| 摘要 |
<p>According to the invention, training aid for guiding both arm and hand's joint in two most basic strokes played in tennis - forehand and backhand, is intended for practicing of movements and positioning of arm and hand's joint without utilization of racquet. It consists of two spherical mounts (1,2) with built in sliders (4,7) along which palm of the hand slides in order to practice movements for forehand swing and forehand swing out, and it also consists of one spherical mount (10) with slider (11) for backhand stroke. The position and height of the sliders are explicitly defined by the geometric relationships and by the magnitude of angles between each one of them and also against the hollow side of the mount (1, 2, 10). It is made with various radiuses (R) depending on the arm length, while the height regulation is achieved via self-adjustable pedestal-base depending on the height of the user.</p> |
