JP2000005349A - Golf club facilitating shaft exchange and angle adjustment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an individual to easily disassemble shaft and head, to assemble them again and to adjust a loft angle and a lie angle by his/her own hands. SOLUTION: A hosel joint 2 is fixed to the tip of a club shaft 1 by a means such as adhesion, etc., by an adhering face 3 to prevent both of them from being easily separated. The hosel joint 2 is worked to form a projecting taper surface 4. On the other hand, the hosel 6 of a club head 11 is worked to form a recessed taper surface 5. In addition, the axis of the club shaft hole of the hosel joint 2 and the axis of the surface 4 are made in a non-coaxial state, thereby the hosel joint 2 can be turned in the hosel 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a golf club head and a shaft, and more particularly to a joining method capable of easily attaching and detaching a golf club, and a joining method capable of easily changing a loft angle lie angle to some extent. To provide.

[0002]

2. Description of the Related Art A conventional method of joining a head and a shaft is as follows.
The head and shaft were directly fixed by inserting the shaft into a cylindrical hole formed in the hosel of the head and filling the gap between the hosel and the shaft with an adhesive such as epoxy resin.

[0003]

In order to remove the shaft from the head, the joint has been heated to soften the epoxy resin as an adhesive. Also, the loft angle is fixed and cannot be easily adjusted by individuals.

In recent years, the material of the shaft has changed from metal to carbon resin, and when the head and the shaft are separated by the above-mentioned heating method, the shaft is easily heated by heat compared to the metal shaft. Requires specialized skills, making it difficult for ordinary people to easily replace shafts.

Further, the fact that the replacement of the shaft has become difficult means that it has become difficult for the user to easily experience the combination of the shaft matched to his own swing and his favorite head.

[0006] Even if it is desired to adjust the loft angle by improving the golf skill of the player or by changing the player's preference for the ball line (flying ball trajectory), the adjustment of the loft angle should be performed by amateurs and professionals for the reasons described above. Even the situation is getting difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a head which the general public likes easily, easily and at low cost. It is an object of the present invention to provide a coupling method in which shafts can be exchanged and combined, and a coupling method in which a general person can easily adjust the loft angle lie angle to some extent.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the present invention relates to a coupling method, wherein a hole having a shape of a five concave taper surface is formed in a six hosel portion of an eleven club head, while a hole having a four convex taper surface is provided. The two hosel joints are tapered.

In the two hosel joints, a hole through which one club shaft can be pierced is formed coaxially or non-coaxially with the one club shaft. The one club shaft and the two hosel joints have three adhesive surfaces and are made of epoxy resin or the like. It is fixed with adhesive.

A female screw that engages with a 9-bolt is machined at the bottom of a 2-hosel joint having a 4-convex tapered surface. By tightening the 9-bolt, the tapered irregularities are strongly engaged and a strong connection is obtained.

[0011]

The taper connection is a connection method widely used as a method for attaching a cutting tool to a rotating shaft of a machine tool. For example, when a collet chuck of a drilling machine is mounted on a rotary shaft, or when a formed milling cutter is mounted on a rotary shaft of a milling machine, from these examples, taper bonding can be easily attached and detached and a strong coupling means. It can be understood that it is used.

The above-described taper joining method is used for joining the shaft and the head, and achieves both strong joining and easy separation.

By rotating one club shaft adhesively bonded to two hosel joints on the axis of the club shaft, the loft angle (the angle between the face of the head and the ground when the eight soles are installed on the ground) and the lie angle (The angle formed by one club shaft with the ground when the eight soles are in contact with the ground) can be changed. This is obtained because when one club shaft is rotated on its axis in a state where the five concave tapered surface and the four convex tapered surface are engaged with each other, the one club shaft performs a sliding motion.

[0014]

An embodiment will be described with reference to the drawings. FIG. 1 shows a cross section of one club shaft, two hosel joints, and six hosel portions of an eleven club head.

FIG. 1 shows a case where one club shaft and two hosel joints are laid out on the same axis, and FIG. 2 shows a case where one club shaft and two hosel joints are not laid out on the same axis. I have.

The two hosel joints and the one club shaft are bonded with a resin such as an epoxy resin on three bonding surfaces.

The 6 hosel portion of the 11 club head is formed with a tapered hole having a 5-concave tapered surface, so that the 4-convex tapered surface meshes exactly.

The 2 hosel joint is pulled into a 6 hosel tapered hole with 9 bolts having 10 washers.

Even if it is tightened with 9 bolts, it is processed so that there is a gap between the bottom dead center of the 2 hosel joint and the bottom of the 5 concave taper surface, and the 2 hosel joint and the 6 hosel do not come into contact. I have.

By setting the one club shaft and the two hosel joints on non-coaxial axes, the loft angle can be changed.

[Effects of the Invention] The present invention has the following effects because it is configured as described above.

Since a special skill such as heating is not required for separating the one club shaft and the eleven club head, the general user can easily separate the eleven club head and the one club shaft. In addition, if the 9-bolt tightening force is slightly loosened and the 2 hosel joint is rotated about the axis, even a layman can easily adjust the loft angle and the lie angle.

How to change the way the golf ball flies with the combination of the shaft and head that you like, and how to change the way the golf ball flies when you change the loft angle lie angle without purchasing a new golf club You can experience it to some extent, and you can improve your golf play skills at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a taper of a club head and a taper of a club shaft.

FIG. 2 is a cross-sectional view of a hosel joint in which the axis of one club shaft and the axis of a four-convex taper surface are not on the same line and are offset.

[Explanation of symbols]

 Reference Signs List 1 club shaft 2 hosel joint 3 adhesive surface 4 convex taper surface 5 concave taper surface 6 hosel 7 hosel joint bottom dead center 8 sole 9 port 10 washer 11 club head 12 club shaft hole 13 convex taper surface extension line 14 convex taper surface extension line Intersection point 15 Convex taper surface axis 16 Club shaft hole axis

Claims (5)

[Claims] 1. An 11 club head made of wood, iron or putter is formed with a tapered hole having 5 concave tapered surfaces in a 6 hosel portion of the 11 club head, and a 2 hosel joint having a 4 convex tapered surface which can be engaged with the hole is formed in one club. A golf club characterized by being joined to a shaft using an adhesive such as an epoxy resin, and connecting a 2 hosel joint and an 11 club head to a 1 club shaft and an 11 club head by fastening means such as 9 bolts. 2. The golf club according to claim 1, wherein the axes of the one club shaft and the two hosel joints are coaxial. 3. The golf club according to claim 1, wherein the axes of the one club shaft and the two hosel joints are not coaxial. 4. A taper value of a 4-convex taper surface and a 5-concave taper surface of a 2-hosel joint (Japanese Industrial Standard JIS-
A golf club characterized in that the Morse taper shown in B-4003 expresses a taper value of about 1/20) between 1/24 and 8/24. 5. A taper value according to claim 4, wherein a common taper value is established between a shaft maker, a head maker, a club maker, and other manufacturers involved in golf club production to thereby ensure compatibility between the head and the shaft. A golf club characterized by having it.