Ignition plug and method of manufacture
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 4, 2001
Grant Date -
N/A
app pub date -
Jan 11, 2000
filing date -
Jan 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Igniter and spark plugs according to the invention include a tubular insulator having an axially extending passage and axially opposed sealing shoulders within the passage spaced from the ends of the insulator. A multi-part electrode assembly is disposed within the insulator, including an upper electrode joined by resistance welding to a lower electrode. A heat-expandable sleeve is carried about the upper electrode and a lower end thereof confronts a compressible gasket and the upper sealing shoulder. An enlarged head of the lower electrode confronts a sealing gasket on the lower sealing shoulder. During resistance welding, the upper and lower electrodes are displaced toward one another causing the gaskets to be compressed against the sealing shoulders of the insulator to form a gas-tight seal therebetween.
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