| 摘要 |
PURPOSE:To prevent easily and exactly a titled service car from colliding with an obstacle at the time of moving backward, by raising an alarm in case when a distance to the obstacle measured by a contactless sensor provided on the rear end part of the service car becomes a set value or less. CONSTITUTION:A contactless sensor provided with a transmitting part 14 and a receiving part 15 of an ultrasonic wave is provided on the rear end part of a machine body. This contactless sensor measures a distance to an obstacle B being in the rear of the machine body. When this measured distance becomes a prescribed value or less set in advance, an alarm device 17 outputs an alarm automatically. Accordingly, a driver can recognize easily the fact that the machine body approaches the obstacle. In this way, it can be prevented easily and exactly that the machine body collides with the obstacle at the time of moving backwards. |
