Method of inspecting insulators to detect defects including...

Details Method of inspecting insulators to detect defects including... Method of inspecting insulators to detect defects including...

2005-06-21

2005-06-21

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Spark plug removed or tested in a test fixture

C324S536000

Reexamination Certificate

active

06909286

ABSTRACT:
A method of inspecting insulators such as spark plug insulators for defects, whereby a plurality of insulators are inspected concurrently by being disposed with a plurality of first electrodes engaged in respective apertures in the insulators, and with apertures formed in a second electrode being disposed to peripherally enclose respective insulators. With the insulators and electrodes set in a closed chamber under high air pressure, and high voltage applied between the first and second electrodes, any defect is detected based on a level of leakage current which then flows.

REFERENCES:
patent: 2175038 (1939-10-01), Soper
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patent: 2801384 (1957-07-01), Pierce
patent: 2913659 (1959-11-01), Whaley
patent: 3330718 (1967-07-01), James, Jr. et al.
patent: 3775686 (1973-11-01), Ganger et al.
patent: 5254954 (1993-10-01), Fujimoto et al.
patent: 6426626 (2002-07-01), Kravis

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