Golf club shaft and process of preparing same
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United States of America Patent
Stats
-
Aug 1, 1995
Issued Date -
N/A
app pub date -
Aug 29, 1994
filing date -
Aug 31, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light weight golf club shaft is disclosed which has an average weight of not greater than 1.4 g per inch and which is composed of an inner tubular layer of a carbon fiber reinforced plastic having a fiber orientation angle of 40 to 50 degrees with respect to the longitudinal axis of the shaft and an outer tubular layer of a carbon fiber reinforced plastic provided around the inner layer and having a fiber orientation angle of 5 to 30 degrees. The inner layer is obtained from a prepreg sheet by a sheet winding method, while the outer layer is obtained from a roving carbon fibers by a filament winding method. The inner layer has been hardened before the winding of the roving. A reinforcing layer obtained from a prepreg and having a fiber orientation angle of 0 to 5 degrees is provided inside of the inner layer at the tip portion of the shaft.
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