Conrac Corporation

John M Macmillan

Hilario S Costa

Smoke detector housing

A housing assembly of interlocking parts for a dual-chamber ionization smoke detector in which the assembly has a single universal smoke detector head that can be readily twist-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 ionization 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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Deep River, CT, United States of America

John M Macmillan