Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-04-18
1981-03-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340384E, 3403091, 340600, G08B 1308
Patent
active
042557453
ABSTRACT:
A portable, miniaturized, self-contained audible alerting device is disclosed. The device is housed in a small case adapted to be positioned in a darkened enclosure, such as a medicine cabinet, for receiving light when the enclosure is opened, producing an audible signal after a predetermined time delay for altering a person some distance from the enclosure that the latter has been opened, e.g., by a child. Within the case is a photodetector positioned with respect to an aperture of the case which receives light upon opening of the enclosure. Also within the case is a time delay circuit responsive to the photodetector, a first oscillator controlled by the time delay circuit, an amplifier circuit and a transducer, for providing the audible alerting signal only after the time delay. A frequency control circuit, comprising a lower frequency oscillator, causes an output signal of the first oscillator to change repeatedly between upper and lower frequency limits. The time delay prevents the alerting signal from being given if the enclosure is opened and then closed quickly enough by a person knowing of the device, e.g., the parent of the child. The upper and lower frequency limits are such that the signal can be heard even by persons having frequency impaired hearing.
REFERENCES:
patent: 3683346 (1972-08-01), Horton
patent: 3922672 (1975-11-01), Birt et al.
patent: 4086589 (1978-04-01), Cieslak et al.
patent: 4155077 (1979-05-01), Rohan et al.
Kuehl Gregory W.
Rohan Joseph J.
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