| 摘要 |
PURPOSE:To eliminate management for renting only one type of required key by a method wherein the normal open contact in a solenoid means is closed when a door switch is operated to open position while simultaneously the normal close contact in the control source circuit line to the solenoid means for another door is opened when the door switch is operated. CONSTITUTION:When the door of a switchboard 1B is opened, a key switch 4 is operated at first to open position by means of a key. Consequently, the contact 4a at the switchboard 1B section is made and a solenoid means 5 is excited thus unlocking the door 2. On the other hand, the contact 4a is broken through the operation of the key switch 4 and the open circuit line to the solenoid means 5 for other switchboards 1A, 1C, 1D is opened thus locking the door 2. Consequently, when some door is opened, door lock condition of other switchboard is maintained. |
