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Patents: 51 of 511
UNITED STATES PATENT OFFICE
THEODORE SHARTS, OF NEW YORK, N. Y.

IMPROVEMENT IN VAULT-COVERS.
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Theodore Sharts
1 of 5

Specification forming part of Letters Patent No. 138,204, dated April 22, 1873; application filed March 20, 1873.
To all whom it may concern:
    Be it known that I, THEODORE SHARTS, of the city, county, and State of New York, have invented a new and useful Improvement in Vault-Covers and Sidewalks; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing--
    Figure 1 represents a plan or top view of my invention partly finished. Fig. 2 is a longitudinal vertical section of the same.
    Similar letters indicate corresponding parts.
    This invention consists of a vault-cover or sidewalk made of a base-plate filled with concrete, and provided with obliquely-arranged spurs, shouldered flanges and openings for the reception of bulls'-eyes, all constructed and arranged as hereinafter set forth.
    In the drawing, the letter A designates a base-plate, which is made of cast-iron or any other suitable material, and in any desired form or shape. This base-plate is provided with side flanges a, and it may be made with one or more cells, according to its size and to the location for which it is intended. From the inner surface of said base-plate rise a number of oblique spurs, b, and the space or spaces inclosed by the flanges a is filled up with cement or concrete, which, when it has set, is firmly retained by the spurs b. Without these retaining spurs the cement or concrete is liable to work loose by the concussions to which
the vault-cover or sidewalk is exposed, and particularly when the cover or walk is turned upside down the concrete filling is liable to drop out. This defect is overcome by the retaining spurs. To furnish the vault-cover or sidewalk with bulls'-eyes c I provide the base-plate A with holes d, which are surrounded by flanges e to receive the bulls'-eyes, and to prevent them from getting displaced, until they are finally fastened in their places by the cement filling; and since the cement filling is firmly retained in position by the spurs b the bulls'-eyes will not be liable to work loose, and a firm and durable connection is effected between all the parts of the vault-cover or sidewalk.
    By these means I am enabled to produce a vault-cover or sidewalk which has the great advantage that it presents a good stepping surface, which is not liable to become slippery, and at the same time all the parts are firmly connected, and a durable and convenient article is produced.
    What I claim as new, and desire to secure by Letters Patent, is--
    In a vault-cover or sidewalk, the base-plate A filled with concrete, and provided with the obliquely-arranged spurs b b, holes d d, and shouldered flanges e e formed as shown, for the reception of bulls'-eyes c, substantially as described, for the purpose set forth.
THEODORE SHARTS.
Witnesses:
    W. HAUFF,
    E. G. KASTENHUBER.