JP3170675B2 - Golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head, and more particularly, to a structure for arranging a marking having a concave cross section formed on a face surface of a wood golf club head.

[0002]

2. Description of the Related Art Generally, score lines (linear grooves) and dimples (spherical depressions) are formed on the face surface of iron golf club heads and wood golf club heads.
Are formed at predetermined intervals in parallel with the installation surface. The purpose of such marking is mainly to obtain a spin amount (coefficient of friction) with a golf ball and to efficiently remove drainage in muddy weather and mud and dirt from the face surface. Except for iron golf club heads and wood golf club heads, they are generally formed on the face surface.

The face surface of a conventional wood golf club head is formed with a constant curvature about the center of the face surface as a fulcrum. A marking pattern (face pattern) formed on the face surface having this curvature is as follows. It is arranged substantially parallel to the installation surface of the club head body, substantially symmetrically up and down with respect to the horizontal direction of the face center, and regularly.

[0004]

However, if a golf ball is hit near the center of gravity of the club head near the head of the club head having such a conventional face pattern as described above, the face becomes a fulcrum at the center of the face. Since the ball is formed with a constant curvature, in addition to a high projecting angle, the spin amount is too large, and as a result, it is difficult for the ball to blow up and fly the ball far away.

Further, in order to solve the above-mentioned problems, a slick face having no marking on the face can be considered. However, when such a golf club is manufactured and tested, a hit occurs above the face in fine weather. At this time, the above-mentioned problem that the ball is blown up can be solved, but there is a problem that it becomes a drop ball when hit below the face surface in rainy weather, and the flight distance does not come out, so that it is difficult to link to practicality.

Conventional wood golf club heads include, for example, Japanese Patent Application Laid-Open Nos. 5-237206 and
As disclosed in Japanese Patent Application Laid-Open No. 2-146774, even if the ball is hit at a position deviating from the sweet spot on the face, a trajectory with good directionality is obtained, and the aim is to extend the flight distance. The central area of the and the outer area and the coefficient of friction was changed by shot blasting, or as an iron golf club head,
As disclosed in JP-A-59-164076, by eliminating the face line at least near the center of the face surface, the golf ball is hardly damaged, and the backspin amount of the golf ball is almost reduced. There has been proposed a device which does not lose its usability as before without reducing it.

The present invention has been proposed in view of such a conventional problem. The present invention prevents the ball from blowing up in fine weather conditions and reduces the flight distance even in rainy conditions or mis-shots. It is an object of the present invention to provide a golf club head that can extend a flight distance using a golf club with total peace of mind.

[0008]

According to the present invention, in order to achieve the above object, a face surface of a club head is formed so as to have a constant curvature in a vertical direction, and the face surface is substantially the same as a mounting surface of the club head. In a wood golf club head in which concave markings are formed at predetermined intervals in parallel, the groove width of the markings is adjusted from the lower part of the face surface.
The gist of the invention is that it is formed so as to gradually narrow toward the upper part .

[0009]

[0010] The present invention is configured as described above, wherein the groove width of the marking formed on the face surface of the club head is continuously changed from the lower portion to the upper portion of the face surface, whereby the ball is formed. A sudden change in the flight distance due to a change in the hit position can be suppressed, the blow-up ball when hitting the golf ball near the upper part from the center of the face surface is eliminated, and it can be used for rainy conditions and miss shots. Can also increase the total flight distance.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a face surface of a club head of a wood golf club embodying the present invention. A plurality of score lines are provided on a face surface 2 of the club head 1 substantially in parallel with an installation surface of the club head 1. 3
A concave marking 3 made of a is formed.

The marking 3 is formed such that the groove width S is gradually reduced from the lower portion 2a of the face surface 2 to the upper portion 2b.

