| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tool that improves swing efficiency by freely setting control for guiding to best swing and by effectively and efficiently assisting improvement of a user's swing.SOLUTION: The tool includes: a plurality of coils K that are serially arranged around a cavity S provided in the inner tip end part of a device body 1 and that generate ability of an electromagnet by making an electric current flow; a power source V installed in the inner rear end part of the device body 1 for the purpose of supplying the electric current to the coils K; a switch SW that is arranged in the end face of a grip 2 of the device body 1 so that the current passage from the power source V to the coils K is turned on/off; a magnet M that also serves as a weight slightly smaller than the inner diameter of the coils K so as to be able to freely reciprocate in the inner space of the cavity S; and a current control device 5 that is capable of controlling the current flowing in the coils K so that an attracting force and a repulsive force are controlled of the magnet M moving in the cavity S by the electromagnet by the coils K at the time of a practice swing.</p> |
