JP2002000771A - Golf club head - Google Patents

Abstract

(57) [Problem] To provide a golf club head capable of almost preventing shaft breakage at the upper end of a hosel and removal of the shaft from the hosel. SOLUTION: In a Gork club head in which a shaft is inserted into a cylindrical hosel hole provided at one end of the head, a storage chamber is formed at an upper end portion of an inner wall of the hosel hole, and an annular body is stored therein. At the same time, a tap groove close to the outer peripheral surface of the shaft is formed in a lower portion of the inner wall of the hosel hole adjacent to the storage chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a hosel portion of a golf club head.

[0002]

2. Description of the Related Art A golf club has a hosel provided at one end of the head, that is, an end on the heel side, and a shaft made of metal or a fiber reinforced resin using carbon fiber or the like is inserted into the hosel. When a ball is hit on the face of the head, an extremely large impact force, also called one ton, is applied to the head. Moreover, in recent years, an increase in the flight distance of a hit ball has been pursued, and the head speed has been increased by increasing the size of the head and increasing the length of the shaft, so that the impact force applied to the head when hitting the ball has been further increased. Further, in order to lower the center of gravity of the head, a hosel portion that normally protrudes long above the head tends to be shortened, and the overall length of the hosel tends to be shortened.

[0003] Under such circumstances, there is a concern that the load on the joint between the head and the shaft increases, and that troubles such as breakage of the hosel, breakage or detachment of the shaft increase. Conventionally, as a countermeasure for preventing such a trouble, a portion at the upper end of the inner wall of the hosel hole, which is in contact with the shaft, is chamfered or rounded. In addition, for example, as disclosed in Japanese Utility Model Publication No. Hei 6-52857, it is proposed to interpose an elastic material having been subjected to an adhesion enhancing treatment between an inner wall of a hosel hole and an outer peripheral surface of a shaft. Have been.

[0004]

In the conventional measures, damage to the hosel side has been considerably prevented. However, with respect to the breakage of the shaft, troubles still occur. Even
Further effective measures are desired. In particular, according to the analysis of the inventor, it has been confirmed that 90% of the shaft breakage occurs in the shaft portion in contact with the upper end of the hosel. Accordingly, the above-mentioned utility model publication, Japanese Utility Model Laid-Open No. 6-528
In the proposal of No. 57, since the elastic material disposed between the inner wall of the hosel hole and the shaft does not reach the upper end of the hosel, the impact at the time of hitting the ball is somewhat reduced, It is considered that the shaft cannot be prevented from being damaged. In view of the above circumstances, an object of the present invention is to provide a golf club head that can substantially prevent shaft breakage at the upper end of the hosel and removal of the shaft from the hosel.

[0005]

In order to achieve the above object, a golf club head according to the present invention has the following features.
As described in the above, in a Gork club head in which a shaft is inserted into a cylindrical hosel hole provided at one end of the head, a storage chamber is formed at an upper end portion of an inner wall of the hosel hole, and an annular body is formed therein. And a tap groove close to the outer peripheral surface of the shaft is formed in a lower portion of the inner wall of the hosel hole adjacent to the storage chamber.

A storage chamber is formed at the upper end of the inner wall of the hosel hole, and the annular body is housed in the storage chamber. The stress concentration at the time of hitting the ball in the shaft portion is reduced by the characteristics of the annular body. In addition, by engraving a tap groove having a function of increasing the bonding area of the adhesive filled between the shaft and the inner wall of the hosel hole, the cut portion is disposed below the storage chamber on the inner wall of the hosel hole. In addition, the sharp tip of the thread at the uppermost end of the tapped groove portion does not come into contact with the shaft during a golf swing, thereby avoiding stress concentration.

Further, in the golf club head according to the present invention, as described in claim 2, the storage chamber is formed such that a diameter of a circumscribed circle surrounding the storage chamber is larger than an inner diameter of the hosel hole. Since, a ring-shaped shelf is formed at the top of the hosel, and the ring-shaped body placed on this shelf is:
There is no downward displacement of the hosel due to aging of the club, etc., and it is always at the upper end of the hosel, so that stress concentration at that portion can be reduced. Further, by making the annular body a material softer than the shaft, the impact at the time of hitting can be absorbed and alleviated, and the concentration of stress generated on the shaft can be reliably prevented.

