Patent ID: 7614591

Claim:
A foldable base, applied to a display and connected to a supporting arm of the display, the foldable base comprising: a first portion; a second portion, able to be assembled with the first portion, and the first portion pivotably connected to the second portion; and a rotation device, comprising: a shaft having a main body, two ends of the shaft connected to the first portion, the shaft rotated when the first portion of the base being rotated, the main body positioned within a turning space of the base, and the main body having a positioning plane and a curved surface respectively corresponding to a bottom surface and a top surface of the turning space, wherein when the first portion of the base is positioned at a first position, the positioning plane of the main body is perpendicular to the bottom surface and the top surface; wherein when the first portion of the base is positioned at a second position, the positioning plane presses against the bottom surface; wherein when the first portion of the base is positioned between the first position and the second position, the bottom surface applies a stress to a contact point between the positioning plane and the bottom surface, so that the main body can be rotated with the curved surface towards a direction for receiving the first portion.