公开(公告)号：EP0901402A4

公开(公告)日：2005-02-09

申请号：EP97926648

申请日：1997-05-22

申请人： FM PREC GOLF MFG CORP

发明人： BRALY JOSEPH M ,  BRALY WARREN K

IPC分类号： A63B53/00 ,  A63B53/12 ,  B01D5/00 ,  B21C37/16 ,  B21C37/18 ,  B21C37/20 ,  B21K17/00 ,  F26B25/00

CPC分类号： B21C37/202 ,  A63B53/12 ,  A63B60/06 ,  A63B60/08 ,  A63B60/10 ,  A63B60/48 ,  A63B2060/0081 ,  B01D5/0066 ,  B21C37/16 ,  B21C37/18 ,  B21K17/00 ,  F26B25/006

摘要： A tubular blank for producing golf club shafts comprises a butt section having a uniform cross-sectional configuration along its length, a tip section also having a uniform cross-sectional configuration along its length, and a tapered section interconnecting the butt and tip sections. Metallurgically formed rifling on the interior surface of the blank extends throughout the entirety of the butt, tip and tapered sections. The golf club shafts produced from these blanks have increased strength and stiffness which is a direct result of the interior rifling. A set of golf club shafts preferably is produced from a group of these tubular blanks with each blank of the group having the same length and the same natural frequency. Predetermined portions are then selectively removed from the tip and butt sections. The ultimately produced golf club shafts are frequency matched along a predetermined gradient and each shaft of the set has a predetermined stiffness distribution along its length directly related to the stiffness distribution of the other shafts of the set.

摘要翻译： 一种用于生产高尔夫球杆杆的管状坯件包括沿其长度具有均匀横截面构造的对接部分，还具有沿其长度具有均匀横截面构造的尖端部分和将对接部和顶端部分互连的锥形部分。 在坯料的内表面上的冶金成形的膛线延伸贯穿整个对接，尖端和锥形部分。 由这些坯料生产的高尔夫球杆杆具有增加的强度和刚度，这是内部膛线的直接结果。 一组高尔夫球杆轴优选地由一组这些管状坯料制成，其中组的每个坯料具有相同的长度和相同的固有频率。 然后从尖端和对接部选择性地去除预定部分。 最终生产的高尔夫球杆轴沿着预定的梯度频率匹配，并且该组的每个轴沿其长度具有与组的其它轴的刚度分布直接相关的预定刚度分布。