| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic door utilizing fluid pressure having a mechanism to absorb a shock produced inside a device when the flowing direction of fluid is changed suddenly. SOLUTION: This automatic door 10 comprises a driving cylinder 12 containing a magnet body 14 therein moved by a fluid pressure while one end side and the other end side of the magnet body are separated away from each other. An external bracket 16 having an annular magnet so as to be moved by the interaction of a magnetic force according to the movement of the magnet body 14 is fitted onto the door driving cylinder 12. A door 18 is installed continuously with the external bracket 16 so as to be opened and closed in connection with the movement of the bracket. A switching means 26 for switching the movement direction of the door 18 by switching the direction of the fluid pressure applied to the magnetic body 14 is connected to one end side and the other end side of the door driving cylinder 12. A damper cylinder 28 as a shock absorbing means for absorbing an abrupt variation in fluid pressure is connected between the switching means and the door driving cylinder. |
