Method for manufacturing spark plug using bending process...

Details Method for manufacturing spark plug using bending process... Method for manufacturing spark plug using bending process...

2006-08-29

2006-08-29

Williams, Joseph (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C029S03300H

Reexamination Certificate

active

07097525

ABSTRACT:
A spark plug is provided after a provisional bending process, during which the earth electrode is provisionally bent at almost 90 degrees. The earth electrode, one of both ends is joined to a housing member, has first and second end-side surfaces located mutually back to back and a tip surface connecting both end-side surfaces. A noble metal chip is mounted on the first end-side surface. A bending punch is set, which has a first pressing surface to be fitted to the second end-side surface located and a second pressing surface to be fitted to a tip surface. The bending punch is first moved so that the second pressing surface comes in contact with the tip surface of the earth electrode, and then moved so that the first pressing surface presses the second end-side surface in the axial direction of the center electrode. Accordingly, a main bending process is performed.

REFERENCES:
patent: 2002/0034915 (2002-03-01), Nakatani
patent: 2004/0029480 (2004-02-01), Fujita et al.
patent: 2000-164320 (2000-06-01), None
patent: 2002-164149 (2002-06-01), None
patent: WO 200193389 (2001-12-01), None

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