US111662A - Improvement in truss-bridges - Google Patents

Description

iti-teh' Siete? @eine effin JOHN A. MCKAYQOI? AUBURN, INDIAN-A.

Letters Patent No. 111,662, dated February 7, 1871.

IMPROVEMENT IN 'l'RUSS-BRDGES.

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

` exact description of the same, reference being had to the accompanying drawing making a part of this specification, in ivhicl1` Figure 1v is .a top view;

Figure 2, a side elevation, with a small space att-he vfoot of a brace in section; Y

'Figure 3,21. vertical crosssection through line x.

, Figure 4, a perspective view of one. of the sockets.-

' concussion; and .Y It is accomplished by the use of arnet-allie socket or cap ofpcculiarconstruction which rests on the upper chords and` holds the end of the cross counterbraces.' v

In the drawing- A A are the upper chords, connected. by horizontal counter-braces, B AB, and by the terminal braces B the counter-braces beingr bolted together at b '11.

Q C are the lower chords, connected each to the upper one above it by meansof the vertical double braces ll E' and single braces lf lf".

The lower chords are also connected andulaterally braced by the titan-timbers G Gr, which are provided with shoulders that iit against the chords, holding them apart, as shown in iig. 3, and with gains that iit around the edges of the side-braces, as shown in Iig. 2, preventing lateral movementeither otward or inward. y'

Such being the general construction of thetruss.

my improvement consists lin the employment of a in etallic cap, M, shown in figs. 1,4, and -5, which is at.- tached to the upper side oi the top chords -bymeaus of pins, r1', projecting down into holes made in the chords, and serves as a socket to confine and hold the l ends ofthe cross-braces. n

The braces cross each otherrat the center of the socket, and are bolted down through it, asv shown at c e.

.Lhe socket is a plate of metal cast with crossed beds or grooves in its upper side to accommodate the crossed braces, the grooves terminating at their-.outer end at a wall or flange, c e, against which the ends ot' the timbers abut, and being, of course, open at their inner end.

Between theoutverends oi' the timbers the space may be filled'by a re-cntrant angle of the ange, as at a, in iig. 5, or by a solid projection, as at c, in fig. 4,

Yand a similar angle or projection, i t, maybe cast or formed between the inner ends ot' the grooves to brace the timbers firmly oil that side.

lo'completc the bridge to which my improvement is shown applied, I employ braces E with gains fm m into which the chord-timbers fit.

' Bolts o connect the parts.

Cross-braces 11 are constructed and arranged substantially in the same manner.

lihe braces E and F are provided with tenons fitting in mortises in the chords, and abutting with their shoulders against the surface ofthe chords.

lI.hey are bolted as shown at o o' and r r'.

l'laving thus described my invention, lVhat l claim as new, andl desire to secure by Letters latcnt, is- The caps M M, when constructed and applied substantially'as and ior'the purposes set forth.

'lhe above specification oi' my invention signed by me this 14th day oi' September, A. 1).1870.

' J. A.l MLKAY. Witnesses DAVID 1I. Uonnlncn,

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