| 摘要 |
<p>PURPOSE: To assist to develop a good batting form by connecting in a freely movable manner the end of a second string, the forward movement of a user's waist, so as not to be much disturbed, to a first string with both ends thereof connected to the user's waist. CONSTITUTION: A belt 19 connected by means of rings 21 and 22 to both ends 15 and 17 of a first string 12 is put on the waist 16, 18 of a user 11 so that the end 15 of the first spring 12 is positioned at the first waist 16 and the end 17 is positioned at the second waist 18. To this first string 12, an end 23 of a second string 13 fastened to a support 14, is connected to the first string 12 to allow free movement by way of a pulley 25. Accordingly when the user 11 makes a batting motion causing a forward movement of the waist 16, the pulley 25 moves toward the end 17 along the first string 12 without disturbing the forward motion of the waist 16. Thus, without disturbing the forward motion of the waist of the user, the device can assist in developing a good batting form.</p> |
