USRE2586E - David hammond - Google Patents

Description

DAVID HAMMOND; or CANTON,v oHIo. ,y Letters Patent No. 56,043, dated July 3, 1866; reissue No. 2,586, dated April '30, 1867.

IMPROVEMENT In BRIDGES.

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TO ALL Wl-IOM IT MAY GONCERN: I

Be it known that I, DAVID HAMMOND, 'of Canton, in the county of Stark, and State of Ohio, have invented new and useful improvements in Wrought-Iron Trussed-Girders for Bridges or other structures; and I do hereby.

declare that the following is a full, clear, and exact description thereof, reference being hadto the accompanying drawings, forming a part oi this specification, and to the letters of reference marked thereon, of which drawings4 l l' Figurel is a side View of girder applied to a bridge.

Figure 2 is a half plan of same.

Figure 3 is a cross-section ofbridge at the centre.

Figure 4is the details of the double-bolted clamping piece.v

vFigure 5 is a top view ci' double clamping pieces when used in connection with the supporting rods.

Figure 6 is the details of the single-bolted clamping piece. I

lFigure 7 isan ,elevation of the securing clamp for covering piece.

The nature of my invention consists, first, in the novel construction of a wrought-iron arch of double-T iron, arranged with clamping pieces and covering pieces, as hereinafter shown,whcreby an arch of great strength and stability is obtained; second, in the novel construction of the clamping pieces which connect the two parts of the arch; and, lastly,in the-'novel construction of the securing pieces, which secure the coveringpiece to the arch. A

To enable others skilled iu the art to make and use my invention, I will proceed to describe its construction and application. Y

The arch B'is made'up of two arches of double-T iron placed parallel to each other, each arch of which is composed of pieces of double-T iron, curved toV the proper,curvature, and with their adjacent ends butting squarely against each other. The clamping'pieces D andfl? are inserted between these two arches, and have the bolts M, which 4pass through the web of the double-T iron, and are securedl by nuts lon the outside, thu-s rmly connecting the two parts of the arch. i These clamping pieces are'of/a novel construction, being either single qrldouble-b'olted. The double-bolted clamping piece, shown in iig. il in detail, is made with the holes WWwhen used simply as a clamping piece, the bolts M- passing through the holes W; but when this piece is also used as an aid in seuring the Asupporting-rods, it is medcas indicated by dotted lines in tig. 4, and top view of which is shown in tig. 5, the supporting-rod passing through the hole N, and being secured by a. nut on the top, the bolts M being-made with the clamping piece. The single-bolted clamping pieces P, shown in detail in g. 6, have the hole vN, through which pass the braces E', these-clamping pieces, by the peculiarv construction, allowing of rotation, sofas to adapt them to any position'of the braces E, for which they are more particularly adapted. The ends of the arch are connected by the chords A A and bolts S S, which bolts pass through the ends of the arch, the ends oi' the chords and east-iron blocks, which are put into till up the space in and between the double-T irons, and to keep the two ends of the chord apart, thus firmly securing the ends of the arch and the ehordsto each other. The suspension-rods F pass through the head of the braces X, und through the iron G,

and through the to'p or covering piece H, being secured by the nuts T T, or a double clamping-piecc,of the construction shown in figs.` 4 and 5, may be used, the rstimode being the one I prefer. The suspension-rods-F pass between the chords A A, and are cnt 1n so as to form a place to receive the chords, which chords are secured to rods F by bolts, as shown. The string pieces are laid on the chords 'A, and either `bolted. to the suspensionxods F orsecured by bolts' passing through the iianges of the string piece, and dow. between-the chordsA A', being secured by a washer and nut below, ns shown, the former being preferable where flat iron is used for the' suspensionnods F, and the latter where round iron is used.- The lower ends of the braces E are seeured'to theA bolts-g in the chords A, their upper ends'being securedto the clamping pieces P. These'bolts g alto secure the ends of the horizontalvbraccs V, which prevent anyhorizontal vibration of the bridge. The hrnces X are secured to the suspension-rods F, as shown, and to the end of the chord C by the iron ,'which is riveted to' the chord, and which has an eye at its end, throughwhich passes the brace X, which is secured by a not, as shown. The

covering piece H is secured to the arch by means of the securing pieces J, and also by riveting, as shown in gs.,2 and 3, one or both modes of fastening being'used as desired. These securing pieces J, shown in fig. 7,

' have the sides d dmede to fit the VHeiliges of the (loizbl'efl'r ,iron formingfthe arclnnnd have the bolt e, which passes through the covering piece H, and is secured bythe nut'K on thc` top. In rvthis manner I` construct n girder of great'strength and stability, which is well protected from ravin and moisture, and has little or no lateral' vibration, with a. small vamount of iron. l

I do not claim as my invention the use of the-shoes R, the chords AA, the suspensionrods F,the string pieces C C, the braces E, V, and X, nor the iron as these have been before used-and patented; but.Y what I do claim as my invention, und desire to secure by Letters Potent, issl 1. The arch B, composed of' the two double-T irons b b, combined and arranged with clamping and securing pieces, and covering pieces, 1n the manner and forthe purpose hereinspecifiedl 2. The clamping piece D, constructed and arranged as hereinbefore specified.

3. The clamping piece P, constructed and arranged ns hereinbefore specified. 4. The securing piece J, constructed and arranged-cs hereinbeforc specified. v v

' A DAVID HAMMOND. Witnesses:

E. N. BEEnoUT, D. J. MYERS.

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