Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-08-07
1988-04-12
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340540, 361119, G08B 2100
Patent
active
047377763
ABSTRACT:
The present invention is a circuit for activating a local alarm when a telephone service line is cut. A closed loop circuit is formed by a pair of insulated monitor wires electrically connected at their first ends to a resistor and electrically connected at their second ends to a normally closed circuit of an alarm. The wires are secured to a telephone service line. Shrink tubing encapsulates the wires and the service line together in a single cable. When the cable is cut, thereby severing either or both of the insulated monitor wires as well, the closed loop circuit is opened, thereby activating the alarm. In various embodiments of the invention, circuitry is provided upstream from the cable for signaling a telephone company of a loss of a service line connection. A load or signal is generated by the circuitry and transmitted over telephone service lines. When such a load is detected, proper authorities can be notified of the loss of the service line connection.
REFERENCES:
patent: 2691698 (1954-10-01), Schmidt
patent: 4012728 (1977-03-01), Fowler
patent: 4228424 (1980-10-01), Le Nay et al.
patent: 4310835 (1982-01-01), Sefton
Hofsass Jeffery A.
Rowland James L.
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