| 摘要 |
PURPOSE:To improve efficiency for the use of a permanent magnet and to provide a small-sized hooking device, by a method wherein strong magnetic plates for which a magnetic close circuit is to be set on both sides of a permanent magnet are centralized at the projected portion of the strong magnetism. CONSTITUTION:A strong magnetic plate 2 is fastened on one end surface of a permanent magnet 1, and the plate 2 is holded by folded elements 3a-3a of a cover 3. The cover 3 made of non-magnetic material has a hole 3b on its upper surface and the end portion of the hole 3b is folded in the inner lower direction to contact with the inner peripheral surface of the hole 1a of the magnet 1. The end portion also made projections 3a-3a along the lower hole edge. With this method, the magnetic flux can be centralized without fail, enabling efficient use of the permanent magnet and the hooker to be made smaller. |
