USRE3292E - Improved iron bridge - Google Patents

Description

UNITED STATES PATENT OEEIGE..

DAVID HAMMOND AND W. R. REEVES, OF CANTON, OHIO.

HVIPRCNED IRON BRIDGE.`

Specification forming part of Letters Patent No. 43,202, dated June v2l, 1864 Reissue No. 2,701, dated July 30,

- 1867 3 Reissue No. 3,292, dated February 9,1869.

To all 'whom it may concern: A

Be it known that we, DAVID HAMMOND and W. R. REEVES, both of Canton, in the county of Stark and State oi' Ohio, have invented new and useful Improvements in Wrought-Iron Girders for Bridges or other structures 5 and we do hereby declare that the following is a full, clear, and exact description of our invention, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon, of which drawings- Figure 1 is a side view of our girder applied to a bridge.

the arch and suspension-rods or diagonal braces.

Our invention further consists in the combination of an arch composed of two or more arch-pieces and a coveringpiece, united by clamping-pieces and bolts, as is hereinafter more fully shown, with a chord or chords, suspension -rods, diagonal braces, and shoes, whereby we obtain a girder of great strength and rigidity with a moderate amount of material and cost of construction.

To enable others skilled in the art to make and use our invention, we will proceed to de scribe its construction and operation.

The arch A is composed of three strips of plate-iron, a a b, two plates, a a, being placed parallel to each other and invertical positions, while the third plate, b, is laid on the top ot' these two plates in a horizontal position, and

forms the covering-piece of the arch. The pieces are combined by means of the cla1nping pieces o c (shown in detail in Fig. 4,) and the bolt d, which passes through the clamping piece o, between the side plates a a oi' the arch, and through the covering -piecc I), and is sccured by the nut o, as shown. The stringpiece D is a long piece ot' platedron set up edgewise, and forms the chord to the arch A. The ends of this string-piece D are placed between the ends of the arch pieces a a, and they are set in shoes E, as shown. The shoes and en ds ci' the string-piece and arch pieces are firmly connected by bolts l, which pass through the sides of the shoe and the ends of the several pieces.

The suspension-rods B B are formed of rect angular or square iron, as shown, andy are connected to the arch A by the bolts m m, which pass through the side pieces a, a and a hole in the suspension-rod B, and also by a bolt, m, which is formed on the end of the suspension-rod B, as shown in Figs. 1 and 3, and which passes through the covering-piece b, and is secured by a nut, f, on the top of said plate.

lt is readily seen that this method of connecting the suspension -rods and arch serves as an additional feature in combining the three plates a a b which form the arch A, and strengthens said arch against horizontal vibrations. The diagonal braces O O are eombined with the arch A by bolts n, and bolt w, and nut h, in a manner precisely similar to that just described for combining the suspension-rods and arch. The suspension-rods B B and diagonal braces C O are connected to the string-piece D by means of the stirrups r r, formed on their lower ends, which support the chord D, as shown in Figs. l and 3, and are secured in the proper positions by bolts k and z', which pass through the two sides of the stirrups r r and the chord D, as shown. These bolts 7c and i may be simply bolts of ordinary form and proper length, or they may be formed bythe ends of the horizontal braces p p, which are used to prevent a lateral vibration of the bridge, and which have a thread cut on their ends, and are provided with jam-nuts s and j, and pass through the stirrups r r and chord D, as shown in Fig. 3. The stringers F F are notched down onto the chords D I), between the suspension-rods B B and diagonal braces C C, as shown in Figs. 1, 2, and 3, and have the .Hoor strin gers G G arranged on them, as

shown. The tloorin g K is laid on these iloorstringers F F, as shown in Fig. 1.

IIaving thus fully described our girder, we do not claim as our invention the combina tion ofthe arch -pieces a n, covering -piece b,

clamping-piece c, and bolt d with nut e, or the shoes E, chords D, suspension-rods B, braces C or p, or Hoor -beams G and F, as all these features have been before shown; but

What We do claim as our invention, and desire to secure by Letters Patent, is-

l. The peculiar arrangement and combination of the arohpieees a a, covering-piece b,

bolt m, suspension-rod B, or diagonal brace G with bolt w or w and nuts f or h, the several parts being constructed and arranged substantially in the manner and for the purpose herein specified,

2. rlhe combination of the arch A, composed of arch-pieces a a, covering-piece. b, clampingpieces c c, and bolts d d with nuts e, the chord D, suspension-rods B B, braces C C, and shoes E E, the Whole forming a bow string girder, substantially as and for the purpose specified.

As evidence that we claim the foregoing We have hereunto set our hands this 3d day of March, 1868.

DAVID HAMMOND.

W. E. REEVES.

Witnesses:

JoB ABBOTT, ED. N. BEEBOUT.

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