| 摘要 |
PROBLEM TO BE SOLVED: To increase the speed of revolution of a struck ball.SOLUTION: The racket includes: a grip; an annular frame in which a plurality of through holes penetrating from the inner peripheral surface to the outer peripheral surface are provided; a shaft connecting the grip with the frame; and grommets which are fitted to the outer peripheral surface of the frame and which are composed of a plurality of cylinder parts to be each inserted into the plurality of through holes provided in the frame and base parts to connect the plurality of cylinder parts. The cylinder parts have a communication hole which communicates the base part side opening on the base part side with the tip end side opening on the side inserted into the through hole. Of the plurality of cylinder parts into which a string is inserted that is strung along the longitudinal direction of the racket, the tip end side opening of at least a part of the cylinder parts is wider than the base part side opening in the direction where the plurality of cylinder parts are arranged.SELECTED DRAWING: Figure 4 |
