Light-scattering-type smoke detector

Details Light-scattering-type smoke detector Light-scattering-type smoke detector

1990-04-26

1991-06-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, G01N 1506

Patent

active

050216775

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.

REFERENCES:
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4269510 (1981-05-01), Horvath et al.

Affiliated with

Also associated with

Rating

Light-scattering-type smoke detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light-scattering-type smoke detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light-scattering-type smoke detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1028509