| 摘要 |
PURPOSE: A safe trampoline using cylindrical shaped coil springs is provided to improve restoring force of the trampoline and thus, to increase the jumping effects of the trampoline. CONSTITUTION: The safe trampoline using cylindrical shaped coil springs includes an inner jumping net (mat) and an external safe net (mat), which form a concentric circle. Therefore, this double net (mat) prevents a user from falling out of the trampoline. Also, the cylindrical shaped coil springs are securely connected in the vertical direction to the circumference of the concentric circle. When the user jumps on the trampoline, the coil springs receive elasticity from the load of the user and enables the user to jump even higher next time.
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