US76558A - t r u e s d b l l - Google Patents

Description

@niet mit -atwf @new Letters Patent Nin-76,558, dated April 7, 1868.

IMPROVEMENT 'IN BRIDGES.:

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TO ALL WHOM IT MAYOONGERN: l Be it known that I, Lf E. TRESDELL, oil Chicago, in tho.county of Cook, aud-State of Illinois, have invented a new Aand usefullmp'rovement in Iron Bridges and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of'refer'- ence marked thereon, making apart of this 'speciticatiomin which- .Figure 1 is side elevationA of my invention.

'Figure 2 is a vertical transverse section through the same.

Figure 3 is a vertical section through one of the posts on line e e, showing the manner of connecting its corresponding parts. I

Figure 4 is a transverse section of one of the postsY on lines w x, sii-owing the manner of cornecting the' bars which form the lower chord.A i

-Figure 5 is a detached sectionof a. portionv of fthe arch-cap on line showingthe manner of holding the outer ends of` the ties. i i

v Figure 6 is a vertical transverse section through the cap on line d d, `showingthe shapethereot.

Similar letters of reference, as theyoccur in the separate figures, denote like partsin both of the drawings. My inventionrelates to an improvement in Athat class of bridges which is' constructed of'iron; and the nature of my improvement'cousists, Y

First, in the shape of the caps and posts, as will be hereinafter more fully explained. Second, in the manner'of` connecting the several parts one to the other, whereby great 'strength and durability are obtained at a much less expense'than any oi' the heretofore-known arrangements.

To enable others skilled in the art to more fully understand and construct my invention, I will proceed to describe the same lwith reference to the drawings. i

`A and A represent the caps or upper beam Iof the bridge. The latter is constructed in a circular form laterally, and provided with projections or iianges extending upward and` downward from the centre-whereby great strength is obtained. The former cap, A, is constructed in a like ruann'er, laterally,'and slightly curved, or arched longitudinally, and is hingedor jointed. at the lower end'to clamp-plates D D, that-'holdvthe outer v ends of the bars which form the lower chords C and C. Said caps extend obliquely upward, and pass into mortises cut in and -through the upper ends of posts B B,and are there connected to caps A by means of a look or dove-tail joint, as shown in the drawings byig. 3. Said posts extend downward to a. distance suiiieient to bring the lower` ends thereoi` in a horizontal line with the lower end oi' clamp-plates D D,.and are provided with slots cut therein,inthe direction ofthe length of the bridge,l for-the reception of chords C and C, the parts of said posts protruding downward. l. Each side of said slots' is iuted, or provided with a seres'of vertical corrugations, which correspond with and take into'a like series of corrugations in the end of the bars which form chords C and C, as the ends of the same areiapped or placed together within said slots, and are held therein bymeans of key z', passing through moi-tiefes cutin said post sat right angles with said slots, said key coming in contact with and against un adjustable slide, E, forcing the same upward againstsaid bars, thus firmly connecting the same the entire length oi' the bridge.

The lower side of caps A and A. is provided 'at the'joint thereof', and within the mortises in said posts, with a series of corrugations, cut therein transversely, which receives the ends of ties S and S. The ends thereof are slightly curved, and also corrugated, corresponding one with the other, and are held together and within the corrugations in said caps by means of slide E passing through the mcrtisc in said post under the' ties. i Suid slide is also corrugated, agreeing with the corrugations in said ties, and is capable of vertical adjustment by means oi` hey t' passing through al mortise lcutthrough said posts at right angles with and under said slide, thus forcing the same upward, which firmly connects the several parts one to the other.

Ties S'and S extend obiiquely downward, and are'connected to the lower end of the posts in a like manner as shown by fig. 3. That portion ofthe posts between the slotsvis also corrugated, which. receives thecorrugated part doi' the ties, and is held together by means ot'slide. E, which is also tinted, and forced upward by ke)7 2'. Thus the entire structure is iirmiy connected together; The ends ofthe outer tiesl S S are held vithin u, bevelled corrugated clmp-plate, H H, which i hield withina-corresponding mortis@` cnt through tho :entre of capV A,` as shown byifig. 5. i

Thesides of the bridge are connected laterally by means of sillsP passing across from post to post, as ihown by fig. 2. The Hoor F is supported by menne of joist T resting upon chords C amalfi/lf Posts B B nre constructed with four {langes,'a.s shown at L, fig. 3, and siightly tapered f'iourthe centre upward and downward, nearly to that portion of post through which the mortises are out, and are there'enlarged io gire the necessary strength,`

l ,The obj-ct of this style of pestis to give greater strength with less heft of iron,l :is the angcs :1ct as a..

)race one for the other.

Hoving thus described the lnature and object of my invention, what I claim as new, :md desire to secure )y Letters Patent, s

` l. The construction and arrangement of the corrugated clamp-plates H, in combination with the itie-rods S, in the manner and for'the purpose herein described. I

2. The construction `und arrangement ofi-the caps A and Af and posts B of a bridge s o that the suspension- 'ods may beV clampedA together b'y means of the corrugations upon the ends of the same, and held {rmlyviu posi- :ion by means of clamp E andwedge or'key z', substantiallyin the manner ,and for the purpose herein described. L. E. TRUESDELL.

Witnesseszf N. H. SHEnBUBNE, .JAMES COLEMAN.

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