Method of Forming a Metal Sheet Blank
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United States of America Patent
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Issued Date -
Sep 25, 2008
app pub date -
Jan 28, 2005
filing date -
Jan 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of forming a metal sheet blank (7) by deep-drawing the sheet blank (7) so as to produce a deep-drawn pre-form (7) having a base portion (8) and a skirt portion (9) extending at substantially right angles therefrom. The height of the skirt portion (9) varies around the perimeter of the pre-form (7) so as to provide a skirt (9) having a curved edge course (10), and subsequently processing said curved edge (10) to obtain a curled or bent edge (10) having a curved course. The invention also relates to a tool (1,6) and an apparatus for forming a sheet blank and to a lid or container (7).
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