JPH10225537A - Golf club shaft set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club shaft set composed of a plurality of golf club shafts having different lengths in accordance with their numbers, and giving functions required in accordance with their numbers, and having satisfactory hitting feelings and long carries of a ball in accordance with their numbers. SOLUTION: An intermediate range B of a shaft, that is, between a front end range A in which a head is fitted, and a rear end range C in which a grip is fitted has a distance which is longer as the length of the shaft is longer. Further, the slope having a gradient which indicates a relationship between a distance from the front end of the shaft to a predetermined position in the intermediate range B and a bending rigidity at that position becomes smaller as the length of the shaft is longer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club shaft set comprising a plurality of golf club shafts, wherein the length of each shaft is changed according to the club number.

[0002]

2. Description of the Related Art In a golf club, as shown in FIG. 5, a head, which is a heavy material, is mounted on the tip of a hollow shaft.
A grip is attached to the rear end. As a golf club shaft, a shaft made of fiber reinforced resin (FRP) using carbon fiber or the like as a reinforcing fiber has recently been favorably used instead of a metal shaft made of steel or the like.

[0003] In terms of the shape of an FRP shaft, when a club head is mounted on the shaft, the tip of the shaft is inserted into a hole provided in a hosel extending in an L shape from the head body of the club head, and an adhesive is formed. Is used to fix the shaft and the head, so that the distal end region of the shaft where the head is mounted is usually formed in a cylindrical shape having the same diameter and extending in the longitudinal direction. The intermediate region following the front end region has a truncated cone shape whose outer diameter increases from the front end side to the rear end side with a gradient of about 7/1000. The rear end region to which the grip is attached is formed in a truncated conical shape that is continuous from the intermediate region, or is formed in a cylindrical shape that extends in the longitudinal direction with the same diameter as the outer diameter of the rear end position of the intermediate region.

On the other hand, when the shaft is viewed through a set of golf clubs, FIG. 6 shows an example of an iron club shaft set of No. 3 to No. 9 in which the rear end region of the shaft to which the grip is attached is formed in a cylindrical shape, for example. As shown in the relationship diagram between the distance from the shaft tip at a predetermined position of the shaft and the outer diameter of the shaft at that position, usually, a plurality of identical shafts are prepared, and the cylindrical tip region A is the longest 3 iron. 0.5 inch from (# 3) (12.
7 mm), the shafts from the 3rd iron (# 3) to the shortest 9th iron (# 9) are manufactured. Therefore, the lengths of the intermediate region B and the rear end region C are the same from the third iron to the ninth iron. Further, in the club shaft set, as shown in FIG. 7, the inclination of the gradient indicating the relationship between the distance from the shaft tip at a predetermined position of the intermediate region B and the bending rigidity of the shaft at that position depends on the club number. The same is true.

[0005]

In the iron club set, the loft angle of the club head is usually 4 degrees while the angle from 22 degrees of 3rd iron to 46 degrees of 9th iron.
° Set in increments. Similarly, the pitching wedge, the pitching sand and the sand wedge having the loft angle larger than the ninth iron also increase the loft sequentially at intervals of 4 °. Therefore, factors related to the distance of the club selected during play are only the loft angle of the club head and the length of the shaft. This is because, of course, the smaller the loft angle, the smaller the launch angle of the hit ball and the smaller the spin applied to the hit ball, and the longer the shaft, the higher the head speed and the greater the impact on the hit ball. Because you do.

However, conventionally, no consideration has been given to the structure and shape of the shaft for transmitting the will of the player to the club head in accordance with the club number, in a set of clubs. That is, in the conventional golf club shaft set, as described above, the lengths of the intermediate region and the rear end region of the shaft are the same for each club, and the distance between the predetermined position of the intermediate region from the tip of the shaft and its position Since the inclination of the gradient indicating the relationship with the bending stiffness of the shaft is the same for each club, the distance from the hand to the bending point (kick point) is almost the same even for clubs with different numbers, and as a result, the feel at impact Were almost the same, and only the flight distance corresponding to the loft angle and the shaft length of the head of each club could be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can provide each club with a function required according to the club number.
An object of the present invention is to provide a golf club shaft set capable of obtaining a flight distance.

