| 摘要 |
PURPOSE:To prevent a magnet plate from being mounted inside out, by providing one of two regions of the magnet plate with a part spatially asymmetric to the other region and by providing a projection on a part of a movable base which faces the asymmetric part. CONSTITUTION:A projection 43 is provided on one region 41 of a magnet plate 4 asymmetrically to another region. If the magnet plate 4 is set inside out on a movable base 3 by mistake in assembly work, the top of a connector 16 runs into the projection 43 of the magnet plate 4 and the plane contact between the base 3 and the plate 4 is hindered. Therefore, the wrong setting is immediately noticed. |
