Smoke detectors

Details Smoke detectors Smoke detectors

Filed on

1980-11-25

Date issued

1982-11-30

Examiner

Anderson, Bruce C.

Patent Class

Radiant energy

SubClass

Invisible radiant energy responsive electric signalling

SubSubClass

Including a radiant energy responsive gas discharge device

Other Related Categories

250385, H01J 4702

Type

Patent

Status

active

Patent number

043617638

Description

ABSTRACT:
A smoke sensing detector for use with an indicating device comprises a chamber adapted to allow smoke to pass therethrough, an inner electrode carrying a radioactive source, a collector electrode having one or more holes and mounted on the inner electrode by insulating pillars, and an outer electrode. The collector and outer electrodes define a first ionization region, and the collector and inner electrodes define a second or reference ionizaton region which is comparatively little affected by the passage of smoke. Mounting the collector electrode on the inner electrode reduces costs, is easy and ensures that, in the event of insulation failure, the device is fail safe.

REFERENCES:
patent: 4012729 (1977-03-01), Weaver et al.
patent: 4150373 (1979-04-01), Ried
patent: 4185197 (1980-01-01), Byrne
patent: 4286160 (1981-08-01), Ried

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