Moving wall test device in optical smoke detectors

Details Moving wall test device in optical smoke detectors Moving wall test device in optical smoke detectors

1981-11-09

1984-12-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, 356338, G08B 1710, G01N 2153

Patent

active

044880499

ABSTRACT:
An optical smoke detector has an optical block canopied by a substantially broad surfaced wall member that is pivotally attached to the opposite sides of the optical block and substantially spaced from the active surface of the optical block itself such that the sides of the wall member are open to stray ambient light. Manual owner-test-actuation of the alarm is accomplished by depressing an externally extending push-button which in turn gradually moves the wall member inwardly of the optical block. The gradual and consequent decrease in reaction volume between the light scattering surface of the moving wall member and the optical block, the optical block housing an infrared light emitting diode and an infrared photosensitive cell, creates a simulated atmosphere of smoke infiltration so as to cause an associated alarm circuit to be innervated.

REFERENCES:
patent: 4144458 (1979-03-01), Doherty
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4374329 (1983-02-01), Schoenfelder et al.

Affiliated with

Also associated with

Rating

Moving wall test device in optical smoke detectors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Moving wall test device in optical smoke detectors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Moving wall test device in optical smoke detectors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1465388