Communications: electrical – Systems – Call station
Patent
1974-05-10
1976-05-25
Caldwell, John W.
Communications: electrical
Systems
Call station
250381, G08B 1710, H01J 3928
Patent
active
039597881
ABSTRACT:
An ionization-type fire detector having a pair of ionized chambers, one of which is arranged so that products of combustion can flow therethrough while the other is substantially isolated from the products of combustion. As a result, when combustion products are present, the electrical conductivity in one chamber is different than the other, and this condition is sensed to provide a fire alarm signal. The first-mentioned ionized chamber is defined by inner and outer shells of plastic material which are suitably spaced from each other and with the inner surface of the outer shell being provided with a conductive coating. The spaced plastic surfaces are curved, and one of the shells defines a cavity which forms at least a part of said first-mentioned chamber. It has been found that this minimizes the adverse effects caused by wind drafts which otherwise can affect the electrical conductivity in the first chamber and provide an erroneous fire alarm signal. The overall arrangement of the detector is such as to provide a compact unit which is attractive in appearance and relatively low cost to manufacture.
REFERENCES:
patent: 3460124 (1969-08-01), Smith et al.
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3681603 (1972-08-01), Scheidweiler et al.
patent: 3731093 (1973-05-01), Scheidweiler et al.
Suchomel Michael
Taran John Z.
Tipton William C.
Caldwell John W.
General Signal Corporation
Myer Daniel
LandOfFree
Ionization-type 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 Ionization-type fire detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionization-type fire detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-909616