Further, in the golf club head according to the present invention, as described in claim 3, the height of the storage chamber and that of the annular body are set substantially equal to each other and set in the range of 1 to 10 mm. In any severe impact when hitting the ball, the hard upper end of the hosel does not directly contact the shaft, so that the shaft is effectively prevented from being damaged at the upper end of the hosel. Further, since the height of the storage chamber is extremely short with respect to the entire length of the inner wall of the hosel hole, a decrease in the direct bonding area between the hosel and the shaft is avoided, and the shaft is firmly joined to the hosel. I can do it.

Further, since the substantial inner diameter of the annular body is set to be equal to or smaller than the outer diameter of the shaft portion to be joined to the annular body, when the shaft is inserted into the hosel, Since the shaft is tightly inserted into the hole of the annular body placed on the formed annular shelf, the adhesive filled between the inner wall of the hosel hole and the outer peripheral surface of the shaft leaks from the upper end of the hosel. Without
Workability of club assembly is improved.

As the material of the annular body disposed in the storage chamber, hard rubber, engineering plastic, aluminum alloy, copper alloy, or the like is used. Particularly, a material having good adhesion with an epoxy or acrylic adhesive is used. preferable. Further, as the annular body, one having a hardness smaller than that of the shaft is selected.
For example, when the annular body is a metal, a metal material having a Vickers hardness (HB) of 120 or less is selected, and when the annular body is a rubber material, a material having a durometer hardness of A70 or more is selected. preferable.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a storage chamber formed at an upper portion of a hosel hole has a shape of an annular shelf whose upper and inner peripheral sides are entirely opened. The height of the storage room is 1
It is preferably set in the range of 10 to 10 mm, particularly 3 to 10 mm.
More preferably, it is set in the range of 5 mm. If the height of the storage room exceeds 10 mm, the length of the hosel below the storage room becomes shorter, and the range in which the shaft and the hosel directly adhere to each other is reduced, so that the shaft may not be firmly attached. . On the other hand, if the height of the storage chamber is less than 1 mm, the size of the annular body is insufficient, so that a sufficient buffering effect at the upper end of the hosel cannot be obtained. Furthermore,
The thickness of the inner wall of the hosel hole forming the outer peripheral surface of the storage chamber is preferably 0.5 mm or more from the viewpoint of strength.
If it is less than 0.5 mm, there is a concern that a hosel crack may occur at the upper end of the hosel due to repeated hitting.

The height of the annular body is preferably substantially the same as the height of the storage chamber in order to prevent the shaft from coming into contact with the upper end of the hosel in any impact when hitting a ball. The thickness of the annular body is preferably set in the range of 0.2 to 2 mm, and most preferably in the range of 0.5 to 1 mm. If it is less than 0.2 mm, the effect of buffering the impact at the time of hitting the ball is significantly reduced,
If it exceeds mm, the stability of the head posture during the club swing deteriorates. Further, it is desirable that a corner of a portion in contact with the shaft at the upper end of the inner peripheral surface of the annular body be chamfered or rounded in order to ease contact with the shaft when hitting a ball.

An embodiment according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a hosel 1 of a golf club head according to the present invention. At the upper end of the inner wall 3 of the hosel hole 2, an annular storage chamber 4 having an upper part and an inner peripheral part opened is formed. That is, the outer peripheral surface 5 of the storage chamber 4 is formed in a cylindrical surface having a height of 5 mm at a position retracted by 1 mm from the inner wall 3 of the hosel hole 2 in contact when the shaft 7 is inserted. Also, the bottom surface 6 of the storage room 4 is
It is formed in the shape of an annular shelf having a width of 1 mm.

At the lower portion of the inner wall 3 of the hosel hole 2 adjacent to the storage chamber 4, the top of the groove ridge is close to the outer peripheral surface of the shaft portion inserted when the shaft 7 is inserted into the hosel hole 2. The tap groove 8 is formed as described above. The range in which the tap groove 8 is carved is one of the entire length of the hosel hole inner wall 3.
The range of / 4 or more is preferable from the viewpoint of increasing the adhesion area effectively.

The interior of the storage chamber 4 has a height of 5 mm,
An annular body 9 having a rectangular cross section with a thickness of 1 mm and an outer diameter 2 mm larger than the inner diameter of the hosel hole 2 is mounted. The inner diameter of the annular body 9 is equal to or smaller than the outer diameter of a shaft portion joined to the inner peripheral surface of the annular body 9 when the shaft 7 is inserted into the hosel hole. The corner of the upper end of the inner peripheral surface of the annular body 9 which is in contact with the shaft has a small radius in order to ease the contact with the shaft when hitting. The annular body 9 is a hard rubber having a durometer hardness of A90.

