Smoke and fire detector

Details Smoke and fire detector Smoke and fire detector

1986-08-01

1989-07-04

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 340384E, 250381, 250384, G08B 1710

Patent

active

048454745

ABSTRACT:
An ionization smoke and fire detector comprises a molded plastic housing that includes a nodal ring for supporting a vibrating plate that is part of an alarm. The alarm may be driven by piezoelectricity or by an electromechanical device. If the detector is battery powered, a portion of the housing is cut out to permit removal and insertion of a battery holder that makes contact automatically upon insertion to supply electric power to the electronic circuit of the smoke detector. One electrode of a reference chamber for the smoke detector is formed by wave-soldering an open metallized area on the printed-circuit board. Contact with the movable element of the alarm and with a high-impedance input in an integrated circuit are made through springs that are not soldered or welded. The outside of the smoke and fire detector is formed in part by a smoke-chamber cover which makes various electrical contacts with the printed-circuit board at electrical conductors that are bent around the edge of the board and wave-soldered. The smoke and fire detector is assembled without screws and all electrical connections among components are made without welding, hand soldering, or any soldering beyond wave soldering of a printed-circuit board.

REFERENCES:
patent: 4075487 (1978-02-01), Larsen
patent: 4223305 (1980-09-01), Arima
patent: 4238788 (1980-12-01), Rosauer et al.
patent: 4282520 (1981-08-01), Shipp et al.
patent: 4306299 (1981-12-01), Tamura et al.
patent: 4383253 (1983-05-01), Lam et al.
patent: 4471346 (1984-09-01), Nelson et al.
patent: 4484181 (1984-11-01), Schwartz
patent: 4574272 (1986-03-01), Brown
patent: 4595914 (1986-06-01), Siegel
patent: 4604606 (1986-08-01), Sweany

Affiliated with

Also associated with

Rating

Smoke and fire 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 Smoke and fire detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Smoke and fire detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-855615