Alarm buzzer apparatus
AssigneeMarine Resources, Inc.
InventorClaude C. Sims
Life of this patent
Estimating the term…
Abstract
An alarm buzzer for fire alarms, burglar alarms, and the like, is provided using a conventional piezoelectric transducer driven by a battery operated oscillator and mounted in a casing. The casing has a resonance cavity formed therein with the transducer mounted adjacent thereto and having an open end. A grill is mounted to the casing and extends over the resonant cavity and spaced therefrom by a predetermined spacing and a reflector plate is mounted onto the grill covering the grill portion facing the resonant cavity, whereby the efficiency of an alarm buzzer is increased by the combination of a resonance cavity and folded horn.
Claims10
An alarm buzzer consisting in combination:
- a casing having a resonance cavity formed therein, said cavity having side walls and an open end;
- a transducer mounted to said casing adjacent said resonant cavity;
- an oscillator operatively coupled to said transducer for actuation thereof;
- a grill attached to said casing and extending over said casing resonance cavity open end and being spaced from said side walls thereof;
- and
- a reflector plate covering at least a portion of said grill extending over said resonance cavity, whereby an alarm buzzer is formed with a resonance cavity folded horn to increase the level of response therefrom.
Dependencies are inferred from the claim text.