Since the hosel 1 of the golf club head according to the present embodiment is configured as described above, the impact due to the hit ball is absorbed and reduced by the annular body 9, and the stress concentration of the shaft 7 at the upper end of the hosel is reduced. Moreover, since the formation of the tap groove 8 increases the bonding area, the bonding between the shaft 7 and the hosel 1 becomes extremely strong, and the durability of the golf club is improved.

When assembling the golf club, an adhesive is applied to the inner surface of the hosel hole 2 and the tip portion 10 of the shaft 7 to be joined to the inner surface, and then the tip portion 10 is pressed into the hosel hole 2. When inserted
Since the adhesive 11 does not leak from the upper end of the hosel, and the shaft 7 is less likely to be uneven (unintentional movement) until the adhesive 11 is hardened, the centering accuracy of the shaft 7 with respect to the hosel hole 2 is reduced. As a result, the shaft is less likely to break, and the adhesion between the inner wall 3 of the hosel hole 2 and the shaft 7 can be strengthened. In addition, since the shaft 7 is firmly supported by the annular body 9, the positioning by the temporary fixing of the shaft is ensured until the adhesive material 11 is hardened, and unnecessary rotation of the shaft 7 is prevented, so that the club manufacturing operation is performed. Becomes easier.

[0018]

In the golf club head according to the present invention, an annular storage chamber is formed at the upper end portion of the inner wall of the hosel hole, and an annular body made of a material having a lower hardness than the shaft is stored in the storage chamber. Therefore, even when the shaft is greatly bent at the time of hitting, the soft annular body is interposed between the hard hosel upper end and the shaft, so that the shaft does not directly contact the hosel upper end, and Is absorbed by the annular body, so that stress concentration at the upper end of the hosel of the shaft is prevented. In addition, a sharp threaded tap groove provided to increase the bonding area of the inner wall of the hosel hole is formed under the storage chamber below the upper end of the hosel, so that the shaft bends at the time of hitting to sharpen. It is possible to provide a golf club which is not bent on an appropriate thread, does not cause stress concentration, and has extremely excellent durability.

Further, when assembling the golf club, the annular member firmly fixes the shaft in the hosel hole, so that the shaft can be temporarily fixed to the hosel hole reliably, and the centering accuracy of the shaft insertion is improved. In addition to the improvement, the shading and rotation of the shaft are almost eliminated, the adhesion between the shaft and the inner wall of the hosel hole is improved, and the assembling work is also facilitated.

Further, since the annular body functions as a lid, the adhesive filled between the inner wall of the hosel hole and the shaft is prevented from leaking from the upper end of the hosel before curing, so that the adhesive strength is improved. In addition, the club manufacturing operation becomes easy.

Further, in the golf club head according to the present invention, the hosel and the shaft can be connected with each other by the effects of increasing the bonding area by the tap groove, fixing the shaft by the annular body, and preventing the leakage of the adhesive. The joining becomes extremely strong, and the shaft is effectively prevented from coming off.

[Brief description of the drawings]

FIG. 1 is a hosel sectional view of a head according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hosel 2 hosel hole 3 inner wall 4 storage room 5 outer peripheral surface 6 bottom surface 7 shaft 8 tap groove 9 annular body 10 tip portion 11 adhesive 12 hosel upper end

Claims (3)

[Claims] In a Gork club head in which a shaft is inserted into a cylindrical hosel hole provided at one end of a head, a storage chamber is formed at an upper end portion of an inner wall of the hosel hole, and an annular body is formed therein. A golf club head which is housed and has a tap groove formed in a lower portion of an inner wall of a hosel hole adjacent to the storage chamber, the tap groove being close to an outer peripheral surface of a shaft. 2. The storage chamber is formed such that the diameter of a circumscribed circle surrounding the storage chamber is larger than the inner diameter of the hosel hole, and the annular body is made of a material softer than a shaft. Golf club head. 3. The height of the storage chamber and the annular body are set substantially equal to each other and set within a range of 1 to 10 mm, and the substantial inner diameter of the annular body is the outer diameter of a shaft portion joined to the annular body. A golf club head which is set to be equal to or smaller than.