Eyebar

A rod eye (English eyebar ) is a metal rod whose most widened flat ends each containing an eye, which is a circular opening for receiving the bolt, establishes the connection to the next rod or eyes for securing it to another component.

Eye rods were used in particular for chain bridges as chain links. Later they formed an important part of North American timber-framed structures, where the claimed alone on train, but never at the rods and pull straps were made from eyes rods. Today eye rods are still used in the rare chain bridges. In mechanical engineering today rod eye - bolt connections are used when the connection is to be rotatable or frequent and easy to solve. For this purpose, the effects of the predictors eyes rod form, rated voltage, pin play, coefficient of friction and head cavity enlargement on the structural behavior of the eyes rod bolt connections must weren investigated computationally.

The eyes rod is usually made ​​of flat steel, formerly of flat iron. If several eye rods utilized in parallel or in a component in the same function, they must have the same length and the same modulus of elasticity, so that they are loaded in the same way.

The first few bars were iron rods whose ends were bent up to eyelets. Not only because of that time still very different material properties of the iron was their tension can not be predicted in a satisfactory manner. William Hawks and Samuel Brown developed 1805-1818 improved eyes with perforated rods and forged eyes. Soon eye bars of flat iron and later steel with a uniform rectangular cross section have been developed, their eyes were either forged or formed by upsetting in hydraulic presses. In the U.S., this was done on an industrial scale. During construction of the Elizabeth bridge in Budapest in 1900 you were not or no longer set up in Europe to this method of production. Therefore, the chain links were cut in one piece of wide mild steel, with a large proportion of waste and high production costs incurred. Similar procedure was followed later in the construction of the Deutz Suspension Bridge.