JP2000185122A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club whose shaft can be securely connected to the head at the connecting part of the shaft and the head without concentration of stress on the shaft near the connecting part, making the connecting part lighter and less rigid. SOLUTION: The connecting part 6 of the shaft 2 and the head 4 of this golf club consists of a flexible area 8 which can be bent corresponding to the bending or torsion of the shaft when swung and a fixing area 10 which can firmly connect and fix the shaft to the head so that the shaft can be securely connected to the head at the connecting part 6 and the concentration of stress on the shaft near the connecting part can be prevented. The flexible area 8 is relatively thin or has relatively low rigidity, while the fixing area 10 is relatively thick or has relatively high rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to enable a shaft to be securely joined to a head at a joint between the shaft and the head, and to eliminate stress concentration on the shaft in a region near the joint. The present invention relates to a golf club which is capable of reducing the weight and reducing the rigidity of the joint.

[0002]

2. Description of the Related Art Conventionally, in order to securely join a shaft and a head, the joint between the shaft and the head has a relatively large thickness over most of the joint. As a result, the weight and rigidity are increased.

[0003]

However, in such a golf club in which the joint portion between the shaft and the head is made thicker and more rigid over a large part, for example, a large load is applied to the shaft during a swing. When
Stress concentrates on the shaft in the vicinity of the joint, and as a result, problems such as breakage or breakage of the shaft occur.

The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to securely join a shaft to a head at a joint between the shaft and the head, and to provide a joint between the shaft and the head. It is an object of the present invention to provide a golf club capable of eliminating stress concentration on a shaft in a region in the vicinity of a portion, and realizing a lightweight and low-rigidity joint portion.

[0005]

In order to achieve the above object, the present invention provides a golf club having a head provided at the tip of a shaft and a joint capable of joining the shaft to the head. In the club, the joint portion is a bending region configured to bendable in accordance with a bent state, a bent state, or a twisted state of the shaft, and a fixing region configured to be capable of firmly fixing the shaft to the head. And the thickness of the bent region is set to 1.0 mm or less over a range of 5 mm or more from the base end to the tip of the joint.

Further, the present invention provides a golf club having a head provided at the tip of a shaft and a joint capable of joining the shaft to the head, wherein the joint has a bent state and flexure of the shaft. A bending region configured to bendable in accordance with the state or the torsion state and a fixing region configured to be capable of firmly joining and fixing the shaft to the head are integrally formed. The rigidity is 40.000 kgf · mm over a range of 5 mm or more in length from the base end to the front end of the joint.
It is set to ² or less.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a golf club according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 (a). Note that FIG. 2A is a diagram corresponding to A in FIG.
It is sectional drawing which follows the -A line.

As shown in FIGS. 1 and 2A, the golf club according to the present embodiment has a shaft 2, a grip (not shown) provided at a base end of the shaft 2, and a tip of the shaft 2. And a joint (neck, hosel) 6 between the shaft 2 and the head 4.
In this case, the shaft 2 can be securely joined to the head 4, and stress concentration on the shaft 2 in a region near the joint 6 can be eliminated.
Moreover, it is configured for the purpose of reducing the weight and rigidity of the joint 6.

In order to achieve such an object, the joint portion 6 applied to the present embodiment is provided with a shaft 2 at the time of swing.
The bending region 8 configured to be bent in accordance with the bending state, the bending state, or the torsion state is integrated with the fixing region 10 configured so that the shaft 2 can be firmly joined and fixed to the head 4. In addition, a socket 12 is attached to the base end P1 of the joint 6.

The bending region 8 is made relatively thin or relatively low in rigidity so that it bends in accordance with the bent state, the bent state, or the twisted state of the shaft 2 during a swing.

