US38910A - Improvement in iron bridges - Google Patents

Description

UNITED STATES PATENT OIFFICEO SIMEON S. POST, OF JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN IRON BRIDGES.

Specification forming part of Letters Patent No. 38,9l0, dated June 1G, 1863.

To all whom t may concern Beit known that I, S. S. PosT, of Jersey City, county of Hudson, State of New Jersey, have invented a new and Improved Method ot' Constructing-Iron Bridges; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and the letters of reference marked thereon.

The nature of my invention consists in constructing an iron bridge in such a manner as that the expansion and contraction ot' thc material will not produce injurious effects upon the structure, and in this' manner obviating one ofthe most serious objections to the universal use ot' such bridges.

To enable others skilled in the art to malie and use my invention, I will proceed to de-l scribe its construction more minutely.

Figure l shows a side elevation of two panels ot' one end of a truss or girder. Fig. 2

shows a plan ot'the chord and its attachments.

v Fig. 3 shows an end View of a post with the Fig.

attachment of the chord and top plate. 4t shows a side view of a post. Fig. 5 shows a plan of the upper plate or chord used by me.

I fasten the pedestal A bymeans of suitable bolts to the masonry or proper abutment, which pedestal is made to receive the end post of the bridge, which post is rounded at the bottom, as shown at B, and held in the pedestal (which has a lip, d) bythe bolt g, passing through` both, the pedestal and the slot-e in the chord F, to which chord I attach the brace g', which is fastened with the strut or post H to the top chord or plate, J, by means of a bolt, k, passing through thcjoint box L, as shown in Fig. 5, k. The joint-box is used for the purpose ot connecting the sections of the top chord or plate in such a manner that by passing the bolt k through the struts and braces will allow both to revolve upon said bolt to an extent corresponding to the degree of the expansion or contraction. The jointbox may be placed upon the struts, and the braces g and hf maybe introduced, as shown in Fig. 3, at R, and the bolt 7c passed through,

as shown in Fig. l at P, after which the sections of the plate or upper chord may be at tached to the boX by-bolts m m.

IIa-vi ng thus described my invention, what I claim, and for which I desire to secure Letters Patent, is-

l. The jointbox connecting segments of the top chord or plate, and also receivingthe heads ot' the posts or struts and braces, with the loose pin 7c passing through the whole.

' 2. A cylindricaljoint in the construction of a bridge, as shown at B, irrespective ot'its location, when used for the purpose of obviating the dangers of expansion and contraction.

. 3. The slotted chord, when used in c0nnection with the cylindrical joint and for the same purposes.

4. The construction of the chord, when used in combination with the cylindiical joint, substantially as described and shown.

s. si. rosr.

Witnesses:

ANDREW J. PosT, 0. A. STEVENS.

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