Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-04-25
1990-07-31
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
335206, 335207, G08B 1308
Patent
active
049453408
ABSTRACT:
A security system for use in a physical security monitoring environment includes a switch unit having a common conductor, a guard conductor and at least three switches. Each of the switches has a deactivated condition and an activated condition and each is adapted to be placed in its activated condition in response to a magnetic field of predetermined magnetic flux. The switch unit also includes a logic circuit electrically interconnecting the switches and the common and guard conductors, the logic circuit completing a series circuit between the common conductor and the guard conductor whenever at least two predetermined but not all switches are in magnetically actuated condition. An associated actuator unit includes at least two permanent magnets and provides discrete magnetic fields of predetermined flux density and position sufficient to activate the two or more predetermined switches individually to complete the series circuit between the common conductor and the guard conductor when the actuator unit is located in predetermined juxtaposition with respect to the sensor unit.
REFERENCES:
patent: 2912540 (1959-11-01), Sawicki
patent: 3668576 (1972-06-01), Harman
patent: 4170005 (1979-10-01), Duke
patent: 4210889 (1980-07-01), Holce
patent: 4580062 (1986-04-01), MacLaughlin
patent: 4661805 (1987-04-01), Salzer
patent: 4806910 (1989-02-01), Salzer
Pittway Corporation
Swann III Glen R.
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