Method of attaching a self-piercing element in a panel and...

Details Method of attaching a self-piercing element in a panel and... Method of attaching a self-piercing element in a panel and...

2006-05-23

2006-05-23

Cozart, Jermie E. (Department: 3726)

Metal working

Method of mechanical manufacture

Assembling or joining

C029S505000, C029S509000, C029S525010, C029S525050, C029S798000, C029S283500, C029S432200, C072S358000, C072S372000, C072S379200, C072S464000

Reexamination Certificate

active

07047617

ABSTRACT:
A self-piercing element including a shank, a radial flange and a tubular barrel. The flange includes spaced concave surfaces and the annular bearing surface has an area at least four times the concave surfaces. The element is installed in a panel supported on a female die including a central die post, wherein the outer side wall is a frustoconical having an included angle between five and twelve degrees. During installation, the tubular barrel pierces an opening in the panel and the panel is drawn against the outer surface of the tubular barrel and the barrel is deformed into a U-shape. The flange is simultaneously received in the die cavity and the panel is incrementally deformed radially into the concave surfaces between the frustoconical side wall and the flange portion providing improved torque resistance.

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patent: 6546613 (2003-04-01), Donovan
patent: 325978 (1989-08-01), None

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