[0008]

According to the present invention, in order to achieve the above object, an intermediate region between a front end region where a head is mounted and a rear end region where a grip is mounted has a hollow truncated cone shape. A shaft set comprising a plurality of golf club shafts to be formed, wherein the length of each shaft is different according to the number of the club, and the length of the intermediate region is increased as the shaft becomes longer, and the length of the intermediate region is increased. Provided is a golf club shaft set, characterized in that the inclination of the gradient indicating the relationship between the distance from the tip of the shaft at a predetermined position and the bending rigidity of the shaft at that position is reduced as the shaft becomes longer.

In the golf club shaft set of the present invention, the distance from the hand to the bending point increases as the shaft lengthens, and the bending point moves from the hand to the long club from the short club. It changes to the first condition. Therefore, for example, in the case of an iron club, a shaft having a long shaft 3
With a number iron, a ball with a high initial velocity can be obtained with a relatively low trajectory, and the flight distance increases. In the case of a 9-iron with a short shaft, a powerful trajectory can be obtained at a relatively high launch angle, and a target can be aimed at a point.

In the present invention, as means for increasing the length of the intermediate region of the shaft as the shaft becomes longer,
For example, there is a means for preparing a plurality of mandrels having different lengths and outer diameters corresponding to the length and the outer diameter of the intermediate region to form a shaft. Means for decreasing the gradient of the gradient indicating the relationship between the distance from the shaft tip at a predetermined position in the intermediate region and the bending rigidity of the shaft at that position as the shaft becomes longer include, for example, a shaft at a predetermined position in the intermediate region. Means for reducing the slope of the gradient indicating the relationship between the distance from the tip and the shaft outer diameter at that position, as the shaft becomes longer, the relationship between the distance from the shaft tip at a predetermined position in the intermediate region and the shaft outer diameter at that position The slope of the gradient indicating is constant through each shaft,
Means for changing the shaft structure between the shafts and the like can be cited, but it is more preferable to employ such means.

Further, in the shaft set of the present invention, in the intermediate region of the shaft, a portion where the ratio of the distance (β) from the front end of the intermediate region to the length (α) of the intermediate region is equal,
That is, it is preferable to make the bending stiffness of the shafts at locations where β / α are equal through the shafts substantially equal. This aligns the timing of the swing between the counts,
This is because the hit feeling is uniform.

Further, in the shaft set of the present invention, it is appropriate that the lengths of the leading end region and the trailing end region of the shaft are substantially equal through each shaft. This is because the sensitivity at the time of turning back the swing is to be as uniform as possible.

In the shaft set of the present invention,
The length and outer diameter of each shaft are not particularly limited, for example,
The length of the middle region of the shaft is 610-7 for 3 iron
The length of the front end region is 40 to 80 mm, and the length of the rear end region is 200 to 300 mm.
mm. In addition, the outer diameter of the front end of the intermediate region of the shaft is 9.0 to 9.4 mm, the outer diameter of the rear end of the intermediate region is 14.0 to 14.5 mm, and the outer diameter of the front end region is 9.0 to 9.0.
9.4 mm, outer diameter of rear end area is 14.7 to 15.2 mm
It can be.

The other points of the shaft used for the shaft set of the present invention can be the same as the conventional shaft. For example, the shaft used in the present invention can be formed by forming a prepreg laminate around a mandrel having a shape corresponding to the shape of the shaft, and then heating and curing the laminate. As the prepreg, for example, a sheet-like material prepared by impregnating a thermosetting resin into a reinforcing fiber such as a roving, cloth, or mat, which is aligned in parallel, can be used. in this case,
As the reinforcing fiber, one or more of carbon fiber, glass fiber, metal fiber, aramid fiber, silicon carbide fiber, alumina fiber, boron fiber, etc., and as the thermosetting resin, epoxy resin, phenol resin, unsaturated polyester resin, etc. 1
More than species, auxiliary materials include curing agents, curing accelerators, fillers,
A release agent, a pigment, and the like can be used. Particularly preferred prepregs are those using carbon fiber, boron fiber as the reinforcing fiber, and epoxy resin, phenol resin, or unsaturated polyester resin as the resin.

