JP2002052105A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club formed by fixing a thick grip to a slender shaft which facilitates the insertion of the grip and is easily manufactured. SOLUTION: This golf club is formed by disposing an expansion material of an unexpanded state to the outer peripheral surface of the shaft which is <18 mm in the external diameter AS at the butt end and the external diameter BS in the position of 200 mm from the butt end to the head side, respectively and is AS<BS, inserting the grip to this shaft and expanding the expansion material to fix the grip to the shaft. The external diameter AG at the butt end is 29 to 35 mm and the external diameter BG in the position of 200 mm from the butt end to the head side is 18.5 to 35 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club, and more particularly to a golf club in which a thick grip is fixed to a thin shaft in which a grip can be easily inserted and which is easy to manufacture.

[0002]

2. Description of the Related Art Conventionally, golf clubs having a thicker grip than normal golf clubs in order to stabilize the face angle at the time of hitting a ball are disclosed in Japanese Patent Laid-Open Nos. 5-92055 and 7-2.
No. 4093 and Japanese Patent Application Laid-Open No. 10-225541. These publications disclose a technique of manufacturing a golf club by inserting a thick grip into a shaft having a large outer diameter.

However, if the outer diameter of the shaft is increased as described above, in the case of a tapered shaft in which the outer diameter increases along the butt from the head side, the outer diameter at the end of the butt becomes extremely large. However, there is a problem that it becomes difficult to insert a grip having a relatively small inner diameter of the insertion port, and the workability is deteriorated.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a golf club in which a thick grip is fixed to a thin shaft which is easy to insert the grip and is easy to manufacture.

[0005]

According to the present invention SUMMARY OF], from the outer diameter A _S and the butt end of the butt end to the head side 200
mm, the outer diameter B _S is less than 18 mm, and an unexpanded inflatable material is disposed on the outer peripheral surface of the shaft in which A _S > B _S , and a grip is inserted into the shaft. the material is expanded to fix the grip to the shaft, an outer diameter a _G of the butt end 29～35Mm, outer diameter B _G position 200mm from the butt end to the head side 1
A golf club is provided that is between 8.5 and 35 mm.

According to the present invention, the golf club has a bending rigidity of 2 × 10 ⁷ to 1 × 10 ⁸ N · mm ² between the butt end and a position 200 mm from the butt end toward the head. Is provided.

Further, according to the present invention, there is provided the golf club, wherein the expanding material is a foam such as foamed rubber.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of the golf club of the present invention, and is a cross-sectional view of a grip portion of the golf club. A grip 2 made of rubber or the like is inserted into the butt side of the shaft 1 via an expansion material 3. As shown in FIG. 2, the shaft 1 has an outer diameter A _S at the butt end 4 and an outer diameter B _{S at} a position 200 mm from the butt end toward the head side, each having a small diameter of less than 18 mm. _S > B _S and is tapered.

Further, as shown in FIG. 3, an unexpanded inflatable material 3 is provided on the outer peripheral surface of the grip portion of the shaft 1, and the grip 2 is further inserted and, if necessary, placed in a mold. Then, the inflatable material 3 is expanded and
The grip 2 is fixed to the shaft 1 as shown in FIG.

The expansion material 3 is not particularly limited as long as it can expand and fix the grip 2 to the shaft 1.
A material that expands due to a chemical reaction, heat, or the like can be used. For example, a foam such as foamed rubber is preferably used. By using the foam, it is possible to reduce the weight of the golf club.

When the expansion material 3 is a thermal expansion material,
The expansion is performed by heating. In this case, the expansion is preferably performed at a temperature of 100 ° C. or less.
Preferably, it is a material that expands at a temperature of less than or equal to ° C. This is because when the resin is expanded at a temperature higher than 100 ° C., the resin of the shaft 1 itself is softened, and the strength of the shaft 1 may be reduced.

[0012] grip 2, 200 mm outer diameter is configured larger than that of the normal, outer diameter A _G of the butt end of the time fixed to the shaft 1 29～35Mm, from the butt end to the head side outer diameter B _G position of 18.5 to 35
mm. As described above, since the shaft 1 has a small diameter, as shown in FIG. 3, a gap is formed between the inflatable material 3 and the grip 2 before the inflatable material 3 expands.
It is extremely easy to insert the grip 2 into the shaft 1, and the workability is good.