When the bending area 8 is made thinner, the joint 6
The thickness of the bending region 8 is 1.0 mm or less and 0.3 mm or more (preferably, over a range D1 having a length of 5 mm or more (preferably, a length of 10 mm or more) from the base end P1 to the tip P2. Is preferably set to 0.9 mm or less and 0.3 mm or more). In this case, the bending area 8
May be configured to have a constant thickness in the range D1, or may be configured to change its thickness in a tapered shape toward the base end P1 of the joint 6 in the range D1. Further, when the thickness of the bending region 8 is reduced in this way, the absence of the socket 12 is better in appearance and lighter.

Alternatively, when the bending area 8 is made to have a low rigidity, a length of 5 mm from the base end P1 of the joining portion 6 toward the tip end P2.
mm (preferably 10 mm or more in length)
Over, the bending stiffness of the bending region 8 is 40.000 kg
It is preferably set to not more than f · mm ^{2 and not} less than 10.000 kgf · mm ² (preferably not more than 35,000 kgf · mm ^{2 and not} less than 10.000 kgf · mm ² ). In this case, the bending area 8 is located in the range D1.
The bending rigidity may be configured to be constant, or the bending rigidity may be gradually (continuously) reduced toward the base end P1 of the joint 6 in the range D1.

The fixing area 10 is relatively thick or fixed so that the shaft 2 is firmly joined and fixed to the head 4.
Relatively high rigidity.

When the thickness of the fixing region 10 is increased, the fixing region 10 is fixed over a range D2 of at least 8 mm or more (preferably, 12 mm or more) in contact with the joining region P3 with the crown portion 4a. It is preferable that the thickness of the region 10 be set to 1.1 mm or more.

Alternatively, when increasing the rigidity of the fixing region 10, at least a length D 8 mm or more (preferably a length 12 mm or more) in contact with the joining region of the joining portion 6 with the crown portion 4 a is required. The bending rigidity of the fixing region 10 is
45,000 kgf · mm ² or more (preferably 50.000 kgf · mm ²⁾
000 kgf · mm ² ).

In particular, FIG. 2 (a) shows, as an example, a thinned bent region 8 and a position limited to the inside of the crown portion 4a of the head 4 and made thicker than the bent region 8. The structure of the joint 6 including the fixed region 10 is shown.

According to such a configuration, for example, even when a large load is applied to the shaft 2 at the time of a swing, the bending region 8 of the joint portion 6 is adapted to the bending state, the bending state, or the twisting state of the shaft 2. Is smoothly bent, so that the shaft 2
It is possible to eliminate the concentration of stress on the substrate. As a result, problems such as breakage or breakage of the shaft 2 can be prevented.

Furthermore, since the shaft 2 can be firmly fixed to the head 4 by the fixing area 10 of the joint 6, even when a large load is applied to the shaft 2 during the swing as described above, the shaft 2 is always fixed. , It is possible to secure a stable swing.

Furthermore, the joint 6 of the present embodiment can be made relatively simple and thin overall, so that the weight of the golf club can be reduced.

In consideration of the elastic modulus, strength and specific gravity, the material of the joint is a titanium alloy (6Al-4V,
5Mo-5Zr-3Al, etc., pure titanium, an amorphous alloy (zirconium-based, etc.) are good, and are the same as or similar to the head 4 (for example, the head body is made of titanium alloy, and the joint is made of titanium alloy or pure titanium). It is better to By doing so, integral molding and welding can be performed, and at the same time, productivity is increased and strength is also increased. Also, residual stress due to thermal stress is reduced.

The configuration of the above-described first embodiment is merely an example, and various modifications can be made as follows.

As a first modified example, as shown in FIG. 2B, for example, as shown in FIG. 2B, a range D3 between the range D1 and the range D2 of the joint 6 (the range D1 excluding the range D1 in the bending region 8).
In 3), the thickness of the bending region 8 is adjusted to the base end P of the joint 6.
It may be changed in a tapered shape toward 1.

According to the first modification, the rigidity in the vicinity of the portion where the crown portion 4a and the joining portion 6 of the head 4 are integrally connected can be increased. Can be prevented beforehand.

The other configurations and effects are the same as those of the above-described embodiment, and therefore, are denoted by the same reference numerals and description thereof will be omitted.

