Spring contact

A spring contact integrally formed by blanking and bending a metal plate member, the spring contact comprising:

• an upper head portion having an upper tip protruding upward;
• an upper connection portion connected to the upper head portion and extending downward from the upper head portion;
• a spring portion connected to the upper connection portion and extending downward from the upper connection portion, the spring portion having a zigzag pattern that includes straight portions having a straight-line shape and bent joints at which two straight portions are connected with each other with an acute angle;
• a lower connection portion connected to the spring portion and extending from a lower end of the spring portion;
• a lower head portion directly connected to the lower connection portion and extending downward from the lower connection portion;
• a lower tip disposed at a lower end of the lower head portion;
• and
• a core having a linear strip shape, wherein a first end of the core is directly connected to a lowest bent joint of the bent joints that is placed closest to the lower end of the spring portion, and the core extends from the lowest bent joint at least to a lowest end of the upper head portion so that a second end of the core is capable of contacting the upper head portion, and
• wherein a centerline of the upper head portion and a centerline of the lower head portion are on a same imaginary straight line,
• the spring portion has a pitch and a width that are constant, respectively, and
• the spring portion is formed to be biased with respect to the imaginary straight line such that all of the joint bents disposed in a first side of the zigzag pattern are placed closer to the imaginary straight line than the joint bents disposed in a second side of the zigzag pattern.