US150327A

US150327A - Improvement in bridges

Info

Publication number: US150327A
Authority: US
Publication date: 1874-04-28
Anticipated expiration: 1891-04-28

Description

F. E. JDSEL.

Bridges.

N0,\50,327 Patented Apr|28,1874.

UNITED STATES PATENT OFFICE.

FRANCIs E. JosEL, oF FREEFCRT, ILLINOIS.

IMPROVEMENT IN BRIDGES.

Specification forming part of Letters Patent N0. 150,327, dated April 28, 1874; application tiled February 7, 1874.

To all whom it may concern:

. cation The nature of my invention relates to improvements in that class of bridges known as lattice-bridges; and the invention consists in the peculiar arrangement and disposition of the braces occupying the spandrels or spaces between the upper and straight chord, and the lower and arched chord; in the construction of the arch-chords; and in the general arrangement and combination of the different parts, all as hereinafter fully described.

In the accompanying drawings, Figure 1 represents a side elevation of a bridge embodying my invention, and Figs. 2 and 3 perspective views 0f detached portions thereof.

Refering to the parts by letters, letter A represents the upper chord of the bridge, which is straight, as shown in the drawings. B is the lower chord, which is lcambered or arched, either as a semicircle, ellipsis, segv mental, or any other ordinary style of arch,

but is shown in the drawings as segmental, and formed of a series of short straight beams, b, arranged end to end. C is an iron band extending along the under side of the beams b, to which it is bolted securely by bolts c c. D D are vertical beams or posts, framed securely at their lower ends to the ends of the chord B, and at their upper ends to the chord A. Letters E represent the main braces, connecting the upper and lower chords A and B, They are arranged radially to the arch-cord B, their upper ends framed securely, as shown in the drawings, to the upper chord A, and their lower ends provided with pins e, which rest in recesses c, framed at the adjacent ends of each and every beam b b. G G are iron rods arranged parallel with the braces E, one to each beam b-their upper ends passing through the chord A, and their lower ends through the chord B-consisting of the beams b and the iron band C, and provided with nuts g g at their upper and lower ends. Letters H represent the counter-braces, arranged tangentially to the curve of the arch-chord B, and within the spandrels between said archa chord and the chordA and posts D D, their upper ends framed securely to the chord A, and their lower ends to the postsD D, and the braces E may be let into them slightly at their crossing-points and bolted to them at said points by bolts h. I I are the abutments, built of stone or any other suitable material, and having projections J J, on which the ends ofthe posts D and the ends of the arch-chords B rest, and with irm vertical ends, against which the sides of the postsD rest, and which receive the thrust from the braces. As shown by the full lines at Fig. l, the roadway is construct ed on the arch-chords A, which are about on a level with the tops of the abutments;-but in case it is desired to have an elevated covered bridge the lower ends ofthe posts D D and the ends of the arch-chords B B may rest on the top of the abutments, and stringers K K, for the roadway, be held in place by suspension-rods L from the chords A, as plainly shown by dotted lines at Fig. l.

The bottom framing for the floors may be a framed iny any of the ordinary styles.

The dimensions of all parts are proportioned to the strains they are to receive.

The bridge may be built of wood or iron. If built of wood the joints between the beams b b should be packed with rubber or some suitable water-tight material, and which would relieve .the concussion from their coming together, whether of wood or iron.

The advantages of this system of bracing are deemed evident to any one skilled in the art, without special description.

I claim- A bridge having the straight chord A, braces E, counter-braces H, rods G, and arched chord B, constructed substantially as and for the purpose specified.

FRANCIS E. JOSEL.

Witnesses:

0. TAYLOR, f STERNE F. AsrINwALL.