Positive Drive - Spiral Conveyor A Positive Drive - spiral conveyor, also known as a spiral elevator or spiral lift, is a mechanical device used to transport materials or products vertically. It consists of a helical surface that rotates around a central axis, moving products upward or downward along the spiral. Spiral conveyors are used in a wide range of industries, including food processing, packaging, and material handling. Spiral conveyors are particularly useful in situations where there is limited space available. They can convey products from floor level to a mezzanine or from one mezzanine to another. They can also be used to transfer products between different levels of a multi-story building.