| 摘要 |
PURPOSE:To concentrate the force of a grip hand to one point by a projected body and to easily hit a ball by the reverse grip force by providing the projected body in a grip and fitting a weight part in an intermediate position between the projected body and a point on an effective hitting range. CONSTITUTION:A projected body 1 of a necessary shape is projectedly provided in the necessary position of one side surface side 4 in the grip parallel with a face surface. Then, in the length-wise direction of a tennis racket, a weight part 2 is provided in the intermediate position on a shaft 8 between the projected body 1 and the arbitrary position of an effective hitting range 3 on the face. By the operation of the projected body, the force to be added to the grip is concentrated to the position of the projected body 1 in the grip or to the position on the back and a rate is reduced to hit the ball by moment. On the other hand, the position of the weight part 2 plays the role of a shaft for spin of the tennis racket by the inertia of the weight part 2 and the reverse grip force goes to be the force to generate the spin with the position of the weight part 2 as the shaft. In impact, the reaction received in a head part by the ball is operated in a direction to stop the spin. Then, the reverse grip force transmits the force to the head part with resisting against this reaction. |
