| 摘要 |
PURPOSE: A safety trampoline is provided to secure a more wide exercise space and prevent an accidental fall by setting inner and outer circular nets in a concentric circle shape, and to effectively absorb shock and give appropriate elastic force to the nets by installing plate springs under the nets. CONSTITUTION: A safety trampoline comprises an inner circular net, an outer circular net, a Z-shaped first plate spring, and a Z-shaped second plate spring. The inner net made of elastic synthetic threads provides a repetitive jumping exercise. The outer net made of nylon is formed in concentric circle shape around the inner net to prevent an accidental fall. The first plate spring comprises a vertical part downward installed along the circumference of the outer net, and a horizontal part turned at a right angle from a region adjacent to the ground. The one end of the second plate spring is vertically connected to a connection point between the inner net and the outer net, and the other end of the second plate is riveted to the horizontal part of the first plate spring. Many first plate springs and second plate springs are arranged in a concentric circle shape under the inner net and the outer net.
|
