Communications: electrical – Systems – Signal box type
Patent
1975-06-27
1977-05-17
Wannisky, William M.
Communications: electrical
Systems
Signal box type
346144, 361166, G08B 2500
Patent
active
040245276
ABSTRACT:
A plurality of watch stations are installed in protected premises that must be tripped in proper sequence once each hour and embodies means whereby when the watchman comes on duty and starts his rounds of duty, a signal will be transmitted to the central station and when he has completed the rounds of stations a second signal will be transmitted to the central station indicating that all is well. In the event the proper sequence of operation of the watchman's stations is broken, an alarm will be indicated in the central station. Thus the central station receives only two signals regardless of the number of stations on the watchman's route unless there is something wrong with the watchman and he is in need of help. The present system is designed to prevent tampering with the system, to prevent the system being turned off prior to the end of the watchman's tour of duty, and to permit the watchman to signal for outside help from anyone of the stations on his tour.
The signalling system further includes a timer controlled visible signal ignited when the watchman comes on the job and turns on the system and which visible signal is turned on after the watchman has operated the last signal box in the system to indicate the interval of time until the watchman must start his tour of the signal boxes, together with an audible signal controlled by the timer which is energized in the event the watchman does not start his tour of the signal boxes when the visible signal is extinguished.
REFERENCES:
patent: 3237183 (1966-02-01), Eagan
patent: 3736561 (1973-05-01), Rumpel
patent: 3774193 (1973-11-01), Restrepo
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