JP2001198243A - Iron golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize the difference in distance between the number of clubs. SOLUTION: The golf club set consists of 7 to 12 iron golf clubs having different loft angles. With reference to the depth A of the center of the gravity, which is the length of a perpendicular line drawn on the surface of a face from the center of gravity of a head of the club, and the height of the center of gravity B, which is the height of a sweet spot point where the perpendicular line intersects the surface of the face, if depths A and heights of the center of gravity B are taken to be A1, A2, A3, A4..., An-1, An, and B1, B2, B3m B4..., Bn-1, Bn in order of increasing numbers of clubs, equations (1)-(4) given below can be satisfied: A1>A1...(1) A1>=A2>=A3>=A4>=...>=An-1>=An...(2) B1<Bn...(3) B1<=B2<=B3<=4<=...<=Bn-1<=Bn...(4).

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 capable of equalizing the difference in flight distance between counts.

[0002]

2. Description of the Related Art The iron golf club set has a loft angle ranging from the lowest iron golf club having the smallest loft angle to the highest iron golf club having the largest loft angle. Are configured as a set of a plurality of different pieces, usually 7 to 12 pieces. Further, in the set, the loft angle of the iron golf club increases from the lowest club to the highest club at a substantially constant angle, for example, in increments of 3 to 6 °. Also, the club length tends to decrease from the lowest club to the highest club. For this reason, the maximum flight distance of the hit ball differs depending on each count, and the golfer can select the predetermined count as appropriate and strike different flight distances. Further, when the flight distances are separated, it is desired that the difference in flight distance between the counts in the set be uniform.

FIGS. 3A to 3C show a third iron golf club as a low iron golf club and a sixth iron b as an almost intermediate iron golf club among conventional iron golf club sets. The sand wedge c is taken out and schematically illustrated as a high-count iron golf club. In the figure, as for the head d of the iron golf club, the width f of the sole e increases as the head moves from a low head to a high head. For this reason, the center of gravity height B, which is the height of the sweet spot point P where the perpendicular line i drawn from the center of gravity G of the head d to the face h and the face h intersects, is set lower as the number becomes higher. (For example, Japanese Patent Publication No. 7-4437). The depth A of the center of gravity, which is the length of the perpendicular from the center of gravity G of the head to the sweet spot point P, is set to be smaller as the number becomes higher.

In general, in the head of an iron golf club, the lower the height B of the center of gravity, the higher the ball tends to rise, and conversely, the higher the height B of the center of gravity, the harder the ball rises. In general golfers, a high-count iron golf club (for example, a sand wedge) has a large loft angle and a small club length, so that it is relatively easy to catch the ball near the sweet spot and it is relatively easy to raise the ball high. However, in a low-count iron golf club (for example, a third iron), the loft angle is small and the club length is large, so that the ball tends to be hard to catch near the sweet spot and to be hard to rise.

For general golfers, FIG.
In the conventional iron golf club set as shown in the above, in the iron golf club on the high count side, the height B of the center of gravity of the head is low in spite of the large loft angle, and the flying distance is increased by the ball rising too high. And the flying distance cannot be obtained according to the count. Further, in the iron golf club on the low count side, since the loft angle is small and the ball is difficult to rise in the first place, the height of the center of gravity B is increased, so that the ball is more difficult to rise and the flight distance according to the loft angle can be similarly obtained. There is another problem. In such an iron golf club set, the difference in flight distance between the counts in the set cannot be equalized, and it is difficult to distinguish the flight distances.

The present invention has been devised in view of the above problems, and in particular, the height of the center of gravity is low on the low count side.
In addition, an iron that helps to prevent the loss of the flight distance by suppressing excessive rise of the ball of the iron golf club of the high count side, and to equalize the difference in the flight distance between the counts, based on the fact that the ball is raised at the high count side. It is intended to provide a golf club set.

