| 摘要 |
PURPOSE:To eliminate a bad influence caused by chattering in case an alarm switch becomes off, by generating an alarm sound, only when two pieces of arm parts which have been formed in an alarm spring have contacted a contact simultaneously. CONSTITUTION:Two pieces of arm parts 5a, 5b are formed in an alarm spring 5. Each arm part 5a, 5b contacts the contacts 6a, 6b corresponding to each of them simultaneously at a set time, and also disconnected from each contact 6a, 6b at a time difference. Only when each arm part 5a, 6b has contacted the contacts 6a, 6b simultaneously from a non-contact state, an alarm sound is generated. |
