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Patents: 54 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF ATCHISON, KANSAS.

IMPROVEMENT IN ILLUMINATING VAULT-COVERS.
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Thaddeus Hyatt
9 of 67

Specification forming part of Letters Patent No. 140,709, dated July 8, 1873; application filed December 23, 1870.
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, of New York city, county, and State, formerly of Atchison, Kansas, have invented certain new and useful Improvements in Plates for Sidewalks; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings making a part of this specification, in which--
    Figure 1 is a plan view of the upper side of a section of a plate containing my improvements. Fig. 2 is a cross-section of the same. Fig. 3 is a longitudinal section upon a line extending through the center of one of the ridges; and Figs. 4, 5, and 6 are like views of a plate provided with larger glasses, which have a square form.
    Letters of like name and kind refer to like parts in each of the figures.
    The design of my invention is to furnish an illuminated covering for areas, coal-vaults, &c., in which the glass lenses shall be protected in a great degree from abrasion by dust upon the feet of persons walking over the same; and it consists in a corrugated illuminating pavement-plate in which the lenses are placed wholly or in part within the sides of the ridges, substantially as and for the purpose hereinafter specified.
    In the annexed drawing, A represents a metal pavement-plate, corrugated so as to produce upon its surface a series of ridges, B, and which are separated by intervening furrows or grooves C, said ridges and grooves being formed transversely upon curved lines, as shown. Within the sides of each furrow B is provided a series of openings, b, which have preferably a circular form, and contain each a correspondingly-shaped glass lens, D, that is suitably cemented in place, so as to form a water-tight joint. The surface of each lens corresponds to the conformation of the plate, so
as to preserve the uniformity of the same, and, as nearly the whole of said lens is below the highest portion of the ridge in which it is inserted, it will be seen that but a small portion of its upper surface is exposed to contact with the feet of persons passing over the plate, and consequently only such exposed portion can become abraded so as to diminish the light-transmitting qualities of the glass.
    In figs. 4, 5, and 6 is shown a modification of my invention, in which the lenses are increased in relative dimensions, so as to cause each to form a part of two or more ridges and furrows. When applied in this manner the light-transmitting capacity of the pavement is materially increased, while as great a proportion of the surface of each lens is protected from abrasive action.
    Dust and water falling into the furrows will usually pass away without attention, but, if necessary can easily be removed with a broom, so as to leave those portions of the lens which are below the upper side of the ridges unobstructed.
    The pavement-plate thus constructed possesses greater illuminating capacity than could be obtained by the use of a plane surface, while from the absence of all protuberances upon its upper surface said plate affords an easy and desirable footway.
    Having thus fully set forth the nature and merits of my invention, what I claim as new is--
    A corrugated illuminating pavement-plate in which the lenses are placed wholly or in part within the sides of the ridges, substantially as and for the purpose specified.
    In testimony that I claim the foregoing I have hereunto set my hand this 18th day of November, 1870.
THADDEUS HYATT.
Witnesses:
    J. F. HUTTNER,
    A. W. LAKE.