Switch operated alarm circuit

Details Switch operated alarm circuit Switch operated alarm circuit

1977-12-19

1979-10-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

335206, 340545, G08B 1308, G08B 2900

Patent

active

041700058

ABSTRACT:
A burglar alarm that has a series of switches located close to each other and that are responsive to the application of a magnetic field. One of the switches terminates current flow to a sentinel current device while the others initiate current flow to the sentinel current device. The sentinel current device operates to supply voltage for an alarm circuit when it conducts only. Thus, in order to render the device ineffective, one must know how to apply a magnetic field to the terminating switch only without activating any of the switches that initiate current flow. The switches are all located close together so that special knowledge is required to cut off supply voltage to the alarm circuit.

REFERENCES:
patent: 2877361 (1959-03-01), Chase
patent: 2912540 (1959-11-01), Sawicki

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