Method of installing self-attaching fastener and apparatus

Details Method of installing self-attaching fastener and apparatus Method of installing self-attaching fastener and apparatus

1990-02-26

1991-11-26

Echols, P. W.

Metal working

Method of mechanical manufacture

Assembling or joining

29798, 29509, 295252, B23P 1100

Patent

active

050672240

ABSTRACT:
An improved die member and method of attaching a self-piercing and riveting fastener to a panel wherein a slug pierced from the panel by the riveting fastener is securely staked in the barrel portion of the fastener during the installation of the fastener. The staking method includes driving a plurality of staking projections into said slug, thereby pinching said slug between the projections and a barrel side wall. This pinching action causes the slug to deform outwardly and lodge between the side walls of said fastener. The staking projections are preferably arranged around the perimeter of the die post, and in a most preferred embodiment, the projections have a canted side wall proximal the wall, forcing a portion of said slug toward the barrel side wall, when said slug is pinched between said canted side wall and a bottom wall of said fastener.

REFERENCES:
patent: 4064617 (1977-12-01), Oaks
patent: 4543701 (1985-10-01), Muller

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