Apparatus for controlling a power source for an electrical alarm

Details Apparatus for controlling a power source for an electrical alarm Apparatus for controlling a power source for an electrical alarm

1978-01-09

1980-05-27

Braun, Fred L.

Communications: electrical

Condition responsive indicating system

With particular system function

200 6193, 335205, 340541, 340568, G08B 1900, H01H 900

Patent

active

042053285

ABSTRACT:
A key holding member of elongated shape having a rod of permanent magnet embedded therein or a sheet of permanent magnet adhered thereto, which, when put into its corresponding opening for receiving the key holding member in the key box provided at the front of a hotel or the like, comes close to a reed switch provided in the key box. In this manner the reed switch is rendered operative to close or open the electrical circuits connected to the reed switch so as to turn "on" or "off" a lamp which shows that the room is left absent and to cause an alarming device to alarm whenever the room is broken into or a fire starts in the room.

REFERENCES:
patent: 1623950 (1927-04-01), Sargent
patent: 2600309 (1952-06-01), MacDonald et al.
patent: 2931953 (1960-04-01), Barney
patent: 3069890 (1962-12-01), McKinney et al.
patent: 3682216 (1972-08-01), Nelson
patent: 3933017 (1976-01-01), Shee
patent: 4012732 (1977-03-01), Herrick

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