JPH0523154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the head of an iron golf club, and more particularly to an improvement in the face structure of the head.

[Conventional technology]

Generally, in an iron club, a hitting area (scoring area) is formed in the center of the face of the head, and a face line (groove) is provided within this area to improve contact with the ball.

[Problem to be solved by the invention]

When using the conventional iron club mentioned above, if you miss the sweet spot and hit the ball at a position closer to the toe, the rotation of the head will cause the ball to undergo slice spin, causing the ball to move far to the right from the target direction. It deviates and becomes a trajectory with poor direction. With iron clubs, the center of gravity of the head is closer to the face than with wood clubs, so the gear effect of the head on the ball is less.
Therefore, it is not possible to sufficiently reduce the slice spin due to the gear effect.

Furthermore, when the ball is hit at a position closer to the heel, as opposed to when the ball is hit at a position closer to the toe, foot spin is generated on the ball, causing the ball to deviate significantly to the left, resulting in a trajectory with poor directionality.

In view of the above problems, the present invention makes it possible to obtain a ball trajectory with good directionality and to extend flight distance even when the ball is hit at a position away from the sweet spot on the face surface. The purpose is to provide iron golf club heads.

[Means to solve the problem]

According to the present invention, the above-mentioned problem is solved by shot blasting the face surface so that the friction coefficient of the area closer to the toe and the area closer to the heel of the face surface is larger than the friction coefficient of the intermediate area between the toe and the heel. A treated iron club head solves this problem.

[Effect]

According to the above means according to the present invention, it is possible to adjust the side spin by the difference in the local coefficient of friction on the face surface, so it is possible to obtain a desired ball trajectory, and to adjust the direction of the flight of the ball. This will improve flight distance.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the invention. In this embodiment, the face surface 21 of the iron club head 20 consists of a region 22 near the toe 25, a region 24 near the heel 26, and an intermediate region 23 between the toe and heel, and each region extends from the sole 27. It extends to the blade 28. Each region is subjected to a shot blasting treatment, but due to differences in treatment conditions, the toe-side region 22 and heel-side region 24 have a larger coefficient of friction than the intermediate region 23.

In this example, the ball is placed in the area 2 near the toe.
If the ball is hit in the area 2 or the area 24 near the heel, the necessary side spin will be applied to each area, so a trajectory with good directionality of the ball flight will be obtained.

〔Effect of the invention〕

As described above, according to the present invention, when a ball is hit with the toe or heel portion, the unevenness of the face surface bites into the ball, and when the head rotates around the center of gravity, the coefficient of friction on the toe and heel sides of the face surface is large. As a result, a strong gear effect momentarily occurs between the ball and the face, causing large side spin on the ball. This improves the directionality of the ball and eliminates the reduction in flight distance.

Furthermore, if we adopt a conventional method of changing the coefficient of friction by changing the spacing between the grooves on the face, the spacing between the grooves will change in both the toe and heel areas and the intermediate area of the face. As a result, the grooves on the face surface do not line up in a straight line from the toe to the heel, and the grooves on the face surface appear uneven at address, making it difficult to hold the club accurately. However, in the present invention, shot blasting is used, Since the roughness and depth of the granular depressions are changed, the coefficient of friction can be changed regardless of the grooves on the face surface, making it possible to accurately hold the club at address.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the invention. 20...Head, 21...Face surface, 22...
...Toe-side area, 23...middle area, 24...heel-side area.

Claims (1)

[Claims] 1. The face surface is shot-blasted so that the friction coefficients of the toe-side region and heel-side region of the face surface are larger than the friction coefficient of the intermediate region between the toe and heel. Iron club head.