US107576A

US107576A - Improvement in bridges

Info

Publication number: US107576A
Authority: US
Publication date: 1870-09-20
Anticipated expiration: 1887-09-20

Description

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Letters Patent No. 107,576, dated September 20, 1870.

IMPROVEMENT IN BRIDGES.

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

To all lwhom it may concer-n Beit known that I, ISAAC H. WHEnLnR, of Scioto-l ville, in the county of Scioto and State of Ohio, have y invented a new and useful Improvement in Bridges; and I do hereby declare that the following is a full, clear, and exact description thereof',l which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specitication.

My invention relates to wooden bridges, and has toi" its object to render unnecessary a large amount of the material now used, to remove from the bridgev a great deal of dead weight, and to reduce the cost of construction.

My invention consists in combining wit-h the upper, lower, and middle chords, diagonal ,truss and short braces, as hereinafter specified.

Figure l represents a longitudinal sectional elevation of a bridge constructed according to my improved plan;

Figure 2 is a plan view,'partly broken out and Figure 3 is a transverse sectional elevation of the same.'

A represents the lower chords;

B, the upper chordsyand C, the intermediate chords, which I propose to introduce. Y

D represents the posts; l

E, the diagonal truss-braces; an

F, the short braces, which I introduce between the lower and middle chords and the middle and upper chords.

The top laterals, I, cross each other above the ties- K and at the sides of the chords, and one of each of the crossing-braces is gained into the top of the chord,

as shown in the plan viewat L.

The-braces are also bolted down to the cross-ties by braces, M, all making a very strong connection.

The posts D and trusses E aregaiued into the sides i 'of' the lower and middlechords, and bolted together' by bolts, N, in a way to make the labor of const-ruction very simple, and much less than in other bridges.

The span may be made very much vlarger by this improved arrangement, the single truss having .a capacity to sustain spans of one hundred and seventyive to two hundred feet, while two' hundred and fifty to three hundred feet may be safely spannedwith the double truss. There is no dead or useless timber in it. Every piece of timber used is a brace or support to the whole, in some material way,'and the heaviest iron used in common road-bridges are tlneefquarter inch bolts, andbut few of these.

Having thus described my invention, l claim as new and desire to secure by Letters Patent- In wooden bridges, the combination of chords A B f XVitnesses:

C. LEVY, T. A. SOWEL.