Smoke detector with test apparatus

Details Smoke detector with test apparatus Smoke detector with test apparatus

1981-04-24

1983-02-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356338, 340630, G08B 2900

Patent

active

043743293

ABSTRACT:
A photoelectric smoke detector includes a light source and a light responsive cell and a smoke chamber therebetween all located within a generally cylindrical inner housing which is in turn concentrically located within a generally cylindrical outer housing. The inside surface of the outer housing is reflective, but the inner housing normally prevents light emitted by the light source into the smoke chamber from striking the outer housing. The inner housing contains one or more windows and is rotatable to move the windows to a position wherein light from the source can pass therethrough to the reflective surface of the outer housing and be reflected thereby back to the light responsive cell. The amount of light striking the reflective surface can be continuously adjusted between a normal condition when no light is reflected and a full test condition when a maximum quantity of light is reflected to the light responsive cell. Instead of having windows therein, the inner housing may alternatively have reflective portions thereon. The inner housing is resiliently biased to its normal condition and an actuating tool is provided for effecting rotation thereof.

REFERENCES:
patent: 3882477 (1975-05-01), Mueller
patent: 4053785 (1977-10-01), Lee et al.
patent: 4099178 (1978-07-01), Ranney et al.

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