JPH04364869A - Golf club set - Google Patents

Abstract

PURPOSE:To provide a golf club set by which even a player slow in head speed can drive a ball sufficiently high to increase the carry. CONSTITUTION:A golf club set of a plurality of golf clubs have loft angles betawithin the range up to 35 deg.. The face surface 2 of the head 1 is constituted to gradually increase from the head having the small loft angle beta such that an angle (b) of a top edge 3 when viewed from the normal direction does not exceed the maximum 20 deg..

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club set, and more particularly to a combination of a plurality of clubs called iron clubs.

0002

BACKGROUND OF THE INVENTION Current golf clubs have been developed over hundreds of years of selection, and the rationality of their shape and function is being scientifically proven. In particular, the matching of more than 10 clubs in a golf club set exquisitely provides the flight and directional functions required for golf play. However, the rationality of this club set matching is reasonable for professional golfers with high head speeds and advanced male players, but it is not necessarily reasonable for women and the elderly. The biggest problem is that, as shown in Figure 5, the flight of clubs with low loft angles called long irons is difficult for women and the elderly, and as has been discussed and many improvements have been made. This is due to the fact that they do not fly like advanced players. In general, the ball will fly farther as the loft angle decreases, but this does not mean that the ball will fly farther as the loft angle decreases; there is a loft angle at which the ball will fly best depending on the head speed. In general,
The faster the club head speed, the farther the ball will fly with a smaller loft angle, and the slower the club head speed, the farther the ball will fly with a smaller loft angle. This is called the loft limit, and the loft angle of a club called a long iron is
This corresponds to the loft limit for the average amateur. Furthermore, for women and the elderly, the loft limit is larger, making ordinary long irons practically useless. The reason why the loft limit occurs is that people with slow head speeds also have slow ball speeds.
In addition, the amount of spin is small, so the ball does not fly high enough. Therefore, many attempts have been made to raise the ball, such as those described below, but each has its own problems.

[0003] Therefore, without changing the head shape of the conventional iron club, that is, with the head shape having the top edge angle within the range of 20 to 25 degrees when viewed from the normal direction of the face surface of the head, the face A so-called cavity back club with a low center of gravity design, as shown in Figure 6, has been developed in which the flesh on the back side of the club face has been shaved off to add weight to the sole side. In addition, a club with a low-toe design has been developed, which changes the conventional head shape and lowers the toe side of the head. This set of clubs with a low toe design had a low toe design from the long irons to the short irons, allowing players to fully experience a lower center of gravity compared to cavity back irons.

0004

[Problem to be solved by the invention] If the center of gravity is lowered while maintaining the traditional face shape without increasing the weight of the head, it is difficult to lower the center of gravity sufficiently, and the amount of decrease in the center of gravity is negligible. Ta. Therefore, it was not possible to raise the ball sufficiently with a low center of gravity to the extent that people with slow club head speeds could fully experience it.

[0005] In addition, clubs with a low toe design that allow even people with slow head speeds to raise the ball sufficiently, such as short irons, have a low toe design, and the ball can go up too high and the flight distance may decrease, so it is difficult to use as a golf club set. was difficult to use.

[0006] Therefore, the present invention aims to provide a golf club set that has a low center of gravity design that allows even people with slow club head speeds to raise the ball sufficiently, and that satisfies the functions of flight and direction as a golf club set. This is the purpose.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a first invention is a set of a plurality of golf clubs having a loft angle of up to 35°, and the normal to the face surface of the head The angle of the top edge when viewed from the direction is up to 20°
The loft angle is gradually increased starting from the smallest head so that the loft angle does not exceed . A second invention provides a top edge angle of a golf club having a loft angle of 35° or more, wherein the top edge angle of the golf club is approximately constant within a range not exceeding 20°, and the top edge angle of the golf club has a loft angle of 35° or more. is configured so that the angle is approximately constant within a range of 20° or more.

[0008]

[Operation] In the first invention, for example, the angle of the top edge of No. 3 to No. 6 irons is set to 10°, 13°, 15°, and 18°.
When, the height of the center of gravity is 18.7mm, 19.4mm,
They were 19.7 mm and 20.3 mm, and even those with slow club head speeds were able to sufficiently raise the ball, the flight distance increased, and the direction was good. In the second invention, for example, 3
~The center of gravity of the 6 iron is lower than that of the 7 and later irons, increasing flight distance even for people with slow head speeds, and making it easier to use as a set.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG.
The angle b is smaller than the angle b. In Figure 1, x axis, y
The axis is assumed to be a straight line passing through the center of gravity G of the head 1 and parallel to the plane 5 and the face surface 2, with the sole 4 of the head 1 in contact with the plane 5 and set on the plane 5 at a predetermined lie angle α. This was then set as the x-axis. In addition, the center of gravity 1 of the head 1
A straight line passing through G, parallel to the face surface 2, and perpendicular to the x-axis was assumed to be the y-axis. Angles a and b are head 1
This is the angle between the tangent to the top surface of the toe 6 side and the top edge 3 when the tangent line is parallel to the x-axis. In FIG. 2, the z-axis is assumed to be a straight line that is perpendicular to the x-axis and the y-axis and passes through the center of gravity G, and is defined as the z-axis. In contact with toe 6 of head 1 and y
Assuming a straight line c parallel to the axis on the xy plane, the distance from the intersection p of this straight line C and the x-axis to the center of gravity G is XG, and from the leading edge 7 of the sole 4 to the face surface 2 of the center of gravity G of the head 1. The distance to the orthogonal projection G' to the center of gravity YG
The distance from the center of gravity G to the orthogonal projection G' is the depth of the center of gravity Z
It was set as G. Furthermore, the distance from the plane 5 to the orthogonal projection G' is defined as the height of the center of gravity HG.

