Key-ring-mountable alarm device

Details Key-ring-mountable alarm device Key-ring-mountable alarm device

1987-11-23

1989-02-21

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6179, 200 6180, 340384E, G08B 1500

Patent

active

048069116

ABSTRACT:
A key-ring-mountable portable alarm device has a battery operated audible alarm and a triggering means having multiple modes of operation. The triggering means provides for momentary operation of the alarm, continuous operation of the alarm and reset of the alarm. The triggering means includes two slide activation mechanisms which interlock and serve together as an electrical switch controlling the battery circuit. The alarm is based on a square wave oscillator coupled to a piezo-electric loudspeaker having sufficient power to cause pain or discomfort to a human at close range. The fundamental of the output signal is selected to be in the range of optimum hearing, preferably between 2,000 Hz and 4,000 Hz.

REFERENCES:
patent: 3825833 (1974-07-01), Bogue et al.
patent: 4158197 (1979-06-01), Takagaki
patent: 4241332 (1980-12-01), Farque
patent: 4284982 (1981-08-01), Downey
patent: 4386341 (1983-05-01), Yamamoto
patent: 4404549 (1983-09-01), Berg
patent: 4633232 (1986-12-01), Nelson et al.

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