Alarm apparatus for detecting disturbance or other change of con

Details Alarm apparatus for detecting disturbance or other change of con Alarm apparatus for detecting disturbance or other change of con

1978-06-07

1981-02-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specified indicator structure

200 43, 310321, 340546, 340689, G08B 1308, G08B 1314

Patent

active

042530954

ABSTRACT:
A compact portable housing encloses a piezoelectric element which receives short pulses from a pulse generator circuit controlled by a ramping waveform generator circuit so that the element and the adjacent speaker portion of the housing produce a frequency modulated loud sweeping sound. The housing also encloses a detector switch for sensing a disturbance, and the sensitivity of the switch may be adjusted according to the position of the housing. The detector switch actuates a timer circuit which is armed or disarmed by moving a combination code switch having code wheels projecting from the housing.

REFERENCES:
patent: Re28745 (1976-03-01), Smith
patent: 2146271 (1939-02-01), Schafer
patent: 2517619 (1950-08-01), Ainley
patent: 3277465 (1966-10-01), Potter
patent: 3331970 (1967-07-01), Dundon et al.
patent: 3514556 (1970-05-01), LaFrance
patent: 3725896 (1973-04-01), Wagner
patent: 3728675 (1973-04-01), Horn et al.
patent: 3838418 (1974-09-01), Brown
patent: 4100543 (1978-07-01), Stockdale et al.
patent: 4104628 (1978-08-01), Sweany et al.
patent: 4112267 (1978-09-01), Zangrando
patent: 4122437 (1978-10-01), Peterson

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