US91745A - Improved bridge - Google Patents

Description

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JOSEPH G. HENSZEY, OF PHILADELPHIA,PENNSYLVANIA.

Letters Patent No. 91,745, dated .Ttme 22, 1869.

IMPROVED BRIDGE.

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

To all whonm't may concer-n:

Be it known that I, J osnPn G. HnNsznY, of Philadelphia, Pennsylvania, have invented certain Improvements inv Bridges; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention consists- First, of'certain bars of rolled iron, arranged and secured together substantially in the manner described hereafter, so as to form a light and simple, but rigid upper chord for a bridge.

Second, in combining with the said .upper chord certain suspension-rods and longitudinal bars, formin the lower chord, as fully explained hereafter.

In order to enable others Skilled in the art to make and use my invention, I will now proceed to describe its construction and operation, reference being had to the accompanying drawing, which forms a part of this specification, and in which- Figure 1 represents atransversc section of a portion of my improved bridge; v

Figure 2, a longitudinal section on the line 1 2, iig. 1.

Figure 3, a transverse section illustrating a modication ofiny invention; and

Figure l4, another modification.

A is the upper arched chord of the bridge; and

B, ihe straight lower chord ofthe same. l

The upper chord, asshown in figs. 1, 2, and 3, consists of continuous bars a and a', and al, and transverse rods, e, all of wrought-iron.

The bars a and-lt' are rolled to the segmental form shown in tig. 1, or they may be straight, as shown in 3, but in either case' they are provided on both edges with lihnges b. The bar (l is secured at the upper edge, between the upper flanges ot' the bars al and a', by bolts or rivets, as shown in the drawing, and the said bars a and a', are connected together at their lower edges by transverse rods e, which are arranged at intervals, and pass through slots in the bar d.

D D are the suspension-rods, each of which consists of a flat bar,the upper edgeof which is in contact, or nearly so, with the lower edge of the bar d, and is connected to the latter by splicing-stripsff, and bolts or rivets, as shown in iig. 1, the lower end of the suspen- V sion-rod passing between the longitudinal bars E E,

of the lower chord, to which it is also secured by bolts or rivets. y

The bars c, e', and d, arranged and secured together in the manner described, constitute of tbemselves a light, but rigid and substantial guide, from which to suspend theroadway ot' the bridge, the suspension-rods and the longitudinal rods of the lower chord, on which rest the transverse beams of the road* way, being also of the simplest character, while every facility is aiorded for securing the whole together by ordinary bolts or rivets.

In bridges of the lighter class, the bar tl may be dispensed with, and the suspension-rods may pass upwards between the bars a and e', and may be secured to the same by bolts or rivets, as shown in fig. 4f

Without confining myself to any specific form ofthe rolled bars a. and al,

I claim as my invention, and desirel to secure by Letters Patent- 1. The upper chord, consisting of the flanged bars a and a', with or Without the 'bar d, and transverse rods, e, arranged and secured together, substantially in the manner and for the purpose described.

2. In combination with the above, the suspensionrods D, and longitudinal bars E E ofthe lower chord.

In testimony whereof, I have signed my name to this specification, in the presence ci' two subscribing witnesses.

JOSEPH G. HENSZEY.

Witnesses:

J oHN WHITE, HARRY SMITH.

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