| 摘要 |
PURPOSE:To inexpensively obtain a domestic smoke alarm by assembling a smoke sensing part in the electrical circuit of an electric alarm clock, and sharing the power source part and the buzzer part of the sensing part with the alarm clock and the smoke alarm. CONSTITUTION:A built-in timer 3 is used for the setting of alarm time, and the buzzer 4 of the alarm clock is rung at a time set by the timer 3. The operating part 5-1 of the smoke sensing part is operated setting a battery 1 as a power source, and senses smoke exceeding constant volume, and turns on the switching contact 5-2 of the smoke sensing part. In other words, the timer 3 and the switching contact 5-2 are connected to the buzzer 4 in parallel, and the buzzer is rung by the operation of the contact of either the sensing part or the contact. Therefore, a switch for smoke sensing part is operated as the smoke alarm, and the buzzer 4 is rung when the smoke exceeding the constant volume is detected. In such a way, the clock with smoke alarm can be inexpensively obtained. |
