Ionization chamber assembly. [smoke detector]

Patent · Tue Feb 21 04:00:00 EST 1978

OSTI ID:6680827

Larsen, L D

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 at least one 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 are described. Minimizing leakage current-increasing factors such 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. 56 claims, 7 figures.

• Assignee: Patent Development and Management Co.
• Patent Number(s): US 4075487
• OSTI ID: 6680827
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AEROSOLS
ALARM SYSTEMS
COLLOIDS
CONDUCTOR DEVICES
CONNECTORS
DESIGN
DISPERSIONS
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRODES
EQUIPMENT
IONIZATION CHAMBERS
MEASURING INSTRUMENTS
RADIATION DETECTORS
RESIDUES
SMOKES
SOLS