Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-11-16
1989-08-08
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6176, G08B 1308, H01H 316
Patent
active
048557153
ABSTRACT:
An alarm system mounted in a casing intended to be installed in a door. The casing includes a power supply, a noise producing device and a circuit for connecting the power supply to the noise producing device. The circuit includes a key operating device and a mechanism responsive to a detecting knob located on the stile of a door. The key operating device comprises a tumbler switch and a cam operated by the switch which is mounted in the circuit. The mechanism responsive to the knob comprises a hingely mounted plate connected to a spring for biassing the plate in the direction of the cam and the switch. The switch can close the circuit when the door opens and the knob projects outside the stile of the door. Additional cams, tumbler switches and circuits may be combined for producing a variety of alarm producing conditions.
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Morneau Roland L.
Mullen Jr. Thomas J.
Swann III Glen R.
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