Light-scattering-type smoke detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 4, 1991
Grant Date -
N/A
app pub date -
Apr 26, 1990
filing date -
May 2, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light-scattering-type smoke detector is disclosed which comprises a base portion to be secured to a ceiling, a head part forming one of the parts of a detecting portion to be detachably mounted to the base portion through setscrews passed therethrough, and a dark box forming the other of the portions of the detecting part to be detachably connected to the head part by screwing the setscrews thereto, the dark box comprising a body portion and a cover portion put one upon another. The body portion has a printed circuit board integrally secured thereto on its upper surface and the dark box is surrounded by a labyrinth around its outer periphery that is internally provided with a light projection element and a light receiving element. The smoke detector allows the dismounting of the head part from the base portion, and the dark box from the head part so that maintenance and repair of the smoke detector can be carried out quite easily.
First Claim
Family
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Cited Art Landscape
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