JPH11146932A - Iron golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron golf club set comprising at least 7 iron golf clubs of the club numbers 3 to 9 in which return of a head of each club can be roughly set constant when swinging is performed in similar conditions. SOLUTION: In an iron golf club set comprising 7 iron golf clubs of the club numbers 3 to 9, when a head weight of W (gf), a gravity center distance as measured from a head gravity center G perpendicularly to a shaft axial line of L (mm), and a lie angle of θ( deg.), then a rotation moment Mx (gf.mm) of the club head 3 around a shaft axial line is W×cosθ×L, and with an average value of Mxm of rotation moments of all the iron golf club heads 3-9 are denoted, a rotation moment value for all the iron golf club heads is 0.97 Mxm or more and 1.03 Mxm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron golf club set, and more particularly, to a golf club set provided that a golfer swings at least seven iron golf clubs of the third to ninth clubs in the same condition. The present invention relates to an iron golf club set that allows each club to fly in the same direction by making each of the clubs return substantially the same.

[0002]

2. Description of the Related Art In general, an iron golf club is a club mainly for obtaining an accurate flight distance. Therefore, the number of clubs is 3 to 9 or a pitching wedge which makes it easy to raise the ball to the sky and to reduce the number of runs. (PW),
Many are sand wedges (SW).

[0003] Of iron golf clubs, club numbers 3 to 9 are often hit in full swing.
Since wedges such as PW and SW are used to hit a short distance within about 100 yards more accurately, they often have a unique sole shape and are often used for control shots with moderate swing power. Therefore, in the case of a wedge, the flight distance depends on the golfer's skill, but in the 3rd to 9th iron golf clubs hitting with a full swing, the hitting direction and the flight distance depend on the performance of the golf club itself. Cheap.

However, in the conventional iron golf club set, even if the golfer swings at the same constant condition, the head returns slowly at the time of impact on the long iron side, so that the face tends to be in an open state. It tends to be easier. On the other hand, on the short iron side, the head is easily returned at the time of impact and the face tends to be closed, so that the hit ball tends to hook easily.

[0005] As a countermeasure, conventionally, for example, the degree of return of the club head is made constant by making the rotational moment My (head weight x center of gravity distance) of the club head around the shaft axis of each iron golf club the same. (Eg, Japanese Patent Application Laid-Open No. 54-222)
No. 41). However, since the head of a golf club has a different lie angle for each count, no matter how much the rotational moment My defined by the head weight x the center of gravity distance is the same for each club, the head of the head when swinging in the same condition does not matter. The return of the face could not always be constant for each club and was not an essential solution.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a golf club set including at least seven iron golf clubs of club numbers 3 to 9 if the golf clubs swing in the same condition and the head of each club is changed. An object of the present invention is to provide an iron golf club set capable of making return substantially constant.

[0007]

SUMMARY OF THE INVENTION In order to attain the above object, the present invention provides a seven iron golf club having at least a club number 3 to 9 in which the shaft length becomes shorter and the lie angle becomes larger as the club number becomes larger. In an iron golf club set comprising a club, the head weight of each iron golf club is W (gf), the center of gravity distance measured perpendicularly to the shaft axis from the center of gravity G of the head is L (mm), and the lie angle is θ (°). , The rotational moment of the club head about the shaft axis Mx (gf · mm) = W × cos θ × L,
Assuming that the average value of the rotational moment of the heads of all the No. 3 to No. 9 iron golf club sets is Mxm,
Each of the No. 9 to No. 9 iron golf clubs is characterized in that the value of the rotational moment of the head is 0.97 Mxm or more and 1.03 Mxm or less.

As described above, the rotational moment of the club head around the shaft axis is specified as in the above equation in relation to the lie angle, and the value is calculated as the average value of all the iron golf clubs from No. 3 to No. 9. By setting the range of 0.97 times to 1.03 times, the rotational moment of the club head around the shaft axis is kept substantially constant as long as the golfer swings in the same condition, and the return of the club head from the third to the ninth is performed. It can be made substantially constant in all clubs.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an example of an iron golf club set according to the present invention.
A series of 7s up to the number iron golf club A9
It consists of a golf club. Each golf club has a configuration in which a grip 2 is provided at an upper end of a club shaft 1 and a club head 3 is provided at a lower end. The club shaft 1 is connected to a hosel 4 projecting upward on the heel side of the club head 3.

