| 摘要 |
<p>Landing mats (1; 50; 60; 80; 150) for absorbing impact forces in gymnastics, and crash and emergency situations, involve a deformable force-distributing platform (2; 54; 66; 86, 90; 152) that is backed by an array of compressible gas-springs (3; 51; 61; 83, 87; 155) each comprising a compressible resilient body containing gas and coupled individually to a common gas manifold (5; 40; 85, 89; 159). Compression of one or more of the gas-springs by impact on the platform causes outflow of gas from them into the manifold at a faster rate than the consequential backflow into them from the manifold, orifices (21; 45; 162) for backflow being smaller than the orifices (9; 44; 160) of flap-valves (8; 47; 94; 161) controlling outflow into the manifold. The force-distributing platform may be of foam material, or comprise inflatable containers (153), and the gas-springs may be air pockets defined by elements (4; 51) of foam material within a sealed envelope.</p> |
