Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1992-04-24
1995-01-31
Nold, Charles R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
273 80R, 273 80B, 428 345, 428 363, 428902, 428 359, 428 364, 428 361, A63B 5310
Patent
active
053857674
ABSTRACT:
A golf club shaft comprising a mandrel with a tapered surface as its outer circumference which is wound with three layers of prepreg sheets of high-strength fiber impregnate with synthetic resin. The middle layer is also wound with a separate string member. The inner layer fibers and the separate string member are arranged in a criss-cross pattern running generally in the longitudinal axial direction of the shaft. However, the fibers which are part of the middle and outer layers run unidirectionally only in the longitudinal axial direction of the shaft. No fibers run in a circumferential direction. In addition, the fiber and matrix of the outer layer become transparent after curing. Thus, even when the shaft is shrunk toward the center, no zigzag or wrinkles are generated in the string member found between the middle and outer layers nor in the outer layer fibers themselves. Also, no zigzagging, wrinkling, sagging or whitening occurs in the transparent outer layer which allows the design pattern of the string member to be seen. This increases the strength of the shaft and sufficient clamping stress by taping is provided. Finally, the safety of the club shaft is increased because the outer layer prevents exposure of the fibers and string member which decreases the chance of breakage.
REFERENCES:
patent: 4023801 (1977-05-01), Van Auken
patent: 4119748 (1978-10-01), Verbauwhede
patent: 4135035 (1979-01-01), Branen et al.
patent: 4757997 (1988-07-01), Roy
patent: 5049422 (1991-09-01), Honma
Daiwa Golf Co., Ltd.
Nold Charles R.
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