JPH042677Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to an improvement of a golf iron club set, and particularly to an improvement of a groove formed in the club face of an iron club. [Prior art] The club face of a golf iron club is
In addition to providing a loft to impart backspin to the ball, there are many grooves that are parallel to the sole, and according to the rules of golf established by the Japan Golf Association, these grooves, especially in the impact area, are "A continuous straight groove of equal cross-section, with open edges on both sides, may be adopted. The width of the groove shall be approximately constant and shall not exceed 0.9 mm along its length. .The distance between adjacent edges shall be at least three times the width of the groove and not narrower than 1.9 mm.The depth of the groove shall be
Must not exceed 0.5 mm. ”. For this reason, conventional iron clubs used had triangular grooves with a V-shaped cross section with a groove angle of 90 degrees arranged side by side on the club face, but in recent years, clubs with opposing walls at almost right angles have been developed to facilitate backspin. Iron clubs are often used that have square grooves that stand up on the club face. [Problems to be solved by the invention] However, with iron clubs in which the above-mentioned square grooves are carved into the club face, the ball bites into the edges of the grooves well at the time of impact, and therefore backspin is easily applied. On the other hand, it has the problem of damaging the ball surface. This damage to the ball is caused by the edges of the grooves cutting the surface of the ball, and is especially true for No. 8 to No. 10 iron clubs with large lofts, pitching wedges, and sand wedges when the ball is impacted. Since the component force in the planar direction becomes large, the damage becomes large. In view of the above-mentioned problems, it is an object of the present invention to provide an iron club set with grooves that cause less damage to the ball surface and impart backspin to the ball as appropriate for each club. . [Means for Solving the Problems] In order to achieve the above object, the golf iron club set of the present invention consists of a plurality of iron clubs in which a plurality of linear grooves are carved in the club face substantially parallel to the sole. In the golf iron club set in which each of the iron clubs has a different loft, the cross-sectional shape of the plurality of linear grooves is an inverted isosceles trapezoid shape, and the club on the opposing wall of the plurality of linear grooves is The angle between the face and the perpendicular surface (hereinafter, this angle is also referred to as the opening angle of the opposing wall) was increased as the loft became larger. [Function] The golf iron club set with the above configuration has the following features:
The cross-sectional shape of the multiple linear grooves is an inverted isosceles trapezoid, and the opening angle of the opposing walls of the grooves increases as the loft increases. The edge angle of the groove becomes gentler in the order of higher force, pitching wedge, and sand wedge, which reduces the amount of biting into the ball surface, and eliminates cutting damage caused by the edge of the groove. In addition, in low-numbered iron clubs with relatively small lofts, the opening angle of the opposing walls of the groove is small, and the edge angle of the groove is close to a right angle, which prevents the ball from sliding toward the club face at the time of impact. , the impact force in the direction orthogonal to the club face and the component force in the direction of the club face corresponding to the loft of the club can be accurately transmitted. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a partially cutaway perspective view of the head of an iron club.The club head 1 is cast from soft iron and has a surface-ground finish, and has a neck 3 protruding from one side for connection and fixation with the shaft 2. A flat face 4 is formed on the front side, and a plurality of linear grooves 6 are carved in the face 4, which are approximately parallel to the sole 5. It is a groove with an inverted isosceles trapezoidal cross section that constitutes a corresponding cross-sectional shape. Therefore, the groove 6
The cross-sectional shape differs depending on the number of iron clubs having different lofts θ, pitching wedge clubs, and sand wedge clubs. Figure 2 is an enlarged sectional view of the club face.
The inverted isosceles trapezoidal groove 6 has an opening width W, a depth D, and an opposing wall 7.
The club has an opening angle α and a distance L between adjacent grooves 6, and each value is specified for each club as shown in Table 1.

[Effect of idea]

In the golf iron club set of the present invention, the cross-sectional shape of the plurality of linear grooves is an inverted isosceles trapezoid shape,
The opening angle of the opposing wall of the groove is increased as the loft increases, making it possible to accurately select the impact force, face direction component force, and back spin on the ball at impact, and also to increase the loft. In clubs with large grooves, the edge angle of the grooves becomes looser, which eliminates damage to the ball when hitting the ball, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the head of an iron club, and FIG. 2 is an enlarged sectional view of the club face. 1...Club head, 4...Face, 5...
Sole, 6... Groove, 7... Opposing wall, θ... Loft, α... Opening angle of opposing wall.

Claims (1)

[Scope of utility model registration request] A golf iron club set comprising a plurality of iron clubs in which a plurality of linear grooves substantially parallel to the sole are carved in the club face, and each of the iron clubs has a different loft. The cross-sectional shape is an inverted isosceles trapezoid shape, and the angle between the opposing walls of the plurality of linear grooves and the plane perpendicular to the club face increases as the loft increases. Golf iron club set.