JPH0666723U - Golf club - Google Patents

Abstract

(57) [Summary] [Purpose] By providing flexibility at the connecting portion between the club head and the shaft, the flight distance of the hit ball is increased and the shaft is prevented from being broken. [Structure] A predetermined range of a tip end portion of a shaft to be inserted into a hosel 14 of a club head 12 is gradually reduced toward the end side, and a tapered portion 20 having a gradually reduced thickness is formed. Corresponding to the taper portion 20, the inner wall portion 24 of the hosel 14 that expands toward the opening and gradually becomes thin is connected. Therefore, at the moment of impact,
Flexibility is imparted to the hosel 14 and the club head 12 at the connecting portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a golf club having improved flexibility with respect to the shaft of the golf club.

[0002]

[Prior art]

 FIG. 5 shows a cross-sectional shape of a main part of the conventional golf club 2. This golf club 2 is composed of a club head 4 and a shaft 8 connected to a hosel 6 of the club head 4. A core material 5 made of foamed resin or the like is filled in the club head 4. When connecting the shaft 8 and the club head 4, the connecting portion of the shaft 8 to be inserted into the hosel 6 of the club head 4 is polished and, for example, an epoxy resin adhesive 9 is attached to the polished portion. The shaft 8 is inserted into the hosel 6 and firmly fixed by adhesion. The connecting portion of the hosel 6 into which the shaft 8 is inserted has a uniform thickness d.

[0003]

[Problems to be solved by the device]

 By the way, in the golf club 2 according to the conventional technique, the tip end side of the shaft 8 inserted into the hosel 6 is formed thicker by the thickness d of the hosel 6. Therefore, the golf club 2 has an inconvenience that the flight distance of a hit ball cannot be sufficiently extended because the connecting portion with the hosel 6 has no flexibility even if the shaft 8 itself has flexibility. . Further, the stress at the time of impact is concentrated on the end portion of the hosel 6, and the shaft 8 is broken.

On the other hand, in order to give flexibility to the connecting portion between the club head 4 and the shaft 8, the portion of the hosel 6 is shortened, or the portion of the hosel 6 is removed to fix the shaft 8 directly to the club head 4. It is possible to do it. However, at the time of impact, if the golf ball does not come into contact with the sweet spot of the club head 4, the club head 4 becomes unstable, or stress is applied to the end of the club head 4 for the same reason as above. Are concentrated, and the shaft 8 is broken, which causes inconvenience.

The present invention has been made in order to overcome the above-mentioned inconvenience, and it is possible to increase the flight distance of a hit ball by providing flexibility at the connecting portion between the club head and the shaft. In addition, it is an object of the present invention to provide a golf club in which stress is not concentrated on the connecting portion and the shaft is not broken.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a golf club having a shaft connected to a hosel of a club head, in which a predetermined range of a shaft tip portion inserted into the hosel is reduced in diameter toward the club head. In addition, the taper is formed so as to gradually become thinner, while the predetermined range of the hosel in contact with the outer peripheral surface of the predetermined range of the shaft tip is made to correspond to the taper, and the diameter is expanded toward the opening of the hosel. And is gradually thinned.

[0007]

[Action]

 In the golf club according to the present invention, the predetermined range of the shaft tip portion to be inserted into the hosel of the club head is formed in a taper shape which gradually becomes thin, and the outer peripheral surface of the shaft tip portion in the predetermined range contacts. A predetermined area of the hosel is directed toward the opening portion of the hosel, and the diameter thereof is enlarged and gradually reduced. Therefore, at the time of impact, the connecting part formed by the contact between the tip of the shaft and the enlarged hole is flexibly deformed like other parts of the shaft, and the restoring force of the connecting part makes it a golf ball. Sufficient power is given.

Furthermore, by forming the tip of the shaft in a tapered shape that gradually becomes thinner, the stress generated in the portion from the tip of the shaft to the vicinity of the connecting portion between the shaft and the hosel is substantially reduced. It will be constant. Therefore, stress is not concentrated in the vicinity of the connecting portion, and it is possible to prevent the shaft from being broken in the vicinity of the connecting portion.

[0009]

【Example】

 A golf club according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments.

In FIG. 1, reference numeral 10 indicates a golf club according to the present embodiment. The golf club 10 basically has a club head 12 having a face which is an impact surface with a golf ball, and And a shaft 16 connected to the club head 12 via a hosel 14 provided on the club head 12. A grip (not shown) is formed at one end of the shaft 16. The club head 12 is filled with a core material 17 made of foamed resin or the like.