[0007]

Means for Solving the Problems Claim 1 of the present invention
The above-mentioned invention has the lowest loft iron having the lowest loft angle.
Golf club with the highest loft angle
N golf clubs with different loft angles up to
Where n is a natural number from 7 to 12)
Golf club set, iron golf club
The length of the perpendicular drawn from the center of gravity of the head to the face
And the lie angle and the lof
In the standard condition of the club placed on the horizontal surface as
A plane at which the perpendicular and the face intersect from the horizontal plane
Center of gravity height B which is the height to the eat spot point and smell
From the lowest iron golf club to the highest
The depth of the center of gravity in the order of the iron golf clubs
Degree and height of center of gravity are each A₁, A_Two, A_Three, A_Four,…,
A_n-1, A_n, And B₁, B_Two, B_Three, B_Four, ..., B
_n-1, B_nWhen satisfying the following formulas
Iron golf club set to be featured. A₁> A_n … A₁≧ A_Two≧ A_Three≧ A_Four≧… ≧ A_n-1≧ A_n … B₁<B_n … B₁≤B_Two≤B_Three≤B_Four≦… ≦ B_n-1≤B_n …

The invention according to claim 2 has the lowest number.
Iron golf club depth of center A ₁And the highest number
Iron golf club depth of center A_nAnd the ratio (A₁/ A
_n) Is from 1.05 to 2.00, and
Height of center of gravity B of Ian Golf Club₁And the highest number
Height of center of gravity B of Ian Golf Club_nAnd the ratio (B₁/
B _n) Is 0.50 to 0.95.
An iron golf club set according to claim 1.

The invention according to claim 3 has the lowest number.
Iron golf club loft angle α ₁And the highest number
Ian Golf Club Loft Angle α_nAnd the average of
Ft angle ｛(α₁+ Α_nWith loft angle closest to) / 2 °
Of the center of gravity A of an intermediate iron golf club_m, Height of center of gravity
Sa B_m(When there are two intermediate iron golf clubs,
Heart depth A_m, Height of center of gravity B_mIs the average of the two clubs
You. ) Satisfies the following formula:
Item 3. An iron golf club set according to item 1 or 2.
You. A₁/ A_m= 1.02 to 1.50 A_m/ A_n= 1.02 to 1.50… B₁/ B_m= 0.70-0.98 B_m/ B_n= 0.70 to 0.98 ...

According to a fourth aspect of the present invention, the loft angle is 2
A long iron golf club with a loft angle of 7 ° or less, a middle iron golf club with a loft angle of more than 27 ° and 39 ° or less, and a short iron golf club with a loft angle of more than 39 ° In addition, the long iron golf club has a center of gravity depth A of 6.5 to 1
For a middle iron golf club having a center-of-gravity depth B of 15.0 to 19.0 mm and a center-of-gravity height B of 0.05 mm, the center-of-gravity depth A is 6.0.
0 to 9.5 mm and the height B of the center of gravity is 16.0 to 20.0 mm,
Moreover, the short iron golf club has a center of gravity depth A of 5.0-9.0 mm and a center of gravity height B of 17.0-2.
The iron golf club set according to any one of claims 1 to 3, wherein the iron golf club set is 1.0 mm.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Iron golf club set of the present embodiment (hereinafter sometimes simply referred to as “set”)
Is, most low count of iron golf club loft angle α ₁ is the minimum (hereinafter referred to simply as "Club")
From 2a, loft angle is different from n this up to the highest count of club 2c loft angle α _n is the maximum (where, n is 7 to 1
2 (a natural number of 2).
(C) and (B) show the lowest club number 2 from the set.
a (# 3: 3rd iron) and highest club 2c
(SW: sand wedge) and the iron golf club 2b (# 6: 6th iron) between them are drawn out and shown.

[0012] Such a set includes, for example, a set of seven general irons from 3 irons to 9 irons, and one or more of these from a 2 iron, a pitching wedge, an approach wedge, a sand wedge, a lob wedge, and the like. It can be composed of eight or more additional wires. More specifically, the set of the present embodiment includes at least one long club having a loft angle of 27 ° or less and at least one middle club having a loft angle of greater than 27 ° and 39 ° or less. The golf club is configured to include a club and at least one short iron golf club having a loft angle larger than 39 °. In the set, according to custom,
The loft angle α is changed at intervals of about 3 to 6 ° between counts,
The club length is set so as to gradually or gradually decrease as the loft angle increases.

