US101100A - Improved street pavement - Google Patents

Description

tnittd tattt time @twine Laws Pfam N 101,100, atea Match 22, 1370.

IMPROVED STREET PAVEMENT.

The Schedule referred to in these Letters Patent and making part of the same,

To whom it 'mail concern.-

Beit known that I, I). C. COLBY, of XVaShingtOn, in the county of Washington and District of Columbia, have, as I believe, invented new and useful Improvements in Street Pavements, of Vood and Concrete; and I do hereby declare the following to be a full and exact description of the same. reference being had to the drawings that accompany and form a' part oi' these specifications.

Figure l is a perspective view of a portion of my pavement laid.

Figure 2, wooden blocks, such as'are set to form the upper structure of my pavement.

Letter A, one ot the full-sized blocks, having six plane sides, and its angles right angles. 'a

B, the space between alternate rows of the blocks, the'se arranged in lilies crosswise the street, and the spaces corresponding.

O and I), strips ot' wood lying along the base ofthe blocks A and at the bottom of the spaces B. 'lhe peculiar formation' and arrangement of these strips will be more fully lureinafter -f et forth, with the reasons therefor.

' E, planking, forming the substructure, which should be laid on a well-prepared bed oi"1 gravel. p

F, thick plank, ruiming erosswise beneath the abnt`- ting ends oi" the planks It.

The objects of my invention are to secure a block'- pavement that shall be very economical as to the iitting ot' the lumber and laying the same, and to provide with more certainty the permanent position of the blocks, although arranged in suoli a manner that any number of the said blocks may be readily removed and replaced, when it should become necessary to reach the street below for any purpose.

My blocks have simple plane sides, but to prevent any of the iine particles from the concrete or filling in the upper part of the spaces B from falling downv and working their way beneath the blocks A, I use two strips, C and I), each varying in thickness as to its two opposite edges. Before using, I slightly tack the two together, as illustrated on the right of tig. 1.

Now, having the substructure in readiness, I stand a row of blocks at the place of beginning, across the street from curb-stone to curb-stone, then take the compound strips C and I) and place them inposition, as illustrated on the right of fig. l of the drawings, a

line oi' these extending quite across in front of the said line of blocks, and resting upon the substructure E. i

It will be observed that "one of the strips O and D lies higher up than its fellow, and that the two sides in Contact are beveling, so that,\\.after a series of rows of the blocks A and the compound strips are laid, and the iilling for the spaces B above these strips is 'to be tamped in, the pressure thus brought to bear upon the top of I) will force it down to a level with its fellow O, and the result will be to fill entirely and closely the lowerpart of the space B, and not only prevent all fine parts from above from falling down', but also keep the blocks more surely in place.

rIhe blocks may be six inches or more deep, three inches or so thick, and ot' such width as the lumber fronLwhich they are being formed may suggest.

The spaces B, if to be lled with small sand and gravel, may well be not more than one ineh wide; but j if to be filled with small stones, broken stone, "coarse concrete, andthe like, 4they may be two inches o'r more.v

We recommend to have these spaces wide, and as much coarse material used in filling as can be, and still form a goed, tenacious, and hard concrete.

A broken stone, gravel, or cement substructure may well, on firm soils, be substituted for the wooden plank E.

I do not claim rising the substructure E, nor lling the spaces B with gravel, concrete, or stone, as my invention consists in making use of the two str ips O and D ,so formed and laid that they shall more fully fill the lower portion of the spaces B laterally when the filling above has been forced down, as hereinbefore explained.

What I claim as of my invention, and desire to secure by Letters Patent, is-

The two strips O and D, when used in combination with the blocks A, and formed to operate substantially as described and set forth.

.In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

D. O. COIJBY.

XVitnesses It. H. MAnsn, J. F. Gonny.

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