| 摘要 |
PROBLEM TO BE SOLVED: To provide sporting goods of a high degree by adding a device utilizing the force of a spring to the conventional board for game and adding an advance force by vertical movement of a user's weight by the inertia force of this device alone. SOLUTION: By attaching a planar spring into the board, since the utilization of the vertical movement of the board is made possible, the board is usable even for ordinary children as the board for game. Since the intensity of the force can be variably increased or decreased by offsetting the position of bolts 4, the extremely easily usable sporting goods are obtained.
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