Acoustically coupled burglar alarm system

Details Acoustically coupled burglar alarm system Acoustically coupled burglar alarm system

1974-11-12

1976-08-03

Swann, III, Glen R.

Communications: electrical

Systems

Call station

116137A, 181139, 340416, G08B 1308

Patent

active

039732509

ABSTRACT:
An ultrasonic whistle is mounted together with a pin on a window or door so that movement of the window or door causes relative movement between the whistle and pin. Such movement releases compressed gas from a container which activates the whistle. A central monitor in the building detects the output of the whistle and provides an output to activate alerting devices.

REFERENCES:
patent: 2611334 (1952-09-01), Counts et al.
patent: 2905762 (1959-09-01), Rettie et al.
patent: 3125986 (1964-03-01), Fortman et al.
patent: 3230923 (1966-01-01), Hughes
patent: 3804053 (1974-04-01), Gray
patent: 3810146 (1974-05-01), Lieb
patent: 3863240 (1975-01-01), Galvin

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