US Patent 10290975 Movable connector

To reduce the displacement load of a spring portion in order to improve the workability of insertion and extraction of a movable connector. A spring portion has an upper piece portion and a lower piece portion having a linear shape, and is formed in such a square wave shape that an outer vertical piece portion having a linear portion extends from a first end of the upper piece portion, a central vertical piece portion having a linear shape and connected to a first end of the lower piece portion extends from a second end of the upper piece portion, and an inner vertical piece portion having a linear shape extends from a second end of the lower piece portion.