| 摘要 |
<p>PURPOSE:To detect a speed limiting zone on a fire extinguishing vehicle by disposing two memory type magnetic proximity switches on the vehicle, and alternately disposing magnets at the inlet and outlet of a speed limiting zone on the ground corresponding to the switches. CONSTITUTION:Memory type magnetic proximity switches 1A-1D for detecting a speed limiting zone are mounted on a vehicle. Magnets 3A, 3B are mounted at the inlet and outlet of the zone on the ground corresponding to the switches 1A-1D. The switches are held ON when the magnet passes in a direction of the arrow, and becomes OFF when it passes in a direction opposite to the arrow. The switches 1A, 1B can detect the zone at the side of the vehicle by taking AND condition of the switches 1A and 1B or 1C and 1D.</p> |
