Method for manufacturing spark plug

Details Method for manufacturing spark plug Method for manufacturing spark plug

2010-02-09

2011-10-11

Patel, Nimeshkumar (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C445S001000

Reexamination Certificate

active

08033880

ABSTRACT:
A method for manufacturing a spark plug which includes: (a) preparing a metal shell; (b) preparing an insulator; (c) inserting the insulator in an insertion hole of the metal shell; (d) forming an intended crimping portion of the metal shell into a crimping portion; and (e) pressing a lower side portion of the metal shell closer to a position lower than the intended compressive deformation portion, and pressing the crimping portion of the metal shell in an axial direction to compressively deform the intended compressive deformation portion of the metal shell and thus seal a space between a stepped portion of the metal shell and a stepped portion of the insulator, wherein step (e) controls a pressing amount of a press in a constant value from the start of compressive deformation to the end thereof.

REFERENCES:
patent: 4871339 (1989-10-01), Sadegh
patent: 6538365 (2003-03-01), Nasu et al.
patent: 2002/0041135 (2002-04-01), Fukushima
patent: 2002/0193033 (2002-12-01), Nasu et al.
patent: 2007-141868 (2007-06-01), None

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