| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely notify a landslide and a falling rock wherever they occur in a section where an alarm device is installed by constituting a unit by installing the alarm device on a pole and extending a wire between the units. SOLUTION: A unit 3 is constituted by installing the alarm device 2 on the pole 1 of a block of wood and a rope 4 is extended between the units 3. A hole 10 to lead the lope through is provided on the pole 1 and the rope 4 is lead through the hole. A buzzer amplifier port 21 is provided on the alarm device 2 and a light emitting device 20 is installed on the alarm device 2. The pole 1 is set up by sticking on the ground and the rope 4 is extended between the poles 1. Consequently, contacts of the alarm device 2 is connected by transmitting the landslide and the falling rock occurred at a position where the pole 1 is installed with the rope 4 and an alarm is issued thoroughly, extensively and successively.</p> |
