| 摘要 |
PURPOSE:To attract alternately the magnets in both ends in accordance with power feeding direction by boring a through hole at the center of iron core having a winding at the circumference, attaching magnets in both ends by inserting a shift longer than the iron core and by providing the members for locking magnets and restoring them. CONSTITUTION:A coil 2 is wound around the hollow iron core 1 having the flange which becomes the bobbin and a shaft 5 which is a little longer than the iron core 1 is inserted into the hollow part of iron core 1. A front magnet plate 3 is attached to the one end of shaft 5, a rear magnet plate 4 is attached to the other end thereof, and the cutaway part 12 is provided in the periphery of flange opposing to the magnet 3 so that the lock restoring magnet 7 can move therethrough. Moreover, a lock metal 6 of which one end is fixed by adequate means is fixed to the magnet 3, while the restoring magnet 7 is attached to the bending part. With such structure, the polarity of battery 8 which is connected to the winding 2 is changed and the lock member 6 and restoring member 7 are operated, causing the magnets 3 and 4 to be attracted alternately to the iron core 1. |