These iron golf clubs A3 to A9
The loft angle of the flat face 6 formed on the front surface of the club head 3 gradually increases at a substantially constant rate as the club number increases. In addition, grip 2
The shaft length from the upper end of the club head to the lower end of the club head 3 gradually decreases toward the larger club number, while the inclination angle of the club shaft 1 with respect to the horizontal plane when the sole 7 is normally seated on the horizontal plane. The defined lie angle θ (°) increases at a substantially constant rate as the club number increases.

According to the present invention, as shown in FIG. 2, in each iron golf club A, the head weight of the club head 3 is measured in W (gf), and the center of gravity is measured from the center of gravity G of the head to the shaft axis X of the club shaft 1 perpendicularly. Distance (vertical distance from head center of gravity G to shaft axis X of club shaft 1)
Is defined as L (mm), the rotational moment Mx (gf · mm) around the shaft axis of each club head 3 is defined by the following equation including the relationship with the lie angle θ. If the value is their average value Mxm,
The value of the rotational moment Mx is set to be equal to or more than 0.97 Mxm and equal to or less than 1.03 Mxm so that the value of the rotational moment Mx is substantially equal to the value of the average value Mxm.

Mx = W × cos θ × L Rotational moment Mx around the shaft axis of the club head in the address state of each iron golf club
Is less than 0.97 Mxm or 1.0 to the average value Mxm of the rotational moments of these No. 3 to 9 iron golf clubs.
If it exceeds 03Mxm, when the golfer returns the head at the time of hitting the ball, even if each player counts and swings in the same condition, there is a sensational difference in the return of the head, causing a sense of incongruity when hitting the ball. It is not possible to swing at the same condition every time, and it becomes difficult to make a stable shot with the direction of the hit ball always constant.

The inventor of the present invention can swing all the iron golf clubs in the same condition only by keeping the rotational moment My defined by the center of gravity of the head × the distance of the center of gravity (W × L) constant. As a result of intensive studies on the point that the return degree of the head can not be kept constant, it is because the inclination of the shaft in the address state actually hit by the golfer differs for each count, in other words, the effect of the lie angle θ is not considered I found out.

That is, the rotational moment Mx about the shaft axis of the club head in the addressing state is exactly:
As shown in FIG. 2, it is the product of the head weight component Wv in the direction orthogonal to the shaft axis and the center of gravity distance L, and the head weight component Wv is the product W × the product of the head weight W and the cosine of the lie angle θ.
cos θ. Therefore, it is difficult to make the head return the same even if the rotational moment My of W × L is made the same for each club without considering the inclination of the lie angle θ as in the related art. Therefore, by making the rotational moment Mx defined in consideration of the inclination of the lie angle θ substantially the same in each club of the iron golf club set, if the golf ball swings in the same condition, the degree of return of the head becomes substantially constant. You can do it. Therefore, it is possible to make a stable shot in which the hitting direction is always fixed.

The range of the loft angle in the iron golf club set of the present invention is 15 ° to 45 °, preferably 20 ° to 45 °. Iron golf clubs with a loft angle of less than 15 ° are not loft angles that are not enough to raise the ball, do not provide sufficient flight distance, are effective in special situations such as strong winds, and are not very common. . In addition, iron golf clubs having a loft angle of more than 45 °
Even if the sole shape is not unique such as PW and SW, the control force is often increased by adjusting the swing force.

[0016] The iron golf club set of the present invention comprises:
In the above-described embodiment, a set of seven clubs having a club number of 3 to 9 is set.
No. iron golf clubs, pitching wedges, sand wedges, etc. may be included.
Even in the case of a set of more than one, it is sufficient that at least the above-described iron golf clubs having the third to ninth club numbers have the above-described configuration.

Although the shaft length in the iron golf club set of the present invention becomes shorter as the club number becomes larger, the length between adjacent numbers is not necessarily limited to the same length and becomes shorter in order. The present invention is directed to a method in which the shaft length tends to be shortened as the club number increases, even if the club length increases and the club length increases. Is included.

