Graphite-steel golf club shaft

United States Patent Application 20050221910

A golf club shaft is designed to be strong, light-weighted and flexible and to fit individual custom needs. The shaft is made of both graphite and steel. The inner layer of the golf club shaft could be steel or graphite, outer layer of the golf club shaft also could be steel or graphite, any portion of the shaft could be made of steel only or graphite only, and/or the ratio to the graphite and steel could vary depending on the need of the golfers. Steel layer could be made of coiled steel wire springs.

Han, Don K. (La Canada, CA, US)

10/818048

10/06/2005

04/06/2004

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473/316

473/319

A63B53/10; A63B53/12; (IPC1-7): A63B53/10; A63B53/12

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BLAU, STEPHEN LUTHER

SonHwa Sohn, Esq. (Rancho Cucamonga, CA, US)

1. A golf club shaft, the improvement comprising: an inner layer, an outer layer, and means to connecting said inner layer and said outer layer.

2. The golf club shaft according to claim 1 wherein said inner layer is made of steel and said outer layer is made of graphite.

3. The golf club shaft according to claim 1 wherein said inner layer is made of graphite and said outer layer is made of steel.

4. The golf club shaft according to claim 1 wherein the connecting face of said inner layer has dents.

5. The golf club shaft according to claim 1 wherein said inner layer has holes.

6. The golf club shaft according to claim 1 wherein the connecting face of said outer layer has dents.

7. The golf club shaft according to claim 1 wherein said outer layer has holes.

8. The golf club shaft according to claim 1 wherein any part of said golf club shaft comprising said outer layer only.

FIELD OF THE INVENTION

The present invention relates to a golf club shaft. More specifically, it relates to an improved golf club shaft made of graphite and steel.

BACKGROUND OF THE INVENTION

Currently, the golf club shaft is mainly made of graphite or steel. Steel shaft is relatively inexpensive and strong but heavy and inflexible. Graphite shaft is light-weighted and flexible. To compensate the heavy weight and inflexibility of the steel shaft, the golf club shaft made of graphite and steel together is invented. By providing a graphite and steel golf club shaft, golfers can enjoy a strong, light-weighted, and flexible golf club shaft.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide golfers with a strong, light-weighted, and flexible golf club shaft. This objective can be accomplished by making the golf club shaft made of both graphite and steel. The steel portion of the present invention will make the golf club shaft strong and the graphite portion of the present invention will make the golf club shaft light-weighted and flexible.

Another objective of the present invention is to provide golfers with custom designed shaft to fit individual golfer's needs. Individual golfer might want a certain portion of the golf club shaft to be more flexible, heavier or stronger than the other portion of the golf club shaft. This objective can be accomplished by allocating more, less or no graphite or steel to the certain portion of the golf club shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plain view of a golf club shaft.

FIG. 2 is a vertical sectional view taken as on line 2-2 in FIG. 1.

FIG. 3 is a horizontal cross sectional view of a golf club shaft taken as on line 3-3 in FIG. 2.

FIG. 4 is a horizontal cross sectional view of a golf club shaft made according to claim 8 of the present invention.

FIG. 5 is a vertical sectional view of a golf club shaft made according to claim 4 of the present invention.

FIG. 6 is a horizontal cross sectional view of a golf club shaft made according to claim 4 of the present invention.

DETAILED DESCRIPTION

A golf club shaft 11 is consisted of two layers. One is an outer layer 12, and the other is an inner layer 13. A connecting face 15 of the inner layer is tightly connected to a connecting face 14 of the outer layer. Little dents 16 on the surface of the connecting face of the inner layer are created to reinforce tight connection between the two layers.