Spring contact for arc discharge tube base

Claim 1

An arc discharge tube having a metal end cap at its end electrically connected to a discharge electrode in the arc tube, the end cap having a bowed spring contact fastened thereto, the spring contact being the support means and the electrical connection means for the arc tube when it is inserted into a socket, the end cap comprising a larger diameter shoulder and a smaller diameter terminal portion, said shoulder fitting over the end of the arc tube and being cemented thereto, the spring contact being fastened to the end of said terminal portion, said spring contact comprising arms extending from a center portion, the center portion being fastened to the end of said terminal portion, said arms forming a basket around the end cap and extending to the shoulder thereof but being spaced therefrom, the largest diameter of said basket being about midway between the shoulder and the terminal portion end, wherein said arms can be pressed into contact with said shoulder, and can be compressed further, when the end cap is inserted into a suitable socket.