Patent ID: 7775485

Claim:
A display support arm comprising: a first swing arm having a first end portion positioned vertically on top of a housing and further having a second end portion, the first swing arm causing the second end portion to rotate in a horizontal plane with the first end portion as a rotational center; a second swing arm having a third end portion joined vertically to the second end portion and further having a fourth end portion, the second swing arm causing the fourth end portion to rotate in a horizontal plane with the third end portion as a rotational center; a display joined vertically to the fourth end portion; a first lock device for locking a rotational motion of the first swing arm automatically when the housing and the first swing arm reach a predetermined relative position; a second lock device for locking a relative rotational motion of the first and second swing arms automatically when the first and second swing arms vertically reach a position where the first swing arm and the second swing arm overlap each other; and a lock setting device for switching the first and second lock devices in one behavior to a lockable state able to effect locking automatically in the predetermined relative position and the overlapping position or an unlockable state failing to perform the locking in the predetermined relative position and the overlapping position.