| 摘要 |
<p>PURPOSE:To enable an entrance lamp to be turned on or lowered in brightness remotely from a first and a second household. CONSTITUTION:A first three way switch 12 is disposed at a first household where the switch includes a common contact 120 connected to one output terminal of a power supply through an entrance lamp and a first and a second switch-over contact 121 and 122. And a four way switch 14 is disposed at a second household where the switch includes a first and a second common contact 1401 and 1202 connected to the first and second switch-over contacts 12 and 12 of the first three way switch 12 respectively and the first and second switch-over contacts 141 and 142. Furthermore, a second three way switch 13 is disposed at an entrance common to the first and second households where the second three way switch indlueds a common contact 130 connected to the other output terminal of the power supply, and a first and a second switch-over contact 131 and 132 connected to the first and second switch-over contacts 141 and 142 of a four way switch 14 respectively. By this constitution, the entrance lamp can be turned on or lower in brightness remotely from the first and second households.</p> |
