| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the feel of ball striking without ill effects on the flight distance or direction of the ball by reducing the thickness of the ball hitting section to a specified value by forming a recess in the rear side of the metal- made heat main body and attaching a specified thickness of fiber-reinforced stiffener to the rear side of the said ball-hitting section. SOLUTION: A club 10 is described, designed for a No.7 iron. A head main body 11 is fabricated of a metal, such as stainless steel or carbon steel. A cavity 13 is formed in the rear side of the head main body 11, and a ball-hitting section 12 has a thickness W2 of 0.5-2mm. A fiber-reinforced stiffener 14 with its thickness W4 6-10mm is attached to the rear side of the ball-hitting section 12 for reinforcement. The fiber-reinforced stiffener 14 is a multilayer structure of reinforcing fibers, such as carbon fiber and carbide fiber, impregnated with an epoxy resin or an unsaturated polyester, and is bonded hardened or semi- hardened to the inner wall of the cavity 13.</p> |
