| 主权项 |
1. A holding device for holding a cylindrical body, comprising:
a holding frame having a C-shaped section for holding an outer circumferential surface of the cylindrical body; a clamp arm attached swingably at one end portion of the holding frame; and a first lock device for holding the holding frame and the clamp arm at a position where the clamp arm and the holding frame overlap with each other, the first lock device including a first recess formed in one of the holding frame and the clamp arm, a first magnet accommodated in the first recess, a second recess formed in the other of the holding frame and the clamp arm, a second magnet accommodated in the second recess and a magnetic member disposed at a bottom of the first recess to magnetically attract the first magnet, the first and second magnets being magnetically attached to and released from each other in accordance with swing of the clamp arm and being disposed such that the first magnet moves to a side of the second magnet to be magnetically attached to the second magnet at the position where the clamp arm and the holding frame overlap with each other, wherein the first and second magnets respectively have different pole surfaces opposed to each other, and at least the first magnet has an outer diameter smaller than an inner diameter of the first recess, and the holding frame includes a first connecting shaft arranged at the one end portion thereof, and two frame bodies spaced apart from each other; the clamp arm includes two arm bodies spaced apart from each other; and the first connecting shaft connects the frame bodies penetrating through middle portions of the arm bodies such that the arm bodies of the clamp arm are disposed between the frame bodies of the holding frame. |
