How does a construction hoist work?

A construction hoist is a lifting system often used at construction sites to lift personnel and materials to upper levels of unfinished buildings (also called Construction Material Hoist). The passenger hoist consists of a cage (or two) in which people will stand during transport, and a track that is mounted to the building. The cage will travel along this track by means of a rack and pinion drive system, and the cage can be stopped at various locations along the track. This allows people to load or unload at any floor along the length of the track.