Patent ID: 8033872

Claim:
A contact terminal assembled in a test socket for connecting an integrated circuit (IC) and a printed circuit board (PCB) comprising: a lower contact pin configured from a sheet metal and including a main body with a pair of elastic arms extending upwardly and offset from a central plane of the main body so as to define a receiving space therebetween; an upper contact pin configured to electrically couple with the lower contact pin and electrically received within the receiving space defined between the elastic arms contacting with the upper contact pin; and a spring device surrounding both the lower and upper contact pins and biasing the upper and lower contact pins from each other; wherein the upper contact pin includes a plate-like main portion received in the receiving space of the lower contact pin, and two pair of stopping portions respectively projecting from two sides of the main portion, and two guiding slots each formed between two stopping portions located at a same side of the main portion, and wherein the elastic arms received in the corresponding guiding slots include a pair of clamping portions located at free end thereof and clamping the main portion of the upper contact pin; wherein the clamping portions each has a width bigger than that of the corresponding elastic arm so as to define two hooks formed at jointing portions of the elastic arms and the corresponding clamping portions, and wherein the hooks abut against the stopping portions of the upper contact pin to prevent the upper and lower contact pins from separating from each other; wherein the upper contact pin has a first contacting portion for connecting with the IC, wherein the main portion has a thickness smaller than that of the first contacting portion, and wherein a step is formed at a jointing portion of the first contacting portion and the main portion.