Smoke chamber as audio chamber in audible alarm devices
AssigneeElectronic Modular Services Ltd.
InventorsSteven Walker, Doug Lawrence
Life of this patent
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Abstract
A smoke detector with an audible alarm wherein the smoke detection chamber is also an acoustic chamber for spreading the sound waves generated by the piezoelectric sounder as alarm signal. A slim profile can be obtained.
Claims19
The AAD of claim 1 wherein the smoke chamber includes a deflector ring connected within the top portion, the deflector ring being axially proximate and radially outside the piezo sounder, wherein the deflector ring has an arcuate cross section that opens in an axially downward direction to redirect sound that is resonating off the bottom surface, whereby the sound propagates toward the circumferential opening.
The AAD of claim 1 wherein an axial span of the top portion and an axial span of the bottom portion are the same.
The AAD of claim 1 including a filter disposed within the smoke chamber, the filter being disk shaped, radially centered within the top portion and being axially aligned with circumferential opening.
A method of propagating sound from a audible alarm device (AAD), wherein the AAD includes:
- a housing extending upwardly in an axial direction and outwardly in a radial direction, the housing including a bottom portion that is an axial bottom portion and a top portion that is an axial top portion,
- the top portion including a smoke chamber defined by:
- a top surface that is substantially planar and having a first diameter, a bottom surface separating the top portion from the bottom portion, the bottom surface being substantially planar and having a second diameter that is larger than the first diameter, a side surface that connects the top surface with the bottom surface, and a circumferential opening in the side surface providing fluid egress to the smoke chamber,
- a piezo sounder being disposed in the smoke chamber, radially centered within the top portion and axially proximate the top surface of the top portion,
- the method comprising directing sound from the piezo sounder to the bottom surface, whereby the sound resonates in the smoke chamber and spreads while propagating out of the smoke chamber through the circumferential opening.
Dependencies are inferred from the claim text.