Method and apparatus for making nipple holes in a double-walled hollow wheel rim of a spoke wheel
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Apr 3, 1997
filing date -
Oct 5, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method of making nipple holes or similar holes in a double-walled wheel rim having an inner wall positioned radially inward and outside of that an outer wall. The holes are made by punching by means of a punching tool provided with a cutting edge whereby the cutting edge is moved successively through the outer wall and the inner wall of the wheel rim and a punch die supporting the inner wall. The invention encompasses also an apparatus for the application of this method.
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