JPH10328337A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club wherein a warping balance of the shaft is improved so that a difference in the lie angle at the time of an impact based on the lie angle at the time of an addressing may not become larger. SOLUTION: A warping angle θ of a shaft 1 is made to be within 9.5 deg., preferably within 9.2 deg. for this golf club. The warping angle θ is measured by the following method. When a portion from the base end of the shaft 1 to a location (a) at 173 mm, is cantilever-supported, and the fitted end of a head 5 at the tip end of the shaft is made a reference point (b), the warping angle is an angle between the tangent of the shaft at the reference point and the axis of the shaft under a cantilever-supported state when the shaft at the reference point (b) is warped by an amount of 0.1×L. In this case, L is a distance between (a) and (b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club, and more particularly, to a golf club having improved shaft deflection balance (the condition of the golf club), and an iron set and a wood made of such a golf club. Club set (SW and PW may be excluded).

[0002]

2. Description of the Related Art In recent years, the size of golf club heads has been increasing with the theme of expanding sweet spots, which includes the use of new materials and the combination of different materials. I have.

However, when the distance from the axis of the shaft to the position of the center of gravity of the head is increased due to the increase in the size of the head, the following problems are likely to occur. When actually swinging, from the top position shown in FIG.
Due to the centrifugal force of the head at the time of the downswing reaching the impact position shown in FIG. 5, the shaft is bent in the direction shown by the arrow. As described above, if the shaft bends during the downswing, a difference occurs between the lie angle at the address and the lie angle at the impact, and the lie angle of the head imaged at the address and the lie angle at the impact change. As a result, it is easy to hit the ball at a position shifted from the sweet spot, and it becomes difficult to make an accurate shot.

[0004] Further, the toe-down of the head at the time of impact increases, and if the toe-down is too large, the toe comes into contact with the ground or the heel floats, resulting in duffing and topping.

The inventor of the present invention has proposed improving the deflection balance of a shaft, specifically, measuring the deflection angle of a golf club shaft by a specific measuring method, and setting the deflection angle within a predetermined numerical value or a range. It has been found that the above-mentioned problems can be solved by designing and configuring as follows.

[0006] That is, an object of the present invention is to provide a golf club in which the deflection balance of the shaft is improved so that the difference between the lie angle at impact and the lie angle at impact is not increased.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a golf club having an iron deflection angle θ of 9.5 degrees or less, preferably 9.2 degrees or less. It is characterized by constituting a club set including a set or wood.

The present invention also relates to a golf club iron set (SW and PW may be excluded) or a golf club set including wood (SW and PW may be excluded). Approximately match the deflection angle θ of the club shaft (the difference between the maximum value and the minimum value is within 0.5 degrees,
(Preferably within 0.3 degrees).

Further, the present invention is a golf club comprising a shaft which does not have a sudden change in rigidity from the tip to the grip side, and wherein the deflection angle θ of the shaft is within 9.5 degrees. And

The deflection angle θ is measured by the following method. 173mm from the base end of the shaft
When the shaft is flexed by the amount of 0.1 × L at the reference point b, when the position a of the shaft is cantilevered and the fitting end of the head at the tip of the shaft is set as the reference point b. , The angle between the tangent of the shaft at its reference point and the axis of the shaft in the cantilevered condition, where L = a,
Distance between b.

As described above, the deflection balance of the shaft can be improved by setting the deflection angle θ of the shaft by the above-described measuring method to be equal to or less than the predetermined numerical value or within the range. That is, at the time of actual impact, as shown in FIG. 1C, the centrifugal force generated in the head causes a deflection angle θ1 in the toe-heel direction at the mounting portion of the head. If the deflection angle θ of the shaft is equal to or less than the predetermined numerical value or within the above range, this θ1 does not become too large, and the occurrence of hitting at a position shifted from the sweet spot, duffing, and top is suppressed. can do.

[0012]

FIG. 2 shows a golf club according to the present invention. FIG. 2 (a) is a diagram showing the overall configuration, FIG. 2 (b) is a diagram showing a state in which a head is removed and cantilevered,
(C) is a diagram showing a state where a load W is applied at a reference point which is a fitting end of the head.

In the drawings, reference numeral 1 denotes a shaft. This shaft is a core in which a so-called prepreg sheet obtained by impregnating a sheet in which reinforcing fibers are aligned in a predetermined direction with a synthetic resin, has a predetermined arrangement, a laminated structure and the like. Wrapped around gold,
Thereafter, it is formed through steps such as heating, de-centering, and polishing according to a conventional method. A grip 3 is attached to the shaft 1 on the base end side, and a head 5 is fitted on the distal end side.

The configuration of the prepreg sheet (resin material, resin impregnation amount, type of reinforcing fiber used, alignment direction of the prepreg sheet) so that the entire shaft has the following bending characteristics can be obtained. , The number of turns, etc.) are determined as appropriate.

That is, 173 from the base end of the shaft 1
mm, the cantilever is supported up to a position a, and when the fitting end 5a of the head 5 at the tip of the shaft 1 is used as a reference point b, a load W is applied at the reference point b to move the shaft by a predetermined amount. Deflect. When the distance between a and b is L, the load W to be applied is set so that the amount of deflection is 0.1 × L. When the reference point b is bent by this amount, the reference point b The deflection angle θ between the tangent and the axis of the shaft in the cantilevered state is measured. Then, the shaft 1 is formed such that the deflection angle θ is within 9.5 degrees, preferably within 9.2 degrees.

As described above, by forming the shaft 1 so that the deflection angle θ is within 9.5 degrees, the deflection balance of the shaft can be improved, and the centrifugal force generated in the head 5 at the time of actual impact. In addition, it is possible to suppress the amount of bending generated at the mounting portion (fitting end portion 5b) of the head 5. In other words, it is possible to make an impact with an image similar to the image at the time of address,
The occurrence of a hit ball, a duff, and a top at a position shifted from the sweet spot can be suppressed.

