| 摘要 |
A metal wood type golf club head has a substantially hollow metallic body defining a bottom sole extending between a toe and heel, a top wall or crown, a ball striking face having parallel horizontal grooves, and a hosel formed at the heel to receive a shaft. The interior of the hollow body is filled with a foam material. The weight of the metallic body is distributed to establish an optimum impact point or sweet spot at substantially the geometric center of the ball striking face, and further establishes a plurality of substantially elliptical force lines on the face concentric with the sweet spot. Each elliptical force line represents a locus of points operative to impart substantially equal impact forces to a ball struck at a point on the corresponding elliptical force line, the major axis of the concentric elliptical force lines passing generally through the sweet spot substantially parallel to the grooves. Golf club heads in accordance with the present invention effectively provide larger sweet spots on the hitting faces of the heads so as to produce results from off-center shots that more closely approach the results produced when balls are struck at the sweet spot on the club head face.
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