How do stair lift devices work?
Primarily, there are four kinds of stairway chair lift drives that are available in the market these days: rack and pinion drives; screw or worm; chain; and cable. Amongst these, the type that is used most widely in homes is the rack and pinion drive. While in some models of stair chair lifts the gear rack is visible, generally situated at the center of the track, however, the more popular models are the ones that have the gear rack hidden. Most manufacturers of stairway chair lifts usually make them with aluminum; however, curved stair chair lifts are made with a combination of aluminum and steel. When stairway chair lifts were first introduced, they were powered by electricity. However, these had problems inherent in them, since they required to be plugged in directly into the AC mains with a cable. Apart from the potential hazard that the trailing cable posed, since it used an AC powered motor, it was prone to stopping and starting motions. Batteries were not in use those days since
