US61580A

US61580A - Improved metallic pavement

Info

Publication number: US61580A
Authority: US
Publication date: 1867-01-29
Anticipated expiration: 1884-01-29

Description

uiten tetes stent ffice.

IMPROVBD METALLIC PAVEMENT.

dte .tlgchulr referat tu in tlgcsc itttcts zitent mit making part nf tire tuna.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN B. TARR, of Chicago, in the county of Cook, and State of Illinois, have invented a new and improved Metallic Pavement; and I do hereby declare that the following is a full, clear, and exact description thereof, reference beinglhad to the accompanying drawings, making a part of this specification,

in which Figurel is aperspeetive view ofltwo slabs of the metallic pavement put together.

Figure 2 is a toprviewY showing several slabs put together.

Figure' 3 is an edge view ot' onegof the slabs.

Figure 4 is a view showing apavement applied over an archway.

Similar letters of refercncendicatc corresponding parts in the several figures. v

This invention relates to an limprovement in the construction of metallic pavements for streets, sidewalks, halls, vaults, and for other purposes, where pavements are required. The object of my invention is to construct a metallic pavement of sections or slabs in such manner that when laid down one section or slab will support, as well as lirmly hold down in place, those slabs which are adjacent to it without the use of bolts, rivets, or

-other'fastenings than are aiorded by the slabs themselves, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings, iig. I is a perspective View of a portion of a pavement, the surfaces ofv thc slabs composing which are smoothivv In figs. 2 and 3 I have shown a pavement which is more particularly vdesigned for streets, it. having the surfaces of its slabs scored diagonally, so as to present projections for the purpose of affording-foothold for horses. These projections may be of the form represented, or ot' any other suitable form. Each slab A is'constructed of a rectangular form, either oblong or square, with'rectangular lipsa projecting from its corners, and also with intermediate steps or depressions Zn in two of its edges; which latter are made so as to receive,I each, two of the corner projections a in laying'down the pavement, as Shown in tig. 2. The depressions b b, which are'in the middle of the lengtliot' each slab A, receive theprojectionsof four slabs. The dep'th of the depressions b 11 is equal to the thickness of the projections a a, so that when thc slabs are put together their upper'surfaces will be tlush'with each other and perfectly level.' It will be seen by reference to figs. l and 2 that the slabs are put together so as to break joints with each other, and also so that the Projecting corners of euch slab t snugly into the intermediate depressions of two slabs, thus the slabs are not only held down in place without the use of separate fastenings. By thus forming the slabs they will be preventedfrom sinking, should the earthv beneath them settleand cease to aiord them support. I prefer to produce these slabs A ot' cast steel by casting this metal in metallic moulds, and,l while the metal is in a melted state, to subject it to great pressure for the purpose of expelling the air from it, and rendering it tougher andA more dense, so that the slabs will not be liable to break easily. By casting the slabs in this way they can all be made of a uniform size, and tted together strongly; and it will be found that the knobs or projections on their surfaces will' be chilled andv hardened so as' to be durable. I do not confine my invention to cast-steel slabs constructed as above described, as the slabs can bc made of cast iron, or even of wrought `iron. I con template employing the self-locking slabs 'fox-'vault covers, and casting themwith openings for receiving plates of glass for allowing light to pass through them. Y

Having thus described my invention, what I claim as new, and desire-to secure by yLetters Patent, is

The metallic-slabs A, constructed with Yinterlocking projections and depressions, substantially as described.

JOHN B. TARE.

Witnesses:

Enw. SCHAFER, -Hsnnr SYLVESTER.