JPH07328149A - Iron club set - Google Patents

Abstract

PURPOSE:To prevent the directional deviation of a flying ball resulting from the difference of lie, by reducing the face progression of clubhead as the lie of clubhead becomes smaller. CONSTITUTION:In an iron club set designed to have at least two or more kinds in the lie within the same model, when clubs of the same number in respective sets with different lies are compared with each other, the face progression of the head 1 is reduced as the lie theta of club becomes smaller. When the lie theta1-theta3 of head 1 of No.3 iron for instance in the above club sets are designed as theta1>theta2>theta3, the relation of the face progression D1-D3 of respective heads 1 is designed as D1>D2>D3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf iron club set in which a plurality of irons having different iron numbers are combined.

[0002]

2. Description of the Related Art A golf iron club set generally has a structure in which seven iron clubs, numbered 3 to 9, and a pitching wedge club and a sand wedge club are combined.

As such an iron club set, various models having different club head designs and the like are generally provided. Even in the same model, the lie angle of the club head is the swing of the player. In order to match the plane, some club heads have different variations in the lie angle of the same count club head.

For example, in many iron club sets of the same model, the lie angle of the club head for each set is often set to upright, standard, or flat. In this case, with the lie angle of the standard set as the reference, the lie angle that is larger than the lie angle by 2 degrees is the upright, and conversely, the lie angle that is smaller by 2 degrees is the flat.

Conventionally, only the lie angle is changed, and other standards of the club head, that is, the face progression, the depth of the center of gravity, the angle of the center of gravity, and the like, are common to each set. An example is shown in Table 1 below. The unit of the lie angle and the angle of the center of gravity in the table is °, and the unit of the face progression and the depth of the center of gravity is mm.

[0006]

[Table 1]

[0007]

Assembling iron club sets having different lie angles using the above-described standard club heads (upright type, standard type, and flat type) (shaft length, The natural frequency, balance, weight, etc. of the club are the same.) As a result of performing a test hit test by the player and the robot machine (the lie angle is adjusted to each lie angle, the head speed is the same speed, the ball used is the same), The lie angle ones flew relatively straight to the target direction regardless of the number of clubs used, whereas the upright lie angle ones flew a little to the left and went flat. Those with a lie angle fly slightly to the right,
It became a ball muscle.

As can be seen from these results, in an iron club set using a club head in which only the lie angle is changed and the other standards are the same, even if the ball is caught by a swing plane suitable for the lie angle, The more upright the angle, the easier it is for the head to return, and the ball flies to the left.The flatter the lie angle, the more difficult the head to return, the ball flies to the right, and the direction in which the ball flies. There will be problems.

The present invention has been made paying attention to such a point, and an object of the present invention is to set any lie angle by preventing deviation of the direction of flight of a ball due to difference in lie angle. Even if you use the set club
An object is to provide an iron club set that can stabilize the direction of flight of a ball.

[0010]

FIG. 4 shows the structure of a club head. FIG. 4A is a front view of the head 1, and FIG.
FIG. 3 is a bottom view of the head 1. In the figure, S is the axis of the shaft 2, L is the leading edge located at the lowest point of the face 1a of the head 1, G is the center of gravity of the head 1, and T is the sole thickness of the head 1.

As shown in (a), the angle between the ground a and the shaft 2 when the sole of the head 1 is attached to the ground a and correctly addressed is the lie angle θ. Further, as shown in (b), the distance from the axis S of the shaft 2 to the leading edge L is the face progression D, and the distance from the axis S of the shaft 2 to the center of gravity G is the center of gravity depth d.

On the other hand, as shown in FIG. 5, when the shaft 2 of the club is placed on a horizontal base b and the head 1 is projected from the edge of the base b to hold the club horizontally, the center of gravity G of the head 1 is set. So that it is located directly below the axis S of the shaft 2,
The head 1 is stable and stationary, but the shaft 2 at this time
A vertical line A perpendicular to the axis S of the head 1 and the face surface 1a of the head 1
The angle formed by the extension line B along the longitudinal direction of is the center of gravity angle α.

Here, after various researches have been made, in order to prevent the deviation of the directionality of the flight of the ball due to the difference in the lie angle θ, the phasing angle corresponding to the difference in the lie angle θ is set.
It was revealed that it is important to change the sprogression and set the depth of center of gravity and the angle of center of gravity to the standard that suits each lie angle.

