Title:
FIRE ALARM
Document Type and Number:
Japanese Patent JP3791852
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To facilitate the test of a fire sensor from the outside of a dwelling by check-operating each fire sensor based on a signal from the input side of an output wire send-wired from a receiving part in an opening state and outputting a check signal to the signal wire.
SOLUTION: At the time of checking, a checking device 12 is connector- connected to a connector 11 drawn out to the side of an outdoor display 10 from a line switching device 6. Based on operation from this connector 12, the line switching device 6 check-start-outputs to a fire receiver 1 through a check output wire 9 to make the fire receiver 1 display that the fire sensor is in the middle of checking and cuts off the signal wires 2 and 3 to each fire sensor 4 from the fire receiver 1 to connect with the checking device 12. The fire receiver 1 check-displays based on the check start output of the line switching device 6 so that outdoor check from the checking device 12 is attained. Then after finishing the check of each sensor 4, the output wire 7 is connected to a common wire 2 through a terminating diode 8 and the checking device 12 detects a current flowing through the terminating diode 8 to stop its output.
Inventors:
Nobuyuki Ichikawa
Kaoru Takahashi
Hirooka Eiji
Kaoru Takahashi
Hirooka Eiji
Application Number:
JP31626995A
Publication Date:
June 28, 2006
Filing Date:
December 05, 1995
Export Citation:
Assignee:
Nomi Disaster Prevention Co., Ltd.
International Classes:
G08B29/02; G08B17/00; G08B29/14; (IPC1-7): G08B29/02; G08B17/00; G08B29/14
Domestic Patent References:
| JP6064662B2 | ||||
| JP7282367A | ||||
| JP3058198A | ||||
| JP8305977A |