USRE2701E - Improvement in bridges - Google Patents

Description

@Hitch gta-trs attnt @frn IMPROVEMENT I N BRIDGES.

@the dgnml nf-ara in in that @aan atfut mit making tart nt tlg 5min.

TO ALL WHOM IT MAY CNERN: l

Be it known that We, DAVID HAMMOND and W. R. REuVEs,.both of Canton, in the county ot' Stark',- and State of Ohio, have invented new'and useful Improvements in Vroughtlron Girders for Bridges or other structures; and we do hereby declare that the vfollowing is a full, clear, 'and exact description of our inven' tion, reference being had tothe accompanying drawings, forming a part of this specification, and to the letters ofreferenc-e marked thereon, of vwhich, drawings- Figure 1 is a side view of our girder Aapplied to a bridge.

Figure 2 is a plan of the same.

Figure 3 is a cross-section of one of the gil-ders, showing the arrangement of the same.

Figures 4 and 5 are viewsshowi'ng the arrangementf'ot' clamping piece.

The nature of our-invention is the novel construction of an arch andlnovel combination of an arch and string pieces, suspension rods, and diagonal brac-cs, 'whereby we obtaina. girder of great'stren'gth and sti'ness `with comparatively little weight.

To enable others skilled in the art to make and usevour invention, we` will proceed to describe its construction and operation.-

The arch A of each girder is composed of two vertically continuous irons, a d, placed parallel to each' other, having the coveringpiece b arranged on the top, as shown in iig. 3. lfheiirons-a a may be.ccnstructed of common plate iron or of 'channel iron, as shown, the channel iron being preferable.. The top piece b is secured to the pieces a a, either by means of the clamping pieces-c and bolts d, with nuts e thereon, or by riveting through `the top pieces and flanges of the channel iron, the former being the mode for -securing when the pieces a a are `made of plate iron, and the latter, or both modes combined, when the pieces a a are of channel iron.

The clamping pieces c are notched n so as to receive and tit the loweredge of thc pieces a a, and' have the-bolts d passing through them and through the top piece being secured by nuts e, as fully shown in figs.. 4 and 5. The string pieces D D are two continuous pieces of plate iron set up edgewise, and form a chord to the arch A. The chords D D are arranged in the shoes E, as'shown in fig. 2, and thek pieces a a have their lbearing in the said shoes, and between the string pieces D D are placed the iron blocks X. n The boltsZ pass through the-lips of the shoes E, the lower endsot` the arch'peces a a, the string pieces D D, and the blocks X, thus iirmly connecting thetwo ends of the arch to each other. The suspension rods B pass through the clampingpieces n, betweenthe pieces a a of the arch A, and throughl the top piece b of the archl` A,being secured by the nuts f, asshown in tig. 3. At their lorfercnds they pass between the string pieces-DD, and are cut at their sides so as to receive the pieces D D, to'which they are secured by bolts 7c k. The braces C are securedl'tc the string pieces D D by the boltszjj, thebraces being placed between the chords, and llavingan eye at their lower ends, sindicated in figs. 1 and 2, and the bolts z'hq'jpassing through the eye in the'braces, as before shown. These braces pass through the top piece b and are secured by nuts,as shown in g. 1. The st ringers F are laid on the chord D D, as shown, and have the pieces G G arrangedon them, on which is placed the flooring of the bridge. To the middle stringer is attached the brace H, by means of the bolt I, the other end of said brace having an eye, through which passes the suspension rod B, andwhich is bolted between thepieces am and the clamping piece 1t, as fully shown in iig. 3. 'lhe horizontal braces, which prevent. any lateral vibration of the bridge, are secured to the chords by the bolts jj and to the shoe E, as shown, and unite in the rings J, :1nd,by means oi' the nuts on their ends and inside of the ring J, can be drawn as tight as desired. The suspension rodsB have the nuts o, whicharebelow the clamping pieces c c or n, and which serve to bind the clamping closely to the piecesaaof the arch.

Hav-ing thus fully`described our girl-ier,l what we claim as ourV invention, and desire to secure lby Letters Patent,.is-

1. 'lhe archV A, constructed of theside pieces-a a, top piece b, clamping pieces e c and n n, bolts d d, nuts e e, the whole combined substantially' as herein specified.

2. The combination of the arch A, constructed as hereinbefore speciiiethithe string pieces D D, suspension rods B B, diagonal braces C C, and shoes E E, substantially as herein set forth.

As evidence we claim the foregoing, we have hereunto set our hands inpresence of two witnesses.

I v DAVID HAMMOND,

W. It. REEVES.

Witnesses:

Cuts. F. MANDERsoN, ,E. N. BnEBoUr.

Images