The prepreg has, for example, a diameter of 4 to 10 μm.
A bundle of 6 to 12 units is bundled in parallel to form a sheet, and a thin sheet of a thermosetting resin is stacked thereon, and then this is heated with a heat roller. It can be manufactured by impregnating a resin on the fiber sheet and between the fibers through the space. It is appropriate that the resin content of the prepreg is about 25 to 37% by weight. The resin content of the prepreg is the ratio of the weight of the resin to the total weight of the prepreg, and the weight of the resin includes the weight of auxiliary materials such as a curing agent, a catalyst, and a sizing agent. The thickness of the prepreg is usually about 0.1 to about 0.5 mm.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a distance between a predetermined position of a shaft and a tip of the shaft in a golf club shaft set for 3 to 9 irons according to an embodiment of the present invention. It is a graph which shows the relationship with the bending rigidity of a shaft.

In the shaft set of the present embodiment, the tip region A of the shaft mainly composed of the portion inserted into the hosel of the club head and the rear end region C where the grip is mounted are for the third to ninth irons. And the gradient indicating the relationship between the distance from the shaft tip at a predetermined position in the front end region A and the rear end region C and the bending rigidity of the shaft at that position are substantially the same. In the present example, the bending stiffness is increased toward the rear end in the rear end region C. However, each position of the rear end region C may have substantially the same bending stiffness.

The intermediate area B is sequentially 0.5 inches (1) from the third iron (# 3) to the ninth iron (# 9).
(2.7 mm). In the intermediate region B, the slope of the gradient indicating the relationship between the distance from the shaft tip at a predetermined position in the intermediate region B and the bending rigidity of the shaft at that position decreases as the shaft becomes longer. In other words, the gradient of the gradient is maximum for the ninth iron and decreases toward the minimum for the third iron. In this example, the change in rigidity in the intermediate region B is indicated by a straight line for convenience, but may be changed in a curved shape as appropriate.

Further, in the shaft set of the present embodiment, in the intermediate region B of the shaft, the shaft (β / α) at the position where the ratio (β / α) of the distance (β) from the front end of the intermediate region to the length (α) of the intermediate region B is equal. Are substantially equal throughout each shaft. That is, in FIG. 1, the lines d, e, f and g respectively correspond to the above β in the intermediate region B.
Where / α is 1/4, 2/4, 3/4, 4/4, but the bending stiffness on each line d, e, f, and g is substantially equal through the 3rd to 9th irons Has become.

FIG. 2 is a graph showing the relationship between the distance from the tip of the shaft at a predetermined position of the shaft and the outer diameter of the shaft at that position. The front end region A has a cylindrical shape having substantially the same outer diameter through the 3rd to 9th irons, and the rear end region C has a truncated cone shape whose outer diameter increases toward the rear end. However, the rear end area C may be formed in a cylindrical shape extending in the longitudinal direction with the same diameter as the outer diameter of the rear end position of the intermediate area B.

The inclination of the gradient indicating the relationship between the distance from the tip of the shaft at a predetermined position in the intermediate region B and the outer diameter of the shaft at that position decreases as the shaft becomes longer. In other words, the gradient of the gradient is maximum for the ninth iron and decreases toward the minimum for the third iron. However, in the intermediate region B, the outer diameter of the shaft at a position where the ratio (β / α) of the distance (β) from the front end of the intermediate region to the length (α) of the intermediate region B is equal to:
It is substantially equal throughout each shaft. That is, in FIG. 2, lines d, e, f, and g indicate the locations where βα is １ ／, 2/4, 、 ３, and ／ in the intermediate region B, respectively. The outer diameters of the shafts on e, f and g are substantially equal through the 3rd to 9th irons.

