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Springfree Trampoline is a global company that manufactures recreational trampoline products and accessories. The unique Springfree design was invented by Dr. Keith Vivian Alexander, an associate professor in the Mechanical Engineering Department at the University of Canterbury in Christchurch, New Zealand.〔http://www.mech.canterbury.ac.nz/people/alexander.shtml Associate Professor Keith Alexander - University of Canterbury〕 ==History== After careful analysis of worldwide trampoline data in 1992 this initiated Dr Keith Vivian Alexander of Canterbury University, Christchurch, New Zealand he revealed that there were 3 major impact zones to a traditional trampoline designed by George Nissen in the 1930s; these impact zones would need to be engineered out in order to build the safest trampoline: #The Springs - on the jumping surface #The Steel Frame - on the jumping surface/ jumpers may fall and injure themselves #The Ground or obstructions on the ground - jumpers would hit as a result of falling off In 1999, he released his first prototype utilizing glass-reinforced plastic rods, with the first commercial versions began selling in late 2004. In 2009, the Springfree Trampoline won an Australian Design Award.〔http://www.designawards.com.au/application_detail.jsp?status=8&applicationID=4392&year=2009〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Springfree Trampoline」の詳細全文を読む スポンサード リンク
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