US328758A

US328758A - Truss-bridge

Info

Publication number: US328758A
Authority: US
Publication date: 1885-10-20
Anticipated expiration: 1902-10-20

Description

(mmel') c. & G. CARR.

TBUSS BRIDGE.

No. 328,758. Patented Oct. 20 1885. "I 1 I, 13. a (if V .Attorney! N. PETERS. Phoxo-Limu m nu. Washin ton, 0.6.

ilNrrnn STATES PATENT Orrrca.

CHARLES CARE AND GEORGE CARR, OF SUGAR TREE RIDGE, OHIO.

TRUSS-BRIDGE.

SPECIFICATION forming part of Letters Patent No. 328,758, dated October 20, 1885.

Application filed August 27, 1885. Serial No. 175,479. (No model.)

To all whom it may concern:

Be it known that we, CHARLES CARR and GEORGE CARR, citizens of the United States, residing at Sugar Tree Ridge, in the county of Highland and State of Ohio, have invented certain new and useful Improvements in Truss Bridges, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which- Figure 1 represents a perspective View of a truss-bridge embodying our improvements. Figs. 2 and 3 are details to be hereinafter referred to.

Our invention relates to truss-bridges; and the same consists in the improved construction and combination of devices, all of which will be hereinafter fully described, and specifically pointed out in the claims.

To enable others skilled in the art to make and use our improvements, we will describe its construction and the manner in which we have carried it out.

In the said drawings, A represents the main beams or sills, upon which the planks which constitute the floor are laid; or, if it be desired, these beams may be dispensed with and the tie-rod A used.

B represents the truss-beam, which is conneeted to the struts O and supported by the diagonal braces D, as shown. It will be observed the truss-beam B is made thicker or of increased diameter at its center. This construction we have found giving greater strength and security than if the beam was of uniform thickness. The lower ends of the braces D and struts O are adapted to fit sockets a, formed in the main beams or sills A, and they are securely held to these beams by the tie-bolts a and securing-nuts b, (see Fig. 3,) thereby dispensing with metallic shoes or similar devices.

Beneath the truss-beams and securely held thereto are placed supporting trussbeams E, the under surface of each being cut away at c to form sockets, in which the upper ends of the inclined braces or struts D fit and greatly assist in supporting the upper truss-beam.

Beneath the main beams or sills A are the beams F, which are placed transverse to the beams A, and are connected directly to the upper truss-beam in a manner we will now explain. The upper trussbeams are provided with metallic plates G, which are arranged transversely across their top portions, and these plates are perforated to receive the upper ends of the rods H H, which connect the plates with the beams F, while the nuts (I secure the parts together and regulate the tension of the rods. The rods H H are located upon each side of the upper trussbeam and the main sills, and therefore do not weaken these main features in all bridges by passing through them. They are also provided with a tap at 6, (see Fig. 3,) so that any one (or more) of the beams F may be disconnected and removed and a new beam inserted without deranging the other portions of the structure, and also without interfering with the travel 011 the same.

To keep the several parts of the bridge from becoming loose, we employ suitable brace-rods, J, connected directly to the transverse beams F and the upper truss-beams, and these bracerods have eyes 9 9, through which pass bolts h, which secure thelower end of the brace-rods to the beams F and the rods H or H, which secure the upper ends of said brace. When the several pieces which form thebridge have been placed in position, the sides of the structure are boarded up with strips, as illustrated in Fig. 2. The ends of the beams F, which project at some distance beyond the sides of the bridge, may be covered with sheet metal. This construction greatly adds to the durability of the structure, as it prevents the injurious effect of the weather upon the same, While the additional strength given the upper truss-beam by reason of its central portion being made heavier or of increased size, and the fact that the rods H H may be readily removed to repair the bridge without damaging the other portions, makes the bridge when completed much stronger, more durable, and cheaper than many of the structures now made.

A plate, 7, is introduced between the sill A and the transverse beams F, and is for the purpose of supporting that portion of the bridge when. its underlying beam F is removed to be replaced by a new one.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. The combination, with the main beams or sills, the struts O, and the transverse beams F, of the upper trussbeam, B, enlarged at its center, the struts or bracesD D, and suitable rods, porting-beams E, the plates G, through which H H, passing outside of and connecting the the rods pass, the bolts and nuts for securing upper truss-bean1s with the transverse beams, the parts, and the brace-rods J, connected to substantially as herein described. the beams F and plates G, substantially as 5 2. The combination, with the upper trussherein described.

beam enlarged at itscenter, the main sills, the beams F, placed under the sills, the end struts, O, and the braces D D, fitted in sockets in the W'itnesses: sills, of the rods H H, passing outside of and 10 connecting the beams 13 and F and the supoHARnEs CARR. GEQRGE CARR.

A. D. WIGGINS, ROBERT J. MAsTnRs.