| 摘要 |
PROBLEM TO BE SOLVED: To prevent removal of the faceplate of a landing button by nasty mischiet. SOLUTION: A detecting switch 5A is secured to the front end of the lower part of a box 3 at the rear of buttons 4A, 4B. The detecting switch 5A is secured in place in such a way that its contact is turned off when the back of the faceplate 1 located at the front end of the detecting switch 5A leaves a landing wall 2. The contact is connected to a variety of alarm devices or monitoring boards via a control board for, e.g. the operation of a buzzer in the landing or for reporting to monitoring personnel in a monitoring room is performed. |