Therefore, according to the present invention, in an iron club set of the same model in which the lie angle setting is divided into at least two kinds, the clubs of the same count in the sets having different lie angle settings are set. When the comparison is made, the face progression of the head of the club becomes smaller from the club of the set having a larger lie angle setting to the club of the set having a smaller lie angle setting.

[0015]

When the face progression of the head is changed according to the setting of the lie angle, the depth of the center of gravity and the angle of the center of gravity of the head are changed in proportion to this. By changing the standard of the head according to the lie angle in this way, the deviation of the direction of flight of the ball due to the difference in the lie angle is reduced, and the direction of flight of the ball is stabilized.

[0016]

EXAMPLES An example of the present invention will be described below.
FIG. 1 shows a front view of the head of the third iron of the iron club set of the same model with different lie angle settings. The lie angle of the head in (a) is θ 1,
The lie angle of the head in (b) is set to θ2, and the lie angle of the head in (c) is set to θ3, and θ1>θ2> θ3.

That is, (a) is an upright head with a large lie angle, (b) is a standard head with a standard lie angle, and (c) is a flat head with a small lie angle.

FIG. 2 shows a side view of each of the heads. Here, the sole thicknesses T1, T2 and T3 of the heads (a), (b) and (c) are the same (T1 = T2 =
T3), the relationship between the face progression D1 of the head of (a), the face progression D2 of the head of (b), and the face progression D3 of the head of (c) is D1> D2.
It is set to> D3.

That is, the face progression is set to gradually decrease from an upright head having a large lie angle to a flat head having a small lie angle.

If there is such a relationship among the heads of (a), (b) and (c), the depth d of the center of gravity of the head of (a) will be described.
1 and the depth d2 of the center of gravity of the head in (b) and the depth d3 of the center of gravity of the head in (c) have a relationship of d1 <d2 <d3.

That is, the depth of the center of gravity gradually increases from an upright head having a large lie angle to a flat head having a small lie angle. FIG. 3 shows a bottom view of the head, in which (a) the center of gravity angle of the head is α 1, (b) the center of gravity angle of the head is α 2,
The center of gravity angle of the head in (c) is α3, and these center of gravity angles α1, α2, α3 are the depths of center of gravity d1, d2.
, D3 and the depth of the center of gravity of the head d1
, D2, d3 increase, the center of gravity angle α1
, Α2, α3 also gradually increase. That is, the center-of-gravity angle also gradually increases from a head with a large lie angle to a head with a small lie angle.

In this description, the third club of the iron club sets of the same model but different lie angle settings is compared as a representative.
Other clubs have the same relationship.

The following Tables 2 and 3 show examples of the difference in face progression for each count club in the iron club set in which the lie angle setting is divided into three types in the same model.

[0024]

[Table 2]

[0025]

[Table 3]

In the iron club set having the above-described structure, a club having a head with a large lie angle quickly passes through the head with respect to the position of the ball, making it difficult for the head to return. The passage of the head with respect to the position of the ball is delayed, and the head easily returns. For this reason, the directionality of the ball flight due to the difference in the lie angle, that is, the ball is less likely to swing in the left-right direction, and the directionality of the ball flight is stabilized.

[0027]

As described above, according to the present invention, the lie angle of the club of the same count for each set is changed, and the face progression is also changed correspondingly. Even when using a set club set to, there is an advantage that the deviation in the direction of flight of the ball due to the difference in the lie angle can be reduced and the ball can be accurately launched in the target direction.

[Brief description of drawings]

FIG. 1 is a front view of a club head showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 shows a general configuration of a club head, where (a) is a front view of the club head and (b) is a side view of the club head.

FIG. 5 is an explanatory perspective view of a center of gravity angle of a club head.

[Explanation of symbols]

 1… club head θ… lie angle D… face progression d… depth of center of gravity α… angle of center of gravity

Claims (1)

[Claims] 1. An iron club set having the same model and having lie angles set to at least two different types, when comparing clubs of the same count in sets having different lie angles. In addition, the iron club set is characterized in that the face progression of the head of the club becomes smaller as the club having the larger lie angle setting changes to the club having the smaller lie angle setting.