Smoke detector and housing assembly therefore

Details Smoke detector and housing assembly therefore Smoke detector and housing assembly therefore

1976-02-10

1978-12-12

Clark, Conrad J.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250574, 340630, 356338, 356440, G01N 2100

Patent

active

041293835

ABSTRACT:
A smoke detector and housing assembly therefore in which the housing components are designed to allow rapid assembly of the detector with a minimum amount of labor. In a preferred embodiment of the invention a retainer for a photo-cell and light source is provided with a medial portion retaining the photo-cell and portions extending forwardly from the ends of the medial portion for projecting a light beam through the field of view of the photo-cell. The retainer is molded in two similar halves and fastened together after assembly of the photo-cell, light source, and other components therein.
A base plate is provided with suitable apertures for receiving the forwardly projecting portions of the retainer so that after assembly they protrude from the forward face thereof. A cylindrical member and cover are mounted on the forward face of the base plate between the forwardly projecting portions of the retainer, forming a dark chamber across which the light beam projects, and into which the photo-cell views.
All of the components of the housing are formed of injection molded plastic, with suitable portions provided to accurately position the components in relation to each other during assembly.

REFERENCES:
patent: 3799670 (1974-03-01), Kohr
patent: 3914616 (1975-10-01), Moolbroek
patent: 3916209 (1975-10-01), Steele et al.

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