Patent ID: 8057270

Claim:
A contact device for a coaxial pair of axially elongated conductors which are movable in their axis direction to fit with each other, the contact device comprising: a pair of axially elongated conductors comprising a first conductor and second conductor; a fitting face in the first conductor for fitting with a fitting face of the second conductor when the first and second conductors are moved in their axis direction to fit with each other; an annular groove provided at the fitting face of one of said first and second conductors; a conductive piece arranged circumferentially around one of said first and second conductors, wherein the conductive piece is circumferentially divided into a plurality of segments, each of the segments of the conductive piece having a groove, wherein the grooves of said segments faces the annular groove of one of said first and second conductor; and a spirally wound annular conductive spring contact formed of bare wire tilted to have an elliptical cross section, wherein the spirally wound annular conductive spring contact is located in a space formed by the annular groove and the grooves of the plurality of conductive piece segments which face the annular groove, wherein the conductive piece segments form a line-contact or face-contact with the other of the first and second conductors when the first and second conductors are moved in their axis direction to fit with each other, thereby providing an electrical connection between the first and second conductors.