Forming bores in bendable layered materials
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United States of America Patent
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Apr 2, 1991
Grant Date -
N/A
app pub date -
Dec 11, 1989
filing date -
Dec 11, 1989
priority date (Note) -
Expired
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Abstract
A method of forming a circular opening in a layered sheet material to be subsequently bent which causes the layers to shift relative to one another in a direction normal to the bend including the steps of piercing the layers material with an oblong opening the spaced apart circular end configurations, then bending the layered material so that the opposite end portions in different layers are moved toward one another sufficiently so that a final circular opening is formed.
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