JP4154507B2 - Golf club and shaft fixing method of the golf club - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to a golf club and shaft fixing method of the golf club with a new structure for fixing the shaft tip hosel provided on the head body.
[0002]
[Prior art]
In the conventional golf club, the shaft is attached by inserting the tip of the shaft into a hole of a hosel provided in the head body and fixing it with an adhesive. In addition, a ferrule is fixed to the shaft, and the bottom surface of the ferrule is brought into contact with the upper end surface of the hosel so that there is no step in the connecting portion between the shaft and the hosel, and the appearance is hidden so that the connecting portion is hidden. I was trying to improve.
[0003]
[Problems to be solved by the invention]
In the conventional shaft fixing method, since air is entrained when the shaft is inserted into the hole of the hosel, a gap is easily formed between the bottom surface of the ferrule and the upper end surface of the hosel, and the adhesive overflows above the hole. There was also. In order to make the hosel and the ferrule intimately contact each other, it is necessary to temporarily fix the hosel and the ferrule by, for example, winding an adhesive tape until the adhesive is cured. Further, if the temporarily fixed state is poor, there is a risk of reducing the adhesive strength of the adhesive. Thus, conventionally, there has been a risk of hosel and ferrule dirt and adhesive strength reduction due to the trouble of winding the tape and the protruding adhesive.
[0004]
Accordingly, the present invention provides a golf club having a novel shaft mounting structure that prevents the adhesive from protruding from the hosel and a decrease in adhesive force, and eliminates the trouble of winding the tape, and a method for fixing the shaft of the golf club. For the purpose.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a golf club in which a shaft tip is fixed to a hole of a hosel provided in a head body with an adhesive, and a ferrule made of a synthetic resin is fixed to the shaft tip side. It consists of a main body part located outside and a cylindrical part inserted into the hole of the hosel. A female thread is formed on at least the upper inner peripheral surface of the hosel hole, and the outer peripheral part of the cylindrical part of the ferrule is scraped off the female thread. The bottom surface of the main body of the screwed ferrule is brought into contact with the upper end surface of the hosel, and the hole of the hosel is formed so that the diameter of the portion where the cylindrical portion of the ferrule is inserted is larger than the diameter of the portion where the shaft tip is inserted, The upper end side of the hole is formed as a mortar-shaped portion with a diameter increasing toward the upper end, and the tip of the shaft is also formed below the female screw formed in the hole of the hosel. Flip not to be fitted, in which the adhesive is smaller than the diameter of the point of the upper inner peripheral surface of the female screw of the female screw portion or uneven portion for preventing protrude to the outside from the hole. Further, in a golf club shaft fixing method in which a shaft tip is fixed to a hosel hole provided in a head body with an adhesive, a synthetic resin comprising a main body portion located outside the hosel and a cylindrical portion inserted into the hosel hole. A ferrule made of steel is prepared, and a female screw portion or an uneven portion having a diameter smaller than that of the female screw is formed below the female screw formed on the upper inner peripheral surface of the hosel, and the upper end side of the hole of the hosel is directed to the upper end. The diameter of the ferrule is increased, the adhesive is applied to the outer periphery of the tip of the shaft and the inner peripheral surface of the hole, and the shaft of the ferrule is inserted while rotating into the hole of the hosel. The screw is fitted in a scraped form to prevent the adhesive from protruding to the outside at the female threaded portion or uneven portion below the hole, and the diameter is increased toward the upper end on the upper end side of the hole. It is obtained by preventing the leakage from the pot-shaped portion to the outside of the adhesive.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0007]
In the embodiment shown in FIG. 1, a cross-section in the middle of inserting the shaft 1 into the hole 3 of the hosel 2 is shown, and a ferrule 4 made of synthetic resin is fixed to the tip side of the shaft 1. It consists of a main body portion 4A located outside the hosel 2 and a cylindrical body portion 4B inserted into the hole 3 of the hosel 2. The ferrule 4 is made of cellulose plastic. Usually, the hosel 2 is integrally formed with a head body having a hitting surface (not shown). A female screw 3A is formed on the upper inner peripheral surface of the hole 3 of the hosel 2, and a female screw portion (or uneven portion) 3B is also formed below the female screw 3A. The cylindrical portion 4B of the ferrule 4 is screwed into the female screw 3A, and the bottom surface 4C of the main body portion 4A of the ferrule 4 is brought into contact with the upper end surface of the hosel 2. By inserting the shaft 1 into the hole 3 of the hosel 2 while rotating it, the relatively soft synthetic resin cylindrical body portion 4B of the ferrule 4 is screwed in such a manner that it is scraped off by the female screw 3A. When the shaft 1 (or the head body side) is rotated and inserted into the hole 3 of the hosel 2, an adhesive is applied to the outer periphery of the tip portion of the shaft 1 and the inner peripheral surface of the hole 3. In addition, the upper end side of the hole 3 of the hosel 2 is formed in a mortar-shaped portion 5 whose diameter increases toward the upper end.
