Evacuation carriers should be part of your evacuation plan when it is unsafe to use an elevator or wheelchair lift. They are designed to quickly and easily evacuate someone with a mobility-related disability from upstairs to the ground level. Here is a compilation of evacuation carrier images.
A system of cables and stacked weights that provide a counterweight to the cab and passenger load weight. It's purpose is to make lifting the load more efficient and less taxing on the lifting motor.