On the other hand, if the shaft 1 has a large diameter, the outer diameter of the butt end 4 of the shaft 1 becomes large, and it becomes difficult to insert the grip 2. Further, the increase in the outer diameter of the shaft 1 increases the rigidity of the shaft itself, making it difficult for the shaft 1 to be liable to be deformed. Therefore, there is a problem that the head speed at the time of hitting the ball is reduced. Therefore, the outer diameter of the shaft 1 is reduced to less than 18 mm as described above.

As for the rigidity of the golf club, the grip 2
The bending stiffness between the end of the bat after mounting the butt and a position 200 mm from the butt end to the head side is 2 × 10 ⁷ to 1 × 1.
0 ⁸ N · mm ² , and 6 × 10 ⁷ to 1 × 10 ⁸ N · m
It is preferable to reduce the rigidity so as to obtain m ² . By setting the bending stiffness to 2 × 10 ⁷ N · mm ² or more, the face angle at the time of hitting the ball can be stabilized and 1 × 10 7
^By setting it to ⁸ N · mm ² or less, the head speed at the time of hitting the ball can be increased. As described above, since the outer diameter of the shaft 1 is as small as less than 18 mm, the rigidity can be easily reduced.

[0015]

EXAMPLES The present invention will be further described with reference to the following examples, but it goes without saying that the scope of the present invention is not limited to these examples.

The outer diameter A of the butt end 4 as shown in FIG.
_S is 16mm, 200mm from butt end 4 to head side
After applying a primer to the outer peripheral surface of the shaft 1 having the outer diameter B _S of 15 mm at the position of 15 mm where the grip 2 abuts, the unexpanded foamed silicone rubber (KE5
21, Shin-Etsu Chemical Co., Ltd.). After that, the grip 2 was inserted as shown in FIG. 3, but the insertion work was very easy because of the combination of the small-diameter shaft 1 and the large-diameter grip 2. Thereafter, the golf club was set in the mold. The expanded material 3 was allowed to stand as it was in order to chemically foam, and the golf club was removed from the mold after the completion of the foaming.

The outer diameter A _G of the butt end 4 of the obtained golf club is 31 mm, and 200 mm from the butt end 4 to the head side.
outer diameter B _G positions mm was 21 mm. About this golf club, when the bending rigidity between the butt end and the position of 200 mm from the butt end to the head side was measured,
Since it was 7 × 10 ⁷ to 8 × 10 ⁷ N · mm ² , a golf club having not too high rigidity and excellent flexibility was obtained.

[0018]

According to the present invention, by disposing an unexpanded inflatable material on the outer peripheral surface of a small diameter shaft, inserting a grip, inflating the inflatable material and fixing a thick grip to the shaft, A golf club that can be easily inserted with a grip and that is easy to manufacture can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a grip portion of a golf club.

FIG. 2 is a sectional view of a shaft.

FIG. 3 is a cross-sectional view of a grip portion showing a state where an inflation material is not expanded.

[Explanation of symbols]

 Reference Signs List 1 shaft 2 grip 3 inflatable material 4 butt end

Claims (4)

[Claims] The outer diameter A _S of the butt end and the outer diameter B _{S at} a position 200 mm from the butt end to the head side are each less than 18 mm, and the outer peripheral surface of the shaft where A _S > B _S is satisfied. disposed expansion material unexpanded state, to insert the grip to the shaft, said expanded material is expanded to secure the grip on the shaft, the outer diameter a _G of the butt end 29～35Mm, the butt end portion 200mm to head side
Golf club outside diameter B _G of the position of is 18.5~35mm. 2. The bending stiffness between the butt end and a position 200 mm from the butt end toward the head is 2 × 10 ⁷ -1.
The golf club according to claim 1, wherein the golf club has a size of × 10 ⁸ N · mm ² . 3. The golf club according to claim 1, wherein the expansion material is a foam. 4. The golf club according to claim 3, wherein the foam is a foamed rubber.