Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-04-05
1987-06-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340630, G01N 2153, G08B 1710
Patent
active
046722173
ABSTRACT:
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 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 photosensor.
REFERENCES:
patent: 4074341 (1978-02-01), Niederost et al.
patent: 4206366 (1980-06-01), Marsocci et al.
patent: 4236822 (1980-12-01), Jaretsky et al.
patent: 4488049 (1984-12-01), Marsocci
patent: 4539556 (1985-09-01), Dederich et al.
1984 Catalog G; Alarm Supply Co., Inc.
General Signal Corporation
Hubbard Robert R.
Kleinman Milton E.
Westin Edward P.
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