The utility model provides a kind of flexible elastic piece, it is used in a track
socket adapter, the track
socket adapter includes base, and the active rotating piece, N pole conducting sheet and L pole conducting sheet being set on the base, rotating protrusion is equipped on the active rotating piece, three limit points are equipped on the flexible elastic piece, and the flexible elastic piece is divided into four sections;Among them, the flexible elastic piece is stored or unfolded state of N pole conducting sheet and L pole conducting sheet by its three limit points and the
abutment cooperation of rotating protrusion is realized.The flexible elastic piece realizes the
automatic control of the unfolded and storage state of conducting sheet in track socket, realizes the convenient cooperation with the rotating protrusion of active rotating piece, and the
automatic control of the unfolded and storage state of conducting sheet in track socket is realized by introducing the special-shaped snap spring structure with multiple limit points.