As a second modification, for example, as shown in FIG.
In addition, the socket 12 may be protruded outward, and the socket 12 may be extended to the base end of the fixing region 10 so as to cover the bending region 8.

According to the second modified example, since the joint 6 protruding from the head 4 looks thicker in appearance, it is possible to realize a sense of security at the time of addressing, for example.

The other configurations and effects are the same as those of the above-described embodiment, and therefore, the same reference numerals are given and the description will be omitted.

As a third modified example, as shown in FIG. 3A, for example, the thickness of the fixing region 10 of the joint 6 is set to be the same as the thickness of the bent region 8 (thinning), and the fixing region 10 is fixed. 10 may be extended to the sole portion 4b of the head 4.

According to the third modification, the fixed region 10 is sandwiched and supported at both ends by the crown portion 4a and the sole portion 4b of the head 4, so that, for example, a large load is applied to the shaft 2 during a swing. Does not deform the fixed region 10. Therefore, even when the fixed region 10 is thinned like the bent region 8, the shaft 2 can be firmly joined and fixed to the head 4.

The fixed area 1 applied to the third modification example
0 corresponds to the fixed area 1 shown in FIGS.
It goes without saying that the same can be applied to 0.

The other configurations and effects are the same as those of the above-described embodiment, and therefore, are denoted by the same reference numerals and description thereof will be omitted.

As a fourth modified example, as shown in FIG. 3B, for example, the thickness of the fixing region 10 of the joint 6 is set to be the same as the thickness of the bent region 8 (thinning), and 6
(The end of the fixed area 10) may be supported by the support member 14. One end of the support member 14 is fixed to the distal end P2 of the joint portion 6 (the end of the fixing region 10), and the other end is fixed to the sole portion 4b of the head 4. In this case, the support member 14 has a relatively small diameter (for example,
Various shapes such as a columnar shape or a prismatic shape (outer diameter: 3.0 to 10.0 mm) can be applied.

According to the fourth modification, the fixed region 10 has one end supported by the sole portion 4b of the head 4 via the support member 14 and the other end supported by the crown portion 4a of the head 4. Therefore, even when a large load is applied to the shaft 2 during a swing, for example, the fixed region 10 is not deformed. Therefore, even when the fixed region 10 is thinned like the bent region 8, the shaft 2 can be firmly joined and fixed to the head 4. Further, the supporting member 14 is formed to have a relatively small diameter (for example, an outer diameter of 3.0 to 10.0).
mm), it is possible to further reduce the weight of the entire head 4, that is, further reduce the weight of the entire golf club.

Further, the supporting member 1 applied to the fourth modified example
4 has the fixed area 1 shown in FIGS. 2 (a) to 2 (c).
It goes without saying that the same can be applied to 0.

The other configurations and effects are the same as those of the above-described embodiment, and thus the same reference numerals are given and the description thereof will be omitted.

As a fifth modification, for example, FIG. 3C shows a structure of a joint 6 according to an improvement of the fourth modification. In the fifth modification, the joint 6
(The end of the fixed region 10) is supported by the heel portion 4c of the head 4 via the support member 16. One end of the support member 16 is fixed to the front end P2 of the joint 6 (the end of the fixing region 10), and the other end is fixed to the heel 4c of the head 4.

The structure of the supporting member 16 applied to the fifth modification can be similarly applied to the fixing region 10 shown in FIGS. 2 (a) to 2 (c). Needless to say. Further, the other end of the support member 16 may be fixed to, for example, the sole portion 4b or the face portion 4d (see FIG. 1) other than the heel portion 4c.

Other configurations and effects are the same as those of the fourth embodiment.
Therefore, the same reference numerals are given and the description thereof is omitted.

As a sixth modification, for example, as shown in FIG. 4A, the fixing region 10 of the joining portion 6 and the heel portion 4c of the head 4 may be integrated.

