G - Physics – 08 – B
Patent
G - Physics
08
B
340/140.1
G08B 17/10 (2006.01) G08B 17/107 (2006.01) G08B 29/14 (2006.01)
Patent
CA 1242257
PHOTOELECTRIC SMOKE DETECTOR Abstract of the Invention A photoelectric smoke detector which operates on the scattered light principle and involves a light source, and a photosensor placed at an angle to the light beam such that it is normally not illuminated, the light source and photosensor being located within a dark detection chamber having air entry ports that restrict ambient light; smoke particles entering the smoke chamber produce interruption of the light beam, thereby scattering light beam, thereby scattering light onto the photosensor. The detection chamber is formed within a cup-shaped grill which can be readily removed from the housing by rotation of the grill to disengage a locking mechanism; the grill is provided with an end wall and, integrally formed therewith, spaced inner and outer cylindrical side walls, the inner side wall being defined by baffles which include scoop fins that are used to trap light, but which also function to scoop air into the chamber and cause air turbulence for mixing the smoke particles thoroughly; the outer side wall having windows for entry of smoke. The smoke detector may be tested by inserting a special probe into a hole located at the center and top of the grill, the probe interrupting the light beam and causing reflection of light onto the photo- sensor.
504722
Borden Ladner Gervais Llp
General Signal Corporation
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