[0008]
FIG. 2 shows a cross section of the hosel 2, in which the diameter of the portion where the female screw 3A is formed is larger than the diameter of the portion where the female screw portion 3B is formed. That is, the hole 3 of the hosel 2 has a two-stage configuration with different diameters. The female thread portion 3B is not for screw fitting with the tip of the shaft 1 and is for preventing the adhesive from protruding outside from the hole 3, and not the female thread portion 3B as in this embodiment. It may be. The reason why the diameter of the female screw 3A is made larger than the diameter of the female screw 3B is that the thickness of the cylindrical part 4B of the ferrule 4 is taken into consideration. The taper angle of the mortar-shaped portion 5 is preferably in the range of 30 ° to 80 °. By providing this mortar-shaped part 5, even if an adhesive protrudes, it does not leak outside from this part. The outer diameter of the bottom surface 4C of the main body portion 4A of the ferrule 4 is formed to be equal to the outer diameter of the hosel 2, and when the bottom surface 4C is in close contact with the upper end surface of the hosel 2, there is a step at the connecting portion between the shaft 1 and the hosel 2. In addition, the appearance of the connecting portion is improved.
[0009]
FIG. 3 is a diagram showing the shaft 1 and the ferrule 4, and the main body portion 4 </ b> A of the ferrule 4 is formed in a tapered shape in which the thickness gradually decreases toward the proximal side of the shaft 1. The length of the cylindrical portion 4B of the ferrule 4 is preferably at least 2 mm and less than 10 mm. In particular, 2 mm to 8 mm or less is preferable. If it is shorter than 2 mm, it is difficult to screw, and if it is 10 mm or more, the adhesion length is shortened and the hosel length must be increased. In the case of a putter, it may be 2 mm, and in the case of an iron, a longer one is better. Moreover, the thickness of this cylinder part 4B is about 0.2-0.8 mm. In addition, you may form the external thread which matches the internal thread 3A previously in the outer periphery of this cylinder part 4B. In addition, it is preferable that the front-end | tip of the cylinder part 4B is made to be sharp by chamfering the outer periphery so that it may insert in the hole 3 easily.
[0010]
An example in which the shaft 1, the ferrule 4, and the hosel 2 as described above are applied to a forged iron head will be described below. A hole 3 having a hole diameter of 9.6 mm and a depth of 35 mm is formed in the hosel 2 integrally formed with the iron head body, and a hole having a hole diameter of 10.3 mm is processed to a depth of 6.5 mm on the upper end side of the hole 3. A mortar-shaped portion 5 having an inclination of 60 ° was formed at the uppermost end. The female screw 3A and the female screw part 3B were processed with an M11 × 1.5 right screw. The insertion allowance at the tip of the shaft 1 was 33 mm. The tip diameter of the shaft 1 was 9.4 mm, the length of the cylindrical portion 4B of the ferrule 4 was 6 mm, and the thickness was 0.4 mm. Adhesive is applied to the tip of the shaft 1 and fixed with a vise, adhesive is also applied to the inner peripheral surface of the hole 3, the tip of the shaft 1 is inserted into the hole 3, and the head is centered on the axis of the shaft 1. While rotating the main body side, the bottom surface 4C of the ferrule 4 was inserted until it contacted the upper end surface of the hosel 2. At this time, the resin cylindrical body portion 4B is inserted into the hole 3 while being grooved in accordance with the spiral shape of the female screw 3A. After the insertion, the cylindrical portion 4B serves as a male screw and is screwed into the female screw 3A so that the shafts 1 and hosel 2 are aligned with each other. After contact, the adhesive was allowed to harden without temporary fixing such as tape winding as in the prior art. When the shaft 1 is fixed to the hosel 2 in this way, the shaft 1 is not inclined or biased with respect to the hole 3, and no adhesive sticks out, and the bottom surface 4C of the ferrule 4 and the hosel 2 No gap was formed between the upper end surface of each other.
[0011]
The mortar-shaped portion 5 has a function of pooling at this place even if the adhesive protrudes, and also has a function of relaxing stress concentration at the time of impact when a ball is hit with the head body. In order to fulfill the stress concentration relaxation function, the taper angle is preferably 30 ° to 80 °, particularly preferably 60 ° to 45 °. If the taper angle is less than 30 °, stress tends to concentrate at the contact point between the shaft 1 and the hole 3, and if the taper angle is greater than 80 °, the shaft 1 and the upper end corner of the hole 3 are easily contacted. Stress concentration occurs.
[0012]
The fixing means for the shaft 1 as described above can be applied to any golf club such as an iron, wood, or putter.
