P. R. Mallory Co.

Michael T Burk

Louis P Sweany

The electroacoustical properties of an electromechanical vibrating device for producing an audible signal are improved by attenuating undesirable frequencies of the audible signal to produce a predominant frequency and by accentuating the predominant frequency. The improvement includes a planar vibration diaphram comprised of a plastic polymer material, a vibrating striking member positioned to strike the vibration diaphram at its center; a bumper comprised of resilient material interposed between the vibrating striking member and the vibration diaphram, and a resonant chamber in spaced relation to the vibration diaphram having a resonant frequency substantially equal to the predominant frequency.

Means for improving the electroacoustical properties of a buzzer

A piezoelectric transducer and a voltage doubling means are utilized in conjunction with a power supply means, a pulsator means, an amplifier means, and an acoustical loading means to produce an efficient high output audible alarm device. The voltage doubling means and the acoustical loading means enhance the audible output of the alarm device while increasing the overall electroacoustical efficiency of the alarm.

High output audible alarm device utilizing a piezoelectric transducer

A high output smoke and heat detector alarm system comprises a high output audible alarm means which includes a piezoelectric transducer and a voltage doubling means in combination with an improved smoke and heat detector which includes a low voltage power supply source, an ambient temperature detecting means, at least one ionization sensing chamber, a voltage amplitude comparing means, and a low voltage sensing means.

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Indianapolis, IN, United States of America

Michael T Burk