with apertures blocked by glass. Fig. 3 represents a lead-plated supporting frame or foundation employed to connect a number of lead-plated tiles into a larger and more extended surface.
    A is a cast-iron plate, cover, tile, or grating; B, lead surface or veneer of same; C, glasses; D, lead-plated supporting-frame or gratings-foundation.
    The method adopted to plate the iron with lead forms no part of my invention. It may be done in any well-known manner. The mode which I have successfully adopted in practice
is to attach the lead to the iron by the process known as "sweating," the iron for this purpose being first cleaned and faced with tin, solder, or other metal or alloy; and the under face of the lead veneer having been also made clean and bright, the lead is laid upon the face of the iron and the two metals made sufficiently hot to unite by rubbing and pressure.
    I employ iron plates thus veneered as treads in the construction of stoops and flights of steps, and for the platforms of stoops over sunk areas, and for the sills of doorways, and for coal-hole plates in sidewalks, and for roofing-plates in the construction of roof-pavements; and I make them perforated to admit light and air, and I block the perforations with glass when light only without air is wanted.
    What claim as my invention, and desire to secure by Letters Patent, is--
    1. Safe foot-surfaces formed upon metal pavement-plates, tiles, gratings, or covers, and upon foot-surface constructions made therefrom, by means of lead veneers, substantially as and for the purposes herein set forth and illustrated.
    2. Illuminating or glass set lead plated foot-surface plates and constructions, substantially as and for the purposes herein set forth and illustrated.
THADDEUS HYATT.
Witnesses:
    T. C. BRECHT,
    LLOYD F. KELEHER.