| 摘要 |
<p>PURPOSE:To maintain a sufficiently large door closing retention stably in a door closed condition without receiving an external energy, and to open the door manually when the door is opened. CONSTITUTION:The needle 4b of a linear motor and a sliding door 1A are engaged through the driving plate 21 of the needle 4b and the driven plate 22 of the sliding door 1A. The driving plate 21 and the driven plate 22 have a gap x in the driving direction. A door closed condition holding means 30A is fixed opposing to a movable magnetic pole 39 fixed to the sliding door 1A. The door closed condition holding means 30A consists of a cylindrical permanent magnet 31A and a pair of magnetic pole pieces 32A to surround the permanent magnet 31A. By the rotation of 90 deg. of the permanent magnet 31A, the closed condition of the sliding door 1A is released or maintained. A gear 42 to engage with a rack 41 is fixed to the permanent magnet 31A. A magnet 52 to attract the needle 4b is provided between the needle 4b and the rack 41, and it attracts the needle 4b over the distance of the gap x, while the needle 4b is escaped from the attraction when it is opened in excess of the gap x.</p> |
