Piezoelectric horn and a smoke detector containing same

Details Piezoelectric horn and a smoke detector containing same Piezoelectric horn and a smoke detector containing same

1978-10-25

1981-08-04

Robinson, Thomas A.

Communications: electrical

Condition responsive indicating system

Specific condition

340384E, 250381, G08B 1710, G08B 300, G01T 118

Patent

active

042825202

ABSTRACT:
An ionization smoke detector having two ionization chambers, one completely open to the ambient atmosphere and the other, a reference chamber, in communication with the atmosphere only through a breather tube having a defined length to diameter ratio. The detector employs a piezoelectric horn mounted on a cylindrical tube-like structure and attached to a printed circuit board containing one or more holes opposite the horn element so as to form a resonant chamber. The invention further contemplates a test switch which can be used to determine whether the battery is charged and the circuits are functioning.

REFERENCES:
patent: 3879726 (1975-04-01), Sweany
patent: 3953844 (1976-04-01), Barr et al.
patent: 4035788 (1977-07-01), Barr
patent: 4081684 (1978-03-01), Wieder
patent: 4096473 (1978-06-01), Sweany et al.

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