| 摘要 |
PROBLEM TO BE SOLVED: To prevent derailing of a railroad vehicle, when vibrations due to an earthquake or abnormal vibrations due to another reason are generated. SOLUTION: An image of a contact surface between a rail and a wheel during travelling is obtained by an image sensor installed near the wheel of a vehicle body of a train. When it is detected that data of the contact surface is abnormal, a rod-shaped latch in an earthquake-resistant derailing preventive latch device mounted at a lower part of a vehicle from a space is expanded into a range reaching a space closer to a bottom surface of the rail than a space wherein a flange of the wheel passes near the rail, thereby preventing derailing. When the expanded latch contacts with a structure on the rail, a fulcrum of rotations is set on an upper part of the latch, and the latch is rotated about that point to prevent becoming an obstacle of travelling of the vehicle. COPYRIGHT: (C)2005,JPO&NCIPI
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