Security system

Details Security system Security system

1985-03-21

1986-08-05

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340545, 340668, 116 6, 116 75, 116 86, 116 92, 200 6118, 200 6181, G08B 1312

Patent

active

046046097

ABSTRACT:
A security arrangement for a closed door having an elongated member connected between the door and the wall and a tautly mounted string joining the door knob and an electrical switch on the wall, the string passing over the elongated member. When an attempt is made to open the door tension on the string is increased resulting in the switch being moved into its closed position thereby energizing an alarm device.

REFERENCES:
patent: 198337 (1877-12-01), Bolt
patent: 2228120 (1941-01-01), Koehler
patent: 4205305 (1980-05-01), Nakada

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