| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a racket frame providing a high hitting angle and high initial velocity when a ball is hit. <P>SOLUTION: The tennis racket frame 1 is made of fiber-reinforced synthetic resin, and includes a face portion 2, a shaft portion 3 and a grip portion 4. When the deflection amount of the racket frame measured by fixing the proximal end of the grip portion and applying the load of 6 kg in the direction perpendicular to the face surface to the front end of the racket frame is X (mm) and the warping amount measured by applying the load of 100 kg in the direction perpendicular to the axis of the racket frame to the face portion is Y (mm), (X, Y) are present within a triangular region formed by connecting points A (8, 21.5), B (8, 13), and C (13, 21.5) on the X-Y coordinate surface. <P>COPYRIGHT: (C)2011,JPO&INPIT |
