| 摘要 |
PURPOSE:To operate an alarm to tell a driver by a method wherein a movable contact is contacted with a fixed contact when an obstacle contacting bar attached to a lower portion of a chassis horizontally is contacted with an obstruction and oscillated. CONSTITUTION:When an obstacle is contacted with a bar, the bar is oscillated because a base portion of an arm 2 is oscillatably supported with a spring 6. Accordingly to the oscillation, an oscillating pin 10 engaged with a vertical pin 9 is moved to the left and right, therefore, a movable contact 11 arranged above a head of the vertical pin 9 is contacted with a fixed contact 14 and sends a danger signal to an alarm. Thereby, a driver senses the danger without a moment's delay and can deal promptly with avoidance of the danger. |
