Fire detecting apparatus

Details Fire detecting apparatus Fire detecting apparatus

1994-08-03

1997-03-11

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340607, 340630, 55327, 55487, 110216, G08B 1700

Patent

active

056105924

ABSTRACT:
A first dust recovering part is disposed upstream in an air inlet passage from a fire detecting part. The air flow is deflected in the first dust recovering part so as to cause the dust to drop to separate from the air and to be recovered in a recovery area of the first recovering part. Farther downstream from the first dust recovering part, a second dust recovering part is arranged having a filter for recovering dust in the air which has passed through the first dust recovering part. Thus, clogging of the filter is avoided and erroneous operations caused by dust are more reliably reduced. As a result, the reliability of the fire detecting apparatus is improved.

REFERENCES:
patent: 3765842 (1973-10-01), Purt
patent: 4478619 (1984-10-01), Arends et al.
patent: 4680576 (1987-07-01), Bauer
patent: 4886527 (1989-12-01), Fottinger et al.
patent: 5420440 (1995-05-01), Ketler et al.

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