Each of the clubs 2 (simply referred to as 2
2) includes a shaft 3 and a head 4 fixed to one end of the shaft 3, as shown in FIG. The head 4 includes a head body 4A, which includes a face surface 5 for hitting a ball, and a hosel 4B, which is connected to the heel 6 side of the head body 4A and to which one end of the shaft 3 is mounted. It is formed integrally. In addition, as shown in FIG. 1, the head body 4A of the present embodiment includes a cavity (recess) C formed by cutting the back face 9 in the back face 9 so that the back face 9 is formed. A rib 10 protruding from the periphery of the head body 4A is formed. FIG. 1 is a vertical end view perpendicular to the face surface 5 passing through the center of gravity G of the head.

The head main body 4A of the present embodiment is
The first metal material m1 having a lower specific gravity and the second metal material m2 having a higher specific gravity than the first metal material m1 are formed. In the present embodiment, the first metal material m1 constitutes a main part of the head main body 4A and is formed of, for example, stainless steel (SUS630). The second metal material m2 is embedded in the sole portion 7 or the rib 10. In the present example, it is formed from a tungsten-copper alloy. Further, in the present embodiment, the second metal material m2 is arranged so as to be higher as the center of gravity g of the second metal material m2 itself changes from the lower-numbered club 2a to the higher-numbered club 2c. ing. As described above, by appropriately changing the shape, specific gravity, arrangement position, and the like of the second metal material m2, the center of gravity G of the head is obtained.
Is preferred in that it is easy to adjust the position as needed.

Also, in the set of the present embodiment, the depth of the center of gravity A, which is the length of a perpendicular drawn from the center of gravity G of the head of the club 2 to the face surface 5, and the lie angle β (FIG. And the center of gravity height B, which is the height from the horizontal plane H to the sweet spot point P where the perpendicular and the face surface 5 intersect in the reference state of the club placed on the horizontal plane H, as the loft angle α. It is regulated as follows. That is, most low-count club 2a to the highest count of club 2c said to count order centroid depth A, the center of gravity height B respectively _{A 1, A 2, A 3} , A 4, ..., A n-1,
A _n, and _{B 1, B 2, B 3} , B 4, ..., B n-1, B n
In this case, one of the features is that the clubs in the set satisfy the following formulas. _{A 1> A n ... A 1} ≧ A 2 ≧ A 3 ≧ A 4 ≧ ... ≧ A n-1 ≧ A n ... B 1 <B n ... B 1 ≦ B 2 ≦ B 3 ≦ B 4 ≦ ... ≦ B n _-1 ≦ B _n …

In such a set, the highest-numbered class
Is the height B of the center of gravity of the head. _nThe relative within the set
Large and center of gravity depth A_nIs set relatively small
To prevent the ball from rising too high,
Is to prevent loss of flight distance and to provide a flight distance commensurate with the count
Is possible. The club 2a with the lowest count is
Height B of center of gravity₁Is relatively small and deep in the center of gravity
Degree A₁Is set relatively large so that the ball rises
It becomes easier and ultimately the flight distance according to the loft angle
Can be issued. This allows each set in the set
It helps to equalize the difference in flight distance between the counts.

Further, in this set, by satisfying the above formulas and formulas, for example, as the count in the set becomes larger, the height of the center of gravity of the head may be gradually increased, that is, the following formula may be satisfied. This allows
The height of the center of gravity can be changed more optimally in accordance with the ease with which the ball rises, which is preferable in that each club 2 can further separate the flight distance corresponding to the ball count. B ₁ <B ₂ <B ₃ <B ₄ <... <B _n-1 <B _n

Here, the ratio (A ₁ / A _n ) of the center of gravity A ₁ of the lowest club 2a to the center of gravity An of the highest club 2c is, for example, 1.05 to 2.00. Preferably 1.10 to 1.70, more preferably 1.20
It is desirable to set it to 1.50. The ratio (B ₁ / B _n ) of the height B ₁ of the center of gravity of the lowest-numbered club 2 a to the height B _n of the center of gravity of the highest-numbered club 2 c is the ratio (A ₁ / B).
A _n ) in combination with any of the above.
It is desirably 50 to 0.95, preferably 0.60 to 0.95, and more preferably 0.80 to 0.93.

