Method for roll forming and machine and blank for this
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United States of America Patent
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Oct 24, 2000
Grant Date -
N/A
app pub date -
Nov 20, 1998
filing date -
May 24, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method for the fabrication of cones of sheet material where the blank includes two curved edges that are circular and have the radius R and r respectively and a common center C. The blank further has two straight lateral edges which are angled in relation to the circular edges. An angle .alpha. between the radius, through a corner and a first straight edge is as great as an angle .beta. between the radius through a second straight edge. A frustum of a cone is obtained from the blank after rolling the cone such that the lateral edges have been united to make a joint that runs helically around the cone.
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