According to the sixth modification, the entire fixing region 10 is firmly supported by the heel portion 4c of the head 4, so that even when a large load is applied to the shaft 2 during a swing, for example, The fixed area 10 is not deformed. Therefore, the fixed region 1 facing the toe portion 4e side
The shaft 2 can be firmly joined and fixed to the head 4 even when the portion 0 is thinned like the bent region 8.

The fixed area 1 applied to the sixth modification example
0 corresponds to the fixed area 1 shown in FIGS.
It goes without saying that the same can be applied to 0.

Since other configurations and effects are the same as those of the above-described embodiment, the same reference numerals are given and the description is omitted.

As a seventh modification, as shown in FIG. 4B, for example, as shown in FIG. 4B, a range D3 between the range D1 and the range D2 of the joint 6 (the range D1 excluding the range D1 in the bent region 8).
In 3), a large-diameter portion 18 may be provided which tapers toward the base end P1 of the joining portion 6 and changes in a tapered shape. In this case, since the stress tends to concentrate near the portion where the large diameter portion 18 and the crown portion 4a of the head 4 are integrally connected, it is preferable to form the concave portion 20 near this portion. The typical dimensions are a length of 5 mm or more and a wall thickness of 0.
A thickness of 3 to 1.5 mm, more preferably a length of 8 mm or more, and a wall thickness of 0.3 to 0.9 mm is good. Further, the distal end P2 (the end of the fixed area 10) of the joint 6 may be supported by the support member 22. One end of the support member 22 has a tip P2 of the joint 6.
(The end of the fixing region 10), and the other end is fixed to the sole 4 b of the head 4. In this case, the support member 22 has a relatively small diameter (for example, an outer diameter of 3.0 to 10.
Various shapes such as a columnar shape (0 mm) or a prismatic shape can be applied.

According to the seventh modification, the provision of the large-diameter portion 18 makes it possible to improve, for example, ease of holding at the time of addressing, and forms the recess 20 in the large-diameter portion 18. By doing so, for example, even when a large load is applied to the shaft 2 during a swing, it is possible to eliminate stress concentration near the portion where the large diameter portion 18 and the crown portion 4a of the head 4 are integrally connected.

Further, the fixed region 10 has one end supported by the sole portion 4b of the head 4 via the support member 22 and the other end supported by the crown portion 4a of the head 4 (ie, at two locations). For example, even when a large load is applied to the shaft 2 during a swing, the fixed region 10 is not deformed. Therefore, even when the fixed region 10 is thinned like the bent region 8, the shaft 2 can be firmly joined and fixed to the head 4. Furthermore, since the support member 22 can be configured to have a relatively small diameter (for example, an outer diameter of 3.0 to 10.0 mm), the entire head 4 can be further reduced in weight, that is, the entire golf club can be further reduced in weight. It becomes possible. Also, the seventh
The configuration of the large diameter portion 18, the concave portion 20, and the support member 22 applied to the modified example can be similarly applied to the fixing region 10 shown in FIGS. 2 (a) to 2 (c). Needless to say.

Since other configurations and effects are the same as those of the above-described embodiment, the same reference numerals are given and the description is omitted.

As an eighth modification, for example, FIG. 4C shows a structure of a joint 6 according to an improvement of the seventh modification. In the eighth modification, the joint 6
(The end of the fixed region 10) is supported by the crown portion 4a and the heel portion 4c of the head 4 via two support members 24 and 26, respectively. Specifically, one end of one support member 24 is fixed to the tip P2 of the joint 6 (the end of the fixing region 10), and the other end is fixed to the crown 4a of the head 4. Also, the other support member 2
One end of the head 6 is fixed to the tip P2 (end of the fixing region 10) of the joining portion 6, and the other end is a heel portion 4c of the head 4.
It is fixed to.

According to the eighth modification, the fixed region 10 has one end (the tip P2 of the joining portion 6) having the crown portion 4a and the heel portion of the head 4 via the two support members 24 and 26. 4c, and the other end is supported by the crown 4a of the head 4. As a result, the fixing region 10 of the joint 6 is supported at three places, so that the fixing region 10 is not deformed even when a large load is applied to the shaft 2 during a swing, for example.
In addition, deformation of the head 4 at the time of hitting can be suppressed, and energy loss can be reduced.