In order to form the shaft set of this embodiment, for example, a plurality of mandrels having different lengths and outer diameters corresponding to the length and the outer diameter of the intermediate region B are prepared, and the mandrels around the mandrels are shown in FIGS. Prepreg X with such fibers inclined upward to the right
A prepreg Y in which the fiber is inclined upward to the left and a prepreg Z in which the fiber is parallel to the axis of the mandrel are appropriately combined, and these are formed in a plurality of layers (usually 4 to 1) around the mandrel by an ordinary method.
(0 layer) After winding to form a laminated body, a method of heating and curing the laminated body can be adopted. in this case,
Normally, the same number of prepregs X, Y, and Z are used through the third to ninth irons. However, what is important at this time is that the angle of the prepreg with respect to the mandrel axis at the positions of the lines d, e, f, and g shown in FIG. 2 and the thickness of the prepreg laminate at each of the above positions are 3
That is, they are substantially equal through the number 9 to number 9 irons.

In the above description, the FRP shaft set for the 3rd to 9th iron sets has been referred to. However, the shaft set of the present invention is not limited to other iron clubs, for example, 1 iron, 2 iron, pitching wedge. That it can be applied to iron setting shafts including pitching sand, sand wedges, etc., and that it can be applied to wood club shafts such as No. 1 to No. 5 wood,
Further, it is needless to say that the present invention can be applied to a metal shaft.

[0024]

According to the golf club shaft set of the present invention, since a bending point changes from a hand tone to a tip tone from a short club to a long club, functions required according to the club number are provided to each club. It is possible to obtain a good hit feeling and a good flight distance according to the club number.

[Brief description of the drawings]

FIG. 1 shows a relationship between a distance from a shaft tip at a predetermined position of a shaft and a bending stiffness of the shaft at that position in a golf club shaft set for 3rd to 9th irons according to an embodiment of the present invention. FIG.

FIG. 2 is a graph showing a relationship between a distance from a tip of a shaft at a predetermined position of the shaft and an outer diameter of the shaft at that position in the shaft set of the same example.

FIG. 3 is an explanatory diagram illustrating an example of a prepreg.

FIG. 4 is an explanatory diagram showing an example of a prepreg.

FIG. 5 is an explanatory diagram showing an example of a golf club.

FIG. 6 is a graph showing a relationship between a distance from a tip of a shaft at a predetermined position of the shaft and a bending rigidity of the shaft at that position in a conventional golf club shaft set for 3rd to 9th irons.

FIG. 7 is a graph showing a relationship between a distance from a shaft tip at a predetermined position of the shaft and an outer diameter of the shaft at that position in the shaft set of the same example.

[Explanation of symbols]

 A front end area B middle area C rear end area

Claims (4)

[Claims] An intermediate region between a front end region where a head is mounted and a rear end region where a grip is mounted is composed of a plurality of hollow golf club shafts having a truncated cone shape.
A shaft set in which the length of each shaft differs according to the club number, wherein the length of the intermediate region is increased as the shaft becomes longer, and the distance between the predetermined position of the intermediate region from the shaft tip and the position thereof A golf club shaft set characterized in that the inclination of the gradient indicating the relationship with the bending rigidity of the shaft in (1) is reduced as the shaft becomes longer. 2. The shaft set according to claim 1, wherein the gradient indicating the relationship between the distance from the shaft tip at a predetermined position in the intermediate region and the outer diameter of the shaft at that position is reduced as the shaft becomes longer. 3. The shaft set according to claim 1, wherein the bending stiffnesses of the shafts at the positions where the ratio of the distance from the front end of the intermediate region to the length of the intermediate region is equal in the intermediate region are substantially the same throughout each shaft. . 4. The shaft set according to claim 1, wherein the lengths of the leading end region and the trailing end region are substantially equal through each shaft.