| 摘要 |
PURPOSE:To facilitate assembling work by magnetizing a switching member before an operating knob for rotating the switching member made of permanent magnetic material is engaged with the switching member. CONSTITUTION:The lower end surface of a magnetic member 24 of a magnetic circuit block 22 acts as a magnetic acting surface 28. A switching member 32 made of permanent magnet is arranged in a bore 30 so as to be able to rotate. In the state where a recessed part 32b is positioned so as to stretch in the direction perpendicular to the magnetic acting surface 28, the switching member 32 is weakly magnetized, and acts as a weak permanent magnet in the diameter direction. A pinching member 76 is coupled with the bore 30 via a base member 36. According to this constitution, when the block 22 does not reach magnetic equibrium, the magnetized switching member 32 is rotated toward non-magnetized position where the block 22 turns to a magnetic equibrium state, so that the rotating position with respect to the block 22 becomes always constant. Hence the relative position relations and the like between the switching member 32, the base member 36, a plate 58, the block 22 and the pinching member 76 are not necessary to be corrected, and the assembling work is facilitated. |