When the ratio (A ₁ / A _n ) is less than 1.05 or when the ratio (B ₁ / B _n ) is greater than 0.95, the depth A or the height of the center of gravity in the set. If the change in B is too small and the ratio (A ₁ / A _n ) is greater than 2.00 or if the ratio (B ₁ / B _n ) is less than 0.50, Of the center of gravity depth A or the center of gravity height B is too large, so that in any case, it is possible to achieve a flight distance commensurate with the count from the lowest club 2a to the highest club 2c. Tends to be difficult

The loft angle α of the lowest-numbered club 2a
_When a club having a loft angle closest to an average loft angle {(α ₁ + α _n ) / 2} obtained by averaging the loft angle α _n of the club 2 c with the highest count as the intermediate count club,
The center of gravity depth A _m and the center of gravity height B of this intermediate-count club
_m (When there are two clubs of intermediate count, the depth of the center of gravity A _m ,
Height of center of gravity B _m is a mean value of the two clubs. ) Desirably satisfies the following expressions in relation to the lowest-numbered and highest-numbered clubs. Accordingly, the depth of the center of gravity and the height of the center of gravity are optimized also for the club of the intermediate count, which is desirable in that the difference in the flight distance between the counts can be further uniformed within the set. _{A 1 / A m = 1.02~1.50 ...} A m / A n = 1.02~1.50 ... B 1 / B m = 0.70~0.98 ... B m / B n = 0. 70 ~ 0.98…

In particular, the ratios (A ₁ / A _n ), (A _m /
_An ) is preferably 1.05 to 0.40, more preferably 1.08 to 1.30, and the ratio (B ₁ / B _m )
The preferred _{(B m / B n) 0.80~0.96} , more preferably it is desirable that the 0.90 to 0.96.

More specifically, in the long club, the depth A of the center of gravity is 6.5 to 10.0 mm,
More preferably, it is 6.5 to 8.0 mm, and the height of the center of gravity B
From 15.0 to 19.0 mm, more preferably from 17.0 to 1
It is desirable to set it to 9.0 mm. In the middle type club, the depth A of the center of gravity is 6.0 to 9.5 mm, more preferably 6.0 to 7.5 mm, and the height B of the center of gravity is 16.0.
２20.0 mm, more preferably 18.0 to 20.0 mm. Further, in the short type club, the depth A of the center of gravity is 5.0 to 9.0 mm, more preferably 5.0 to 7.0 mm, and the height B of the center of gravity is 17.0 to 2 mm.
It is desirable that the thickness be 1.0 mm, more preferably 19.0 to 21.0 mm.

[0023]

Next, an embodiment of the present invention will be described. A titanium alloy face plate is pressed into a stainless steel head body to
3 to # 9, PW, AW: approach wedge, SW) were prototyped (Example), and a shaft was attached to each head to produce an iron golf club set including ten iron golf clubs. As shown in FIG. 1, a second metal material made of a tungsten-copper alloy is disposed on the head body to adjust the center of gravity of the head. This set satisfies all of the above equations.

Then, each club of the iron golf club set is mounted on a swing robot, and a test hit test is performed by adjusting the head speed at the time of impact with a third iron to 38 m / s, and the flight distance of the ball (carry + Run) was measured. For comparison, an iron golf club set outside the present invention (a comparative example, in which the shaft, the loft angle, and the club length are the same as those in the example) was also tested. Table 1 shows the test results and the like.

[0025]

[Table 1]

As a result of the test, in the set of the embodiment, the difference in the flight distance for each count is uniformed to approximately 10 to 11 m, whereas in the set of the comparative example, the club particularly on the higher count side is used. It can be confirmed that the flight distance loss is large and the difference in flight distance between the counts varies.

