Communications: electrical – Systems – Signal box type
Patent
1980-10-06
1982-11-16
Brigance, Gerald L.
Communications: electrical
Systems
Signal box type
338 32H, 335205, G08B 1700
Patent
active
043597190
ABSTRACT:
An alarm pull station is provided having a housing for attachment to a support, a manually movable member mounted within the housing and having a magnet attached thereto, and a Hall effect switching device responsive to movement of the magnet for providing an output signal. The Hall effect switching device can include first and second Hall effect sensors arranged for providing three levels of output signal, a first normal level when the manually movable member is in its original, unoperated position, an alarm level when the manually movable member is operated, and a trouble level when the pull station is subject to tampering.
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Brigance Gerald L.
Honeywell Inc.
Joike Trevor B.
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