Ionization smoke detector

Details Ionization smoke detector Ionization smoke detector

1979-01-29

1983-05-10

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, 313 54, G08B 1710

Patent

active

043832539

ABSTRACT:
The detector comprises a first electrode defined by a bolt mounted on an annular insulator which in turn is mounted on a printed circuit board and a second electrode defined by a cup shaped member which is aligned with the bolt and positioned with the interior thereof facing and being spaced from the bolt. A source of radiation is mounted on the head of the bolt and a third electrode is spaced outwardly from and laterally to one side of the head of the bolt. A box-shaped electrostatic shield is fixed to the printed circuit board and has an opening in which is positioned the cup shaped member. The shield serves to enclose the space between the rim of the cup shaped member and the printed circuit board. An annular insulator is mounted on and about the bolt. The third electrode has a rectangular base portion mounted on the annular insulator and a rectangular plate portion which extends outwardly from the base portion and which lies in a plane which is parallel spaced from the axis of the bolt forming the first electrode. The sidewalls of the cup shaped member have portions thereof punched inwardly to provide inlets for ambient air into the space within the cup shaped member and between the cup shaped member and the bolt.

REFERENCES:
patent: 3795904 (1974-03-01), Beyersdorf et al.
patent: 3946374 (1976-03-01), McMillian et al.
patent: 4150373 (1979-04-01), Ried, Jr.

Affiliated with

Also associated with

Rating

Ionization smoke detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ionization smoke detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionization smoke detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-528126