[0010] As for the conventional angle a of the top edge, for example, the following is known. 3 iron (3I)...20.0°
HG...21.0mm 4th iron (4
I)...20.3° HG...2
0.9mm 5th iron (5I)...20.2°
HG...20.7mm 6 iron (6I)...20.2° HG
...20.8mm 7 iron (7I)...
20.5° HG...20.8mm
8 iron (8I)...20.2°
HG...20.2mm 9 iron (9
I)...20.2° HG...2
0.0mm pitching wedge (PW)...20
．． 5° HG...20.0 mm For such a golf club set, in the embodiment of the first invention, the angle b was set as follows to lower the center of gravity height HG. 3I...10.0° HG...18.7mm4
I...13.0° HG...19.4mm5I
...15.0° HG ...19.7mm6I・
...18.0° HG ...20.3mm In the golf club set of the first invention, 7I or less may be the same as the conventional one, or the loft angle may be changed within the range of 20° or more of the top edge. It is also possible to gradually increase β starting from the head with the smallest value.

In the first invention, for a golf club set with a loft angle β of up to 35°, the top edge angle b is gradually increased from head 1 with a small loft angle β so as not to exceed a maximum of 20°. I let it happen. Further, particularly preferably, the weight of the cut top edge side (indicated by reference numeral 10 in FIG. 1) is added to the sole side of the head 1 in order to make the weight the same as that of a conventional head having an angle a of 20 to 25 degrees.

FIG. 3 is a graph showing the results of measuring the height of the center of gravity HG when the angle of the top edge of golf clubs 3I to 6I was changed without changing the weight, and it is clear from this graph that As shown, the smaller the angle of the top edge, the lower the height of the center of gravity HG.

FIG. 4 shows the results of measuring the center of gravity height HG of each golf club number when the top edge angle is a predetermined angle.

Further, in a set of a plurality of golf clubs having a loft angle β of 35° or more, the loft angle is set so that the angle b of the top edge viewed from the normal direction of the face surface 2 of the head 1 is within a range of 20° or more. It may be configured such that β gradually increases starting from the head with the smallest value. Particularly preferably, for a golf club whose angle b is smaller than the angle a of the top edge of a conventional golf club, weight is added to the sole 4 side of the head 1 so as not to change the weight, and the weight is the same as that of a conventional golf club. Make it. For example, 7I to PW are configured as follows. 7I...20.5° HG...20.8mm8
I...21.0° HG...20.4mm9I
...21.5° HG ...20.2mmPW・
・・22.0° HG ・・20.2mm

001
5] The second invention is configured as follows, for example. 3I...15.0° HG...20.1mm4
I...15.0° HG...19.9mm5I
...15.0° HG ...19.7mm6I・
・・15.0° HG ・・・19.9mm7I・・
・22.0° HG...21.0mm8I...
22.0° HG...20.6mm9I...2
2.0° HG...20.3mmPW...22
．． 0° HG...20.2mm In addition, the first and second
The invention can also be applied to a golf club set including a driving iron, and the head of the golf club set according to the invention may be cast or hollow. Furthermore, in the first invention where the loft angle is up to 35 degrees, if the face width of the head is narrowed or the neck is thinned, the height of the center of gravity can be further lowered. Also in the second invention, if the face width or neck of the head of a golf club with a loft angle of up to 35° is narrowed, the height of the center of gravity of the golf club within this range can be lowered. This makes it easier to use as a set.

[0016]

[Effects of the Invention] As explained above, according to the first invention, the height of the center of gravity is lowered, and even a person with a slow club head speed can sufficiently raise the ball, and the flight distance is increased. According to the second invention, the flying distance is increased and the usability as a set is also improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram seen from the face of an iron club.

[Fig. 2] A view from the toe side of the iron club.

FIG. 3 is a graph showing the results of measuring the height of the center of gravity when the angle of the top edge of golf clubs 3I to 6I was changed without changing the head weight.

FIG. 4 is a graph showing the results of measuring the height of the center of gravity of each golf club number when the top edge angle is a predetermined angle.

FIG. 5 is a graph comparing the flight distance of conventional iron clubs for each club size between professional/advanced golfers and female/elderly golfers.

FIG. 6 is a perspective view of an iron club called a cavity back.

[Explanation of symbols]

1 Head 2 Face surface 3 Top edge 4 Sole b Top edge angle β loft angle

Claims (2)

[Claims] Claim 1: A set of a plurality of golf clubs with a loft angle of up to 35 degrees, the loft being such that the angle of the top edge as viewed from the normal direction of the face surface of the head does not exceed a maximum of 20 degrees. A golf club set characterized in that the angle gradually increases from a small head. 2. The top edge angle of a golf club with a loft angle of up to 35° is substantially constant within a range not exceeding 20°, and the top edge angle of a golf club with a loft angle of 35° or more is A golf club set characterized in that the golf club is substantially constant within a range of 20 degrees or more.