Coil shaft and method for fabricating same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 27, 2004
Grant Date -
Dec 20, 2001
app pub date -
Mar 15, 2001
filing date -
Mar 31, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coil shaft or tube to be fitted into a flexible sleeve to serve as a flexible rotation transmission shaft, containing a partially coarsely wound coil shaft formed by winding around a core a plural number of unit wires which are arranged in intimately parallel relation with each other in the fashion of a single flat metal strip, and extracting a dummy wire afterwards from a resulting tightly wound coil shaft to form coarsely wound portions where helices of certain adjacent unit wires spaced apart in the axial direction and in certain portions of the coil shaft.
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