framed panel 1 is subjected to shock such as a gust of strong wind or an explosion the panel 2 starts to move away from the frame 3 the shock cord arrests the movement of the panel 2 and prevents it from travelling at high speed into the interior of the room in which it is located although in extreme cases the panel 2 may fall into the interior of the room it is likely to fall close to the frame 3 and not travel across the room the shock cord 4 also stretches and absorbs a significant portion of the energy of the explosion or gust of wind thus reducing the load on the frame 2 in the event that the shock cord 4 is forced out of the cleats 6 a and 6 b the damage caused by the shock cord will be minimal in comparison to the damage that would be caused if a steel bar were to be used a number of different cleats can be used to hold the shock cord 4 but the u201c cl255 omega u201d cleat manufactured by clamcleats limited of watchmead welwyn garden city hertfordshire al7 1ap england and coverd by uk pat no 2 299 366 is particularly suitable this type of cleat wedges the shock cord 4 in a groove however alternative types of cleat such as t shaped cleats in which the shock cord 4 is wound around the cleat would also be suitable the shock cord 4 is a braided polyester nylon interlayer with a woven polyester shield however any other suitable shock cord such as an elasticated rubber bungee shock cord may be used suitable shock cords generally have a maximum elasticity of 10 however it has been found that shock cords having higher.