Although the lie angle in the iron golf club set of the present invention increases as the club number increases, the number of adjacent numbers is not necessarily limited to the same size and sequentially increases, but the number of adjacent numbers differs. Depending on the size, the part with the same lie angle may be included depending on the number between adjacent counts, or the part with the larger club number may have a smaller lie angle depending on the number between adjacent counts, so-called reverse Even if the club includes a portion, the lie angle tends to increase as the club number increases.

The club number in the iron golf club set of the present invention does not necessarily have to be a number. Even in an iron golf club set in which the club number is indicated by a symbol, a proper noun, or the like, the iron golf club may be used. Loft angle in the set is 15 ° to 45 °
If all the iron golf clubs constituting the range of ° are included in the scope of the present invention, they are included in the present invention.

EXAMPLE In a club set composed of seven iron golf clubs of the club numbers 3 to 9 shown in FIG. 1, the rotational moment Mx around the shaft axis of the head including the relationship with the lie angle θ is completely reduced. If the average value of the club is Mxm,
The present invention set 1 in which the values of the rotational moments of the heads of all the No. 9 to No. 9 iron golf clubs are in the range of 0.97 Mxm to 1.03 Mxm, and further, the loft angle is 15 ° to 45 °
A set 3 of the present invention in which the setting of the lie angle is changed with respect to the sets 1 and 2 of the present invention;
A conventional set 1 in which the rotational moment is not considered at all, a conventional set 2 in which the rotational moment My = W × L around the shaft axis of the head is made substantially the same for each club without considering the lie angle θ, and a lie angle For the test, the rotational moment My = W × L around the shaft axis of the head is made substantially the same for each club without considering the above, and the conventional set 3 in which the setting of the lie angle is changed with respect to the conventional sets 1 and 2 is used for the test. Each was prepared as a set.

In each of the test sets, the club length and head weight of each club number are made common as shown in Tables 1 to 3, and the center of gravity is set in the present set 2 and the conventional set 2 and in the present set 3 and the conventional set 3. By changing the distance,
The rotational moment MX around the shaft axis of the head,
My (gf · mm) was adjusted as shown in Tables 1-3.

An actual hitting test was performed on these test sets under the following measurement conditions, and the results shown in Table 4 were obtained. Actual hit test : 5 intermediate amateur golfers a, b,
An actual hit test was performed using c, d, and e, and it was determined whether or not a substantially constant ball muscle was obtained when swinging in the same condition.
(No) was evaluated.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

[Table 4]

As is clear from Table 4, the iron golf club set of the present invention can obtain a substantially constant ball muscle, and the swing of the head can make the return of the head substantially constant. I understand.

[0028]

As described above, according to the present invention, in an iron golf club set including at least seven iron golf clubs having a club number of 3 to 9, the rotational moment about the shaft axis of the club head is defined as the lie angle. Since it is specified in association with each other and made substantially the same in each iron golf club, if the golfer swings about each iron golf club in the same condition, the return condition of the head of each iron golf club can be made substantially constant. .

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an iron golf club set of the present invention with a part of a club shaft omitted.

FIG. 2 is an explanatory diagram showing a rotational moment about a shaft axis of a club head according to the present invention.

[Explanation of symbols]

Reference Signs List 1 club shaft 2 grip 3 club head 4 hosel 6 face 7 sole A, A3-A9 iron golf club G head center of gravity L center of gravity distance X shaft axis θ lie angle

Claims (3)

[Claims] 1. An iron golf club set comprising at least seven iron golf clubs having at least 3 to 9 club numbers, wherein the shaft length becomes shorter and the lie angle increases as the club number increases. The club head weight is W (gf), the center of gravity measured from the center of gravity of the head G perpendicular to the shaft axis is L (mm), and the rotational moment of the club head around the shaft axis when the lie angle is θ (°). Mx (gf ・ mm)
= W × cos θ × L, and the average value of the rotational moments of the heads of all the third to ninth iron golf club sets is M
An iron golf club set in which the rotational moment values of the heads of all the third to ninth iron golf clubs are 0.97 Mxm or more and 1.03 Mxm or less, where xm. 2. The club head has a loft angle of 15 ° or more.
The iron golf club set according to claim 1, wherein the angle is within a range of 45 °. 3. The iron golf club set according to claim 1, wherein the club number includes a pitching wedge and a sand wedge in addition to the seven iron golf clubs No. 3 to No. 9.