Springfree Trampoline

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.
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 tradition 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...