Patent ID: 6016099
Filing Date: 2000-01-18
Classification: G08B

Abstract:
A personal alert safety system having condition responsive sensor means and alarm means indicative of personal safety conditions comprising; a small size portable casing, said casing comprising an internal divided two part chamber, the first part being a watertight sealed cavity and the second part being a sound resonating cavity with surrounding walls including at least one sound port providing a passage from the interior to the exterior of said resonating cavity; a sealed flat wall means comprising a dividing wall between said two chamber parts electric and electronic control and operating circuitry means disposed in said first part of said chamber including a source of electric power, two series connected, single pole, push button control switches each having ""on"" and ""off"" positions and being spring biased to the ""off"" position, and flip-flop electronic switching means controlled by said control switches to enable said circuitry means to be turned ""on"" and ""off"" respectively by a sequence of simultaneous operations of said two control switches; said sealed flat wall means comprising a thin flat sound generating piezoelectric transducer device electrically connected to said circuitry means; a motion detector, and means rigidly mounted said motion detector within said first part of said two part chamber, said motion detector generating a sine wave voltage output a characteristic of which changes responsive to motion of said casing; and said circuitry means further including a tone oscillator, a rate oscillator and an amplifier, connected between said motion detector and said piezoelectric sound generating transducer and responsive to the output of said motion detector and said piezoelectric sound generating transducer and responsive to the output of said motion detector to cause a specific high intensity sweeping alarm signal to be emitted when the circuitry means is turned on and in the event that the casing is motionless, wherein improvement comprising:said portable casing being semi-transparent and illuminating from within, the said illumination causing said portable casing to glow, change color or color pattern;a key retaining bump positioned on a top portion of said semi-transparent casing;a key retaining slot positioned on a bottom portion of said semi-transrarent casing;a removable tethered spring loaded tally key having at least one embedded magnet and a retaining window, said at least one embedded magnet automatically causing the personal alert safety system to activate when said tethered spring loaded tally key is removed, an said retaining window accommodating unique identification means for uniquely identifying said tally key with the personal alert system; anda magnetically activating reed switch positioned on a front face portion of said semitransparent casing above said key retaining slot and electrically connected to said circuitry means for sensing the presence or absence of the magnetic field embedded in said tally key.