Further, in this configuration, by making the shaft hard, the deflection angle θ can be reduced, but problems such as difficulty in swinging, poor hitting feeling, and the inability of the ball to fly are caused. For this reason, it is preferable to configure the shaft so that the handle is bent and the tip side is prevented from being bent as much as possible. That is, as shown in FIG. 3, it is preferable to provide the weight blending position P near the hand of the shaft 1 so that the shaft 1 is easily bent. θ can be reduced, it is possible to make an impact with an image similar to the image at the time of addressing, and it is possible to suppress hitting at a position shifted from a sweet spot, and occurrence of duffling and top, and in addition, The golf club is easy to swing, has a good hit feeling, and can improve the flight distance.

Further, in the above configuration, the shaft is
It is formed so that there is no sudden change in rigidity. Specifically, at any part in the longitudinal direction of the shaft, the difference between the maximum value and the minimum value of the bending stiffness (EI) within the length section 30 mm is less than 20% of the maximum value, ((EI maximum) − (EI
(Minimum)) / (EI maximum) <0.2. That is, if this value is 20% or more, there is a problem that it is difficult to take timing and there is a sense of incongruity when swinging, and further, stress concentration occurs in terms of strength, which tends to cause breakage. It is because.

With reference to the graph of FIG. 4, a golf club constructed according to the above-described measuring method will be described. Conventionally,
Generally, golf clubs on the market, when the deflection angle θ of the shaft is measured by the above-described measurement method, as shown by a square point, all the clubs are 9.8 degrees or more. The configuration does not take the deflection balance into account. When viewed as a club set, the deflection angle θ of each golf club is not constant, and the variation of the deflection angle is large as a whole club set. As a result, at the time of impact when swinging using such a club, as shown in FIG. 1C, the deflection angle θ1 is generated in the toe-heel direction due to the centrifugal force generated in the head. Is large, the deflection angle .theta.1 becomes too large, so that it is easy to hit a ball at a position deviated from the sweet spot, and it is easy to cause duffing and top. Further, if the deflection angle θ is different for each count of the club set, it is difficult to hit the ball with the same image in all the counts.

In the present invention, when the deflection angle θ of the shaft is measured by the above-described measuring method, the deflection angle is set to 9.
By forming the shaft so as to be within 5 degrees, preferably within 9.2 degrees (in the example shown in FIG. 4, about 8.9 degrees as shown by a circular point), the centrifugal force of the head at the time of impact is obtained. The toe-down caused by this can be suppressed as much as possible. That is, the difference between the lie angle at the time of address and the lie angle at the time of impact is reduced, so that it is easy to hit the ball at the position of the sweet spot aligned at the time of address, and an accurate shot is possible.

In this case, the golf clubs of each count are formed such that the deflection angle θ of the shaft thereof becomes the angle shown by the circular point in FIG. If a golf club set (including SW and PW may be omitted) including wood, an accurate shot can be performed regardless of which golf club is used during actual play. In addition, in particular, the deflection angles θ of the shafts of the golf clubs of the respective counts are substantially matched (the difference between the maximum value and the minimum value is within 0.5 degrees, preferably 0.1 degrees).
(Within three degrees), the golfer can swing with the same image regardless of the golf club of which golf club number is used, and an accurate shot can be made.

[0022]

According to the golf club constructed as in the present invention, the difference between the lie angle at impact and the lie angle at address does not become large. This makes it easier to hit the ball, and enables accurate shots. Further, by configuring each golf club of the club set including the iron set or the wood as in the present invention, an accurate shot can be performed using any club, and furthermore, the deflection angles of all the golf clubs can be reduced. By making them substantially coincide with each other, an accurate shot and a swing with the same feeling can be performed.

[Brief description of the drawings]

1A is a diagram illustrating a top position when a golf club is swung, FIG. 1B is a diagram illustrating an impact position,
(C) is a diagram showing the deflection of the shaft in the toe-heel direction at the time of impact.

FIG. 2 shows a golf club according to the present invention,
(A) is a diagram showing the entire configuration, (b) is a diagram showing a state in which the head is detached and cantilevered, and (c) is a state in which a load is applied at a reference point which is a fitting end of the head. FIG.

FIG. 3 is a diagram showing an example of a configuration for reducing a bending angle θ.

FIG. 4 is a graph comparing the bending angle θ between a conventional golf club and the golf club of the present invention for each count.

[Explanation of symbols]

 1 shaft 3 grip 5 head

Claims (3)

[Claims] 1. A golf club set (iron set or club set including wood), wherein the deflection angle θ of the shaft is within 9.5 degrees, preferably within 9.2 degrees; The deflection angle θ is measured by the following method. When the cantilever is supported from the base end of the shaft to a position a of 173 mm, and the fitting end of the head at the tip of the shaft is set as the reference point b, the shaft is set at 0.1 × L at the reference point b. The angle between the tangent of the shaft at its reference point and the axis of the shaft in the cantilevered position when flexed by an amount; L = distance between a and b. 2. An iron set for a golf club (SW,
PW may be excluded) or in a golf club set including wood (SW and PW may be excluded), the deflection angles θ of the shafts of the respective golf clubs substantially match (the maximum value and the minimum value). A difference of 0.5 degrees or less, preferably 0.3 degrees or less), wherein the golf club iron set or the club set;
Is measured by the method described in claim 1. 3. A golf club comprising a shaft having no sudden change in rigidity from the tip end toward the grip, and having a deflection angle θ of the shaft within 9.5 degrees; The deflection angle θ is measured by the method described in claim 1.