Patent ID: 8783636

Claim:
A holding device for holding a cylindrical body, comprising: an arc-shaped holding frame disposed along an outer circumferential surface of the cylindrical body and having a first magnet; a clamp arm having a second magnet at a first end part thereof and a swing shaft at a substantial center thereof so that the clamp arm is swingably connected to at least one end of the holding frame through the swing shaft; and another clamp arm comprising a third magnet, wherein an opening through which the body to be held can be inserted into an inside of the holding frame is formed when the clamp arm is open, the holding frame and the clamp arm hold at least half a circumferential length of the outer circumferential surface of the cylindrical body when the clamp arm is closed, the first magnet and the second magnet are disposed where the first end part of the clamp arm and the holding frame overlap with each other when the clamp arm is closed, the holding frame further comprises a first frame body, a second frame body, a frame shaft connecting the first frame body and the second frame body, and a fourth magnet at a second end part of the holding frame, the third magnet and the fourth magnet are disposed where the second end part of the holding frame and the another clamp arm overlap with each other when the another clamp arm is closed, and the clamp arm further comprises a first arm body, a second arm body, and two arm shafts, the first arm body and the second arm body being connected with each other through the frame shaft and the arm shafts.