A compact screw drive stairlift has the drive screw retained in a cavity within the rail and engages drive transfer elements extending along an inner surface of the cavity. The combined configurations of the screw and the rail ensure that the stairlift carriage is retained on the rail.

A system includes an input/output (I/O) interface, a processor coupled to the I/O interface, and a memory accessible to the processor. The I/O interface may be configured to receive data from one or more sensors and to provide control signals to one or more actuators. The memory may store instructions that, when executed, cause the processor to receive sensor signals from the one or more sensors and send actuator signals to the one or more actuators to control movement of a plurality of discrete stair lifts of a staircase based on the received sensor signals.

A tower elevating assembly generally includes a platform assembly configured to move between a first elevation position and a second elevation position, a tower having a track assembly, wherein the track assembly includes first and second track portions, each being a single continuous structure, and a carriage assembly for providing support to the platform and moving within the track. A kit for a tower elevating assembly includes a platform assembly, a tower having a track assembly, and a carriage assembly configured for coupling with the platform assembly and the tower.

A tower elevating assembly generally includes a platform assembly configured to move between a first elevation position and a second elevation position, a tower having a track assembly, wherein the track assembly includes first and second track portions, each being a single continuous structure, and a carriage assembly for providing support to the platform and moving within the track. A kit for a tower elevating assembly includes a platform assembly, a tower having a track assembly, and a carriage assembly configured for coupling with the platform assembly and the tower.

A tower elevating assembly generally includes a platform assembly configured to move between a first elevation position and a second elevation position, a tower having a track assembly, wherein the track assembly includes first and second track portions, each being a single continuous structure, and a carriage assembly for providing support to the platform and moving within the track. A kit for a tower elevating assembly includes a platform assembly, a tower having a track assembly, and a carriage assembly configured for coupling with the platform assembly and the tower.

A lift assembly generally includes a platform assembly configured to move between a first elevation position and a second elevation position, a tower assembly having a track assembly, wherein the track assembly includes first and second track portions, each being a single continuous structure, and a carriage assembly for providing support to the platform and moving within the track. A kit for a lift assembly includes a platform assembly, a tower assembly having a track assembly, and a carriage assembly configured for coupling with the platform assembly and the tower assembly.

An apparatus that permits a wheelchair to traverse stairs. A carriage platform supporting the wheelchair is housed in an inclined ways assembly and moves by means of a rotated threaded rod supported in the ways and traveling nuts fixed to the carriage; a debarkation ramp hinged to the carriage, spans the distance and elevation difference between the carriage and the desired landing point.