Other configurations and effects are the same as those of the seventh embodiment.
Therefore, the same reference numerals are given and the description thereof is omitted.

The structure of the two support members 24 and 26 applied to the eighth modification can be similarly applied to the fixing area 10 shown in FIGS. 2 (a) to 2 (c). Needless to say,

Next, a golf club according to a second embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 5A, the golf club according to the present embodiment has a shaft 30, a grip (not shown) provided at a base end of the shaft 30, and a tip provided at the tip of the shaft 30. The head 30 can be securely joined to the head 32 at a joint (neck, hosel) 34 between the shaft 30 and the head 32, and in a region near the joint 34. It is possible to increase the amount of bending of the shaft 30 to a desired extent without causing stress concentration on the shaft 30, and to reduce the weight and rigidity of the joint 34. I have.

In order to achieve such an object, the joining portion 34 is accommodated and arranged inside the head 32 and the crown 32a of the head 32 has a shaft 3
No. 0 is formed, and an opening 36 is formed which can be joined to the joining portion 34 and can increase the bending amount of the shaft 30 joined to the joining portion 34 to a desired degree. Have been.

The joint 34 is connected to the shaft 30 at the time of swing.
A bending region 38 configured to be bendable in accordance with a bending state, a bending state, or a torsion state;
Is integrally formed with a fixing region 40 configured to be able to be fixedly joined and fixed to the head 32. Specifically, the fixed region 30 is attached to the sole portion 32b of the head 32.
Is fixed, and the bent region 38 is integrally and continuously arranged thereon.

The bending area 38 is formed by the shaft 3 during the swing.
It is relatively thin or has relatively low rigidity so as to bend in accordance with the zero bending state, the bending state, or the torsion state. In addition, the fixed area 40 includes the shaft 3
In order to firmly join and fix the head 0 to the head 32, it is made relatively thick or relatively rigid.

The configuration in the case where the bending region 38 is made thinner or less rigid and the configuration in the case where the fixing region 40 is made thicker or more rigid are described in the first embodiment.
Since the embodiment is the same as that of the first embodiment,
The description is omitted.

In particular, FIG. 5 (a) shows, as an example, the structure of the joint portion 34 composed of a thinned bent region 38 and a fixed region 40 which is thicker than the bent region 38. ing.

According to such a configuration, the amount of bending of the shaft 30 can be increased without causing stress concentration on the shaft 30 in the vicinity of the joint portion 34 (further increased compared to the first embodiment). ) Can be realized.

The flexible member 4 is formed in the opening 36 of the head 32.
By fitting 2, the amount of bending of the shaft 30 can be adjusted to a desired amount of bending according to the purpose of use of the club and the preference of the player. In this case, the flexible material 42
It is preferable to selectively use a material having sufficient flexibility as compared with the shaft 30 and the head 32, for example, rubber, foam, plastic, wood and the like.

The other effects are the same as those of the first embodiment, and the description is omitted.

The configuration of the above-described second embodiment is merely an example, and can be variously changed as follows.

As a first modification, for example, as shown in FIG. 5B, the fixing region 40 of the joining portion 34 and the heel portion 32c of the head 32 may be integrated.

According to the first modified example, since the entire fixing region 40 is firmly supported by the heel portion 32c of the head 32, for example, the shaft 30
The fixed region 40 is not deformed even when a large load is applied to the fixed region. Therefore, even when the portion of the fixing region 40 facing the toe portion 32d is thinned like the bent region 38, the shaft 30 can be firmly joined and fixed to the head 32.

As a second modification, for example, as shown in FIG. 5 (c), the fixing region 40 of the joint portion 34 is connected to the sole portion 32b and the heel portion 32c of the head 32 via two support members 44 and 46. You may comprise so that each may be supported. Specifically, one support member 44 has one end fixed to the end of the fixing region 40 and the other end fixed to the sole portion 32 b of the head 32. The other support member 46 has one end fixed to an end of the fixing region 40,
The other end is fixed to the heel portion 32c of the head 32.

