Patent ID: 7635277

Claim:
A socket for an electrical part mounted on a wiring board, comprising: a plurality of contact pins, each of the contact pins having a base portion, an elastic piece extending upward from the base portions and electrically contacted to a terminal of the electrical part by pinching the terminal with contact portions being formed on a top of the elastic piece, a lead portion extending downward from the base portion and inserted to an insertion hole of the wiring board; a socket body having through holes into which the contact pins are inserted from an under side of the socket body, wherein the through holes have fitting hole portions to which the base portions are fitted so as to prevent an upward movement of the contact pins; and a locating board being placed vertically movable, on a lower side of the socket body, and being formed with a plurality if insertion holes corresponding respectively to the plurality of contact pins with each contact pin being inserted into the corresponding insertion hole, and when the locating board is separated from a lower surface of the socket body, the lead portion of each contact pin is positioned to a position corresponding to the corresponding insertion hole of the wiring board, and when the locating board approaches most closely the lower surface of the socket body, the locating board contacts a lower surface of the base portion of each of the contact pins, and the lower surface of the socket body, so as to restrict a downward movement of each of the contact pins, wherein each of the contact pins are provided with an intermediate portion in a shape of a plate between the base portion and the lead portion, the intermediate portion having a width smaller than that of the base portion and larger than that of the lead portion, and each insertion hole is formed with an intermediate insertion portion into which the intermediate portion of the corresponding contact pin is inserted and a lead insertion portion into which the lead portion of the corresponding contact pin is inserted, the intermediate insertion portion having a width larger than that of the lead insertion portion.