In the above embodiment of the present invention, the groove width of the marking 3 formed on the face surface 2 of the club head 1
By configuring S to continuously change from the lower portion 2a to the upper portion 2b of the face surface 2, a sudden change in flight distance due to a change in the hit position of the ball can be suppressed, and the center of the face surface 2 can be suppressed. This eliminates the blow-up ball when hitting a golf ball in the vicinity from above, and can totally increase the flight distance even under rainy conditions or missed shots.

Next, a club head 1 according to the present invention will be described.
When a conventional club head 1a marking 3 shown in FIG. 3 is a vertically symmetrical face pattern, and a club head 1b of slick face pattern not form any markings 3 on the face 2, further illustrated in FIG. 4, FIG. 2 The result of a test on the difference in flight distance when the ball is hit at hit points 1 to 7 will be described. [Test conditions] Golf club: A metal wood of # 1 (# 1) having a shaft length of 44 inches and a loft angle of 11 ° was used.

Head speed: 40 m / sec Golf ball: two-piece ball used The hitting position shown in FIG.
A total of 7 dots were tested in mm steps. FIG. 5 shows the relationship between the hit position and the flight distance in wet weather (WET) using the above three types of golf clubs.
Club head 1 having a slick face pattern shown by a broken line
In the case of b, the flight distance does not appear at hit point 1 at all, but the flight distance tends to sharply increase from hit point 4.

Further, in the conventional club head 1a which is an up-and-down target face pattern, a certain flight distance can be extended from the hit point position 1 to the hit point position 4; I can't stretch it. On the other hand, in the case of the club head 1 according to the present invention, the flight distance can be extended to some extent from the hit point position 1 to the hit point position 4, and the flight distance can be extended from the hit point position 4 to the hit point position 7. Can be done, and there is no sudden change in flight distance even at the face center,
This makes it possible to extend the flight distance in total even in rainy conditions and miss shots .

FIG. 6 shows the relationship between the hitting position and the flight distance in fine weather (DRY) using the above three types of golf clubs. Although not so much, the club head 1b of the slick face pattern shown by the broken line has no flight distance at the hit point position 1, but the club head 1 according to the present invention and the conventional club head 1b which is a vertically symmetric face pattern
Thus, the blow-up ball when hitting a golf ball near the upper portion from the center of the face is eliminated, and the flight distance does not change abruptly, so that the flight distance can be extended totally.

[0018]

[0019]

According to the present invention, as described above, the groove width of the marking formed on the face surface of the club head is configured to be continuously changed from the lower portion to the upper portion of the face surface, so that the fine weather condition is improved. In the conditions, it prevents the ball from blowing up, and it is possible to extend the flight distance using a golf club with total peace of mind without reducing the flight distance even in rainy conditions or mistaken shots, by configuring the groove width of the marking to be formed on the face from the bottom of the face surface to continuously vary toward the top, it is possible to suppress sudden changes in distance due to a change in the hit position of the ball effective.

[Brief description of the drawings]

FIG. 1 is a front view of a face surface of a wood golf club head embodying the present invention.

FIG. 2 is an explanatory diagram of a hitting position of a club head when a flight distance between a club head according to the present invention and a conventional club head is tested.

FIG. 3 is a front view of a club head in which a conventional marking has a vertically symmetric face pattern.

FIG. 4 is a front view of a conventional slick face pattern club head in which no marking is formed on the face surface.

FIG. 5 is an explanatory diagram of a graph in a case where a relationship between a hitting position and a flight distance in wet weather (WET) is performed using three types of golf clubs.

FIG. 6 is an explanatory diagram of a graph in a case where a relationship between a hit point position and a flight distance in fine weather (DRY) is performed using three types of golf clubs.

[Explanation of symbols]

Reference Signs List 1 club head 2 face surface 3 marking 3a score line S marking groove width

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 53/04

Claims (1)

(57) [Claims] 1. A face face of a club head is formed so as to have a constant curvature in the vertical direction, and concave markings are formed on the face face substantially in parallel with an installation face of the club head at predetermined intervals. In the wood golf club head, the groove width of the marking is from the lower portion of the face surface.
A golf club head formed so as to gradually narrow toward an upper part .