According to the second modified example, the fixed region 40 has one end supported by the sole portion 32b and the heel portion 32c of the head 32 via the two support members 44 and 46, respectively. Other end (tip P of joint 34)
2) is supported by the sole portion 32b of the head 32. As a result, since the fixing region 40 of the joint portion 34 is supported at three places, even when a large load is applied to the shaft 30 during a swing, for example, the fixing region 40 does not deform. Therefore, even when the fixed region 40 is thinned like the bent region 38, the shaft 30 can be firmly joined and fixed to the head 32.
Further, the two support members 44 and 46 have a relatively small diameter (for example, an outer diameter of 3.0) as in the first embodiment described above.
(10.0 mm), the entire head 32 can be further reduced in weight, that is, the entire golf club can be further reduced in weight.

[0066]

According to the present invention, it is possible to securely join the shaft to the head at the joint between the shaft and the head, and to eliminate the concentration of stress on the shaft in the region near the joint. Can be provided, and a golf club in which the weight and the rigidity of the joint are reduced can be provided.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing an external configuration of a head applied to a first embodiment of the present invention, wherein FIG. 1A is a plan view seen from a face portion side, and FIG. The top view you saw,
(C) is the top view seen from the crown part side.

FIG. 2A is a diagram showing an internal configuration of a head applied to the first embodiment of the present invention, and FIG. 2B is a diagram showing the first embodiment of the present invention.
(C) showing an internal configuration of a head applied to the modified example of FIG.
FIG. 9 is a diagram showing an internal configuration of a head applied to a second modified example of the present invention.

3A is a diagram showing an internal configuration of a head applied to a third modification of the present invention, and FIG. 3B is a diagram showing an internal configuration of a head applied to a fourth modification of the present invention; FIG.
FIG. 14 is a diagram showing an internal configuration of a head applied to a fifth modification of the present invention.

FIG. 4A is a diagram showing an internal configuration of a head applied to a sixth modified example of the present invention, and FIG. 4B is a diagram showing an internal configuration of a head applied to a seventh modified example of the present invention. FIG.
FIG. 18 is a diagram showing an internal configuration of a head applied to an eighth modification of the present invention.

FIG. 5A is a diagram showing an internal configuration of a head applied to a second embodiment of the present invention, and FIG.
(C) showing an internal configuration of a head applied to the modified example of FIG.
FIG. 9 is a diagram showing an internal configuration of a head applied to a second modified example of the present invention.

[Explanation of symbols]

 2 Shaft 4 Head 6 Joint 8 Bending area 10 Fixed area

Claims (4)

[Claims] 1. A golf club having a head provided at a tip of a shaft and a joint capable of joining the shaft to the head, wherein the joint is in a bent state, a bent state, or a twisted state of the shaft. Is formed integrally with a bending area configured to be able to bend in accordance with the above, and a fixing area configured so that the shaft can be firmly bonded and fixed to the head. A golf club characterized by being set to 1.0 mm or less over a range of 5 mm or more in length from the base end to the tip of the portion. 2. A golf club comprising: a head provided at a tip of a shaft; and a joining portion capable of joining the shaft to the head, wherein the joining portion is in a bent state, a bent state, or a twisted state of the shaft. Is formed integrally with a bending area configured to be able to bend in accordance with the above, and a fixed area configured so that the shaft can be firmly joined and fixed to the head. 400.000kgf over a range of length 5mm or more from the base end to the tip of the part
Golf club, characterized in that · mm ² are set to be equal to or less than. 3. The thickness of the fixing region is set to 1.1 mm or more over a range of at least 8 mm or more in contact with the bonding region with the crown portion or the bonding region with the sole portion. The golf club according to claim 1, wherein: 4. The golf club according to claim 1, wherein the fixing region is supported at at least two places.