JPS6348293Y2 - |
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| 申请号 | JP5293381 | 申请日 | 1981-04-13 | 公开(公告)号 | JPS6348293Y2 | 公开(公告)日 | 1988-12-13 |
| 申请人 | 发明人 | ||||||
| 摘要 | A light weight golf club shaft and a method of making it out of metal tubing are described. The metal must have, after heat treatment, a yield strength equal to or greater than 220,000 lbs./in.2 to avoid permanent shaft deflection in use. The metal must also have an ultimate strength equal to or greater than 240,000 lbs./in.2 to avoid shaft breakage in use. The finished shaft must attain the impact and permanent set results set forth in the specification. To fabricate the shaft in a variety of lengths and flex patterns needed to accommodate a golfer's individual needs, a collection of manufacturing specifications incorporating relationships between the working material, the initial size of the work piece, and the final shaft product length, taper, weight, and flex are presented. A test is defined for measuring the final shaft product's flex pattern. | ||||||
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