Dual-chamber ionization smoke detector assembly

Details Dual-chamber ionization smoke detector assembly Dual-chamber ionization smoke detector assembly

G - Physics

01

T

358/21

G01T 1/18 (2006.01) G08B 17/113 (2006.01)

Patent

CA 1130933

ABSTRACT A housing assembly of interlocking parts for a dual- chamber ionization smoke detector in which the assembly has single universal smoke detector head that: can be readily twis~-locked in one of a plurality of selectable adapter bases appropriate for a particular power source. The smoke -detector head includes an interlocking assembly of an ionization chamber module protectively housed between an adapter base cover and a smoke detector cover. The detector head may be removed as a single subassembly from a particular adapter base, and additionally the detector head may be readily disassembled to remove the ionization chamber module for repair or replacement. The smoke detector cover has a dish-like configuration formed with an integral frusto-conical section. The interior of this section is formed with smoke deflector ribs. The cover protectively covers both the ioniza- tion smoke chamber and the adapter base. The ionization chamber module includes an exterior field-effect transistor shield which not only attenuates stray fields but also enables the protective spray coating of the transistor to minimize false alarms.

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