US Patent 7165986 Socket for electrical parts

A socket for an electrical part includes a socket body to which an electrical part is accommodated, the socket body having a base portion to which a number of elastic contact pins are arranged, a movable member disposed to the socket body above the base portion to be vertically movable, contact portions, between which a terminal of the electric part is inserted, formed to the contact pins being opened or closed, and a preloading member adapted to elastically deform the elastic pieces in a direction of closing the contact portions of the contact pins.