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The STAIR-LIFT is intended to mechanically transport one person in a wheelchair or in a fold-down seat up and down stairs in a private or public facility either indoors or outdoors.

The STAIR-LIFT is an unenclosed inclined platform lift designed to carry a wheelchair and its occupant or a mobility-impaired person seated on a folding seat between floors in a public or private facility. There are currently three different models designed to address the nature of the stairway involved in its use. The GSL-1 model is designed for straight and turning stairways. It follows the inside radius of a stairwell. The GSL-2 model is designed strictly for straight stairways, and the GSL-3 model is designed for complex turning stairways that follow either the inside or outside radius of the stairwell. Each of the three models is accessible via one of three types of platform/ramp units. These platform/ramps are raised either manually or electrically. The GSL-1 and GSL-3 (turning) models use two parallel steel tubes, custom built for the stairway, to support their platforms. The tubes contain a continuous loop of wire haul rope that attaches to the platform through a slot in the upper tube. An electrical motor at the top of the system turns a drive cog, which moves the wire haul rope, carrying the wheelchair platform up and down the stairway. Delrin spheres and knuckles are affixed to the rope to keep it in the center of the tubes. The GSL-2 (straight) model uses three square structural steel rails to support the platform. The top two rails contain a roller chain which is held in a continuous loop by aircraft cable. The chains are attached to the platform through a slot in the upper rail. The bottom rail guides the platform, while an electrical drive motor at the top of the system propels the chains.