[0013]
【The invention's effect】
As described above, according to the present invention, in the golf club in which the shaft tip is fixed to the hole of the hosel provided in the head body with the adhesive, and the synthetic resin ferrule is fixed to the shaft tip side, the ferrule is the hosel. It consists of a main body part located outside and a cylindrical part inserted into the hole of the hosel. A female thread is formed on at least the upper inner peripheral surface of the hosel hole, and the outer peripheral part of the cylindrical part of the ferrule is scraped off the female thread. The bottom surface of the main body of the screwed ferrule is brought into contact with the upper end surface of the hosel, and the hole of the hosel is formed so that the diameter of the portion where the cylindrical portion of the ferrule is inserted is larger than the diameter of the portion where the shaft tip is inserted, The upper end side of the hole is formed as a mortar-shaped portion with a diameter increasing toward the upper end, and the tip of the shaft is also formed below the female screw formed in the hole of the hosel. Flip not to be fitted, the adhesive is smaller than the diameter of the point of the upper inner peripheral surface of the female screw of the female screw portion or uneven portion for preventing protrude to the outside from the hole, the adhesive as in the prior art There is no need for temporary fixing such as tape winding between the hosel and the ferrule until the agent is dry, and no adhesive protrudes and no gap is formed between the ferrule and the hosel. Further, since the cylindrical body portion of the ferrule is screwed into the hosel, the shaft axis and the hosel axis do not shift. In addition, the hole of the hosel is formed so that the diameter of the portion where the ferrule cylindrical portion is inserted is larger than the diameter of the portion where the shaft tip is inserted, so that the screw fitting of the ferrule cylindrical portion to the female screw is easy. It becomes. In addition, since the cylindrical body portion is inserted into the hole, if the hole on the hosel has a step larger than the hole below, the threaded fitting of the cylindrical body portion is facilitated and the protrusion of the adhesive is further increased. It can be prevented. In addition, by forming a female threaded part or uneven part below the female thread in which the cylindrical part is screwed, this female threaded part or uneven part prevents the adhesive from protruding even if air is caught when the shaft is inserted. Has the function of Further, in the case where a mortar-like portion is formed on the upper end side of the hole, the adhesive does not protrude beyond this point, and stress concentration on the shaft at the time of impact can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the middle of inserting a shaft into a hosel.
FIG. 2 is a cross-sectional view of a hosel.
FIG. 3 is a cross-sectional view of a shaft and a ferrule.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft 2 Hosel 3 Hole 3A Female thread 4 Ferrule 4A Body part 4B Cylindrical part 4C Bottom face 5 Mortar-shaped part

Claims (3)

In a golf club in which the shaft tip is fixed to the hole of the hosel provided in the head body with an adhesive, and a synthetic resin ferrule is fixed to the shaft tip side.
This ferrule consists of a body part located outside the hosel and a cylindrical part inserted into the hole of the hosel,
Forming an internal thread on at least the upper inner peripheral surface of the hosel hole;
The main body bottom surface of the screwed ferrule is brought into contact with the upper end surface of the hosel while scraping the outer periphery of the cylindrical body portion of the ferrule to the female screw,
The hole of the hosel is formed in a mortar shape in which the diameter of the portion into which the ferrule tube is inserted is larger than the diameter of the portion into which the shaft tip is inserted, and the upper end side of the hole is increased in diameter toward the upper end. Formed in the part,
Also below the female thread formed in the hole of the hosel, there is no threaded engagement with the tip of the shaft, and there is a female threaded part or uneven part to prevent the adhesive from protruding outside from the hole. A golf club characterized in that it is formed to be smaller than the diameter of the female screw on the surface.   2. The golf club according to claim 1, wherein the length of the cylindrical portion of the ferrule is 2 mm to 10 mm. In the method of fixing the shaft of a golf club in which the tip of the shaft is fixed to the hole of the hosel provided in the head body with an adhesive.
Prepare a ferrule made of synthetic resin consisting of a body part located outside the hosel and a cylindrical part inserted into the hole of the hosel,
A female screw portion or an uneven portion having a diameter smaller than that of the female screw is formed below the female screw formed on the upper inner peripheral surface of the hosel, and the diameter is increased with the upper end side of the hosel hole facing the upper end. ,
Applying adhesive to the outer periphery of the tip of the shaft and the inner peripheral surface of the hole, and inserting the shaft while rotating the shaft into the hole of the hosel, the screw part is screwed in such a way that the cylindrical part of the ferrule is scraped off by the female thread. ,
Preventing the adhesive from protruding to the outside at the internal threaded part or uneven part below the hole, and preventing leakage of the adhesive from the mortar-shaped part whose diameter increases toward the upper end on the upper end side of the hole A method for fixing a shaft of a golf club characterized by the above.

Images