G - Physics – 08 – B
Patent
G - Physics
08
B
358/21
G08B 17/00 (2006.01) G08B 17/11 (2006.01) G08B 17/113 (2006.01)
Patent
CA 1076717
ABSTRACT OF THE DISCLOSURE Two cup-shaped electrodes respectively defining outer walls of a closed and an open ionization chamber and an insulator wall sandwiched therebetween defining an interior wall of both chambers and carrying both an electrode common to both chambers and a circuit element of a sensing circuit responsive to the relative impedances of the two chambers for indicating the presence of smoke in the open chamber. Mini- mizing leakage current-increasing factors as moisture, dust, etc., the body of the circuit element is protectively mounted to the insulator wall within the closed chamber by means of a plurality of leads extending through mating holes in the insulator wall with a header surface of the body pressed against the wall. One of the leads is folded around the edge of a hole in the wall wherein the common electrode is mounted and is squeezed between the insulator wall and a part of the common electrode to make electrical contact therewith. Some of the leads which extend out of the chamber for connection with external circuitry are sandwiched between an insulator member and the wall and thereby insulated against electrical contact with either of the cup-shaped electrodes. The insulator member is integrally formed with the insulator wall by cutting a portion thereof away from the wall to form the electrode mounting hole and folding it to overlie the leads and the wall.
266500
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