US 4,383,186 AGranted

Electrical switching apparatus

OwnerChristopher Lianginventor

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Abstract

Electrical switching apparatus comprises first and second plugs, each with a lead attached thereto, and a load socket which is connected to the second plug through a switching assembly. The first plug is connected to a wall socket controlled by a remote switch. The second plug is connected to a permanently live wall socket. The switching assembly comprises two switches, one operated by adjacent manual control means, the other being an electromagnetic relay operated, via the first plug and lead, by the remote switch. Each of the switches in the switching assembly has first and second positions. When each switch is in its first position, and when each switch is in its second position, the load socket is connected to the live wall socket. When one switch is in its first position and the other in its second position, the load socket is disconnected. In this way the load socket can be connected or disconnected by operating either the remote switch or the adjacent manual control means.

Electrical switching apparatus which can be easily connected to and disconnected from existing sockets in conventional electrical wiring of a building, and which comprises

(1) a first plug connectable to a first power socket which can be switched on or off by a remote switch which is manually operated at a location remote from the socket;
(2) a first electrical lead connected to the first plug;
(3) a second plug connectable to a second power socket which is normally switched on;
(4) a second electrical lead connected to the second plug;
and
(5) a load socket which is connectable to an electrical load and to which the second lead is connected through;
(6) a switching assembly which comprises
(a) a first conductor;
(b) a second conductor;
(c) a first switch which has a first position wherein it is connected to the first conductor and disconnected from the second conductor and a second position wherein it is connected to the second conductor and disconnected from the first conductor;
(d) a first switch-controlling means which is associated with the first switch and with the first lead, whereby when the first plug is connected to the first power socket, the first switch is in its first position when the first power socket is on and in its second position when the first power socket is off;
(e) a second switch which has a first position wherein it is connected to the first conductor and disconnected from the second conductor and a second position wherein it is connected to the second conductor and disconnected from the first conductor;
and
(f) a second switch-controlling means which is adjacent to the second switch and which can be manually operated to move the second switch between its first and second positions
whereby, when the first plug is connected to the first power socket, the second plug is connected to the second power socket and the electrical load is connected to the load socket, the load can be connected to or disconnected from the second power socket either by operating the remote switch or by operating the second switch-controlling means.

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Abstract

Claims8