E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
E05B 47/00 (2006.01) E05B 49/00 (2006.01) G08B 25/04 (2006.01) H04B 3/54 (2006.01) H04M 9/00 (2006.01) H04M 11/02 (2006.01) H04M 11/04 (2006.01)
Patent
CA 2432404
The respective sections between a power source unit 4 and a room master station 1, between the room master station 1 and an entrance door station 2, and between the entrance door station 2 and an electric lock 3 are connected by transmission lines of two-wire system 6 for transmitting signals and electric power. When called by the entrance door station 2, the room master station 1 changes a DC voltage which is applied to the entrance door station 2 through the transmission line 6b. In accordance with the voltage change, the entrance door station 2 drives the entrance door station side transmitter circuit 33, thereby to permit the talk between the entrance door station 2 and the room master station 1. Besides, when an AC voltage for the release operation of the electric lock 3 is outputted from the room master station 1 to the transmission line 6b, a talk/electric lock changeover circuit 35 provided in the entrance door station 2 detects the AC voltage to separate the entrance door station side transmitter circuit 33 usually connected with the room master station 1 for the purpose of the talk and to connect the electric lock 3 to the room master station 1, whereby the electric lock 3 connected to the entrance door station 2 is permitted to be manipulated from the room master station 1 through the transmission line 6b.
Abe Tomohito
Noma Koji
Aiphone Co. Ltd.
Nelligan O'brien Payne Llp
LandOfFree
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