Die for driving pierce nut

Details Die for driving pierce nut Die for driving pierce nut

1994-05-16

1995-08-29

Hughes, Tom

Metal working

Means to assemble or disassemble

Means to drive self-piercing work part

29243517, 294322, 83146, 83690, B23P 1900, B21D 2834

Patent

active

054449081

ABSTRACT:
A die assembly for driving a pierce nut which comprises an annular coining portion provided on the top of a die body, the inner surface of the annular coining portion being continuous with a center aperture of the die body. An annular projection is provided at the upper portion of the center aperture for surely and temporarily holding punched debris in of the die body, near the annular coining portion, the center aperture. It is therefore possible to provide an inexpensive nut-driving die assembly with improved durability, and which can prevent debris, punched by shearing between a pierce nut and a metal panel and remaining at the upper portion of the center aperture, from being lifted up when the metal panel is lifted from the die body, thereby ensuring a continuous driving work.

REFERENCES:
patent: 3253631 (1966-05-01), Reusser
patent: 3766628 (1973-10-01), Grube
patent: 3921276 (1975-11-01), Oaks
patent: 4064617 (1977-12-01), Oaks
patent: 4516450 (1985-05-01), Shuttleworth
patent: 4711021 (1987-12-01), Muller
patent: 5146672 (1992-09-01), Muller
patent: 5174018 (1992-12-01), Muller
patent: 5340251 (1994-08-01), Takahashi et al.

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