| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve impact absorption at the impact of a ball and to obtain a soft hitting feel by providing the hitting surface part of a metallic head of a golf putter with ribs long toward the rear surface part longitudinally in its central part and forming plural ribs gradually shorter toward both ends of the hitting surface part. SOLUTION: This plural ribs 8 are formed in the longitudinal direction (from the upper part to the bottom part of the head) by grooving or forging toward the rear surface part 3b from the hitting surface part 3a of the putter head 3. These ribs 8 are penetrated from the upper part toward the bottom part of the head and their front parts are exposed to the hitting surface part 3a. On the other hand, the rear parts are formed to a shape not exposed to the rear surface part 3b. Also the plural ribs 8 are preferably formed gradually shorter toward both ends of the hitting surface part 3a and at this time, the maximum length (depth) 8d of the central rib 8m is formed to 40 to 100% of the width D between the hitting surface part 3a and the rear surface part 3b. The width of the respective ribs 8 is preferably formed to 3 to 6 mm.</p> |