[0027]

As described above, in the iron golf club set of the present invention, the club of the highest count is set such that the center of gravity of the head is relatively large and the center of gravity is relatively small in the set. As a result, it is possible to prevent the ball from rising too high, thereby preventing loss of the flight distance and achieving a flight distance commensurate with the ball count. In the lowest-numbered club, the height of the center of gravity of the head is set to be relatively small and the depth of the center of gravity is set to be relatively large within the set, so that the ball is easily lifted. As a result, within the set, it is possible to provide each club with a flight distance corresponding to the count corresponding to each loft angle, which helps to equalize the difference in flight distance between the counts within the set.

[Brief description of the drawings]

1 (A) to 1 (C) are schematic views of an iron golf club set showing an embodiment of the present invention.

FIG. 2 is a partial front view of the club.

FIGS. 3A to 3C are schematic views of a conventional iron golf club set.

[Explanation of symbols]

 2 Iron golf club 2a Lowest iron golf club 2c Highest iron golf club 4 Head A Depth of center of gravity B Height of center of gravity

Claims (4)

[Claims] 1. An n-type golf club having different loft angles from the lowest iron golf club having the smallest loft angle to the highest iron golf club having the largest loft angle (where n is a natural number of 7 to 12). ) Is an iron golf club set, wherein the depth of the center of gravity A, which is the length of a perpendicular drawn from the center of gravity of the head of the iron golf club to the face surface, and the set lie angle and loft angle At the center of gravity height B, which is the height from the horizontal plane in the reference state of the club mounted on the horizontal plane to the sweet spot point where the perpendicular and the face face intersect, the highest iron golf club to the highest iron golf club The depth of the center of gravity and the height of the center of gravity are A ₁ , A ₂ , A ₃ , A ₄ ,...
A _n-1, A _n, and _{B 1, B 2, B 3} , B 4, ..., B
An iron golf club set characterized by satisfying the following expressions when _n-1 and _Bn . _{A 1> A n ... A 1} ≧ A 2 ≧ A 3 ≧ A 4 ≧ ... ≧ A n-1 ≧ A n ... B 1 <B n ... B 1 ≦ B 2 ≦ B 3 ≦ B 4 ≦ ... ≦ B n _-1 ≦ B _n … And wherein the lowest count of iron golf clubs centroid depth A _1, the ratio of the depth of the center of gravity A _n the highest count of iron golf club (A ₁ / A _n) is at 1.05 to 2.00 There, and most low-count iron golf club of the center of gravity height B _1, the highest count of the ratio of the height of the center of gravity B _n of iron golf club (B ₁ / B _n) is at 0.50 to 0.95 The iron golf club set according to claim 1, wherein: 3. The lof of the lowest iron golf club.
Angle α₁And the most expensive iron golf club Loff
Angle α_nAnd the average loft angle 平均 (α₁+ Α_n) /
An intermediate iron golf club having a loft angle closest to 2 °
Love center of gravity depth A_m, Height of center of gravity B_m(Intermediate Irongor
Depth of gravity A_m, Height of center of gravity B _m
Is the average of the two clubs. ) Is the following formula
3. An eye according to claim 1 or 2, wherein the condition is satisfied.
Golf club set. A₁/ A_m= 1.02 to 1.50 A_m/ A_n= 1.02 to 1.50… B₁/ B_m= 0.70-0.98 B_m/ B_n= 0.70 to 0.98 ... 4. A long iron golf club having a loft angle of 27 ° or less, and a long iron golf club having a loft angle of 27 ° or less and 39 ° or less.
゜ Includes the following middle iron golf clubs and short iron golf clubs having a loft angle larger than 39 °, and long iron golf clubs having a depth of gravity A of 6.
5 to 10.0 mm and the height B of the center of gravity is 15.0 to 19.0 m
m, and the middle type iron golf club has a center of gravity depth A of 6.0 to 9.5 mm and a center of gravity height B of 16.0 to 20.0.
mm, and the short type iron golf club has a center of gravity depth A of 5.0 to 9.0 mm and a center of gravity height B of 17.0 to 2 mm.
The iron golf club set according to any one of claims 1 to 3, wherein the iron golf club set is 1.0 mm.