As shown in FIG. 2, the tip of the shaft 16 inserted into the hole 18 of the hosel 14 of the club head 12 is tapered toward the club head 12 so that the diameter of the shaft 16 gradually decreases. The portion 20 is formed and directed toward the club head 12 so as to be gradually thinned. On the other hand, the surface of the hole 18 of the hosel 14 that contacts the tapered portion 20 of the shaft 16 corresponds to the inclined surface of the tapered portion 20, and the inner wall that expands in diameter toward the opening 22 of the hosel 14. The portion 24 is formed, and the inner wall portion 24 is gradually thinned toward the opening 22. In this case, the tip end of the shaft 16 having the taper portion 20 can be fixed in the hole 18 of the hosel 14 by attaching an adhesive 26 such as an epoxy resin to the taper portion 20. The thickest portion of the inner wall portion 24 of the hosel 14 formed by expanding the diameter is formed to have a thickness d, and the meat of the hosel 14 and the shaft 16 near the opening 22 of the hosel 14 is combined. The thickness is formed to a thickness d '. The thicknesses d and d'of the wall thickness are set to d≈d '.

The tapered portion 20 at the tip of the shaft may be formed in a tapered shape at the time of manufacturing the shaft 16, or in the case of a carbon shaft, grinding is performed before inserting the shaft 16 into the hosel 14 of the club head 12. You may process. As the material of the shaft 16, a carbon shaft having carbon fibers held by a thermosetting resin is suitable. The shaft 16 may contain, for example, boron, titanium, amorphous metal, Kevlar, Vectran, Tyranno, or the like.

The golf club 10 according to the present embodiment is basically constructed as described above. Next, the operation and effects thereof will be described.

FIG. 3 is a partial cross-sectional view showing the moment of impact when the face of the club head 12 contacts the tee-up golf ball 28, and FIG. 4 is a partial cross-sectional view showing the state after impact. is there.

After the golfer holds the grip of the golf club 10 and starts swinging from the takeback, the club head 12 comes into contact with the golf ball 28. At the moment of impact when the club head 12 hits the golf ball 28, as shown in FIG. 3, the shaft 16 bends due to the inertial force of the golf ball 28 and the tapered portion 20 formed at the tip of the shaft The connecting portion formed by joining the inner wall portion 24 of the hole portion 18 of the hosel 14 is curved. In this case, the tip portion of the shaft forming the tapered portion 20 is formed so as to gradually become thinner toward the tip portion. On the other hand, the hosel 14 into which the tip portion is inserted is directed toward the upper part of the shaft 16 and is gradually formed to be thin. Therefore, it can be considered that the shaft 16 has substantially the same elastic characteristics up to the tip thereof. Therefore, the same flexibility as when the hosel 14 is not used can be obtained. As a result, the golf ball 28 is given a force from the club head 12 and a restoring force of the flexible shaft 16 is added, so that the golf ball 28 is caused to fly sufficiently far by these forces. .

Further, since the shaft 16 on which the tapered portion 20 is formed is gradually thinned toward the tip portion, the impact is exerted on the range from the tip portion to the vicinity of the connecting portion between the hosel 14 and the shaft 16. The stress sometimes generated is dispersed and uniform, and the above-mentioned stress does not concentrate near the connecting portion. In particular, since excessive stress concentration does not occur on the shaft 16 near the opening 22 of the hosel 14, it is possible to prevent the shaft 16 from being broken from the connecting portion.

[0017]

[Effect of device]

 According to the golf club of the present invention, the following effects can be obtained.

That is, at the moment of impact, a tapered portion formed in a predetermined range of the tip end portion of the shaft, and a hole formed by expanding the diameter toward the opening portion of the hosel corresponding to the tapered portion. The shaft can be made flexible by making the thickness of the connecting portion that contacts the portion substantially uniform. As a result, the flight distance can be further increased when a golf ball is hit.

Furthermore, since stress generated at the time of impact is not concentrated near the connecting portion between the shaft and the hosel, breakage of the shaft near the connecting portion can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a golf club according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the golf club shown in FIG.

FIG. 3 is a cross-sectional view showing the moment of impact when the face of the club head hits the golf ball.

FIG. 4 is a cross-sectional view showing a state after the impact of FIG.

FIG. 5 is a cross-sectional view showing a conventional golf club.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Golf club 12 ... Club head 14 ... Hosel 16 ... Shaft 17 ... Core material 18 ... Hole 20 ... Taper 22 ... Opening 24 ... Inner wall 26 ... Adhesive 28 ... Golf ball

Claims (1)

[Scope of utility model registration request] 1. A golf club having a shaft connected to a hosel of a club head, wherein a predetermined range of a tip end portion of the shaft inserted into the hosel is tapered toward the club head and gradually becomes thinner On the other hand, the predetermined range of the hosel that comes into contact with the outer peripheral surface of the predetermined range of the shaft tip is made to correspond to the tapered shape, the diameter is increased toward the opening of the hosel, and the hosel is gradually thinned. A golf club characterized in that.