Test means for light responsive smoke detector

Details Test means for light responsive smoke detector Test means for light responsive smoke detector

1977-04-07

1978-07-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

250574, 340630, G08B 2900

Patent

active

040991784

ABSTRACT:
A test means for a smoke detector of light responsive type which includes a light source, a smoke chamber, a light responsive device sensitive to a light beam reflected from a preselected density of smoke in the smoke chamber for actuating an alarm signal, the test means including the same light source and light responsive device and having a separate test light path other than through said smoke chamber with light modifying means in the test light path to simulate a preselected smoke density. The test means includes a normally closed gate for said test light path, the gate being manually opened to transmit light along said test path to the light responsive device to cause actuation of the alarm in the absence of smoke in the smoke chamber.

REFERENCES:
patent: 2437071 (1948-03-01), Cahusal et al.
patent: 2763853 (1956-09-01), Grant, Jr.
patent: 2783390 (1957-02-01), Mendenhall, Jr.
patent: 3028490 (1962-04-01), Guilleux
patent: 3240109 (1966-03-01), Grant, Jr.
patent: 3868184 (1975-02-01), Marsocci
patent: 4021792 (1977-05-01), Ludt et al.
patent: 4053785 (1977-10-01), Lee et al.

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